Full-glass all-round-looking day and night confocal optical system and camera module applied by same

Abstract

The invention relates to the technical field of optical imaging, in particular to a full-glass around-view day and night confocal optical system and a camera module applying the same, mainly comprising seven lenses, the first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface, the second lens has negative focal power, and the image side surface is a concave surface. The third lens has positive focal power, the object side surface is a convex surface, the image side surface is a convex surface, the fourth lens has positive focal power, the image side surface is a convex surface, the fifth lens has positive focal power, the image side surface is a convex surface, the sixth lens has negative focal power, the image side surface is a concave surface, the seventh lens has positive focal power, the object side surface is a convex surface, and the image side surface is a convex surface. The sixth lens and the seventh lens are bonded to form a combined lens, and through reasonable distribution of the surface type and the focal power of each lens, the large field angle is met, the picture illumination uniformity and the imaging definition are improved, the reliability is improved, the size is reduced, the aberration of an optical system is optimized, and the resolution power is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, and particularly relates to a full-glass ring view day and night confocal optical system and a camera module applied thereto. BACKGROUND

[0002] With the progress of science and technology and the development of social economy, camera modules are widely applied to the field of intelligent driving. In recent years, intelligent driving technology has developed rapidly, and vehicle-mounted camera modules, as core and key components of intelligent driving systems, are related to the safety of vehicles using intelligent driving systems. However, the existing camera modules or optical systems have defects such as large volume, low resolution, small field of view, poor reliability and poor day and night effect, which are difficult to meet the requirements of users. SUMMARY

[0003] The present application aims to provide a full-glass ring view day and night confocal optical system and a camera module applied thereto, which can simultaneously meet the requirements of miniaturization, high resolution, large field of view and high reliability, and solve the problems of large volume, low resolution, small field of view and poor reliability of the existing camera modules or optical systems.

[0004] To solve the above problems, the present application provides the following technical solutions: A full-glass ring view day and night confocal optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object plane to an image plane along an optical axis. The first lens has a negative focal power, and its object side surface is a convex surface and its image side surface is a concave surface. The second lens has a negative focal power, and its object side surface is a convex surface and its image side surface is a concave surface. The third lens has a positive focal power, and its object side surface is a convex surface and its image side surface is a convex surface. The fourth lens has a positive focal power, and its object side surface is a concave surface and its image side surface is a convex surface. The fifth lens has a positive focal power, and its object side surface is a convex surface and its image side surface is a convex surface. The sixth lens has a negative focal power, and its image side surface is a concave surface. The seventh lens has a positive focal power, and its object side surface is a convex surface and its image side surface is a convex surface. The sixth lens and the seventh lens are bonded to form a combined lens.

[0005] The full-glass ring view day and night confocal optical system as described above satisfies the following relationships: -7.5mm < f1 < -4.5mm; -6.0mm < f2 < -3.0mm; 5.0mm < f3 < 8.0mm; 10.0 mm < f4 < 15.0 mm; 4.0 mm < f5 < 6.5 mm; -6.0 mm < f6 < -3.0 mm; 3.0 mm < f7 < 6.0 mm; wherein fi is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens.

[0006] An all-glass fisheye day and night confocal optical system as described above, which satisfies the following relationships: -4.8 < f1 / f < -3.0; -3.7 < f2 / f < -2.0; 3.0 < f3 / f < 5.0; 5.0 < f4 / f < 10.0; 2.0 < f5 / f < 4.0; -3.7 < f6 / f < -2.0; 2.0 < f7 / f < 3.8; wherein fi is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens, and f is the total focal length of the optical system.

[0007] An all-glass fisheye day and night confocal optical system as described above, which satisfies the following relationships: -1.2 < f6 / f7 < -0.8; wherein f6 is the focal length of the sixth lens and f7 is the focal length of the seventh lens.

[0008] An all-glass fisheye day and night confocal optical system as described above, which satisfies the following relationships: 2.0 < R2 / f < 3.0; | R3 / R2 | > 8.0; wherein f is the total focal length of the optical system, R2 is the image-side curvature of the first lens, and R3 is the object-side curvature of the second lens.

[0009] An all-glass fisheye day and night confocal optical system as described above, which satisfies the following relationships: 0.6 < | R5 / R6 | < 1.5; wherein f is the total focal length of the entire optical system, R5 is the object-side curvature of the third lens, and R6 is the image-side curvature of the third lens.

