Optical lens

Abstract

An optical lens includes, in order from an object side to an image side, first to seventh lenses having negative, negative, positive, positive, negative, positive, and negative diopters, respectively. The spacing distance between the image side surface of the third lens and the object side surface of the fourth lens is D, and the optical lens satisfies Dgt; and the condition is 5 mm. The optical lens provided by the invention has the characteristics of wide viewing angle, low distortion, good imaging quality and the like.

Description

Technical Field

[0001] The invention relates to an optical lens, and in particular to an optical lens with wide viewing angle, low distortion and good imaging quality. Background Art

[0002] In recent years, as the application of camera devices has become more and more extensive and diverse, the requirements for the optical image quality of camera devices have also increased. In order to increase the competitive advantage in the market, wide viewing angle, low distortion and high image quality have always been the goals that product developers want to pursue.

[0003] Therefore, there is an urgent need to propose a new optical lens that can simultaneously achieve a wide viewing angle, low distortion, and good imaging quality. Summary of the invention

[0004] The invention relates to an optical lens having the characteristics of wide viewing angle, low distortion and good imaging quality.

[0005] The present invention provides an optical lens. The optical lens includes, from the object side to the image side, a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power. The distance between the image side surface of the third lens and the object side surface of the fourth lens is D, and the optical lens satisfies the condition of D>5mm.

[0006] The present invention further proposes an optical lens. The focal length of the optical lens is F, and the optical lens includes, from the object side to the image side, a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power. The distance between the image side surface of the third lens and the object side surface of the fourth lens is D, and the optical lens satisfies the condition of 1.2≤|D / F|≤4.6.

[0007] The present invention further proposes an optical lens. The optical lens includes, from the object side to the image side, a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power. The distance between the image side surface of the third lens and the object side surface of the fourth lens is D, the imaging height of the optical lens is ImgH, and the optical lens satisfies the condition of 1.1≤|D / ImgH|≤3.4.

[0008] In order to better understand the above and other aspects of the present invention, embodiments are given below and described in detail with reference to the accompanying drawings: BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram of an optical lens according to a first embodiment of the present invention;

[0010] Figure 2 is a schematic diagram of an optical lens according to a second embodiment of the present invention;

[0011] Figure 3A List Figure 1 Detailed information on the parameters of each lens of the specific implementation method of the optical lens;

[0012] Figure 3B List Figure 1 The aspheric mathematical coefficients of the optical lens;

[0013] Figure 4A List Figure 2 Detailed information on the parameters of each lens of the specific implementation method of the optical lens;

[0014] Figure 4B List Figure 2 The aspheric mathematical coefficients of the optical lens;

[0015] Figure 5 is a schematic diagram of an optical lens according to a third embodiment of the present invention;

[0016] Figure 6 is a schematic diagram of an optical lens according to a fourth embodiment of the present invention;

[0017] Figure 7 is a schematic diagram of an optical lens according to a fifth embodiment of the present invention;

[0018] Figure 8 is a schematic diagram of an optical lens according to a sixth embodiment of the present invention;

[0019] Fig.9A List Figure 7 Detailed information on the parameters of each lens of the specific implementation method of the optical lens;

[0020] Fig. 9B List Figure 7 The aspheric mathematical coefficients of the optical lens;

[0021] Fig. 10A List Figure 8 Detailed information on the parameters of each lens of the specific implementation method of the optical lens;

[0022] Fig. 10B List Figure 8 The aspheric mathematical coefficients of the optical lens; and

[0023] Fig.11 List Figure 3A, 4A , 9A, and 10A optical lenses. DETAILED DESCRIPTION

[0024] The following will describe in detail various embodiments of the present invention, with accompanying drawings as examples. In addition to these detailed descriptions, the present invention can also be widely implemented in other embodiments, and any easy replacement, modification, and equivalent changes of the embodiments are included in the scope of this case and are subject to the scope of the subsequent patent. In the description of the specification, many specific details are provided to give readers a more complete understanding of the present invention; however, the present invention may still be implemented on the premise of omitting some or all of these specific details. In addition, well-known steps or elements are not described in detail to avoid unnecessary limitations on the present invention. The same or similar elements in the drawings will be represented by the same or similar symbols. It should be noted that the drawings are for illustration only and do not represent the actual size or quantity of the elements unless otherwise specified.

