Light and thin long-focus camera

Abstract

The utility model discloses a light and thin long-focus camera, and belongs to the technical field of cameras. The light and thin long-focus camera comprises a first lens, a second lens, a third lens and a fourth lens, the object side surfaces and the image side surfaces of the first lens, the second lens, the third lens and the fourth lens are aspheric surfaces, and the light and thin long-focus camera further comprises a diaphragm arranged in front of the first lens; according to the utility model, through the design of the first lens, the second lens, the third lens, the fourth lens and the diaphragm, under the combination of the surface shape structure of each lens and the optimal range of optical parameters, the camera has the characteristic of long focal length, has better imaging quality, can realize high-definition long-shot shooting, and has a wide application prospect. Therefore, the periphery of the shot image is not easy to distort and deform, and the shot image can be closer to the shot object, so that the imaging quality of the photo is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cameras, and in particular to a lightweight and thin telephoto camera. Background Art

[0002] With the continuous development of science and technology, people's requirements for the camera function of mobile phones are constantly increasing. With the continuous improvement of various technologies, people's requirements for mobile phone shooting are also increasing to meet people's shooting needs.

[0003] During the shooting process, current mobile phone cameras are not thin enough, which makes the overall phone not slim enough, thus affecting the portability and aesthetics of the phone and failing to meet consumers' needs for mobile phone use. In addition, the long-range shooting of current mobile phone cameras is not clear enough, which makes the surrounding of the captured image easily distorted, thus affecting the image quality, resolution and clarity of the captured image, resulting in the captured image not being close to the object itself, thus affecting the imaging quality of the photo. Utility Model Content

[0004] The purpose of this utility model is to solve the problem that the current camera is not thin and light enough, which affects the portability and aesthetics of the mobile phone, and the camera's long-range shooting is not clear enough, which affects the quality of photo imaging, and to propose a thin and light telephoto camera.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A lightweight telephoto camera includes a first lens, a second lens, a third lens, and a fourth lens, wherein the object side surfaces and image side surfaces of the first lens, the second lens, the third lens, and the fourth lens are all aspherical surfaces, and further includes an aperture arranged in front of the first lens, wherein the first lens has positive refractive power, the second lens, the third lens, and the fourth lens all have negative refractive power, the object side surface of the first lens is convex at the paraxial direction, the object side surfaces of the second lens and the fourth lens are both concave at the paraxial direction, and the image side surfaces of the third lens and the fourth lens are both concave at the paraxial direction, 0.259<f / R4<0.377, 79.082<V2+V4<79.092.

[0007] In order to select the focal length range of the high-definition optical imaging lens and the distance from the first lens to the imaging surface on the optical axis, preferably, 0.979 <f / TL<0.981。

[0008] In order to select the sag range of the image side surface of the third lens at the maximum effective radius and the axial air gap range between the third lens and the fourth lens, preferably, 0.156 <SAG34 / T34<0.157。

[0009] In order to select the total optical length range of the camera optical lens and the focal length range of the high-definition optical imaging lens, preferably, 1.019 <TTL / f<1.021。

[0010] In order to select the range of the on-axis air gap between the third lens and the fourth lens and the sum of the air gaps between the first lens and the aperture, preferably, 0.463 <T34 / AAT<0.468。

[0011] In order to select the focal length range of the high-definition optical imaging lens and the focal length range of the first lens plus the focal length range of the fourth lens, preferably, -0.257 <f / (f1+f4)<-0.240。

[0012] In order to select the focal length range of the high-definition optical imaging lens and the combined focal length range of the first lens, the second lens and the third lens, preferably, -0.211 <f / f123<-0.205。

[0013] In order to select the focal length range of the fourth lens and the thickness of the fourth lens on the optical axis, preferably, -15.065 <f4 / CT4<14.303。

[0014] Compared with the existing technology, the present invention provides a lightweight and thin telephoto camera with the following beneficial effects:

[0015] 1. This thin and light telephoto camera, through the design of the first lens, second lens, third lens, fourth lens, and aperture, and by combining the surface structure of each lens with the optimized range of optical parameters, has the characteristics of a long focal length and good imaging quality, enabling high-definition long-range shooting, making the periphery of the captured image less susceptible to distortion, thereby improving the clarity, resolution, and image quality of the captured image, making the captured image closer to the photographed object itself, thereby greatly improving the imaging quality of the photo. In addition, the four-lens design can reduce the overall thickness of the camera, improve its lightness and thinness, and thus make the entire mobile phone more slim, which is conducive to improving the portability and aesthetics of the mobile phone, thereby meeting the user needs of consumers for mobile phones.