[0010] The full-glass ring view day and night confocal optical system satisfies the following relationship: 0.7<|T1 / T2|<1.0; Wherein, T1 is the distance from the image side vertex of the first lens to the aperture stop, and T2 is the distance from the aperture stop to the image plane.

[0011] The full-glass ring view day and night confocal optical system has a total length TTL≤19 mm. The first lens, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are glass spherical lenses, and the fifth lens is a glass aspherical lens.

[0012] The full-glass ring view day and night confocal optical system satisfies the following relationship: 2.5° / mm 2 <FOV / H / D<5.0° / mm 2 ; 2.5<H / f<5.0; Wherein, H is the total image height of the optical system, f is the total focal length of the optical system, D is the front full aperture of the optical system, and FOV is the total field angle of the optical system.

[0013] The full-glass ring view day and night confocal optical system satisfies the following relationship: 0.1mm -1 <D / TTL / H<0.2 mm -1 ; Wherein, H is the total image height of the optical system, D is the front full aperture of the optical system, and TTL is the total length of the optical system.

[0014] The application also provides a camera module comprising at least an optical lens, wherein the optical lens is internally mounted with the full-glass ring view day and night confocal optical system.

[0015] Compared with the prior art, the application has the following advantages: The application provides a full-glass ring day and night confocal optical system and an applied camera module, which mainly comprises seven lenses, the surface shape and optical power of each lens are reasonably distributed, the picture illumination uniformity and imaging definition are improved while the large field angle is met, the lens reliability is improved, the volume is reduced, the optical system aberration is optimized, the imaging power is improved, the combination lens is formed by bonding the sixth lens and the seventh lens, chromatic aberration is weakened, and the day and night confocal effect is realized. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Figure 1 It is a structural schematic diagram of the optical system or the camera module of the embodiment 1 of the present application. Figure 2 It is a field curvature curve and a distortion curve of the optical system or the camera module of the embodiment 1 of the present application. Figure 3 It is a structural schematic diagram of the optical system or the camera module of the embodiment 2 of the present application. Figure 4 It is a field curvature curve and a distortion curve of the optical system or the camera module of the embodiment 2 of the present application. Figure 5 It is a structural schematic diagram of the optical system or the camera module of the embodiment 3 of the present application. Figure 6 It is a field curvature curve and a distortion curve of the optical system or the camera module of the embodiment 3 of the present application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0018] As Figures 1 to 6As shown, the embodiment of the present application provides a full-glass ring day and night confocal optical system, which is sequentially composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 along an optical axis from an object plane to an image plane; the first lens E1 has a negative focal length, the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface; the second lens E2 has a negative focal length, and the image side surface thereof is a concave surface; the third lens E3 has a positive focal length, the object side surface thereof is a convex surface, and the image side surface thereof is a convex surface; the fourth lens E4 has a positive focal length, the object side surface thereof is a concave surface, and the image side surface thereof is a convex surface; the fifth lens E5 has a positive focal length, and the image side surface thereof is a convex surface; the sixth lens E6 has a negative focal length, and the image side surface thereof is a concave surface; the seventh lens E7 has a positive focal length, the object side surface thereof is a convex surface, and the image side surface thereof is a convex surface; and the sixth lens E6 and the seventh lens E7 are bonded to form a combined lens.

[0019] The full-glass ring day and night confocal optical system provided by the embodiment of the present application is mainly composed of seven lenses, the surface shape and the focal length of each lens are reasonably distributed, the picture illumination uniformity and the imaging clarity are improved while the large field of view is met, the lens reliability is improved, the volume is reduced, the optical system aberration is optimized, the imaging power is improved, the sixth lens E6 and the seventh lens E7 are bonded to form a combined lens, the chromatic aberration is weakened, and the day and night confocal effect is realized.

[0020] Specifically, if the sixth lens E6 and the seventh lens E7 are completely separated structures, there is a distance between the sixth lens E6 and the seventh lens E7, there is an error in the light focusing transmission process, and the imaging effect is affected. The sixth lens E6 and the seventh lens E7 are bonded to form a combined lens, which can effectively focus light of different wavelengths to a similar position, thereby weakening the chromatic aberration, achieving better imaging effect, and being beneficial to realize day and night confocal.

