Imaging lens system and camera module, imaging device, in-vehicle system, mobile device equipped therewith

Abstract

This invention provides an imaging lens system with a wide field of view, high brightness, and high resolution. [Solution] The lens is composed of, in order from the object side toward the image side, a first meniscus-shaped lens having negative power with the object side facing convex toward the object side, a second meniscus-shaped lens having negative power with the object side facing concave toward the object side, an aperture, a third lens having positive power with the object side facing convex toward the object side and the image side facing convex toward the image side, a fourth meniscus-shaped lens having negative power with the object side facing convex toward the object side, a fifth meniscus-shaped lens having positive power with the object side facing convex toward the object side, and a sixth lens having positive power with the object side facing convex toward the object side.

Description

Technical Field

[0001] The present invention relates to an imaging lens system, a camera module including the same, an imaging device, an in-vehicle system, and a moving body.

Background Art

[0002] In recent years, for imaging lens systems for in-vehicle use, lenses capable of covering a wide viewing angle have been required. Imaging lens systems for in-vehicle use are used in in-vehicle cameras, and for example, are used for view applications such as front, back, and side views and sensing applications in order to ensure safety when driving an automobile. The imaging lens system of an in-vehicle camera is required to be an imaging lens system having an extremely wide viewing angle and higher resolution and brightness. Patent Document 1 describes an imaging lens system in an in-vehicle camera.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present invention has been made in view of the above, and provides an imaging lens system having a wide angle of view, high resolution, and brightness.

Means for Solving the Problems

[0005] The system consists of, in order from the object side toward the image side, a first meniscus-shaped lens with negative power where the object side faces convex toward the object side; a second meniscus-shaped lens with negative power where the object side faces concave toward the object side; an aperture; a third lens with positive power where the object side faces convex toward the object side and the image side faces convex toward the image side; a fourth meniscus-shaped lens with negative power where the object side faces convex toward the object side; a fifth meniscus-shaped lens with positive power where the object side faces convex toward the object side; and a sixth lens with positive power where the object side faces convex toward the object side. [Effects of the Invention]

[0006] This invention can provide an imaging lens system with a wide field of view, high brightness, and high resolution. [Brief explanation of the drawing]

[0007] [Figure 1] This is a cross-sectional view of the imaging lens system according to Example 1. [Figure 2] This is an aberration diagram of the imaging lens system according to Example 1. [Figure 3] This is a cross-sectional view of the imaging lens system according to Example 2. [Figure 4] This is an aberration diagram of the imaging lens system according to Example 2. [Figure 5] This is a cross-sectional view of the imaging lens system according to Example 3. [Figure 6] This is an aberration diagram of the imaging lens system according to Example 3. [Figure 7] This is a cross-sectional view of the imaging lens system according to Example 4. [Figure 8] This is an aberration diagram of the imaging lens system according to Example 4. [Figure 9] This is a cross-sectional view of the imaging lens system according to Example 5. [Figure 10] This is an aberration diagram of the imaging lens system according to Example 5. [Figure 11] This is a cross-sectional view of the imaging lens system according to Example 6. [Figure 12] This is an aberration diagram of the imaging lens system according to Example 6. [Figure 13] This is a diagram illustrating the configuration of an imaging device equipped with an imaging lens system. [Figure 14] This is a schematic diagram of a vehicle equipped with an imaging device. [Figure 15] This is a diagram showing the configuration of a vehicle equipped with an imaging device. [Modes for carrying out the invention]

[0008] Embodiments of the present invention will be described below with reference to the drawings and other figures. In the drawings and descriptions of this embodiment, functionally identical elements may be indicated by the same number. The following description shows embodiments in accordance with the principle, but these are for the purpose of understanding this embodiment and are not to be used to interpret this embodiment restrictively. The description of this embodiment is merely a typical example and does not limit the scope of the claims or applications in any way.

[0009] Although this embodiment has been described in sufficient detail for those skilled in the art to implement, it is important to understand that other forms are possible, and that the configuration and structure can be modified and various elements replaced without departing from the scope and spirit of the technical idea. Therefore, the following description should not be interpreted as limiting.

[0010] Furthermore, this embodiment can realize a highly reliable system, particularly in sensing systems, and aims to build resilient infrastructure, promote inclusive and sustainable industrialization, and drive innovation. It targets "9.1 Build quality, reliable, sustainable and resilient infrastructure, including local and transboundary infrastructure, to support economic development and human well-being, with a focus on affordable and equitable access for all," one of the United Nations' Sustainable Development Goals (SDGs). [Embodiment 1] Hereinafter, based on the embodiments of the present invention, the imaging lens system according to the present invention, a camera module, an imaging device, an in-vehicle system, and a moving body including the same will be described in detail with reference to the drawings.

[0011] FIG. 1 is an example of the first embodiment and also relates to Example 1 based on specific numerical values. Before explaining the example including specific numerical values, first, the principle embodiment of the present invention will be explained.

[0012] The imaging lens system includes, in order from the object side to the image side, a meniscus-shaped first lens L1 having a negative power with the object-side surface facing a convex surface toward the object side, a meniscus-shaped second lens L2 having a negative power with the object-side surface facing a concave surface toward the object side, an optical aperture 1 (STOP), a third lens L3 having a positive power with the object-side surface facing a convex surface toward the object side and the image-side surface facing a convex surface toward the image side, a meniscus-shaped fourth lens L4 having a negative power with the object-side surface facing a convex surface toward the object side, a meniscus-shaped fifth lens L5 having a positive power with the object-side surface facing a convex surface toward the object side, and a sixth lens L6 having a positive power with the object-side surface facing a convex surface toward the object side. With such a configuration, an imaging lens system having a wide angle of view and high resolution when bright can be obtained.

[0013] The imaging lens system 11 satisfies the following conditional expression (1) when the focal length of the fourth lens L4 is F4 and the focal length of the entire optical system is F. 5 < |F4 / F| < 50 ···(1) By satisfying the conditional expression (1), the imaging lens system 11 can obtain high resolution even when the angle of view is wide and the effective aperture (entrance pupil diameter) is large at a bright F value.

[0014] The imaging lens system 11 satisfies the following conditional expression (2) when the focal length of the fifth lens L5 is F5 and the focal length of the entire optical system is F. 3 < F5 / F < 8 ···(2) By satisfying the conditional expression (2), the imaging lens system 11 can obtain high resolution even when the angle of view is wide and the effective aperture (entrance pupil diameter) is large at a bright F value.

