Optical image capturing system

Abstract

The present invention provides an optical image capturing system, comprising: a first lens having positive refractive power, the object-side surface of the first lens being a convex surface, and the image-side surface of the first lens being a concave surface; a second lens having positive refractive power; a third lens having negative refractive power; the fourth lens has negative refractive power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens having positive refractive power; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens have positive refractive power, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially arranged from the object side, and the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are both Q-type aspheric surfaces.

Description

Technical Field

[0001] This invention relates to an optical imaging system. Background Technology

[0002] Lenses are an indispensable component for shooting and recording images in various portable devices. With the emergence of diverse application needs, lenses on portable devices are gradually moving towards multi-lens forms with different focal lengths, different field of view and different aperture sizes for specific purposes. The common three-lens setups are roughly divided as follows: (1) a large aperture main lens, (2) an ultra-wide-angle lens with a focal length half that of the main lens, and (3) a telephoto lens with a focal length more than twice that of the main lens.

[0003] Telephoto imaging is further divided into optical zoom and digital zoom. Compared to digital zoom, which achieves the telephoto effect by cropping and enlarging the image to reduce image quality, optical zoom physically changes the focal length of the lens by moving the lens group inside the lens. Whether zooming in or out, it can still maintain a clear image without compromising image quality.

[0004] However, with the increasing number of lenses and the pursuit of thinner and lighter devices, it is necessary to significantly reduce the space of the lens module. For optical zoom telephoto lens modules, longer focal lengths require longer lens lengths. Therefore, how to balance optical zoom characteristics, greater telephoto magnification, and effective utilization of limited module volume has become a problem that multi-lens modules must address in mobile devices. Summary of the Invention

[0005] This invention provides an optical imaging system, comprising: a first lens having positive refractive power, wherein the object-side surface of the first lens is convex and the image-side surface of the first lens is concave; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having negative refractive power, wherein the object-side surface of the fourth lens is concave and the image-side surface of the fourth lens is convex; a fifth lens having positive refractive power; and a sixth lens having positive refractive power, wherein the first, second, third, fourth, fifth, and sixth lenses are arranged sequentially from the object side, wherein the object-side surface and the image-side surface of each of the first to sixth lenses are Q-type aspherical surfaces.

[0006] Based on the above, the optical imaging system provided by this invention meets the manufacturing conditions for plastic injection molding and can change the focal length of the lens by moving the lens to achieve an optical zoom effect, i.e., the function of continuous optical zoom. Furthermore, the lenses in this optical imaging system are designed using Q-type aspherical surfaces, which not only eliminates aberrations but also reduces the number of lenses used, thus lowering the overall height of the optical imaging system. Attached Figure Description

[0007] The various aspects of the invention can be best understood from the following detailed description when read in conjunction with the accompanying drawings. It is worth noting that, in accordance with industry standard practice, the various features are not drawn to scale. In fact, for clarity of discussion, the dimensions of the various features may be increased or decreased arbitrarily.

[0008] Figures 1A to 1C This is a schematic diagram of the lens position and optical path of the optical imaging system according to the first embodiment of the present invention when the object distance is 200 mm, 600 mm and infinity respectively.

[0009] Figure 2A The MTF curves of the optical imaging system of the first embodiment of the present invention when the object distance is 200 mm and the normalized field of view is 0.0, 0.5, and 1.0.

[0010] Figure 2B The MTF curves of the optical imaging system of the first embodiment of the present invention when the object distance is 600 mm and the normalized field of view is 0.0, 0.5, and 1.0.

[0011] Figure 2C The MTF curves of the optical imaging system of the first embodiment of the present invention when the object distance is infinitely far and the normalized field of view is 0.0, 0.5, and 1.0.

[0012] Figures 3A to 3C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the first embodiment of the present invention when the object distance is 200 mm.

[0013] Figures 4A to 4C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the first embodiment of the present invention when focused at an object distance of 600 mm;

[0014] Figures 5A to 5C These are, respectively, the meridional field curvature, the sagittal field curvature, and the distortion of the optical imaging system of the first embodiment of the present invention when the object distance is infinite;

[0015] Figures 6A to 6C The optical imaging system of the first embodiment of the present invention focuses on the transverse chromatic aberration at object distances of 200 mm, 600 mm and infinity, respectively.

[0016] Figures 7A to 7C The optical imaging system of the first embodiment of the present invention focuses the principal ray angles at object distances of 200 mm, 600 mm and infinity, respectively.

[0017] Figures 8A to 8CThis is a schematic diagram of the lens position and optical path of the optical imaging system according to the second embodiment of the present invention when the object distance is 200 mm, 600 mm and infinity respectively.

[0018] Figure 9A The MTF curves of the optical imaging system of the second embodiment of the present invention are shown when the object distance is 200 mm and the normalized field of view is 0.0, 0.5, and 1.0.

[0019] Figure 9B The MTF curves of the optical imaging system of the second embodiment of the present invention when the object distance is 600 mm and the normalized field of view is 0.0, 0.5, and 1.0.

[0020] Figure 9C The MTF curves of the optical imaging system of the second embodiment of the present invention when the object distance is infinitely far and the normalized field of view is 0.0, 0.5, and 1.0.

[0021] Figures 10A to 10C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the second embodiment of the present invention when the object distance is 200 mm.

[0022] Figures 11A to 11C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the second embodiment of the present invention when focused at an object distance of 600 mm;

[0023] Figures 12A to 12C These are, respectively, the meridional field curvature, the sagittal field curvature, and the distortion of the optical imaging system of the second embodiment of the present invention when the object distance is infinite;

[0024] Figures 13A to 13C The optical imaging systems of the second embodiment of the present invention focus on the transverse chromatic aberration at object distances of 200 mm, 600 mm and infinity, respectively.

[0025] Figures 14A to 14C The optical imaging system of the second embodiment of the present invention focuses the principal ray angles at object distances of 200 mm, 600 mm and infinity, respectively.

[0026] Figures 15A to 15C This is a schematic diagram of the lens position and optical path of the optical imaging system according to the third embodiment of the present invention when the object distance is 200 mm, 600 mm and infinity respectively.

[0027] Figure 16A The MTF curves of the optical imaging system of the third embodiment of the present invention are shown when the object distance is 200 mm and the normalized field of view is 0.0, 0.5, and 1.0.

[0028] Figure 16B The MTF curves of the optical imaging system of the third embodiment of the present invention are shown when the object distance is 600 mm and the normalized field of view is 0.0, 0.5, and 1.0.

[0029] Figure 16C The MTF curves of the optical imaging system of the third embodiment of the present invention when the object distance is infinite and the normalized field of view is 0.0, 0.5, and 1.0.

[0030] Figures 17A to 17C These are, respectively, the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the third embodiment of the present invention when focusing on an object distance of 200 mm;

[0031] Figures 18A to 18C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the third embodiment of the present invention when focused at an object distance of 600 mm;

[0032] Figures 19A to 19C These are, respectively, the meridional field curvature, the sagittal field curvature, and the distortion of the optical imaging system of the third embodiment of the present invention when the object distance is infinite;

[0033] Figures 20A to 20C The optical imaging systems of the third embodiment of the present invention focus on the transverse chromatic aberration at object distances of 200 mm, 600 mm and infinity, respectively.

[0034] Figures 21A to 21C The optical imaging system of the third embodiment of the present invention focuses the principal ray angles at object distances of 200 mm, 600 mm and infinity, respectively.

[0035] Figure 22 This is a schematic diagram of the lens position and optical path of an optical imaging system according to the fourth embodiment of the present invention;

[0036] Figure 23 This is a schematic diagram of the lens position and optical path of an optical imaging system according to the fifth embodiment of the present invention;

[0037] Figure 24 This is a schematic diagram of the lens position and optical path of an optical imaging system according to the sixth embodiment of the present invention. Detailed Implementation

[0038] The following description provides detailed examples and accompanying drawings, but these examples are not intended to limit the scope of the invention. Furthermore, the component dimensions in the accompanying drawings are for illustrative purposes and do not represent actual component size proportions. Also, although terms such as "first" and "second" are used to describe different components and / or membranes, these components and / or membranes should not be limited by these terms. Rather, these terms are used only to distinguish one component or membrane from another. Therefore, the first component or membrane discussed below may be referred to as the second component or membrane without departing from the teachings of the embodiments. For ease of understanding, similar components will be labeled with the same symbols in the following description.

[0039] In the description of embodiments of the present invention, different examples may use repeated reference numerals and / or words. These repeated numerals or words are for simplification and clarity purposes and are not intended to limit the relationship between the various embodiments and / or appearance structures. Furthermore, if the following description of the invention describes forming a first feature on or above a second feature, it indicates that it includes embodiments where the formed first feature and the second feature are in direct contact, and also includes embodiments where an additional feature is formed between the first feature and the second feature, such that the first feature and the second feature may not be in direct contact. For ease of understanding, similar components will be referred to by the same symbols in the following description.

[0040] This invention provides a long focal length, variable focal length optical imaging system.

