Full-glass vehicle-mounted day and night confocal optical system and camera module applied by same

Abstract

The utility model provides an all-glass vehicle-mounted day and night confocal optical system and a camera module applying the same, mainly comprising eight 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, the object side surface is a concave surface, and the image side surface is a convex surface. The third lens has positive focal power, the object side surface is a convex surface, the image side surface is a concave surface, the fourth lens has negative focal power, the object side surface is a convex surface, the image side surface is a concave surface, the fifth lens has positive focal power, the object side surface is a convex surface, the image side surface is a convex surface, and the fourth lens and the fifth lens form a bonding lens. The sixth lens has positive focal power, the object side face of the sixth lens is a convex face, the image side face of the sixth lens is a convex face, the seventh lens has negative focal power, the image side face of the seventh lens is a concave face, the eighth lens has focal power, and the image side face of the eighth lens is a concave face. And the picture illumination uniformity and the imaging definition are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging, in particular to a full-glass vehicle-mounted day and night confocal optical system and an application camera module thereof. BACKGROUND

[0002] In recent years, intelligent driving technology has been developing, and vehicle-mounted applications have been emerging. As a core key component of the intelligent driving system, the vehicle-mounted lens is related to the safety of the vehicle using the intelligent driving system. With the increasing demand for lens imaging quality, small-aperture lenses cannot fully meet the shooting needs in low-illumination environments, and large-aperture has become a trend in photographic lens products. At present, a series of large-aperture lenses have appeared on the market, but there are few large-aperture medium and long focal length lenses, and even fewer lenses that can simultaneously meet the requirements of large-aperture and infrared confocal. In view of this, it is urgent to design a medium and long focal length lens that can simultaneously meet the requirements of large-aperture and infrared confocal to meet market demand. CONTENT OF THE INVENTION

[0003] The present application aims to provide a full-glass vehicle-mounted day and night confocal optical system, which has the advantages of high pixel and high resolution design, compact structure, easy processing and installation, and further improves the imaging effect of the equipment equipped with the system.

[0004] A full-glass vehicle-mounted day and night confocal optical system includes 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 plane to the image plane.

[0005] The first lens has negative focal power, the object side surface is convex, and the image side surface is concave.

[0006] The second lens has negative focal power, the object side surface is concave, and the image side surface is convex.

[0007] The third lens has positive focal power, the object side surface is convex, and the image side surface is concave.

[0008] The fourth lens has negative focal power, the object side surface is convex, and the image side surface is concave.

[0009] The fifth lens has positive focal power, the object side surface is convex, and the image side surface is convex.

[0010] The fourth lens and the fifth lens constitute a bonded lens.

[0011] The sixth lens has positive focal power, the object side surface is convex, and the image side surface is convex.

[0012] The seventh lens has negative focal power, and the image side surface is concave.

[0013] The eighth lens has a power, and an image-side surface thereof is concave.

[0014] The all-glass vehicle-mounted day and night confocal optical system as described above, the total field angle FOV of the optical system is in [100°, 200°], and the total length TTL of the optical system is less than or equal to 30 mm.

[0015] The all-glass vehicle-mounted day and night confocal optical system as described above, the optical system satisfies the following relationship: D1 / (Fno*Ymax)<1.0; wherein D1 is the maximum effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

[0016] The all-glass vehicle-mounted day and night confocal optical system as described above, the optical system satisfies the following relationship: -12.5mm

[0017] The all-glass vehicle-mounted day and night confocal optical system as described above, the optical system satisfies the following relationship: -5.0

[0018] The all-glass vehicle-mounted day and night confocal optical system as described above, the optical system satisfies the following relationship: -5.0

[0019] The all-glass vehicle-mounted day and night confocal optical system as described above satisfies the following relationship: 0.1 < R1 / f < 12; wherein R1 is the object side curvature of the first lens, and f is the total focal length of the optical system.

[0020] The all-glass vehicle-mounted day and night confocal optical system as described above satisfies the following relationship: Nd3 < 1.95; wherein Nd3 is the refractive index of the third lens material.

[0021] The all-glass vehicle-mounted day and night confocal optical system as described above satisfies the following relationship: H / f < 1.5; wherein H is the image height of the optical system, and f is the total focal length of the optical system.