[0021] Further, the optical system satisfies the following relationships: -7.5mm < f1 < -4.5mm; -6.0mm < f2 < -3.0mm; 5.0mm < f3 < 8.0mm; 10.0mm < f4 < 15.0mm; 4.0mm < f5 < 6.5mm; -6mm < f6 < -3mm; 3.0mm < f7 < 6.0mm; wherein f1 is the focal length of the first lens E1, f2 is the focal length of the second lens E2, f3 is the focal length of the third lens E3, f4 is the focal length of the fourth lens E4, f5 is the focal length of the fifth lens E5, f6 is the focal length of the sixth lens E6, and f7 is the focal length of the seventh lens E7. By reasonably controlling the focal length of each lens of the optical system, the optical system satisfies the large field of view, the effective diameter of the part is limited, the size of the overall optical system is reduced, and the light incidence angle is adjusted, which is beneficial to correct the system aberration.

[0022] Further, the optical system satisfies the following relationship: -4.8 < f1 / f < -3.0; -3.7 < f2 / f < -2.0; 3.0 < f3 / f < 5.0; 5.0 < f4 / f < 10.0; 2.0 < f5 / f < 4.0; -3.7 < f6 / f < -2.0; 2.0 < f7 / f < 3.8; wherein f is the total focal length of the optical system. By reasonably controlling the ratio of the focal length of each lens to the total focal length of the optical system, the optical system obtains a reasonable light deflection angle, effectively reduces the part tolerance sensitivity, improves the manufacturing yield, thereby reduces the production cost, and improves the system aberration.

[0023] Further, the optical system satisfies the following relationship: -1.2 < f6 / f7 < -0.8; wherein f6 is the focal length of the sixth lens E6, and f7 is the focal length of the seventh lens E7. By controlling the focal length ratio of the sixth lens E6 and the seventh lens E7, the aberration generated by the front group lens can be obviously corrected, better resolution is achieved, and high resolution is achieved.

[0024] Further, the optical system satisfies the following relationship: 2.0 < R2 / f < 3.0; |R3 / R2| > 8.0; wherein f is the total focal length of the optical system, R2 is the image-side curvature of the first lens E1, and R3 is the object-side curvature of the second lens E2. Under the condition that the focal length is unchanged, by controlling the image-side curvature R2 of the first lens E1, more light can be effectively entered from the front end, better imaging effect is achieved, and based on this, by reasonably controlling the ratio of the object-side curvature R3 of the second lens E2 to the image-side curvature R2 of the first lens E1, the light between R2 and R3 can be effectively controlled, the processing difficulty is reduced, high resolution is achieved, weak ghost image is achieved, and the part tolerance sensitivity is reduced.

[0025] Further, the optical system satisfies the following relationship: 0.6 < |R5 / R6| < 1.5; wherein R5 is the object-side curvature of the third lens E3, and R6 is the image-side curvature of the third lens E3. By reasonably controlling the object-side curvature R5 of the third lens E3 and the image-side curvature R6 of the third lens E3, the light can smoothly pass through the aperture stop, better resolution capability is achieved, high resolution is achieved, the part tolerance sensitivity is reduced, higher manufacturing yield is achieved, and the production manufacturing cost is reduced.

[0026] Further, the optical system satisfies the following relationship: 0.7 < |T1 / T2| < 1.0; wherein T1 is the distance from the object side surface of the first lens E1 to the aperture stop, and T2 is the distance from the aperture stop to the image surface. Under the condition that the total length of the optical system is unchanged, by reasonably controlling the position of the aperture stop, it is beneficial to control the aperture of the front end of the optical system, reduce the system volume, balance the primary aberrations such as coma and astigmatism of the optical system, and effectively help to achieve better resolution.

[0027] Further, the optical system has a full field of view FOV in [200°, 220°], and a total length TTL of the optical system is less than or equal to 19.0 mm. The design of the large field of view of the optical system effectively meets the actual demand of the large field of view of the optical system.

[0028] Further, the optical system satisfies the following relationship: 2.5° / mm 2 <FOV / H / D<5.0° / mm 2 ; 2.5<H / f<5.0; wherein H is a full image height of the optical system, f is a total focal length of the optical system, D is a front end full aperture of the optical system, and FOV is a full field of view of the optical system. In the state of fixed focal length, the larger effective image surface is met, the larger field of view is realized, and the requirements of small front end and miniaturization are met.

