Optical lens

Abstract

The utility model provides an optical lens. The optical lens comprises a lens barrel, eight lenses and a plurality of spacers, wherein the eight lenses comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the plurality of spacers includes a third spacer; the following conditions are satisfied: 0.5 lt; tan (FOV / 4) / Fnolt; 1; the refractive index N1 of the first lens and the refractive index N2 of the second lens meet the following condition: 1lt; n1 / N2lt; 1.5 parts; the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d3s of the object side surface of the third spacer, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens and the center thickness CT3 of the third lens satisfy 3.5 lt; (d0s-d3s) / (CT1 + CT2 + CT3) lt; and 5.5 parts by weight. According to the utility model, the problems of poor assembly stability and serious stray light of an optical lens in the prior art under the condition of satisfying an ultra-wide angle are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging devices, and more particularly to an optical lens. Background Art

[0002] With the development of technology, the use scenarios of ultra-wide-angle lenses have gradually expanded due to their wider field of view than ordinary lenses. Nowadays, ultra-wide-angle lenses are not only applied to mobile phone camera lenses, but also widely used in automotive cameras and UAV obstacle avoidance lenses. A larger field of view can help vehicles and UAVs better perceive the surrounding environment. However, in application scenarios such as automotive cameras and UAV obstacle avoidance lenses, the environment in which the optical lens works changes greatly, so it is very easy to be affected by factors such as temperature or external pressure, resulting in difficulty in ensuring the assembly stability of some lenses in the optical lens, and thus causing the spacer in contact with it to deform, generating stray light and affecting the imaging quality.

[0003] That is to say, the optical lens in the prior art has problems of poor assembly stability and serious stray light when meeting the ultra-wide angle. Summary of the Utility Model

[0004] The main purpose of the present utility model is to provide an optical lens to solve the problems of poor assembly stability and serious stray light existing in the optical lens in the prior art.

[0005] To achieve the above object, according to one aspect of the present utility model, there is provided an optical lens, including a lens barrel and eight lenses and a plurality of spacers disposed in the lens barrel. The lens barrel has a central through hole centered on the optical axis. The eight lenses include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens in sequence from the object side to the image side along the optical axis. The plurality of spacers at least includes a third spacer located on the image side of the third lens and in contact with the image side surface of the third lens. The following relationships are satisfied between the maximum field of view FOV of the optical lens and the aperture coefficient Fno of the optical lens: 0.5 < tan(FOV / 4) / Fno < 1; the following relationship is satisfied between the refractive index N1 of the first lens and the refractive index N2 of the second lens: 1 < N1 / N2 < 1.5; the following relationship is satisfied between the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d3s of the object side surface of the third spacer, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the central thickness CT3 of the third lens: 3.5 < (d0s - d3s) / (CT1 + CT2 + CT3) < 5.5.

[0006] Furthermore, the following conditions are satisfied between the effective focal length f1 of the first lens and the effective focal length f2 of the second lens: 1 < f1 / f2 < 1.8; the plurality of spacers further includes a second spacer, the second spacer is located on the image side of the second lens and contacts the image side surface of the second lens, and the following conditions are satisfied among the axial distance EP02 from the object side surface of the lens barrel to the object side surface of the second spacer, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens: 0.5 < EP02 / (CT1 + CT2) < 2.5.

[0007] Furthermore, the following conditions are satisfied among the effective radius DT11 of the object side surface of the first lens, the inner diameter d0m of the image side surface of the lens barrel, the effective focal length f1 of the first lens, and the effective focal length f of the optical lens: -6 < f1 / f < -4 and 0.7 < DT11 / d0m < 2.

[0008] Furthermore, the on-axis distance TD from the object side surface of the first lens to the image side surface of the eighth lens is greater than the on-axis distance L from the object side surface of the lens barrel to the image side surface; the following conditions are satisfied among the on-axis distance TD from the object side surface of the first lens to the image side surface of the eighth lens, the on-axis distance L from the object side surface of the lens barrel to the image side surface, the center thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens: -0.1 < (TD - L - CT1) / (R1 - R2) < 0.2.

[0009] Furthermore, the first lens is a glass lens, and the following conditions are satisfied between the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the center thickness CT1 of the first lens: 1 < T12 / CT1 < 3.5; the following conditions are satisfied between the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the outer diameter D0s of the object side surface of the lens barrel: 5 < D0s / T12 < 7.

[0010] Furthermore, the plurality of spacers further includes a fifth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, and the following conditions are satisfied between the on-axis distance CP5 from the object side surface to the image side surface of the fifth spacer and the on-axis distance T56 from the image side surface of the fifth lens to the object side surface of the sixth lens: 6 < CP5 / T56 < 9.

[0011] Furthermore, the following relationships are satisfied among the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the radius of curvature R10 of the image side surface of the fifth lens, and the radius of curvature R11 of the object side surface of the sixth lens: 0.9 < (f5 - f6) / (R10 + R11) < 1; the plurality of spacers further includes a fifth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, and the following relationships are satisfied among the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d5s of the object side surface of the fifth spacer, the inner diameter d0m of the image side surface of the lens barrel, and the inner diameter d5m of the image side surface of the fifth spacer: 2 < (d0s - d5s) / (d0m - d5m) < 10.

[0012] Furthermore, the following relationship is satisfied among the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens: 2 < (f4 + f5 + f6) / f5 < 3; the plurality of spacers further includes a second spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer, the second spacer is located on the image side of the second lens and contacts the image side surface of the second lens, the fourth spacer is located on the image side of the fourth lens and contacts the image side surface of the fourth lens, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, the sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens, the seventh spacer is located on the image side of the seventh lens and contacts the image side surface of the seventh lens, and the following relationship is satisfied: 0.3 < CP5 / ∑CPi < 1, where i = 2, 3, 4, 5, 6, 7, CP5 is the maximum axial thickness of the fifth spacer, and ∑CPi is the sum of the maximum axial thicknesses of the second spacer, the third spacer, the fourth spacer, the fifth spacer, the sixth spacer, and the seventh spacer.

[0013] Furthermore, the plurality of spacers further includes a fifth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, and the following relationship is satisfied among the maximum axial thickness CP5 of the fifth spacer, the displacement SAG52 on the axis from the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens, the on-axis distance T56 from the image side surface of the fifth lens to the object side surface of the sixth lens, and the displacement SAG61 on the axis from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens: 30 < CP5 / (SAG52 + T56 + SAG61) < 150.

[0014] Further, the plurality of spacers further includes a sixth spacer, the sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens, and the following conditions are satisfied between the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens: (|f6| - |f7|) / |f6| < 0.1; the following conditions are satisfied between the inner diameter d6s of the object side surface of the sixth spacer, the outer diameter D6s of the object side surface of the sixth spacer, the central thickness CT6 of the sixth lens and the central thickness CT7 of the seventh lens: 3 < (d6s + D6s) / (CT6 + CT7) < 5.

[0015] Further, the plurality of spacers further includes a sixth spacer, the sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens, and the following conditions are satisfied between the combined focal length f67 of the sixth lens and the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer and the inner diameter d6m of the image side surface of the sixth spacer: 9 < f67 / (D6m - d6m) < 17.

[0016] Further, the following conditions are satisfied between the outer diameter D0s of the object side surface of the lens barrel, the outer diameter D0m of the image side surface of the lens barrel and the effective focal length f of the optical lens: 2 < (D0s - D0m) / f < 13; the following conditions are satisfied between the Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens and the Abbe number V7 of the seventh lens: V6 > V5 + V7.

[0017] Further, the sixth lens is a glass lens, the plurality of spacers further includes a fifth spacer and a sixth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, the sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens, and the following conditions are satisfied between the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R11 of the object side surface of the sixth lens: 5 < (R12 - R11) / (R12 + R11) < 6; the following conditions are satisfied between the central thickness CT6 of the sixth lens and the axial distance EP56 from the image side surface of the fifth spacer to the object side surface of the sixth spacer: 2 < CT6 / EP56 < 3.

[0018] Further, the plurality of spacers further includes a sixth spacer and a seventh spacer, the sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens, the seventh spacer is located on the image side of the seventh lens and contacts the image side surface of the seventh lens, and the following conditions are satisfied between the displacement SAG62 on the axis from the intersection point of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens and the displacement SAG81 on the axis from the intersection point of the object side surface of the eighth lens and the optical axis to the effective radius vertex of the object side surface of the eighth lens: -1 < SAG62 / SAG81 < -0.5; the following conditions are satisfied between the Abbe number V7 of the seventh lens and the Abbe number V8 of the eighth lens: V8 > 2*V7; the following conditions are satisfied between the inner diameter d7s of the object side surface of the seventh spacer and the inner diameter d6m of the image side surface of the sixth spacer: 1 < d7s / d6m < 1.5.

[0019] Furthermore, the following condition is satisfied between the inner diameter d0m of the image side of the lens barrel and the outer diameter D6s of the object side of the sixth spacer: 1 < d0m / D6s < 1.5.

[0020] Furthermore, the plurality of spacers further includes a sixth spacer and a seventh spacer. The sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens. The seventh spacer is located on the image side of the seventh lens and contacts the image side surface of the seventh lens. The following condition is satisfied among the maximum axial thickness CP6 of the sixth spacer, the on-axis distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh lens, the maximum axial thickness CP7 of the seventh spacer, the on-axis displacement SAG62 of the intersection point of the image side surface of the sixth lens and the optical axis to the effective radius vertex on the axis of the image side surface of the sixth lens, and the on-axis displacement SAG81 of the intersection point of the object side surface of the eighth lens and the optical axis to the effective radius vertex on the axis of the object side surface of the eighth lens: 2 < (CP6 + EP67 + CP7) / (SAG62 + SAG81) < 16.

[0021] Furthermore, the plurality of spacers further includes a seventh auxiliary spacer. The seventh auxiliary spacer is located on the image side of the seventh spacer and contacts the seventh spacer. The following condition is satisfied among the maximum axial thickness CP6 of the sixth spacer, the on-axis distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh lens, the maximum axial thickness CP7 of the seventh spacer, the maximum axial thickness CP7b of the seventh auxiliary spacer, the on-axis displacement SAG62 of the intersection point of the image side surface of the sixth lens and the optical axis to the effective radius vertex on the axis of the image side surface of the sixth lens, and the on-axis displacement SAG81 of the intersection point of the object side surface of the eighth lens and the optical axis to the effective radius vertex on the axis of the object side surface of the eighth lens: 5 < (CP6 + EP67 + CP7 + CP7b) / (SAG62 + SAG81) < 20.

[0022] Furthermore, the maximum effective radii of the first lens to the fourth lens decrease one by one. Among the plurality of spacers, the inner diameter value of the object side surface of the fourth spacer is the smallest. The plurality of spacers further includes a second spacer and a fourth spacer. The second spacer is located on the image side of the second lens and contacts the image side surface of the second lens. The fourth spacer is located on the image side of the fourth lens and contacts the image side surface of the fourth lens. The following conditions are satisfied among the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens: 2 < |f1 + f2| / |f3 + f4| < 15; the following condition is satisfied among the inner diameter d2s of the object side surface of the second spacer, the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d4s of the object side surface of the fourth spacer, and the inner diameter d2m of the image side surface of the second spacer: 5 < (d2s - d0s) / (d4s - d2m) < 10.

[0023] Furthermore, the multiple spacers further include a fourth spacer and a fifth spacer. The fourth spacer is located on the image side of the fourth lens and contacts the image-side surface of the fourth lens. The fifth spacer is located on the image side of the fifth lens and contacts the image-side surface of the fifth lens. The on-axis distance EP34 from the image-side surface of the third spacer to the object-side surface of the fourth spacer, the on-axis distance EP45 from the image-side surface of the fourth spacer to the object-side surface of the fifth spacer, and the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy: 0.8 < (EP34 / EP45) / (CT4 / CT5) < 2.