[0015] The imaging lens system 11 satisfies the following condition (3) when the focal length of the fourth lens L4 is F4 and the focal length of the fifth lens L5 is F5. 1.3<|F4 / F5|<7.0 ···(3) By satisfying condition (3), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0016] The imaging lens system 11 satisfies the following condition (4) when the combined focal length of the third lens L3 and the fourth lens L4 is F3F4 and the focal length of the entire optical system is F. 1.5 < |F3F4| / F < 2.5 ... (4) By satisfying condition (4), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0017] The imaging lens system 11 satisfies the following condition (5) when the radius of curvature R of the object-side lens surface S3 of the second lens L2 is L2R1 and the radius of curvature R of the image-side lens surface S4 of the second lens L2 is L2R2. 3.0<-(L2R1+L2R2) / (L2R1-L2R2)<7.5 (5) By satisfying condition (5), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0018] The imaging lens system 11 satisfies the following condition (6) when the radius of curvature R of the object-side lens surface S8 of the fourth lens L4 is L4R1 and the radius of curvature R of the image-side lens surface S9 of the fourth lens L4 is L4R2. -15<-(L4R1+L4R2) / (L4R1-L4R2)<-4...(6) By satisfying condition (6), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0019] The imaging lens system 11 satisfies the following condition (7) when the radius of curvature R of the object-side lens surface S10 of the fifth lens L5 is L5R1 and the radius of curvature R of the image-side lens surface S11 of the fifth lens L5 is L5R2. 2.0<-(L5R1+L5R2) / (L5R1-L5R2)<4.5 (7) By satisfying condition (7), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0020] The imaging lens system 11 satisfies the following condition (8) when the combined focal length of the front group lenses, the first lens L1 and the second lens L2, is FGF, and the focal length of the entire optical system is F. 1.0 < |FGF / F| < 1.4 ... (8) By satisfying condition (8), the imaging lens system 11 can achieve a compact size and high resolution even when the angle of view is wide and the f-number is bright.

[0021] The imaging lens system 11 satisfies the following condition (9) when the combined focal length of the rear group lenses from the third lens L3 to the sixth lens L6 is RGF and the focal length of the entire optical system is F. 1.0 < |RGF / F| < 2.0 ... (9) By satisfying condition (9), the imaging lens system 11 can achieve a compact size and high resolution even when the angle of view is wide and the f-number is bright.

[0022] The imaging lens system 11 satisfies the following condition (10) when the combined focal length of the front group lenses, the first lens L1 and the second lens L2, is FGF, and the combined focal length of the rear group lenses, the third lens L3 to the sixth lens L6, is RGF. 0.5 < |FGF / RGF| < 1.0 ···(10) By satisfying condition (10), the imaging lens system 11 can achieve a compact size and high resolution even when the angle of view is wide and the f-number is bright.

[0023] The imaging lens system 11 satisfies the following condition (11) when the distance D between the image-side lens surface S9 of the fourth lens L4 and the object-side lens surface S10 of the fifth lens L5 is L4L5D, and the distance D between the image-side lens surface S11 of the fifth lens L5 and the object-side lens surface S12 of the sixth lens L6 is L5L6D. 0.65<(L5L6D) / (L4L5D)<5.00 ···(11) By satisfying condition (11), the imaging lens system 11 can achieve a compact size and high resolution even when the angle of view is wide and the f-number is bright.

[0024] As an embodiment, the imaging lens system 11 of the camera module 10 will be described as an example including specific numerical values.

[0025] [Example 1] Figure 1 is a cross-sectional view showing the lens configuration of the imaging lens system 11 of the camera module 10 of Embodiment 1. As shown in Figure 1, the imaging lens system 11 of Embodiment 1 comprises a lens group consisting of a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, in the order of the optical axis O direction from the object side toward the image side.

[0026] Furthermore, the imaging lens system 11 includes a front lens group that determines the angle of view characteristics, etc., through the first lens L1 and the second lens L2. In addition, the imaging lens system 11 has a front lens group and a rear lens group that contributes to brightness, light-gathering characteristics, etc., through the third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6, flanking the optical aperture 1.

[0027] The first lens L1 has a lens surface S1 which is the object side of a spherical surface with positive curvature and a convex shape towards the object, and a lens surface S2 which is the image side of a spherical surface with positive curvature and a concave shape towards the image. The first lens L1 is a negative lens with a negative power (negative refractive power) that diffuses light rays, and is a meniscus-shaped glass lens with a thicker edge than the center.

[0028] The second lens L2 has an aspherical lens surface S3 with negative curvature and a concave shape on the object side, and an aspherical lens surface S4 with negative curvature and a convex shape on the image side. The second lens L2 is a negative lens with negative power and is a meniscus-shaped plastic lens.

[0029] The optical diaphragm 1 (STOP) has an opening that allows light rays to pass through the optical diaphragm surface S5, and the amount of light taken into the optical system is set by the diameter of the opening. The optical diaphragm 1 is made of a non-transparent material and has a thin shape.

[0030] The third lens L3 has a spherical lens surface S6 with positive curvature that is convex towards the object side, and a spherical lens surface S7 with negative curvature that is convex towards the image side. The third lens L3 is a positive glass lens that has positive power where biconvex light rays converge, and is thicker on the center side than on the edge side of the lens.

[0031] The fourth lens L4 has an aspherical lens surface S8 with positive curvature and a convex shape on the object side, and an aspherical lens surface S9 with positive curvature and a concave shape on the image side. The fourth lens L4 is a negative lens with negative power and is a meniscus-shaped plastic lens.

[0032] The fifth lens L5 has an aspherical lens surface S10 with positive curvature and a convex shape on the object side, and an aspherical lens surface S11 with positive curvature and a concave shape on the image side. The fifth lens L5 is a positive lens with positive power and is a meniscus-shaped plastic lens.

[0033] The sixth lens L6 has an aspherical lens surface S12 with positive curvature and a convex shape on the object side, and an aspherical lens surface S13 with positive curvature and a concave shape on the image side. The sixth lens L6 is a positive plastic lens with positive power.

[0034] The first lens L1 and the third lens L3 are glass lenses with excellent heat resistance and weather resistance, and can withstand natural outdoor environments such as sunlight, temperature, humidity, and rain, suppressing focus fluctuations due to changes in ambient temperature. The lens surface S1 of the first lens L1 may be coated with a water-repellent or water-resistant coating.