[0029] Further, the optical system satisfies the following relationship: 0.1 mm -1 <D / TTL / H<0.2 mm -1 ; wherein H is a full image height of the optical system, D is a front end full aperture of the optical system, and TTL is a total length of the optical system. In the condition of fixed image height and total length, the front end of the lens is effectively limited, the small front end is realized, and the miniaturization demand is met.

[0030] Further, the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the sixth lens E6 and the seventh lens E7 of the optical system are glass spherical lenses, and the fifth lens E5 is a glass aspherical lens.

[0031] The embodiment of the present application also provides a camera module, which at least comprises an optical lens, and the optical lens is internally installed with the all-glass ring view day and night confocal optical system as described above. The camera module provided by the present application is mainly composed of seven lenses. Through reasonable distribution of the surface type and optical power of each lens, the picture illumination uniformity and imaging clarity are improved while the large field of view is met, the lens reliability is improved, the volume is reduced, the optical system aberration is optimized, the imaging power is improved, and the sixth lens E6 and the seventh lens E7 are adhered to form a combined lens, the chromatic aberration is weakened, and the day and night confocal effect is realized.

[0032] Embodiment 1 Specifically, as a preferred embodiment of the present application but not limited, as Figure 1 and Figure 2As shown, the embodiment includes, in order from the object plane to the image plane along the optical axis, a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and a chip protection lens E9. The first lens E1 has a negative focal length, the object side S1 is a convex surface, and the image side S2 is a concave surface. The second lens E2 has a negative focal length, the object side S3 is a convex surface, and the image side S4 is a concave surface. The third lens E3 has a positive focal length, the object side S5 is a convex surface, and the image side S6 is a convex surface. The fourth lens E4 has a positive focal length, the object side S8 is a concave surface, and the image side S9 is a convex surface. The fifth lens E5 has a positive focal length, the object side S10 is a convex surface, and the image side S11 is a convex surface. The sixth lens E6 has a negative focal length, the object side S12 is a convex surface, and the image side S13 is a concave surface. The seventh lens E7 has a positive focal length, the object side S13 is a convex surface, and the image side S14 is a convex surface. The sixth lens E6 and the seventh lens E7 are bonded to form a combined lens, so the image side S13 of the sixth lens E6 is the object side S13 of the seventh lens E7. The filter E8 has an object side S15 and an image side S16, and the chip protection lens E9 has an object side S17 and an image side S18. Light from the object passes through each surface of the first lens E1, the second lens E2, the third lens E3, the STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the filter E8, and the chip protection lens E9 in order, and is finally imaged on the imaging surface S19.

[0033] Table 1: Basic parameters of the optical system of Example 1

[0034] In Table 1, OBJ is the object plane, and STO is the position of the stop. The object side and the image side of the fifth lens E5 are both aspherical surfaces, and the aspherical surface of the lens can be defined by, but is not limited to, the following aspherical surface formula:

[0035] where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface formula, and n is the highest order of the multiple terms.

[0036] Table 2 gives the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 of the aspherical surfaces that can be used in Example 1.

[0037] Table 2: Aspherical surface-related values of the lens surface of Example 1

[0038] like Figure 2 The field curvature and distortion curves of the optical imaging lens of Embodiment 1 are shown, demonstrating that the optical system provided in Embodiment 1 can achieve good imaging quality.

[0039] Example 2 Specifically, as another preferred embodiment of the present invention and not a limitation thereof, such as Figure 3 and Figure 4 As shown, this embodiment includes, along the optical axis from the object plane to the image plane, a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and a chip protection lens E9. The first lens E1 has negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has negative optical power, its object-side surface S3 is convex, and its image-side surface S4 is concave. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S8 is concave, and its image-side surface S9 is concave. S9 is a convex surface; the fifth lens E5 has positive optical power, its object-side surface S10 is convex, and its image-side surface S11 is convex; the sixth lens E6 has negative optical power, its object-side surface S12 is flat, and its image-side surface S13 is concave; the seventh lens E7 has positive optical power, its object-side surface S13 is convex, and its image-side surface S14 is convex; since the sixth lens E6 and the seventh lens E7 are bonded together to form a combined lens, the image-side surface S13 of the sixth lens E6 is also the object-side surface S13 of the seventh lens E7. The filter E8 has an object-side surface S15 and an image-side surface S16, and the chip protection lens E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through the first lens E1, the second lens E2, the third lens E3, S10, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the filter E8, and the chip protection lens E9, and finally forms an image on the imaging surface S19.