[0024] Furthermore, the multiple spacers further include a second spacer. The second spacer is located on the image side of the second lens and contacts the image-side surface of the second lens. The on-axis distance EP23 from the image-side surface of the second spacer to the object-side surface of the third spacer and the center thickness CT3 of the third lens satisfy: 1 < EP23 / CT3 < 1.6.

[0025] According to another aspect of the present invention, an optical lens is further provided, which includes a lens barrel and eight lenses and multiple spacers arranged in the lens barrel. The lens barrel has a central through hole, and the central through hole is arranged with the optical axis as the central axis; the eight lenses sequentially include a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a positive optical power, a sixth lens with a positive optical power, a seventh lens with a negative optical power, and an eighth lens with a positive optical power from the object side to the image side along the optical axis; the multiple spacers at least include a third spacer, and the third spacer is located on the image side of the third lens and contacts the image-side surface of the third lens; the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: 1 < N1 / N2 < 1.5; the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d0s of the object-side surface of the lens barrel, and the inner diameter d3s of the object-side surface of the third spacer satisfy: -2 < (f1 + f2 + f3) / (d0s - d3s) < -0.5.

[0026] According to another aspect of the present utility model, there is also provided an optical lens, which includes a lens barrel and eight lenses and a plurality of spacers disposed in the lens barrel. The lens barrel has a central through hole, and the central through hole is arranged with the optical axis as the central axis; the eight lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens from the object side to the image side; the plurality of spacers at least includes a sixth spacer, the sixth spacer is located on the image side of the sixth lens and is in contact with the image side surface of the sixth lens. The following relationship is satisfied between the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens: (|f6| - |f7|) / |f6| < 0.1; the following relationship is satisfied between the inner diameter d6s of the object side surface of the sixth spacer, the outer diameter D6s of the object side surface of the sixth spacer, the central thickness CT6 of the sixth lens, and the central thickness CT7 of the seventh lens: 3 < (d6s + D6s) / (CT6 + CT7) < 5.

[0027] According to another aspect of the present utility model, there is also provided an optical lens, which includes a lens barrel and eight lenses and a plurality of spacers disposed in the lens barrel. The lens barrel has a central through hole, and the central through hole is arranged with the optical axis as the central axis; the eight lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens from the object side to the image side; the following relationship is satisfied between the outer diameter D0s of the object side surface of the lens barrel, the outer diameter D0m of the image side surface of the lens barrel, and the effective focal length f of the optical lens: 2 < (D0s - D0m) / f < 13; the following relationship is satisfied between the Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens, and the Abbe number V7 of the seventh lens: V6 > V5 + V7.

[0028] Further, the following relationship is satisfied between the maximum field of view FOV of the optical lens and the aperture coefficient Fno of the optical lens: 0.5 < tan(FOV / 4) / Fno < 1.

[0029] Further, the following relationship is satisfied between the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d3s of the object side surface of the third spacer, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the central thickness CT3 of the third lens: 3.5 < (d0s - d3s) / (CT1 + CT2 + CT3) < 5.5.

[0030] Further, the following relationship is satisfied between the effective focal length f1 of the first lens and the effective focal length f2 of the second lens: 1 < f1 / f2 < 1.8; the plurality of spacers further includes a second spacer, the second spacer is located on the image side of the second lens and is in contact with the image side surface of the second lens. The following relationship is satisfied between the axial distance EP02 from the object side surface of the lens barrel to the object side surface of the second spacer, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens: 0.5 < EP02 / (CT1 + CT2) < 2.5.

[0031] Furthermore, the effective radius DT11 of the object side of the first lens, the inner diameter d0m of the image side of the lens barrel, the effective focal length f1 of the first lens, and the effective focal length f of the optical lens satisfy: -6 < f1 / f < -4 and 0.7 < DT11 / d0m < 2.

[0032] Furthermore, the axial distance TD from the object side of the first lens to the image side of the eighth lens is greater than the axial distance L from the object side of the lens barrel to the image side; the axial distance TD from the object side of the first lens to the image side of the eighth lens, the axial distance L from the object side of the lens barrel to the image side, the central thickness CT1 of the first lens, the curvature radius R1 of the object side of the first lens, and the curvature radius R2 of the image side of the first lens satisfy: -0.1 < (TD - L - CT1) / (R1 - R2) < 0.2.

[0033] Furthermore, the first lens is a glass lens, and the axial distance T12 from the image side of the first lens to the object side of the second lens and the central thickness CT1 of the first lens satisfy: 1 < T12 / CT1 < 3.5; the axial distance T12 from the image side of the first lens to the object side of the second lens and the outer diameter D0s of the object side of the lens barrel satisfy: 5 < D0s / T12 < 7.

[0034] Furthermore, the plurality of spacers further includes a fifth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side of the fifth lens, and the axial distance CP5 from the object side to the image side of the fifth spacer and the axial distance T56 from the image side of the fifth lens to the object side of the sixth lens satisfy: 6 < CP5 / T56 < 9.

[0035] Furthermore, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the curvature radius R10 of the image side of the fifth lens, and the curvature radius R11 of the object side of the sixth lens satisfy: 0.9 < (f5 - f6) / (R10 + R11) < 1; the plurality of spacers further includes a fifth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side of the fifth lens, and the inner diameter d0s of the object side of the lens barrel, the inner diameter d5s of the object side of the fifth spacer, the inner diameter d0m of the image side of the lens barrel, and the inner diameter d5m of the image side of the fifth spacer satisfy: 2 < (d0s - d5s) / (d0m - d5m) < 10.

[0036] Further, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: 2 < (f4 + f5 + f6) / f5 < 3; the plurality of spacers further includes a second spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer. The second spacer is located on the image side of the second lens and contacts the image side surface of the second lens. The fourth spacer is located on the image side of the fourth lens and contacts the image side surface of the fourth lens. The fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens. The sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens. The seventh spacer is located on the image side of the seventh lens and contacts the image side surface of the seventh lens, satisfying: 0.3 < CP5 / ∑CPi < 1, where i = 2, 3, 4, 5, 6, 7, CP5 is the maximum axial thickness of the fifth spacer, and ∑CPi is the sum of the maximum axial thicknesses of the second spacer, the third spacer, the fourth spacer, the fifth spacer, the sixth spacer, and the seventh spacer.

[0037] Further, the plurality of spacers further includes a fifth spacer. The fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens. The maximum axial thickness CP5 of the fifth spacer, the displacement SAG52 on the axis from the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens, the axial distance T56 from the image side surface of the fifth lens to the object side surface of the sixth lens, and the displacement SAG61 on the axis from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens satisfy: 30 < CP5 / (SAG52 + T56 + SAG61) < 150.

[0038] Further, the plurality of spacers further includes a sixth spacer. The sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens. The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: (|f6| - |f7|) / |f6| < 0.1; the inner diameter d6s of the object side surface of the sixth spacer, the outer diameter D6s of the object side surface of the sixth spacer, the central thickness CT6 of the sixth lens, and the central thickness CT7 of the seventh lens satisfy: 3 < (d6s + D6s) / (CT6 + CT7) < 5.

[0039] Further, the plurality of spacers further includes a sixth spacer. The sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens. The combined focal length f67 of the sixth lens and the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer, and the inner diameter d6m of the image side surface of the sixth spacer satisfy: 9 < f67 / (D6m - d6m) < 17.

[0040] Furthermore, the following relationships are satisfied among the outer diameter D0s of the object side of the lens barrel, the outer diameter D0m of the image side of the lens barrel, and the effective focal length f of the optical lens: 2 < (D0s - D0m) / f < 13; the following relationships are satisfied among the Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens, and the Abbe number V7 of the seventh lens: V6 > V5 + V7.

[0041] Furthermore, the sixth lens is a glass lens. The plurality of spacers further includes a fifth spacer and a sixth spacer. The fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens. The sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens. The following relationship is satisfied between the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R11 of the object side surface of the sixth lens: 5 < (R12 - R11) / (R12 + R11) < 6; the following relationship is satisfied between the central thickness CT6 of the sixth lens and the axial distance EP56 from the image side surface of the fifth spacer to the object side surface of the sixth spacer: 2 < CT6 / EP56 < 3.

[0042] Furthermore, the plurality of spacers further includes a sixth spacer and a seventh spacer. The sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens. The seventh spacer is located on the image side of the seventh lens and contacts the image side surface of the seventh lens. The following relationship is satisfied between the displacement SAG62 on the axis from the intersection point of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens and the displacement SAG81 on the axis from the intersection point of the object side surface of the eighth lens and the optical axis to the effective radius vertex of the object side surface of the eighth lens: -1 < SAG62 / SAG81 < -0.5; the following relationship is satisfied between the Abbe number V7 of the seventh lens and the Abbe number V8 of the eighth lens: V8 > 2*V7; the following relationship is satisfied between the inner diameter d7s of the object side surface of the seventh spacer and the inner diameter d6m of the image side surface of the sixth spacer: 1 < d7s / d6m < 1.5.

[0043] Furthermore, the following relationship is satisfied between the inner diameter d0m of the image side surface of the lens barrel and the outer diameter D6s of the object side surface of the sixth spacer: 1 < d0m / D6s < 1.5.

[0044] Furthermore, the plurality of spacers further includes a sixth spacer and a seventh spacer. The sixth spacer is located on the image side of the sixth lens and contacts the image-side surface of the sixth lens. The seventh spacer is located on the image side of the seventh lens and contacts the image-side surface of the seventh lens. The following relationship is satisfied among the maximum axial thickness CP6 of the sixth spacer, the on-axis distance EP67 from the image-side surface of the sixth spacer to the object-side surface of the seventh lens, the maximum axial thickness CP7 of the seventh spacer, the displacement SAG62 on the axis from the intersection of the image-side surface of the sixth lens and the optical axis to the effective radius vertex of the image-side surface of the sixth lens, and the displacement SAG81 on the axis from the intersection of the object-side surface of the eighth lens and the optical axis to the effective radius vertex of the object-side surface of the eighth lens: 2 < (CP6 + EP67 + CP7) / (SAG62 + SAG81) < 16.

[0045] Furthermore, the plurality of spacers further includes a seventh auxiliary spacer. The seventh auxiliary spacer is located on the image side of the seventh spacer and contacts the seventh spacer. The following relationship is satisfied among the maximum axial thickness CP6 of the sixth spacer, the on-axis distance EP67 from the image-side surface of the sixth spacer to the object-side surface of the seventh lens, the maximum axial thickness CP7 of the seventh spacer, the maximum axial thickness CP7b of the seventh auxiliary spacer, the displacement SAG62 on the axis from the intersection of the image-side surface of the sixth lens and the optical axis to the effective radius vertex of the image-side surface of the sixth lens, and the displacement SAG81 on the axis from the intersection of the object-side surface of the eighth lens and the optical axis to the effective radius vertex of the object-side surface of the eighth lens: 5 < (CP6 + EP67 + CP7 + CP7b) / (SAG62 + SAG81) < 20.

[0046] Furthermore, the maximum effective radii of the first lens to the fourth lens decrease successively. Among the plurality of spacers, the inner diameter value of the object-side surface of the fourth spacer is the smallest. The plurality of spacers further includes a second spacer and a fourth spacer. The second spacer is located on the image side of the second lens and contacts the image-side surface of the second lens. The fourth spacer is located on the image side of the fourth lens and contacts the image-side surface of the fourth lens. The following relationship is satisfied among the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens: 2 < |f1 + f2| / |f3 + f4| < 15. The following relationship is satisfied among the inner diameter d2s of the object-side surface of the second spacer, the inner diameter d0s of the object-side surface of the lens barrel, the inner diameter d4s of the object-side surface of the fourth spacer, and the inner diameter d2m of the image-side surface of the second spacer: 5 < (d2s - d0s) / (d4s - d2m) < 10.