[0041] An optical imaging system according to an embodiment of the present invention includes six refractive lenses disposed on an optical axis, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed sequentially from the object side.

[0042] In this specification, the first lens refers to the lens closest to the object, and the sixth lens refers to the lens closest to the imaging plane.

[0043] In this specification, all units such as radius of curvature, thickness, TTL (distance from the object-side surface of the foremost prism to the imaging plane), focal length (f), and IMGH (half the length of the diagonal of the imaging plane) are expressed in millimeters (mm), while FOV (angle of view of the optical imaging system) is expressed in degrees (°).

[0044] Furthermore, in this specification, in the description of the shape of each lens, a convex shape on a surface may mean that the paraxial region of the surface (a very narrow region close to and including the optical axis) is convex, while a concave shape on a surface may mean that the paraxial region of the surface is concave. Therefore, even when a surface of a lens is described as having a convex shape, the paraxial region of the surface may be convex, while the edge portion of the lens may be concave. Similarly, even when a surface of a lens is described as having a concave shape, the paraxial region of the surface may be concave, while the edge portion of the lens may be convex.

[0045] In the optical imaging system of this invention, the object-side and image-side surfaces of the first to sixth lenses are all Q-type aspherical designs. Compared to spherical lenses, aspherical lenses not only eliminate aberrations but also reduce the number of lenses used, thus lowering the overall height of the optical imaging system. Each Q-type aspherical shape can be described by Q-type aspherical formula 1:

[0046]

[0047] In formula (1), z(r) represents the distance vector from the vertex of the aspherical surface to the coordinate point at a position with radius r, starting from the central optical axis. With the additional polynomial used to characterize the deviation between the aspherical surface and the reference quadratic surface Composition. Where c is the curvature and r is the radial coordinate. k is the conic coefficient, and u is the normalized radial coordinate. , The maximum value of the light-transmitting half-aperture, A m For each The coefficients of the additional polynomial, M represents the highest number of terms. In this design, the highest number of terms in the additional polynomial is M = 12, that is... to The additional polynomials are detailed in Table 1.

[0048] Table 1

[0049]

[0050] Compared to even-order aspherical surfaces, Q-type aspherical surfaces have the following advantages: (1) Even-order aspherical surfaces are non-orthogonal polynomials, and the surface is formed by the superposition of terms. Q-type aspherical surfaces are normalized orthogonal polynomials, and the coefficients of each term change independently and do not affect each other. (2) Q-type aspherical surfaces are faster to design and optimize, and are easier to converge to find the optimal surface shape. (3) Higher-order terms of even-order aspherical surfaces are prone to curvature abrupt changes; the slope of the surface shape of Q-type aspherical surfaces changes gently, reducing the difficulty of aspherical lens processing and measurement, and improving lens manufacturing yield.

[0051] The optical imaging system of the present invention utilizes a positive-negative lens architecture to reduce aberrations. To eliminate field curvature, the Petzval sum must be as small as possible, as shown in formula (2).

[0052] (2)

[0053] in For the first The refractive power of each lens, For the first The refractive index of each lens.

[0054] By combining lenses with both positive and negative refractive power, the refractive power can be... They cancel each other out. However, the sum of the refractive power of all lenses must be greater than zero to produce a positive focal length. Therefore, it is impossible to reduce the total refractive power of the Pittsvar lens by using only one material. Thus, at least two materials with different refractive indices (n) must be used in combination.

[0055] Second, in order to eliminate chromatic aberration, the smaller the sum of the refractive power of each lens divided by the Abbe number (υ) of the material, the better, as shown in formula (3).

[0056] (3)

[0057] Where Di is the refractive power of the i-th lens, and υi is the Abbe number of the i-th lens.

[0058] Similarly, using only one material, regardless of the number of lenses, makes it difficult to correct chromatic aberration. Due to material properties, a high refractive index results in a low Abbe number, making it mathematically difficult to simultaneously achieve zero field curvature and chromatic aberration. A balance can only be achieved by minimizing these two aspects, using different materials with varying refractive indices and thicknesses to correct the optical path length of each field of view and thus correct aberrations. Therefore, the refractive power of the first to sixth lenses in this optical imaging system is designed to satisfy a "positive-positive-negative-negative-positive-positive" structure. The refractive indices of the materials used for the second and third lenses are n2 and n3, respectively, and their Abbe numbers are υ2 and υ3, respectively. The refractive index and Abbe number characteristics of the selected materials satisfy: n3>n2, υ2>υ3.

[0059] An optical imaging system according to an embodiment of the present invention includes: a first lens having positive refractive power, wherein the object-side surface of the first lens is convex and the image-side surface of the first lens is concave; a second lens having positive refractive power; a third lens having negative refractive power; a fourth lens having negative refractive power, wherein the object-side surface of the fourth lens is concave and the image-side surface of the fourth lens is convex; a fifth lens having positive refractive power; and a sixth lens having positive refractive power. The first, second, third, fourth, fifth, and sixth lenses are arranged sequentially from the object side. The object-side and image-side surfaces of each of the first to sixth lenses are Q-type aspherical surfaces.

[0060] According to an embodiment of the present invention, the distance along the optical axis between the image-side surface of the third lens and the object-side surface of the fourth lens is variable. Specifically, the optical zoom effect is achieved by changing the air gap between the third and fourth lenses.

[0061] According to an embodiment of the present invention, the object-side surface of the second lens is convex, and the image-side surface of the second lens is convex; the object-side surface of the third lens is concave, and the image-side surface of the third lens is concave; the object-side surface of the fifth lens is convex, and the image-side surface of the fifth lens is convex; the object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is convex.

[0062] According to an embodiment of the present invention, the optical imaging system satisfies the following conditions: 13.1 mm ≤ R1+R2 ≤ 26.8 mm; -58.5 mm ≤ R3+R4 ≤ -31.5 mm; and -18.7 mm ≤ R5+R6 ≤ -6.5 mm. Wherein R1 is the radius of curvature of the object-side surface of the first lens, R2 is the radius of curvature of the image-side surface of the first lens, R3 is the radius of curvature of the object-side surface of the second lens, R4 is the radius of curvature of the image-side surface of the second lens, R5 is the radius of curvature of the object-side surface of the third lens, and R6 is the radius of curvature of the image-side surface of the third lens.

[0063] According to an embodiment of the present invention, the optical imaging system satisfies the following conditions: -73.7 mm ≤ R7 + R8 ≤ -43.2 mm; -2.6 mm ≤ R9 + R10 ≤ 19.4 mm; and -8.7 mm ≤ R11 + R12 ≤ 5.6 mm. Wherein R7 is the radius of curvature of the object-side surface of the fourth lens, R8 is the radius of curvature of the image-side surface of the fourth lens, R9 is the radius of curvature of the object-side surface of the fifth lens, R10 is the radius of curvature of the image-side surface of the fifth lens, R11 is the radius of curvature of the object-side surface of the sixth lens, and R12 is the radius of curvature of the image-side surface of the sixth lens.

[0064] According to an embodiment of the present invention, the optical imaging system satisfies the following conditions: 26.0 mm ≤ f1 + f2 ≤ 31.0 mm; -15.0 mm ≤ f3 + f4 ≤ -12.0 mm; and 22.0 mm ≤ f5 + f6 ≤ 27.0 mm. Wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

[0065] According to an embodiment of the present invention, the optical imaging system satisfies the following conditions: n2 < n3, and υ3 < υ2, where n2 is the refractive index of the second lens and n3 is the refractive index of the third lens. The Abbe number of the second lens. Let be the Abbe number of the third lens.

[0066] According to an embodiment of the present invention, the optical imaging system satisfies the following conditions: n5 < n4, and υ4 < υ5. Wherein n4 is the refractive index of the fourth lens, and n5 is the refractive index of the fifth lens. The Abbe number of the fourth lens. Let be the Abbe number of the fifth lens.

[0067] According to an embodiment of the present invention, the optical imaging system satisfies the following condition: -0.01 < < 0.01. Where D1 is the refractive power of the first lens, D2 is the refractive power of the second lens, D3 is the refractive power of the third lens, D4 is the refractive power of the fourth lens, D5 is the refractive power of the fifth lens, D6 is the refractive power of the sixth lens, n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, and n6 is the refractive index of the sixth lens.

[0068] According to an embodiment of the present invention, the optical imaging system satisfies the following condition: -0.01 < < 0.01. Where D1 is the refractive power of the first lens, D2 is the refractive power of the second lens, D3 is the refractive power of the third lens, D4 is the refractive power of the fourth lens, D5 is the refractive power of the fifth lens, D6 is the refractive power of the sixth lens, υ1 is the Abbe number of the first lens, υ2 is the Abbe number of the second lens, υ3 is the Abbe number of the third lens, υ4 is the Abbe number of the fourth lens, υ5 is the Abbe number of the fifth lens, and υ6 is the Abbe number of the sixth lens.

[0069] According to an embodiment of the present invention, the optical imaging system satisfies the following condition: 2.60 ≤ EFL / EPD ≤ 3.40, where EFL is the effective focal length of the optical imaging system and EPD is the entrance pupil diameter of the optical imaging system.

