Electronic imaging device

Abstract

The present application discloses an electronic imaging device, which includes a first imaging device and a second imaging device. Among them, the first imaging device includes a first lens system and a first electronic photosensitive element located on the imaging surface of the first lens system. The first lens system includes at least one lens with a focal power, and the lens closest to the object side among the lenses with a focal power of the first lens system has a positive focal power; the second imaging device includes a second lens system and a second electronic photosensitive element located on the imaging surface of the second lens system. The second lens system includes at least one lens with a focal power, and the lens closest to the object side among the lenses with a focal power of the second lens system has a negative focal power; wherein, the first imaging device and the second imaging device are located on the same side of the electronic imaging device, and they have different field angles; and the total effective focal length f T of the first lens system and the total effective focal length f W of the second lens system satisfy f T / f W > 3.3.

Description

Technical Field

[0001] The present application relates to an electronic imaging device, and more particularly, to an electronic imaging device including two imaging devices. Background Art

[0002] With the continuous development of the mobile phone industry, people's dependence on mobile phones has deepened day by day, and the requirements for the imaging quality of mobile phone lenses have also become higher and higher. Different from the arbitrary zoom of professional imaging equipment such as single-lens reflex cameras, the optical zoom of mobile phone lenses has been very bumpy. Traditional optical zoom involves the mechanical movement of the lens group, which will cause the total length of the lens to increase, which is contradictory to the thinning trend of current portable devices such as mobile phones.

[0003] Therefore, how to combine the current wide-angle and telephoto dual cameras to take into account the optical zoom of portable devices on the basis of not affecting the thickness of portable devices is one of the problems that need to be solved urgently in this field. Summary of the Invention

[0004] The present application provides an electronic imaging device that can at least solve or partially solve the above at least one disadvantage in the prior art. For example, an electronic imaging device that can enable high-quality optical zoom of a dual camera.

[0005] The present application provides such an electronic imaging device, which includes a first imaging device and a second imaging device. Among them, the first imaging device may include a first lens system and a first electronic photosensitive element located on the imaging surface of the first lens system. The first lens system may include at least one lens having a focal power, and the lens closest to the object side has a positive focal power; the second imaging device may include a second lens system and a second electronic photosensitive element located on the imaging surface of the second lens system. The second lens system may include at least one lens having a focal power, and the lens closest to the object side has a negative focal power. Among them, the first imaging device and the second imaging device are located on the same side of the electronic imaging device, and the first imaging device and the second imaging device have different field of view angles.

[0006] In one embodiment, the total effective focal length f of the first lens system T and the total effective focal length f of the second lens system W may satisfy f T / f W > 3.3.

[0007] In one embodiment, the maximum semi-field of view Semi-FOV of the first lens system T may satisfy 20° < Semi-FOV T < 25°.

[0008] In one embodiment, the maximum semi-field of view Semi-FOV of the second lens system W satisfies 50° < Semi-FOV W < 55°.

[0009] In one embodiment, the distance TTL on the optical axis of the object side surface of the lens closest to the object side of the first lens system to the imaging surface of the first lens system T and the total effective focal length f of the first lens system T satisfy TTL T / f T < 0.9.

[0010] In one embodiment, half of the diagonal length ImgH of the effective pixel region on the imaging surface of the first lens system T and the total effective focal length f of the first lens system T satisfy ImgH T / f T < 0.5.

[0011] In one embodiment, the distance TTL on the optical axis of the object side surface of the lens closest to the object side of the second lens system to the imaging surface of the second lens system W and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the second lens system W satisfy TTL W / ImgH W < 1.9.

[0012] In one embodiment, the total effective focal length f of the second lens system W and the entrance pupil diameter EPD of the second lens system W satisfy f W / EPD W < 2.2.

[0013] In one embodiment, in the first lens system, there is an air gap between any two adjacent lenses; and in the second lens system, there is an air gap between any two adjacent lenses.

[0014] In one embodiment, the first imaging device and the second imaging device are arranged longitudinally or horizontally on one side of the electronic imaging device.

[0015] In one embodiment, the first lens system may sequentially include, along the optical axis of the first lens system from the object side to the imaging surface of the first lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, the effective focal length f2 of the second lens of the first lens system T , the effective focal length f5 of the fifth lens of the first lens systemT The effective focal length f4 of the fourth lens of the first lens system T can satisfy 0.4 < (f2 T + f5 T ) / f4 T < 0.7.

[0016] In one embodiment, the first lens system may sequentially include, along the optical axis of the first lens system from the object side to the imaging surface of the first lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, the radius of curvature R11 of the object side surface of the sixth lens of the first lens system T and the radius of curvature R12 of the image side surface of the sixth lens of the first lens system T can satisfy 0.8 < R11 T / R12 T < 1.3.

[0017] In one embodiment, the first lens system may sequentially include, along the optical axis of the first lens system from the object side to the imaging surface of the first lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, the combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens of the first lens system T , the radius of curvature R1 of the object side surface of the first lens of the first lens system T and the radius of curvature R2 of the image side surface of the first lens of the first lens system T can satisfy 0.3 < f1234 T / (R1 T + R2 T ) < 0.6.

[0018] In one embodiment, the first lens system may sequentially include, along the optical axis of the first lens system from the object side to the imaging surface of the first lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, the fifth lens of the first lens system has a negative optical power, its object side surface is concave, and its image side surface is concave.

[0019] In one embodiment, the first lens system may sequentially include, along the optical axis of the first lens system from the object side to the imaging surface of the first lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, at least four lenses among the first lens to the sixth lens of the first lens system are lenses made of plastic material.

[0020] In one embodiment, the second lens system may sequentially include, from the object side along the optical axis of the second lens system to the imaging surface of the second lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, the total effective focal length f of the second lens system W and the effective focal length f5 of the fifth lens of the second lens system W may satisfy 0.4 ≤ f W / f5 W ≤ 1.8.

[0021] In one embodiment, the second lens system may sequentially include, from the object side along the optical axis of the second lens system to the imaging surface of the second lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, the radius of curvature R2 of the image side surface of the first lens of the second lens system W and the radius of curvature R1 of the object side surface of the first lens of the second lens system W may satisfy 0.2 < R2 W / R1 W <0.6.

[0022] In one embodiment, the second lens system may sequentially include, from the object side along the optical axis of the second lens system to the imaging surface of the second lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, the radius of curvature R8 of the image side surface of the fourth lens of the second lens system W and the radius of curvature R7 of the object side surface of the fourth lens in the second lens system W may satisfy 0.3 < R8 W / R7 W <1.0.

[0023] In one embodiment, the second lens system may sequentially include, from the object side along the optical axis of the second lens system to the imaging surface of the second lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, the image side surface of the second lens of the second lens system is a convex surface; and the fifth lens of the second lens system has a positive optical power, its object side surface is a concave surface, and its image side surface is a convex surface.

[0024] In one embodiment, the second lens system may sequentially include, from the object side along the optical axis of the second lens system to the imaging surface of the second lens system: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Further, at least four of the first lens to the sixth lens of the second lens system are lenses made of plastic material.

