Imaging lens assembly, camera module, and imaging device

Abstract

An imaging lens assembly (21) sequentially includes, from an object side, a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), and an eighth lens (L8), and is configured to satisfy: ((m_fL_r3_si) - (m_fL_r2_si)) / 2 x (l_fL_r5_si) x pi > 0.145, Fno < 1.8, and HFOV > 38.5°, where (m_fL_r2_si) is a first direction cosine formed by a first off-axis light ray in an off-axis light ray bundle in a tangential direction, (m_fL_r3_si) is a second direction cosine formed by a second off-axis light ray in the off-axis light ray bundle in the tangential direction, (l_fL_r5_si) is a third direction cosine formed by a third off-axis light ray in the off-axis light ray bundle in a sagittal direction, Fno is an F number, and HFOV is a half field of view.

Description

Technical Field

[0001] This disclosure relates to an imaging lens assembly, a camera module, and an imaging device, and particularly to an imaging lens assembly, camera module, and imaging device that are small in size and have good optical performance. Background Technology

[0002] In recent years, portable imaging devices such as mobile phones and digital cameras have been widely used. With the miniaturization of imaging devices in recent years, the imaging lens assemblies mounted on these devices also need to be reduced in size.

[0003] Imaging devices require imaging components with large apertures (i.e. diameters) capable of capturing brighter images to avoid reduced sensitivity or increased noise in imaging elements due to narrower unit pitch.

[0004] However, if the overall length of the imaging lens assembly with a large aperture is shortened to reduce the size of the imaging lens assembly, the amount of light at the edges (i.e., the amount of light at the edges of the imaging lens assembly) will be reduced.

[0005] Therefore, from the perspective of suppressing the reduction of edge light, it is advisable to improve the conventional imaging lens assembly. Summary of the Invention

[0006] This disclosure aims to solve at least one of the aforementioned technical problems. Therefore, this disclosure provides an imaging lens, a camera module, and an imaging device.

[0007] According to this disclosure, an imaging lens assembly includes, from the object side, the following components in sequence:

[0008] A first lens with positive refractive power and a convex surface facing the object;

[0009] A second lens with negative refractive power;

[0010] A third lens with positive refractive power;

[0011] Fourth lens;

[0012] Fifth lens;

[0013] The sixth lens;

[0014] The seventh lens; and

[0015] An eighth lens with negative refractive power and a concave surface facing the image side, this imaging lens assembly is configured to satisfy:

[0016] ((m_fL_r3_si)-(m_fL_r2_si)) / 2×(l_fL_r5_si)×π>0.145,

[0017] Fno<1.8, and

[0018] HFOV > 38.5°

[0019] Where (m_fL_r2_si) is the first direction cosine formed by the first off-axis ray in the tangential direction, the first off-axis ray is located at the off-axis end in the off-axis ray beam in the tangential direction, and the off-axis ray beam images within the image circle covering the effective pixel area on the imaging surface.

[0020] (m_fL_r3_si) is the second direction cosine formed by the second off-axis ray in the tangential direction, and the second off-axis ray is located at the end of the off-axis ray bundle on the optical axis side in the tangential direction.

[0021] (l_fL_r5_si) is the third off-axis ray cosine formed in the sagittal direction, with the third off-axis ray located at one end of the off-axis ray bundle in the sagittal direction.

[0022] Fno is the F-number, and

[0023] HFOV is a semi-perspective.

[0024] According to this disclosure, a camera module includes:

[0025] Imaging lens assembly; and

[0026] Image sensors, including imaging surfaces.

[0027] According to this disclosure, an imaging device includes:

[0028] Camera module; and

[0029] The housing that contains the camera module. Attached Figure Description

[0030] These and / or other aspects and advantages of the embodiments of this disclosure will become apparent and more readily understood from the following description with reference to the accompanying drawings. In the drawings:

[0031] Figure 1 This is a schematic diagram illustrating a schematic configuration of an imaging device according to the present disclosure;

[0032] Figure 2 This is a schematic diagram illustrating the conditional expressions of a camera module according to this disclosure;

[0033] Figure 3 It is a graph that explains the conditional expressions of a camera module according to this disclosure;

[0034] Figure 4This is a configuration diagram of a camera module based on a first example of this disclosure;

[0035] Figure 5 It is an aberration map of a camera module according to a first example of this disclosure;

[0036] Figure 6 This is a configuration diagram of a camera module based on the second example of this disclosure;

[0037] Figure 7 It is an aberration map of a camera module according to a second example of this disclosure;

[0038] Figure 8 This is a configuration diagram of a camera module based on the third example of this disclosure;

[0039] Figure 9 It is an aberration map of a camera module according to the third example of this disclosure;

[0040] Figure 10 This is a configuration diagram of the camera module according to the fourth example of this disclosure;

[0041] Figure 11 It is an aberration map of a camera module according to the fourth example of this disclosure;

[0042] Figure 12 This is a configuration diagram of the camera module according to the fifth example of this disclosure;

[0043] Figure 13 It is an aberration map of a camera module according to the fifth example of this disclosure;

[0044] Figure 14 This is a configuration diagram of the camera module according to the sixth example of this disclosure;

[0045] Figure 15 It is an aberration map of a camera module according to the sixth example of this disclosure;

[0046] Figure 16 This is a configuration diagram of the camera module according to the seventh example of this disclosure;

[0047] Figure 17 It is an aberration map of a camera module according to the seventh example of this disclosure;

[0048] Figure 18 This is a configuration diagram of the camera module according to the eighth example of this disclosure; and

[0049] Figure 19 It is an aberration map of a camera module according to the eighth example of this disclosure. Detailed Implementation

[0050] Embodiments of this disclosure will be described in detail, and examples of these embodiments will be shown in the accompanying drawings. Identical or similar elements and elements having the same or similar functions throughout the specification are indicated by the same reference numerals. The embodiments described herein with reference to the accompanying drawings are illustrative and intended to illustrate this disclosure, but should not be construed as limiting the scope of this disclosure.

[0051] <Summary of this disclosure>

[0052] First, a summary of this disclosure will be described. For example, the imaging device 1 to which this disclosure is applied is configured as follows: Figure 1 As shown. In Figure 1 In the diagram, the dashed line represents the optical axis of imaging device 1 (the same applies below).

[0053] Figure 1 The imaging device 1 shown includes a camera module 11, a housing 12 that houses the camera module 11, and an image processing unit 13. The camera module 11 includes an imaging lens assembly 21, a filter 22, and an image sensor 23.

[0054] The imaging lens assembly 21 includes, for example, eight lenses and an aperture stop 3. The eight lenses comprise a first lens to an eighth lens arranged sequentially from the object side. The aperture stop 3 is positioned on the object side relative to the image-side surface of the first lens. The imaging lens assembly 21 images incident light from the object side onto an imaging surface S. For example, the eight lenses are held in a lens barrel and configured to move integrally along the optical axis via an autofocusing device such as a stepper motor or voice coil motor. Because the imaging lens assembly 21 contains eight lenses, a large-size image sensor 23 can be effectively used. By using a large image sensor 23, the image quality of the captured image can be improved. Furthermore, by including eight lenses, the imaging lens assembly 21 can effectively correct various aberrations. Since the aperture stop 3 is positioned on the object side relative to the image-side surface of the first lens, the aperture (i.e., diameter) of the imaging lens assembly 21 can be increased without increasing the overall length of the imaging lens assembly 21. By increasing the aperture of the imaging lens assembly 21, light from the object can be effectively captured to obtain a bright image.