[0070] According to an embodiment of the present invention, the optical imaging system satisfies the following condition: 0.75 mm / ° ≤ EFL / FOV ≤ 1.00 mm / °. Wherein, EFL is the effective focal length of the optical imaging system, and FOV is the field of view of the optical imaging system.

[0071] According to an embodiment of the present invention, the optical imaging system further includes: a prism disposed on the optical axis and opposite to the object-side surface of the first lens, wherein the optical imaging system satisfies the following condition: 3.50 ≤ TTL / SDL ≤ 4.50. Wherein TTL is the distance from the object-side surface of the prism to the imaging plane on the optical axis, and SDL is the diagonal length of the imaging plane.

[0072] According to an embodiment of the present invention, the optical imaging system satisfies the following condition: 1.00 ≤ ≤ 2.00. Where CTHK1 is the center thickness of the first lens on the optical axis, CTHK2 is the center thickness of the second lens on the optical axis, CTHK3 is the center thickness of the third lens on the optical axis, CTHK4 is the center thickness of the fourth lens on the optical axis, CTHK5 is the center thickness of the fifth lens on the optical axis, CTHK6 is the center thickness of the sixth lens on the optical axis, ATHK1 is the distance from the image-side surface of the first lens to the object-side surface of the second lens on the optical axis, ATHK2 is the distance from the image-side surface of the second lens to the object-side surface of the third lens on the optical axis, ATHK3 is the distance from the image-side surface of the third lens to the object-side surface of the fourth lens on the optical axis, ATHK4 is the distance from the image-side surface of the fourth lens to the object-side surface of the fifth lens on the optical axis, ATHK5 is the distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens on the optical axis, and ATHK6 is the distance from the image-side surface of the sixth lens to the imaging plane on the optical axis.

[0073] According to an embodiment of the present invention, the optical imaging system satisfies the following condition: 0.40 ≤ CTHK(N) / ETHK(N) ≤ 0.50. Wherein CTHK(N) is the center thickness of the Nth lens, and ETHK(N) is the edge thickness of the Nth lens, where N is a positive integer from 1 to 6.

[0074] According to an embodiment of the present invention, the optical imaging system further includes an aperture, wherein the aperture is located on the image-side surface of the first lens, and the radius of the aperture is greater than or equal to 2.70 mm.

[0075] According to an embodiment of the present invention, the optical imaging system further includes an infrared light filter disposed on the optical axis, located between the sixth lens and the imaging plane. Specifically, by forming a special coating layer on the flat glass to filter out light with wavelengths above 650 nm, infrared interference can be eliminated to improve image quality.

[0076] According to an embodiment of the present invention, the optical imaging system further includes: at least one prism disposed on the optical axis, opposite to the object-side surface of the first lens, or located between the infrared filter and the imaging plane.

[0077] According to embodiments of the present invention, the optical imaging system further includes: an image sensor disposed on the optical axis, with the imaging plane located on the light-incident surface of the image sensor. Specifically, in some embodiments, the image sensor is preferably a 1 / 2.5-inch CMOS sensor with a diagonal length of 7.18 mm, a pixel size of 1.38 μm, an aspect ratio of 16:9, and a resolution of 22 megapixels. The half-field-of-view imaging image height (IMGH) of the lens assembly is slightly larger than half of its diagonal size (IMGH > 3.584 mm) to avoid vignetting caused by packaging offset. However, this disclosure is not limited thereto.

[0078] Various embodiments of the optical imaging system of the present invention will be described below.

[0079] The following is for reference Figures 1A to 1C , Figures 2A to 2C , Figures 3A to 3C , Figures 4A to 4C , Figures 5A to 5C , Figures 6A to 6C , Figures 7A to 7C The optical imaging system of the first embodiment of the present invention will be described below.

[0080] Figures 1A to 1C This is a schematic diagram of the lens position and optical path of the optical imaging system according to the first embodiment of the present invention when the object distance is 200 mm, 600 mm and infinity.

[0081] The optical imaging system 10 according to the first embodiment of the present invention may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160 arranged sequentially from the object side.

[0082] The first lens 110 has positive refractive power. The object-side surface 111 of the first lens 110 is convex, and the image-side surface 112 of the first lens 110 is concave, making it a meniscus lens.

[0083] The second lens 120 has positive refractive power and can share the positive refractive power of the first lens 110. The object-side surface 121 of the second lens 120 is convex, and the image-side surface 122 of the second lens 120 is also convex.

[0084] The third lens 130 has negative refractive power, which complements the positive refractive power of the second lens 120, thus compensating for the aberrations produced by the second lens 120, which has positive refractive power. The object-side surface 131 and image-side surface 132 of the third lens 130 are both concave. The third lens 130 is made of a high-refractive-index (n = 1.634) and low Abbe number (υ = 23.845) plastic.

[0085] The fourth lens 140 has negative refractive power. The object-side surface 141 of the fourth lens 140 is concave, and the image-side surface 142 of the fourth lens 140 is convex, making it a negative meniscus lens.

[0086] The fifth lens 150 has positive refractive power and complements the fourth lens 140, which has negative refractive power, to correct the distortion produced by the fourth lens 140. The object-side surface 151 of the fifth lens 150 is convex, and the image-side surface 152 of the fifth lens 150 is also convex, making it a biconvex lens.

[0087] The sixth lens 160 has positive refractive power. The object-side surface 161 of the sixth lens 160 is convex, and the image-side surface 162 of the sixth lens 160 is also convex, making it a biconvex lens that converges light rays onto the imaging plane 191 and achieves a specified image height.

[0088] The optical imaging system 10 also includes an aperture 114 located on the image-side surface 112 of the first lens 110, and the radius of the aperture is greater than or equal to 2.70 mm.

[0089] The object-side surface and image-side surface of each of the first lens 110 to the sixth lens 160 are Q-type aspherical surfaces.

[0090] In this embodiment, the distance along the optical axis between the image-side surface 132 of the third lens 130 and the object-side surface 141 of the fourth lens 140 is variable. Specifically, the optical zoom effect is achieved by changing the air gap between the third lens 130 and the fourth lens 140.

[0091] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0092] 13.1 mm ≤ R1+R2 ≤ 26.8 mm;

[0093] -58.5 ≤ R3+R4 ≤ -31.5; and

[0094] -18.7 ≤ R5+R6 ≤ -6.5,

[0095] Wherein R1 is the radius of curvature of the object-side surface 111 of the first lens 110, R2 is the radius of curvature of the image-side surface 112 of the first lens 110, R3 is the radius of curvature of the object-side surface 121 of the second lens 120, R4 is the radius of curvature of the image-side surface 122 of the second lens 120, R5 is the radius of curvature of the object-side surface 131 of the third lens 130, and R6 is the radius of curvature of the image-side surface 132 of the third lens 130.

[0096] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0097] -73.7 mm ≤ R7+R8 ≤ -43.2 mm;

[0098] -2.6 mm ≤ R9+R10 ≤ 19.4 mm; and

[0099] -8.7 mm ≤ R11+R12 ≤ 5.6 mm,

[0100] Wherein R7 is the radius of curvature of the object-side surface 141 of the fourth lens 140, R8 is the radius of curvature of the image-side surface 142 of the fourth lens 140, R9 is the radius of curvature of the object-side surface 151 of the fifth lens 150, R10 is the radius of curvature of the image-side surface 152 of the fifth lens 150, R11 is the radius of curvature of the object-side surface 161 of the sixth lens 160, and R12 is the radius of curvature of the image-side surface 162 of the sixth lens 160.

[0101] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0102] 26.0 mm ≤ f1+f2 ≤ 31.0 mm;

[0103] -15.0 mm ≤ f3 + f4 ≤ -12.0 mm; and

[0104] 22.0 mm ≤ f5+f6 ≤ 27.0 mm,

[0105] Where f1 is the focal length of the first lens 110, f2 is the focal length of the second lens 120, f3 is the focal length of the third lens 130, f4 is the focal length of the fourth lens 140, f5 is the focal length of the fifth lens 150, and f6 is the focal length of the sixth lens 160.

[0106] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0107] n2 < n3, and υ3 < υ2,

[0108] Where n2 is the refractive index of the second lens 120, n3 is the refractive index of the third lens 130, υ2 is the Abbe number of the second lens 120, and υ3 is the Abbe number of the third lens 130.

[0109] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0110] n5 < n4, and υ4 < υ5,

[0111] Where n4 is the refractive index of the fourth lens 140, n5 is the refractive index of the fifth lens 150, υ4 is the Abbe number of the fourth lens 140, and υ5 is the Abbe number of the fifth lens 150.

[0112] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0113] -0.01 < < 0.01,

[0114] Where D1 is the refractive power of the first lens 110, D2 is the refractive power of the second lens 120, D3 is the refractive power of the third lens 130, D4 is the refractive power of the fourth lens 140, D5 is the refractive power of the fifth lens 150, D6 is the refractive power of the sixth lens 160, n1 is the refractive index of the first lens 110, n2 is the refractive index of the second lens 120, n3 is the refractive index of the third lens 130, n4 is the refractive index of the fourth lens 140, n5 is the refractive index of the fifth lens 150, and n6 is the refractive index of the sixth lens 160.