[0035] Furthermore, the second lens L2, fourth lens L4, fifth lens L5, and sixth lens L6 are made of plastic to achieve weight reduction, cost reduction, and impact resistance. At least one of the second lens L2, fourth lens L4, fifth lens L5, and sixth lens L6 may be a plastic lens. This allows the imaging lens system 11 to correct aberrations and suppress focus shifts at high and low temperatures, for example.

[0036] Furthermore, each lens surface of the first lens L1 to the sixth lens L6 may have a curved surface at least on the side passing through the optical axis O, similar to the lens surface S2 of the first lens L1, and its edges may be flat.

[0037] The bandpass filter 14 (BPF) of the camera module 10 is a filter that allows only light rays of a predetermined wavelength to pass through. For example, the bandpass filter 14 transmits light rays in the range of 850 nm to 940 nm. The bandpass filter 14 has a BPF surface S14 and a BPF surface S15.

[0038] The cover glass 13 (CG) is a glass plate for protecting the image sensor 12. The cover glass 13 has a CG surface S16 and a CG surface S17. The image sensor 12 (IMG) is an element that captures light rays (images) and has an imaging surface S18.

[0039] Thus, the camera module 10 comprises an imaging lens system 11, an optical aperture 1, a bandpass filter 14, a cover glass 13, and an image sensor 12, with each edge fixed to the housing of the camera module 10 or the imaging lens system 11 by flanges or the like. The optical aperture 1 is installed integrally with the imaging lens system 11, but it is not an essential component of the imaging lens system 11. The imaging lens system 11 may also be provided with flanges or the like to substitute for the function of an aperture diaphragm and thus serve as the optical aperture 1.

[0040] Furthermore, the optical aperture 1 is installed between the second lens L2 and the third lens L3, but it may also be installed between the third lens L3 and the fourth lens L4, or at any position between the first lens L1 and the sixth lens L6.

[0041] The bandpass filter 14 is located between the sixth lens L6 and the cover glass 13, that is, on the object side of the image sensor 12. The bandpass filter 14 may also be a component other than a filter that has the function of passing only light rays within a predetermined wavelength range, a so-called bandpass function. Furthermore, the camera module 10 does not necessarily need the bandpass filter 14 or the cover glass 13. If the bandpass filter 14 is not used, for example, a bandpass coating may be applied to the surface of one of the lenses to substitute for the bandpass function.

[0042] Table 1 shows the lens data for each lens surface of the imaging lens system 11 in Example 1.

[0043] [Table 1]

[0044] Table 1, the lens data table, shows the paraxial radius of curvature R, interplanar spacing D, refractive index Nd, and Abbe number νd for each surface. The interplanar spacing D(i) is the distance between surfaces S(i) and S(i+1) on the optical axis O. For example, it indicates that the central thickness on the optical axis O, which is the distance between the object-side lens surface S1 and the image-side lens surface S2, is 0.520 mm. Surfaces marked with an asterisk (*) (for example, lens surface S3 of the second lens L2) indicate aspherical lens surfaces. That is, the second lens L2 and lenses L4 through L6 are aspherical lenses. Such aspherical lens surfaces can effectively correct spherical aberration and coma aberration. The aspherical shapes used for the aspherical lens surfaces in Table 1 are represented by Equation 1.

[0045]

number

[0046] Here, Z is the sag amount. c is the reciprocal of the paraxial radius of curvature R, k is the conicity coefficient, and r is the height from the optical axis. A4, A6, A8, A10, A12, A14, and A16 represent the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order aspherical coefficients, respectively.

[0047] Table 2 shows the aspheric coefficients and other parameters used to define the aspherical shape of the lens surface designated as aspherical in Table 1 in the imaging lens system 11 of Example 1.

[0048] [Table 2]

[0049] In Table 2, for example, "3.16975E-02" is "3.16975×10 -2 It means "...".

[0050] Table 3 shows the characteristic values ​​for the imaging lens system 11 of Example 1, as shown in Tables 1 and 2.

[0051] [Table 3]

[0052] In the imaging lens system 11, F represents the focal length of the entire lens system from the first lens L1 to the sixth lens L6. F1 represents the focal length of the first lens L1. F2 represents the focal length of the second lens L2, F3 represents the focal length of the third lens L3, F4 represents the focal length of the fourth lens L4, F5 represents the focal length of the fifth lens L5, and F6 represents the focal length of the sixth lens L6.

[0053] Furthermore, TTL indicates the total optical distance along the optical axis O from the object-side lens surface S1 of the first lens L1 to the object-side imaging surface S18 of the image sensor 12. BFL indicates the air-equivalent distance along the optical axis O from the image-side lens surface S13 of the sixth lens L6 to the imaging surface S18 of the image sensor 12.

[0054] Furthermore, 2ω represents the full horizontal field of view, which is generally an ultra-wide-angle lens of 130° or more. Here, the horizontal field of view is the field of view in which an image can be captured within the longitudinal direction of the image sensor. In Example 1, the full field of view (2ω) is 150°. Also, the light rays represent characteristic values ​​when the wavelengths are 850nm and 940nm.

[0055] At this time, the Fno (F-number) of the imaging lens system 11 is 1.3, ensuring sufficient light and making the imaging lens bright. The imaging lens system 11 corrects various aberrations such as spherical aberration and coma aberration that occur when the optical aperture diameter is increased and a bright optical system (for example, an F-number of 1.3) is created.

[0056] Figure 2(a) shows the spherical aberration of the imaging lens system 11 of Example 1. The horizontal axis in Figure 2(a) represents the distance in the direction of the optical axis O. The vertical axis represents the relative pupil coordinates normalized to the entrance pupil diameter. In addition, the solid line in Figure 2(a) represents the wavelength of light at 940 nm, and the dashed line represents the wavelength of light at 850 nm. Thus, the imaging lens system 11 of Example 1 has little distance deviation in the direction of the optical axis O, and the spherical aberration is corrected to an appropriate range.