[0016] The parts not involved in this device are the same as the existing technology or can be implemented by using the existing technology. The utility model solves the problem that the current camera is not light and thin enough, which affects the portability and aesthetics of the mobile phone, and the camera's long-range shooting is not clear enough, which affects the image quality of the photo. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a planar exploded view of a lightweight telephoto camera proposed in the present invention;

[0018] Figure 2 This is a distortion correction method for a lightweight telephoto camera proposed in this utility model. Figure 1 ;

[0019] Figure 3 This is the axial chromatic aberration curve of a lightweight telephoto camera proposed in this utility model Figure 1 ;

[0020] Figure 4 This is a distortion correction method for a lightweight telephoto camera proposed in this utility model. Figure 2 ;

[0021] Figure 5 This is the axial chromatic aberration curve of a lightweight telephoto camera proposed in this utility model Figure 2 ;

[0022] Figure 6 This is a distortion correction method for a lightweight telephoto camera proposed in this utility model. Figure 3 ;

[0023] Figure 7 This is the axial chromatic aberration curve of a lightweight telephoto camera proposed in this utility model Figure 3 ;

[0024] Figure 8 This is a distortion correction method for a lightweight telephoto camera proposed in this utility model. Figure 4 .

[0025] Figure 9 This is the axial chromatic aberration curve of a lightweight telephoto camera proposed in this utility model Figure 4

[0026] In the figure: 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, aperture. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] Example 1:

[0030] Reference Figure 1 , an embodiment of the utility model provides a lightweight telephoto camera, including a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4, the object side surfaces and image side surfaces of the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are all aspherical surfaces, and also includes an aperture 5 arranged in front of the first lens 1, for controlling the amount of light passing through the lens, wherein the first lens 1 has positive refractive power, and the second lens 2, the third lens 3 and the fourth lens 4 all have negative refractive power, the positive and negative refractive powers will cause the incident light to diffuse outward, expand the field of view, reduce distortion, and thus optimize the optical performance of the entire system, the object side surface of the first lens 1 is convex at the paraxial point, the object side surfaces of the second lens 2 and the fourth lens 4 are both concave at the paraxial point, and the image side surfaces of the third lens 3 and the fourth lens 4 are both concave at the paraxial point, 0.259<f / R4<0.377, 79.082<V2+V4<79.092.

[0031] Specifically, when in use, through the design of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the aperture 5, and the combination of the surface structure of each lens and the optimization range of the optical parameters, the camera has the characteristics of a long focal length and good imaging quality, can achieve high-definition long-range shooting, and makes it less likely that the surroundings of the captured image will be distorted, thereby improving the clarity, resolution and image quality of the captured image, so that the captured image can be closer to the captured object itself, thereby greatly improving the imaging quality of the photo, and through the four-lens design, the overall thickness of the camera can be reduced, and its lightness and thinness can be improved, thereby making the entire mobile phone more slim, which is conducive to improving the portability and aesthetics of the mobile phone, so as to meet consumers' needs for mobile phone use.

[0032] The above 0.979 <f / TL<0.981。

[0033] Specifically, through the numerical range, the focal length range of the high-definition optical imaging lens can be selected, and the distance from the first lens 1 to the imaging surface on the optical axis can also be selected.

[0034] The above 0.156 <SAG34 / T34<0.157。

[0035] Specifically, through the numerical interval, the sagittal height range of the image side surface of the third lens 3 at the maximum effective radius can be selected, and the on-axis air gap range between the third lens 3 and the fourth lens 4 can also be selected.

[0036] 1.019 above <TTL / f<1.021。

[0037] Specifically, through the numerical range, the total optical length range of the camera optical lens can be selected, and the focal length range of the high-definition optical imaging lens can also be selected.

[0038] The above 0.463 <T34 / AAT<0.468。

[0039] Specifically, through the numerical interval, the range of the on-axis air gap between the third lens 3 and the fourth lens 4 can be selected, and the range of the sum of the air gaps between adjacent lenses from the first lens 1 to the aperture 5 can also be selected.

[0040] Above -0.257 <f / (f1+f4)<-0.240。

[0041] Specifically, through the numerical range, the focal length range of the high-definition optical imaging lens can be selected, and the focal length range of the first lens 1 plus the focal length of the fourth lens 4 can also be selected.

[0042] Above -0.211 <f / f123<-0.205。

[0043] Specifically, through the numerical range, the focal length range of the high-definition optical imaging lens can be selected, and the combined focal length range of the first lens 1, the second lens 2 and the third lens 3 can also be selected.

[0044] Above -15.065 <f4 / CT4<14.303。

[0045] Specifically, the focal length range of the fourth lens 4 can be selected through the numerical interval, and the thickness of the fourth lens 4 on the optical axis can also be selected.