[0025] Figure 1 is a schematic diagram of an optical lens OL1 according to a first embodiment of the present invention; Figure 2 Schematic diagram of an optical lens OL2 according to a second embodiment of the present invention. In order to show the features of the embodiment, only the structures related to the embodiment of the present invention are shown, and the remaining structures can be designed by those skilled in the art and are omitted here.

[0026] The optical lenses OL1 and OL2 have at least the characteristics of wide viewing angle, low distortion and good imaging quality, and can be applied to a device with image projection or image capture function, including but not limited to a handheld computer system, a handheld communication system, a drone, a sports camera lens, a car camera lens, a surveillance system, a webcam, a digital camera, a digital video camera or a projector, etc.

[0027] Please refer to Figure 1 and Figure 2 , the left side is the object side, and the right side is the image-forming side. The light beam can penetrate each lens in the optical lenses OL1 and OL2 from the object side and form an image on the imaging surface IMA of the image side. The optical lenses OL1 and OL2 can include a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7 in sequence from the object side to the image side along the optical axis OA. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can each have a refractive power.

[0028] In some embodiments, the first lens L1 may have negative refractive power; the second lens L2 may have negative refractive power; the third lens L3 may have positive refractive power; the fourth lens L4 may have positive refractive power; the fifth lens L5 may have negative refractive power; the sixth lens L6 may have positive refractive power; and the seventh lens L7 may have negative refractive power.

[0029] In some embodiments, the viewing angle of the optical lenses OL1 and OL2 is FOV, and the optical lenses OL1 and OL2 may satisfy at least one of the conditions of 160°≤FOV, 180°≤FOV, FOV≤200°, and FOV≤220°.

[0030] In some embodiments, the distance between the image-side surface S6 of the third lens L3 and the object-side surface S7 of the fourth lens L4 on the optical axis OA is D, and the optical lenses OL1 and OL2 may satisfy the condition of D>5mm, D>5.5mm or D>6mm; in addition, in some other embodiments, the optical lenses OL1 and OL2 may satisfy at least one of the conditions of D<11mm, D<13mm and D<15mm.

[0031] In some embodiments, the focal length of the optical lenses OL1 and OL2 is F, and the optical lenses OL1 and OL2 may satisfy at least one of the conditions of 1.2≤|D / F|, 1.5≤|D / F|, 1.8≤|D / F|, 2≤|D / F|, |D / F|≤4, |D / F|≤4.5, |D / F|≤5, and |D / F|≤5.3.

[0032] The optical lenses OL1 and OL2 can converge the light beams passing through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 to the imaging plane IMA. In some embodiments, if the imaging height of an object on the imaging plane IMA is ImgH, that is, the radius of the imaging circle on the imaging plane IMA is ImgH, then the optical lenses OL1 and OL2 can satisfy at least one of the conditions of 1<|D / ImgH|, 1.1≤|D / ImgH|, 1.3≤|D / ImgH|, |D / ImgH|≤2.5, |D / ImgH|≤2.8, |D / ImgH|≤3 and |D / ImgH|≤3.4.

[0033] In some embodiments, the optical lenses OL1 and OL2 may satisfy at least one of the following conditions: 1.35≤|ImgH / F|, 1.45≤|ImgH / F|, |ImgH / F|≤1.6, or |ImgH / F|≤1.65.

[0034] In some embodiments, the first lens L1, the second lens L2 and the third lens L3 may have positive or negative refractive power as a whole, and the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 may have positive refractive power as a whole.

[0035] In some embodiments, the equivalent focal lengths of the first lens L1, the second lens L2, and the third lens L3 are F123, the equivalent focal lengths of the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are F4567, and the optical lenses OL1 and OL2 may satisfy at least one of the following conditions: 1.2≤|F123 / F4567|, 1.5≤|F123 / F4567|, 1.8≤|F123 / F4567|, 2≤|F123 / F4567|, |F123 / F4567|≤10.5, |F123 / F4567|≤11, and |F123 / F4567|≤12.

[0036] In some embodiments, the optical lenses OL1 and OL2 may satisfy at least one of the following conditions: 5≤|F123 / F|, 6≤|F123 / F|, |F123 / F|≤21.5, or |F123 / F|≤25.

[0037] In some embodiments, the optical lenses OL1 and OL2 may satisfy at least one of the following conditions: 1.5≤|F4567 / F|, 1.8≤|F4567 / F|, 2≤|F4567 / F|, |F4567 / F|≤3.2, |F4567 / F|≤3.5, and |F4567 / F|≤3.8.