[0057] Figure 2(b) shows the astigmatism and field curvature of the imaging lens system 11 of Example 1. In Figure 2(b), the horizontal axis represents the distance in the direction of the optical axis O, and the vertical axis represents the half-angle of view ω. In Figure 2(b), the solid line represents the field curvature in the sagittal plane at a wavelength of 850 nm, and the dashed line represents the field curvature in the tangential plane at a wavelength of 850 nm. Furthermore, the dashed line represents the field curvature in the sagittal plane at a wavelength of 940 nm, and the dotted line represents the field curvature in the tangential plane at a wavelength of 940 nm. Thus, the imaging lens system 11 of Example 1 has little distance deviation in the direction of the optical axis O, and astigmatism and field curvature are corrected to an appropriate range. In this way, the imaging lens system 11 can obtain high resolution even with a wide angle of view and a bright F-number.

[0058] [Example 2] Figure 3 is a cross-sectional view showing the configuration of the imaging lens system 11 of the camera module 10 in Example 2. The configuration of the imaging lens system 11 in Example 2 is the same as that of Example 1, so its explanation is omitted. Similarly, the configuration of the camera module 10 in Example 2 is the same as that of Example 1, so its explanation is omitted. This Example 2 differs from Example 1 in lens data, etc., as follows.

[0059] Table 4 shows the lens data for each lens surface of the imaging lens system 11 in Example 2. The lens data in Table 4 shows data for the same items as in Table 1.

[0060] [Table 4]

[0061] Table 5 shows the aspheric coefficients and other parameters used to define the aspherical shape of the aspherical lens surface in the imaging lens system 11 of Example 2. Table 5 shows the same values ​​for the same items as in Table 2.

[0062] [Table 5]

[0063] Table 6 shows the characteristic values ​​for the imaging lens system 11 of Example 2, as shown in Tables 4 and 5, etc., for the same items as shown in Table 3, which shows the characteristic values ​​for Example 1. Note that the F-number of the camera module 10 in this case is a bright 1.3, and the total angle of view is 150°, making it an ultra-wide-angle lens.

[0064] [Table 6]

[0065] Figure 4(a) shows the spherical aberration of the imaging lens system 11 of Example 2, and Figure 4(b) shows the astigmatism and field curvature of the imaging lens system 11 of Example 2. Since Figures 4(a) and 4(b) show graphs for the same items as Figures 2(a) and 2(b), the explanation for each aberration diagram is the same and will be omitted. The imaging lens system 11 can obtain high resolution even with a wide angle of view and a bright F-number.

[0066] [Example 3] Figure 5 is a cross-sectional view showing the configuration of the imaging lens system 11 of the camera module 10 in Example 3. The configuration of the imaging lens system 11 in Example 3 is the same as that of Example 1, so its explanation is omitted. Similarly, the configuration of the camera module 10 in Example 3 is the same as that of Example 1, so its explanation is omitted. This Example 3 differs from Example 1 in the following ways regarding lens data, etc.

[0067] Table 7 shows the lens data for each lens surface of the imaging lens system 11 in Example 3. The lens data in Table 7 shows data for the same items as in Table 1.

[0068] [Table 7]

[0069] Table 8 shows the aspheric coefficients and other parameters used to define the aspherical shape of the aspherical lens surface in the imaging lens system 11 of Example 3. Table 8 shows the same values ​​for the same items as in Table 2.

[0070] [Table 8]

[0071] Table 9 shows the characteristic values ​​for the imaging lens system 11 of Example 3, as shown in Tables 7 and 8, etc., for the same items as shown in Table 3, which shows the characteristic values ​​for Example 1. Note that the F-number of the camera module 10 in this case is a bright 1.3, and the total angle of view is 150°, making it an ultra-wide-angle lens.

[0072] [Table 9]

[0073] Figure 6(a) shows the spherical aberration of the imaging lens system 11 of Example 3, and Figure 6(b) shows the astigmatism and field curvature of the imaging lens system 11 of Example 3. Since Figures 6(a) and 6(b) show graphs for the same items as Figures 2(a) and 2(b), the explanation for each aberration diagram is the same and will be omitted. The imaging lens system 11 can obtain high resolution even with a wide angle of view and a bright F-number.

[0074] [Example 4] Figure 7 is a cross-sectional view showing the configuration of the imaging lens system 11 of the camera module 10 in Example 4. The configuration of the imaging lens system 11 in Example 4 is the same as that of Example 1, so its explanation is omitted. Similarly, the configuration of the camera module 10 in Example 4 is the same as that of Example 1, so its explanation is omitted. This Example 4 differs from Example 1 in lens data, etc., as follows.

[0075] Table 10 shows the lens data for each lens surface of the imaging lens system 11 in Example 4. The lens data in Table 10 shows data for the same items as in Table 1.

[0076] [Table 10]

[0077] Table 11 shows the aspheric coefficients and other parameters used to define the aspherical shape of the aspherical lens surface in the imaging lens system 11 of Example 4. Table 11 shows the same values ​​for the same items as in Table 2.

[0078] [Table 11]

[0079] Table 12 shows the characteristic values ​​for the imaging lens system 11 of Example 4, as shown in Tables 10 and 11, etc., for the same items as shown in Table 3, which shows the characteristic values ​​for Example 1. Note that the F-number of the camera module 10 in this case is a bright 1.3, and it is an ultra-wide-angle lens with a full field of view of 150°.

[0080] [Table 12]

[0081] Figure 8(a) shows the spherical aberration of the imaging lens system 11 of Example 4, and Figure 8(b) shows the astigmatism and field curvature of the imaging lens system 11 of Example 4. Since Figures 8(a) and 8(b) show graphs for the same items as Figures 2(a) and 2(b), the explanation for each aberration diagram is the same and will be omitted. The imaging lens system 11 can obtain high resolution even with a wide angle of view and a bright F-number.

[0082] [Example 5] Figure 9 is a cross-sectional view showing the configuration of the imaging lens system 11 of the camera module 10 in Example 5. The configuration of the imaging lens system 11 in Example 5 is the same as that of Example 1, so its explanation is omitted. Similarly, the configuration of the camera module 10 in Example 5 is the same as that of Example 1, so its explanation is omitted. This Example 5 differs from Example 1 in lens data, etc., as follows.

[0083] Table 13 shows the lens data for each lens surface of the imaging lens system 11 in Example 5. The lens data in Table 13 shows data for the same items as in Table 1.

[0084] [Table 13]

[0085] Table 14 shows the aspheric coefficients and other parameters used to define the aspherical shape of the aspherical lens surface in the imaging lens system 11 of Example 5. Table 14 shows the same values ​​for the same items as in Table 2.

