Optical imaging device

Abstract

The application provides an optical imaging device. The optical imaging device comprises a lens barrel, a lens group and a plurality of spacer elements arranged in the lens barrel, the lens group is composed of six lenses; the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R2 of the image side surface of the first lens and the effective focal length f1 of the first lens satisfy: 2.55<(R1-R2) / f1<4.65; the inner diameter d0s of the object side end surface of the lens barrel, the effective diameter DT11 of the object side surface of the first lens and the entrance pupil diameter EPD of the optical imaging device satisfy: 0.40<(d0s-DT11) / EPD≤0.70. The application solves the problem that the difference between the radius of curvature of the object side surface and the image side surface of the front end lens in the prior art six-piece wide-angle optical imaging device is relatively large, and the optical imaging device is relatively sensitive to temperature change.

Description

Technical Field

[0001] This invention relates to the field of optical imaging equipment technology, and more specifically, to an optical imaging device. Background Technology

[0002] With the development of optical imaging equipment technology, optical imaging devices are widely used in electronic devices such as smart glasses and mobile terminals. Users have increasingly higher requirements for the imaging quality of optical imaging devices, especially six-element optical imaging devices. To meet these high imaging quality requirements, the design of optical imaging devices faces numerous challenges.

[0003] In some six-element optical imaging devices, in order to meet the wide-angle imaging requirements, there is a large difference in the radius of curvature between the object side and the image side of the front lens. However, lenses with large differences in radius of curvature will generate uneven thermal stress when the temperature changes. Uneven distribution of thermal stress can easily cause deformation of the front lens, which in turn leads to a large difference in the optical performance of the front lens before and after the temperature change.

[0004] In other words, the existing six-element wide-angle optical imaging device has a problem that the large difference in the radius of curvature between the object side and the image side of the front lens makes the optical imaging device more sensitive to temperature changes. Summary of the Invention

[0005] The main objective of this invention is to provide an optical imaging device that addresses the problem in existing six-element wide-angle optical imaging devices where the large difference in the radius of curvature between the object-side and image-side surfaces of the front lens makes the optical imaging device highly sensitive to temperature changes.

[0006] To achieve the above objectives, according to one aspect of the present invention, an optical imaging device is provided, comprising a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel. The lens group consists of six lenses, including a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with optical power, arranged sequentially from the object side to the image side along the optical axis of the optical imaging device. The object side and image side of the first lens are concave, the object side and image side of the third lens are convex, and the image side of the third lens is concave. An air gap exists between adjacent lenses in the lens group. The plurality of spacers includes at least a first spacer, a second spacer, a third spacer, a fourth spacer, and a fifth spacer. The first spacer is located between the first lens and... The second lens is between and in contact with the image-side surface of the first lens; the second spacer element is located between the second and third lenses and in contact with the image-side surface of the second lens; the third spacer element is located between the third and fourth lenses and in contact with the image-side surface of the third lens; the fourth spacer element is located between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens; the fifth spacer element is located between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens; the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 2.55 < (R1 - R2) / f1 < 4.65; the inner diameter d0s of the object-side end face of the lens barrel, the effective diameter DT11 of the object-side surface of the first lens, and the entrance pupil diameter EPD of the optical imaging device satisfy the following condition: 0.40 < (d0s - DT11) / EPD ≤ 0.70.

[0007] According to another aspect of the present invention, an optical imaging device is provided, comprising a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel. The lens group consists of six lenses, including a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with optical power, arranged sequentially from the object side to the image side along the optical axis of the optical imaging device. The object side and image side of the first lens are concave, the object side and image side of the third lens are convex, and the image side of the third lens is concave. An air gap exists between adjacent lenses in the lens group. The plurality of spacers includes at least a first spacer, a second spacer, a third spacer, a fourth spacer, and a fifth spacer. The first spacer is located between the first lens and the second lens. The first lens is positioned between two lenses and in contact with the image-side surface of the first lens. The second spacer is located between the second and third lenses and in contact with the image-side surface of the second lens. The third spacer is located between the third and fourth lenses and in contact with the image-side surface of the third lens. The fourth spacer is located between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens. The fifth spacer is located between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens. The radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 2.55 < (R1 - R2) / f1 < 4.65. The effective focal length f1 of the first lens, the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer in the optical axis direction, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: -67.00. <f1 / (EP01-CT1)<-13.00。

[0008] According to another aspect of the present invention, an optical imaging device is provided, comprising a lens barrel and a lens group and a plurality of spacers disposed within the lens barrel. The lens group consists of six lenses, including a first lens having negative optical power, a second lens having positive optical power, a third lens having negative optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, and a sixth lens having optical power, arranged sequentially from the object side to the image side along the optical axis of the optical imaging device. The object side and image side of the first lens are concave, the object side and image side of the third lens are convex, and the image side of the third lens are concave. An air gap exists between adjacent lenses in the lens group. The plurality of spacers includes at least a first spacer, a second spacer, a third spacer, a fourth spacer, and a fifth spacer, with the first spacer located at the first... A first lens is in contact with the image-side surface of the first lens, and a second spacer element is located between the second and third lenses and in contact with the image-side surface of the second lens. A third spacer element is located between the third and fourth lenses and in contact with the image-side surface of the third lens. A fourth spacer element is located between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens. A fifth spacer element is located between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens. The radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy the condition: 2.55 < (R1 - R2) / f1 < 4.65. The distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element in the optical axis direction, and the center thickness CT2 of the second lens in the optical axis satisfy the condition: 1.00. <EP01 / CT2<1.55。

[0009] Furthermore, the effective focal length f1 of the first lens, the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element in the direction of the optical axis, and the center thickness CT1 of the first lens in the optical axis satisfy the following condition: -67.00 <f1 / (EP01-CT1)<-13.00。

[0010] Furthermore, the outer diameter D1m of the image side of the first spacer element, the inner diameter d1m of the image side of the first spacer element, and the radius of curvature R3 of the object side of the second lens satisfy the following condition: 0.55 < (D1m - d1m) / R3 < 1.15.

[0011] Furthermore, the outer diameter D2s of the object side of the second spacer element, the effective diameter DT12 of the image side of the first lens, the outer diameter D2m of the image side of the second spacer element, and the effective diameter DT21 of the object side of the second lens satisfy the following condition: 0.80 < (D2s - DT12) / (D2m - DT21) < 1.00.

[0012] Furthermore, the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element in the direction of the optical axis, and the distance EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element in the direction of the optical axis satisfy: 0.95 < EP01 / EP12 < 1.80.

[0013] Furthermore, the distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element in the direction of the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.35 < EP23 / CT3 < 2.35.

[0014] Furthermore, the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: 2.25 < CT4 / CT5 < 3.15.

[0015] Furthermore, the distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element in the direction of the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the effective focal length f5 of the fifth lens satisfy: -0.20 ≤ (EP45 - CT5) / f5 < 0.

[0016] Furthermore, the inner diameter d5s of the object-side surface of the fifth spacer element and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: -3.50 ≤ d5s / R10 < 2.05.