[0025] In this application, by providing two different imaging devices in an electronic imaging device and reasonably allocating the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens in the two imaging devices, etc., the above-mentioned electronic imaging device has at least the following beneficial effects: while ensuring the miniaturization of the electronic imaging device, the imaging effect of hybrid optical zoom can be achieved by alternately using different imaging modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] With reference to the accompanying drawings, through the following detailed description of non-limiting embodiments, other features, objects, and advantages of this application will become more apparent. In the drawings:

[0027] Figure 1 FIG. shows a schematic structural diagram of a first lens system according to Embodiment 1 of this application;

[0028] Figures 2A to 2D FIGS. respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the first lens system of Embodiment 1;

[0029] Figure 3 FIG. shows a schematic structural diagram of a first lens system according to Embodiment 2 of this application;

[0030] Figures 4A to 4D FIGS. respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the first lens system of Embodiment 2;

[0031] Figure 5 FIG. shows a schematic structural diagram of a first lens system according to Embodiment 3 of this application;

[0032] Figures 6A to 6D FIGS. respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the first lens system of Embodiment 3;

[0033] Figure 7 FIG. shows a schematic structural diagram of a first lens system according to Embodiment 4 of this application;

[0034] Figures 8A to 8D FIGS. respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the first lens system of Embodiment 4;

[0035] Figure 9 FIG. shows a schematic structural diagram of a second lens system according to Embodiment 5 of this application;

[0036] Figures 10A to 10D FIGS. respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the second lens system of Embodiment 5;

[0037] Figure 11 Shows a schematic structural diagram of a second lens system according to Embodiment 6 of the present application;

[0038] Figures 12A to 12D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the second lens system of Embodiment 6;

[0039] Figure 13 Shows a schematic structural diagram of a second lens system according to Embodiment 7 of the present application;

[0040] Figures 14A to 14D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the second lens system of Embodiment 7;

[0041] Figure 15 Shows a schematic structural diagram of a second lens system according to Embodiment 8 of the present application;

[0042] Figures 16A to 16D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the second lens system of Embodiment 8;

[0043] Figure 17 and Figure 18 Shows a schematic diagram of different arrangement modes of the first and second imaging devices according to the present application. Detailed implementation manners

[0044] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0045] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens, and the first imaging device may also be referred to as the second imaging device.

[0046] In the accompanying drawings, for the sake of convenience of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only for illustration and are not drawn strictly to scale.

[0047] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0048] It should also be understood that the terms "comprising", "including", "having", "containing" and / or "including", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features, rather than an individual element in the list. In addition, when describing embodiments of the present application, the use of "may" indicates "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0049] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0050] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will refer to the drawings and describe the present application in detail in combination with the embodiments.

[0051] The features, principles and other aspects of the present application will be described in detail below.

[0052] An electronic imaging device according to an exemplary embodiment of the present application may include a first imaging device and a second imaging device. Among them, the first imaging device includes a first lens system and a first electronic photosensitive element located on the imaging surface of the first lens system, and the second imaging device includes a second lens system and a second electronic photosensitive element located on the imaging surface of the second lens system. The first lens system may include at least one lens having a focal power, and the lens closest to the object side has a positive focal power. The second lens system may include at least one lens having a focal power, and the lens closest to the object side has a negative focal power.

[0053] In an exemplary embodiment, the first imaging device and the second imaging device may be located on the same side of the electronic imaging device, so that both can capture an object located on the same side of the electronic imaging device (for example, in front of or behind the electronic imaging device).

[0054] In an exemplary embodiment, the first imaging device and the second imaging device may have different field of view angles. For example, the field of view angle of the second imaging device may be smaller than that of the first imaging device. In an exemplary embodiment, the first imaging device may have a telephoto characteristic, and the second imaging device may have a wide-angle characteristic. The combination of the two can form a wide-angle and telephoto dual camera lens. Thus, in the electronic imaging device, the effect of hybrid optical zoom can be achieved by alternately using the two types of imaging devices, which helps to promote the development of the lossless zoom technology of electronic imaging devices such as mobile phones. In an exemplary embodiment, the electronic imaging device of the present application may satisfy the conditional 20° < Semi-FOV T < 25° and 50° < Semi-FOV W < 55°, where Semi-FOV T is the maximum half field of view angle of the first lens system, and Semi-FOV W is the maximum half field of view angle of the second lens system. More specifically, Semi-FOV T may further satisfy 20° < Semi-FOV T < 23°, for example 20.8° ≤ Semi-FOV T ≤ 21.3°, and Semi-FOV W may further satisfy 51° < Semi-FOV W < 53°, for example 52.0° ≤ Semi-FOV W ≤ 52.3°. By reasonably controlling the field of view angle of the first lens system, it can ensure that the edge field of view has a high resolution during long-distance shooting, and can also ensure that the system has a high relative brightness; on the premise of ensuring the miniaturization of the lens, by controlling the field of view angle of the second lens system, the problems of excessive aberration and low illuminance in the edge field of view can be effectively avoided, ensuring that the electronic imaging device can have excellent imaging quality within a relatively wide field of view.

[0055] In an exemplary embodiment, the electronic imaging device of the present application may satisfy the conditional f T / f W > 3.3, where f T is the total effective focal length of the first lens system, and f W is the total effective focal length of the second lens system. More specifically, referring to Table 3 and Table 9 below, selecting a combination of a first lens system with f T = 6.75 mm and a second lens system with f W = 1.99 mm can make fT and f W Further, it can satisfy f T / f W ≥3.39. Satisfying the conditional formula f T / f W >3.3 can make the combined zoom lens of the present application have a high zoom ratio, and at the same time can ensure its thinness, so as to meet more imaging requirements in the market.

[0056] In an exemplary embodiment, the first imaging device and the second imaging device may be arranged longitudinally or horizontally on one side of the electronic imaging device. By arranging them longitudinally or horizontally, the first and second imaging devices are adjacent to each other. On the one hand, the chips placed inside the electronic imaging device can be arranged more regularly, making it easier to arrange and wire the internal components; on the other hand, it can increase the aesthetic appearance, and it is more convenient for users to hold the device to take pictures without the user having to overly consider whether a certain camera is blocked due to improper holding posture. It should be understood that "longitudinal arrangement" can be understood as, for example, Figure 17 as shown in, the first imaging device A and the second imaging device B are arranged vertically with respect to the use direction of the electronic imaging device, and "horizontal arrangement" can be understood as, for example, Figure 18 as shown in, the first imaging device A and the second imaging device B are arranged horizontally with respect to the use direction of the electronic imaging device. At the same time, it should also be understood that the arrangement manner of the first imaging device and the second imaging device is not limited to this, and their relative positions can be adjusted according to actual design needs.

[0057] In an exemplary embodiment, the electronic imaging device may be, for example, an independent imaging device such as a digital camera, or an imaging device integrated on a mobile electronic device such as a mobile phone. The electronic photosensitive element carried by the first imaging device or the second imaging device may be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor element (CMOS).

[0058] The following will describe in detail the first lens system and the second lens system applicable to the electronic imaging device according to the present application.

[0059] (1) The first lens system

[0060] The first lens system according to the present application may include at least one lens having a focal power, and the lens closest to the object side has a positive focal power. For example, the first lens system may include six lenses having a focal power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and these six lenses are arranged in sequence from the object side to the image side along the optical axis. Making the lens closest to the object side of the first lens system (i.e., the first lens) have a positive focal power is beneficial to the distribution of the focal power of the entire system, avoids excessive concentration of the focal power, and at the same time helps the first lens system to balance the lateral chromatic aberration and the longitudinal chromatic aberration.

[0061] In an exemplary embodiment, the second lens in the first lens system may have a negative focal power, its object side surface may be convex, and its image side surface may be concave.

[0062] In an exemplary embodiment, the object side surface of the third lens in the first lens system may be convex, and its image side surface may be concave.

[0063] In an exemplary embodiment, the fourth lens in the first lens system may have a negative focal power, its object side surface may be convex, and its image side surface may be concave.

[0064] In an exemplary embodiment, the fifth lens in the first lens system may have a negative focal power, its object side surface may be concave, and its image side surface may be concave. Designing the fifth lens of the first lens system to have a negative focal power can effectively correct various aberrations generated by the first lens to the fourth lens; designing both its object side surface and image side surface to be concave can make it have better refractive power, enable the light rays of the first lens system to be incident on a larger image surface, and can have a smaller chief ray angle (CRA), thereby better matching the system chip.