[0055] For example, image sensor 23 is a solid-state image sensor, such as CMOS (Complementary Metal Oxide Semiconductor) or CCD (Charge Coupled Device). Image sensor 23 has an imaging surface S, which is the imaging surface of imaging lens assembly 21. Image sensor 23 is mounted on the surface of substrate 24.

[0056] The image sensor 23 receives incident light from the subject (object side) through the imaging lens assembly 21 and the filter 22, performs photoelectric conversion on the incident light, and outputs the image data obtained by photoelectric conversion of the incident light to the subsequent stage.

[0057] Image processing unit 13 is connected to image sensor 23. Image data output from image sensor 23 is input to image processing unit 13. Image processing unit 13 performs noise reduction processing on the input image data. Noise reduction processing may include, for example, increasing the brightness (e.g., brightness value) of image edges and reducing noise displayed at image edges, which is exposed by increasing the brightness of image edges. Image processing unit 13 may be, for example, a processor that reads and executes a program stored in memory. By performing noise reduction processing, the image quality of the captured image can be improved.

[0058] A filter 22 is disposed between the imaging lens assembly 21 and the image sensor 23. The filter 22 may be, for example, an infrared cut-off filter (IRCF), which blocks infrared light from the light incident from the imaging lens assembly 21.

[0059] The first lens may have positive refractive power and a convex surface facing the object side. The second lens may have negative refractive power. The third lens may have positive refractive power. The eighth lens may have negative refractive power and a concave surface facing the image side. By combining these refractive powers, the imaging lens assembly 21 can further and more effectively correct various aberrations.

[0060] The eighth lens, positioned on the imaging side, can have an aspherical shape with an inflection point. When the eighth lens has an aspherical shape with an inflection point, the back focal length of the imaging lens assembly 21 can be shortened. By shortening the back focal length, the overall length of the imaging lens assembly 21 can be shortened. To shorten the back focal length, it is preferable that the image-side surface of the eighth lens has an aspherical shape with an inflection point.

[0061] Considering the lens forming process, it is preferable that the aspherical lenses constituting the imaging lens assembly 21, particularly aspherical lenses with inflection points, are made of plastic material. Furthermore, among the lenses constituting the imaging lens assembly 21, lenses with dimensions equal to or smaller than a specific size can be made of plastic material, while lenses larger than a specific size can be made of glass material. This is because it is difficult to manufacture aspherical lenses or relatively small lenses using materials other than plastic.

[0062] If edge illumination is low, the noise-to-signal ratio at the image edges will be high before noise reduction processing. This makes it difficult to sufficiently reduce noise even after noise reduction. Especially when shooting at night, it is difficult to obtain images with good quality and adequate noise reduction if edge illumination is low.

[0063] In contrast, the camera module 11 according to this disclosure can effectively suppress the reduction in edge light by satisfying the following inequality (1):

[0064] ((m_fL_r3_si) - (m_fL_r2_si)) / 2 × (l_fL_r5_si) × π> 0.145 (1)

[0065] In inequality (1), (m_fL_r2_si) is the first direction cosine formed by the first off-axis ray (i.e. the upper edge ray) in the tangential direction. In the off-axis ray bundle, the first off-axis ray is located at one end of the off-axis side in the tangential direction. The off-axis ray bundle (i.e. a ray that deviates from the optical axis) forms an image within the image circle covering the effective pixel area on the imaging surface S (the same below).

[0066] (m_fL_r3_si) is the second direction cosine formed by the second off-axis ray (i.e. the lower edge ray) in the tangential direction. In the off-axis ray bundle, the second off-axis ray is located at one end of the optical axis side in the tangential direction (the same below).

[0067] (l_fL_r5_si) is the third off-axis ray (i.e., the edge ray) formed in the sagittal direction. In the off-axis ray bundle, the third off-axis ray is located at one end in the sagittal direction (the same applies below).

[0068] The tangential direction is perpendicular to the optical axis and parallel to the tangential plane, which includes the optical axis and the principal ray (i.e., the main ray) in the off-axis beam (hereinafter the same). The tangential direction can also be called the radial direction. The sagittal direction is perpendicular to both the optical axis and the tangential direction (hereinafter the same).

[0069] The direction cosine along the tangent direction can be positive in the direction from the edge side to the optical axis (i.e., the +tangent direction) and negative in the direction from the optical axis to the edge side (i.e., the -tangent direction). When the XYZ coordinates of the imaging lens assembly are defined as... Figure 2 As shown, in the negative direction of the X-coordinate (i.e., the +sagittal direction), the direction cosine of the sagittal direction can be positive. In the XYZ coordinate system of the imaging lens assembly 21, the direction along the optical axis from the object side to the imaging surface S side is the positive direction of the Z-coordinate (+Z). The direction along the tangential plane from the optical axis to the edge side is the positive direction of the Y-coordinate (+Y). Figure 2 In the diagram, the direction facing the back of the paper is the positive direction of the X-coordinate (+X).

[0070] The left side of inequality (1) corresponds to a solid angle projection area, which is obtained by projecting the solid angle onto the imaging surface S. The solid angle is formed by an off-axis ray beam, and its vertex is located at the imaging point of the off-axis ray beam.

[0071] Figure 2 A magnified view A shows a cross-section of the camera module 11 on a tangent plane in the region surrounding the image sensor 23. Figure 2 Also shown is a rear view B of the solid angle projection region PA as viewed from the back of the imaging surface S, wherein the solid angle projection region PA is formed by an off-axis ray beam 200. Figure 2 In the example shown, the off-axis ray beam 200 images at an imaging point Sp on the imaging surface S. The imaging point Sp is located within the image circle and away from the optical axis. The off-axis ray beam 200 includes a first off-axis ray 201, a second off-axis ray 202, a third off-axis ray 203, and a principal ray 204. In addition to these rays 201-204, the off-axis ray beam 200 also includes numerous rays not on the image plane. Figure 2 The light shown in the image.

[0072] exist Figure 2 In the example shown, the first off-axis ray 201 is located at the off-axis end (i.e., the -tangential direction end) of the off-axis ray beam 200 along the tangential direction (TD). The second off-axis ray 202 is located at the optical axis end (i.e., the +tangential direction end) of the off-axis ray beam 200 along the tangential direction (TD). The third off-axis ray 203 is located at the sagittal direction (SD) end (i.e., the +sagittal direction end) of the off-axis ray beam 200.