[0086] [Table 14]

[0087] Table 15 shows the characteristic values ​​for the imaging lens system 11 of Example 5, as shown in Tables 13 and 14, etc., for the same items as shown in Table 3, which shows the characteristic values ​​for Example 1. Note that the F-number of the camera module 10 in this case is a bright 1.3, and the total angle of view is 150°, making it an ultra-wide-angle lens.

[0088] [Table 15]

[0089] Figure 10(a) shows the spherical aberration of the imaging lens system 11 of Example 5, and Figure 10(b) shows the astigmatism and field curvature of the imaging lens system 11 of Example 5. Since Figures 10(a) and 10(b) show graphs for the same items as Figures 2(a) and 2(b), the explanation for each aberration diagram is the same and will be omitted. The imaging lens system 11 can obtain high resolution even with a wide angle of view and a bright F-number.

[0090] [Example 6] Figure 11 is a cross-sectional view showing the configuration of the imaging lens system 11 of the camera module 10 of Embodiment 6. The sixth lens L6 has an aspherical lens surface S12 with positive curvature that is convex towards the object side, and an aspherical lens surface S13 with negative curvature that is convex towards the image side. The sixth lens L6 is a positive plastic lens having positive power.

[0091] The configuration of the imaging lens system 11 in Example 6 is the same as in Example 1, except for the sixth lens L6, so its explanation is omitted. Similarly, the configuration of the camera module 10 in Example 6 is the same as in Example 1, so its explanation is omitted. This Example 6 differs from Example 1 in the following ways regarding lens data, etc.

[0092] Table 16 shows the lens data for each lens surface of the imaging lens system 11 in Example 6. The lens data in Table 16 shows data for the same items as in Table 1.

[0093] [Table 16]

[0094] Table 17 shows the aspheric coefficients and other parameters used to define the aspherical shape of the aspherical lens surface in the imaging lens system 11 of Example 6. Table 17 shows the same values ​​for the same items as in Table 2.

[0095] [Table 17]

[0096] Table 18 shows the characteristic values ​​for the imaging lens system 11 of Example 6, as shown in Tables 16 and 17, etc., for the same items as shown in Table 3, which shows the characteristic values ​​for Example 1. Note that the F-number of the camera module 10 in this case is a bright 1.3, and the total angle of view is 150°, making it an ultra-wide-angle lens.

[0097] [Table 18]

[0098] Figure 12(a) shows the spherical aberration of the imaging lens system 11 of Example 6, and Figure 12(b) shows the astigmatism and field curvature of the imaging lens system 11 of Example 6. Since Figures 12(a) and 12(b) show graphs for the same items as Figures 2(a) and 2(b), the explanation for each aberration diagram is the same and will be omitted. The imaging lens system 11 can obtain high resolution even with a wide angle of view and a bright F-number.

[0099] [Summary of conditional expressions] Table 19 summarizes the main characteristic values ​​and calculated related values ​​of the imaging lens system 11 in Examples 1 to 6.

[0100] [Table 19]

[0101] The imaging lens system 11 satisfies the following condition (1) when the focal length of the fourth lens L4 is F3 and the focal length of the entire optical system is F. 5<|F4 / F|<50 ···(1) By satisfying condition (1), the imaging lens system 11 can achieve high resolution even at bright F-numbers that allow for a wide angle of view and a large effective aperture (pupil diameter).

[0102] When "|F4 / F|" is 5 or less, the negative refractive power increases, making it difficult to correct spherical aberration. Conversely, when "|F4 / F|" is 50 or more, the negative refractive power decreases, making it difficult to correct field curvature. In this way, the imaging lens system 11 corrects spherical aberration and field curvature to an appropriate range. Furthermore, it is even better if the imaging lens system 11 satisfies 7 ≤ "|F4 / F|" ≤ 43.

[0103] The imaging lens system 11 satisfies the following condition (2) when the focal length of the fifth lens L5 is F5 and the focal length of the entire optical system is F. 3 <F5 / F<8 ···(2) By satisfying condition (2), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0104] If "F5 / F" is 3 or less, the positive refractive power becomes large, resulting in excessive correction of spherical aberration, coma aberration, and astigmatism. Conversely, if "F5 / F" is 8 or greater, the positive refractive power becomes small, resulting in insufficient correction of spherical aberration, coma aberration, and astigmatism. Furthermore, it is preferable for the imaging lens system 11 to satisfy 5 ≤ F5 / F ≤ 7.

[0105] The imaging lens system 11 satisfies the following condition (3) when the focal length of the fourth lens L4 is F4 and the focal length of the fifth lens L5 is F5. 1.3<|F4 / F5|<7.0 ···(3) By satisfying condition (3), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0106] If "|F4 / F5|" is 1.3 or less, the refractive power of the fourth lens L4 relative to the fifth lens L5 becomes large, and the spherical aberration and coma aberration generated in the fourth lens L4 cannot be adequately corrected by the fifth lens L5. Also, if "|F4 / F5|" is 7.0 or more, the refractive power of the fourth lens L4 relative to the fifth lens L5 becomes small, and the astigmatism generated in the fourth lens L4 cannot be adequately corrected by the fifth lens L5. Furthermore, it is preferable that the imaging lens system 11 satisfies 1.5 ≤ |F4 / F5| ≤ 6.1.

[0107] The imaging lens system 11 satisfies the following condition (4) when the combined focal length of the third lens L3 and the fourth lens L4 is F3F4 and the focal length of the entire optical system is F. 1.5 < |F3F4| / F < 2.5 ... (4) By satisfying condition (4), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0108] If "|F3F4|" is 1.5 or less, the combined refractive power of the third lens L3 and the fourth lens L4 becomes large, making it difficult to correct spherical aberration. Also, if "|F3F4|" is 2.5 or more, the combined refractive power of the third lens L3 and the fourth lens L4 becomes small, increasing the optical total length TTL and making the device larger. Furthermore, it is preferable for the imaging lens system 11 to satisfy 1.9 ≤ |F3F4| / F ≤ 2.1.