[0065] In an exemplary embodiment, the electronic imaging device of the present application may satisfy conditional TTL T / f T <0.9, where TTL T is the distance from the object side surface of the first lens of the first lens system to the imaging surface of the first lens system on the optical axis of the first lens system, and f T is the total effective focal length of the first lens system. More specifically, TTL T and f T may further satisfy 0.8 < TTL T / f T <0.9, for example 0.83 ≤ TTL T / f T ≤0.85. Satisfying the conditional TTL T / f T<0.9, the total effective focal length of the first lens system can be elongated as much as possible while meeting the structural requirements of the total lens length, and the optical zoom ratio of the electronic imaging device can be increased.

[0066] In an exemplary embodiment, the electronic imaging device of the present application can meet the conditional formula 0.4 < (f2 T + f5 T ) / f4 T < 0.7, where f2 T is the effective focal length of the second lens of the first lens system, f5 T is the effective focal length of the fifth lens of the first lens system, and f4 T is the effective focal length of the fourth lens of the first lens system. More specifically, f2 T , f5 T and f4 T further can meet 0.46 ≤ (f2 T + f5 T ) / f4 T ≤ 0.65. Meeting the conditional formula 0.4 < (f2 T + f5 T ) / f4 T < 0.7 can reasonably distribute the optical power of the second lens, the fourth lens, and the fifth lens in the first lens system, thereby reducing the deflection angle of light rays, reducing the sensitivity of the first lens system, reducing the optical distortion of the first lens system, and improving the relative brightness of the edge.

[0067] In an exemplary embodiment, the electronic imaging device of the present application can meet the conditional formula ImgH T / f T < 0.5, where ImgH T is half of the diagonal length of the effective pixel area on the imaging surface of the first lens system, and f T is the total effective focal length of the first lens system. More specifically, ImgH T and f T further can meet 0.3 < ImgH T / f T < 0.5, for example 0.39 ≤ ImgH T / f T ≤ 0.40. Meeting the conditional formula ImgH T / f T < 0.5 can effectively improve the telephoto ratio of the first lens system, increase the shooting magnification, and improve the imaging quality of the electronic imaging device.

[0068] In an exemplary embodiment, the electronic imaging device of the present application can meet the conditional formula 0.8 < R11 T / R12 T<1.3, where R11 T is the radius of curvature of the object side surface of the sixth lens of the first lens system, and R12 T is the radius of curvature of the image side surface of the sixth lens of the first lens system. More specifically, R11 T and R12 T further satisfy 0.93 ≤ R11 T / R12 T ≤ 1.22. Satisfying the conditional expression 0.8 < R11 T / R12 T < 1.3 can optimize the curvature of the sixth lens of the first lens system, reduce the axial chromatic aberration of this first lens system, and at the same time improve the optical modulation transfer function (MTF) value of the off-axis field of view, meeting higher imaging requirements. Optionally, the object side surface of the sixth lens of the first lens system can be concave, and the image side surface can be convex.

[0069] In an exemplary embodiment, the electronic imaging device of the present application can satisfy the conditional expression 0.3 < f1234 T / (R1 T + R2 T ) < 0.6, where f1234 T is the combined focal length of the first lens, the second lens, the third lens, and the fourth lens of the first lens system, R1 T is the radius of curvature of the object side surface of the first lens of the first lens system, and R2 T is the radius of curvature of the image side surface of the first lens of the first lens system. More specifically, f1234 T , R1 T and R2 T further satisfy 0.41 ≤ f1234 T / (R1 T + R2 T ) ≤ 0.44. Satisfying the conditional expression 0.3 < f1234 T / (R1 T + R2 T ) < 0.6 can effectively increase the total effective focal length of the first lens system, reasonably distribute the optical power of the first lens, and reduce the sensitivity of actual part processing. Optionally, the object side surface of the first lens of the first lens system can be convex, and the image side surface can be concave.

[0070] In an exemplary embodiment, at least four of the first lens to the sixth lens in the first lens system can be made of plastic material. On the basis of considering the imaging quality, using more plastic materials is more conducive to the shaping and processing of the lens, reducing processing errors, controlling the system cost, and facilitating mass production.

[0071] In an exemplary embodiment, in the first lens system, there may be an air gap between any two adjacent lenses. Having a certain amount of air gap between adjacent lenses can ensure that the adjacent lenses do not contact each other within the machining tolerances of the lens, thereby avoiding lens wear or cracking.

[0072] In an exemplary embodiment, the above-mentioned first lens system may further include at least one aperture stop. The aperture stop can be disposed at an appropriate position as needed, for example, between the object side and the first lens. Optionally, the above-mentioned first lens system may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0073] The first lens system according to the above embodiment of the present application may employ multiple lenses, such as the six lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the on-axis spacing between each lens, etc., the volume of the first lens system can be effectively reduced, the sensitivity of the first lens system can be lowered, and the processability of the first lens system can be improved, making the first lens system more conducive to production and processing and applicable to portable electronic imaging devices.

[0074] In an embodiment of the present application, at least one of the mirror surfaces of each lens in the first lens system is an aspherical mirror surface, that is, at least one of the object side and the image side of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, both the object side and the image side of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens in the first lens system are aspherical mirror surfaces.

[0075] The following will refer to Figures 1 to 8D to further describe multiple embodiments of the first lens system according to the present application.

[0076] Example 1

[0077] The following refers to Figures 1 to 2D to describe the first lens system according to Embodiment 1 of the present application. Figure 1 FIG. shows a schematic structural diagram of the first lens system according to Embodiment 1 of the present application.

[0078] As Figure 1As shown, the first lens system sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0079] The first lens E1 has a positive optical power. Its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative optical power. Its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive optical power. Its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a negative optical power. Its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a negative optical power. Its object surface S9 is concave, and its image surface S10 is concave. The sixth lens E6 has a positive optical power. Its object surface S11 is concave, and its image surface S12 is convex. The filter E7 has an object surface S13 and an image surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15. In this embodiment, the first lens E1 to the sixth lens E6 can all be lenses made of plastic material.

[0080] Although not shown, an aperture can be provided between the object side and the first lens E1 to further improve the imaging quality of the lens.

[0081] Table 1 shows the basic parameter table of the first lens system of Embodiment 1, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0082]

[0083] Table 1

[0084] Among them, f T is the total effective focal length of the first lens system, TTL T is the distance on the optical axis of the first lens system from the object surface S1 of the first lens E1 of the first lens system to the imaging surface S15 of the first lens system, ImgH T is half of the diagonal length of the effective pixel region on the imaging surface S15 of the first lens system, and Semi - FOV T is the maximum half - field - of - view angle of the first lens system.

[0085] In Embodiment 1, the object surface and the image surface of any one of the first lens E1 to the sixth lens E6 of the first lens system are both aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0086]

[0087] Wherein, x is the sagitta, which is the distance from the vertex of the aspheric surface to the position along the optical axis at a height of h; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the higher-order coefficients A 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 and A 20 .

[0088] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 6.7160E-03 -1.3490E-02 6.6504E-02 -1.6354E-01 2.4724E-01 -2.2645E-01 1.2145E-01 -3.4380E-02 3.7820E-03 S2 1.2553E-02 1.2382E-02 1.3709E-02 -5.4900E-02 3.6557E-02 3.3888E-02 -7.3120E-02 4.3187E-02 -8.6300E-03 S3 -4.4020E-02 1.5397E-01 -3.3377E-01 1.1016E+00 -2.6169E+00 3.8196E+00 -3.3113E+00 1.5531E+00 -3.0051E-01 S4 -6.9360E-02 2.9720E-01 -1.0376E+00 3.2839E+00 -2.9779E+00 -9.4976E+00 3.0793E+01 -3.3957E+01 1.3707E+01 S5 -2.7050E-02 -4.9290E-02 7.9855E-01 -3.5589E+00 1.3577E+01 -3.2546E+01 4.5362E+01 -3.4024E+01 1.0614E+01 S6 4.1387E-02 -1.1792E-01 4.4116E-01 -4.7897E-01 4.5252E+00 -1.9177E+01 3.7649E+01 -3.6136E+01 1.3522E+01 S7 4.9905E-02 -3.3618E-01 5.5449E-01 6.1183E-01 -3.2176E+00 5.4858E+00 -4.3011E+00 1.0649E+00 1.5022E-01 S8 1.9842E-02 -4.1903E-01 2.1891E+00 -9.2424E+00 2.6763E+01 -4.8529E+01 5.2897E+01 -3.1449E+01 7.7821E+00 S9 -2.5097E-01 1.5840E-01 1.0544E-02 -3.2875E-01 4.1601E-01 -2.5835E-01 5.6970E-02 1.3078E-02 -5.5100E-03 S10 -2.0190E-01 2.1286E-01 -1.3960E-01 1.6912E-02 4.4000E-02 -4.1450E-02 1.7989E-02 -3.8900E-03 3.2400E-04 S11 -2.9460E-02 -4.0900E-03 3.7894E-02 -2.5700E-02 8.5630E-03 -1.6900E-03 2.0600E-04 -1.5000E-05 4.8400E-07 S12 -4.0340E-02 7.9200E-05 6.7840E-03 -6.6500E-03 5.1520E-03 -2.0800E-03 4.3500E-04 -4.6000E-05 1.9100E-06