[0047] Furthermore, the plurality of spacers further includes a fourth spacer and a fifth spacer. The fourth spacer is located on the image side of the fourth lens and contacts the image-side surface of the fourth lens. The fifth spacer is located on the image side of the fifth lens and contacts the image-side surface of the fifth lens. The axial distance EP34 from the image-side surface of the third spacer to the object-side surface of the fourth spacer, the axial distance EP45 from the image-side surface of the fourth spacer to the object-side surface of the fifth spacer, and the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy: 0.8 < (EP34 / EP45) / (CT4 / CT5) < 2.

[0048] Furthermore, the plurality of spacers further includes a second spacer. The second spacer is located on the image side of the second lens and contacts the image-side surface of the second lens. The axial distance EP23 from the image-side surface of the second spacer to the object-side surface of the third spacer and the center thickness CT3 of the third lens satisfy: 1 < EP23 / CT3 < 1.6.

[0049] Applying the technical solution of the present utility model, the optical lens includes a lens barrel and eight lenses and a plurality of spacers disposed in the lens barrel. The lens barrel has a central through hole, and the central through hole is arranged with the optical axis as the central axis. The eight lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens from the object side to the image side. The plurality of spacers at least includes a third spacer, and the third spacer is located on the image side of the third lens and contacts the image-side surface of the third lens. The maximum field of view FOV of the optical lens and the f-number Fno of the optical lens satisfy: 0.5 < tan(FOV / 4) / Fno < 1. The refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: 1 < N1 / N2 < 1.5. The inner diameter d0s of the object-side surface of the lens barrel, the inner diameter d3s of the object-side surface of the third spacer, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the center thickness CT3 of the third lens satisfy: 3.5 < (d0s - d3s) / (CT1 + CT2 + CT3) < 5.5.

[0050] The optical lens of the present application is composed of a lens barrel and eight lenses and multiple spacers arranged in the lens barrel. By reasonably arranging the eight lenses and multiple spacers, and when the optical lens satisfies 0.5 < tan(FOV / 4) / Fno < 1 and 1 < N1 / N2 < 1.5, the optical lens has a larger field of view angle and a lower temperature drift. At the same time, because the refractive indices of the first lens and the second lens are different, the light path between the first lens and the second lens is relatively steep, resulting in a large step difference between the first lens and the second lens, which affects the assembly stability of the first three lenses. Therefore, in the present application, by restricting 3.5 < (d0s - d3s) / (CT1 + CT2 + CT3) < 5.5, by controlling the inner diameter of the object side of the lens barrel, the inner diameter of the object side of the third spacer, and the sum of the central thicknesses of the first lens to the third lens, while controlling the excess incident light and preventing it from entering the backend to generate stray light, it is ensured that the surface shape change of the lens during the assembly process is small, which is beneficial to increasing the assembly stability and further improving the overall reliability of the optical lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0052] Figure 1 The dimension marking diagram of the optical lens of an alternative embodiment of the present utility model is shown;

[0053] Figure 2 The schematic structural diagram of the optical lens of Embodiment 1-1 of the present utility model is shown;

[0054] Figure 3 The schematic structural diagram of the optical lens of Embodiment 1-2 of the present utility model is shown;

[0055] Figure 4 The schematic structural diagram of the optical lens of Embodiment 1-3 of the present utility model is shown;

[0056] Figures 5 to 6 The axial chromatic aberration curve and astigmatism curve of the optical lens of Embodiment 1 of the present utility model are respectively shown;

[0057] Figure 7 The schematic structural diagram of the optical lens of Embodiment 2-1 of the present utility model is shown;

[0058] Figure 8 The schematic structural diagram of the optical lens of Embodiment 2-2 of the present utility model is shown;

[0059] Figure 9Shows a schematic structural diagram of the optical lens of Embodiment 2-3 of the present utility model;

[0060] Figures 10 to 11 Respectively show the axial chromatic aberration curve and astigmatism curve of the optical lens of Embodiment II of the present utility model;

[0061] Figure 12 Shows a schematic structural diagram of the optical lens of Embodiment 3-1 of the present utility model;

[0062] Figure 13 Shows a schematic structural diagram of the optical lens of Embodiment 3-2 of the present utility model;

[0063] Figure 14 Shows a schematic structural diagram of the optical lens of Embodiment 3-3 of the present utility model;

[0064] Figures 15 to 16 Respectively show the axial chromatic aberration curve and astigmatism curve of the optical lens of Embodiment III of the present utility model;

[0065] Figure 17 Shows a schematic diagram of the force applied to the first lens during the assembly of the optical lens of an alternative embodiment of the present utility model;

[0066] Figure 18 Shows a schematic diagram of the axial deformation of the first lens to the fifth lens when the optical lens of an alternative embodiment of the present utility model satisfies tan(FOV / 4) / Fno = 0.77, N1 / N2 = 1.22, and (d0s - d3s) / (CT1 + CT2 + CT3) = 3;

[0067] Figure 18-1 Shows a schematic diagram of the axial deformation of the first lens to the fifth lens when the optical lens of an alternative embodiment of the present utility model satisfies tan(FOV / 4) / Fno = 0.77, N1 / N2 = 1.22, and (d0s - d3s) / (CT1 + CT2 + CT3) = 3.84;

[0068] Figure 18-2 Shows a schematic diagram of the axial deformation of the first lens to the fifth lens when the optical lens of an alternative embodiment of the present utility model satisfies tan(FOV / 4) / Fno = 0.77, N1 / N2 = 1.22, and (d0s - d3s) / (CT1 + CT2 + CT3) = 6;

[0069] Figure 19 Shows the lens surface profile change curve of the optical lens of an alternative embodiment of the present utility model;

[0070] Figure 20The stray light optical path diagram when the field of view angle is 0° is shown when the optical lens of another alternative embodiment of the present utility model satisfies (f1 + f2 + f3) / (d0s - d3s) = -3;

[0071] Figure 21 shows Figure 20 the stray light spot diagram of the optical lens in

[0072] Among them, the above-mentioned drawings include the following reference numerals:

[0073] P0, lens barrel; E1, first lens; S1, object side of the first lens; S2, image side of the first lens; E2, second lens; S3, object side of the second lens; S4, image side of the second lens; E3, third lens; S5, object side of the third lens; S6, image side of the third lens; E4, fourth lens; S7, object side of the fourth lens; S8, image side of the fourth lens; E5, fifth lens; S9, object side of the fifth lens; S10, image side of the fifth lens; E6, sixth lens; S11, object side of the sixth lens; S12, image side of the sixth lens; E7, seventh lens; S13, object side of the seventh lens; S14, image side of the seventh lens; E8, eighth lens; S15, object side of the eighth lens; S16, image side of the eighth lens; P2, second spacer; P3, third spacer; P4, fourth spacer; P5, fifth spacer; P6, sixth spacer; P7, seventh spacer. Detailed implementation manners

[0074] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0075] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0076] In the present utility model, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in the direction shown in the drawings, or in the vertical, perpendicular or gravitational direction of the component itself; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contour of each component itself, but the above orientation terms do not limit the present utility model.

[0077] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below can also be referred to as the second lens or the third lens.

[0078] In the drawings, for the sake of clarity, the thickness, dimensions, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are presented by way of example. That is, the spherical or aspherical shapes are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0079] In this document, 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 judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, using the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database in optical software) to judge the convexity and concavity by its positive or negative value. Taking the light-incident side as an example, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; taking the light-emitting side as an example, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0080] In order to solve the problems of poor assembly stability and serious stray light in the existing optical lenses when meeting the ultra-wide angle, the present utility model provides an optical lens.

[0081] As Figures 1 to 21 shown, in an alternative embodiment of the present application, the optical lens includes a lens barrel and eight lenses and a plurality of spacers disposed in the lens barrel. The lens barrel has a central through-hole centered on the optical axis. The eight lenses include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens in sequence along the optical axis from the object side to the image side. The plurality of spacers at least includes a third spacer, and the third spacer is located on the image side of the third lens and contacts the image side surface of the third lens. The maximum field of view FOV of the optical lens and the f-number Fno of the optical lens satisfy: 0.5 < tan(FOV / 4) / Fno < 1; the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: 1 < N1 / N2 < 1.5; the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d3s of the object side surface of the third spacer, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the central thickness CT3 of the third lens satisfy: 3.5 < (d0s - d3s) / (CT1 + CT2 + CT3) < 5.5.

[0082] The optical lens of the present application consists of a lens barrel and eight lenses and multiple spacers arranged in the lens barrel. By reasonably arranging the eight lenses and multiple spacers, and when the optical lens satisfies 0.5 < tan(FOV / 4) / Fno < 1 and 1 < N1 / N2 < 1.5, the optical lens has a larger field of view angle and a lower temperature drift. At the same time, because the refractive indices of the first lens and the second lens are different, the light path between the first lens and the second lens is relatively steep, resulting in a large step difference between the first lens and the second lens, thus affecting the assembly stability of the first three lenses. Therefore, in the present application, by restricting 3.5 < (d0s - d3s) / (CT1 + CT2 + CT3) < 5.5, by controlling the inner diameter of the object side of the lens barrel, the inner diameter of the object side of the third spacer, and the sum of the central thicknesses of the first lens to the third lens, while controlling the excess incident light and preventing it from entering the rear end to generate stray light, the change in the lens surface shape during the assembly process is small, which is beneficial to increasing the assembly stability and further improving the overall reliability of the optical lens.

[0083] In addition, the first lens of the optical lens is usually sucked by a plastic suction cup and then assembled into the lens barrel under a certain pressure. The applied pressure will affect the surface shape of all lenses. If the change in the lens surface shape is too large, it will affect the established light path between the lenses, resulting in poor imaging. The ANSYS software is used to simulate the change in the surface shape of the first five lenses at the front end during assembly. The force application diagram of the first lens is as Figure 17 shown. As Figures 18 to 19 shown, Figure 18 shows a schematic diagram of the axial deformation of the first lens to the fifth lens when the optical lens satisfies tan(FOV / 4) / Fno = 0.77, N1 / N2 = 1.22, and (d0s - d3s) / (CT1 + CT2 + CT3) = 3. Figure 18-1 shows a schematic diagram of the axial deformation of the first lens to the fifth lens when the optical lens satisfies tan(FOV / 4) / Fno = 0.77, N1 / N2 = 1.22, and (d0s - d3s) / (CT1 + CT2 + CT3) = 3.84. Figure 18-2 shows a schematic diagram of the axial deformation of the first lens to the fifth lens when the optical lens satisfies tan(FOV / 4) / Fno = 0.77, N1 / N2 = 1.22, and (d0s - d3s) / (CT1 + CT2 + CT3) = 6. By solving the displacements of the center points and edge points of the effective diameters on both sides of each lens surface, the change amount of the surface shape is obtained. Figure 19 shows Figure 18 , Figure 18-1 and Figure 18-2 of the lens surface shape change curves.

[0084] From Figure 19It can be seen that under different limiting value conditions, the object side surface of the second lens has the largest deformation amount among the surfaces of all lenses. When the constraints satisfy Figure 18 and Figure 18-2 , the surface shape change amount of the object side surface of the second lens exceeds 0.6 μm; while when the optical lens satisfies Figure 18-1 , compared with Figure 18 and Figure 18-2 , the surface shape change amounts of all lenses decrease significantly. In particular, for the object side surface of the second lens with the largest change amount, its surface shape change amount is 0.5 μm. Therefore, by constraining 0.5 < tan(FOV / 4) / Fno < 1, 1 < N1 / N2 < 1.5, and 3.5 < (d0s - d3s) / (CT1 + CT2 + CT3) < 5.5 in this application, the problems of poor assembly stability and poor reliability of the optical lens under the characteristics of a large field of view and low temperature drift can be improved.

