An optical lens and a photographing device

Abstract

The present invention discloses an optical lens and a photographing device. The optical lens has an object side and an image side oppositely arranged along its optical axis direction. The optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side to the image side. Among them, the first lens, the second lens, the fifth lens, and the seventh lens have negative optical powers; the third lens, the fourth lens, and the sixth lens have positive optical powers; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are fixedly arranged relative to the imaging surface. Among them, the aperture value of the optical lens is F, and 1.8 ≤ F ≤ 2.8. The present invention aims to provide an optical lens with low cost and small distortion.

Description

Technical Field

[0001] The present invention relates to the technical field of optical system design, and particularly relates to an optical lens and a photographing device. Background Art

[0002] In recent years, with the rapid development of the remote conferencing, remote course, and webcasting industries, the demand for video cameras has been increasing.

[0003] Video lenses are an essential part of camera monitoring and conferencing systems, and the requirements for video lenses are also getting higher and higher, mainly reflected in aspects such as the field of view angle, small distortion, clarity, cost, volume, etc.

[0004] Current video lenses often have a small field of view angle, large distortion, high cost, and large volume. Summary of the Invention

[0005] The main object of the present invention is to propose an optical lens and a photographing device, aiming to provide an optical lens with low cost and small distortion.

[0006] To achieve the above object, the present invention proposes an optical lens. The optical lens has an object side and an image side oppositely arranged along its optical axis direction. The optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side to the image side;

[0007] Wherein, the first lens, the second lens, the fifth lens, and the seventh lens have negative optical powers;

[0008] The third lens, the fourth lens, and the sixth lens have positive optical powers;

[0009] The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are fixedly arranged relative to the imaging surface;

[0010] Wherein, the aperture value of the optical lens is F, and 1.8 ≤ F ≤ 2.8.

[0011] Optionally, the focal length of the optical lens is f, wherein:

[0012] In the first lens: the focal length of the first lens is f 1 , the dispersion coefficient of the first lens is Vd 1 , 1.3 < |f1 / f| < 2.6 and / or 40 < Vd 1 <70; and / or,

[0013] In the second lens: the focal length of the second lens is f 2 , 8 < |f2 / f | < 17; and / or,

[0014] In the third lens: the focal length of the third lens is f 3 , 2.2 < |f 3 / f | < 4.3; and / or,

[0015] In the fourth lens: the focal length of the fourth lens is f 4 , 0.9 < |f 4 / f | < 1.7; and / or,

[0016] In the fifth lens: the focal length of the fifth lens is f 5 , 1.2 < |f 5 / f | < 2.3; and / or,

[0017] In the sixth lens: the focal length of the sixth lens is f 6 , 1.1 < |f 6 / f | < 2.1; and / or,

[0018] In the seventh lens: the focal length of the seventh lens is f 7 , the dispersion coefficient of the seventh lens is Vd 7 , 1.3 < |f 7 / f | < 2.5 and / or 20 ps / nm.km < Vd 7 < 40 ps / nm.km; and / or,

[0019] The combined focal length of the fourth lens and the fifth lens is f 45 , 1.9 < |f 45 / f | < 3.9.

[0020] Optionally, the overall optical length of the optical lens is TTL, 8 mm < TTL < 18 mm.

[0021] Optionally, the focal length of the optical lens is f, the overall optical length of the optical lens is TTL, 5 < TTL / f < 10.

[0022] Optionally, the object side of the first lens is set to a convex surface, and the image side of the first lens is set to a concave surface; and / or,

[0023] The object side and the image side of the second lens are both concave surfaces; and / or,

[0024] The object side and the image side of the third lens are both convex surfaces; and / or,

[0025] The object side and the image side of the fourth lens are both convex surfaces; and / or,

[0026] The object side and the image side of the fifth lens are both concave; and / or,

[0027] The object side and the image side of the sixth lens are both concave; and / or,

[0028] The object side and the image side of the seventh lens are both concave.

[0029] Optionally, the materials of the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all plastic materials, and the material of the third lens is a glass material.

[0030] Optionally, the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical lenses, and the third lens is a spherical lens.

[0031] Optionally, the diameter of the first lens is greater than the diameter of the second lens; and / or,

[0032] The diameter of the second lens is greater than the diameter of the third lens; and / or,

[0033] The diameter of the third lens is greater than the diameter of the fourth lens; and / or,

[0034] The diameter of the fourth lens is less than the diameter of the fifth lens; and / or,

[0035] The diameter of the fifth lens is less than the diameter of the sixth lens; and / or,

[0036] The diameter of the sixth lens is less than the diameter of the seventh lens.

[0037] Optionally, the optical lens further includes a diaphragm disposed between the third lens and the fourth lens.