[0115] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0116] -0.01 < < 0.01,

[0117] Where D1 is the refractive power of the first lens 110, D2 is the refractive power of the second lens 120, D3 is the refractive power of the third lens 130, D4 is the refractive power of the fourth lens 140, D5 is the refractive power of the fifth lens 150, D6 is the refractive power of the sixth lens 160, υ1 is the Abbe number of the first lens 110, υ2 is the Abbe number of the second lens 120, υ3 is the Abbe number of the third lens 130, υ4 is the Abbe number of the fourth lens 140, υ5 is the Abbe number of the fifth lens 150, and υ6 is the Abbe number of the sixth lens 160.

[0118] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0119] 2.60 ≤ EFL / EPD ≤ 3.40

[0120] Where EFL is the effective focal length of the optical imaging system 10, and EPD is the entrance pupil diameter of the optical imaging system 10.

[0121] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0122] 0.75 mm / ° ≤ EFL / FOV ≤ 1.00 mm / °,

[0123] Where EFL is the effective focal length of the optical imaging system 10, and FOV is the field of view of the optical imaging system 10.

[0124] In this embodiment, the optical imaging system 10 further includes a prism 100. The optical imaging system 10 satisfies the following conditions:

[0125] 3.50 ≤ TTL / SDL ≤ 4.50

[0126] Where TTL is the distance from the object-side surface 101 of the prism 100 to the imaging plane 191 on the optical axis, and SDL is the diagonal length of the imaging plane 191.

[0127] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0128] 1.00 ≤ ≤ 2.00,

[0129] Wherein CTHK1 is the center thickness of the first lens 110 along the optical axis, CTHK2 is the center thickness of the second lens 120 along the optical axis, CTHK3 is the center thickness of the third lens 130 along the optical axis, CTHK4 is the center thickness of the fourth lens 140 along the optical axis, CTHK5 is the center thickness of the fifth lens 150 along the optical axis, CTHK6 is the center thickness of the sixth lens 160 along the optical axis, ATHK1 is the distance from the image-side surface 112 of the first lens 110 to the object-side surface 121 of the second lens 120 along the optical axis, and ATHK2 is... ATHK3 is the distance from the image-side surface 122 of the second lens 120 to the object-side surface 131 of the third lens 130 on the optical axis; ATHK4 is the distance from the image-side surface 132 of the third lens 130 to the object-side surface 141 of the fourth lens 140 on the optical axis; ATHK5 is the distance from the image-side surface 152 of the fifth lens 150 to the object-side surface 161 of the sixth lens 160 on the optical axis; and ATHK6 is the distance from the image-side surface 162 of the sixth lens 160 to the imaging plane on the optical axis.

[0130] In this embodiment, the optical imaging system 10 satisfies the following conditions:

[0131] 0.40 ≤ CTHK(N) / ETHK(N) ≤ 0.50,

[0132] Where CTHK(N) is the center thickness of the Nth lens, and ETHK(N) is the edge thickness of the Nth lens, where N is a positive integer from 1 to 6.

[0133] Specifically, the refractive index and Abbe parameters of the materials used for each lens are shown in Table 2. The relevant conic and Q-type aspherical coefficient values ​​for each Q-type aspherical lens are shown in Table 3. The optical parameters of this embodiment are shown in Table 4.

[0134] Table 2

[0135]

[0136] Table 3

[0137]

[0138] Table 4

[0139]

[0140] In this embodiment, the optical imaging system 10 further includes an infrared light filter 170, which is disposed on the optical axis and located between the sixth lens 160 and the imaging plane 191, to filter the infrared light portion of the incident light.

[0141] In this embodiment, the optical imaging system 10 further includes prisms 100 and 180. Prism 100 is disposed on the optical axis, opposite to the object-side surface 111 of the first lens 110. Prism 180 is located between the infrared filter 170 and the imaging plane 191. In this embodiment, both prisms 100 and 180 are plastic prisms. In some embodiments, both prisms 100 and 180 may be omitted. In some embodiments, only one of prisms 100 or 180 is present.

[0142] In this embodiment, the optical imaging system 10 further includes an image sensor 190, which is disposed on the optical axis. The imaging plane 191 is located at the light-incident surface of the image sensor 190.

[0143] In the first embodiment, the total length of the optical imaging system 10 is 28.588 mm. By changing the distance between the image-side surface 132 of the third lens 130 and the object-side surface 141 of the fourth lens 140, the equivalent focal length of the optical imaging system 10 is between 102.394 mm and 113.357 mm, the aperture value is less than 3.3, and it has an optical zoom ratio of 1.107 times during the telephoto change. At each focal length, the relative illumination at the half-field-of-view imaging image height (IMGH = 3.87 mm) on the imaging plane is greater than 88.0%. The half-field-of-view imaging image height not only meets the requirement of being greater than half the diagonal size of the image sensor (3.59 mm), but also avoids vignetting caused by excessively low relative illumination in the outermost field of view.

[0144] Figures 2A to 7C The optical characteristics of the optical imaging system 10.

[0145] Figure 2A The MTF curves of the optical imaging system of the first embodiment of the present invention are shown when the object distance is 200 mm and the normalized field of view is 0.0, 0.5, and 1.0. Figure 2B The MTF curves of the optical imaging system of the first embodiment of the present invention are shown when the object distance is 600 mm and the normalized field of view is 0.0, 0.5 and 1.0. Figure 2C The MTF curves of the optical imaging system of the first embodiment of the present invention are shown when the object distance is infinitely far and the normalized field of view is 0.0, 0.5, and 1.0.

[0146] In this embodiment, the MTF180 value is greater than 0.35 at half-space frequency across the entire field of view, indicating good resolution to meet the requirements of lens use.

[0147] Figures 3A to 3C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the first embodiment of the present invention when the object distance is 200 mm. Figures 4A to 4C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the first embodiment of the present invention when focused at an object distance of 600 mm. Figures 5A to 5C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the first embodiment of the present invention when the object distance is infinite.

[0148] like Figures 3A to 5CThe diagram shows the meridional field curvature, sagittal field curvature, and distortion under different object distances and focal lengths. The half field of view (HFOV) of this optical imaging system is designed to be approximately 11.00°. The maximum field curvature in both the meridional (T) and sagittal (S) directions occurs when the focus is at infinity. The meridional field curvature is approximately 0.119 mm at a normalized field of view of 1.0, corresponding to a maximum distortion rate of 1.583%.

[0149] Figures 6A to 6C The optical imaging system 10 of the first embodiment of the present invention focuses on the chromatic aberration at object distances of 200 mm, 600 mm and infinity. Figures 7A to 7C The optical imaging system of the first embodiment of the present invention focuses the principal ray angles at object distances of 200 mm, 600 mm and infinity, respectively.

[0150] like Figures 6A to 7C As shown, in the design of the optical imaging system 10 of the first embodiment of the present invention, the maximum lateral chromatic aberration is approximately 2.856 μm, and the maximum principal ray incident angle entering the image sensor 190 is less than 10.872°. The chromatic aberration and principal ray angle are well controlled, which can avoid color shift on the image sensor 190.

[0151] The following is for reference Figures 8A to 8C , Figures 9A to 9C , Figures 10A to 10C , Figures 11A to 11C , Figures 12A to 12C , Figures 13A to 13C , Figures 14A to 14C The optical imaging system of the second embodiment of the present invention will now be described.

[0152] Figures 8A to 8C This is a schematic diagram of the lens position and optical path of the optical imaging system according to the second embodiment of the present invention when the object distance is 200 mm, 600 mm and infinity.

[0153] The optical imaging system 20 according to the second embodiment of the present invention may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, and a sixth lens 260 arranged sequentially from the object side.

[0154] The first lens 210 has positive refractive power. The object-side surface 211 of the first lens 210 is convex, and the image-side surface 212 of the first lens 210 is concave, making it a meniscus lens.

[0155] The second lens 220 has positive refractive power and can share the positive refractive power of the first lens 210. The object-side surface 221 of the second lens 220 is convex, and the image-side surface 222 of the second lens 220 is also convex.

[0156] The third lens 230 has negative refractive power, which complements the positive refractive power of the second lens 220, thus compensating for the aberrations produced by the second lens 220, which has positive refractive power. The object-side surface 231 and image-side surface 232 of the third lens 230 are both concave. The third lens 230 is made of a high-refractive-index (n = 1.634) and low Abbe number (υ = 23.845) plastic.

[0157] The fourth lens 240 has negative refractive power. The object-side surface 241 of the fourth lens 240 is concave, and the image-side surface 242 of the fourth lens 240 is convex, making it a negative meniscus lens.

[0158] The fifth lens 250 has positive refractive power and complements the fourth lens 240, which has negative refractive power, to correct the distortion produced by the fourth lens 240. The object-side surface 251 of the fifth lens 250 is convex, and the image-side surface 252 of the fifth lens 250 is also convex, making it a biconvex lens.