[0085] In this embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 1 < f1 / f2 < 1.8; the plurality of spacers further includes a second spacer, the second spacer is located on the image side of the second lens and contacts the image side surface of the second lens. The axial distance EP02 from the object side surface of the lens barrel to the object side surface of the second spacer, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 0.5 < EP02 / (CT1 + CT2) < 2.5. By constraining the effective focal lengths of the first lens and the second lens, the overall structures of the first lens and the second lens can be constrained. However, there is a large step difference between the first lens and the second lens in the vertical axis direction. By constraining the inner diameter of the object side surface of the lens barrel and the central thicknesses of the first lens and the second lens, a suitable dispensing space can be ensured at the front end of the first lens, thereby improving the assembly stability at the front end position of the optical lens and retaining the design freedom of the central positions of the two lenses.

[0086] In this embodiment, the effective radius DT11 of the object side surface of the first lens, the inner diameter d0m of the image side surface of the lens barrel, the effective focal length f1 of the first lens, and the effective focal length f of the optical lens satisfy: -6 < f1 / f < -4 and 0.7 < DT11 / d0m < 2. Since there is a large difference in the sizes of the effective radius of the object side surface of the first lens and the inner diameter of the image side surface of the lens barrel, by controlling the effective radius of the object side surface of the first lens and the inner diameter of the image side surface of the lens barrel, it is beneficial to ensure a reasonable wall thickness of the lens barrel, meet the processability of the lens barrel, and avoid the inner diameter of the image side surface of the lens barrel being too small to block the light path and affect the imaging of the optical lens; by controlling the ratio of the effective focal length of the first lens to the effective focal length of the optical lens, it is beneficial to control the light path in the first lens, so that the light can enter the second lens more accurately.

[0087] In this embodiment, the on-axis distance TD from the object side surface of the first lens to the image side surface of the eighth lens is greater than the on-axis distance L from the object side surface to the image side surface of the lens barrel. The on-axis distance from the object side surface of the first lens to the image side surface of the eighth lens is greater than the on-axis distance from the object side surface to the image side surface of the optical lens. The overall size of the lens group is slightly larger than that of the lens barrel. The first lens protrudes towards the object side, and there will be certain difficulties in the production and processing of the first lens. The following relationship is satisfied among the on-axis distance TD from the object side surface of the first lens to the image side surface of the eighth lens, the on-axis distance L from the object side surface to the image side surface of the lens barrel, the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens: -0.1 < (TD - L - CT1) / (R1 - R2) < 0.2. By controlling the central thickness of the first lens, the curvature radius of the object side surface of the first lens, and the curvature radius of the image side surface of the first lens, the overall shape of the first lens can be ensured to be uniform, which is more conducive to improving the lens processing performance of the first lens.

[0088] In this embodiment, the first lens is a glass lens. The following relationship is satisfied between the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the central thickness CT1 of the first lens: 1 < T12 / CT1 < 3.5. By controlling the ratio of the axial distance from the image side surface of the first lens to the object side surface of the second lens to the central thickness of the first lens, the first lens can have a certain length of straight-up position, ensuring the core-taking processability of the lens and being conducive to improving the system coaxiality of the entire optical lens. However, there is still a certain risk of poor uniformity in the processing of the lens barrel. The following relationship is satisfied between the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the outer diameter D0s of the object side surface of the lens barrel: 5 < D0s / T12 < 7. By restricting this conditional formula and controlling the ratio of the outer diameter of the object side surface of the lens barrel to the on-axis distance from the image side surface of the first lens to the object side surface of the second lens, the overall shape of the optical lens can be restricted. On the premise of a certain optical aperture, the uniformity of the lens barrel can be ensured to be good, thereby ensuring the processability of the lens barrel.

[0089] In this embodiment, the plurality of spacers further includes a fifth spacer. The fifth spacer is located on the image side of the fifth lens and is in contact with the image side surface of the fifth lens. The fifth spacer is integrally formed with the lens barrel. Both the object side surface and the image side surface of the fifth spacer are perpendicular to the optical axis. The following relationship is satisfied between the on-axis distance CP5 from the object side surface to the image side surface of the fifth spacer and the on-axis distance T56 from the image side surface of the fifth lens to the object side surface of the sixth lens: 6 < CP5 / T56 < 9. By controlling the thickness of the fifth spacer and the wall thickness of the lens barrel, it can help the lens barrel and the fifth spacer to be better formed; at the same time, ensuring an appropriate thickness ratio between the fifth lens and the sixth lens is more conducive to the formation of the fifth lens and the sixth lens.

[0090] In this embodiment, the following relationships are satisfied among the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the radius of curvature R10 of the image side surface of the fifth lens, and the radius of curvature R11 of the object side surface of the sixth lens: 0.9 < (f5 - f6) / (R10 + R11) < 1; the following relationships are satisfied among the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d5s of the object side surface of the fifth spacer, the inner diameter d0m of the image side surface of the lens barrel, and the inner diameter d5m of the image side surface of the fifth spacer: 2 < (d0s - d5s) / (d0m - d5m) < 10. By controlling the effective focal lengths of the fifth lens and the sixth lens, the radius of curvature of the image side surface of the fifth lens, and the radius of curvature of the object side surface of the sixth lens, the overall shape of the fifth lens and the sixth lens can be ensured to be uniform, which is beneficial to the molding and processing of the fifth lens and the sixth lens. However, since the radius of curvature of the image side surface of the fifth lens and the radius of curvature of the object side surface of the sixth lens are both small, the distance from the bearing position of the image side surface of the fifth lens to the bearing position of the object side surface of the sixth lens is large, and the optical path is long. Therefore, stray light is likely to be generated, affecting imaging. By controlling the inner diameters of the object side surface and the image side surface of the fifth spacer, stray light can be intercepted near the image side surface of the fifth lens, so that the light exits along the edge of the fifth spacer, effectively avoiding stray light; by controlling the inner diameters of the object side surface and the image side surface of the lens barrel, the outer diameters of the first lens and the eighth lens can be restricted, and on the premise that the light can pass through the optical lens completely and be imaged, the dimensions of the front and rear end faces of the lens barrel can be controlled, which is more beneficial to the cooperation of the optical lens at the module end.

[0091] In this embodiment, the effective focal lengths f4 of the fourth lens, f5 of the fifth lens, and f6 of the sixth lens satisfy: 2 < (f4 + f5 + f6) / f5 < 3; the plurality of spacers further include a second spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer. The second spacer is located on the image side of the second lens and is in contact with the image side surface of the second lens. The fourth spacer is located on the image side of the fourth lens and is in contact with the image side surface of the fourth lens. The sixth spacer is located on the image side of the sixth lens and is in contact with the image side surface of the sixth lens. The seventh spacer is located on the image side of the seventh lens and is in contact with the image side surface of the seventh lens, satisfying: 0.3 < CP5 / ∑CPi < 1, where i = 2, 3, 4, 5, 6, 7. Here, CP5 is the maximum axial thickness of the fifth spacer, and ∑CPi is the sum of the maximum axial thicknesses of the second spacer, the third spacer, the fourth spacer, the fifth spacer, the sixth spacer, and the seventh spacer. By controlling the effective focal lengths of the fourth lens, the fifth lens, and the sixth lens, the central structures of the fourth, fifth, and sixth lenses can be constrained, making the paraxial light rays and imaging effects better. However, the problem of light convergence generated by the edges of each lens is ignored, affecting the light exit angle and relative illumination; by controlling the maximum axial thicknesses of the second spacer, the third spacer, the fourth spacer, the fifth spacer, the sixth spacer, and the seventh spacer, the edges of the lenses can be indirectly constrained, thereby avoiding the problem of light convergence generated by the edges of the lenses from affecting the optical principal value.

[0092] In this embodiment, the maximum axial thickness CP5 of the fifth spacer, the displacement SAG52 on the axis from the intersection of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens, the axial distance T56 on the axis from the image side surface of the fifth lens to the object side surface of the sixth lens, and the displacement SAG61 on the axis from the intersection of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens satisfy: 30 < CP5 / (SAG52 + T56 + SAG61) < 150. Since the fifth spacer is integrally formed with the lens barrel, by constraining this conditional expression, on the one hand, the thickness of the fifth spacer can be controlled to ensure that the thickness of the fifth spacer is uniform with the wall thickness of the lens barrel, which is beneficial to the molding of the lens barrel; on the other hand, since the image side surface of the fifth lens and the object side surface of the sixth spacer both rest on the fifth spacer, the edge thicknesses of the fifth lens and the sixth lens can be indirectly ensured, which is more beneficial to the processing and molding of the lenses.

[0093] In this embodiment, the following conditions are satisfied between the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens: (|f6| - |f7|) / |f6| < 0.1; the following conditions are satisfied between the inner diameter d6s of the object side surface of the sixth spacer, the outer diameter D6s of the object side surface of the sixth spacer, the central thickness CT6 of the sixth lens and the central thickness CT7 of the seventh lens: 3 < (d6s + D6s) / (CT6 + CT7) < 5. On the premise that the optical power of the sixth lens is positive and the optical power of the seventh lens is negative, by controlling the numerical values of the effective focal lengths of the sixth lens and the seventh lens, the positive and negative spherical aberrations generated by the sixth lens and the seventh lens can be balanced with each other to ensure good imaging quality. However, this will bring difficulties to the molding of the lens. Therefore, by controlling the inner diameter and outer diameter of the object side surface of the sixth spacer and the central thicknesses of the sixth lens and the seventh lens, while ensuring the imaging quality of the sixth lens and the seventh lens, an appropriate thickness ratio is ensured, which is more conducive to the processing and molding of the sixth lens and the seventh lens.

[0094] In this embodiment, the following conditions are satisfied between the combined focal length f67 of the sixth lens and the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer and the inner diameter d6m of the image side surface of the sixth spacer: 9 < f67 / (D6m - d6m) < 17. By controlling the combined focal length of the sixth lens and the seventh lens, it is beneficial to control the propagation path of light in the sixth lens and the seventh lens, thereby reducing the sensitivity of the sixth lens and the seventh lens. At the same time, it can block excess light and avoid stray light, thereby improving the imaging quality of the optical lens.

[0095] In this embodiment, the following conditions are satisfied between the outer diameter D0s of the object side surface of the lens barrel, the outer diameter D0m of the image side surface of the lens barrel and the effective focal length f of the optical lens: 2 < (D0s - D0m) / f < 13; the following conditions are satisfied between the Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens and the Abbe number V7 of the seventh lens: V6 > V5 + V7. When satisfying the ultra-wide angle, it is necessary to control the Abbe number of the sixth lens to be greater than the sum of the Abbe numbers of the fifth lens and the seventh lens. Selecting a glass lens for the sixth lens is beneficial to eliminating the temperature drift effect, and thus the optical lens can clearly image within a large temperature range; selecting plastic lenses for the fifth lens and the seventh lens can save costs; and under the current optical lens framework, the material selection of the fifth lens, the sixth lens and the seventh lens will affect the propagation path of light in the optical lens, resulting in a shape where the openings at both ends of the lens barrel are large and the opening in the middle is small, and thus increasing the molding difficulty of the lens barrel. Therefore, by controlling the outer diameters of the object side surface and the image side surface of the lens barrel and the focal length of the optical lens, on the premise of meeting the appearance requirements, ensuring that the outer diameters of the object side surface and the image side surface of the lens barrel are as close as possible is more conducive to the molding of the lens barrel.