[0017] Furthermore, when the air gap T56 between the image-side surface of the fifth lens and the object-side surface of the sixth lens on the optical axis, and the distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element in the direction of the optical axis satisfy 0.10 < T56 / EP45 < 0.65, the plurality of spacer elements further includes a fifth auxiliary spacer element, and the fifth auxiliary spacer element is located between the fifth spacer element and the sixth lens and contacts the image-side surface of the fifth spacer element.

[0018] Furthermore, the plurality of spacer elements further includes a fifth auxiliary spacer element, and the fifth auxiliary spacer element is located between the fifth spacer element and the sixth lens and contacts the image-side surface of the fifth spacer element. The outer diameter D5bm, the inner diameter d5bm, and the central thickness CP5b of the image-side surface of the fifth auxiliary spacer element on the optical axis satisfy: 1.45 < (D5bm - d5bm) / CP5b ≤ 3.30.

[0019] According to the technical solution of this invention, the optical imaging device includes a lens barrel and a lens group and multiple spacer elements disposed within the lens barrel. The lens group consists of six lenses, including a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with optical power, arranged sequentially from the object side to the image side along the optical axis of the optical imaging device. The object side and image side of the first lens are concave, while the object side and image side of the third lens are convex and concave. An air gap exists between adjacent lenses in the lens group. The multiple spacer elements include at least a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. The first spacer element is located between the first lens and the second lens and... The second spacer element is located between the second and third lenses and in contact with the image side of the second lens; the third spacer element is located between the third and fourth lenses and in contact with the image side of the third lens; the fourth spacer element is located between the fourth and fifth lenses and in contact with the image side of the fourth lens; and the fifth spacer element is located between the fifth and sixth lenses and in contact with the image side of the fifth lens. The radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 2.55 < (R1 - R2) / f1 < 4.65. The inner diameter d0s of the object side end face of the lens barrel, the effective diameter DT11 of the object side of the first lens, and the entrance pupil diameter EPD of the optical imaging device satisfy the following condition: 0.40 < (d0s - DT11) / EPD ≤ 0.70.

[0020] The optical imaging device of this application consists of a lens barrel, six lenses and at least five spacer elements, and satisfies 2.55 < (R1-R2) / f1 < 4.65. It can be seen that in order to meet the wide-angle imaging requirements, the object side and image side of the first lens located at the front end have a large difference in curvature radius. When the temperature changes, the uneven thermal stress will cause the first lens to deform, which will lead to a large difference in the optical performance of the first lens before and after the temperature change. That is, the first lens is quite sensitive to temperature changes. Based on this, this application controls the size of the effective optical diameter region of the object-side surface of the first lens by constraining the ratio of the inner diameter d0s of the object-side end face of the lens barrel, the effective diameter DT11 of the object-side surface of the first lens, and the entrance pupil diameter EPD of the optical imaging device. This improves the fit between the object-side end face of the lens barrel and the non-effective diameter region of the object-side surface of the first lens, ensuring the front-end aperture and increasing the light transmission while improving the imaging capability of each field of view, reducing the MTF change of the image caused by temperature changes, reducing the imaging difference of the optical imaging device before and after temperature changes, and thus reducing the temperature sensitivity of the optical imaging device. In other words, by constraining (d0s-DT11) / EPD within a reasonable range, the optical imaging device of this application effectively reduces the temperature sensitivity of the optical imaging device and ensures the stability of the optical performance of the optical imaging device under different environments. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 A dimensioned diagram of an optical imaging apparatus according to an alternative embodiment of the present invention is shown;

[0023] Figure 2 A partial structural schematic diagram of the optical imaging device according to Embodiment 1-1 of the present invention is shown;

[0024] Figure 3 A partial structural schematic diagram of the optical imaging device according to embodiments 1-2 of the present invention is shown;

[0025] Figure 4 A partial structural schematic diagram of the optical imaging device according to embodiments 1-3 of the present invention is shown;

[0026] Figure 5 The on-axis chromatic aberration curve of the optical imaging device according to Embodiment 1 of the present invention is shown;

[0027] Figure 6 The astigmatism curve of the optical imaging device according to Embodiment 1 of the present invention is shown;

[0028] Figure 7 The distortion curve of the optical imaging device according to Embodiment 1 of the present invention is shown;

[0029] Figure 8 A partial structural schematic diagram of the optical imaging device according to Embodiment 2-1 of the present invention is shown;

[0030] Figure 9 A partial structural schematic diagram of the optical imaging device according to Embodiment 2-2 of the present invention is shown;

[0031] Figure 10 A partial structural schematic diagram of the optical imaging device according to embodiments 2-3 of the present invention is shown;

[0032] Figure 11 The on-axis chromatic aberration curve of the optical imaging device according to Embodiment 2 of the present invention is shown;

[0033] Figure 12 The astigmatism curve of the optical imaging device according to Embodiment 2 of the present invention is shown;

[0034] Figure 13 The distortion curve of the optical imaging device according to Embodiment 2 of the present invention is shown;

[0035] Figure 14 A partial structural schematic diagram of the optical imaging device according to Embodiment 3-1 of the present invention is shown;

[0036] Figure 15 A partial structural schematic diagram of the optical imaging device according to Embodiment 3-2 of the present invention is shown;

[0037] Figure 16 A partial structural schematic diagram of the optical imaging device according to Embodiments 3-3 of the present invention is shown;

[0038] Figure 17 The on-axis chromatic aberration curve of the optical imaging device according to Embodiment 3 of the present invention is shown;

[0039] Figure 18 The astigmatism curve of the optical imaging device according to Embodiment 3 of the present invention is shown;

[0040] Figure 19 The distortion curve of the optical imaging device according to Embodiment 3 of the present invention is shown;

[0041] Figure 20 The diagram shows the MTF defocus curve analysis of an optical imaging device according to an optional embodiment of the present invention, satisfying (R1-R2) / f1=2.57 and (d0s-DT11) / EPD=0.56, before high temperature (25°C).

[0042] Figure 21The diagram shows the MTF defocus curve analysis of an optical imaging device according to an optional embodiment of the present invention, which satisfies (R1-R2) / f1=2.57 and (d0s-DT11) / EPD=0.56 after high temperature (60°C).

[0043] Figure 22 The MTF defocus curve analysis of an example optical imaging device satisfying (R1-R2) / f1=2.57 and (d0s-DT11) / EPD=0.30 before high temperature (25°C) is shown.

[0044] Figure 23 An example optical imaging device satisfying (R1-R2) / f1=2.57 and (d0s-DT11) / EPD=0.30 is shown, along with its MTF defocus curve analysis after high temperature (60°C).

[0045] Figure 24 Another example of an optical imaging device satisfying (R1-R2) / f1=2.57 and (d0s-DT11) / EPD=0.80 is shown in the MTF defocus curve analysis diagram before high temperature (25°C);

[0046] Figure 25 Another example of an optical imaging device satisfying (R1-R2) / f1=2.57 and (d0s-DT11) / EPD=0.80 is shown, with an MTF defocus curve analysis after high temperature (60°C).