[0046] The meanings of “alphanumeric values” in this utility model are as follows:

[0047] f: focal length of the high-definition optical imaging lens;

[0048] R4: the radius of curvature of the object side of the fourth lens;

[0049] V2: Abbe number of the second lens 2;

[0050] V4: The fourth lens has an Abbe number of 4 (the higher the Abbe number, the less chromatic aberration and the better the image quality);

[0051] D23: The distance on the optical axis from the image side of the second lens 2 to the object side of the third lens 3;

[0052] CT4: thickness of the fourth lens 4 on the optical axis;

[0053] TL: distance from the first lens 1 to the imaging plane on the optical axis;

[0054] SAG34: sag of the image side surface of the third lens 3 at the maximum effective radius;

[0055] T34: an axial air space between the third lens 3 and the fourth lens 4;

[0056] TTL: total optical length of the camera optical lens;

[0057] T23: The air gap on the optical axis between the image side of the second lens element 2 and the object side of the third lens element 3;

[0058] AAT: The sum of the air gaps between the first lens 1 and the aperture 5;

[0059] f1: focal length of the first lens 1;

[0060] f4: focal length of the fourth lens 4;

[0061] f123: the combined focal length of the first lens 1, the second lens 2, and the third lens 3;

[0062] f3: focal length of the third lens 3.

[0063] Example 2:

[0064] Based on Example 1, the specific parameters selected are f=9.40mm, Fno=2.51, FOV=35.94° and aspheric coefficient to obtain the following table:

[0065]

[0066]

[0067] Specifically, through the data in the above table, it is possible to generate Figure 2 and Figure 3 .

[0068] Example 3:

[0069] Based on Example 1, the specific parameters selected are f=9.35mm, Fno=2.52, FOV=35.99° and aspheric coefficient to obtain the following table:

[0070]

[0071]

[0072]

[0073] Specifically, through the data in the above table, it is possible to generate Figure 4 and Figure 5 .

[0074] Example 4:

[0075] Based on Example 1, the specific parameters selected are f=10.20mm, Fno=2.50, FOV=36.13° and aspheric coefficient to obtain the following table:

[0076]

[0077]

[0078]

[0079] Specifically, through the data in the above table, it is possible to generate Figure 6 and Figure 7 .

[0080] Embodiment 5:

[0081] Based on Example 1, the specific parameters selected are f=9.34mm, Fno=2.52, FOV=35.86° and aspheric coefficient to obtain the following table:

[0082]

[0083]

[0084] Specifically, through the data in the above table, it is possible to generate Figure 8 and Figure 9 .

[0085] In the above table: f represents focal length, Fno represents aperture number, and FOV represents field of view. These three parameters work together in the design of high-pixel telephoto cameras to ensure that users can obtain high-quality images.

[0086] This utility model is Figure 2 、 Figure 4 、 Figure 6 as well as Figure 8 The comparison of the changes in the distortion curves shows that the object is deformed after being imaged by the lens. The closer the distortion curve is to 0, the closer the image shape is to the shape of the object.

[0087] And, through Figure 3 、 Figure 5 、 Figure 7 as well as Figure 9 Comparing the changes in the central axial chromatic aberration curves shows that each curve represents the focal position of light of different wavelengths after passing through the lens. The closer the different curves are, the better the chromatic aberration effect of the lens.

[0088] This high-pixel telephoto camera has the characteristics of a long focal length and good imaging quality through the design of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the aperture 5, and the combination of the surface structure of each lens and the optimization range of the optical parameters. It can achieve high-definition long-range shooting, and makes it less likely that the surroundings of the captured image will be distorted, thereby improving the clarity, resolution and image quality of the captured image, making the captured image closer to the captured object itself, thereby greatly improving the imaging quality of the photo. In addition, the four-lens design can reduce the overall thickness of the camera, improve its lightness and thinness, and make the mobile phone as a whole more slim, which is conducive to improving the portability and aesthetics of the mobile phone to meet consumers' needs for mobile phone use.

[0089] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lightweight telephoto camera, comprising a first lens (1), a second lens (2), a third lens (3) and a fourth lens (4), characterized in that: The object side and image side of the first lens (1), the second lens (2), the third lens (3) and the fourth lens (4) are all aspherical surfaces, and further include a stop (5) arranged in front of the first lens (1). The first lens (1) has positive refractive power, the second lens (2), the third lens (3) and the fourth lens (4) all have negative refractive power, the object side surface of the first lens (1) is convex at the near axis, the object side surfaces of the second lens (2) and the fourth lens (4) are concave at the near axis, the image side surfaces of the third lens (3) and the fourth lens (4) are concave at the near axis, 0.259<f / R4<0.377, 79.082<V2+V4<79.

092.

2. The lightweight telephoto camera according to claim 1, characterized in that: 0.979 <f / TL<0.981。 3. The lightweight telephoto camera according to claim 1, characterized in that: 0.156 <SAG34 / T34<0.157。 4. The lightweight telephoto camera according to claim 1, wherein: 1.019 <TTL / f<1.021。 5. The lightweight telephoto camera according to claim 1, characterized in that: 0.463 <T34 / AAT<0.468。 6. The lightweight telephoto camera according to claim 1, characterized in that: -0.257 <f / (f1+f4)<-0.240。 7. The lightweight telephoto camera according to claim 1, characterized in that: -0.211 <f / f123<-0.205。 8. The lightweight telephoto camera according to claim 1, characterized in that: -15.065 <f4 / CT4<14.303。

Images