[0096] In this embodiment, the sixth lens is a glass lens, and the following conditions are satisfied between the radius of curvature R12 of the image side surface of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens: 5 < (R12 - R11) / (R12 + R11) < 6; the following condition is satisfied between the central thickness CT6 of the sixth lens and the on-axis distance EP56 from the image side surface of the fifth spacer to the object side surface of the sixth spacer: 2 < CT6 / EP56 < 3. By constraining the radius of curvature of the object side surface and the image side surface of the sixth lens, the central thickness of the sixth lens, and the axial distance from the image side surface of the fifth spacer to the object side surface of the sixth spacer, it is beneficial to ensure the overall shape of the sixth lens, make the optical path of light in the lens more accurate, and ensure the edge thickness of the sixth lens, which is more conducive to the processing of the sixth lens.

[0097] In this embodiment, the following condition is satisfied between the displacement SAG62 on the axis from the intersection point of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens and the displacement SAG81 on the axis from the intersection point of the object side surface of the eighth lens and the optical axis to the vertex of the effective radius of the object side surface of the eighth lens: -1 < SAG62 / SAG81 < -0.5; the following condition is satisfied between the Abbe number V7 of the seventh lens and the Abbe number V8 of the eighth lens: V8 > 2 * V7; the following condition is satisfied between the inner diameter d7s of the object side surface of the seventh spacer and the inner diameter d6m of the image side surface of the sixth spacer: 1 < d7s / d6m < 1.5. By constraining the edge thicknesses of the sixth lens and the eighth lens, while ensuring the assembly stability of the optical lens and the imaging quality of the optical lens, the processability of the sixth lens and the eighth lens is improved, and it is ensured that the light emitted from the sixth lens and the seventh lens can closely adhere to the spacer, so that it is possible to avoid the influence on the relative illumination due to too small an inner diameter of the spacer, and it is also possible to avoid the generation of stray light caused by too large an inner diameter of the spacer resulting in excessive light passing through the central light-transmitting area of the lens.

[0098] In this embodiment, the following condition is satisfied between the inner diameter d0m of the image side surface of the lens barrel and the outer diameter D6s of the object side surface of the sixth spacer: 1 < d0m / D6s < 1.5. Since the sixth lens is the first lens assembled from the rear end of the lens barrel, by controlling the inner diameter of the image side surface of the lens barrel and the outer diameter of the object side surface of the sixth spacer, it is possible to control the uniform wall thickness of the entire lens barrel while ensuring the compactness of the outer diameter size at the rear end of the lens barrel, thereby improving the processability of the lens barrel.

[0099] In this embodiment, the following relationship is satisfied among the maximum axial thickness CP6 of the sixth spacer, the on-axis distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh lens, the maximum axial thickness CP7 of the seventh spacer, the displacement SAG62 on the axis from the intersection point of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens, and the displacement SAG81 on the axis from the intersection point of the object side surface of the eighth lens and the optical axis to the vertex of the effective radius of the object side surface of the eighth lens: 2 < (CP6 + EP67 + CP7) / (SAG62 + SAG81) < 16. By constraining this conditional expression, the edge thicknesses of the sixth lens, the seventh lens, and the eighth lens, as well as the maximum axial thickness of the seventh spacer, are reasonably allocated. On the premise of ensuring the assembly stability of the optical lens, the processability of the sixth lens, the seventh lens, the eighth lens, and the seventh spacer is improved.

[0100] In this embodiment, the plurality of spacers further includes a seventh auxiliary spacer. The seventh auxiliary spacer is located on the image side of the seventh spacer and in contact with the seventh spacer. The following relationship is satisfied among the maximum axial thickness CP6 of the sixth spacer, the on-axis distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh lens, the maximum axial thickness CP7 of the seventh spacer, the maximum axial thickness CP7b of the seventh auxiliary spacer, the displacement SAG62 on the axis from the intersection point of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens, and the displacement SAG81 on the axis from the intersection point of the object side surface of the eighth lens and the optical axis to the vertex of the effective radius of the object side surface of the eighth lens: 5 < (CP6 + EP67 + CP7 + CP7b) / (SAG62 + SAG81) < 20. By providing the seventh auxiliary spacer, stray light can be effectively avoided. The inner diameter of the seventh auxiliary spacer is controlled at the edge of the theoretical light path, which can prevent excessive light from being reflected on the inner diameter of the seventh spacer or the mechanical part of the eighth lens to generate stray light.

[0101] In this embodiment, the maximum effective radii of the first lens to the fourth lens decrease one by one. Among the multiple spacers, the inner diameter value of the object side surface of the fourth spacer is the smallest. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, and the effective focal length f4 of the fourth lens satisfy: 2 < |f1 + f2| / |f3 + f4| < 15; the inner diameter d2s of the object side surface of the second spacer, the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d4s of the object side surface of the fourth spacer, and the inner diameter d2m of the image side surface of the second spacer satisfy: 5 < (d2s - d0s) / (d4s - d2m) < 10. By controlling the effective focal lengths of the first lens, the second lens, the third lens, and the fourth lens, the deflection angles of the marginal field of view in the first lens to the fourth lens can be effectively controlled, thereby effectively reducing the sensitivity of the optical system. However, at the same time, certain stray light will be generated in the marginal field of view, which will affect the imaging effect. By controlling the front aperture of the lens barrel, the inner diameters of the object side surface and the image side surface of the second spacer, and the inner diameter of the object side surface of the fourth spacer, the stray light generated by the excess light incident on the mechanical parts of the lens at the edges of the first four lenses can be weakened on the premise of ensuring the relative illuminance of the marginal field of view.

[0102] In this embodiment, the on-axis distance EP34 from the image side surface of the third spacer to the object side surface of the fourth spacer, the on-axis distance EP45 from the image side surface of the fourth spacer to the object side surface of the fifth spacer, the central thickness CT4 of the fourth lens, and the central thickness CT5 of the fifth lens satisfy: 0.8 < (EP34 / EP45) / (CT4 / CT5) < 2. By constraining this conditional formula, on the premise of ensuring the assembly stability of the optical lens, a suitable thickness ratio of the fourth lens and the fifth lens can be ensured, which is more conducive to the processing and forming of the fourth lens and the fifth lens.

[0103] In this embodiment, the on-axis distance EP23 from the image side surface of the second spacer to the object side surface of the third spacer and the central thickness CT3 of the third lens satisfy: 1 < EP23 / CT3 < 1.6. By constraining this conditional formula, on the premise of ensuring the assembly stability of the third lens in the optical lens, a suitable thickness ratio can be obtained, which is more conducive to the processing and forming of the third lens.

[0104] As Figures 1 to 21As shown, in another optional embodiment of the present application, the optical lens comprises a lens barrel and eight lenses and a plurality of spacers arranged in the lens barrel, the lens barrel having a central through hole, and the central through hole is arranged with the optical axis as the central axis; the eight lenses include, in order from the object side to the image side of the optical axis, a first lens with negative optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power and an eighth lens with positive optical power; the plurality of spacers include at least a third spacer, the third spacer is located on the image side of the third lens and contacts the image side surface of the third lens; the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy the following relationship: <N1 / N2<1.5;第一透镜的有效焦距f1、第二透镜的有效焦距f2、第三透镜的有效焦距f3、镜筒的物侧面的内径d0s与第三间隔件的物侧面的内径d3s之间满足:-2<(f1+f2+f3) / (d0s-d3s)<-0.5。

[0105] The optical lens of the present application is composed of a lens barrel and eight lenses and a plurality of spacers arranged in the lens barrel. By rationally configuring the focal power of each lens and the ratio of the refractive index of the first lens to the second lens, the optical lens has low temperature drift and large viewing angle characteristics, but the light between the first lens and the third lens is steep, thereby causing the optical lens front end light reflection to produce stray light. Therefore, the present application constrains the effective focal length of the first, second, and third lenses, the object side of the lens barrel, and the inner diameter of the object side of the third spacer by constraint-2<(f1+f2+f3) / (d0s-d3s)<-0.5, which is conducive to controlling the trend of light in the first, second, and third lenses, can reduce the sensitivity of the first, second, and third lenses, and also controls the effective aperture of the first lens simultaneously, so that effective light can enter the optical lens completely for imaging, and avoids the stray light generated to cause poor imaging.

[0106] In addition, ASAP software is used to simulate the stray light of the optical lens. Figure 20 The figure shows the stray light path diagram at a field angle of 0° when the optical lens satisfies (f1+f2+f3) / (d0s-d3s)=-3. It can be seen from the figure that due to insufficient shielding by the third spacer, the light enters the fourth lens and reaches the chip after multiple folds inside the fourth lens. The schematic diagram of the corresponding stray light spot is as follows: Figure 21 As shown in the figure, it is displayed as annular stray light with a high energy value. When the optical lens satisfies (f1+f2+f3) / (d0s-d3s)=-1.89, the third spacer Figure 20The optical path shown is blocked, and the corresponding optical path cannot be simulated, indicating that the corresponding stray light is not generated. When the optical lens satisfies (f1 + f2 + f3) / (d0s - d3s) = 1, the third spacer blocks the effective imaging light, and no stray light will be generated at this time, but it will affect the optical principal value of the optical lens, causing defects such as RI and CRA. Therefore, in this application, by restricting -2 < (f1 + f2 + f3) / (d0s - d3s) < -0.5, while ensuring that the third spacer can effectively block stray light and ensuring the imaging quality, it is ensured that the third spacer does not block the imaging light and the light transmission efficiency is guaranteed.

[0107] Of course, other parametric formulas in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0108] In addition, in another alternative embodiment of the present application, the optical lens includes a lens barrel and eight lenses and multiple spacers disposed in the lens barrel. The lens barrel has a central through hole centered on the optical axis; the eight lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens along the optical axis from the object side to the image side; the multiple spacers at least include a sixth spacer, the sixth spacer is located on the image side of the sixth lens and is in contact with the image side surface of the sixth lens, and the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: (|f6| - |f7|) / |f6| < 0.1; the inner diameter d6s of the object side surface of the sixth spacer, the outer diameter D6s of the object side surface of the sixth spacer, the central thickness CT6 of the sixth lens, and the central thickness CT7 of the seventh lens satisfy: 3 < (d6s + D6s) / (CT6 + CT7) < 5.

[0109] The optical lens of the present application is composed of a lens barrel and eight lenses and multiple spacers disposed in the lens barrel. On the premise that the optical power of the sixth lens is positive and the optical power of the seventh lens is negative, by controlling the effective focal lengths of the sixth lens and the seventh lens, the positive and negative spherical aberrations generated by the sixth lens and the seventh lens can be balanced with each other to ensure good imaging quality. However, it will also bring difficulties to the molding of the lens. Therefore, by controlling the inner diameter and outer diameter of the object side surface of the sixth spacer and the central thicknesses of the sixth lens and the seventh lens, while ensuring the imaging quality of the sixth lens and the seventh lens, an appropriate thickness ratio is ensured, which is more conducive to the processing and molding of the sixth lens and the seventh lens.

[0110] Of course, other parametric formulas in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0111] In addition, in another alternative embodiment of the present application, the optical lens includes a lens barrel and eight lenses and a plurality of spacers disposed in the lens barrel. The lens barrel has a central through hole which is arranged with the optical axis as the central axis; the eight lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens along the optical axis from the object side to the image side; the outer diameter D0s of the object side surface of the lens barrel, the outer diameter D0m of the image side surface of the lens barrel and the effective focal length f of the optical lens satisfy: 2 < (D0s - D0m) / f < 13; the Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens and the Abbe number V7 of the seventh lens satisfy: V6 > V5 + V7.