[0047] The above figures include the following reference numerals:

[0048] P0, Lens tube; E1, First lens; P1, First spacer element; E2, Second lens; P2, Second spacer element; P2b, Second auxiliary spacer element; E3, Third lens; P3, Third spacer element; E4, Fourth lens; P4, Fourth spacer element; P4b, Fourth auxiliary spacer element; E5, Fifth lens; P5, Fifth spacer element; P5b, Fifth auxiliary spacer element; E6, Sixth lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; S9, Object-side surface of the fifth lens; S10, Image-side surface of the fifth lens; S11, Object-side surface of the sixth lens; S12, Image-side surface of the sixth lens. Detailed Implementation

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0051] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0052] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0053] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0054] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly known in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine convexity or concavity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex. In this application, the left side is the object side, and the right side is the image side.

[0055] To address the problem that existing six-element wide-angle optical imaging devices suffer from significant differences in the curvature radii between the object-side and image-side surfaces of the front lens, leading to the device's sensitivity to temperature changes, this invention provides an optical imaging device.

[0056] like Figures 1 to 21As shown, the optical imaging device includes a lens barrel and a lens group and multiple spacer elements disposed within the lens barrel. The lens group consists of six lenses, including a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with optical power, arranged sequentially from the object side to the image side along the optical axis of the optical imaging device. The object side and image side of the first lens are concave, while the object side and image side of the third lens are convex and concave. There is an air gap between adjacent lenses in the lens group. The multiple spacer elements include at least a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. The first spacer element is located between the first lens and the second lens and is adjacent to the first lens. The image-side surface of the lens is in contact with the second spacer element, which is located between the second and third lenses and in contact with the image-side surface of the second lens; the third spacer element is located between the third and fourth lenses and in contact with the image-side surface of the third lens; the fourth spacer element is located between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens; and the fifth spacer element is located between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens. The radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 2.55 < (R1 - R2) / f1 < 4.65. The inner diameter d0s of the object-side end face of the lens barrel, the effective diameter DT11 of the object-side surface of the first lens, and the entrance pupil diameter EPD of the optical imaging device satisfy the following condition: 0.40 < (d0s - DT11) / EPD ≤ 0.70.

[0057] The optical imaging device of this application consists of a lens barrel, six lenses and at least five spacer elements, and satisfies 2.55 < (R1-R2) / f1 < 4.65. It can be seen that in order to meet the wide-angle imaging requirements, the object side and image side of the first lens located at the front end have a large difference in curvature radius. When the temperature changes, the uneven thermal stress will cause the first lens to deform, which will lead to a large difference in the optical performance of the first lens before and after the temperature change. That is, the first lens is quite sensitive to temperature changes. Based on this, this application controls the size of the effective optical diameter region of the object-side surface of the first lens by constraining the ratio of the inner diameter d0s of the object-side end face of the lens barrel, the effective diameter DT11 of the object-side surface of the first lens, and the entrance pupil diameter EPD of the optical imaging device. This improves the fit between the object-side end face of the lens barrel and the non-effective diameter region of the object-side surface of the first lens, ensuring the front-end aperture and increasing the light transmission while improving the imaging capability of each field of view, reducing the MTF change of the image caused by temperature changes, reducing the imaging difference of the optical imaging device before and after temperature changes, and thus reducing the temperature sensitivity of the optical imaging device. In other words, by constraining (d0s-DT11) / EPD within a reasonable range, the optical imaging device of this application effectively reduces the temperature sensitivity of the optical imaging device and ensures the stability of the optical performance of the optical imaging device under different environments.

[0058] In addition, please refer to Table 1 below. Figures 20 to 25 As shown, under the premise that the optical imaging device satisfies 2.55 < (R1-R2) / f1 < 4.65, for example, (R1-R2) / f1 = 2.57, Figure 20 and Figure 21 The MTF defocus curve analysis diagrams of an optical imaging device according to an optional embodiment of the present invention before high temperature (25°C) and after high temperature (60°C) are shown respectively. Specifically, in this embodiment, the optical imaging device satisfies (d0s-DT11) / EPD=0.56. This embodiment is referred to as Scheme 1. Figure 22 and Figure 23 The MTF defocus curve analysis diagrams of an example optical imaging device before high temperature (25°C) and after high temperature (60°C) are shown respectively. Specifically, in this example, the optical imaging device satisfies (d0s-DT11) / EPD=0.30. This example is referred to as Example 1. Figure 24 and Figure 25MTF defocus curve analysis plots for another example optical imaging device before high temperature (25°C) and after high temperature (60°C) are shown respectively. Specifically, in this example, the optical imaging device satisfies (d0s-DT11) / EPD=0.80, hereinafter referred to as Example 2. In the temperature test, the optical imaging device was heated from ambient room temperature (25°C) to a high temperature (60°C).

[0059] The resolving power of the optical imaging devices in Scheme 1, Example 1, and Example 2 changes before and after high temperature. Resolving power, or the ability of the optical imaging device to resolve imaging details as simulated by the MTF defocus curve, is shown in Table 1. Table 1 describes the changes in resolving power of the optical imaging device at different (d0s-DT11) / EPD values ​​at various fields of view before and after high temperature. Specifically, Table 1 describes the changes and differences in resolving power of the optical imaging device in the sagittal plane (S, SAG), where 0.3F, 0.6F, 0.8F, and 1.0F are normalized notations of the field of view (1.0F represents the full field of view of the optical imaging device). For example, when the maximum field of view of the optical imaging device is 110.8°, 0.3F, 0.6F, 0.8F, and 1.0F correspond to field of view angles of 33.24°, 66.48°, 88.64°, and 110.8°, respectively.

[0060] Among them, Figures 20 to 25 In the diagram, the theoretical limit is the diffraction limit curve under theoretical conditions. Field of view one is the curve at 0.3F, i.e., the modulation curve formed by light rays at 0.3 times the full field of view; field of view two is the curve at 0.6F, i.e., the modulation curve formed by light rays at 0.6 times the full field of view; field of view three is the curve at 0.8F, i.e., the modulation curve formed by light rays at 0.8 times the full field of view; and field of view four is the curve at 1.0F, i.e., the modulation curve formed by light rays in the full field of view. Fields of view one through four are modulation curves in the sagittal direction.

[0061] As shown in Table 1, before and after high temperature, the MTF value of the optical imaging device of this application experiences an on-axis peak drop in the same field of view, that is, the MTF value corresponding to the 0mm defocus position of the optical imaging device drops. Specifically, before and after high temperature, the on-axis peak drop ratios of the optical imaging device of Scheme 1 in the fields of view of 0.3F, 0.6F, 0.8F, and 1.0F are 0.6%, 0.0%, 0.3%, and 2.3%, respectively; the on-axis peak drop ratios of the optical imaging device of Example 1 in the fields of view of 0.3F, 0.6F, 0.8F, and 1.0F are 4.2%, 1.3%, 0.4%, and 8.2%, respectively; and the on-axis peak drop ratios of the optical imaging device of Example 2 in the fields of view of 0.3F, 0.6F, 0.8F, and 1.0F are 0.9%, 6.6%, 5.2%, and 21.8%, respectively.