[0038] The present invention also provides a photographing device, the photographing device includes an optical lens, the optical lens has an object side and an image side oppositely disposed along its optical axis direction, the optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side to the image side; wherein, the first lens, the second lens, the fifth lens, and the seventh lens have negative optical powers; the third lens, the fourth lens, and the sixth lens have positive optical powers; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are fixedly arranged relative to the imaging surface; wherein, the aperture value of the optical lens is F, and 1.8 ≤ F ≤ 2.8.

[0039] In the technical solution of the present invention, by providing a first lens with a negative focal power, it plays a role in collecting light for a large field-of-view optical system and corrects axial chromatic aberration at the same time. By providing a second lens, it is used to reduce the volume of the lens and correct off-axis aberration. By providing a third lens, it can correct the chromatic aberration and spherical aberration of the system. By providing a fourth lens, it can correct the chromatic aberration and field curvature of the system and increase the aperture of the system. By providing a fifth lens, it can correct chromatic aberration. By providing a sixth lens and a seventh lens, it can correct the chromatic aberration, spherical aberration and field curvature of the system, and ensure the imaging performance of the optical system at high and low temperatures, realizing a low-cost, small-distortion high-definition ultra-wide-angle video lens with an aperture value between 1.8 and 2.8. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0041] Figure 1 It is a schematic structural diagram of an embodiment of the optical lens provided by the present invention;

[0042] Figure 2 is Figure 1 a schematic diagram of distortion / field curvature of the optical lens in

[0043] Figure 3 is Figure 1 a schematic diagram of the spherical aberration curve of the optical lens in

[0044] Figure 4 is Figure 1 a schematic diagram of the light fan of the optical lens in

[0045] Description of the reference numerals in the drawings:

[0046] Reference numeral Name Reference numeral Name 100 Optical lens 4 Fourth lens 1 First lens 5 Fifth lens 2 Second lens 6 Sixth lens 3 Third lens 7 Seventh lens

[0047] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0049] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0050] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] In recent years, with the rapid development of the remote meeting, remote course, and webcast industries, the demand for video cameras has been increasing.

[0052] The video lens is an essential part of the camera monitoring and conference system, and the requirements for the video lens are also getting higher and higher, mainly reflected in aspects such as the field of view angle, small distortion, clarity, cost, volume, etc.

[0053] Currently, the existing video lenses often have a small field of view angle, large distortion, high cost, and large volume.

[0054] In view of this, the present invention proposes an optical lens. Figures 1 to 4 This is an embodiment of the present invention.

[0055] Please refer to Figure 1, the optical lens 100 has an object side and an image side oppositely arranged along its optical axis direction, and the optical lens 100 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7 arranged in sequence from the object side to the image side; wherein, the first lens 1, the second lens 2, the fifth lens 5, and the seventh lens 7 have negative optical powers; the third lens 3, the fourth lens 4, and the sixth lens 6 have positive optical powers; the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are fixedly arranged relative to the imaging surface; wherein, the aperture value of the optical lens 100 is F, and 1.8 ≤ F ≤ 2.8.

[0056] In the technical solution of the present invention, by providing the first lens 1 with negative optical power, it plays a role in collecting light for a large field-of-view optical system and corrects axial chromatic aberration at the same time. By providing the second lens 2, it is used to reduce the volume of the lens and correct off-axis aberration. By providing the third lens 3, it can correct system chromatic aberration and spherical aberration. By providing the fourth lens 4, it can correct system chromatic aberration and field curvature and increase the system aperture. By providing the fifth lens 5, it can correct chromatic aberration. By providing the sixth lens 6 and the seventh lens 7, it can correct system chromatic aberration, spherical aberration, and field curvature, and ensure the imaging performance of the optical system at high and low temperatures, realizing a low-cost, small-distortion, high-definition ultra-wide-angle video lens with an aperture value between 1.8 and 2.8.