[0038] In some embodiments, the focal length of the first lens L1 is F1, and the optical lenses OL1 and OL2 may satisfy at least one of the conditions of 3.8≤|F1 / F|, 4.2≤|F1 / F|, 4.5≤|F1 / F|, |F1 / F|≤5.7, |F1 / F|≤6.0, and |F1 / F|≤6.5.

[0039] In some embodiments, the focal length of the fourth lens L4 is F4, and the optical lenses OL1 and OL2 may satisfy at least one of the conditions of 0.8≤|F4 / F|, 1≤|F4 / F|, |F4 / F|≤1.5, and |F4 / F|≤1.8.

[0040] Furthermore, in some embodiments, the refractive index and Abbe number of the first lens L1 are N1 and V1, the refractive index and Abbe number of the second lens L2 are N2 and V2, the refractive index and Abbe number of the third lens L3 are N3 and V3, the refractive index and Abbe number of the fourth lens L4 are N4 and V4, the refractive index and Abbe number of the fifth lens L5 are N5 and V5, the refractive index and Abbe number of the sixth lens L6 are N6 and V6, and the refractive index and Abbe number of the seventh lens L7 are N7 and V7. The optical lenses OL1 and OL2 may satisfy at least one of the following conditions: N1-N2≥0.1, N3-N2≥0.1, N5-N4≥0.1, N5-N6≥0.1, N5-N7≥0.1, V1-V2≥15, V4-V5≥15, V6-V5≥15, and V7-V5≥15. In some other embodiments, the optical lenses OL1 and OL2 may satisfy at least one of the following conditions: N1-N2>0, N3-N2>0, N5-N4>0, N5-N6>0, and N5-N7>0.

[0041] In some embodiments, the refractive index of the first lens L1 and / or the third lens L3 may vary with temperature. The rate of change of the refractive index of the first lens L1 with temperature is Δn1 / ΔT=dn1 / dT; the rate of change of the refractive index of the third lens L3 with temperature is Δn3 / ΔT=dn3 / dT. The optical lenses OL1 and OL2 may satisfy at least one of the conditions of -5×10-6≤dn1 / dT≤5×10-6 and -5×10-6≤dn3 / dT≤5×10-6.

[0042] In some embodiments, the optical lenses OL1 and OL2 may further include an aperture ST and a protective film C. In another embodiment, an image capture unit (not shown) may be provided on the imaging surface IMA, which may perform photoelectric conversion on the light beams penetrating the optical lenses OL1 and OL2. The aperture ST may be provided between the third lens L3 and the fourth lens L4, the protective film C may be provided between the seventh lens L7 and the imaging surface IMA, and a filter film (not shown) may be formed on the protective film C. In another embodiment, a protective film C may be used that integrates the functions of protecting the image capture unit and filtering the infrared light beam.

[0043] In addition, in some embodiments, the first lens L1 to the seventh lens L7 may be respectively a glass lens made of a glass material or a plastic lens made of a plastic material. The material of the plastic lens may include, but is not limited to, polycarbonate, cycloolefin copolymer (e.g., APEL), and polyester resin (e.g., OKP4 or OKP4HT), etc., or may be a mixed and / or compound material including at least one of the above three. In some embodiments, the optical lenses OL1 and OL2 may be made of at least 5 plastic lenses, so that the optical lenses OL1 and OL2 have the characteristics of low cost. For example, in some specific embodiments, the first lens L1 is a glass lens, and the second lens L2 to the seventh lens L7 are plastic lenses; in other specific embodiments, the first lens L1 and the third lens L3 are glass lenses, and the second lens L2, the fourth lens L4 to the seventh lens L7 are plastic lenses, but the present invention is not limited thereto.

[0044] Furthermore, in some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 may be spherical lenses or aspherical lenses, respectively. In some specific embodiments, the second lens L2 to the seventh lens L7 are all aspherical lenses; in other specific embodiments, the second lens L2, the fourth lens L4 to the seventh lens L7 are all aspherical lenses.