[0062] like Figure 20 and Figure 21 As shown, when the optical imaging device satisfies (d0s-DT11) / EPD=0.56, compared with the MTF defocus curve before high temperature, the peak value of the MTF defocus curve after high temperature does not drop significantly on the axis, and the peak concentration of the MTF defocus curve is better. In particular, the resolution of the optical imaging device in the sagittal plane changes less, indicating that the optical imaging device of Scheme 1 performs better before and after temperature change.

[0063] like Figure 22 and Figure 23 As shown, when the optical imaging device satisfies (d0s-DT11) / EPD=0.30, compared with the MTF defocus curve before high temperature, the peak value of the MTF defocus curve after high temperature drops significantly, and the peak concentration of the MTF defocus curve is poor. In particular, the resolution of the optical imaging device in the sagittal plane changes greatly, indicating that the performance of the optical imaging device in Example 1 is poor before and after temperature change.

[0064] like Figure 24 and Figure 25 As shown, when the optical imaging device satisfies (d0s-DT11) / EPD=0.80, compared with the MTF defocus curve before the high temperature, the peak value of the MTF defocus curve after the high temperature drops significantly, and the peak concentration of the MTF defocus curve is poor. In particular, the resolution of the optical imaging device in the sagittal plane changes greatly, indicating that the performance of the optical imaging device in Example 2 is poor before and after the temperature change.

[0065] In summary, when 2.55 < (R1-R2) / f1 < 4.65 and (d0s-DT11) / EPD is within the range of 0.40 to 0.70, the peak value of the MTF defocus curve after high temperature does not show a significant drop in on-axis peak value, the peak concentration of the MTF defocus curve is good, the temperature sensitivity of the optical imaging device is minimal, the resolution of the optical imaging device in the sagittal plane changes minimally, and the performance of the optical imaging device is the best before and after temperature change. Therefore, by constraining (R1-R2) / f1 and (d0s-DT11) / EPD within a reasonable range, this application can control the size of the effective optical diameter region of the object side of the first lens, thereby improving the matching relationship between the object side end face of the lens barrel and the non-effective diameter region of the object side of the first lens. While ensuring the front-end light transmission diameter and increasing the light transmission, it improves the imaging capability of each field of view, reduces the MTF change of imaging caused by temperature change, reduces the imaging difference of the optical imaging device before and after temperature change, and thus reduces the temperature sensitivity of the optical imaging device.

[0066] Table 1

[0067]

[0068] For example, in some alternative embodiments, the first lens has a negative optical power, which is conducive to more light entering the optical imaging device and ensuring a high light input amount of the optical imaging device. Also, for example, in some alternative embodiments, the second lens has a positive optical power, which can moderately converge light and balance the aberration brought by the first lens, thereby improving the imaging quality of the optical imaging device. Also, for example, in some alternative embodiments, the third lens has a negative optical power, which can further disperse the light from the second lens. Also, for example, in some alternative embodiments, the fourth lens has a positive optical power, continuously converging light while balancing the aberration brought by the front group of lenses to optimize the imaging quality. Also, for example, in some alternative embodiments, the fifth lens has a negative optical power, reasonably diverging light to keep the light trend stable. Also, for example, in some alternative embodiments, the object side surface of the first lens is concave, and the image side surface of the first lens is concave. The object side surface of the third lens is convex, and the image side surface of the third lens is concave. By reasonably constraining the surface types of each lens, it is conducive to reasonably constraining the light trend, ensuring a smooth transition of light, and facilitating aberration correction.

[0069] In some alternative embodiments, the effective focal length f1 of the first lens, the distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction, and the central thickness CT1 of the first lens on the optical axis satisfy: -67.00 < f1 / (EP01 - CT1) < -13.00. By controlling f1 / (EP01 - CT1) within a reasonable range, the refractive performance of the first lens is optimized to improve the imaging performance of the optical imaging device. At the same time, the position and thickness of the first lens are kept reasonable, enabling the first lens to provide sufficient structural stability and thermal stability, improving the manufacturability of the optical imaging device, reducing imaging deviations caused by factors such as vibration and temperature changes, and ensuring the imaging quality and imaging stability of the optical imaging device.

[0070] In some alternative embodiments, the outer diameter D1m of the image side surface of the first spacer element, the inner diameter d1m of the image side surface of the first spacer element, and the curvature radius R3 of the object side surface of the second lens satisfy: 0.55 < (D1m - d1m) / R3 < 1.15. By controlling (D1m - d1m) / R3 within a reasonable range, the ratio between the difference in the outer and inner diameters of the image side surface of the first spacer element and the curvature radius of the object side surface of the second lens can be constrained, optimizing the refractive ability of the second lens to ensure that light can be refracted and focused at an appropriate angle when passing through the second lens, thereby reducing stray light in the optical imaging device and improving the imaging quality of the optical imaging device.

[0071] In some optional embodiments, the following relationship is satisfied among the outer diameter D2s of the object side surface of the second spacer element, the effective diameter DT12 of the image side surface of the first lens, the outer diameter D2m of the image side surface of the second spacer element, and the effective diameter DT21 of the object side surface of the second lens: 0.80 < (D2s - DT12) / (D2m - DT21) < 1.00. By controlling (D2s - DT12) / (D2m - DT21) within a reasonable range, the range of light transmitted by the first lens and the second lens is optimized, ensuring that imaging light at large angles is properly refracted and transmitted when passing through the first lens, the second lens, and the second spacer element, reducing light loss and scattering, and thus improving the clarity and brightness of the imaging of the optical imaging device.

[0072] In some optional embodiments, the following relationship is satisfied between the spacing distance EP01 between the object side end surface of the lens barrel and the object side surface of the first spacer element in the optical axis direction and the spacing distance EP12 between the image side surface of the first spacer element and the object side surface of the second spacer element in the optical axis direction: 0.95 < EP01 / EP12 < 1.80. By controlling EP01 / EP12 within a reasonable range, the spacing between the object side end surface of the lens barrel, the first spacer element, and the second spacer element in the optical axis direction can be precisely controlled, which can indirectly restrict the edge thicknesses of the first lens and the second lens, ensure the structural strength of the first lens and the second lens, and further improve the stability of the assembly of the first lens and the second lens, reducing the risk of lens misalignment or deformation caused by vibration or temperature changes, and thus helping to reduce imaging deviation and ensuring the stability of the optical imaging device under various usage conditions.

[0073] In some optional embodiments, the following relationship is satisfied between the spacing distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction and the central thickness CT3 of the third lens on the optical axis: 1.35 < EP23 / CT3 < 2.35. By controlling EP23 / CT3 within a reasonable range, the ratio of the spacing distance between the image side surface of the second spacer element and the object side surface of the third spacer element in the optical axis direction to the central thickness of the third lens on the optical axis can be controlled, which can stabilize the relative position of the third lens and limit the edge thickness of the third lens, ensuring that the light path through the third lens is more reasonable and reducing stray light in the optical imaging device.