[0089] Table 2

[0090] Figure 2A shows the axial chromatic aberration curve of the first lens system of Example 1, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens. Figure 2B shows the astigmatism curve of the first lens system of Example 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 2C shows the distortion curve of the first lens system of Example 1, which represents the distortion magnitude values corresponding to different field angles. Figure 2D shows the longitudinal chromatic aberration curve of the first lens system of Example 1, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 2A to 2D it can be seen that the first lens system given in Example 1 can achieve good imaging quality.

[0091] Example 2

[0092] The following will refer to Figures 3 to 4D to describe the first lens system according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Example 1 will be omitted. Figure 3 shows a schematic structural diagram of the first lens system according to Embodiment 2 of the present application.

[0093] As Figure 3 shown, the first lens system sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0094] The first lens E1 has a positive optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a negative optical power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a negative optical power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a negative optical power, its object side S7 is convex, and its image side S8 is concave. The fifth lens E5 has a negative optical power, its object side S9 is concave, and its image side S10 is concave. The sixth lens E6 has a positive optical power, its object side S11 is concave, and its image side S12 is convex. The filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15. In this embodiment, the first lens E1 to the sixth lens E6 can all be lenses made of plastic material.

[0095] Although not shown, a diaphragm can be provided between the object side and the first lens E1 to further improve the imaging quality of the lens.

[0096] Table 3 shows the basic parameter table of the first lens system of Embodiment 2, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 4 shows the high-order term coefficients of the aspherical mirrors that can be used in Embodiment 2, where each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.

[0097]

[0098] Table 3

[0099] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 6.4800E-03 -1.2569E-02 6.5813E-02 -1.7110E-01 2.6966E-01 -2.5619E-01 1.4271E-01 -4.2287E-02 4.9735E-03 S2 1.2961E-02 1.2828E-02 9.8735E-03 -3.7803E-02 -6.4575E-03 9.7384E-02 -1.2791E-01 6.8116E-02 -1.3184E-02 S3 -4.5599E-02 1.6591E-01 -3.6636E-01 1.1992E+00 -2.8928E+00 4.2927E+00 -3.7811E+00 1.8027E+00 -3.5489E-01 S4 -7.6905E-02 4.2672E-01 -2.2815E+00 1.0693E+01 -2.9182E+01 4.6012E+01 -3.8625E+01 1.3254E+01 2.3605E-01 S5 -4.2388E-02 1.0441E-01 -2.8304E-01 2.1834E+00 -6.4020E+00 1.0464E+01 -9.9214E+00 4.7702E+00 -7.6560E-01 S6 3.2864E-02 -1.3567E-01 9.4035E-01 -2.8065E+00 8.1478E+00 -1.6866E+01 2.2141E+01 -1.6896E+01 5.6358E+00 S7 7.7033E-02 -5.0300E-01 1.3051E+00 -2.6506E+00 4.9086E+00 -6.1453E+00 4.7242E+00 -2.1232E+00 4.3515E-01 S8 6.1315E-02 -2.8754E-01 2.7377E-01 3.0724E-01 -9.8342E-01 1.0374E+00 -2.9771E-01 -2.2728E-01 1.2409E-01 S9 -1.5306E-01 1.6384E-01 -4.5416E-01 6.3430E-01 -6.2050E-01 4.1394E-01 -1.8015E-01 4.7307E-02 -5.6342E-03 S10 -9.9774E-02 1.5142E-01 -2.8964E-01 2.9079E-01 -1.7555E-01 6.3489E-02 -1.2533E-02 1.0050E-03 6.8646E-06 S11 -6.1604E-02 9.2568E-02 -7.3939E-02 3.7593E-02 -1.2734E-02 2.8689E-03 -4.1114E-04 3.3713E-05 -1.1988E-06 S12 -6.5648E-02 3.6134E-02 -2.0280E-02 6.8242E-03 -7.2436E-04 -2.0602E-04 7.4209E-05 -8.8033E-06 3.7733E-07

[0100] Table 4

[0101] Figure 4A Shows the axial chromatic aberration curve of the first lens system of Embodiment 2, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 4B Shows the astigmatism curve of the first lens system of Embodiment 2, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C Shows the distortion curve of the first lens system of Embodiment 2, which represents the distortion magnitude values corresponding to different field angles. Figure 4D Shows the lateral chromatic aberration curve of the first lens system of Embodiment 2, which represents the deviation of different image heights of light rays on the imaging surface after passing through the lens. According to Figures 4A to 4D It can be seen that the first lens system given in Embodiment 2 can achieve good imaging quality.

[0102] Example 3

[0103] The following refers to Figures 5 to 6D Describes the first lens system according to Embodiment 3 of the present application.Figure 5 Shows a schematic structural diagram of a first lens system according to Embodiment 3 of the present application.

[0104] As Figure 5 shown, the first lens system sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0105] The first lens E1 has a positive optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a negative optical power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has a negative optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a negative optical power, its object side surface S9 is concave, and its image side surface S10 is concave. The sixth lens E6 has a positive optical power, its object side surface S11 is concave, and its image side surface S12 is convex. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15. In this embodiment, the first lens E1 to the sixth lens E6 can all be lenses made of plastic material.

[0106] Although not shown, a diaphragm can be provided between the object side and the first lens E1 to further improve the imaging quality of the lens.

[0107] Table 5 shows the basic parameter table of the first lens system of Embodiment 3, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 6 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 3, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0108]

[0109] Table 5

[0110]

[0111]

[0112] Table 6

[0113] Figure 6A Shows the axial chromatic aberration curve of the first lens system of Embodiment 3, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 6B Shows the astigmatism curve of the first lens system of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6CThe distortion curve of the first lens system of Embodiment 3 is shown, which represents the distortion magnitude values corresponding to different field angles of view. Figure 6D The longitudinal chromatic aberration curve of the first lens system of Embodiment 3 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 6A to 6D it can be known that the first lens system given in Embodiment 3 can achieve good imaging quality.

[0114] Example 4

[0115] The following refers to Figures 7 to 8D the first lens system according to Embodiment 4 of the present application is described. Figure 7 The structural schematic diagram of the first lens system according to Embodiment 4 of the present application is shown.

[0116] As Figure 7 shown, the first lens system sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0117] The first lens E1 has a positive optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative optical power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a positive optical power, its object surface S5 is convex, and its image surface S6 is concave. The fourth lens E4 has a negative optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a negative optical power, its object surface S9 is concave, and its image surface S10 is concave. The sixth lens E6 has a positive optical power, its object surface S11 is concave, and its image surface S12 is convex. The filter E7 has an object surface S13 and an image surface S14. Light from the object sequentially passes through each surface S1 to S14 and finally forms an image on the imaging surface S15. In this embodiment, the first lens E1 to the sixth lens E6 can all be lenses made of plastic material.