[0159] The sixth lens 260 has positive refractive power. The object-side surface 261 of the sixth lens 260 is convex, and the image-side surface 262 of the sixth lens 260 is also convex, making it a biconvex lens that converges light rays onto the imaging plane 191 and achieves a specified image height.

[0160] The optical imaging system 20 also includes an aperture 214 located on the image-side surface 212 of the first lens 210, and the radius of the aperture is greater than or equal to 2.70 mm.

[0161] The object-side surface and image-side surface of each of the first lens 210 to the sixth lens 260 are Q-type aspherical surfaces.

[0162] In this embodiment, the distance along the optical axis between the image-side surface 232 of the third lens 230 and the object-side surface 241 of the fourth lens 240 is variable. Specifically, the optical zoom effect is achieved by changing the air gap between the third lens 230 and the fourth lens 240.

[0163] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0164] 13.1 mm ≤ R1+R2 ≤ 26.8 mm;

[0165] -58.5 mm ≤ R3+R4 ≤ -31.5 mm; and

[0166] -18.7 mm ≤ R5+R6 ≤ -6.5 mm,

[0167] Wherein R1 is the radius of curvature of the object-side surface 211 of the first lens 210, R2 is the radius of curvature of the image-side surface 212 of the first lens 210, R3 is the radius of curvature of the object-side surface 221 of the second lens 220, R4 is the radius of curvature of the image-side surface 222 of the second lens 220, R5 is the radius of curvature of the object-side surface 231 of the third lens 230, and R6 is the radius of curvature of the image-side surface 232 of the third lens 230.

[0168] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0169] -73.7 mm ≤ R7+R8 ≤ -43.2 mm;

[0170] -2.6 mm ≤ R9+R10 ≤ 19.4 mm; and

[0171] -8.7 mm ≤ R11+R12 ≤ 5.6 mm,

[0172] Wherein R7 is the radius of curvature of the object-side surface 241 of the fourth lens 240, R8 is the radius of curvature of the image-side surface 242 of the fourth lens 240, R9 is the radius of curvature of the object-side surface 251 of the fifth lens 250, R10 is the radius of curvature of the image-side surface 252 of the fifth lens 250, R11 is the radius of curvature of the object-side surface 261 of the sixth lens 260, and R12 is the radius of curvature of the image-side surface 262 of the sixth lens 260.

[0173] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0174] 26.0 mm ≤ f1+f2 ≤ 31.0 mm;

[0175] -15.0 mm ≤ f3 + f4 ≤ -12.0 mm; and

[0176] 22.0 mm ≤ f5+f6 ≤ 27.0 mm,

[0177] Where f1 is the focal length of the first lens 210, f2 is the focal length of the second lens 220, f3 is the focal length of the third lens 230, f4 is the focal length of the fourth lens 240, f5 is the focal length of the fifth lens 250, and f6 is the focal length of the sixth lens 260.

[0178] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0179] n2 < n3, and υ3 < υ2,

[0180] Where n2 is the refractive index of the second lens 220, n3 is the refractive index of the third lens 230, υ2 is the Abbe number of the second lens 220, and υ3 is the Abbe number of the third lens 230.

[0181] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0182] n5 < n4, and υ4 < υ5,

[0183] Where n4 is the refractive index of the fourth lens 240, n5 is the refractive index of the fifth lens 250, υ4 is the Abbe number of the fourth lens 240, and υ5 is the Abbe number of the fifth lens 250.

[0184] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0185] -0.01 < < 0.01,

[0186] Where D1 is the refractive power of the first lens 210, D2 is the refractive power of the second lens 220, D3 is the refractive power of the third lens 230, D4 is the refractive power of the fourth lens 240, D5 is the refractive power of the fifth lens 250, D6 is the refractive power of the sixth lens 260, n1 is the refractive index of the first lens 210, n2 is the refractive index of the second lens 220, n3 is the refractive index of the third lens 230, n4 is the refractive index of the fourth lens 240, n5 is the refractive index of the fifth lens 250, and n6 is the refractive index of the sixth lens 260.

[0187] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0188] -0.01 < < 0.01,

[0189] Where D1 is the refractive power of the first lens 210, D2 is the refractive power of the second lens 220, D3 is the refractive power of the third lens 230, D4 is the refractive power of the fourth lens 240, D5 is the refractive power of the fifth lens 250, D6 is the refractive power of the sixth lens 260, υ1 is the Abbe number of the first lens 210, υ2 is the Abbe number of the second lens 220, υ3 is the Abbe number of the third lens 230, υ4 is the Abbe number of the fourth lens 240, υ5 is the Abbe number of the fifth lens 250, and υ6 is the Abbe number of the sixth lens 260.

[0190] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0191] 2.60 ≤ EFL / EPD ≤ 3.40

[0192] Where EFL is the effective focal length of the optical imaging system 20, and EPD is the entrance pupil diameter of the optical imaging system 20.

[0193] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0194] 0.75 mm / ° ≤ EFL / FOV ≤ 1.00 mm / °,

[0195] Where EFL is the effective focal length of the optical imaging system 20, and FOV is the field of view of the optical imaging system 20.

[0196] In this embodiment, the optical imaging system 20 further includes a prism 200. The optical imaging system 20 satisfies the following conditions:

[0197] 3.50 ≤ TTL / SDL ≤ 4.50

[0198] Where TTL is the distance from the object-side surface 201 of prism 200 to the imaging plane 291 on the optical axis, and SDL is the diagonal length of the imaging plane 291.

[0199] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0200] 1.00 ≤ ≤ 2.00,

[0201] Wherein CTHK1 is the center thickness of the first lens 210 along the optical axis, CTHK2 is the center thickness of the second lens 220 along the optical axis, CTHK3 is the center thickness of the third lens 230 along the optical axis, CTHK4 is the center thickness of the fourth lens 240 along the optical axis, CTHK5 is the center thickness of the fifth lens 250 along the optical axis, CTHK6 is the center thickness of the sixth lens 260 along the optical axis, ATHK1 is the distance from the image-side surface 212 of the first lens 210 to the object-side surface 221 of the second lens 220 along the optical axis, and ATHK2 is... ATHK3 is the distance from the image-side surface 222 of the second lens 220 to the object-side surface 231 of the third lens 230 on the optical axis; ATHK4 is the distance from the image-side surface 232 of the third lens 230 to the object-side surface 241 of the fourth lens 240 on the optical axis; ATHK5 is the distance from the image-side surface 252 of the fifth lens 250 to the object-side surface 261 of the sixth lens 260 on the optical axis; and ATHK6 is the distance from the image-side surface 262 of the sixth lens 260 to the imaging plane on the optical axis.

[0202] In this embodiment, the optical imaging system 20 satisfies the following conditions:

[0203] 0.40 ≤ CTHK(N) / ETHK(N) ≤ 0.50,

[0204] Where CTHK(N) is the center thickness of the Nth lens, and ETHK(N) is the edge thickness of the Nth lens, where N is a positive integer from 1 to 6.

[0205] Specifically, the refractive index and Abbe parameters of the materials used for each lens are shown in Table 5. The relevant conic and Q-type aspherical coefficient values ​​for each Q-type aspherical lens are shown in Table 6. The optical parameters of this embodiment are shown in Table 7.

[0206] Table 5

[0207]

[0208] Table 6

[0209]

[0210] Table 7

[0211]

[0212] In this embodiment, the optical imaging system 20 further includes an infrared light filter 270, which is disposed on the optical axis and located between the sixth lens 260 and the imaging plane 291, to filter the infrared light portion of the incident light.

[0213] In this embodiment, the optical imaging system 20 further includes prisms 200 and 280. Prism 200 is disposed on the optical axis, opposite to the object-side surface 211 of the first lens 210. Prism 280 is located between the infrared filter 270 and the imaging plane 291. In this embodiment, both prisms 200 and 280 are plastic prisms. In some embodiments, both prisms 200 and 280 may be omitted. In some embodiments, only one of prisms 200 or 280 is present.

[0214] In this embodiment, the optical imaging system 20 further includes an image sensor 290, which is disposed on the optical axis. The imaging plane 291 is located at the light-incident surface of the image sensor 290.

[0215] In the second embodiment, the total length of the optical imaging system 20 is 29.949 mm. By changing the distance between the image-side surface 232 of the third lens 230 and the object-side surface 241 of the fourth lens 240, the equivalent focal length of the optical imaging system 20 is between 106.307 mm and 115.945 mm, the aperture value is less than 3.2, and it has an optical zoom ratio of 1.091 times during focal length changes. At each focal length, the relative illumination at the half-field-of-view imaging image height (IMGH = 3.74 mm) on the imaging plane is greater than 89.3%. The half-field-of-view imaging image height not only meets the requirement of being greater than half the diagonal size of the image sensor (3.59 mm), but also avoids vignetting caused by excessively low relative illumination in the outermost field of view.

[0216] Figures 9A to 14C The optical characteristics of the optical imaging system 20.