[0074] In some optional embodiments, the following relationship is satisfied between the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis: 2.25 < CT4 / CT5 < 3.15. By controlling CT4 / CT5 within a reasonable range, the ratio of the central thicknesses of the fourth lens and the fifth lens on the optical axis can be controlled. Reasonably distributing the thicknesses of the fourth lens and the fifth lens in the optical imaging device can ensure a reasonable layout of the fourth lens and the fifth lens, improving the processing feasibility and manufacturing yield of the fourth lens and the fifth lens.

[0075] In some optional embodiments, the distance EP45 between the image side of the fourth spacer element and the object side of the fifth spacer element in the direction of the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the effective focal length f5 of the fifth lens satisfy: -0.20 ≤ (EP45 - CT5) / f5 < 0. By controlling (EP45 - CT5) / f5 within a reasonable range, the ratio of the difference between the edge thickness and the central thickness of the fifth lens to the effective focal length of the fifth lens can be indirectly controlled, effectively optimizing the refraction angle and range of light passing through the fifth lens and reducing stray light in the optical imaging device.

[0076] In some optional embodiments, the inner diameter d5s of the object side of the fifth spacer element and the radius of curvature R10 of the image side of the fifth lens satisfy: -3.50 ≤ d5s / R10 < 2.05. By controlling d5s / R10 within a reasonable range and restricting the ratio of the inner diameter of the object side of the fifth spacer element to the radius of curvature of the image side of the fifth lens, the fifth spacer element can fully intercept stray light from the edge of the optically effective diameter region of the fifth lens, improving the imaging quality of the optical imaging device.

[0077] In some optional embodiments, when the air gap T56 between the image side of the fifth lens and the object side of the sixth lens on the optical axis and the distance EP45 between the image side of the fourth spacer element and the object side of the fifth spacer element in the direction of the optical axis satisfy 0.10 < T56 / EP45 < 0.65, the plurality of spacer elements further includes a fifth auxiliary spacer element located between the fifth spacer element and the sixth lens and in contact with the image side of the fifth spacer element. When the optical imaging device satisfies 0.10 < T56 / EP45 < 0.65, the air gap between the fifth lens and the sixth lens on the optical axis is relatively large. At this time, adding a fifth auxiliary spacer element between the fifth spacer element and the sixth lens can dynamically fill the gap between the non-effective diameter regions of the fifth lens and the sixth lens, avoiding excessive thickness in the non-effective diameter regions of the fifth lens and the sixth lens, and thus improving the assembly stability of the lens group.

[0078] In some optional embodiments, the plurality of spacer elements further includes a fifth auxiliary spacer element. The fifth auxiliary spacer element is located between the fifth spacer element and the sixth lens and contacts the image side surface of the fifth spacer element. The following relationship is satisfied among the outer diameter D5bm of the image side surface of the fifth auxiliary spacer element, the inner diameter d5bm of the image side surface of the fifth auxiliary spacer element, and the central thickness CP5b of the fifth auxiliary spacer element on the optical axis: 1.45 < (D5bm - d5bm) / CP5b ≤ 3.30. By controlling (D5bm - d5bm) / CP5b within a reasonable range, the ratio of the difference between the outer diameter and the inner diameter of the image side surface of the fifth auxiliary spacer element to the central thickness of the fifth spacer element on the optical axis can be controlled, ensuring that a sufficient amount of light can pass between the fifth lens and the sixth lens, guaranteeing the light flux of the optical imaging device, and further ensuring the imaging clarity and brightness of the optical imaging device.

[0079] In some optional embodiments, half of the maximum field of view angle Semi-FOV of the optical imaging device satisfies: 53.25° < Semi-FOV < 55.45°. Limiting half of the maximum field of view angle Semi-FOV of the optical imaging device within the range of 53.25° to 55.45° can ensure the field of view range of the optical imaging device.

[0080] In another aspect, in another optional embodiment, an optical imaging device is provided, including a lens barrel and a lens group and a plurality of spacer elements disposed within the lens barrel. The lens group consists of six lenses, including a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with optical power, arranged sequentially from the object side to the image side along the optical axis of the optical imaging device. The object side and image side of the first lens are concave, the object side of the third lens is convex, and the image side of the third lens is concave. An air gap exists between adjacent lenses in the lens group. The plurality of spacer elements include at least a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. The first spacer element is located at the first lens. The second spacer element is located between the second and third lenses and in contact with the image-side surface of the first lens; the third spacer element is located between the third and fourth lenses and in contact with the image-side surface of the third lens; the fourth spacer element is located between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens; the fifth spacer element is located between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens; the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 2.55 < (R1 - R2) / f1 < 4.65; the effective focal length f1 of the first lens, the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element in the optical axis direction, and the center thickness CT1 of the first lens in the optical axis satisfy the following condition: -67.00. <f1 / (EP01-CT1)<-13.00。

[0081] The optical imaging device of this application consists of a lens barrel, six lenses, and at least five spacer elements, satisfying 2.55 < (R1-R2) / f1 < 4.65. Therefore, to meet the wide-angle imaging requirements, the object-side and image-side radii of curvature of the first lens located at the front end have a significant difference. During temperature changes, uneven thermal stress can cause deformation of the first lens, leading to a large difference in its optical performance before and after temperature changes; that is, the first lens is highly sensitive to temperature changes. Based on this, this application optimizes the refractive performance of the first lens by controlling the relationship between the effective focal length f1 of the first lens, the spacing EP01 between the object-side end face of the lens barrel and the object-side face of the first spacer element along the optical axis, and the center thickness CT1 of the first lens along the optical axis. This improves the imaging performance of the optical imaging device while maintaining a reasonable position and thickness of the first lens, ensuring sufficient structural and thermal stability, improving the manufacturability of the optical imaging device, reducing imaging deviations caused by vibration, temperature changes, and other factors, and guaranteeing the imaging quality and stability of the optical imaging device.

[0082] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0083] In another aspect, in another optional embodiment, an optical imaging device is provided, including a lens barrel and a lens group and a plurality of spacer elements disposed within the lens barrel. The lens group consists of six lenses, including a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with optical power, arranged sequentially from the object side to the image side along the optical axis of the optical imaging device. The object side and image side of the first lens are concave, the object side of the third lens is convex, and the image side of the third lens is concave. An air gap exists between adjacent lenses in the lens group. The plurality of spacer elements includes at least a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. The first spacer element is located between the first and second lenses and in contact with the image-side surface of the first lens; the second spacer element is located between the second and third lenses and in contact with the image-side surface of the second lens; the third spacer element is located between the third and fourth lenses and in contact with the image-side surface of the third lens; the fourth spacer element is located between the fourth and fifth lenses and in contact with the image-side surface of the fourth lens; the fifth spacer element is located between the fifth and sixth lenses and in contact with the image-side surface of the fifth lens; the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 2.55 < (R1 - R2) / f1 < 4.65; the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element in the optical axis direction, and the center thickness CT2 of the second lens in the optical axis satisfy the following condition: 1.00. <EP01 / CT2<1.55。