[0022] The all-glass vehicle-mounted day and night confocal optical system as described above satisfies the following relationship: TTL / f < 5;

[0023] Wherein, f is the total focal length of the optical system, and TTL is the total optical length of the optical system.

[0024] The all-glass vehicle-mounted day and night confocal optical system as described above, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are spherical lenses, and the diaphragm is located between the third lens and the fourth lens.

[0025] In another aspect, the embodiment of the present application also provides a camera module, which at least comprises an optical lens, and the optical lens is internally mounted with the all-glass vehicle-mounted day and night confocal optical system.

[0026] Compared with the prior art, the beneficial effects of the present application are as follows:

[0027] The utility model provides a kind of all-glass vehicle-mounted day and night confocal optical system and the camera module of application thereof, mainly by 8 lenses, it is simple in structure, with high resolving power, large target face, small volume, relative luminance is high and high pixel imaging etc., improve the degree of picture illumination uniformity and imaging definition, and the head size of lens is smaller, can be photographed wider field of view, reduce the production cost of day and night confocal vehicle-mounted lens. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description.

[0029] Figure 1 It is the structure schematic diagram of optical system or camera module of the embodiment 1 of the present application;

[0030] Figure 2 It is the field curvature curve and distortion curve of the optical system or camera module of the embodiment 1 of the present application;

[0031] Figure 3 is a structural schematic diagram of the optical system or camera module of embodiment 2 of the present application;

[0032] Figure 4 is a field curvature curve and distortion curve of the optical system or camera module of embodiment 2 of the present application;

[0033] Figure 5 is a structural schematic diagram of the optical system or camera module of embodiment 3 of the present application;

[0034] Figure 6 is a field curvature curve and distortion curve of the optical system or camera module of embodiment 3 of the present application. DETAILED DESCRIPTION

[0035] As shown in Figures 1-6 The present application provides a full-glass vehicle day and night confocal optical system, which comprises 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 plane to the image plane; the first lens has negative focal power, the object side is convex, and the image side is concave; the second lens has negative focal power, the object side is concave, and the image side is convex; the third lens has positive focal power, the object side is convex, and the image side is concave; the fourth lens has negative focal power, the object side is convex, and the image side is concave; the fifth lens has positive focal power, the object side is convex, and the image side is convex; the fourth lens and the fifth lens constitute a bonded lens; the sixth lens has positive focal power, the object side is convex, and the image side is convex; the seventh lens has negative focal power, and the image side is concave; the eighth lens has focal power, and the image side is concave.

[0036] The utility model provides a kind of full-glass vehicle day and night confocal optical system and its application camera module, mainly by 8 lenses, it is simple in structure, with high resolving power, large target face, small volume, relative luminance is high and high pixel imaging etc.

[0037] Further, the optical system satisfies the following relationship: FOV ∈ [100°, 200°], wherein FOV is the maximum field of view of the optical system, and the design of the large field of view of the optical system effectively meets the actual needs of the large field of view of the optical system.

[0038] Furthermore, the optical system satisfies the following relationship: D1 / (Fno*Ymax) < 1.0, where D1 is the maximum effective optical diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system. The limitation of the maximum image circle and aperture size of the optical imaging system can achieve the purpose of limiting the effective optical diameter of the first lens, and thus ensure the miniaturization requirements of the optical system.

[0039] Furthermore, the optical system satisfies the following relationships: -12.5 mm < f1 < -5.0 mm; -50.0 mm < f2 < -25.0 mm; 5.0 mm < f3 < 35.0 mm; -20.0 mm < f4 < -5.0 mm; 2.0 mm < f5 < 15.0 mm; 5.0 mm < f6 < 15.0 mm; -5.0 mm < f7 < -5.0 mm; -95.0 mm < f8 < 30.0 mm; where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens. The reasonable control of the effective focal lengths of each lens in the optical system can enable the optical system to satisfy a large field angle while limiting the effective diameter of the components, controlling the overall size of the optical system, and adjusting the light incident angle, which is beneficial to correcting the system aberration.