[0057] Further, in an embodiment of the present invention, the focal length of the optical lens 100 is f, where: in the first lens 1: the focal length of the first lens 1 is f 1 , the dispersion coefficient of the first lens 1 is Vd 1 , 1.3 < |f1 / f| < 2.6 and / or 40 < Vd 1 <70; and / or, in the second lens 2: the focal length of the second lens 2 is f 2 , 8 < |f 2 / f| < 17; and / or, in the third lens 3: the focal length of the third lens 3 is f 3 , 2.2 < |f 3 / f| < 4.3; and / or, in the fourth lens 4: the focal length of the fourth lens 4 is f 4 , 0.9 < |f 4 / f| < 1.7; and / or, in the fifth lens 5: the focal length of the fifth lens 5 is f 5 , 1.2 < |f 5 / f| < 2.3; and / or, in the sixth lens 6: the focal length of the sixth lens 6 is f 6 , 1.1 < |f 6 / f | < 2.1; and / or, in the seventh lens 7: the focal length of the seventh lens 7 is f 7 , the dispersion coefficient of the seventh lens is Vd 7 , 1.3 < |f 7 / f | < 2.5 and / or 20 ps / nm·km < Vd 7 < 40 ps / nm·km; and / or, the combined focal length of the fourth lens 4 and the fifth lens 5 is f 45 , 1.9 < |f 45 / f | < 3.9. In the first embodiment described above, the focal length of the first lens 1 is f 1 , the dispersion coefficient of the first lens 1 is Vd 1 , 1.3 < |f1 / f | < 2.6 and / or 40 < Vd 1 < 70; in the second embodiment described above, in the second lens 2: the focal length of the second lens 2 is f 2 , 8 < |f 2 / f | < 17; in the third embodiment described above, the focal length of the third lens 3 is f 3 , 2.2 < |f 3 / f | < 4.3; in the fourth embodiment described above, the focal length of the fourth lens 4 is f 4 , 0.9 < |f 4 / f | < 1.7; in the fifth embodiment described above, in the fifth lens 5: the focal length of the fifth lens 5 is f 5 , 1.2 < |f 5 / f | < 2.3; in the sixth embodiment described above, the focal length of the sixth lens 6 is f 6 , 1.1 < |f 6 / f | < 2.1; in the seventh embodiment described above, the focal length of the seventh lens 7 is f 7 , the dispersion coefficient of the seventh lens is Vd 7 , 1.3 < |f 7 / f | < 2.5 and / or 20 ps / nm·km < Vd 7 < 40 ps / nm·km; in the eighth embodiment described above, the combined focal length of the fourth lens 4 and the fifth lens 5 is f 45 , 1.9 < |f 45 / f | < 3.9. Among them, the technical solution of the present invention may include at least one of the eight embodiments described above. Specifically, in one embodiment of the present invention, the eight embodiments described above are included simultaneously to meet the characteristics that the optical lens 100 has small distortion and its field of view angle is greater than or equal to 130°.

[0058] Among them, in an embodiment of the present invention, the optical lens 100 satisfies the following conditions: the total optical length of the optical lens 100 is TTL, and 8 mm < TTL < 18 mm.

[0059] Among them, in another embodiment of the present invention, the optical lens 100 satisfies the following conditions: the focal length of the optical lens 100 is f, the total optical length of the optical lens 100 is TTL, and 5 < TTL / f < 10.

[0060] Furthermore, the object side surface of the first lens 1 is convex, and the image side surface of the first lens 1 is concave; and / or, both the object side surface and the image side surface of the second lens 2 are concave; and / or, both the object side surface and the image side surface of the third lens 3 are convex; and / or, both the object side surface and the image side surface of the fourth lens 4 are convex; and / or, both the object side surface and the image side surface of the fifth lens 5 are concave; and / or, both the object side surface and the image side surface of the sixth lens 6 are concave; and / or, both the object side surface and the image side surface of the seventh lens 7 are concave. In the first embodiment described above, the object side surface of the first lens 1 is convex, and the image side surface of the first lens 1 is concave; in the second embodiment described above, both the object side surface and the image side surface of the second lens 2 are concave; in the third embodiment described above, both the object side surface and the image side surface of the third lens 3 are convex; in the fourth embodiment described above, both the object side surface and the image side surface of the fourth lens 4 are convex; in the fifth embodiment described above, both the object side surface and the image side surface of the fifth lens 5 are concave; in the sixth embodiment described above, both the object side surface and the image side surface of the sixth lens 6 are concave; in the seventh embodiment described above, both the object side surface and the image side surface of the seventh lens 7 are concave. Among them, the technical solution of the present invention may include at least one of the seven embodiments described above. Specifically, in an embodiment of the present invention, the seven embodiments described above are included simultaneously, so that the optical lens 100 satisfies the characteristics of an aperture value of F, 1.8 ≤ F ≤ 2.8, a field of view angle greater than or equal to 130°, and low distortion.

[0061] Furthermore, the materials of the first lens 1, the second lens 2, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are all plastic materials, and the material of the third lens 3 is a glass material. By combining glass lenses and plastic lenses, low cost is achieved and the resolution ability of the lens is improved.

[0062] Furthermore, the first lens 1, the second lens 2, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 are all aspherical lenses, and the third lens 3 is a spherical lens; the use of aspherical lenses greatly shortens the total length of the lens.