[0084] The optical imaging device of this application consists of a lens barrel, six lenses and at least five spacer elements, and satisfies 2.55 < (R1-R2) / f1 < 4.65. It can be seen that in order to meet the wide-angle imaging requirements, the object side and image side of the first lens located at the front end have a large difference in curvature radius. When the temperature changes, the uneven thermal stress will cause the first lens to deform, which will lead to a large difference in the optical performance of the first lens before and after the temperature change. That is, the first lens is quite sensitive to temperature changes. Based on this, this application controls the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element in the direction of the optical axis, and the center thickness CT2 of the second lens on the optical axis, so that the edge thickness of the first lens is more reasonable, ensuring the surface stability of the first lens. When the temperature changes drastically, it can ensure that the deformation of the edge part of the first lens due to thermal expansion and contraction is small, thereby maintaining the thermal stability of the first lens. By controlling the ratio of the edge thickness of the first lens to the center thickness of the second lens on the optical axis, it ensures that the center part of the second lens is thick enough, so that the second lens can provide sufficient structural stability and thermal stability, reduce the changes in optical performance caused by the first lens, and ensure that the optical imaging device can maintain high resolution and distortion control capability even in high temperature or low temperature environments.

[0085] Of course, this embodiment may also include other parametric expressions as described in the above embodiments, which will not be elaborated here.

[0086] Optionally, the optical imaging device may further include a filter located between the sixth lens and the imaging surface.

[0087] Optionally, the aforementioned optical imaging device may further include protective glass for protecting the photosensitive element located on the imaging surface. It should be noted that each lens consists of a centrally located effective optical diameter region and an peripheral optical structure region. The optical structure region is located on the outer periphery of the effective optical diameter region and is arranged circumferentially around it. The effective optical diameter region is used for the passage of imaging light rays, while the optical structure region is not used for the passage of imaging light rays. The optical structure region is used to contact the lens barrel, adjacent lenses, or adjacent spacer elements. The optical structure region is also called the non-effective diameter region.

[0088] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0089] Figure 1A schematic diagram showing the dimensions of an optical imaging device according to this application is provided. Figure 1 The parameters d1m, D1m, D2s, D2m, d5s, d5bm, D5bm, d0s, EP01, EP12, EP23, EP45, CP5b, DT11, DT12, and DT21 are clearly and intuitively illustrated to provide a clear understanding of their meaning. To facilitate the description of the optical imaging device and the surface shape of specific lenses, these parameters will not be shown in the accompanying drawings when describing specific embodiments.

[0090] It should be noted that the object-side end face of the lens barrel refers to the surface of the lens barrel closest to the object side and perpendicular to the optical axis; the image-side end face of the lens barrel refers to the surface of the lens barrel closest to the image side and perpendicular to the optical axis; the object-side surface of the spacer element refers to the surface of the spacer element closest to the object side and perpendicular to the optical axis; and the image-side surface of the spacer element refers to the surface of the spacer element closest to the image side and perpendicular to the optical axis. DT11 is the maximum effective diameter of light allowed to pass through the object-side surface of the first lens, DT12 is the maximum effective diameter of light allowed to pass through the image-side surface of the first lens, and DT21 is the maximum effective diameter of light allowed to pass through the object-side surface of the second lens.

[0091] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of the optical imaging apparatus applicable to the above embodiments.

[0092] It should be noted that in the following Embodiment 1, there are Embodiments 1-1, 1-2, and 1-3; in Embodiment 2, there are Embodiments 2-1, 2-2, and 2-3; and in Embodiment 3, there are Embodiments 3-1, 3-2, and 3-3. In the three embodiments within the same embodiment, the parameters such as the radius of curvature, center thickness, and inter-lens spacing and higher-order coefficients of the optical imaging device from the first to the sixth lens are the same. However, the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first to fifth spacer elements, and the shape of some lenses are different. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0093] It should be noted that any of the embodiments described in Examples 1 to 3 below are applicable to all implementation methods of this application.

[0094] Example 1

[0095] like Figures 2 to 7 As shown, the optical imaging device of Embodiment 1 is described. Figure 2 A schematic diagram of the optical imaging device of Embodiment 1-1 is shown. Figure 3 A schematic diagram of the optical imaging device of Embodiments 1-2 is shown. Figure 4A schematic diagram of the optical imaging device of Embodiments 1-3 is shown.

[0096] like Figures 2 to 4 As shown, the optical imaging device includes a lens barrel P0, six lenses, and multiple spacer elements. The lens barrel P0 includes, from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a fifth auxiliary spacer element P5b, and a sixth lens E6. In this embodiment, a pressure ring is also provided on the image side of the sixth lens E6.

[0097] like Figure 2 The diagram shown is a structural schematic of the optical imaging device of Example 1-1. In this embodiment, the inner annular surface of the lens barrel P0 is stepped and gradually increases in size from the object side to the image side. The object side surface S1 of the first lens contacts the lens barrel P0; the object side surface and image side surface of the first spacer element P1 contact the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively; the object side surface and image side surface of the second spacer element P2 contact the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively; the object side surface and image side surface of the third spacer element P3 contact the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively; the object side surface and image side surface of the fourth spacer element P4 contact the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively; the object side surface and image side surface of the fifth spacer element P5 contact the image side surface S10 of the fifth lens and the object side surface of the fifth auxiliary spacer element P5b, respectively; the image side surface of the fifth auxiliary spacer element P5b contacts the object side surface S11 of the sixth lens; the object side surface of the pressure ring contacts the image side surface S12 of the sixth lens and the inner annular surface of the lens barrel P0.

[0098] like Figure 3 The diagram shown is a schematic representation of the optical imaging device in Embodiments 1-2. The contact method of each spacer element is the same as in Embodiment 1-1, and can be found in the relevant description in Embodiment 1-1, which will not be repeated here.

[0099] like Figure 4 The diagram shown is a structural schematic of the optical imaging device of Embodiments 1-3. The bearing and contact methods of each spacer element are the same as those in Embodiment 1-1, and can be referred to the relevant descriptions in Embodiment 1-1, which will not be repeated here.

[0100] In summary, the structural parameters of the optical imaging device of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 9.

[0101] In Embodiment 1, the first lens has negative optical power, and both its object-side surface S1 and image-side surface S2 are concave. The second lens has positive optical power, and both its object-side surface S3 and image-side surface S4 are concave. The third lens has negative optical power, and both its object-side surface S5 and image-side surface S6 are concave. The fourth lens has positive optical power, and both its object-side surface S7 and image-side surface S8 are concave. The fifth lens has negative optical power, and both its object-side surface S9 and image-side surface S10 are concave. The sixth lens has negative optical power, and both its object-side surface S11 and image-side surface S12 are concave. In Table 2, OBJ (not shown in the figure) is the object plane of the optical imaging device; S13 and S14 (not shown in the figure) can be the object-side and image-side surfaces of the filter or protective glass; S15 (not shown in the figure) is the imaging plane of the optical imaging device; and STO (not shown in the figure) is the aperture stop, located between the first lens E1 and the second lens E2. In other words, light rays from the object plane pass through S1 to S14 to reach the imaging plane S15 (not shown in the figure).