[0109] The imaging lens system 11 satisfies the following condition (5) when the radius of curvature R of the object-side lens surface S3 of the second lens L2 is L2R1 and the radius of curvature R of the image-side lens surface S4 of the second lens L2 is L2R2. 3.0<-(L2R1+L2R2) / (L2R1-L2R2)<7.5 (5) By satisfying condition (5), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0110] If the shape factor of "-(L2R1+L2R2) / (L2R1-L2R2)" is 3 or less, astigmatism will occur significantly and will be difficult to correct. Also, if "-(L2R1+L2R2) / (L2R1-L2R2)" is 7.5 or more, spherical aberration and coma aberration will occur significantly and will be difficult to correct. Furthermore, it is even better if the imaging lens system 11 satisfies 3.9 ≤ -(L2R1+L2R2) / (L2R1-L2R2) ≤ 4.1.

[0111] The imaging lens system 11 satisfies the following condition (6) when the radius of curvature R of the object-side lens surface S8 of the fourth lens L4 is L4R1 and the radius of curvature R of the image-side lens surface S9 of the fourth lens L4 is L4R2. -15<-(L4R1+L4R2) / (L4R1-L4R2)<-4...(6) By satisfying condition (6), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0112] If the shape factor of "-(L4R1+L4R2) / (L4R1-L4R2)" is -15 or less, astigmatism will increase and correction will become difficult. Also, if "-(L4R1+L4R2) / (L4R1-L4R2)" is -4 or more, spherical aberration and coma aberration will increase and correction will become difficult. Furthermore, it is preferable that the imaging lens system 11 satisfies -8 ≤ -(L4R1+L4R2) / (L4R1-L4R2) ≤ -5.

[0113] The imaging lens system 11 satisfies the following condition (6) when the radius of curvature R of the object-side lens surface S10 of the fifth lens L5 is L5R1 and the radius of curvature R of the image-side lens surface S11 of the fifth lens L5 is L5R2. 2.0<-(L5R1+L5R2) / (L5R1-L5R2)<4.5 (7) By satisfying condition (7), the imaging lens system 11 can achieve high resolution even when the angle of view is wide and the F-number is bright.

[0114] If the shape factor of "-(L5R1+L5R2) / (L5R1-L5R2)" is 2 or less, spherical aberration becomes significant and difficult to correct. Also, if "-(L5R1+L5R2) / (L5R1-L5R2)" is 4.5 or more, coma aberration and astigmatism become significant and difficult to correct. Furthermore, it is preferable that the imaging lens system 11 satisfies 3.0 ≤ -(L5R1+L5R2) / (L5R1-L5R2) ≤ 3.6.

[0115] The imaging lens system 11 satisfies the following condition (8) when the combined focal length of the front group lenses, the first lens L1 and the second lens L2, is FGF, and the focal length of the entire optical system is F. 1.0 < |FGF / F| < 1.4 ... (8) By satisfying condition (8), the imaging lens system 11 can achieve a compact size and high resolution even when the angle of view is wide and the f-number is bright.

[0116] If "|FGF / F|" is 1 or less, the refractive power of the front lens group increases, making it difficult to correct distortion. Also, if "|FGF / F|" is 1.4 or more, the refractive power of the front lens group decreases, making it difficult to widen the angle and increasing the diameter of the first lens L1. Furthermore, it is preferable that the imaging lens system 11 satisfies 1.1 ≤ |FGF / F| ≤ 1.3.

[0117] The imaging lens system 11 satisfies the following condition (9) when the combined focal length of the rear group lenses from the third lens L3 to the sixth lens L6 is RGF and the focal length of the entire optical system is F. 1.0 < |RGF / F| < 2.0 ... (9) By satisfying condition (9), the imaging lens system 11 can achieve a compact size and high resolution even when the angle of view is wide and the f-number is bright.

[0118] If "|RGF / F|" is 1 or less, the refractive power of the rear lens group increases, making it difficult to shorten the back focus BFL. If "|RGF / F|" is 2 or more, the refractive power of the rear lens group decreases, increasing the optical total length TTL, making miniaturization difficult. Furthermore, it is preferable that the imaging lens system 11 satisfies 1.4 ≤ |RGF / F| ≤ 1.5.

[0119] The imaging lens system 11 satisfies the following condition (10) when the combined focal length of the front group lenses, the first lens L1 and the second lens L2, is FGF, and the combined focal length of the rear group lenses, the third lens L3 to the sixth lens L6, is RGF. 0.5 < |FGF / RGF| < 1.0 ···(10) By satisfying condition (10), the imaging lens system 11 can achieve a compact size and high resolution even when the angle of view is wide and the f-number is bright.

[0120] If "|FGF / RGF|" is 0.5 or less, the refractive power of the front lens group decreases, making it difficult to correct the distortion aberration generated by the front lens group with the rear lens group. If "|FGF / RGF|" is 1 or more, the refractive power of the rear lens group decreases, increasing the optical total length TTL and making miniaturization difficult. Furthermore, it is preferable that the imaging lens system 11 satisfies 0.77 ≤ |FGF / RGF| ≤ 0.84.

[0121] The imaging lens system 11 satisfies the following condition (11) when the distance D between the image-side lens surface S9 of the fourth lens L4 and the object-side lens surface S10 of the fifth lens L5 is L4L5D, and the distance D between the image-side lens surface S11 of the fifth lens L5 and the object-side lens surface S12 of the sixth lens L6 is L5L6D. 0.65<(L5L6D) / (L4L5D)<5.00 ···(11) By satisfying condition (11), the imaging lens system 11 can achieve a compact size and high resolution even when the angle of view is wide and the f-number is bright.

[0122] If "(L5L6D) / (L4L5D)" is 0.65 or less, the spacing between L4L5D becomes too wide, making it difficult for the fifth lens L5 to correct the spherical aberration generated in the fourth lens L4. If "(L5L6D) / (L4L5D)" is 5.0 or more, the spacing between L5L6D becomes too wide, increasing the height of the off-axis light incident on the sixth lens L6, making it difficult to miniaturize the sixth lens L6. Furthermore, it is preferable for the imaging lens system 11 to satisfy 0.75 ≤ (L5L6D) / (L4L5D) ≤ 1.64.

[0123] [Differentiation] The present invention is not limited to the embodiments described above, and includes various other modifications. For example, the embodiments described above are described in detail to make the present invention easier to understand, and are not necessarily limited to those having all the configurations described.