[0118] Although not shown, a diaphragm can be provided between the object side and the first lens E1 to further improve the imaging quality of the lens.

[0119] Table 7 shows the basic parameter table of the first lens system of Embodiment 4, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 8 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 4, where each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.

[0120]

[0121]

[0122] Table 7

[0123] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 6.8310E-03 -1.3350E-02 6.6675E-02 -1.6405E-01 2.4743E-01 -2.2586E-01 1.2079E-01 -3.4120E-02 3.7410E-03 S2 1.2498E-02 1.2395E-02 1.3554E-02 -5.4380E-02 3.5910E-02 3.4189E-02 -7.2970E-02 4.3019E-02 -8.5900E-03 S3 -4.4190E-02 1.5422E-01 -3.3610E-01 1.1198E+00 -2.6753E+00 3.9224E+00 -3.4128E+00 1.6062E+00 -3.1194E-01 S4 -6.8200E-02 2.7797E-01 -8.5582E-01 2.3192E+00 2.4715E-01 -1.6356E+01 3.9833E+01 -4.0666E+01 1.5849E+01 S5 -2.8010E-02 -4.3460E-02 7.4265E-01 -3.0449E+00 1.1401E+01 -2.7519E+01 3.8824E+01 -2.9577E+01 9.3915E+00 S6 3.5374E-02 -5.3610E-02 -1.1906E-01 2.8622E+00 -7.2976E+00 6.1962E+00 5.3666E+00 -1.3944E+01 7.2010E+00 S7 4.3539E-02 -2.9119E-01 2.8706E-01 1.9143E+00 -7.1050E+00 1.2729E+01 -1.2473E+01 6.1060E+00 -1.1474E+00 S8 1.6076E-02 -3.7053E-01 1.7946E+00 -7.3827E+00 2.1561E+01 -3.9686E+01 4.3986E+01 -2.6572E+01 6.6661E+00 S9 -1.9939E-01 9.0724E-02 9.0106E-02 -4.8351E-01 6.9199E-01 -5.6109E-01 2.4811E-01 -5.0900E-02 3.2270E-03 S10 -1.6234E-01 1.4609E-01 -5.2640E-02 -9.0430E-02 1.4573E-01 -1.0506E-01 4.2339E-02 -9.0500E-03 7.8800E-04 S11 -5.1010E-02 2.4819E-02 1.3295E-02 -1.2750E-02 4.2550E-03 -7.8000E-04 8.6300E-05 -5.6000E-06 1.7100E-07 S12 -3.7890E-02 -3.6400E-03 1.0956E-02 -9.2300E-03 5.9000E-03 -2.1400E-03 4.1900E-04 -4.2000E-05 1.6700E-06

[0124] Table 8

[0125] Figure 8A The axial chromatic aberration curve of the first lens system of Embodiment 4 is shown, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens. Figure 8B The astigmatism curve of the first lens system of Embodiment 4 is shown, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 8C The distortion curve of the first lens system of Embodiment 4 is shown, which represents the distortion magnitude values corresponding to different field angles. Figure 8D The lateral chromatic aberration curve of the first lens system of Embodiment 4 is shown, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 8A to 8D it can be seen that the first lens system given in Embodiment 4 can achieve good imaging quality.

[0126] (2) The second lens system

[0127] The second lens system according to the present application may include at least one lens having a focal power, and the lens closest to the object side has a negative focal power. For example, the second lens system may include six lenses having a focal power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. These six lenses are arranged in sequence along the optical axis from the object side to the image side. Making the lens closest to the object side of the second lens system (for example, the first lens) have a negative focal power can increase the field angle of the second lens system, slow down the incident angle of light on the second lens, and at the same time can also reduce the aperture of the subsequent lenses, which helps to maintain the miniaturization of the lens.

[0128] In an exemplary embodiment, the image side surface of the second lens in the second lens system may be convex. Making the image side surface of the second lens in the second lens system convex is beneficial to reducing the edge distortion of the second lens system and can improve the relative edge brightness of the second lens system.

[0129] In an exemplary embodiment, the image side surface of the third lens in the second lens system may be convex.

[0130] In an exemplary embodiment, the fifth lens in the second lens system may have a positive focal power, its object side surface may be concave, and its image side surface may be convex. Making the fifth lens in the second lens system have a positive focal power can effectively correct and balance the aberration generated by the first lens to the fourth lens; designing its object side surface to be concave helps to correct chromatic aberration through the thickness at different aperture heights; and configuring its image side surface to be convex can effectively diverge light, enabling the second lens system to have a large image plane.

[0131] In an exemplary embodiment, the object side surface of the sixth lens in the second lens system may be convex, and the image side surface may be concave.

[0132] In an exemplary embodiment, the electronic imaging device of the present application may satisfy the conditional formula 0.4 ≤ f W / f5 W ≤ 1.8, where f W is the total effective focal length of the second lens system, and f5 W is the effective focal length of the fifth lens of the second lens system. More specifically, f W and f5 W may further satisfy 0.40 ≤ f W / f5 W ≤ 1.79. Satisfying the conditional formula 0.4 ≤ f W / f5 W ≤ 1.8 can reduce the optical distortion of the second lens system and can improve the refractive power of the fifth lens of the second lens system, enabling the second lens system to better match the chief ray angle (CRA) of the chip.

[0133] In an exemplary embodiment, the electronic imaging device of the present application may satisfy the conditional formula 0.2 < R2 W / R1 W < 0.6, where R2 W is the radius of curvature of the image side surface of the first lens of the second lens system, and R1 W is the radius of curvature of the object side surface of the first lens of the second lens system. More specifically, R2 W and R1 W may further satisfy 0.39 ≤ R2 W / R1 W ≤ 0.50. Satisfying the conditional formula 0.2 < R2 W / R1 W < 0.6 can optimize the curvature of the first lens of the second lens system, enabling the second lens system to more easily balance the field curvature and distortion and enabling the second lens system to obtain a larger field of view angle. Optionally, the object side surface of the first lens of the second lens system may be convex, and the image side surface may be concave.

[0134] In an exemplary embodiment, the electronic imaging device of the present application may satisfy the conditional formula 0.3 < R8 W / R7 W < 1.0, where R8 W is the radius of curvature of the image side surface of the fourth lens of the second lens system, and R7 W is the radius of curvature of the object side surface of the fourth lens in the second lens system. More specifically, R8 W and R7 W may further satisfy 0.40 ≤ R8W / R7 W ≤0.96. The condition 0.3 < R8 W / R7 W <1.0 can optimize the curvature of the fourth lens of the second lens system to balance various aberrations, contract paraxial rays, improve the MTF value of the on-axis field of view, and improve the imaging quality. Optionally, the object side of the fourth lens of the second lens system can be convex and the image side can be concave.

[0135] In an exemplary embodiment, the electronic imaging device of the present application can satisfy the condition TTL W / ImgH W <1.9, where TTL W is the distance from the object side of the first lens of the second lens system to the imaging surface of the second lens system on the optical axis of the second lens system, and ImgH W is half of the diagonal length of the effective pixel region on the imaging surface of the second lens system. More specifically, TTL W and ImgH W can further satisfy 1.8 < TTL W / ImgH W <1.9, for example 1.86 ≤ TTL W / ImgH W ≤1.88. Satisfying the condition TTL W / ImgH W <1.9 can effectively compress the size of the second lens system and ensure the compact size characteristics of the lens.

[0136] In an exemplary embodiment, the electronic imaging device of the present application can satisfy the condition f W / EPD W <2.2, where f W is the total effective focal length of the second lens system, and EPD W is the entrance pupil diameter of the second lens system. More specifically, f W and EPD W For example, can further satisfy f W / EPD W =2.19. Satisfying the condition f W / EPD W <2.2 can give the second lens system the advantage of a large aperture, enhance the imaging effect of the second lens system in a low-light environment, and also reduce the aberrations of the marginal field of view.