[0102] Table 2 shows the basic structural parameters of the optical imaging device in Embodiment 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0103] Table 2

[0104]

[0105] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the sixth lens E6 are both aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0106] Formula (1)

[0107] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R, i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 2 above; k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspherical mirror S1-S12 in Example 1.

[0108] Table 3

[0109]

[0110] Figure 5The on-axis chromatic aberration curve of the optical imaging device of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 6 The astigmatism curves of the optical imaging device of Embodiment 1 are shown, which represent the degree of curvature of the meridional image plane and the degree of curvature of the sagittal image plane at different field of view angles. Figure 7 The distortion curves of the optical imaging device of Embodiment 1 are shown, which represent the distortion magnitude values ​​corresponding to different field of view angles.

[0111] according to Figures 5 to 7 As can be seen, the optical imaging device given in Example 1 can achieve good imaging quality.

[0112] Example 2

[0113] like Figures 8 to 13 As shown, the optical imaging device of Embodiment 2 is described. Figure 8 A schematic diagram of the optical imaging device of Embodiment 2-1 is shown. Figure 9 A schematic diagram of the optical imaging device of Embodiment 2-2 is shown. Figure 10 A schematic diagram of the optical imaging device of Embodiments 2-3 is shown.

[0114] like Figures 8 to 10 As shown, the optical imaging device includes a lens barrel P0, six lenses, and multiple spacer elements. The lens barrel P0 includes, from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, a fifth auxiliary spacer element P5b, and a sixth lens E6. In this embodiment, a pressure ring is also provided on the image side of the sixth lens E6.

[0115] like Figure 8The diagram shown is a structural schematic of the optical imaging device of Example 2-1. In this embodiment, the inner annular surface of the lens barrel P0 is stepped and gradually increases in size from the object side to the image side. The object side surface S1 of the first lens contacts the lens barrel P0; the object side surface and image side surface of the first spacer element P1 contact the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively; the object side surface and image side surface of the second spacer element P2 contact the image side surface S4 of the second lens and the object side surface S5 of the third lens, respectively; the object side surface and image side surface of the third spacer element P3 contact the image side surface S6 of the third lens and the object side surface S7 of the fourth lens, respectively; the object side surface and image side surface of the fourth spacer element P4 contact the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens, respectively; the object side surface and image side surface of the fifth spacer element P5 contact the image side surface S10 of the fifth lens and the object side surface of the fifth auxiliary spacer element P5b, respectively; the image side surface of the fifth auxiliary spacer element P5b contacts the object side surface S11 of the sixth lens; the object side surface of the pressure ring contacts the image side surface S12 of the sixth lens and the inner annular surface of the lens barrel P0.

[0116] like Figure 9 The diagram shown is a structural schematic of the optical imaging device of Embodiment 2-2. The bearing and contact methods of each spacer element are the same as those in Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

[0117] like Figure 10 The diagram shown is a structural schematic of the optical imaging device of Embodiment 2-3. The contact method of each spacer element is the same as that of Embodiment 2-1, and can be referred to the relevant description in Embodiment 2-1, which will not be repeated here.

[0118] In summary, the structural parameters of the optical imaging device of Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 9.

[0119] In Embodiment 2, the first lens has negative optical power, and its object-side surface S1 and image-side surface S2 are both concave. The second lens has positive optical power, and its object-side surface S3 and image-side surface S4 are both convex. The third lens has negative optical power, its object-side surface S5 is convex, and its image-side surface S6 is concave. The fourth lens has positive optical power, its object-side surface S7 and image-side surface S8 are both convex. The fifth lens has negative optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is concave. In Table 4, OBJ (not shown in the figure) is the object plane of the optical imaging device; S13 and S14 (not shown in the figure) can be the object-side and image-side surfaces of the filter or protective glass; S15 (not shown in the figure) is the imaging plane of the optical imaging device; and STO (not shown in the figure) is the aperture stop, located between the first lens E1 and the second lens E2. In other words, light rays from the object plane pass through S1 to S14 to reach the imaging plane S15 (not shown in the figure).

[0120] Table 4 shows the basic structural parameters of the optical imaging device in Embodiment 2, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0121] Table 4

[0122]

[0123] Table 5 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1-S12 in Example 2. The aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0124] Table 5

[0125]

[0126] Figure 11 The on-axis chromatic aberration curve of the optical imaging device of Embodiment 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 12 The astigmatism curves of the optical imaging device of Embodiment 2 are shown, which represent the degree of curvature of the meridional image plane and the degree of curvature of the sagittal image plane at different field of view angles. Figure 13 The distortion curves of the optical imaging device in Embodiment 2 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles.

[0127] according to Figures 11 to 13It can be seen that the optical imaging device given in Embodiment 2 can achieve good imaging quality.

[0128] Example 3

[0129] like Figures 14 to 19 As shown, the optical imaging device of Embodiment 3 is described. Figure 14 A schematic diagram of the optical imaging device of Embodiment 3-1 is shown. Figure 15 A schematic diagram of the optical imaging device of Embodiment 3-2 is shown. Figure 16 A schematic diagram of the optical imaging device of Embodiment 3-3 is shown.

[0130] like Figures 14 to 16 As shown, the optical imaging device includes a lens barrel P0, six lenses, and multiple spacer elements. The lens barrel P0 includes, from the object side to the image side, a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a second auxiliary spacer element P2b, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth lens E5, a fifth spacer element P5, and a sixth lens E6. In this embodiment, a pressure ring is also provided on the image side of the sixth lens E6.

[0131] like Figure 14 The diagram shown is a schematic representation of the optical imaging device of Embodiment 3-1. In this embodiment, the inner annular surface of the lens barrel P0 is stepped, gradually increasing in size from the object side to the image side. The object side surface S1 of the first lens contacts the lens barrel P0; the object side surface and image side surface of the first spacer element P1 contact the image side surface S2 of the first lens and the object side surface S3 of the second lens, respectively; the object side surface and image side surface of the second spacer element P2 contact the image side surface S4 of the second lens and the object side surface of the second auxiliary spacer element P2b, respectively; the image side surface of the second auxiliary spacer element P2b contacts the object side surface S5 of the third lens; the object side surface and image side surface of the third spacer element P3... The image side of the fourth spacer element P4 contacts the image side of the third lens S6 and the object side of the fourth lens S7, respectively; the object side and image side of the fourth spacer element P4 contact the image side of the fourth lens S8 and the object side of the fourth auxiliary spacer element P4b, respectively; the image side of the fourth auxiliary spacer element P4b contacts the object side of the fifth lens S9; the object side and image side of the fifth spacer element P5 contact the image side of the fifth lens S10 and the object side of the sixth lens S11, respectively; the object side of the pressure ring contacts the image side of the sixth lens S12 and the inner ring surface of the lens barrel P0.

[0132] like Figure 15 The diagram shown is a schematic representation of the optical imaging device of Embodiment 3-2. The contact method of each spacer element is the same as that of Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0133] like Figure 16 The diagram shown is a structural schematic of the optical imaging device of Embodiment 3-3. The contact method of each spacer element is the same as that of Embodiment 3-1, and can be referred to the relevant description in Embodiment 3-1, which will not be repeated here.