[0217] Figure 9A The MTF curves of the optical imaging system of the second embodiment of the present invention are shown when the object distance is 200 mm and the normalized field of view is 0.0, 0.5, and 1.0. Figure 9B The MTF curves of the optical imaging system of the second embodiment of the present invention are shown when the object distance is 600 mm and the normalized field of view is 0.0, 0.5, and 1.0. Figure 9C The MTF curves of the optical imaging system of the second embodiment of the present invention are shown when the object distance is infinitely far and the normalized field of view is 0.0, 0.5, and 1.0.

[0218] In this embodiment, the MTF180 value is greater than 0.46 at half-space frequency across the entire field of view, indicating good resolution to meet the requirements of lens use.

[0219] Figures 10A to 10C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the second embodiment of the present invention when the object distance is 200 mm. Figures 11A to 11C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the second embodiment of the present invention when the object distance is 600 mm. Figures 12A to 12C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the second embodiment of the present invention when the object distance is infinite.

[0220] like Figures 10A to 12CThe diagram shows the meridional field curvature, sagittal field curvature, and distortion under different object distances and focal lengths. The half field of view (HFOV) of this optical imaging system is designed to be approximately 10.63°. The maximum field curvature in both the meridional (T) and sagittal (S) directions occurs when the focus is at infinity. The meridional field curvature is approximately 0.067 mm at a normalized field of view of 1.0, corresponding to a maximum distortion rate of 1.403%.

[0221] Figures 13A to 13C The optical imaging system 20 of the second embodiment of the present invention focuses on the chromatic aberration at object distances of 200 mm, 600 mm and infinity. Figures 14A to 14C The optical imaging systems of the second embodiment of the present invention focus on the principal ray angles at object distances of 200 mm, 600 mm and infinity, respectively.

[0222] like Figures 13A to 14C As shown, in the design of the optical imaging system 20 of the second embodiment of the present invention, the maximum lateral chromatic aberration is approximately 1.771 μm, and the maximum principal ray incident angle entering the image sensor 290 is less than 10.477°. The chromatic aberration and principal ray angle are well controlled, which can avoid color shift on the image sensor 290.

[0223] The following is for reference Figures 15A to 15C , Figures 16A to 16C , Figures 17A to 17C , Figures 18A to 18C , Figures 19A to 19C , Figures 20A to 20C , Figures 21A to 21C The optical imaging system of the third embodiment of the present invention will now be described.

[0224] Figures 15A to 15C This is a schematic diagram of the lens position and optical path of the optical imaging system according to the third embodiment of the present invention when the object distance is 200 mm, 600 mm and infinity.

[0225] The optical imaging system 30 according to the third embodiment of the present invention may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, and a sixth lens 360 arranged sequentially from the object side.

[0226] The first lens 310 has positive refractive power. The object-side surface 311 of the first lens 310 is convex, and the image-side surface 312 of the first lens 310 is concave, making it a meniscus lens.

[0227] The second lens 320 has positive refractive power and can share the positive refractive power of the first lens 310. The object-side surface 321 of the second lens 320 is convex, and the image-side surface 322 of the second lens 320 is also convex.

[0228] The third lens 330 has negative refractive power, which complements the positive refractive power of the second lens 320, thus compensating for the aberrations produced by the second lens 320, which has positive refractive power. The object-side surface 331 and image-side surface 332 of the third lens 330 are both concave. The third lens 330 is made of a high-refractive-index (n = 1.634) and low Abbe number (υ = 23.845) plastic.

[0229] The fourth lens 340 has negative refractive power. The object-side surface 341 of the fourth lens 340 is concave, and the image-side surface 342 of the fourth lens 340 is convex, making it a negative meniscus lens.

[0230] The fifth lens 350 has positive refractive power and complements the fourth lens 340, which has negative refractive power, to correct the distortion produced by the fourth lens 340. The object-side surface 351 of the fifth lens 350 is convex, and the image-side surface 352 of the fifth lens 350 is also convex, making it a biconvex lens.

[0231] The sixth lens 360 has positive refractive power. The object-side surface 361 of the sixth lens 360 is convex, and the image-side surface 362 of the sixth lens 360 is also convex, making it a biconvex lens that converges light rays onto the imaging plane 391 and achieves a specified image height.

[0232] The optical imaging system 30 also includes an aperture 314 located on the image-side surface 312 of the first lens 310, and the radius of the aperture is greater than or equal to 2.70 mm.

[0233] The object-side surface and image-side surface of each of the first lens 310 to the sixth lens 360 are Q-type aspherical surfaces.

[0234] In this embodiment, the distance along the optical axis between the image-side surface 332 of the third lens 330 and the object-side surface 341 of the fourth lens 340 is variable. Specifically, the optical zoom effect is achieved by changing the air gap between the third lens 330 and the fourth lens 340.

[0235] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0236] 13.1 mm ≤ R1+R2 ≤ 26.8 mm;

[0237] -58.5 mm ≤ R3+R4 ≤ -31.5 mm; and

[0238] -18.7 mm ≤ R5+R6 ≤ -6.5 mm,

[0239] Wherein R1 is the radius of curvature of the object-side surface 311 of the first lens 310, R2 is the radius of curvature of the image-side surface 312 of the first lens 310, R3 is the radius of curvature of the object-side surface 321 of the second lens 320, R4 is the radius of curvature of the image-side surface 322 of the second lens 320, R5 is the radius of curvature of the object-side surface 331 of the third lens 330, and R6 is the radius of curvature of the image-side surface 332 of the third lens 330.

[0240] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0241] -73.7 mm ≤ R7+R8 ≤ -43.2 mm;

[0242] -2.6 mm ≤ R9+R10 ≤ 19.4 mm; and

[0243] -8.7 mm ≤ R11+R12 ≤ 5.6 mm,

[0244] Wherein R7 is the radius of curvature of the object-side surface 341 of the fourth lens 340, R8 is the radius of curvature of the image-side surface 342 of the fourth lens 340, R9 is the radius of curvature of the object-side surface 351 of the fifth lens 350, R10 is the radius of curvature of the image-side surface 352 of the fifth lens 350, R11 is the radius of curvature of the object-side surface 361 of the sixth lens 360, and R12 is the radius of curvature of the image-side surface 362 of the sixth lens 360.

[0245] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0246] 26.0 mm ≤ f1+f2 ≤ 31.0 mm;

[0247] -15.0 mm ≤ f3 + f4 ≤ -12.0 mm; and

[0248] 22.0 mm ≤ f5+f6 ≤ 27.0 mm,

[0249] Where f1 is the focal length of the first lens 310, f2 is the focal length of the second lens 320, f3 is the focal length of the third lens 330, f4 is the focal length of the fourth lens 340, f5 is the focal length of the fifth lens 350, and f6 is the focal length of the sixth lens 360.

[0250] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0251] n2 < n3, and υ3 < υ2,

[0252] Where n2 is the refractive index of the second lens 320, n3 is the refractive index of the third lens 330, υ2 is the Abbe number of the second lens 320, and υ3 is the Abbe number of the third lens 330.

[0253] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0254] n5 < n4, and υ4 < υ5,

[0255] Where n4 is the refractive index of the fourth lens 340, n5 is the refractive index of the fifth lens 350, υ4 is the Abbe number of the fourth lens 340, and υ5 is the Abbe number of the fifth lens 350.

[0256] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0257] -0.01 < < 0.01,

[0258] Where D1 is the refractive power of the first lens 310, D2 is the refractive power of the second lens 320, D3 is the refractive power of the third lens 330, D4 is the refractive power of the fourth lens 340, D5 is the refractive power of the fifth lens 350, D6 is the refractive power of the sixth lens 360, n1 is the refractive index of the first lens 310, n2 is the refractive index of the second lens 320, n3 is the refractive index of the third lens 330, n4 is the refractive index of the fourth lens 340, n5 is the refractive index of the fifth lens 350, and n6 is the refractive index of the sixth lens 360.

[0259] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0260] -0.01 < < 0.01,

[0261] Where D1 is the refractive power of the first lens 310, D2 is the refractive power of the second lens 320, D3 is the refractive power of the third lens 330, D4 is the refractive power of the fourth lens 340, D5 is the refractive power of the fifth lens 350, D6 is the refractive power of the sixth lens 360, υ1 is the Abbe number of the first lens 310, υ2 is the Abbe number of the second lens 320, υ3 is the Abbe number of the third lens 330, υ4 is the Abbe number of the fourth lens 340, υ5 is the Abbe number of the fifth lens 350, and υ6 is the Abbe number of the sixth lens 360.

[0262] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0263] 2.60 ≤ EFL / EPD ≤ 3.40

[0264] Where EFL is the effective focal length of the optical imaging system 30, and EPD is the entrance pupil diameter of the optical imaging system 30.

[0265] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0266] 0.75 mm / ° ≤ EFL / FOV ≤ 1.00 mm / °,

[0267] Where EFL is the effective focal length of the optical imaging system 30, and FOV is the field of view of the optical imaging system 30.

[0268] In this embodiment, the optical imaging system 30 further includes a prism 300. The optical imaging system 30 satisfies the following conditions:

[0269] 3.50 ≤ TTL / SDL ≤ 4.50

[0270] Where TTL is the distance from the object-side surface 301 of the prism 300 to the imaging plane 391 on the optical axis, and SDL is the diagonal length of the imaging plane 391.