[0137] In an exemplary embodiment, at least four lenses among the first lens to the sixth lens in the second lens system may be made of plastic. Considering the imaging quality, using more plastic materials is more conducive to the forming and processing of the lenses, reducing processing errors, controlling the system cost, and facilitating mass production.

[0138] In an exemplary embodiment, in the second lens system, there may be an air gap between any two adjacent lenses. Having a certain amount of air gap between adjacent lenses can ensure that the adjacent lenses do not contact each other within the machining tolerance of the lenses, thereby avoiding lens wear or cracking.

[0139] In an exemplary embodiment, the above-mentioned second lens system may further include at least one aperture stop. The aperture stop can be set at an appropriate position as needed, for example, between the first lens and the second lens. Optionally, the above-mentioned second lens system may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0140] The second lens system according to the above embodiment of the present application may employ multiple lenses, such as the six lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial spacing between each lens, etc., the volume of the second lens system can be effectively reduced, the sensitivity of the second lens system can be lowered, and the processability of the second lens system can be improved, making the second lens system more conducive to production and applicable to portable electronic imaging devices.

[0141] In an embodiment of the present application, at least one of the lens surfaces of each lens in the second lens system is an aspherical lens surface, that is, at least one of the object side and the image side of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspherical lens surface. Optionally, both the object side and the image side of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens in the second lens system are aspherical lens surfaces.

[0142] The following will refer to Figures 9 to 16D to further describe multiple embodiments of the second lens system according to the present application.

[0143] Example 5

[0144] The following refers to Figures 9 to 10D to describe the second lens system according to Embodiment 5 of the present application. Figure 9 FIG. shows a schematic structural diagram of the second lens system according to Embodiment 5 of the present application.

[0145] As Figure 9As shown, the second lens system sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0146] The first lens E1 has a negative focal power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a negative focal power, its object surface S3 is concave, and its image surface S4 is convex. The third lens E3 has a positive focal power, its object surface S5 is convex, and its image surface S6 is convex. The fourth lens E4 has a negative focal power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a positive focal power, its object surface S9 is concave, and its image surface S10 is convex. The sixth lens E6 has a negative focal power, its object surface S11 is convex, and its image surface S12 is concave. The filter E7 has an object surface S13 and an image surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15. In this embodiment, the first lens E1 to the sixth lens E6 can all be lenses made of plastic material.

[0147] Table 9 shows the basic parameter table of the second lens system of Embodiment 5, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 10 shows the high-order term coefficients of the aspherical mirror surfaces that can be used in Embodiment 5, where each aspherical surface type can be defined by the formula (1) given in the above Embodiment 1.

[0148]

[0149] Table 9

[0150] Among them, f W is the total effective focal length of the second lens system, TTL W is the distance on the optical axis of the second lens system from the object surface S1 of the first lens E1 of the second lens system to the imaging surface S15 of the second lens system, ImgH W is half of the diagonal length of the effective pixel region on the imaging surface S15 of the second lens system, and Semi-FOV W is the maximum half field of view angle of the second lens system.

[0151] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 5.4435E-01 -7.6902E-01 4.4887E+00 -2.3375E+01 8.5487E+01 -1.9711E+02 2.7343E+02 -2.0671E+02 6.4785E+01 S2 9.0867E-01 -3.1443E+00 4.5817E+01 -4.0839E+02 2.3283E+03 -8.1653E+03 1.6980E+04 -1.8837E+04 8.3864E+03 S3 -1.1352E-02 -8.4646E-01 2.6268E+00 -4.7747E+01 5.7529E+02 -3.5383E+03 1.1442E+04 -1.8250E+04 1.1301E+04 S4 2.0082E-01 -6.4434E+00 3.5422E+01 -1.6339E+02 6.2954E+02 -1.4978E+03 1.4806E+03 6.9119E+02 -1.7659E+03 S5 4.1001E-01 -5.9762E+00 3.1068E+01 -1.3937E+02 5.4351E+02 -1.4321E+03 2.2607E+03 -1.9341E+03 6.9136E+02 S6 2.4015E-01 -7.6926E-01 -6.5678E+00 4.6908E+01 -1.4427E+02 2.6767E+02 -3.0617E+02 1.9535E+02 -5.2494E+01 S7 3.6458E-02 -5.2828E-01 -3.7058E+00 2.0771E+01 -3.8891E+01 3.0573E+01 -3.0739E+00 -9.1068E+00 3.7496E+00 S8 -1.2516E-01 8.3790E-01 -5.2405E+00 1.6313E+01 -2.7884E+01 2.8407E+01 -1.7457E+01 6.0445E+00 -9.1860E-01 S9 4.1197E-02 -1.2020E-01 -1.2263E-01 1.8495E+00 -6.2113E+00 1.0459E+01 -9.3324E+00 4.2328E+00 -7.7343E-01 S10 -2.4302E-01 3.9499E-01 -1.1703E+00 2.8122E+00 -4.4827E+00 4.5693E+00 -2.8781E+00 1.0226E+00 -1.5541E-01 S11 -1.3085E-01 -1.0954E-01 5.5772E-02 2.4917E-01 -5.0760E-01 4.4187E-01 -2.0721E-01 5.1402E-02 -5.2889E-03 S12 -1.6712E-01 4.0358E-02 5.8398E-02 -8.6606E-02 5.6456E-02 -2.1456E-02 4.8842E-03 -6.2008E-04 3.3923E-05

[0152] Table 10

[0153] Figure 10A shows the axial chromatic aberration curve of the second lens system of Embodiment 5, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 10B shows the astigmatism curve of the second lens system of Embodiment 5, which represents the meridional image plane curvature and the sagittal image plane curvature.Figure 10C The distortion curve of the second lens system of Embodiment 5 is shown, which represents the distortion magnitude values corresponding to different field angles of view. Figure 10D The longitudinal chromatic aberration curve of the second lens system of Embodiment 5 is shown, which represents the deviation of different image heights on the imaging surface after light passes through the lens. According to Figures 10A to 10D it can be known that the second lens system given in Embodiment 5 can achieve good imaging quality.

[0154] Example 6

[0155] The following refers to Figures 11 to 12D and describes the second lens system according to Embodiment 6 of the present application. Figure 11 The structural schematic diagram of the second lens system according to Embodiment 6 of the present application is shown.

[0156] As Figure 11 shown, the second lens system sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0157] The first lens E1 has a negative optical power, its object surface S1 is convex, and its image surface S2 is concave. The second lens E2 has a positive optical power, its object surface S3 is convex, and its image surface S4 is convex. The third lens E3 has a negative optical power, its object surface S5 is concave, and its image surface S6 is convex. The fourth lens E4 has a negative optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a positive optical power, its object surface S9 is concave, and its image surface S10 is convex. The sixth lens E6 has a negative optical power, its object surface S11 is convex, and its image surface S12 is concave. The filter E7 has an object surface S13 and an image surface S14. Light from the object sequentially passes through each surface S1 to S14 and finally forms an image on the imaging surface S15. In this embodiment, the first lens E1 to the sixth lens E6 can all be lenses made of plastic material.