[0063] Furthermore, the diameter of the first lens 1 is greater than that of the second lens 2; and / or, the diameter of the second lens 2 is greater than that of the third lens 3; and / or, the diameter of the third lens 3 is greater than that of the fourth lens 4; and / or, the diameter of the fourth lens 4 is less than that of the fifth lens 5; and / or, the diameter of the fifth lens 5 is less than that of the sixth lens 6; and / or, the diameter of the sixth lens 6 is less than that of the seventh lens 7. In the above first embodiment, the diameter of the first lens 1 is greater than that of the second lens 2; in the above second embodiment, the diameter of the second lens 2 is greater than that of the third lens 3; in the above third embodiment, the diameter of the third lens 3 is greater than that of the fourth lens 4; in the above fourth embodiment, the diameter of the fourth lens 4 is less than that of the fifth lens 5; in the above fifth embodiment, the diameter of the fifth lens 5 is less than that of the sixth lens 6; in the above sixth embodiment, the diameter of the sixth lens 6 is less than that of the seventh lens 7. Among them, the technical solution of the present invention may include at least one of the six embodiments described above. Specifically, in an embodiment of the present invention, the six embodiments described above are included simultaneously to effectively reduce the thickness of the optical lens 100.

[0064] In addition, the optical lens 100 further includes a diaphragm disposed between the third lens 3 and the fourth lens 4. With this arrangement, the overall length of the lens is effectively shortened, and at the same time, vignetting is reasonably used to achieve a large aperture and high resolution.

[0065]

[0066]

[0067] It should be noted that in an embodiment of the present invention, the conic coefficients corresponding to the aspherical lenses in the optical lens 100 are shown in Table 1, and the aspherical coefficients are shown in Table 2.

[0068] Table 1

[0069]

[0070] Table 2

[0071] Among them, E-01 represents 10 to the power of -1, and so on, and E-N represents 10 to the power of -N.

[0072] The present invention also provides a photographing device, which includes the optical lens 100 as described above. Since this photographing device adopts all the technical solutions of the above embodiments, it has at least the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0073] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An optical lens, characterized in that, the optical lens has an object side and an image side oppositely arranged along its optical axis direction, and the optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side to the image side; wherein, the first lens, the second lens, the fifth lens, and the seventh lens have negative optical powers; the third lens, the fourth lens, and the sixth lens have positive optical powers; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are fixedly arranged relative to the imaging surface; wherein, the aperture value of the optical lens is F, and 1.8 ≤ F ≤ 2.8; the materials of the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all plastic materials, and the material of the third lens is glass material; the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical lenses, and the third lens is a spherical lens; the focal length of the optical lens is f, wherein: In the first lens: the focal length of the first lens is f1, the Abbe number of the first lens is Vd1, 1.3 < |f1 / f| < 2.6, and 40 < Vd1 < 70; In the second lens: the focal length of the second lens is f2, and 8 < |f2 / f| < 17; In the third lens: the focal length of the third lens is f3, and 2.2 < |f3 / f| < 4.3; In the fourth lens: the focal length of the fourth lens is f4, and 0.9 < |f4 / f| < 1.7; In the fifth lens: the focal length of the fifth lens is f5, and 1.2 < |f5 / f| < 2.3; In the sixth lens: the focal length of the sixth lens is f6, and 1.1 < |f6 / f| < 2.1; In the seventh lens: the focal length of the seventh lens is f7, the Abbe number of the seventh lens is Vd7, 1.3 < |f7 / f| < 2.5, and 20 < Vd7 < 40; the combined focal length of the fourth lens and the fifth lens is f45, and 1.9 < |f45 / f| < 3.

9.

2. The optical lens according to claim 1, characterized in that, the overall optical length of the optical lens is TTL, and 8 mm < TTL < 18 mm.

3. The optical lens according to claim 1, characterized in that, the focal length of the optical lens is f, the overall optical length of the optical lens is TTL, and 5 < TTL / f < 10.

4. The optical lens according to claim 1, characterized in that, the object side of the first lens is set as a convex surface, and the image side of the first lens is set as a concave surface; and / or, both the object side and the image side of the second lens are concave surfaces; and / or, both the object side and the image side of the third lens are convex surfaces; and / or, both the object side and the image side of the fourth lens are convex surfaces; and / or, The object side and the image side of the fifth lens are both concave surfaces; and / or, The object side and the image side of the sixth lens are both convex surfaces; and / or, The object side and the image side of the seventh lens are both concave surfaces.

5. The optical lens according to claim 1, wherein, the diameter of the first lens is larger than the diameter of the second lens; and / or, the diameter of the second lens is larger than the diameter of the third lens; and / or, the diameter of the third lens is larger than the diameter of the fourth lens; and / or, the diameter of the fourth lens is smaller than the diameter of the fifth lens; and / or, the diameter of the fifth lens is smaller than the diameter of the sixth lens; and / or, the diameter of the sixth lens is smaller than the diameter of the seventh lens.

6. The optical lens according to claim 1, wherein, the optical lens further includes a diaphragm disposed between the third lens and the fourth lens.

7. A photographing device, wherein, it includes the optical lens according to any one of claims 1 to 6.

Images