[0271] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0272] 1.00 ≤ ≤ 2.00,

[0273] Wherein CTHK1 is the center thickness of the first lens 310 along the optical axis, CTHK2 is the center thickness of the second lens 320 along the optical axis, CTHK3 is the center thickness of the third lens 330 along the optical axis, CTHK4 is the center thickness of the fourth lens 340 along the optical axis, CTHK5 is the center thickness of the fifth lens 350 along the optical axis, CTHK6 is the center thickness of the sixth lens 360 along the optical axis, ATHK1 is the distance from the image-side surface 312 of the first lens 310 to the object-side surface 321 of the second lens 320 along the optical axis, and ATHK2 is... ATHK3 is the distance from the image-side surface 322 of the second lens 320 to the object-side surface 331 of the third lens 330 on the optical axis; ATHK4 is the distance from the image-side surface 332 of the third lens 330 to the object-side surface 341 of the fourth lens 340 on the optical axis; ATHK5 is the distance from the image-side surface 352 of the fifth lens 350 to the object-side surface 361 of the sixth lens 360 on the optical axis; and ATHK6 is the distance from the image-side surface 362 of the sixth lens 360 to the imaging plane on the optical axis.

[0274] In this embodiment, the optical imaging system 30 satisfies the following conditions:

[0275] 0.40 ≤ CTHK(N) / ETHK(N) ≤ 0.50,

[0276] Where CTHK(N) is the center thickness of the Nth lens, and ETHK(N) is the edge thickness of the Nth lens, where N is a positive integer from 1 to 6.

[0277] Specifically, the refractive index and Abbe parameters of the materials used for each lens are shown in Table 8. The relevant conic and Q-type aspherical coefficient values ​​for each Q-type aspherical lens are shown in Table 9. The optical parameters of this embodiment are shown in Table 10.

[0278] Table 8

[0279]

[0280] Table 9

[0281]

[0282] Table 10

[0283]

[0284] In this embodiment, the optical imaging system 30 further includes an infrared light filter 370, which is disposed on the optical axis and located between the sixth lens 360 and the imaging plane 391, to filter the infrared light portion of the incident light.

[0285] In this embodiment, the optical imaging system 30 further includes prisms 300 and 380. Prism 300 is disposed on the optical axis, opposite to the object-side surface 311 of the first lens 310. Prism 380 is located between the infrared filter 370 and the imaging plane 391. In this embodiment, both prisms 300 and 380 are plastic prisms. In some embodiments, both prisms 300 and 380 may be omitted. In some embodiments, only one of prisms 300 or 380 is present.

[0286] In this embodiment, the optical imaging system 30 further includes an image sensor 390, which is disposed on the optical axis. The imaging plane 391 is located at the light-incident surface of the image sensor 390.

[0287] In the third embodiment, the total length of the optical imaging system 30 is 31.745 mm. By changing the distance between the image-side surface 332 of the third lens 330 and the object-side surface 341 of the fourth lens 340, the equivalent focal length of the optical imaging system 30 is between 112.815 mm and 120.978 mm, the aperture value is less than 3.0, and it has an optical zoom ratio of 1.072 times during the telephoto change. At each focal length, the relative illumination at the half-field-of-view imaging image height (IMGH = 3.77 mm) on the imaging plane is greater than 90.3%. The half-field-of-view imaging image height not only meets the requirement of being greater than half the diagonal size of the image sensor (3.59 mm), but also avoids vignetting caused by excessively low relative illumination in the outermost field of view.

[0288] Figures 16A to 21C The optical characteristics of the optical imaging system 30.

[0289] Figure 16A The MTF curves of the optical imaging system of the third embodiment of the present invention are shown when the object distance is 200 mm and the normalized field of view is 0.0, 0.5, and 1.0. Figure 16B The MTF curves of the optical imaging system of the third embodiment of the present invention are shown when the object distance is 600 mm and the normalized field of view is 0.0, 0.5, and 1.0. Figure 16C The MTF curves of the optical imaging system of the third embodiment of the present invention are shown when the object distance is infinitely far and the normalized field of view is 0.0, 0.5, and 1.0.

[0290] In this embodiment, the MTF180 value is greater than 0.33 at half-space frequency across the entire field of view, indicating good resolution to meet the requirements of lens use.

[0291] Figures 17A to 17C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the third embodiment of the present invention when the object distance is 200 mm. Figures 18A to 18C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the third embodiment of the present invention when the object distance is 600 mm. Figures 19A to 19C These are the meridional field curvature, sagittal field curvature, and distortion of the optical imaging system of the third embodiment of the present invention when the object distance is infinite.

[0292] like Figures 17A to 19CThe diagram shows the meridional field curvature, sagittal field curvature, and distortion under different object distances and focal lengths. The half field of view (HFOV) of this optical imaging system is designed to be approximately 10.64°. The maximum field curvature in both the meridional (T) and sagittal (S) directions occurs when the focus is at infinity. The meridional field curvature is approximately 0.928 mm at a normalized field of view of 1.0, corresponding to a maximum distortion rate of 1.286%.

[0293] Figures 20A to 20C The optical imaging system 30 of the third embodiment of the present invention focuses on the vertical chromatic aberration at object distances of 200 mm, 600 mm and infinity. Figures 21A to 21C The optical imaging systems of the third embodiment of the present invention focus on the principal ray angles at object distances of 200 mm, 600 mm, and infinity, respectively.

[0294] like Figures 20A to 21C As shown, in the design of the optical imaging system 30 of the third embodiment of the present invention, the maximum lateral chromatic aberration is approximately 2.307 μm, and the maximum principal ray incident angle entering the image sensor 390 is less than 9.222°. The chromatic aberration and principal ray angle are well controlled, thus avoiding color shift on the image sensor 390.

[0295] Figure 22 This is a schematic diagram of the lens position and optical path of an optical imaging system according to the fourth embodiment of the present invention.

[0296] Please refer to Figure 22 . Figure 22 The optical imaging system 40 includes a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, and a sixth lens 460 arranged sequentially from the object side. The properties of the first lens 410, the second lens 420, the third lens 430, the fourth lens 440, the fifth lens 450, and the sixth lens 460 are similar to those of the first lens 310, the second lens 320, the third lens 330, the fourth lens 340, the fifth lens 350, and the sixth lens 360 in the third embodiment, and therefore will not be described again. In some embodiments, the first lens 410, the second lens 420, the third lens 430, the fourth lens 440, the fifth lens 450, and the sixth lens 460 may also be replaced by the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 of the first embodiment, or the first lens 210, the second lens 220, the third lens 230, the fourth lens 240, the fifth lens 250, and the sixth lens 260 of the second embodiment.

[0297] The optical imaging system 40 also includes an aperture 414 located on the image-side surface of the first lens 410.

[0298] The optical imaging system 40 also includes an infrared light filter 470, which is disposed on the optical axis and located between the sixth lens 460 and the imaging plane 491, to filter the infrared light portion of the incident light.

[0299] The optical imaging system 40 also includes a prism 480. The prism 480 is located between the infrared filter 470 and the imaging plane 491. In this embodiment, the prism 480 is a plastic prism. In this embodiment, the prism 480 is a triangular lens used to change the direction of the optical axis.

[0300] In this embodiment, the optical imaging system 40 further includes an image sensor 490, which is disposed on the optical axis. The imaging plane 491 is located at the light-incident surface of the image sensor 490.

[0301] Figure 23 A schematic diagram of the lens position and optical path of an optical imaging system according to a fifth embodiment of the present invention.

[0302] Please refer to Figure 23 . Figure 23 The optical imaging system 50 includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, and a sixth lens 560 arranged sequentially from the object side. The properties of the first lens 510, the second lens 520, the third lens 530, the fourth lens 540, the fifth lens 550, and the sixth lens 560 are similar to those of the first lens 310, the second lens 320, the third lens 330, the fourth lens 340, the fifth lens 350, and the sixth lens 360 in the third embodiment, and therefore will not be described again. In some embodiments, the first lens 510, the second lens 520, the third lens 530, the fourth lens 540, the fifth lens 550, and the sixth lens 560 may also be replaced by the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 of the first embodiment, or the first lens 210, the second lens 220, the third lens 230, the fourth lens 240, the fifth lens 250, and the sixth lens 260 of the second embodiment.

[0303] The optical imaging system 50 also includes an aperture 514 located on the image-side surface of the first lens 510.

[0304] The optical imaging system 50 also includes an infrared light filter 570, which is disposed on the optical axis and located between the sixth lens 560 and the imaging plane 591, to filter the infrared light portion of the incident light.

[0305] The optical imaging system 50 also includes prisms 500 and 580. Prism 500 is disposed on the optical axis, opposite to the object-side surface of the first lens 510. Prism 580 is located between the infrared filter 570 and the imaging plane 591. Light rays enter the optical imaging system 500 through the object-side surface 501 of prism 500. In this embodiment, both prisms 500 and 580 are plastic prisms. In this embodiment, both prisms 500 and 580 are triangular lenses used to change the direction of the optical axis. In this embodiment, the incident light direction and the exit light direction of the optical imaging system 50 are opposite.