[0112] The optical lens of the present application is composed of a lens barrel and eight lenses and a plurality of spacers disposed in the lens barrel. By controlling that the Abbe number of the sixth lens is greater than the sum of the Abbe numbers of the fifth lens and the seventh lens, and the sixth lens is made of a glass lens, it is beneficial to eliminate the temperature drift effect, and thus the optical lens can clearly image within a large temperature range; the fifth lens and the seventh lens are made of plastic lenses, which can save costs; and under the current optical lens framework, the material selection of the fifth lens, the sixth lens and the seventh lens will affect the passing path of light in the optical lens, resulting in a shape of the lens barrel with a large opening at both ends and a small opening in the middle, and further increasing the forming difficulty of the lens barrel. Therefore, by controlling the outer diameters of the object side surface and the image side surface of the lens barrel and the focal length of the optical lens, on the premise of meeting the appearance, ensuring that the outer diameters of the object side surface and the image side surface of the lens barrel are as close as possible is more beneficial to the forming of the lens barrel.

[0113] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0114] Optionally, the above optical lens may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0115] The optical lens in the present application may adopt multiple lenses, such as the eight lenses mentioned above. In the present application, at least one of the lens surfaces of each lens is an aspherical 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 improving astigmatism aberration. After adopting an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0116] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although the example of eight lenses is described in the embodiments, the optical lens is not limited to including eight lenses. If necessary, the optical lens may also include other numbers of lenses.

[0117] Figure 1 The structural schematic diagram of an optical lens of this application is shown, where Figure 1 parameters such as CP2, CP3, CP4, CP5, CP6, CP7, EP02, EP23, EP34, EP45, EP56, D0s, d0s, d2s, d2m, d3s, d4s, d5s, d5m, d6s, d6m, D6s, D6m, d7s, d0m, D0m, L are marked to clearly and intuitively understand the meaning of the parameters. For the convenience of the optical lens and the specific surface shape, these parameters will no longer be shown in the drawings when subsequent specific embodiments are described.

[0118] The following further describes, with reference to the drawings, examples of the specific surface shape and parameters of the optical lens applicable to the above embodiments.

[0119] It should be noted that in the following embodiments, there are a first state, a second state, and a third state. In the same embodiment, the curvature radii, central thicknesses, and other parameters of the first lens to the eighth lens of the optical lens, as well as the spacing distances and higher-order term coefficients between the lenses, are the same, but the parameters of the lens barrel, the thicknesses, inner diameters, and outer diameters of the first spacer to the seventh spacer, and the shapes of the lenses are different. Or rather, the main structures for imaging are the same, while the auxiliary structures for imaging are different.

[0120] It should be noted that any one of the following Embodiment 1 to Embodiment 3 is applicable to all embodiments of this application.

[0121] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0122] Embodiment 1

[0123] As Figures 2 to 6 shown, the optical lens of Embodiment 1 is described. Figure 2 The structural schematic diagram of the optical lens of Embodiment 1 under Embodiment 1-1 is shown, Figure 3 The structural schematic diagram of the optical lens of Embodiment 1 under Embodiment 1-2 is shown, Figure 4 The structural schematic diagram of the optical lens of Embodiment 1 under Embodiment 1-3 is shown.

[0124] As shown Figures 2 to 4 in the figure, the optical lens includes a lens barrel P0 and the following components sequentially arranged in the lens barrel P0 along the optical axis of the lens barrel P0 from the object side to the image side: a first lens E1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8.

[0125] As shown Figure 2 in the figure, in Embodiment 1-1 of the optical lens, the object side surface and the image side surface of the second spacer P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens. The object side surface and the image side surface of the fifth spacer P5 are respectively in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens. The object side surface and the image side surface of the sixth spacer P6 are respectively in contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens. The object side surface and the image side surface of the seventh spacer P7 are respectively in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens.

[0126] As shown Figure 3 in the figure, in Embodiment 1-2 of the optical lens, the plurality of spacers further includes a seventh auxiliary spacer P7b. The seventh auxiliary spacer P7b is located on the image side of the seventh spacer P7 and is in contact with the image side surface of the seventh spacer P7. The image side surface of the seventh auxiliary spacer P7b is in contact with the object side surface S15 of the eighth lens. The abutting manner of the remaining spacers is the same as that in Embodiment 1-1, and reference can be made to the relevant description in Embodiment 1-1, which will not be elaborated here.

[0127] As shown Figure 4 in the figure, in Embodiment 1-3 of the optical lens, the plurality of spacers further includes a seventh auxiliary spacer P7b and a seventh auxiliary spacer P7c. The seventh auxiliary spacer P7b is located on the image side of the seventh spacer P7 and is in contact with the image side surface of the seventh spacer P7. The seventh auxiliary spacer P7c is located on the image side of the seventh auxiliary spacer P7b and is in contact with the image side surface of the seventh auxiliary spacer P7b. The image side surface of the seventh auxiliary spacer P7c is in contact with the object side surface S15 of the eighth lens. The abutting manner of the remaining spacers is the same as that in Embodiment 1-1, and reference can be made to the relevant description in Embodiment 1-1, which will not be elaborated here.

[0128] In summary, the structural parameters of the optical lens in the first embodiment are shown in Table 1 of Embodiments 1-1, 1-2, and 1-3. (Unit: mm)

[0129]

[0130]

[0131] Table 1

[0132] In the first embodiment, the object side S1 of the first lens is a convex surface, and the image side S2 of the first lens is a concave surface. The object side S3 of the second lens is a concave surface, and the image side S4 of the second lens is a concave surface. The object side S5 of the third lens is a convex surface, and the image side S6 of the third lens is a concave surface. The object side S7 of the fourth lens is a convex surface, and the image side S8 of the fourth lens is a concave surface. The object side S9 of the fifth lens is a concave surface, and the image side S10 of the fifth lens is a convex surface. The object side S11 of the sixth lens is a convex surface, and the image side S12 of the sixth lens is a convex surface. The object side S13 of the seventh lens is a concave surface, and the image side S14 of the seventh lens is a convex surface. The object side S15 of the eighth lens is a convex surface, and the image side S16 of the eighth lens is a concave surface.

[0133] Table 2 shows the basic structural parameter table of the optical lens in the first embodiment, where the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0134]

[0135]

[0136] Table 2

[0137] In the first embodiment, the object side and the image side of the second lens to the eighth lens are both aspherical surfaces, and the surface profiles of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0138]

[0139] where x is the sagitta, the distance from the vertex of the aspherical surface to the position along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 2 above; k is the conic constant; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 3 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical surfaces S3 - S16 in the first embodiment.

[0140]

[0141] Table 3

[0142] Figure 5 Shows the axial chromatic aberration curve of the optical lens of the first embodiment, which represents the deviation of the focus points of light rays with different wavelengths after passing through the optical lens. Figure 6 Shows the astigmatism curve of the optical lens of the first embodiment, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane.

[0143] According to Figures 5 to 6 It can be seen that the optical lens given in the first embodiment can achieve good imaging quality.

[0144] The second embodiment

[0145] Such as Figures 7 to 11 Shown, describes the optical lens of the second embodiment. Figure 7 Shows the schematic structural diagram of the optical lens of the second embodiment under Example 2-1, Figure 8 Shows the schematic structural diagram of the optical lens of the second embodiment under Example 2-2, Figure 9 Shows the schematic structural diagram of the optical lens of the second embodiment under Example 2-3.

[0146] Such as Figures 7 to 9 Shown, the optical lens includes a lens barrel P0 and, arranged in the lens barrel P0 along the optical axis of the lens barrel P0 from the object side to the image side in sequence: a first lens E1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, an eighth lens E8.

[0147] Such as Figure 7 Shown, in the second embodiment of the optical lens, the object side surface and the image side surface of the second spacer P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens. The object side surface and the image side surface of the fifth spacer P5 are respectively in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens. The object side surface and the image side surface of the sixth spacer P6 are respectively in contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens. The object side surface and the image side surface of the seventh spacer P7 are respectively in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens.

[0148] Such as Figure 8As shown, in Embodiment 2-2 of the optical lens, the plurality of spacers further includes a seventh auxiliary spacer P7b. The seventh auxiliary spacer P7b is located on the image side of the seventh spacer P7 and contacts the image side surface of the seventh spacer P7. The image side surface of the seventh auxiliary spacer P7b abuts against the object side surface S15 of the eighth lens. The abutting manner of the remaining spacers is the same as that in Embodiment 2-1, and reference can be made to the relevant description in Embodiment 2-1, which will not be elaborated here.

[0149] As Figure 9 shown, in Embodiment 2-3 of the optical lens, the abutting and contacting manner of each spacer is the same as that in Embodiment 2-2, and reference can be made to the relevant description in Embodiment 2-2, which will not be elaborated here.

[0150] In summary, the structural parameters of the optical lens in Embodiment 2 are shown in Table 4 for Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3. (Unit: mm)

[0151]

[0152]

[0153] Table 4

[0154] In Embodiment 2, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is concave. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is convex. The object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The object side surface S15 of the eighth lens is convex, and the image side surface S16 of the eighth lens is concave.

[0155] Table 5 shows the basic structural parameter table of the optical lens in Embodiment 2, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0156]

[0157] Table 5

[0158] The following Table 6 gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirror surfaces S3 - S16 in Embodiment 2.

[0159]

[0160]

[0161] Table 6

[0162] Figure 10 Figure 8 shows the axial chromatic aberration curve of the optical lens in Embodiment 2, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical lens. Figure 11 Figure 10 shows the astigmatism curve of the optical lens in Embodiment 2, which represents the meridional image plane curvature and the sagittal image plane curvature.

[0163] According to Figures 10 to 11 it can be known that the optical lens given in Embodiment 2 can achieve good imaging quality.

[0164] Embodiment 3

[0165] As Figures 12 to 16 shown, the optical lens in Embodiment 3 is described. Figure 12 Figure 25 shows the schematic structural diagram of the optical lens in Embodiment 3 under Embodiment 3-1, Figure 13 Figure 27 shows the schematic structural diagram of the optical lens in Embodiment 3 under Embodiment 3-2, Figure 14 Figure 29 shows the schematic structural diagram of the optical lens in Embodiment 3 under Embodiment 3-3.

[0166] As Figures 12 to 14 shown, the optical lens includes a lens barrel P0 and, arranged in the lens barrel P0 along the optical axis of the lens barrel P0 from the object side to the image side in sequence: a first lens E1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fifth lens E5, a fifth spacer P5, a sixth lens E6, a sixth spacer P6, a seventh lens E7, a seventh spacer P7, and an eighth lens E8.

[0167] As Figure 12 shown, in the optical lens under Embodiment 3-1, the object side surface and the image side surface of the second spacer P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens. The object side surface and the image side surface of the fifth spacer P5 are respectively in contact with the image side surface S10 of the fifth lens and the object side surface S11 of the sixth lens. The object side surface and the image side surface of the sixth spacer P6 are respectively in contact with the image side surface S12 of the sixth lens and the object side surface S13 of the seventh lens. The object side surface and the image side surface of the seventh spacer P7 are respectively in contact with the image side surface S14 of the seventh lens and the object side surface S15 of the eighth lens.

[0168] As Figure 13As shown, in Embodiment 3-2 of the optical lens, the plurality of spacers further includes a seventh auxiliary spacer P7b. The seventh auxiliary spacer P7b is located on the image side of the seventh spacer P7 and contacts the image side surface of the seventh spacer P7. The image side surface of the seventh auxiliary spacer P7b abuts against the object side surface S15 of the eighth lens. The abutting manner of the remaining spacers is the same as that in Embodiment 3-1, and reference can be made to the relevant description in Embodiment 3-1, which will not be elaborated here.