[0073] like Figure 2 As shown, the first direction cosine (m_fL_r2_si) corresponds to the length of the tangential direction component of a portion of the first off-axis ray 201, which lies within the range from the imaging point Sp to the unit length point. The second direction cosine (m_fL_r3_si) corresponds to the length of the tangential direction component of a portion of the second off-axis ray 202, which lies within the range from the imaging point Sp to the unit length point. The third direction cosine (l_fL_r5_si) corresponds to the length of the sagittal direction component of a portion of the third off-axis ray 203, which lies within the range from the imaging point Sp to the unit length point. The solid angle projection area PA of the off-axis ray beam 200 corresponds to the region formed by projecting the solid angle SA onto the imaging surface S. Figure 2 It can be seen that the left side of inequality (1): ((m_fL_r3_si)-(m_fL_r2_si)) / 2×(l_fL_r5_si)×π corresponds to the solid angle projection area PA of the ellipse.

[0074] like Figure 3 As shown, in one study of this disclosure, a new relative illuminance RI (i.e., the ratio of edge illuminance to center illuminance) was discovered. Figure 3 The vertical axis in the diagram) and the solid angle projected area PA ( Figure 3 The horizontal axis in the figure is approximately proportional to the horizontal axis. Based on this new discovery, this disclosure defines an inequality (1) for obtaining a large amount of edge light.

[0075] If the value of ((m_fL_r3_si)-(m_fL_r2_si)) / 2×(l_fL_r5_si)×π is lower than the lower limit of inequality (1), then the edge light intensity is low, and the brightness of the captured image is uneven. Most importantly, when shooting in dark places, for example, noise will increase and image quality will be degraded when correcting the brightness of the image edges.

[0076] Inequality (1) can be satisfied by appropriately adjusting the parameters of each lens (radius of curvature, inter-surface distance, refractive index, focal length, aspheric coefficient, etc.).

[0077] According to this disclosure, edge illumination can be increased by satisfying inequality (1). By increasing edge illumination, the noise-to-signal ratio at the image edges before denoising can be reduced. This allows for sufficient noise reduction after denoising. Therefore, the image quality of the captured image can be improved.

[0078] Furthermore, when camera module 11 satisfies the following inequality (2), camera module 11 can more effectively improve image quality:

[0079] Fno<1.8 (2)

[0080] In inequality (2), Fno is the F number (the same applies below).

[0081] If the value of Fno exceeds the upper limit of inequality (2), the amount of light illuminating the imaging surface S decreases, resulting in a darker captured image and poorer image quality when shooting in dark places. To improve image quality, Fno is preferably equal to or less than 1.6.

[0082] Furthermore, when the camera module 11 satisfies the following inequality (3), the camera module 11 can more effectively shorten the total length of the imaging lens assembly 21:

[0083] HFOV>38.5° (3)

[0084] In inequality (3), HFOV is half the field of view (the same applies below).

[0085] If the HFOV value is lower than the lower limit of inequality (3), the focal length of the imaging lens assembly 21 is too large, and thus the total length of the imaging lens assembly 21 is too large.

[0086] Furthermore, when the camera module 11 satisfies the following inequality (4), the camera module 11 can effectively improve its optical performance:

[0087] F1 / FL < 1.8 (4)

[0088] In inequality (4), F1 is the focal length of the first lens (the same applies below). FL is the focal length of the imaging lens assembly 21 (the same applies below).

[0089] If the F1 / FL value exceeds the upper limit of inequality (4), the positive refractive power of the first lens decreases, thereby affecting the light-converging ability and making it difficult to obtain a bright captured image. To improve optical performance, the F1 / FL value is more preferably equal to or less than 1.6.

[0090] Furthermore, when the camera module 11 satisfies the following inequality (5), the camera module 11 can effectively improve its optical performance:

[0091] F L1-L5 / FL<1.8 (5)

[0092] In inequality (5), F L1-L5 This refers to the composite focal length from the first lens to the fifth lens (the same applies below).

[0093] If F L1-L5 If the / FL value exceeds the upper limit of inequality (5), the positive refractive power of the object-side lens group is relatively small, making it difficult to correct on-axis aberrations (i.e., spherical aberration and chromatic aberration). To improve optical performance, F L1-L5 / FL is more preferably equal to or less than 1.6.

[0094] Furthermore, when the camera module 11 satisfies the following inequality (6), the camera module 11 can effectively improve the optical performance and manufacturability of the imaging lens assembly 21:

[0095] 2.0 < ∑|FL / F(i)| < 7.0 (6)

[0096] In inequality (6), F(i) is the focal length of the i-th lens (the same below), and the value of i ranges from 1 to 8. That is, ∑|FL / F(i)| equals |FL / F(1)|+|FL / F(2)|+....+|FL / F(8)|.

[0097] If the value of ∑|FL / F(i)| is lower than the lower limit of inequality (6), the refractive power of each lens is too small, making it difficult to correct aberrations, and the total length of the imaging lens assembly 21 increases. If the value of ∑|FL / F(i)| exceeds the upper limit of inequality (6), the refractive power of each lens is too large, thus increasing the sensitivity of the imaging lens assembly 21 to manufacturing errors, resulting in a decrease in yield. To improve the optical performance and manufacturability of the imaging lens assembly 21, the value of ∑|FL / F(i)| is more preferably above 3.0 and below 6.0.

[0098] Furthermore, when the camera module 11 satisfies the following inequality (7), the camera module 11 can effectively improve the optical performance and manufacturability of the imaging lens assembly 21:

[0099] ∑|1 / Ri|<3.0 (7)

[0100] In inequality (7), Ri is the radius of curvature of the i-th lens surface from the object side (the same applies below), and the value of i ranges from 1 to 16. That is, ∑|1 / Ri| equals |1 / R1|+|1 / R2|+…+|1 / R16|.

[0101] If the value of ∑|1 / Ri| exceeds the upper limit of inequality (7), the refractive power of each lens is too large, resulting in higher-order aberrations. This increases the manufacturing error sensitivity of the imaging lens assembly 21, leading to a decrease in yield. To improve the optical performance and manufacturability of the imaging lens assembly 21, the value of ∑|1 / Ri| is more preferably equal to or less than 2.0.

[0102] Furthermore, when the camera module 11 satisfies the following inequality (8), the camera module 11 can effectively improve the optical performance and manufacturability of the imaging lens assembly 21:

[0103] 1.0 <TTL / D L1-L5 <4.0 (8)

[0104] In inequality (8), TTL is the length along the optical axis from the object-side surface of the first lens to the focal point of the imaging lens assembly 21, i.e., the total trajectory length of the imaging lens assembly 21 (the same applies below). D L1-L5 It is the distance between the object-side surface of the first lens and the image-side surface of the fifth lens on the optical axis (the same applies below).

[0105] If TTL / D L1-L5 If the value is lower than the lower limit of inequality (8), the total length of the object-side lens group is too large, making it difficult to use the image-side lens group to correct aberrations at the image edges. If TTL / D L1-L5 If the value exceeds the upper limit of inequality (8), the positive refractive force of the object-side lens group is too large, making it difficult to correct axial aberrations. This increases the sensitivity of the imaging lens assembly 21 to manufacturing errors, leading to a decrease in yield. To improve the optical performance and manufacturability of the imaging lens assembly 21, TTL / D... L1-L5 The value is preferably above 1.5 and below 2.5.