[0306] In this embodiment, the optical imaging system 50 further includes an image sensor 590, which is disposed on the optical axis. The imaging plane 591 is located on the light-incident surface of the image sensor 590.

[0307] Figure 24 A schematic diagram of the lens position and optical path of an optical imaging system according to a sixth embodiment of the present invention.

[0308] Please refer to Figure 24 . Figure 24 The optical imaging system 60 includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, and a sixth lens 660 arranged sequentially from the object side. The properties of the first lens 610, the second lens 620, the third lens 630, the fourth lens 640, the fifth lens 650, and the sixth lens 660 are similar to those of the first lens 310, the second lens 320, the third lens 330, the fourth lens 340, the fifth lens 350, and the sixth lens 360 in the third embodiment, and therefore will not be described again. In some embodiments, the first lens 610, the second lens 620, the third lens 630, the fourth lens 640, the fifth lens 650, and the sixth lens 660 may also be replaced by the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 of the first embodiment, or the first lens 210, the second lens 220, the third lens 230, the fourth lens 240, the fifth lens 250, and the sixth lens 260 of the second embodiment.

[0309] The optical imaging system 60 also includes an infrared light filter 670, which is disposed on the optical axis and located between the sixth lens 660 and the imaging plane 691, to filter the infrared light portion of the incident light.

[0310] The optical imaging system 60 also includes prisms 600 and 680. Prism 600 is disposed on the optical axis, opposite to the object-side surface of the first lens 610. Prism 680 is located between the infrared filter 670 and the imaging plane 691. Light rays enter the optical imaging system 600 through the object-side surface 601 of prism 600. In this embodiment, both prisms 600 and 680 are plastic prisms. In this embodiment, both prisms 600 and 680 are triangular lenses used to change the direction of the optical axis. In this embodiment, the incident light direction and the exit light direction of the optical imaging system 60 are the same.

[0311] In this embodiment, the optical imaging system 60 further includes an image sensor 590, which is disposed on the optical axis. The imaging plane 691 is located on the light-incident surface of the image sensor 690.

[0312] In summary, the optical imaging system provided by this invention meets the manufacturing conditions for plastic injection molding and can change the lens focal length by moving the lens to achieve an optical zoom effect, i.e., the function of continuous optical zoom. Furthermore, the lenses in this optical imaging system are designed using Q-type aspherical surfaces, which not only eliminates aberrations but also reduces the number of lenses used, thus lowering the overall height of the optical imaging system.

Claims

1. An optical imaging system, characterized in that, include: The first lens has positive refractive power, the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave. The second lens has positive refractive power; The third lens has negative refractive power; The fourth lens has negative refractive power, and the object-side surface of the fourth lens is concave, while the image-side surface of the fourth lens is convex. The fifth lens has positive refractive power; The sixth lens has positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged sequentially from the object side. The object-side surface and image-side surface of each of the first to the sixth lenses are Q-type aspherical surfaces.

2. The optical imaging system according to claim 1, characterized in that, The distance along the optical axis between the image-side surface of the third lens and the object-side surface of the fourth lens is variable.

3. The optical imaging system according to claim 1, characterized in that, The object-side surface of the second lens is convex, and the image-side surface of the second lens is convex; the object-side surface of the third lens is concave, and the image-side surface of the third lens is concave; the object-side surface of the fifth lens is convex, and the image-side surface of the fifth lens is convex; the object-side surface of the sixth lens is convex, and the image-side surface of the sixth lens is convex.

4. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: 13.1 mm ≤ R1+R2 ≤ 26.8 mm; -58.5 mm ≤ R3+R4 ≤ -31.5 mm; and -18.7 mm ≤ R5+R6 ≤ -6.5 mm, in R1 is the radius of curvature of the object-side surface of the first lens. R2 is the radius of curvature of the image-side surface of the first lens. R3 is the radius of curvature of the object-side surface of the second lens. R4 is the radius of curvature of the image-side surface of the second lens. R5 is the radius of curvature of the object-side surface of the third lens. R6 is the radius of curvature of the image-side surface of the third lens.

5. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: -73.7 mm ≤ R7+R8 ≤ -43.2 mm; -2.6 mm ≤ R9+R10 ≤ 19.4 mm; and -8.7 mm ≤ R11+R12 ≤ 5.6 mm, in R7 is the radius of curvature of the object-side surface of the fourth lens. R8 is the radius of curvature of the image-side surface of the fourth lens. R9 is the radius of curvature of the object-side surface of the fifth lens. R10 is the radius of curvature of the image-side surface of the fifth lens. R11 is the radius of curvature of the object-side surface of the sixth lens. R12 is the radius of curvature of the image-side surface of the sixth lens.

6. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: 26.0 mm ≤ f1+f2 ≤ 31.0 mm; -15.0 mm ≤ f3 + f4 ≤ -12.0 mm; and 22.0 mm ≤ f5+f6 ≤ 27.0 mm, Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

7. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: n2 < n3, and υ3 < υ2, Where n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, υ2 is the Abbe number of the second lens, and υ3 is the Abbe number of the third lens.

8. The optical imaging system according to claim 1, wherein the following condition is satisfied: n5 < n4, and υ4 < υ5, Where n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, υ4 is the Abbe number of the fourth lens, and υ5 is the Abbe number of the fifth lens.

9. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: -0.01 < < 0.01， Wherein D1 is the refractive power of the first lens, D2 is the refractive power of the second lens, D3 is the refractive power of the third lens, D4 is the refractive power of the fourth lens, D5 is the refractive power of the fifth lens, D6 is the refractive power of the sixth lens, n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, and n6 is the refractive index of the sixth lens.

10. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: -0.01 < < 0.01， Wherein D1 is the refractive power of the first lens, D2 is the refractive power of the second lens, D3 is the refractive power of the third lens, D4 is the refractive power of the fourth lens, D5 is the refractive power of the fifth lens, D6 is the refractive power of the sixth lens, υ1 is the Abbe number of the first lens, υ2 is the Abbe number of the second lens, υ3 is the Abbe number of the third lens, υ4 is the Abbe number of the fourth lens, υ5 is the Abbe number of the fifth lens, and υ6 is the Abbe number of the sixth lens.

11. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: 2.60 ≤ EFL / EPD ≤ 3.40 Where EFL is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

12. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: 0.75 mm / ° ≤ EFL / FOV ≤ 1.00 mm / °, Where EFL is the effective focal length of the optical imaging system, and FOV is the field of view of the optical imaging system.

13. The optical imaging system according to claim 1, characterized in that, Also includes: A prism is positioned on the optical axis, opposite to the object-side surface of the first lens. Among them, the following conditions must be met: 3.50 ≤ TTL / SDL ≤ 4.50 Where TTL is the distance from the object-side surface of the prism to the imaging plane along the optical axis, and SDL is the diagonal length of the imaging plane.

14. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: 1.00 ≤ ≤ 2.00， Wherein CTHK1 is the center thickness of the first lens on the optical axis, CTHK2 is the center thickness of the second lens on the optical axis, CTHK3 is the center thickness of the third lens on the optical axis, CTHK4 is the center thickness of the fourth lens on the optical axis, CTHK5 is the center thickness of the fifth lens on the optical axis, CTHK6 is the center thickness of the sixth lens on the optical axis, ATHK1 is the distance from the image-side surface of the first lens to the object-side surface of the second lens on the optical axis, ATHK2 is the distance from the image-side surface of the second lens to the object-side surface of the third lens on the optical axis, ATHK3 is the distance from the image-side surface of the third lens to the object-side surface of the fourth lens on the optical axis, ATHK4 is the distance from the image-side surface of the fourth lens to the object-side surface of the fifth lens on the optical axis, ATHK5 is the distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens on the optical axis, and ATHK6 is the distance from the image-side surface of the sixth lens to the imaging plane on the optical axis.

15. The optical imaging system according to claim 1, characterized in that, The following conditions must be met: 0.40 ≤ CTHK(N) / ETHK(N) ≤ 0.50, Where CTHK(N) is the center thickness of the Nth lens, and ETHK(N) is the edge thickness of the Nth lens, where N is a positive integer from 1 to 6.

16. The optical imaging system according to claim 1, characterized in that, Also includes: An aperture, wherein the aperture is located on the image-side surface of the first lens, and the radius of the aperture is greater than or equal to 2.70 mm.

17. The optical imaging system according to claim 1, characterized in that, Also includes: An infrared light filter is disposed on the optical axis and located between the sixth lens and the imaging plane.

18. The optical imaging system according to claim 17, characterized in that, Also includes: At least one prism is disposed on the optical axis, opposite to the object-side surface of the first lens, or located between the infrared filter and the imaging plane.

19. The optical imaging system according to claim 1, characterized in that, Also includes: An image sensor is configured on the optical axis, and the imaging plane is located on the light-incident surface of the image sensor.

Images