[0045] Specifically, each aspheric lens has at least one aspheric surface, that is, the object side surface and / or the image side surface of the aspheric lens is an aspheric surface. And each aspheric surface can satisfy the following mathematical formula:

[0046] Among them, Z is the coordinate value in the direction of the optical axis OA, with the light transmission direction as the positive direction, A2, A4, A6, A8 and A10 are aspheric coefficients, K is the quadratic constant, C=1 / r, r is the radius of curvature, and Y is the coordinate value orthogonal to the direction of the optical axis OA, with the direction away from the optical axis OA as the positive direction. In addition, the values ​​of each parameter or coefficient of the mathematical formula of each aspheric surface can be set separately to determine the focal length of each position point of the aspheric surface.

[0047] Figure 3A List Figure 1The detailed information of each lens parameter of the specific implementation of the optical lens OL1 includes the radius of curvature, thickness, refractive index and Abbe number (chromatic aberration coefficient) of each lens. The surface codes S1~S6, ST, S7~S16 are arranged in sequence from the object side to the image side, for example: "ST" represents the aperture surface of the aperture St, "S1" represents the object side surface S1 of the first lens L1, "S2" represents the image side surface S2 of the first lens L1... etc. In addition, "thickness" represents the distance between the surface and a surface adjacent to the image side. For example, the "thickness" of the object side surface S1 is the distance between the object side surface S1 and the image side surface S2 of the first lens L1.

[0048] also, Figure 3B List Figure 1 If the surfaces of the second lens L2 to the seventh lens L7 of the optical lens OL1 are aspherical surfaces, the coefficients in the aspherical mathematical formula can be as follows: Figure 3B shown.

[0049] Figure 4A List Figure 2 The detailed information of each lens parameter of the specific implementation of the optical lens OL2, the definition and meaning of which are roughly the same as Figure 3A same.

[0050] also, Figure 4B List Figure 2 If the surfaces of the second lens L2, the fourth lens L4 to the seventh lens L7 of the optical lens OL2 are aspherical surfaces, the coefficients in the aspherical mathematical formula can be as follows: Figure 4B shown.

[0051] Figure 5 is a schematic diagram of an optical lens OL3 according to a third embodiment of the present invention; Figure 6 FIG. 2 is a schematic diagram of an optical lens OL4 according to a fourth embodiment of the present invention. Figure 5 and Figure 6 As shown, the optical lenses OL3 and OL4 are roughly similar to the optical lenses OL1 and OL2, and the components generally use the same symbols. Among them, one difference between the optical lenses OL3 and OL4 and the optical lenses OL1 and OL2 is that the optical lenses OL3 and OL4 further include a reflector R, which is arranged between the third lens L3 and the fourth lens L4. The reflector R can change the direction of the light beam so that the device with image projection or image capture function has a more flexible spatial configuration, thereby achieving the characteristic of reducing the size of the device.

[0052] In some embodiments, the mirror R has a reflective surface SR. The distance between the image-side surface S6 of the third lens L3 and the reflective surface SR on the optical axis OA is d1, and the distance between the reflective surface SR and the object-side surface S7 of the fourth lens L4 on the optical axis OA is d2, and D = d1 + d2. In some specific embodiments, d1 = d2 = 0.5D, but the present invention is not limited thereto. In some other specific embodiments, d1 ≠ d2 may also be adopted to conform to the spatial configuration plan.

[0053] In some embodiments, the angle between the reflective surface SR and the optical axis OA is θ, and the optical lenses OL3 and OL4 can satisfy the condition of 30° ≤ |θ| ≤ 60°.

[0054] Figure 7 Schematic diagram of the optical lens OL5 according to the fifth embodiment of the present invention; Figure 8 Schematic diagram of the optical lens OL6 according to the sixth embodiment of the present invention.

[0055] As Figure 7 and Figure 8 shown, the optical lens OL5 is substantially similar to the optical lenses OL1 and OL3, and the optical lens OL6 is substantially similar to the optical lenses OL2 and OL4, and each element generally uses the same symbol. Among them, one difference between the optical lenses OL5 and OL6 and the optical lenses OL1 and OL2 is that the optical lenses OL5 and OL6 further include a prism P disposed between the third lens L3 and the fourth lens L4. In other words, the difference between the optical lenses OL5 and OL6 and the optical lenses OL3 and OL4 is that the optical lenses OL5 and OL6 use a prism P to replace the mirror R to change the traveling direction of the light beam.