[0158] Table 11 shows the basic parameter table of the second lens system of Embodiment 6, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 12 shows the higher-order term coefficients that can be used for each aspherical mirror surface in Embodiment 6, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0159]

[0160]

[0161] Table 11

[0162] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.5692E-01 -2.2390E-01 -3.3064E-01 6.4406E+00 -3.0008E+01 7.8737E+01 -1.2130E+02 1.0389E+02 -3.9358E+01 S2 8.1730E-01 -2.4023E+00 4.9767E+01 -5.6709E+02 4.1736E+03 -1.8946E+04 5.1758E+04 -7.7072E+04 4.8064E+04 S3 -2.0830E-02 -1.1740E+00 2.3890E+01 -3.4175E+02 2.9962E+03 -1.6516E+04 5.5220E+04 -1.0205E+05 8.0309E+04 S4 9.6683E-02 -1.0748E+00 1.4183E+00 -2.8737E+01 3.1653E+02 -1.5396E+03 3.8832E+03 -5.0602E+03 2.7463E+03 S5 2.6893E-01 -1.0409E+00 -7.6131E+00 5.3704E+01 -1.1480E+02 -3.7305E+01 5.3751E+02 -7.8690E+02 3.6777E+02 S6 -9.5685E-02 2.7388E+00 -2.3848E+01 1.0199E+02 -2.4975E+02 3.6044E+02 -2.9824E+02 1.2674E+02 -1.9850E+01 S7 -1.0405E-01 -2.4986E-02 -3.8517E+00 2.2389E+01 -5.7310E+01 8.1943E+01 -6.8770E+01 3.2326E+01 -6.8616E+00 S8 -1.2869E-01 4.2753E-01 -2.1849E+00 7.5182E+00 -1.4812E+01 1.7539E+01 -1.2421E+01 4.8513E+00 -8.0562E-01 S9 5.0143E-02 -2.3685E-01 8.9591E-01 -2.5538E+00 5.0760E+00 -6.6336E+00 5.4303E+00 -2.4769E+00 4.7351E-01 S10 -2.5933E-01 2.6130E-01 -2.7831E-01 2.4627E-01 -1.9167E-01 1.3230E-01 -5.8436E-02 6.5903E-03 3.5647E-03 S11 -1.8737E-01 1.1285E-01 -2.5708E-01 4.6634E-01 -5.4579E-01 3.9930E-01 -1.7738E-01 4.3594E-02 -4.5007E-03 S12 -1.4827E-01 6.6642E-02 -1.0587E-02 -1.6257E-02 1.5505E-02 -6.8324E-03 1.6938E-03 -2.2751E-04 1.2964E-05

[0163] Table 12

[0164] Figure 12A shows the axial chromatic aberration curve of the second lens system of Embodiment 6, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 12B shows the astigmatism curve of the second lens system of Embodiment 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 12C shows the distortion curve of the second lens system of Embodiment 6, which represents the distortion magnitude values corresponding to different field angles. Figure 12D shows the longitudinal chromatic aberration curve of the second lens system of Embodiment 6, which represents the deviation of different image heights on the imaging plane after light rays pass through the lens. According to Figures 12A to 12D it can be seen that the second lens system given in Embodiment 6 can achieve good imaging quality.

[0165] Example 7

[0166] The following refers to Figures 13 to 14D describes the second lens system according to Embodiment 7 of the present application. Figure 13 shows a schematic structural diagram of the second lens system according to Embodiment 7 of the present application.

[0167] As Figure 13 shown, the second lens system sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0168] The first lens E1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a positive optical power, its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has a positive optical power, its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has a positive optical power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has a negative optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15. In this embodiment, the first lens E1 to the sixth lens E6 can all be lenses made of plastic material.

[0169] Table 13 shows the basic parameter table of the second lens system of Example 7, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 14 shows the high-order term coefficients available for each aspherical mirror surface in Example 7, where each aspherical surface type can be defined by the formula (1) given in the above Example 1.

[0170]

[0171] Table 13

[0172] Surface number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.9316E-01 -1.6422E-01 -4.0117E-01 4.6728E+00 -1.9018E+01 4.5626E+01 -6.5058E+01 5.1291E+01 -1.7305E+01 S2 7.5331E-01 -9.7313E-01 1.9083E+01 -1.3345E+02 2.8826E+02 2.7927E+03 -2.1522E+04 5.8897E+04 -5.8569E+04 S3 4.4726E-02 -2.4021E+00 5.3078E+01 -7.3798E+02 6.3042E+03 -3.3782E+04 1.0998E+05 -1.9792E+05 1.5080E+05 S4 -1.3088E-01 8.2034E-01 -7.7285E+00 1.3778E+01 4.8195E+00 -3.0387E+00 -1.5915E+02 3.4196E+02 -1.8455E+02 S5 2.4381E-02 1.8509E+00 -1.4386E+01 4.9013E+01 -1.5844E+02 4.7065E+02 -8.9711E+02 9.1044E+02 -3.7525E+02 S6 -1.2611E+00 1.0771E+01 -5.5623E+01 2.0727E+02 -5.7368E+02 1.1118E+03 -1.3755E+03 9.5414E+02 -2.7935E+02 S7 -4.1333E-02 -2.3427E+00 1.1972E+01 -3.4424E+01 5.9614E+01 -5.4628E+01 1.3403E+01 1.5443E+01 -9.6092E+00 S8 3.2079E-01 -3.2708E+00 1.2669E+01 -2.9817E+01 4.6455E+01 -4.7598E+01 3.0692E+01 -1.1286E+01 1.8039E+00 S9 -7.4686E-02 9.7234E-01 -4.5594E+00 1.1238E+01 -1.6044E+01 1.3717E+01 -6.6800E+00 1.5736E+00 -1.0405E-01 S10 -3.4933E-01 6.8566E-01 -1.6470E+00 3.0550E+00 -4.0165E+00 3.5008E+00 -1.8439E+00 5.1081E-01 -5.1912E-02 S11 -1.6067E-01 5.5390E-02 -3.9379E-01 9.4453E-01 -1.2447E+00 1.0036E+00 -4.8874E-01 1.3080E-01 -1.4628E-02 S12 -5.4392E-02 -1.1681E-01 1.9594E-01 -1.7160E-01 9.5232E-02 -3.4078E-02 7.5816E-03 -9.5307E-04 5.1774E-05

[0173] Table 14

[0174] Figure 14A shows the axial chromatic aberration curve of the second lens system of Example 7, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 14B shows the astigmatism curve of the second lens system of Example 7, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 14C shows the distortion curve of the second lens system of Example 7, which represents the distortion magnitude values corresponding to different field angles. Figure 14D shows the lateral chromatic aberration curve of the second lens system of Example 7, which represents the deviation of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 14A to 14D it can be known that the second lens system given in Example 7 can achieve good imaging quality.

[0175] Example 8

[0176] The following refers to Figures 15 to 16D to describe the second lens system according to Embodiment 8 of the present application. Figure 15 shows a schematic structural diagram of the second lens system according to Embodiment 8 of the present application.

[0177] As Figure 15 shown, the second lens system sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a diaphragm STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15.

[0178] The first lens E1 has a negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens E2 has a positive optical power, its object side S3 is convex, and its image side S4 is convex. The third lens E3 has a positive optical power, its object side S5 is concave, and its image side S6 is convex. The fourth lens E4 has a negative optical power, its object side S7 is convex, and its image side S8 is concave. The fifth lens E5 has a positive optical power, its object side S9 is concave, and its image side S10 is convex. The sixth lens E6 has a positive optical power, its object side S11 is convex, and its image side S12 is concave. The filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15. In this embodiment, the first lens E1 to the sixth lens E6 can all be lenses made of plastic material.

[0179] Table 15 shows the basic parameter table of the second lens system of Embodiment 8, where the units of the radius of curvature, thickness, and focal length are all millimeters (mm). Table 16 shows the high-order term coefficients of the aspherical mirrors that can be used in Embodiment 8, where each aspherical surface type can be defined by the formula (1) given in Embodiment 1 above.

[0180]

[0181] Table 15

[0182]

[0183]

[0184] Table 16

[0185] Figure 16A shows the axial chromatic aberration curve of the second lens system of Embodiment 8, which represents the deviation of the converging points of light rays of different wavelengths after passing through the lens. Figure 16B shows the astigmatism curve of the second lens system of Embodiment 8, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16C shows the distortion curve of the second lens system of Embodiment 8, which represents the distortion magnitude values corresponding to different field angles. Figure 16D shows the lateral chromatic aberration curve of the second lens system of Embodiment 8, which represents the deviation of different image heights of light rays on the imaging surface after passing through the lens. According to Figures 16A to 16D it can be seen that the second lens system given in Embodiment 8 can achieve good imaging quality.