[0106] Furthermore, when the camera module 11 satisfies the following inequality (9), the camera module 11 can be very small, and its optical performance can be effectively improved:

[0107] 0.5 <R3 / R4<3.5 (9)

[0108] In inequality (9), R3 is the radius of curvature of the object-side surface of the second lens (the same applies below). R4 is the radius of curvature of the image-side surface of the second lens (the same applies below).

[0109] If the value of R3 / R4 is below the lower limit of inequality (9), the negative refractive power of the second lens is small, resulting in insufficient light divergence at the edges, making it difficult to correct aberrations, and the total length of the imaging lens assembly 21 is too large. If the value of R3 / R4 exceeds the upper limit of inequality (9), the curvature of the image-side surface of the second lens is too large, resulting in higher-order aberrations and Fresnel reflections, which reduces the amount of light at the edges. In order to miniaturize the imaging lens assembly 21 and improve optical performance, the value of R3 / R4 is more preferably above 1.0 and below 2.5.

[0110] In addition, when the camera module 11 satisfies the following inequality (10), the camera module 11 can effectively improve its optical performance:

[0111] R12 / R11>0 (10)

[0112] In inequality (10), R11 is the radius of curvature of the object-side surface of the sixth lens (the same applies below). R12 is the radius of curvature of the image-side surface of the sixth lens (the same applies below).

[0113] If the value of R12 / R11 is lower than the lower limit of inequality (10), the sixth lens is not meniscus, and therefore the refraction angle of on-axis rays is large, making it difficult to correct aberrations. The value of R12 / R11 is more preferably equal to or greater than 0.5.

[0114] Furthermore, when the camera module 11 satisfies the following inequality (11), the camera module 11 can effectively improve the manufacturability of the imaging lens assembly 21:

[0115] R15 / R13<0 (11)

[0116] In inequality (11), R13 is the radius of curvature of the object-side surface of the seventh lens (the same applies below). R15 is the radius of curvature of the object-side surface of the eighth lens (the same applies below).

[0117] If the value of R15 / R13 exceeds the upper limit of inequality (11), it will be difficult to achieve a balance between large aperture and suitable viewing angle due to the limitations of the shapes of the seventh and eighth lenses.

[0118] In addition, when the camera module 11 satisfies the following inequality (12), the camera module 11 can effectively improve its optical performance:

[0119] Nd L2 <1.75 (12)

[0120] In inequality (12), NdL2 Here is the refractive index at line d of the second lens (the same applies below).

[0121] If Nd L2 If the value exceeds the upper limit of inequality (12), the negative refractive power of the second lens is too large, making it difficult to correct aberrations. Thinning the second lens to effectively correct aberrations would reduce the manufacturability of the imaging lens assembly 21. L2 The value is more preferably less than 1.72.

[0122] In addition, when the camera module 11 satisfies the following inequality (13), the camera module 11 can effectively improve its optical performance:

[0123] ν1>40 (13)

[0124] In inequality (13), v1 is the Abbe number of the first lens (the same applies below).

[0125] If the value of ν1 is below the lower limit of inequality (13), the correction of axial chromatic aberration is insufficient, and therefore it is difficult to maintain good optical performance.

[0126] In addition, when the camera module 11 satisfies the following inequality (14), the camera module 11 can effectively improve its optical performance:

[0127] ν2<35 (14)

[0128] In inequality (14), v2 is the Abbe number of the second lens (the same applies below).

[0129] If the value of ν2 exceeds the upper limit of inequality (14), the axial chromatic aberration is not adequately corrected, making it difficult to maintain good optical performance.

[0130] In addition, when the camera module 11 satisfies the following inequality (15), the camera module 11 can effectively improve its optical performance:

[0131] ν4<35 (15)

[0132] In inequality (15), v4 is the Abbe number of the fourth lens (the same applies below).

[0133] If the value of ν4 exceeds the upper limit of inequality (15), the correction for chromatic aberration is insufficient, making it difficult to maintain good optical performance. The value of ν4 is more preferably less than 30.

[0134] Furthermore, the camera module 11 can effectively improve its optical performance when the following inequality (16) is satisfied:

[0135] ν6<35 (16)

[0136] In inequality (16), v6 is the Abbe number of the sixth lens (the same applies below).

[0137] If the value of ν6 exceeds the upper limit of inequality (16), the correction for chromatic aberration is insufficient, making it difficult to maintain good optical performance. The value of ν6 is more preferably less than 30.

[0138] Furthermore, the imaging lens assembly 21 can be miniaturized more effectively when the camera module 11 satisfies the following inequality (17):

[0139] TTL / imgH < 2.0 (17)

[0140] In inequality (17), imgH is the image height (the same applies below).

[0141] If the value of TTL / imgH exceeds the upper limit of inequality (17), the total trajectory length of the imaging lens assembly 21 is too large, making it difficult to miniaturize the imaging lens assembly 21. In order to achieve a balance between miniaturization and optical performance, the value of TTL / imgH is more preferably less than 1.6.

[0142] The camera module 11, including the imaging lens assembly 21, is suitable for compact digital devices (imaging devices 1) such as mobile phones, wearable cameras, and surveillance cameras.

[0143] <Camera Module Configuration Example>

[0144] Next, more specific examples of applying this disclosure will be described. In the following examples, the symbol “Li” indicates the number of the i-th lens in a sequence increasing sequentially from the object side toward the imaging side. For example, “L1” indicates the first lens, “LiR1” represents the object-side surface (i.e., the first surface) of the i-th lens, and “LiR2” represents the image-side surface (i.e., the second surface) of the i-th lens.

[0145] “R” indicates the center curvature radius value (mm). For “R”, “E+i” indicates an exponential expression with a base of 10, i.e., “10”. i For example, "1.00E+18" means "1.00 × 10". 18 This exponential expression also applies to the aspherical coefficients described later.

[0146] “D” indicates the distance (mm) between the i-th surface and the (i+1)-th surface on the optical axis.

[0147] “Nd” indicates the refractive index of the material of the optical element having the i-th surface at line d (wavelength 587.6 nm).

[0148] “νd” indicates the Abbe number of the material of the optical element with the i-th surface at line d.

[0149] “Fno” indicates the F number.

[0150] In the table below showing the focal length of each lens, "-" indicates a negative focal length, and no "-" indicates a positive focal length.

[0151] The imaging lens assembly 21 used in the following example includes a lens with an aspherical surface. The aspherical shape of the lens is defined by the following formula (18):

[0152] Z = C × h 2 / {1+[1-(1+K)×C 2 ×h 2 ] 1 / 2}+ΣAn×h n (18),

[0153] (n is an integer equal to or greater than 3).

[0154] In formula (18), Z is the depth of the aspherical surface, C is the paraxial curvature equal to 1 / R, h is the distance from the optical axis to the lens surface, K is the taper coefficient (second-order aspherical coefficient), and An is the nth-order aspherical coefficient.