[0040] Furthermore, the optical system satisfies the following relationships: -5.0 < f1 / f < -1.0; -10.0 < f2 / f < -3.0; 1.0 < f3 / f < 5.0; -3.0 < f4 / f < -1.0; 0.5 < f5 / f < 1.5; 1.0 < f6 / f < 3.0; -3.0 < f7 / f < -0.5; -20.0 < f8 / f < 10.0; where f is the focal length of the entire optical system, where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens. The limitation of the ratio of the effective focal lengths of each lens to the effective focal length of the optical system enables the optical system to obtain a reasonable light deflection angle, effectively reducing the sensitivity of component tolerances and improving the system aberration.

[0041] Furthermore, the optical system satisfies the following relationships: -5.0 < R3 / f < -0.01; 0.1 < R1 / f < 12; where R3 is the object-side curvature of the second lens, R1 is the object-side curvature of the first lens, and f is the total focal length of the optical system. By controlling the curvatures of the object sides of the first lens and the second lens, the distortion of the entire optical imaging lens within a small angle range can be significantly increased to meet the special distortion requirements of the vehicle-mounted imaging system.

[0042] Furthermore, the optical system satisfies the following relationship: Nd3 < 1.95; where Nd3 is the refractive index of the third lens material; the reasonable selection of the lens material refractive index helps to make the light rays smoother, effectively reducing the primary aberration and various higher-order aberrations generated by the optical system, which is beneficial to achieving high resolution.

[0043] Furthermore, the optical system satisfies the following relationship: H / f < 1.5; where H is the image height of the optical system and f is the total focal length of the optical system. By controlling the focal length and image height of the optical system within a certain range, it is beneficial to improve the resolution of the entire optical imaging system and achieve high resolution.

[0044] Furthermore, the optical system satisfies the following relationship: TTL / f < 5; where TTL is the total optical length of the optical system and f is the total focal length of the optical system. The limitation of the ratio of the total optical length of the optical system to the effective focal length of the optical system can effectively limit the length of the lens under the condition of a fixed focal length.

[0045] Embodiment 1

[0046] The following refers to Figures 1 to 2 Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 The structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application is shown.

[0047] As Figure 1 shown, the optical imaging lens according to the exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: the first lens E1, the second lens E2, the third lens E3, STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, and the imaging surface S19.

[0048] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative optical power, with its object-side surface S8 being convex and its image-side surface S9 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens E8 has positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0049] Table 1 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 1, wherein the units for radius of curvature and thickness are millimeters (mm).

[0050] Table 1

[0051]

[0052] In Table 1, the object-side surface and image-side surface of the sixth lens E6 and the eighth lens E8 are both aspherical. The surface shape of their aspherical lenses can be defined using, but is not limited to, the following aspherical formula:

[0053]

[0054] 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, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 2 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the first embodiment.

[0055] Table 2

[0056]

[0057] Figure 2 The field curvature and distortion curves of the optical imaging lens of Example 1 are shown. The optical imaging lens given in Example 1 can achieve good imaging quality.

[0058] Example 2

[0059] The following is for reference Figures 3 to 4Describes an optical imaging lens according to Embodiment 2 of this application. Figure 3 A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown.

[0060] like Figure 3 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S19.

[0061] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being concave. The fourth lens E4 has negative optical power, with its object-side surface S8 being convex and its image-side surface S9 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0062] Table 3 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 2, wherein the units for radius of curvature and thickness are millimeters (mm).

[0063] Table 3

[0064]

[0065] In Table 3, the object-side surface and image-side surface of the sixth lens E6 and the eighth lens E8 are both aspherical. The surface shape of their aspherical lenses can be defined using, but is not limited to, the following aspherical formulas:

[0066]

[0067] 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, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 4 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the second embodiment.

[0068] Table 4

[0069]

[0070] Figure 4 The field curvature and distortion curves of the optical imaging lens of Example 2 are shown. The optical imaging lens given in Example 2 can achieve good imaging quality.

[0071] Example 3

[0072] The following is for reference Figures 5 to 6 Describes an optical imaging lens according to Embodiment 3 of this application. Figure 5 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown.

[0073] like Figure 5 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and an imaging plane S19.

[0074] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative optical power, with its object-side surface S8 being convex and its image-side surface S9 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes sequentially through each surface S1 to S18 and is finally imaged onto the imaging surface S19.

[0075] Table 5 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 3, wherein the units for radius of curvature and thickness are millimeters (mm).