[0040] Table 3 Basic parameters of the optical system in Example 2

[0041] In Table 3, OBJ represents the object plane, and STO represents the location of the aperture stop. The object-side and image-side surfaces of the fifth lens, E5, are both aspherical. The surface shape of its aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0042] wherein x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, Ai is the coefficient corresponding to the i-th high order term in the aspherical surface formula, and n is the highest order of the multiple terms.

[0043] Table 4 gives the conic coefficient and high order term coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspherical surface used in Example 2.

[0044] Table 4 Aspherical surface related values of the lens surface in Example 2

[0045] As Figure 4 The field curvature curve and distortion curve of the optical imaging lens of Example 2 shown in the figure show that the optical system given in Example 2 can achieve good imaging quality.

[0046] Example 3 Specifically, as a preferred embodiment of the present application but not limited, as shown in Figure 5 and Figure 6 The present embodiment includes, in order from the object plane to the image plane along the optical axis, a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and a chip protection lens E9; wherein the first lens E1 has a negative focal power, the object side surface S1 thereof is a convex surface, and the image side surface S2 thereof is a concave surface; the second lens E2 has a negative focal power, the object side surface S3 thereof is a convex surface, and the image side surface S4 thereof is a concave surface; the third lens E3 has a positive focal power, the object side surface S5 thereof is a convex surface, and the image side surface S6 thereof is a convex surface; the fourth lens E4 has a positive focal power, the object side surface S8 thereof is a concave surface, and the image side surface S9 thereof is a convex surface; the fifth lens E5 has a positive focal power, the object side surface S10 thereof is a convex surface, and the image side surface S11 thereof is a convex surface; the sixth lens E6 has a negative focal power, the object side surface S2 thereof is a concave surface, and the image side surface S13 thereof is a concave surface; the seventh lens E7 has a positive focal power, the object side surface S13 thereof is a convex surface, and the image side surface S14 thereof is a convex surface; wherein the image side surface S13 of the sixth lens E6 is the object side surface S13 of the seventh lens E7 because the sixth lens E6 and the seventh lens E7 are bonded to form a combined lens; the filter E8 has an object side surface S15 and an image side surface S16; and the chip protection lens E9 has an object side surface S17 and an image side surface S18. Light from an object passes through each surface of the first lens E1, the second lens E2, the third lens E3, the STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the filter E8, and the chip protection lens E9 in order, and is finally imaged on the imaging surface S19.

[0047] Table 5 Basic parameters of the optical system of Example 3

[0048] In Table 5, OBJ is the object plane, and STO is the position of the stop. The object side and the image side of the fifth lens E5 are both aspherical surfaces, and the aspherical surface can be defined by the following aspherical surface formula, but is not limited thereto:

[0049] Wherein, x is the distance from the corresponding point on the aspherical surface to the tangent plane at the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface formula, and n is the highest order of the multiple terms.

[0050] Table 6 gives the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspherical surface that can be used in Example 3.

[0051] Table 6 Aspherical surface related numerical values of the lens surface of Example 3

[0052] As Figure 6 The field curvature curve and the distortion curve of the optical imaging lens of Example 3 are shown, and it can be seen that the optical system given in Example 3 can achieve good imaging quality.

[0053] The basic data in Example 1, Example 2 and Example 3 of the embodiment of the application are shown in Table 7, and the values corresponding to each condition formula are shown in Table 8.

[0054] Table 7 Basic data of Examples 1-3

[0055] Table 8 Condition formula data of Examples 1-3

[0056] The all-glass ring view day and night confocal optical system and the application of the camera module thereof provided by the application are mainly composed of seven lenses. By reasonably distributing the surface shape and the focal power of each lens, the picture illumination uniformity and the imaging clarity are improved while meeting the large field of view, the production cost is reduced, the volume is reduced, the optical system aberration is optimized, the imaging power is improved, and the combination lens is formed by bonding the sixth lens and the seventh lens, the chromatic aberration is weakened, which is conducive to realizing the day and night confocal effect.

[0057] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the technical field, without departing from the principles of the present application, can also make a number of improvements and variations, these improvements and variations are also considered to be within the scope of the present application.