[0155] [First Example]

[0156] The description applies specific numerical values. Figure 4 The first example of camera module 11 shown.

[0157] In the first example, such as Figure 4 As shown, the imaging lens assembly 21 includes, in order from the object side to the image side: a first lens L1 with positive refractive power and convex surface facing the object side, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power and convex surface facing the image side, a sixth lens L6 with positive refractive power, a seventh lens L7 with positive refractive power, and an eighth lens with negative refractive power and concave surface facing both the object side and the image side.

[0158] The aperture stop 3 is positioned on the image side relative to the first surface of the first lens L1, and on the object side relative to the second surface of the first lens L1.

[0159] Table 1 shows the radius of curvature R (mm), surface distance D (mm), refractive index Nd, and Abbe number νd of the lens data as a first example. Table 2 shows the focal length FL (mm), F-number Fno, angle of view (°), total trajectory length TTL (mm) obtained when photographing an object point at infinity, and sensor size (mm) of the imaging lens assembly 21. 2 Table 3 shows the focal length values ​​of the first lens L1 to the eighth lens L8. Table 4 shows the values ​​corresponding to the conditional expressions shown in inequalities (1) to (17). Table 5 shows the radius of curvature of each lens from the first lens L1 to the eighth lens L8, the third to thirtieth aspherical coefficients on each side of each lens, and the cone coefficient K.

[0160] Table 1

[0161] R D Nd vd 1.00E+18 1.318 Aperture stop 1.00E+18 -1.318 L1R1 3.539 1.648 1.547 55.912 L1R2 17.611 0.069 L2R1 5.110 0.308 1.684 19.246 L2R2 3.460 0.267 L3R1 8.308 0.678 1.627 25.282 L3R2 12.913 0.401 L4R1 72.887 0.320 1.684 19.246 L4R2 17.251 0.052 L5R1 20.623 1.135 1.549 53.395 L5R2 -20.886 0.652 L6R1 7.402 0.450 1.6834 19.28 L6R2 9.042 0.406 L7R1 7.109 0.723 1.5694 31.64 L7R2 26.118 0.906 L8R1 -20.862 0.467 1.6180 26.43 L8R2 4.462 0.146 IRCF 1.00E+18 0.200 1.5200 64.20 0.623

[0162] Table 2

[0163] FL 7.424 Fno 1.38 Perspective 78.62 TTL(INF) 9.45 Sensor size 12.492

[0164] Table 3

[0165] L1 7.81 L2 -16.93 L3 35.65 L4 -33.12 L5 19.06 L6 53.51 L7 16.84 L8 -5.89

[0166] Table 4

[0167] conditional expression First Example ((m_fL_r3_si)-(m_fL_r2_si)) / 2*(I_fL_r5_si)*π>0.145 0.195 Fno < 1.8 1.38 HFOV > 38.5 39.31 F1 / FL<1.8 1.052 <![CDATA[F L1-L5 / FL<1.8]]> 1.134 2.0<Σ|FL / F(i)|<7.0 4.051 Σ|1 / Ri|<3.0 1.695 <![CDATA[1.0<TTL / D L1-L5 <4.0]]> 2.071 0.5<R3 / R4<3.5 1.477 R12 / R11>0 1.222 R15 / R13<0 -2.935 <![CDATA[Nd L2 <1.75]]> 1.684 v1>40 55.91 v2<35 19.25 v4<35 19.25 v6<35 19.28 TTL / imgH<2.0 1.513

[0168] Table 5

[0169]

[0170]

[0171]

[0172] The aberrations in the first example above are as follows: Figure 5 As shown. As an example of aberration, Figure 5 Spherical aberration, astigmatism (field curvature), and distortion are shown as examples of aberrations. Each of these aberration plots shows the aberration with the d-line (587.56 nm) as the reference wavelength. In the spherical aberration plots, aberrations relative to the g-line (435.84 nm) and C-line (656.27 nm) are also shown. In the graph showing astigmatism, "S" indicates the aberration value on the sagittal image surface, and "T" indicates the aberration value on the tangential image surface. "IMG HT" indicates the image height. This also applies to the aberration plots in the other examples.

[0173] As can be seen from the aberration diagram above, it is clear that the camera module 11 in the first example can satisfactorily correct various aberrations to achieve good optical performance while maintaining a small size.

[0174] [Second Example]

[0175] Next, we will describe applying specific values. Figure 6 The second example of camera module 11 shown.

[0176] The lens parameters corresponding to those in the first example are shown in Tables 6 to 10.

[0177] Table 6

[0178] R D Nd vd 1.00E+18 1.256 Aperture stop 1.00E+18 -1.256 L1R1 3.476 1.562 1.540 55.983 L1R2 18.139 0.025 L2R1 5.520 0.300 1.633 22.341 L2R2 3.373 0.305 L3R1 8.332 0.557 1.600 29.642 L3R2 14.479 0.432 L4R1 42.667 0.312 1.678 19.246 L4R2 18.033 0.048 L5R1 29.392 1.122 1.530 56.130 L5R2 -18.313 0.544 L6R1 7.203 0.452 1.6776 19.25 L6R2 10.192 0.451 L7R1 8.230 0.793 1.5688 33.95 L7R2 19.445 0.977 L8R1 -19.955 0.495 1.5347 41.23 L8R2 4.776 0.226 IRCF 1.00E+18 0.200 1.5200 64.20 0.650

[0179] Table 7

[0180] FL 7.493 Fno 1.38 Perspective 78.39 TTL(INF) 9.45 Sensor size 12.492

[0181] Table 8

[0182] L1 7.65 L2 -14.36 L3 31.47 L4 -45.91 L5 21.38 L6 33.84 L7 24.33 L8 -7.13

[0183] Table 9

[0184] conditional expression Second example ((m_fL_r3_si)-(m_fL_r2_si)) / 2*(I_fL_r5_si)*π>0.145 0.136 Fno < 1.8 1.38 HFOV > 38.5 39.18 F1 / FL<1.8 1.024 <![CDATA[F L1-L5 / FL<1.8]]> 1.141 2.0<Σ|FL / F(i)|<7.0 3.822 Σ|1 / Ri|<3.0 1.637 <![CDATA[1.0<TTL / D L1-L5 <4.0]]> 2.027 0.5<R3 / R4<3.5 1.637 R12 / R11>0 1.415 R15 / R13<0 -2.425 <![CDATA[Nd L2 <1.75]]> 1.638 v1>40 55.98 v2＜35 22.34 v4＜35 19.25 v6＜35 19.25 TTL / imgH < 2.0 1.513

[0185] Table 10

[0186]

[0187]

[0188]

[0189] The aberrations in the second example are as follows: Figure 7 As shown. According to the second example, by making the lens parameters different from those of the first example, the same effect as the first example can be obtained while further increasing the degrees of freedom in designing the camera module 11 according to this disclosure.

[0190] [Third Example]

[0191] Next, we will describe applying specific values. Figure 8 The third example of camera module 11 shown.

[0192] The lens parameters corresponding to those in the first example are shown in Tables 11 to 15.