[0124] Furthermore, it is possible to replace parts of the configuration of one embodiment with parts of the configuration of another embodiment, and it is also possible to add parts of the configuration of another embodiment to the configuration of one embodiment. In addition, it is possible to add, delete, or replace parts of the configuration of each embodiment with parts of other configurations. [Embodiment 2] Figure 13 shows the configuration of an imaging device 50 equipped with the imaging lens system 11 of Embodiment 1. As shown in the figure, the imaging device 50 according to the embodiment includes a camera module 10 that houses the imaging lens system 11 and an image sensor 12 etc. in a housing (not shown), a control unit 52, and a storage unit 54.

[0125] The control unit 52 controls the camera module 10 and processes the electrical signals output from the image sensor 12 of the camera module 10. This control unit 52 may be composed of, for example, a processor unit (PU), RAM, ROM, etc. The control unit 52 may also include one or more processors.

[0126] The processor may include a general-purpose processor that loads a specific program and executes a specific function, and a dedicated processor specialized for a specific process. The dedicated processor may include an application-specific integrated circuit (IC). An application-specific integrated circuit (ASIC) is also called an application-specific integrated circuit (ASIC). The processor may also include a programmable logic device (Programmable Logic Device). A programmable logic device (PLD) is also called a Programmable Logic Device (PLD). A PLD may include a Field-Programmable Gate Array (FPGA). The control unit 52 may be either a System-on-a-Chip (SoC) or a System-in-a-Package (SiP) in which one or more processors cooperate.

[0127] The storage unit 54 stores various information or parameters related to the operation of the imaging device 50. The storage unit 54 may be composed of, for example, a semiconductor memory. The storage unit 54 may function as a work memory for the control unit 52. The storage unit 54 may store captured images. The storage unit 54 may store various information or parameters for the control unit 52 to perform detection processing and control based on the captured images. The storage unit 54 may be included in the control unit 52.

[0128] As mentioned above, the camera module 10 captures an image of a subject (object) formed via the imaging lens system 11 with the image sensor 12 and outputs the captured image. The image captured by the camera module 10 is also called the captured image.

[0129] The image sensor 12 may be composed of, for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor or a CCD (Charge Coupled Device). The image sensor 12, positioned at the focal point of the imaging lens system 11, has an imaging surface in which multiple pixels are arranged. Each pixel outputs a signal that is specified by current or voltage according to the amount of incident light. The signal output by each pixel is also called imaging data.

[0130] The imaging data may be read out by the camera module 10 for all pixels and taken into the control unit 52 as an image. The image obtained by reading out all pixels is also called the maximum image. The imaging data may be read out by the camera module 10 for some pixels and taken into the image. In other words, the imaging data may be read out from pixels within a predetermined acquisition range. The imaging data read out from pixels within a predetermined acquisition range may be taken into the image. The predetermined acquisition range may be set by the control unit 52. The camera module 10 may obtain the predetermined acquisition range from the control unit 52. The image sensor 12 may capture an image within a predetermined acquisition range from the subject image formed via the imaging lens system 11. Alternatively, the imaging device 50 (imaging camera) may be an imaging system in which the camera module 10 is a separate unit connected by cables or the like. [Embodiment 3] Figure 14 is a schematic diagram of a vehicle 40 equipped with an in-vehicle system that includes an imaging device 50 comprising an imaging lens system according to Embodiment 1 or Embodiment 2 and an image sensor that converts the light focused through thereon into an electrical signal.

[0131] As shown in Figure 14, the vehicle 40, which is an automobile that travels day and night, is equipped with tires, steering, etc., for driving. The vehicle 40, being a mobile unit, is equipped with an imaging device 50 that can obtain bright, high-resolution images corresponding to a wide field of view. The vehicle 40 is also equipped with an information processing device 42, a display device 43, etc.

[0132] Figure 14 shows several example arrangements illustrating the mounting positions of the imaging devices 50 in the vehicle 40. For example, the first imaging device 50a, which is one of the imaging devices 50, may be placed on or near the front bumper as a camera to monitor the area in front of the vehicle 40 while it is in motion. The second imaging device 50b, which is another imaging device 50 that monitors the area in front, may be placed near the rearview mirror inside the vehicle 40. The third imaging device 50c may be placed on the dashboard or inside the instrument panel, etc., as a camera to monitor the driver's driving conditions. The fourth imaging device 50d may be installed at the rear of the vehicle 40 for use as a rear monitor.

[0133] The first imaging device 50a and the second imaging device 50b can be called front cameras. The third imaging device 50c can be called an in-camera. The fourth imaging device 50d can be called a rear camera. The imaging device 50 is not limited to these, and can be installed in various positions, such as a left-side camera that images the left rear side and a right-side camera that images the right rear side, and is an imaging device that can provide a wide field of view with few blind spots. In this way, the imaging lens system 11 within the imaging device 50 can be installed in various positions on the vehicle 40.

[0134] Figure 15 is a diagram showing the configuration of a vehicle 40 on which an in-vehicle system 41 is mounted, which includes an imaging device 50 comprising an imaging lens system 11 according to Embodiment 1 or Embodiment 2 and an imaging sensor 12 that converts the light focused through thereon into an electrical signal.

[0135] As shown in Figure 15, the imaging device 50 mounted on the vehicle 40 as an automobile can also be called an on-board camera and can be installed in various locations on the vehicle 40. Furthermore, the on-board system 41 equipped with the imaging device 50 etc. mounted on the vehicle 40 as an automobile is also a mobile system equipped with the imaging device 50 etc. mounted on a mobile body. In other words, the mobile body is not limited to the vehicle 40 as an automobile, but includes, for example, a moving bicycle, motorcycle, wheelchair, train, drone, helicopter, airplane, ship, etc.

[0136] As shown in Figure 15, the image signal of the captured image captured by the imaging device 50 is output to the information processing device 42, display device 43, etc. of the vehicle 40 via a cable or bus, etc. Furthermore, the image signal of the captured image may be output to the information processing device, display device, etc. of the control center via wireless or network, etc. The in-vehicle system 41 comprises at least the information processing device 42 and the imaging device 50. The in-vehicle system 41 may also comprise the information processing device 42, the imaging device 50, and the display device 43, etc.

[0137] The information processing device 42 of the vehicle 40 acquires the captured image output from the camera module 10 of the imaging device 50 and processes the image signal of the captured image. The information processing device 42 may also process the captured images acquired by the first imaging device 50a and the second imaging device 50b, which are imaging devices 50 as shown in Figure 14, by combining them. The information processing device 42 may be composed of, for example, a processor unit (PU), RAM, ROM, etc.