[0169] As Figure 14 shown, in Embodiment 3-3 of the optical lens, the abutting and contacting manner of each spacer is the same as that in Embodiment 3-2, and reference can be made to the relevant description in Embodiment 3-2, which will not be elaborated here.

[0170] In summary, the structural parameters of the optical lens in Embodiment Three are shown in Table 7 for Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3. (Unit: mm)

[0171]

[0172]

[0173] Table 7

[0174] In Embodiment Three, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is concave. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is convex. The object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is convex. The object side surface S15 of the eighth lens is convex, and the image side surface S16 of the eighth lens is concave.

[0175] Table 8 shows the basic structural parameter table of the optical lens in Embodiment Three, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0176]

[0177]

[0178] Table 8

[0179] The following Table 9 gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror surface S3 - S16 in Embodiment Three.

[0180]

[0181]

[0182] Table 9

[0183] Figure 15 shows the axial chromatic aberration curve of the optical lens of Embodiment 3, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the optical lens. Figure 16 shows the astigmatism curve of the optical lens of Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature.

[0184] According to Figures 15 to 16 it can be known that the optical lens given in Embodiment 3 can achieve good imaging quality.

[0185] In summary, Embodiments 1 to 3 respectively satisfy the relationships shown in Table 10.

[0186]

[0187]

[0188] Table 10

[0189] This application also provides an imaging device, and its electronic photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) element. The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens described above.

[0190] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0191] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0192] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0193] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An optical lens, characterized in that: It includes a lens barrel and eight lenses and multiple spacers arranged in the lens barrel. The lens barrel has a central through-hole which is arranged with the optical axis as the central axis; the eight lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens along the optical axis from the object side to the image side. The multiple spacers at least include a third spacer which is located on the image side of the third lens and in contact with the image side surface of the third lens. For the optical lens, the maximum field of view angle FOV and the aperture coefficient Fno of the optical lens satisfy: 0.5 < tan(FOV / 4) / Fno < 1. Between the refractive index N1 of the first lens and the refractive index N2 of the second lens, it satisfies: 1 < N1 / N2 < 1.

5. Between the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d3s of the object side surface of the third spacer, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens, it satisfies: 3.5 < (d0s - d3s) / (CT1 + CT2 + CT3) < 5.

5.

2. The optical lens according to claim 1, wherein Between the effective focal length f1 of the first lens and the effective focal length f2 of the second lens, it satisfies: 1 < f1 / f2 < 1.8; and The multiple spacers further include a second spacer which is located on the image side of the second lens and in contact with the image side surface of the second lens. Between the axial distance EP02 from the object side surface of the lens barrel to the object side surface of the second spacer, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens, it satisfies: 0.5 < EP02 / (CT1 + CT2) < 2.

5.

3. The optical lens according to claim 1, characterized in that: Between the effective radius DT11 of the object side surface of the first lens, the inner diameter d0m of the image side surface of the lens barrel, the effective focal length f1 of the first lens and the effective focal length f of the optical lens, it satisfies: -6 < f1 / f < -4 and 0.7 < DT11 / d0m < 2.

4. The optical lens according to claim 1, wherein The on-axis distance TD from the object side surface of the first lens to the image side surface of the eighth lens is greater than the on-axis distance L from the object side surface to the image side surface of the lens barrel. Between the on-axis distance TD from the object side surface of the first lens to the image side surface of the eighth lens, the on-axis distance L from the object side surface to the image side surface of the lens barrel, the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens, it satisfies: -0.1 < (TD - L - CT1) / (R1 - R2) < 0.

2.

5. The optical lens according to claim 1, characterized in that: The first lens is a glass lens. Between the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the central thickness CT1 of the first lens, it satisfies: 1 < T12 / CT1 < 3.5; and The axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the outer diameter D0s of the object side surface of the lens barrel satisfy: 5 < D0s / T12 < 7.

6. The optical lens according to claim 1, characterized in that: The plurality of spacers further includes a fifth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, and the on-axis distance CP5 from the object side surface to the image side surface of the fifth spacer and the on-axis distance T56 from the image side surface of the fifth lens to the object side surface of the sixth lens satisfy: 6 < CP5 / T56 < 9.

7. The optical lens according to claim 1, wherein The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the radius of curvature R10 of the image side surface of the fifth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: 0.9 < (f5 - f6) / (R10 + R11) < 1; and The plurality of spacers further includes a fifth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, and the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d5s of the object side surface of the fifth spacer, the inner diameter d0m of the image side surface of the lens barrel and the inner diameter d5m of the image side surface of the fifth spacer satisfy: 2 < (d0s - d5s) / (d0m - d5m) < 10.

8. The optical lens according to claim 1, wherein The effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens satisfy: 2 < (f4 + f5 + f6) / f5 < 3; and The plurality of spacers further includes a second spacer, a fourth spacer, a fifth spacer, a sixth spacer and a seventh spacer. The second spacer is located on the image side of the second lens and contacts the image side surface of the second lens. The fourth spacer is located on the image side of the fourth lens and contacts the image side surface of the fourth lens. The fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens. The sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens. The seventh spacer is located on the image side of the seventh lens and contacts the image side surface of the seventh lens, satisfying: 0.3 < CP5 / ∑CPi < 1, i = 2, 3, 4, 5, 6, 7, where CP5 is the maximum axial thickness of the fifth spacer, and ∑CPi is the sum of the maximum axial thicknesses of the second spacer, the third spacer, the fourth spacer, the fifth spacer, the sixth spacer and the seventh spacer.

9. The optical lens according to claim 1, characterized in that: The plurality of spacers further include a fifth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, and an axial maximum thickness CP5 of the fifth spacer, an axial displacement SAG52 of an effective radius vertex from the intersection of the image side surface of the fifth lens and the optical axis to the image side surface of the fifth lens, an axial distance T56 from the image side surface of the fifth lens to the object side surface of the sixth lens, and an axial displacement SAG61 of an effective radius vertex from the intersection of the object side surface of the sixth lens and the optical axis to the object side surface of the sixth lens satisfy the following conditions: 30 <CP5 / (SAG52+T56+SAG61)<150。 10. The optical lens according to claim 1, characterized in that: The plurality of spacers further includes a sixth spacer, the sixth spacer being located on the image side of the sixth lens and in contact with the image side surface of the sixth lens, The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: (|f6|-|f7|) / |f6|<0.1; and An inner diameter d6s of the object side surface of the sixth spacer, an outer diameter D6s of the object side surface of the sixth spacer, a center thickness CT6 of the sixth lens and a center thickness CT7 of the seventh lens satisfy: 3<(d6s+D6s) / (CT6+CT7)<5.

11. The optical lens according to claim 1, characterized in that: The plurality of spacers further include a sixth spacer, the sixth spacer being located on the image side of the sixth lens and in contact with the image side surface of the sixth lens, and the combined focal length f67 of the sixth lens and the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer, and the inner diameter d6m of the image side surface of the sixth spacer satisfying: <f67 / (D6m-d6m)<17。 12. The optical lens according to claim 1, characterized in that: The outer diameter D0s of the object side of the lens barrel, the outer diameter D0m of the image side of the lens barrel and the effective focal length f of the optical lens satisfy the following conditions: 2<(D0s-D0m) / f<13; and The Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens and the Abbe number V7 of the seventh lens satisfy: V6>V5+V7.

13. The optical lens according to claim 1, characterized in that: The sixth lens is a glass lens, and the plurality of spacers further include a fifth spacer and a sixth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, the sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens, a curvature radius R12 of the image side surface of the sixth lens and a curvature radius R11 of the object side surface of the sixth lens satisfy: 5<(R12-R11) / (R12+R11)<6; a center thickness CT6 of the sixth lens and an axial distance EP56 from the image side surface of the fifth spacer to the object side surface of the sixth spacer satisfy: 2 <CT6 / EP56<3。 14. The optical lens according to claim 1, characterized in that: The plurality of spacers further include a sixth spacer and a seventh spacer, the sixth spacer being located on the image side of the sixth lens and in contact with the image side surface of the sixth lens, the seventh spacer being located on the image side of the seventh lens and in contact with the image side surface of the seventh lens, The displacement SAG62 on the axis from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens and the displacement SAG81 on the axis from the intersection of the object side surface of the eighth lens and the optical axis to the vertex of the effective radius of the object side surface of the eighth lens satisfy: -1 <SAG62 / SAG81<-0.5; The Abbe number V7 of the seventh lens and the Abbe number V8 of the eighth lens satisfy: V8>2*V7; The inner diameter d7s of the object side surface of the seventh spacer and the inner diameter d6m of the image side surface of the sixth spacer satisfy 1 <d7s / d6m<1.5。 15. The optical lens according to claim 14, characterized in that: The inner diameter d0m of the image side surface of the lens barrel and the outer diameter D6s of the object side surface of the sixth spacer satisfy the following conditions: 1 <d0m / D6s<1.5。 16. The optical lens according to claim 1, characterized in that: The multiple spacers also include a sixth spacer and a seventh spacer, the sixth spacer is located on the image side of the sixth lens and in contact with the image side surface of the sixth lens, the seventh spacer is located on the image side of the seventh lens and in contact with the image side surface of the seventh lens, the axial maximum thickness CP6 of the sixth spacer, the axial distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh lens, the axial maximum thickness CP7 of the seventh spacer, the axial displacement SAG62 of the effective radius vertex from the intersection of the image side surface of the sixth lens and the optical axis to the image side surface of the sixth lens, and the axial displacement SAG81 of the effective radius vertex from the intersection of the object side surface of the eighth lens and the optical axis to the object side surface of the eighth lens satisfy the following: 2<(CP6+EP67+CP7) / (SAG62+SAG81)<16.

17. The optical lens according to claim 16, characterized in that: The multiple spacers also include a seventh auxiliary spacer, which is located on the image side of the seventh spacer and in contact with the seventh spacer, and the axial maximum thickness CP6 of the sixth spacer, the axial distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh lens, the axial maximum thickness CP7 of the seventh spacer, the axial maximum thickness CP7b of the seventh auxiliary spacer, the axial displacement SAG62 of the effective radius vertex from the intersection of the image side surface of the sixth lens and the optical axis to the image side surface of the sixth lens, and the axial displacement SAG81 of the effective radius vertex from the intersection of the object side surface of the eighth lens and the optical axis to the object side surface of the eighth lens satisfy: 5<(CP6+EP67+CP7+CP7b) / (SAG62+SAG81)<20.

18. The optical lens according to claim 1, characterized in that: The maximum effective radius of the first lens to the fourth lens decreases one by one, and among the plurality of spacers, the inner diameter value of the object side surface of the fourth spacer is the smallest, The multiple spacers also include a second spacer and a fourth spacer, the second spacer is located on the image side of the second lens and contacts the image side surface of the second lens, the fourth spacer is located on the image side of the fourth lens and contacts the image side surface of the fourth lens, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 2<|f1+f2| / |f3+f4|<15; the inner diameter d2s of the object side surface of the second spacer, the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d4s of the object side surface of the fourth spacer and the inner diameter d2m of the image side surface of the second spacer satisfy: 5<(d2s-d0s) / (d4s-d2m)<10.

19. The optical lens according to claim 1, characterized in that: The multiple spacers also include a fourth spacer and a fifth spacer, the fourth spacer is located on the image side of the fourth lens and contacts the image side surface of the fourth lens, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, the on-axis distance EP34 from the image side surface of the third spacer to the object side surface of the fourth spacer, the on-axis distance EP45 from the image side surface of the fourth spacer to the object side surface of the fifth spacer, and the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy: 0.8<(EP34 / EP45) / (CT4 / CT5)<2.