[0193] Table 11

[0194] R D Nd vd 1.00E+18 0.746 Aperture stop 1.00E+18 -0.746 L1R1 3.651 1.094 1.528 56.200 L1R2 13.822 0.052 L2R1 4.748 0.301 1.588 28.197 L2R2 3.465 0.223 L3R1 8.688 0.423 1.588 20.546 L3R2 14.648 0.472 L4R1 63.544 0.375 1.684 19.246 L4R2 16.456 0.040 L5R1 23.418 1.118 1.547 55.912 L5R2 -18.184 0.572 L6R1 7.892 0.473 1.6839 19.25 L6R2 9.809 0.310 L7R1 6.150 1.033 1.6839 19.25 L7R2 731.143 0.849 L8R1 -17.729 0.652 1.6333 22.79 L8R2 4.511 0.215 IRCF 1.00E+18 0.200 1.5200 64.20 0.600

[0195] Table 12

[0196] FL 6.359 Fno 1.38 Perspective 87.24 TTL(INF) 9.00288 Sensor size 12.492

[0197] Table 13

[0198] L1 9.06 L2 -23.87 L3 31.09 L4 -32.58 L5 18.90 L6 53.66 L7 9.06 L8 -5.61

[0199] Table 14

[0200] conditional expression Third Example ((m_fL_r3_si)-(m_fL_r2_si)) / 2*(I_fL_r5_si)*π>0.145 0.171 Fno < 1.8 1.38 HFOV > 38.5 43.62 F1 / FL<1.8 1.425 <![CDATA[F L1-L5 / FL<1.8]]> 1.327 2.0<Σ|FL / F(i)|<7.0 3.657 Σ|1 / Ri|<3.0 1.651 <![CDATA[1.0<TTL / D L1-L5 <4.0]]> 2.197 0.5<R3 / R4<3.5 1.370 R12 / R11>0 1.243 R15 / R13<0 -2.883 <![CDATA[Nd L2 <1.75]]> 1.588 v1>40 56.20 v2<35 28.20 v4<35 19.25 v6<35 19.25 TTL / imgH<2.0 1.441

[0201] Table 15

[0202]

[0203]

[0204] The aberrations in the third example are as follows: Figure 9 As shown. According to the third example, by making the lens parameters different from those of the first example, the same effect as the first example can be obtained while further increasing the degrees of freedom in designing the camera module 11 according to this disclosure.

[0205] [Fourth Example]

[0206] Next, we will describe applying specific values. Figure 10 The fourth example of camera module 11 shown.

[0207] Unlike the first to third examples, in the fourth example, the fourth lens L4 has positive refractive power, while the sixth lens L6 has negative refractive power.

[0208] The lens parameters corresponding to the lens parameters of the first example are shown in Tables 16 to 20.

[0209] Table 16

[0210] R D Nd vd 1.00E+18 1.280 Aperture stop 1.00E+18 -1.280 L1R1 3.468 1.608 1.545 55.912 L1R2 17.865 0.026 L2R1 5.178 0.300 1.678 19.246 L2R2 3.412 0.273 L3R1 7.555 0.421 1.633 23.693 L3R2 10.880 0.605 L4R1 -25.964 0.338 1.678 19.246 L4R2 -26.040 0.020 L5R1 35117.401 0.882 1.545 55.912 L5R2 -25.063 0.725 L6R1 9.038 0.492 1.5483 19.25 L6R2 8.267 0.358 L7R1 6.847 1.048 1.5483 52.78 L7R2 -31.258 0.951 L8R1 -7.951 0.450 1.5516 39.61 L8R2 4.862 0.152 IRCF 1.00E+18 0.200 1.5200 64.20 0.600

[0211] Table 17

[0212] FL 7.581 Fno 1.38 Perspective 78.88 TTL(INF) 9.45 Sensor size 12.492

[0213] Table 18

[0214] L1 7.57 L2 -15.72 L3 36.91 L4 16135.76 L5 45.81 L6 -191.46 L7 10.31 L8 -5.38

[0215] Table 19

[0216] conditional expression Fourth example ((m_fL_r3_si)-(m_fL_r2_si)) / 2*(I_fL_r5_si)*π>0.145 0.192 Fno < 1.8 1.38 HFOV > 38.5 39.45 F1 / FL<1.8 1.002 <![CDATA[F L1-L5 / FL<1.8]]> 1.120 2.0<Σ|FL / F(i)|<7.0 4.028 Σ|1 / Ri|<3.0 1.364 <![CDATA[1.0<TTL / D L1-L5 <4.0]]> 2.113 0.5<R3 / R4<3.5 1.518 R12 / R11>0 0.915 R15 / R13<0 -1.161 <![CDATA[Nd L2 <1.75]]> 1.684 v1>40 55.91 v2<35 19.25 v4<35 19.25 v6<35 19.25 TTL / imgH<2.0 1.513

[0217] Table 20

[0218]

[0219]

[0220]

[0221] The aberrations in the fourth example are as follows Figure 11 As shown. According to the fourth example, by making the lens parameters different from those of the first example, the same effect as the first example can be obtained while further increasing the degrees of freedom in designing the camera module 11 according to this disclosure.

[0222] [Fifth Example]

[0223] Next, we will describe applying specific values. Figure 12 The fifth example of camera module 11 shown.

[0224] Unlike the first to third examples, in the fifth example, the sixth lens L6 has negative refractive power.

[0225] The lens parameters corresponding to the lens parameters in the first example are shown in Tables 21 to 25.

[0226] Table 21

[0227] R D Nd vd 1.00E+18 1.043 Aperture stop 1.00E+18 -1.043 L1R1 3.471 1.506 1.547 55.912 L1R2 16.813 0.022 L2R1 5.157 0.300 1.684 19.246 L2R2 3.539 0.256 L3R1 7.659 0.362 1.684 19.246 L3R2 10.442 0.670 L4R1 -18.543 0.300 1.684 19.246 L4R2 -89.989 0.020 L5R1 33.970 0.949 1.547 55.912 L5R2 -24.273 0.649 L6R1 9.226 0.525 1.6839 19.25 L6R2 8.385 0.344 L7R1 5.505 1.182 1.5626 44.10 L7R2 -32.004 0.976 L8R1 -6.346 0.450 1.5660 32.39 L8R2 5.708 0.137 IRCF 1.00E+18 0.200 1.5200 64.20 0.600

[0228] Table 22

[0229] FL 7.338 Fno 1.38 Perspective 79.48 TTL(INF) 9.45 Sensor size 12.492

[0230] Table 23

[0231] L1 7.70 L2 -17.84 L3 39.92 L4 -34.21 L5 26.05 L6 -180.06 L7 8.44 L8 -5.24

[0232] Table 24

[0233] conditional expression Fifth example ((m_fL_r3_si)-(m_fL_r2_si)) / 2*(I_fL_r5_si)*π>0.145 0.174 Fno<1.8 1.38 HFOV > 38.5 39.74 F1 / FL<1.8 1.049 <![CDATA[F L1-L5 / FL<1.8]]> 1.217 2.0<Σ|FL / F(i)|<7.0 4.355 Σ|1 / Ri|<3.0 1.369 <![CDATA[1.0<TTL / D L1-L5 <4.0]]> 2.155 0.5<R3 / R4<3.5 1.457 R12 / R11>0 0.909 R15 / R13<0 -1.153 <![CDATA[Nd L2 <1.75]]> 1.684 v1>40 55.91 v2<35 19.25 v4<35 19.25 v6<35 19.25 TTL / imgH<2.0 1.513

[0234] Table 25

[0235]

[0236]

[0237]

[0238] The aberrations in the fifth example are as follows Figure 13 As shown. According to the fifth example, by making the lens parameters different from those of the first example, the same effect as the first example can be obtained while further increasing the degrees of freedom in designing the camera module 11 according to this disclosure.