[0076] Table 5

[0077]

[0078] In Table 5, the object-side surface and image-side surface of the sixth lens E6 and the eighth lens E8 are both aspherical. The surface shape of their aspherical lenses can be defined using, but is not limited to, the following aspherical formula:

[0079]

[0080] 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, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 6 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface in the third embodiment.

[0081] Table 6

[0082]

[0083] In Examples 1-3, the basic data is as follows:

[0084] Table 7

[0085]

[0086] In Examples 1-3, each conditional expression satisfies the conditions in the table below:

[0087] Table 8

[0088]

[0089] A camera module includes at least an optical lens, in which the aforementioned all-glass vehicle-mounted day and night confocal optical system is installed. It has a simple structure and advantages such as high resolution, large target surface, small size, high relative illumination and high pixel imaging, which improves the uniformity of illumination and image clarity. In addition, the lens head is smaller, which allows for a wider field of view and reduces the production cost of the day and night confocal vehicle-mounted lens.

[0090] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the protection scope of this utility model.

Claims

1. An all-glass vehicle-mounted day-night confocal optical system, comprising 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 plane to the image plane, characterized in that: The first lens has negative optical power, its object side is convex, and its image side is concave. The second lens has negative optical power, its object side is concave, and its image side is convex. The third lens has positive optical power, its object side is convex, and its image side is concave. The fourth lens has negative optical power, its object side is convex, and its image side is concave. The fifth lens has positive optical power, and its object side is convex, as is its image side. The fourth lens and the fifth lens constitute an adhesive lens; The sixth lens has positive optical power, and its object side is convex, and its image side is convex. The seventh lens has negative optical power and its image-side surface is concave. The eighth lens has optical power and its image-side surface is concave.

2. The all-glass vehicle-mounted day and night confocal optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: -12.5mm < f1 < -5.0mm; -50.0mm < f2 < -25.0mm; 5.0mm < f3 < 35.0mm; -20.0mm < f4 < -5.0mm; 2.0mm < f5 < 15.0mm; 5.0mm < f6 < 15.0mm; -5.0mm < f7 < -5.0mm; -95.0mm < f8 < 30.0mm; Where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

3. The all-glass vehicle-mounted day and night confocal optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: -5.0 < f1 / f < -1.0; -10.0 < f2 / f < -3.0; 1.0 < f3 / f < 5.0; -3.0 < f4 / f < -1.0; 0.5 < f5 / f < 1.5; 1.0 < f6 / f < 3.0; -3.0 < f7 / f < -0.5; -20.0 < f8 / f < 10.0; Where f is the focal length of the entire optical system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

4. The all-glass vehicle-mounted day and night confocal optical system according to any one of claims 1-3, characterized in that: The optical system has a full field of view (FOV) of [100°, 200°] and a total length (TTL) of ≤30 mm.

5. The all-glass vehicle-mounted day and night confocal optical system according to any one of claims 1-3, characterized in that: The optical system satisfies the following relationship: D1 / (Fno*Ymax) <1.0; Where D1 is the maximum effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

6. The all-glass vehicle-mounted day and night confocal optical system according to any one of claims 1-3, characterized in that: The optical system satisfies the following relationship: -5.0 < R3 / f < -0.01; and / or 0.1 < R1 / f < 12; wherein, R3 is the object-side curvature of the second lens, R1 is the object-side curvature of the first lens, and f is the total focal length of the optical system.

7. The all-glass vehicle-mounted day and night confocal optical system according to any one of claims 1-3, characterized in that: The optical system satisfies the following relationship: Nd3 < 1.95; wherein, Nd3 is the refractive index of the third lens material.

8. The all-glass vehicle-mounted day and night confocal optical system according to any one of claims 1-3, characterized in that: The optical system satisfies the following relationship: H / f < 1.5; and / or TTL / f < 5.0; wherein, H is the image height of the optical system, f is the total focal length of the optical system, and TTL is the overall optical length of the optical system.

9. The all-glass vehicle-mounted day and night confocal optical system according to any one of claims 1-3, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are spherical lenses, and the aperture stop is located between the third lens and the fourth lens.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the all-glass vehicle-mounted day and night confocal optical system according to any one of claims 1-9.

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