20. The optical lens according to claim 19, characterized in that: The plurality of spacers further include a second spacer, the second spacer is located on the image side of the second lens and contacts the image side surface of the second lens, and an axial distance EP23 from the image side surface of the second spacer to the object side surface of the third spacer satisfies the following relationship with a center thickness CT3 of the third lens: 1 <EP23 / CT3<1.6。 21. An optical lens, characterized in that: The lens barrel comprises eight lenses and a plurality of spacers arranged in the lens barrel. The lens barrel has a central through hole, and the central through hole is arranged with the optical axis as the central axis; The eight lenses include, in order from the object side to the image side along the optical axis, a first lens with negative optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, and an eighth lens with positive optical power; The plurality of spacers include at least a third spacer, the third spacer being located on the image side of the third lens and in contact with the image side surface of the third lens; The refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: 1 <N1 / N2<1.5; The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the inner diameter d0s of the object side of the lens barrel and the inner diameter d3s of the object side of the third spacer satisfy: -2<(f1+f2+f3) / (d0s-d3s)<-0.

5.

22. The optical lens according to claim 21, characterized in that: The maximum field of view FOV of the optical lens and the aperture coefficient Fno of the optical lens satisfy: 0.5 < tan(FOV / 4) / Fno < 1.

23. The optical lens according to claim 21, characterized in that: The inner diameter d0s of the object side of the lens barrel, the inner diameter d3s of the object side of the third spacer, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the central thickness CT3 of the third lens satisfy: 3.5 < (d0s - d3s) / (CT1 + CT2 + CT3) < 5.

5.

24. The optical lens according to claim 21, wherein The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: 1 < f1 / f2 < 1.8; and The plurality of spacers further includes a second spacer, the second spacer is located on the image side of the second lens and contacts the image side surface of the second lens, and the axial distance EP02 from the object side surface of the lens barrel to the object side surface of the second spacer, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 0.5 < EP02 / (CT1 + CT2) < 2.

5.

25. The optical lens according to claim 21, characterized in that: The effective radius DT11 of the object side surface of the first lens, the inner diameter d0m of the image side surface of the lens barrel, the effective focal length f1 of the first lens, and the effective focal length f of the optical lens satisfy: -6 < f1 / f < -4 and 0.7 < DT11 / d0m < 2.

26. The optical lens according to claim 21, wherein The on-axis distance TD from the object side surface of the first lens to the image side surface of the eighth lens is greater than the on-axis distance L from the object side surface to the image side surface of the lens barrel The on-axis distance TD from the object side surface of the first lens to the image side surface of the eighth lens, the on-axis distance L from the object side surface to the image side surface of the lens barrel, the central thickness CT1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: -0.1 < (TD - L - CT1) / (R1 - R2) < 0.

2.

27. The optical lens according to claim 21, characterized in that: The first lens is a glass lens, The axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the central thickness CT1 of the first lens satisfy: 1 < T12 / CT1 < 3.5; and The axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the outer diameter D0s of the object side surface of the lens barrel satisfy: 5 < D0s / T12 < 7.

28. The optical lens according to claim 21, characterized in that: The plurality of spacers further includes a fifth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, and the on-axis distance CP5 from the object side surface to the image side surface of the fifth spacer and the on-axis distance T56 from the image side surface of the fifth lens to the object side surface of the sixth lens satisfy: 6 < CP5 / T56 < 9.

29. The optical lens according to claim 21, wherein The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the radius of curvature R10 of the image side of the fifth lens, and the radius of curvature R11 of the object side of the sixth lens satisfy: 0.9 < (f5 - f6) / (R10 + R11) < 1; and The plurality of spacers further includes a fifth spacer. The fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens. The inner diameter d0s of the object side surface of the lens barrel, the inner diameter d5s of the object side surface of the fifth spacer, the inner diameter d0m of the image side surface of the lens barrel, and the inner diameter d5m of the image side surface of the fifth spacer satisfy: 2 < (d0s - d5s) / (d0m - d5m) < 10.

30. The optical lens according to claim 21, wherein The effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: 2 < (f4 + f5 + f6) / f5 < 3; and The plurality of spacers further includes a second spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a seventh spacer. The second spacer is located on the image side of the second lens and contacts the image side surface of the second lens. The fourth spacer is located on the image side of the fourth lens and contacts the image side surface of the fourth lens. The fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens. The sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens. The seventh spacer is located on the image side of the seventh lens and contacts the image side surface of the seventh lens, satisfying: 0.3 < CP5 / ∑CPi < 1, where i = 2, 3, 4, 5, 6, 7. Here, CP5 is the maximum axial thickness of the fifth spacer, and ∑CPi is the sum of the maximum axial thicknesses of the second spacer, the third spacer, the fourth spacer, the fifth spacer, the sixth spacer, and the seventh spacer.

31. The optical lens according to claim 21, characterized in that: The plurality of spacers further includes a fifth spacer. The fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens. The maximum axial thickness CP5 of the fifth spacer, the displacement SAG52 on the axis from the intersection point of the image side surface of the fifth lens and the optical axis to the vertex of the effective radius of the image side surface of the fifth lens, the axial distance T56 from the image side surface of the fifth lens to the object side surface of the sixth lens, and the displacement SAG61 on the axis from the intersection point of the object side surface of the sixth lens and the optical axis to the vertex of the effective radius of the object side surface of the sixth lens satisfy: 30 < CP5 / (SAG52 + T56 + SAG61) < 150.

32. The optical lens according to claim 21, characterized in that: The plurality of spacers further includes a sixth spacer. The sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens, The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: (|f6| - |f7|) / |f6| < 0.1; and An inner diameter d6s of the object side surface of the sixth spacer, an outer diameter D6s of the object side surface of the sixth spacer, a center thickness CT6 of the sixth lens and a center thickness CT7 of the seventh lens satisfy: 3<(d6s+D6s) / (CT6+CT7)<5.

33. The optical lens according to claim 21, characterized in that: The plurality of spacers further include a sixth spacer, the sixth spacer being located on the image side of the sixth lens and in contact with the image side surface of the sixth lens, and the combined focal length f67 of the sixth lens and the seventh lens, the outer diameter D6m of the image side surface of the sixth spacer, and the inner diameter d6m of the image side surface of the sixth spacer satisfying: <f67 / (D6m-d6m)<17。 34. The optical lens according to claim 21, characterized in that: The outer diameter D0s of the object side of the lens barrel, the outer diameter D0m of the image side of the lens barrel and the effective focal length f of the optical lens satisfy the following conditions: 2<(D0s-D0m) / f<13; and The Abbe number V6 of the sixth lens, the Abbe number V5 of the fifth lens and the Abbe number V7 of the seventh lens satisfy: V6>V5+V7.

35. The optical lens according to claim 21, characterized in that: The sixth lens is a glass lens, and the plurality of spacers further include a fifth spacer and a sixth spacer, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, the sixth spacer is located on the image side of the sixth lens and contacts the image side surface of the sixth lens, a curvature radius R12 of the image side surface of the sixth lens and a curvature radius R11 of the object side surface of the sixth lens satisfy: 5<(R12-R11) / (R12+R11)<6; a center thickness CT6 of the sixth lens and an axial distance EP56 from the image side surface of the fifth spacer to the object side surface of the sixth spacer satisfy: 2 <CT6 / EP56<3。 36. The optical lens according to claim 21, characterized in that: The plurality of spacers further include a sixth spacer and a seventh spacer, the sixth spacer being located on the image side of the sixth lens and in contact with the image side surface of the sixth lens, the seventh spacer being located on the image side of the seventh lens and in contact with the image side surface of the seventh lens, The displacement SAG62 on the axis from the intersection of the image side surface of the sixth lens and the optical axis to the vertex of the effective radius of the image side surface of the sixth lens and the displacement SAG81 on the axis from the intersection of the object side surface of the eighth lens and the optical axis to the vertex of the effective radius of the object side surface of the eighth lens satisfy: -1 <SAG62 / SAG81<-0.5; The Abbe number V7 of the seventh lens and the Abbe number V8 of the eighth lens satisfy: V8>2*V7; The inner diameter d7s of the object side surface of the seventh spacer and the inner diameter d6m of the image side surface of the sixth spacer satisfy 1 <d7s / d6m<1.5。 37. The optical lens according to claim 36, characterized in that: The inner diameter d0m of the image side surface of the lens barrel and the outer diameter D6s of the object side surface of the sixth spacer satisfy the following conditions: 1 <d0m / D6s<1.5。 38. The optical lens according to claim 21, characterized in that: The multiple spacers also include a sixth spacer and a seventh spacer, the sixth spacer is located on the image side of the sixth lens and in contact with the image side surface of the sixth lens, the seventh spacer is located on the image side of the seventh lens and in contact with the image side surface of the seventh lens, the axial maximum thickness CP6 of the sixth spacer, the axial distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh lens, the axial maximum thickness CP7 of the seventh spacer, the axial displacement SAG62 from the intersection of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens, and the axial displacement SAG81 from the intersection of the object side surface of the eighth lens and the optical axis to the effective radius vertex of the object side surface of the eighth lens satisfy the following: 2<(CP6+EP67+CP7) / (SAG62+SAG81)<16.

39. The optical lens according to claim 38, characterized in that: The multiple spacers also include a seventh auxiliary spacer, which is located on the image side of the seventh spacer and in contact with the seventh spacer, and the axial maximum thickness CP6 of the sixth spacer, the axial distance EP67 from the image side surface of the sixth spacer to the object side surface of the seventh lens, the axial maximum thickness CP7 of the seventh spacer, the axial maximum thickness CP7b of the seventh auxiliary spacer, the axial displacement SAG62 of the effective radius vertex from the intersection of the image side surface of the sixth lens and the optical axis to the image side surface of the sixth lens, and the axial displacement SAG81 of the effective radius vertex from the intersection of the object side surface of the eighth lens and the optical axis to the object side surface of the eighth lens satisfy: 5<(CP6+EP67+CP7+CP7b) / (SAG62+SAG81)<20.

40. The optical lens according to claim 21, characterized in that: The maximum effective radius of the first lens to the fourth lens decreases one by one, and among the plurality of spacers, the inner diameter value of the object side surface of the fourth spacer is the smallest, The multiple spacers also include a second spacer and a fourth spacer, the second spacer is located on the image side of the second lens and contacts the image side surface of the second lens, the fourth spacer is located on the image side of the fourth lens and contacts the image side surface of the fourth lens, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: 2<|f1+f2| / |f3+f4|<15; the inner diameter d2s of the object side surface of the second spacer, the inner diameter d0s of the object side surface of the lens barrel, the inner diameter d4s of the object side surface of the fourth spacer and the inner diameter d2m of the image side surface of the second spacer satisfy: 5<(d2s-d0s) / (d4s-d2m)<10.

41. The optical lens according to claim 21, characterized in that: The multiple spacers also include a fourth spacer and a fifth spacer, the fourth spacer is located on the image side of the fourth lens and contacts the image side surface of the fourth lens, the fifth spacer is located on the image side of the fifth lens and contacts the image side surface of the fifth lens, the on-axis distance EP34 from the image side surface of the third spacer to the object side surface of the fourth spacer, the on-axis distance EP45 from the image side surface of the fourth spacer to the object side surface of the fifth spacer, and the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens satisfy: 0.8<(EP34 / EP45) / (CT4 / CT5)<2.

42. The optical lens according to claim 41, characterized in that: The plurality of spacers further include a second spacer, the second spacer is located on the image side of the second lens and contacts the image side surface of the second lens, and an axial distance EP23 from the image side surface of the second spacer to the object side surface of the third spacer satisfies the following relationship with a center thickness CT3 of the third lens: 1 <EP23 / CT3<1.6。

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