[0239] [Sixth Example]

[0240] Next, we will describe applying specific values. Figure 14 The sixth example of camera module 11 shown.

[0241] The lens parameters corresponding to those in the first example are shown in Tables 26 to 30.

[0242] Table 26

[0243] R D Nd vd 1.00E+18 1.304 Aperture stop 1.00E+18 -1.304 L1R1 3.473 1.625 1.540 56.013 L1R2 25.866 0.025 L2R1 5.057 0.300 1.684 19.246 L2R2 3.379 0.313 L3R1 9.056 0.376 1.605 28.557 L3R2 11.706 0.498 L4R1 41.538 0.308 1.684 19.246 L4R2 16.555 0.029 L5R1 23.607 1.015 1.547 55.912 L5R2 -20.996 0.585 L6R1 7.507 0.450 1.6808 19.48 L6R2 9.068 0.460 L7R1 8.835 1.155 1.5920 29.17 L7R2 33.668 0.867 L8R1 -15.733 0.486 1.5696 39.58 L8R2 4.627 0.158 IRCF 1.00E+18 0.200 1.5200 64.20 0.600

[0244] Table 27

[0245] FL 7.587 Fno 1.38 Perspective 77.39 TTL(INF) 9.45 Sensor size 12.492

[0246] Table 28

[0247] L1 7.25 L2 -16.05 L3 62.76 L4 -40.45 L5 20.49 L6 57.37 L7 19.89 L8 -6.22

[0248] Table 29

[0249] conditional expression Sixth example ((m_fL_r3_si)-(m_fL_r2_si)) / 2*(I_fL_r5_si)*π>0.145 0.187 Fno < 1.8 1.38 HFOV > 38.5 38.70 F1 / FL<1.8 0.955 <![CDATA[F L1-L5 / FL<1.8]]> 1.111 2.0<Σ|FL / F(i)|<7.0 3.931 Σ|1 / Ri|<3.0 1.634 <![CDATA[1.0<TTL / D L1-L5 <4.0]]> 2.105 0.5<R3 / R4<3.5 1.497 R12 / R11>0 1.208 R15 / R13<0 -1.781 <![CDATA[Nd L2 <1.75]]> 1.684 v1>40 56.01 v2<35 19.25 v4<35 19.25 v6<35 19.48 TTL / imgH<2.0 1.513

[0250] Table 30

[0251]

[0252]

[0253]

[0254] The aberrations in the sixth example are as follows Figure 15 As shown. According to the sixth example, by making the lens parameters different from those of the first example, the same effect as the first example can be obtained while further increasing the degrees of freedom in designing the camera module 11 according to this disclosure.

[0255] [Seventh Example]

[0256] Next, we will describe applying specific values. Figure 16 The seventh example of camera module 11 shown.

[0257] Unlike the first through sixth examples, in the seventh example, the fifth lens L5 has negative refractive power.

[0258] The lens parameters corresponding to those in the first example are shown in Tables 31 to 35.

[0259] Table 31

[0260] R D Nd vd 1.00E+18 1.292 Aperture stop 1.00E+18 -1.292 L1R1 3.466 1.604 1.545 55.912 L1R2 17.881 0.020 L2R1 5.089 0.300 1.678 19.246 L2R2 3.423 0.262 L3R1 7.575 0.387 1.620 25.648 L3R2 10.044 0.508 L4R1 33.638 0.300 1.678 19.246 L4R2 24.564 0.225 L5R1 54.598 0.781 1.520 56.301 L5R2 29.992 0.412 L6R1 7.629 0.611 1.6002 29.48 L6R2 11.516 0.523 L7R1 5.821 1.009 1.5510 50.47 L7R2 -116.701 1.101 L8R1 -9.097 0.450 1.5430 47.45 L8R2 4.805 0.157 IRCF 1.00E+18 0.200 1.5200 64.20 0.600

[0261] FL 7.577 Fno 1.38 Perspective 78.19 TTL(INF) 9.45 Sensor size 12.492

[0262] Table 33

[0263] L1 7.57 L2 -16.50 L3 46.54 L4 -134.97 L5 -129.04 L6 35.33 L7 10.06 L8 -5.70

[0264] Table 34

[0265] conditional expression Seventh Example ((m_fL_r3_si)-(m_fL_r2_si)) / 2*(I_fL_r5_si)*π>0.145 0.181 Fno<1.8 1.38 HFOV > 38.5 39.10 F1 / FL<1.8 1.002 <![CDATA[F L1-L5 / FL<1.8]]> 1.386 2.0<Σ|FL / F(i)|<7.0 4.022 Σ|1 / Ri|<3.0 1.666 <![CDATA[1.0<TTL / D L1-L5 <4.0]]> 2.154 0.5<R3 / R4<3.5 1.487 R12 / R11>0 1.510 R15 / R13<0 -1.563 <![CDATA[Nd L2 <1.75]]> 1.684 v1>40 55.91 v2<35 19.25 v4<35 19.25 v6<35 29.48 TTL / imgH<2.0 1.513

[0266] Table 35

[0267]

[0268]

[0269]

[0270] The aberrations in the seventh example are as follows Figure 17 As shown. According to the seventh example, by making the lens parameters different from those of the first example, the same effect as the first example can be obtained while further increasing the degrees of freedom in designing the camera module 11 according to this disclosure.

[0271] [Eighth Example]

[0272] Next, we will describe applying specific values. Figure 18 The eighth example of camera module 11 shown.

[0273] Unlike the first through seventh examples, in the eighth example, the seventh lens L7 has negative refractive power.

[0274] The lens parameters corresponding to those in the first example are shown in Tables 36 to 40.