[0138] The information processing device 42 recognizes various objects in the captured image, such as people (including the driver of the vehicle 40 captured by the in-camera), other vehicles, other moving objects, animals, roads, and road signs, and generates recognition information such as images of the objects, their type, location, and speed of movement.

[0139] The captured images may be images of the vehicle 40 in the direction of movement, or one or more images that meet predetermined conditions, for example, one image when the vehicle 40 is traveling at a predetermined speed or higher, and multiple images when it is traveling at a speed lower than that.

[0140] The information processing device 42 includes devices that assist the driver in driving. For example, the information processing device 42 includes, but is not limited to, a navigation device, a collision damage mitigation braking device, a distance control device, and a lane departure warning device.

[0141] The display device 43 displays images and other recognition information processed and output by the information processing device 42 as an output device, but it may also notify audio, which is recognition information corresponding to the images and other recognition information, using an audio output device as an output device.

[0142] Furthermore, the display device 43 may employ, but is not limited to, a liquid crystal display (LCD), an organic electro-luminescence (EL) display, or an inorganic EL display. The display device 43 can also directly receive image signals, such as captured images output from an imaging device 50 that captures images from a position difficult for the driver to see, such as a rear camera, for example, a fourth imaging device 50d, and display the captured images to the driver or other occupants. The display device 43 may also be an output device equipped with an audio output device that outputs sound, etc., based on the image signal.

[0143] It should be noted that the present invention is not limited to the embodiments described above, and can be modified as appropriate without departing from the spirit of the invention. For example, the applications of the imaging lens system 11 of the present invention are not limited to in-vehicle cameras, but can also be used in other applications such as fixed surveillance cameras, digital cameras, and cameras mounted on small electronic devices such as portable mobile phones.

[0144] Furthermore, the present invention includes various embodiments other than those described above. For example, the above-described embodiments are explained in detail to make the present invention easier to understand, and are not necessarily limited to those having all the configurations described.

[0145] Furthermore, the present invention allows for the replacement of parts of the configuration of one embodiment with the configuration of another embodiment, and also allows for the addition of configurations from other embodiments to the configuration of one embodiment. In addition, the present invention allows for the addition, deletion, and replacement of parts of the configuration of each embodiment with other configurations. [Explanation of symbols]

[0146] 1: Optical aperture (STOP), 10: Camera module, 11: Imaging lens system, 12: Image sensor (IMG), 13: Cover glass (CG), 14: Bandpass filter (BPF), 40: Vehicles, 41: In-vehicle systems, 42: Information processing equipment, 43:Display device, 50, 50a, 50b, 50c, 50d: Imaging devices (imaging cameras, in-vehicle cameras) 52: Control unit, 54: Memory section, L1: First lens, L2: Second lens, L3: Third lens, L4: Fourth lens, L5: Fifth lens, L6: 6th lens, S1~S4, S6~S13: Lens surface, S5: Optical aperture surface, S14, S15: BPF surface, S16, S17: CG side S18: Imaging plane.

Claims

1. Starting from the object side and moving towards the image side, A first lens having a meniscus shape with negative power, where the side surface of the object faces the object with a convex side, A second lens with a meniscus shape having negative power with the side of the object facing the object with a concave surface, Aperture and, A third lens having positive power, with the object side facing the object and the image side facing the image, A fourth lens with a meniscus shape having negative power with the side of the object facing the object as a convex surface, A fifth lens with a meniscus shape having positive power with the side of the object facing the object as a convex surface, It consists of a sixth lens having positive power with the side of the object facing the object with a convex surface, Imaging lens system.

2. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (1), where the focal length of the fourth lens is F3 and the focal length of the entire optical system is F. 5<|F4 / F|<50...(1)

3. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (2), where the focal length of the fifth lens is F5 and the focal length of the entire optical system is F. 3<F5 / F<8...(2)

4. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (3) when the focal length of the fourth lens is F4 and the focal length of the fifth lens is F5. 1.3<|F4 / F5|<7.0...(3)

5. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (4), where the combined focal length of the third lens and the fourth lens is F3F4 and the focal length of the entire optical system is F. 1.5<|F3F4| / F<2.5...(4)

6. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (5), where L2R1 is the radius of curvature of the object-side surface of the second lens and L2R2 is the radius of curvature of the image-side surface of the second lens. 3.0<-(L2R1+L2R2) / (L2R1-L2R2)<7.5...(5)

7. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (6), where L4R1 is the radius of curvature of the object-side surface of the fourth lens and L4R2 is the radius of curvature of the image-side surface of the fourth lens. -15<-(L4R1+L4R2) / (L4R1-L4R2)<-4...(6)

8. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (7), where L5R1 is the radius of curvature of the object-side surface of the fifth lens and L5R2 is the radius of curvature of the image-side surface of the fifth lens. 2.0<-(L5R1+L5R2) / (L5R1-L5R2)<4.5...(7)

9. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (8), where FGF is the combined focal length of the front group lenses from the first lens to the second lens, and F is the focal length of the entire optical system. 1.0<|FGF / F|<1.4...(8)

10. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (9), where RGF is the combined focal length of the rear group lenses from the third lens to the sixth lens, and F is the focal length of the entire optical system. 1.0<|RGF / F|<2.0...(9)

11. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (10), where FGF is the combined focal length of the front lens group from the first lens to the second lens, and RGF is the combined focal length of the rear lens group from the third lens to the sixth lens. 0.5<|FGF / RGF|<1.0...(10)

12. In the imaging lens system described in claim 1, An imaging lens system that satisfies the following condition (11) when the distance between the image-side surface of the fourth lens and the object-side surface of the fifth lens is L4L5D, and the distance between the image-side surface of the fifth lens and the object-side surface of the sixth lens is L5L6D. 0.65<(L5L6D) / (L4L5D)<5.00 (11)

13. A camera module comprising: an imaging lens system according to any one of claims 1 to 12; and an image sensor that converts light focused through the imaging lens system into an electrical signal.

14. An imaging device comprising: a camera module according to claim 13; a control unit for controlling the camera module; and a storage unit for storing information for the control unit to perform control.

15. An in-vehicle system comprising a camera module as described in claim 13, and an information processing device that recognizes an object in an image captured by the camera module and generates recognition information.

16. A mobile body comprising: a camera module according to claim 13; an information processing device that recognizes an object in an image captured by the camera module and generates recognition information; and an output device that outputs the recognition information.

Images