[0056] In some embodiments, the prism P has a reflective surface SR. The distance between the image-side surface S6 of the third lens L3 and the reflective surface SR on the optical axis OA is d1, and the distance between the reflective surface SR and the object-side surface S7 of the fourth lens L4 on the optical axis OA is d2, and D = d1 + d2. In some specific embodiments, d1 = d2 = 0.5D, but the present invention is not limited thereto. In some other specific embodiments, d1 ≠ d2 may also be adopted to conform to the spatial configuration plan.

[0057] In some embodiments, the angle between the reflective surface SR and the optical axis OA is θ, and the optical lenses OL5 and OL6 can satisfy the condition of 30° ≤ |θ| ≤ 60°.

[0058] In some embodiments, the prism P has a refractive index and Abbe number of Np and Vp, and the optical lenses OL5 and OL6 can satisfy at least one of the following conditions: Np ≥ 1.7, Np ≤ 1.9, Np ≤ 1.95, 20 < Vp, 23 ≤ Vp, and 50 ≥ Vp.

[0059] As Figure 1 , Figure 2 and Figures 5 to 8 As shown, the object-side surface S1 and the image-side surface S2 of the first lens L1 may be a convex surface convex toward the object side and a concave surface concave toward the object side, respectively, and the object-side surface S1 and the image-side surface S2 may both have positive refractive power. The first lens L1 may be a lens with negative refractive power, including but not limited to a convex-concave glass lens or a convex-concave plastic lens with negative refractive power, and may be a spherical lens or an aspherical lens.

[0060] The object-side surface S3 of the second lens L2 may be a concave surface that is concave toward the image side and has a negative refractive power; the image-side surface S4 may be a concave surface that is concave toward the object side or a convex surface that is convex toward the image side and has a positive refractive power or a negative refractive power. The second lens L2 may be a lens with negative refractive power, including but not limited to a biconcave glass lens, a biconcave plastic lens, a concave-convex glass lens or a concave-convex plastic lens with negative refractive power, and may be a spherical lens or an aspherical lens.

[0061] The object-side surface S5 of the third lens L3 may be a convex surface convex toward the object side or a concave surface concave toward the side, which has a positive refractive power or a negative refractive power; the image-side surface S6 may be a convex surface convex toward the image side, which has a negative refractive power. The third lens L3 may be a lens with positive refractive power, including but not limited to a biconvex glass lens, a biconvex plastic lens, a concave-convex glass lens or a concave-convex plastic lens with positive refractive power, and may be a spherical lens or an aspherical lens.

[0062] The object-side surface S7 of the fourth lens L4 may be a convex surface convex toward the object side, which has a positive refractive power; the image-side surface S8 may be a convex surface convex toward the image side, which has a negative refractive power. The fourth lens L4 may be a lens with positive refractive power, including but not limited to a biconvex glass lens or a biconvex plastic lens with positive refractive power, and may be a spherical lens or an aspherical lens.

[0063] The object-side surfaces S9 and S13 of the fifth lens L5 and the seventh lens L7 may be concave surfaces concave toward the image side, and have negative refractive power; the image-side surfaces S10 and S14 may be concave surfaces concave toward the object side, and have positive refractive power. The fifth lens L5 and the seventh lens L7 may each be a lens with negative refractive power, including but not limited to a biconcave glass lens or a biconcave plastic lens with negative refractive power, and may be a spherical lens or an aspherical lens respectively.

[0064] The object-side surface S11 of the sixth lens L6 may be a convex surface convex toward the object side or a concave surface concave toward the image side, which has a positive refractive power or a negative refractive power; the image-side surface S12 may be a convex surface convex toward the image side, which has a negative refractive power. The sixth lens L6 may be a lens with positive refractive power, including but not limited to a biconvex glass lens, a biconvex plastic lens, a concave-convex glass lens or a concave-convex plastic lens with positive refractive power, and may be a spherical lens or an aspherical lens respectively.

[0065] Fig.9A List Figure 7 The detailed information of each lens parameter of the specific implementation of the optical lens OL5, the definition and meaning of which are roughly the same as Figure 3A The surface codes S1-S6, SP1, SP2, ST, S7-S16 are arranged in sequence from the object side to the image side, for example, "SP1" and "SP2" represent the object side surface and the image side surface of the prism P respectively.

[0066] also, Fig. 9B List Figure 7 If the surfaces of the second lens L2 to the seventh lens L7 of the optical lens OL5 are aspherical surfaces, the coefficients in the aspherical mathematical formula can be as follows: Fig. 9B shown.