[0134] In summary, the structural parameters of the optical imaging device of Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 9.

[0135] In Embodiment 3, the first lens has negative optical power, and both its object-side surface S1 and image-side surface S2 are concave. The second lens has positive optical power, and both its object-side surface S3 and image-side surface S4 are convex. The third lens has negative optical power, and both its object-side surface S5 and image-side surface S6 are concave. The fourth lens has positive optical power, and both its object-side surface S7 and image-side surface S8 are convex. The fifth lens has negative optical power, and both its object-side surface S9 and image-side surface S10 are convex. The sixth lens has negative optical power, and both its object-side surface S11 and image-side surface S12 are concave. In Table 6, OBJ (not shown in the figure) is the object plane of the optical imaging device; S13 and S14 (not shown in the figure) can be the object-side and image-side surfaces of the filter or protective glass; S15 (not shown in the figure) is the imaging plane of the optical imaging device; and STO (not shown in the figure) is the aperture stop, located between the first lens E1 and the second lens E2. In other words, light rays from the object plane pass through S1 to S14 to reach the imaging plane S15 (not shown in the figure).

[0136] Table 6 shows the basic structural parameters of the optical imaging device in Embodiment 3, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0137] Table 6

[0138]

[0139] Table 7 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S1-S12 in Example 3. The aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0140] Table 7

[0141]

[0142] Figure 17The on-axis chromatic aberration curve of the optical imaging device of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 18 The astigmatism curves of the optical imaging device of Embodiment 3 are shown, which represent the degree of curvature of the meridional image plane and the degree of curvature of the sagittal image plane at different field of view angles. Figure 19 The distortion curves of the optical imaging device of Embodiment 3 are shown, which represent the distortion magnitude values ​​corresponding to different field of view angles.

[0143] according to Figures 17 to 19 It can be seen that the optical imaging device given in Embodiment 3 can achieve good imaging quality.

[0144] In summary, the optical imaging devices of Embodiments 1 to 3 respectively satisfy the relationships shown in Table 8.

[0145] Table 8

[0146]

[0147] Table 9 shows some parameters of the optical imaging devices in Embodiments 1 to 3. Wherein, Fno is the aperture value of the optical imaging device, Semi-FOV is half of the maximum field of view of the optical imaging device, f is the effective focal length of the optical imaging device, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

[0148] Table 9

[0149]

[0150] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging device described above.

[0151] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0152] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0153] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0154] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical imaging device, characterized in that, It includes a lens barrel and a lens assembly and multiple spacer elements disposed within the lens barrel. The lens group consists of six lenses, including a first lens with negative optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with optical power, arranged sequentially from the object side to the image side along the optical axis of the optical imaging device. The object side and image side of the first lens are concave, the object side and image side of the third lens are convex, and the image side of the third lens is concave. There is an air gap between adjacent lenses in the lens group. The plurality of spacers includes at least a first spacer, a second spacer, a third spacer, a fourth spacer, and a fifth spacer. The first spacer is located between the first lens and the second lens and is in contact with the image-side surface of the first lens. The second spacer is located between the second lens and the third lens and is in contact with the image-side surface of the second lens. The third spacer is located between the third lens and the fourth lens and is in contact with the image-side surface of the third lens. The fourth spacer is located between the fourth lens and the fifth lens and is in contact with the image-side surface of the fourth lens. The fifth spacer is located between the fifth lens and the sixth lens and is in contact with the image-side surface of the fifth lens. The radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, and the effective focal length f1 of the first lens satisfy the following condition: 2.55 < (R1 - R2) / f1 < 4.65; The inner diameter d0s of the object-side end face of the lens barrel, the effective diameter DT11 of the object-side surface of the first lens, and the entrance pupil diameter EPD of the optical imaging device satisfy the following condition: 0.40 < (d0s - DT11) / EPD ≤ 0.

70.

2. The optical imaging device according to claim 1, characterized in that, The effective focal length f1 of the first lens, the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element in the direction of the optical axis, and the center thickness CT1 of the first lens on the optical axis satisfy the following condition: -67.00 <f1 / (EP01-CT1)<-13.00。 3. The optical imaging device according to claim 1, characterized in that, The outer diameter D1m of the image side of the first spacer element, the inner diameter d1m of the image side of the first spacer element, and the radius of curvature R3 of the object side of the second lens satisfy the following condition: 0.55 < (D1m - d1m) / R3 < 1.

15.

4. The optical imaging device according to claim 1, characterized in that, The outer diameter D2s of the object side of the second spacer element, the effective diameter DT12 of the image side of the first lens, the outer diameter D2m of the image side of the second spacer element, and the effective diameter DT21 of the object side of the second lens satisfy the following condition: 0.80 < (D2s - DT12) / (D2m - DT21) < 1.

00.

5. The optical imaging device according to claim 1, characterized in that, The distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first spacer element in the direction of the optical axis, and the distance EP12 between the image-side surface of the first spacer element and the object-side surface of the second spacer element in the direction of the optical axis satisfy: 0.95 < EP01 / EP12 < 1.

80.

6. The optical imaging device according to claim 1, characterized in that, The distance EP23 between the image-side surface of the second spacer element and the object-side surface of the third spacer element in the direction of the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 1.35 < EP23 / CT3 < 2.

35.

7. The optical imaging device according to claim 1, characterized in that, The central thickness CT4 of the fourth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: 2.25 < CT4 / CT5 < 3.

15.

8. The optical imaging device according to claim 1, characterized in that, The distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element in the direction of the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the effective focal length f5 of the fifth lens satisfy: -0.20 ≤ (EP45 - CT5) / f5 < 0.

9. The optical imaging device according to claim 1, characterized in that, The inner diameter d5s of the object-side surface of the fifth spacer element and the curvature radius R10 of the image-side surface of the fifth lens satisfy: -3.50 ≤ d5s / R10 < 2.

05.

10. The optical imaging apparatus according to any one of claims 1 to 9, characterized in that, When the air gap T56 between the image-side surface of the fifth lens and the object-side surface of the sixth lens on the optical axis, and the distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element in the direction of the optical axis satisfy 0.10 < T56 / EP45 < 0.65, the plurality of spacer elements further includes a fifth auxiliary spacer element, and the fifth auxiliary spacer element is located between the fifth spacer element and the sixth lens and contacts the image-side surface of the fifth spacer element.

11. The optical imaging apparatus according to any one of claims 1 to 9, characterized in that, The plurality of spacer elements further includes a fifth auxiliary spacer element, and the fifth auxiliary spacer element is located between the fifth spacer element and the sixth lens and contacts the image-side surface of the fifth spacer element. The outer diameter D5bm, the inner diameter d5bm of the image-side surface of the fifth auxiliary spacer element, and the central thickness CP5b of the fifth auxiliary spacer element on the optical axis satisfy: 1.45 < (D5bm - d5bm) / CP5b ≤ 3.30.

Images