[0186] In summary, Embodiments 1 to 8 respectively satisfy the relationships shown in Table 17.

[0187] Conditional / Example 1 2 3 4 5 6 7 8 <![CDATA[Semi-FOV T (°)]]> 20.8 21.3 21.0 20.8 <![CDATA[Semi-FOV W (°)]]> 52.3 52.1 52.0 52.0 <![CDATA[TTL T / f T > 0.83 0.85 0.84 0.83 <![CDATA[(f2 T +f5 T ) / f4 T > 0.63 0.46 0.50 0.65 <![CDATA[ImgH T / f T > 0.39 0.40 0.39 0.39 <![CDATA[R11 T / R12 T > 1.03 1.17 1.22 0.93 <![CDATA[f1234 T / (R1 T +R2 T )]]> 0.41 0.44 0.43 0.42 <![CDATA[f W / f5 W > 1.49 1.56 1.79 0.40 <![CDATA[R2 W / R1 W > 0.43 0.50 0.39 0.46 <![CDATA[R8 W / R7 W > 0.51 0.59 0.96 0.40 <![CDATA[TTL W / ImgH W > 1.87 1.86 1.87 1.88 <![CDATA[f W / EPD W > 2.19 2.19 2.19 2.19

[0188] Table 17

[0189] Although the first lens system and the second lens system are both described by taking six lenses as an example in the above text, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the first lens system and / or the second lens system can be changed. If necessary, the first lens system and the second lens system can also include other numbers of lenses. At the same time, without departing from the spirit and scope of this application, the various embodiments of the first lens system and the second lens system mentioned above can be arbitrarily combined to obtain the various results and advantages described in this specification.

[0190] Similarly, although the electronic imaging device disclosed in this application includes two imaging devices, it should be understood that the number of imaging devices carried by the electronic imaging device is only an example and should not limit this application. If necessary, the electronic imaging device can also include other numbers of imaging devices.

[0191] The above description is only the preferred embodiments of this application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by arbitrarily combining the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An electronic imaging device, characterized in that, comprising: A first imaging device, including a first lens system and a first electronic photosensitive element located on the imaging surface of the first lens system. The first lens system includes at least one lens with optical power, and the lens closest to the object side among the lenses with optical power in the first lens system has a positive optical power; and A second imaging device, including a second lens system and a second electronic photosensitive element located on the imaging surface of the second lens system. The second lens system includes at least one lens with optical power, and the lens closest to the object side among the lenses with optical power in the second lens system has a negative optical power; wherein, the first imaging device and the second imaging device are located on the same side of the electronic imaging device, and the first imaging device and the second imaging device have different field angles of view; wherein, the first lens system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the optical axis of the first lens system from the object side to the imaging surface of the first lens system, and the number of lenses with optical power in the first lens system is six; The first lens of the first lens system has a positive optical power, its object side surface is convex, and its image side surface is concave; The second lens of the first lens system has a negative optical power, its object side surface is convex, and its image side surface is concave; The object side surface of the third lens of the first lens system is convex, and its image side surface is concave; The fourth lens of the first lens system has a negative optical power, its object side surface is convex, and its image side surface is concave; The fifth lens of the first lens system has a negative optical power, its object side surface is concave, and its image side surface is concave; The object side surface of the sixth lens of the first lens system is concave, and its image side surface is convex; wherein, the second lens system sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the optical axis of the second lens system from the object side to the imaging surface of the second lens system, and the number of lenses with optical power in the second lens system is six; The first lens of the second lens system has a negative optical power, its object side surface is convex, and its image side surface is concave; The image side surface of the second lens of the second lens system is convex; The image side surface of the third lens of the second lens system is convex; The object side surface of the fourth lens of the second lens system is convex, and its image side surface is concave; The fifth lens of the second lens system has a positive optical power, its object side surface is concave, and its image side surface is convex; The object side surface of the sixth lens of the second lens system is convex, and its image side surface is concave; The total effective focal length f of the first lens system T and the total effective focal length f of the second lens system W satisfy 3.39 ≤ f T / f W ≤ 6.90 / 1.95; The distance TTL on the optical axis of the imaging surface of the first lens system from the object surface of the lens closest to the object side of the first lens system T and the total effective focal length f of the first lens system T satisfy 0.8 < TTL T / f T < 0.

9.

2. The electronic imaging device according to claim 1, characterized in that, The maximum semi-field of view Semi-FOV of the first lens system T satisfies 20.8° ≤ Semi-FOV T ≤ 21.3°.

3. The electronic imaging device according to claim 1, characterized in that, The maximum semi-field of view Semi-FOV of the second lens system W satisfies 52.0° ≤ Semi-FOV W ≤ 52.3°.

4. The electronic imaging device according to claim 1, characterized in that, Half of the diagonal length of the effective pixel area on the imaging surface of the first lens system, ImgH T and the total effective focal length f of the first lens system T satisfy 0.39 ≤ ImgH T / f T ≤ 0.

40.

5. The electronic imaging device according to claim 1, characterized in that, The distance TTL on the optical axis of the imaging surface of the second lens system from the object surface of the lens closest to the object side of the second lens system W and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the second lens system W satisfy 1.86 ≤ TTL W / ImgH W <1.9 6. The electronic imaging device according to claim 1, characterized in that, The total effective focal length f of the second lens system W and the entrance pupil diameter EPD of the second lens system W satisfy 2.19 ≤ f W / EPD W <2.2 7. The electronic imaging device according to claim 1, characterized in that, In the first lens system, there is an air gap between any two adjacent lenses; and In the second lens system, there is an air gap between any two adjacent lenses.

8. The electronic imaging device according to claim 1, wherein, The effective focal length f2 of the second lens of the first lens system T and the effective focal length f5 of the fifth lens of the first lens system T and the effective focal length f4 of the fourth lens of the first lens system T satisfy 0.46 ≤ (f2 T + f5 T ) / f4 T <0.

7.

9. The electronic imaging device according to claim 1, wherein, The radius of curvature R11 of the object side surface of the sixth lens of the first lens system T and the radius of curvature R12 of the image side surface of the sixth lens of the first lens system T satisfy 0.93 ≤ R11 T / R12 T ≤ 1.

22.

10. The electronic imaging device according to claim 1, wherein, The combined focal length f1234 of the first, second, third, and fourth lenses of the first lens system T , the radius of curvature R1 of the object side surface of the first lens of the first lens system T and the radius of curvature R2 of the image side surface of the first lens of the first lens system T satisfy 0.41 ≤ f1234 T / (R1 T + R2 T ) ≤ 0.

44.

11. The electronic imaging device according to claim 1, wherein, At least four lenses among the first lens to the sixth lens of the first lens system are lenses made of plastic material.

12. The electronic imaging device according to claim 1, wherein, The total effective focal length f of the second lens system W and the effective focal length f5 of the fifth lens of the second lens system W satisfy 0.4 ≤ f W / f5 W ≤ 1.

8.

13. The electronic imaging device according to claim 1, wherein, The radius of curvature R2 of the image side surface of the first lens of the second lens system W and the radius of curvature R1 of the object side surface of the first lens of the second lens system W satisfy 0.39 ≤ R2 W / R1 W ≤ 0.

50.

14. The electronic imaging device according to claim 1, wherein, The radius of curvature R8 of the image side surface of the fourth lens of the second lens system W and the radius of curvature R7 of the object side surface of the fourth lens in the second lens system W satisfy 0.40 ≤ R8 W / R7 W <1.0 15. The electronic imaging device according to claim 1, wherein, At least four lenses among the first lens to the sixth lens of the second lens system are lenses made of plastic material.

16. The electronic imaging device according to claim 1, wherein, The first imaging device and the second imaging device are arranged longitudinally or transversely on one side of the electronic imaging device.

Images