Claims

1. A full-glass all-glass ring vision day and night confocal optical system, sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object plane to an image plane along an optical axis, characterized in that: the first lens has a negative focal power, and a convex object side surface and a concave image side surface; the second lens has a negative focal power, and a convex object side surface and a concave image side surface; the third lens has a positive focal power, and a convex object side surface and a convex image side surface; the fourth lens has a positive focal power, and a concave object side surface and a convex image side surface; the fifth lens has a positive focal power, and a convex object side surface and a convex image side surface; the sixth lens has a negative focal power, and a concave image side surface; and the seventh lens has a positive focal power, and a convex object side surface and a convex image side surface; the sixth lens and the seventh lens are bonded to form a combined lens; the optical system satisfies the following relationships: -7.5mm < f1 < -4.5mm; -6.0mm < f2 < -3.0mm; 5.0mm < f3 < 8.0mm; 10.0mm < f4 < 15.0mm; 4.0mm < f5 < 6.5mm; -6.0mm < f6 < -3.0mm; 3.0mm < f7 < 6.0mm; wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens. the optical system satisfies the following relationships: -4.8 < f1 / f < -3.0; -3.7 < f2 / f < -2.0; 3.0 < f3 / f < 5.0; 5.0 < f4 / f < 10.0; 2.0 < f5 / f < 4.0; -3.7 < f6 / f < -2.0; 2.0 < f7 / f < 3.8; wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, and f is the total focal length of the optical system. the optical system satisfies the following relationships: -1.2 < f6 / f7 < -0.8; wherein f6 is the focal length of the sixth lens, and f7 is the focal length of the seventh lens. the optical system satisfies the following relationships: 2.0 < R2 / f < 3.0; |R3 / R2| > 8.0; wherein f is the total focal length of the optical system, R2 is the image side curvature of the first lens, and R3 is the object side curvature of the second lens. the optical system satisfies the following relationships: 0.6 < |R5 / R6| < 1.5; wherein f is the total focal length of the optical system, R5 is the object side curvature of the third lens, and R6 is the image side curvature of the third lens. the aperture stop of the optical system is located between the third lens and the fourth lens, and the optical system satisfies the following relationships: 0.7 < |T1 / T2| < 1.0; ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. A full-glass loop-vision day-and-night confocal optical system according to claim 1, characterized in that, ​ ​ ​ ​ ​ ​ ​ ​ ​ 3. A full-glass loop-vision day-and-night confocal optical system according to claim 1, characterized in that, ​ ​ ​ 4. A full-glass looped see-around-the-clock day-and-night confocal optical system according to any one of claims 1-3, characterized in that, ​ ​ ​ ​ 5. A full-glass looped see-around-the-clock day-and-night confocal optical system according to any one of claims 1-3, characterized in that, ​ ​ ​ 6. A full-glass loop-vision day-and-night confocal optical system according to any one of claims 1-3, characterized in that, ​ ​ Wherein, T1 is the distance from the image side vertex of the first lens to the aperture stop, and T2 is the distance from the aperture stop to the image plane.

7. A full-glass looped see-around-the-corner day-and-night confocal optical system according to any one of claims 1-3, characterized in that, The full field of view FOV of the optical system is in the range of [200°, 220°], and the total length TTL of the optical system is less than or equal to 19 mm. The first lens, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are glass spherical lenses, and the fifth lens is a glass aspherical lens.

8. A full-glass loop-vision day-and-night confocal optical system according to any one of claims 1-3, characterized in that, The optical system satisfies the following relationship: 2.5° / mm 2 < FOV / H / D <5.0° / mm 2 ; 2.5 < H / f < 5.0; Wherein, H is the full image height of the optical system, f is the total focal length of the optical system, D is the front full aperture of the optical system, and FOV is the full field of view of the optical system.

9. A full-glass looped see-around-the-clock day-and-night confocal optical system according to any one of claims 1-3, characterized in that, The optical system satisfies the following relationship: 0.1mm -1 <D / TTL / H<0.2 mm -1 ; Wherein, H is the full image height of the optical system, D is the front full aperture of the optical system, and TTL is the total length of the optical system.

10. An image capturing module comprising at least an optical lens, characterized in that, The optical lens is internally mounted with a full-glass ring view day and night confocal optical system according to any one of claims 1-9.

Images