[0067] Fig. 10A List Figure 8 The detailed information of each lens parameter of the specific implementation of the optical lens OL6, the definition and meaning of which are roughly the same as Fig.9A same.

[0068] also, Fig. 10B List Figure 8 If the surfaces of the second lens L2, the fourth lens L4 to the seventh lens L7 of the optical lens OL6 are aspherical surfaces, the coefficients in the aspherical mathematical formula can be as follows: Fig. 10B shown.

[0069] Fig.11 List Figure 3A , 4A , 9A, 10A optical lenses OL1, OL2, OL5, OL6 specific parameters.

[0070] It can be seen from the above embodiments that the optical lens proposed in the present invention has the characteristics of wide viewing angle, low distortion and good imaging quality.

[0071] In summary, although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. An optical lens, characterized in that: The optical lens has a focal length of F and an imaging height of ImgH, and includes, from the object side to the image side, the following: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens having positive refractive power; and a seventh lens having negative refractive power, the image side surface of the third lens and the object side surface of the fourth lens being separated by a distance D, and the optical lens satisfying the condition of D>5mm or 1.35≤|ImgH / F|≤1.

65.

2. An optical lens, characterized in that: The optical lens has a focal length of F and an imaging height of ImgH, and includes, from the object side to the image side, the following: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens having positive refractive power; and a seventh lens having negative refractive power, the image side surface of the third lens and the object side surface of the fourth lens are separated by a distance D, and the optical lens satisfies the condition of 1.2≤|D / F|≤5.

3.

3. An optical lens, characterized in that: The optical lens has a focal length of F and an imaging height of ImgH, and includes, from the object side to the image side, the following: a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens having positive refractive power; and a seventh lens having negative refractive power, wherein the image-side surface of the third lens and the object-side surface of the fourth lens are separated by a distance D, and the optical lens satisfies the condition of 1<|D / ImgH|≤3.

4.

4. The optical lens according to any one of claims 1 to 3, characterized in that: It further comprises a reflector or a prism with a reflective surface, which is disposed between the third lens and the fourth lens.

5. The optical lens according to claim 4, characterized in that: The angle between the reflection surface and one of the optical axes of the optical lens is θ, and the optical lens satisfies the condition of 30°≤|θ|≤60°.

6. The optical lens according to any one of claims 1 to 3, characterized in that: The equivalent focal lengths of the first lens, the second lens and the third lens are F123, the equivalent focal lengths of the fourth lens, the fifth lens, the sixth lens and the seventh lens are F4567, and the optical lens satisfies at least one of the following conditions: 5≤|F123 / F|≤25, 1.5≤|F4567 / F|≤3.8, and 1.2≤|F123 / F4567|≤12.

7. The optical lens according to any one of claims 1 to 3, characterized in that: The focal length of the first lens is F1, the focal length of the fourth lens is F4, and the optical lens satisfies at least one of the following conditions: 3.8≤|F1 / F|≤6.5 and 0.8≤|F4 / F|≤1.

8.

8. The optical lens according to any one of claims 1 to 3, characterized in that: The first lens has a refractive index and an Abbe number of N1 and V1, the second lens has a refractive index and an Abbe number of N2 and V2, the third lens has a refractive index and an Abbe number of N3 and V3, the fourth lens has a refractive index and an Abbe number of N4 and V4, the fifth lens has a refractive index and an Abbe number of N5 and V5, the sixth lens has a refractive index and an Abbe number of N6 and V6, the seventh lens has a refractive index and an Abbe number of N7 and V7, and the optical lens satisfies at least one of the following conditions: N1-N2>0, N3-N2>0, N5-N4>0, N5-N6>0, N5-N7>0, V1-V2≥15, V4-V5≥15, V6-V5≥15 and V7-V5≥15.

9. The optical lens according to any one of claims 1 to 3, characterized in that: It further includes a prism disposed between the third lens and the fourth lens, wherein the prism has a refractive index and an Abbe number of Np and Vp, and the optical lens satisfies at least one of the following conditions: Np≥1.7 and 50≥Vp.

10. The optical lens according to any one of claims 1 to 3, characterized in that: The rate of change of the refractive index of the first lens with temperature is dn1 / dT, the rate of change of the refractive index of the third lens with temperature is dn3 / dT, and the optical lens satisfies at least one of the following conditions: -5×10-6≤dn1 / dT≤5×10-6 and -5×10-6≤dn3 / dT≤5×10-6.

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