[0275] Table 36

[0276] R D Nd vd 1.00E+18 1.197 Aperture stop 1.00E+18 -1.197 L1R1 3.627 1.702 1.545 55.913 L1R2 14.357 0.020 L2R1 5.748 0.600 1.678 19.246 L2R2 3.678 0.203 L3R1 6.739 0.811 1.545 55.912 L3R2 14.240 0.371 L4R1 76.377 0.600 1.677 19.267 L4R2 22.291 0.021 L5R1 23.385 1.073 1.545 55.914 L5R2 -23.841 0.538 L6R1 5.777 0.704 1.6129 26.19 L6R2 9.693 0.411 L7R1 8.676 0.600 1.6676 19.84 L7R2 7.469 0.553 L8R1 -33.672 0.450 1.5448 55.91 L8R2 4.297 0.142 IRCF 1.00E+18 0.334 1.5200 64.20 0.466

[0277] Table 37

[0278] FL 7.515 Fno 1.38 Perspective 78.00 TTL(INF) 9.6 Sensor size 12.492

[0279] Table 38

[0280] L1 8.41 L2 -16.93 L3 22.54 L4 -46.27 L5 21.78 L6 21.68 L7 -99.64 L8 -6.94

[0281] Table 39

[0282] conditional expression Eighth Example ((m_fL_r3_si)-(m_fL_r2_si)) / 2*(I_fL_r5_si)*π>0.145 0.141 Fno < 1.8 1.38 HFOV > 38.5 39.00 F1 / FL<1.8 1.121 <![CDATA[F L1-L5 / FL<1.8]]> 1.069 2.0<Σ|FL / F(i)|<7.0 3.675 Σ|1 / Ri|<3.0 1.797 <![CDATA[1.0<TTL / D L1-L5 <4.0]]> 1.777 0.5<R3 / R4<3.5 1.563 R12 / R11>0 1.678 R15 / R13<0 -3.881 <![CDATA[Nd L2 <1.75]]> 1.678 v1>40 55.91 v2<35 19.25 v4<35 19.27 v6<35 26.19 TTL / imgH<2.0 1.537

[0283] Table 40

[0284]

[0285]

[0286]

[0287] The aberrations in the eighth example are as follows Figure 19As shown. According to the eighth example, by making the lens parameters different from those of the first example, the same effect as the first example can be obtained while further increasing the degrees of freedom in designing the camera module 11 according to this disclosure.

[0288] In the description of embodiments of this disclosure, terms such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” should be interpreted as referring to the direction or position described or shown in the accompanying drawings. These relative terms are used only to simplify the description of this disclosure and do not indicate or imply that the mentioned equipment or elements must have a particular orientation, or must be constructed or operated in a particular orientation. Therefore, these terms should not be used to limit this disclosure.

[0289] Furthermore, terms such as “first” and “second” used herein are for descriptive purposes and are not intended to indicate or imply relative importance or significance, nor are they intended to imply the number of technical features indicated. Therefore, a feature defined as “first” and “second” may include one or more of those features. In the description of this disclosure, unless otherwise specified, “multiple” means “two or more”.

[0290] In the description of embodiments of this disclosure, unless otherwise specified or limited, the terms “installation,” “connection,” “coupling,” etc. are used broadly and can be, for example, a fixed connection, a detachable connection, or an integral connection; they can also be a mechanical or electrical connection; they can be a direct connection or an indirect connection via an intermediate structure; or they can be internal communication between two elements as can be understood by a person skilled in the art based on the specific circumstances.

[0291] In embodiments of this disclosure, unless otherwise specified or limited, a structure where the first feature is "above" or "below" the second feature can include embodiments where the first and second features are in direct contact, or embodiments where the first and second features are in contact with each other but not in direct contact, but via additional features formed therebetween. Furthermore, "above," "on top of," or "on top of" the second feature can include embodiments where the first feature is orthogonally or obliquely positioned above, on, or "on top of" the second feature, or simply means that the height of the first feature is greater than the height of the second feature; while "below," "under," or "under" the second feature can include embodiments where the first feature is orthogonally or obliquely positioned below, under, or "under" the second feature, or simply means that the height of the first feature is less than the height of the second feature.

[0292] Various embodiments and examples are provided in the foregoing description to implement different structures of this disclosure. To simplify this disclosure, certain elements and arrangements have been described above. However, these elements and arrangements are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or lettering may be repeated in different examples of this disclosure. Such repetition is for simplification and clarity and does not imply any relationship between different embodiments and / or arrangements. In addition, examples of different processes and materials are provided in this disclosure. However, those skilled in the art will understand that other processes and / or materials may also be applied.

[0293] Throughout this specification, the terms "an embodiment," "some embodiments," "an exemplary embodiment," "an example," "a specific example," or "some examples" mean that a particular feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this disclosure. Therefore, the appearance of these phrases throughout this specification does not necessarily refer to the same embodiment or example of this disclosure. Furthermore, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

[0294] Any process or method described in the flowchart or otherwise herein can be understood as including one or more modules, segments, or portions of code comprising executable instructions for implementing specific logical functions or steps within the process. The scope of preferred embodiments of this disclosure includes other implementations, wherein those skilled in the art will understand that functionality may be implemented in a sequence other than the sequence shown or discussed, including implementation in substantially the same sequence or in the reverse sequence.

[0295] The logic and / or steps otherwise described or illustrated in this document, such as a specific list of executable instructions for implementing logical functions, may be embodied in any computer-readable medium that will be used by or in conjunction with an instruction execution system, device, or apparatus (e.g., a computer-based system, a processor-integrated system, or other system capable of retrieving instructions from or executing instructions). As specified in the specification, "computer-readable medium" can be any device suitable for including, storing, communicating, propagating, or transmitting programs that will be used by or in conjunction with an instruction execution system, device, or apparatus. More specific examples of computer-readable media include, but are not limited to: electronic connections (electronic devices) having one or more lines, portable computer peripherals (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, a computer-readable medium can even be paper or other suitable media on which a program can be printed, because, for example, the paper or other suitable medium can be optically scanned, and then, if necessary, edited, decrypted, or processed by other suitable methods to obtain the program electrically, which can then be stored in computer memory.

[0296] It should be understood that each part of this disclosure can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods may be implemented by software or firmware stored in memory and may be executed by a suitable instruction execution system. For example, if the multiple steps or methods are implemented by hardware, similarly in another embodiment, these steps or methods may be implemented by one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing data signals, application-specific integrated circuits (ASICs) having suitable combinations of logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0297] Those skilled in the art will understand that all or part of the steps in the exemplary methods described above in this disclosure can be implemented by using program commands to related hardware. The program may be stored in a computer-readable storage medium, and when run on a computer, the program includes a combination of one or more steps from the method implementations of this disclosure.

[0298] Furthermore, each functional unit of the embodiments of this disclosure can be integrated into a processing module, or these units can be physically independent, or two or more units can be integrated into a processing module. The integrated module can be implemented in hardware or as a software functional module. When the integrated module is implemented as a software functional module and sold or used as a standalone product, the integrated module can be stored in a computer-readable storage medium.

[0299] The aforementioned storage media can be read-only memory, disk, CD, etc.

[0300] Although embodiments of the present disclosure have been shown and described, those skilled in the art will understand that these embodiments are illustrative and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and variations may be made to the embodiments without departing from the scope of the present disclosure.

Claims

1. An imaging lens assembly, comprising, from the object side, the following components in sequence: A first lens having positive refractive power and having its convex surface facing the object; A second lens with negative refractive power; A third lens with positive refractive power; A fourth lens with negative refractive power; A fifth lens with positive refractive power; A sixth lens with positive refractive power; A seventh lens with positive refractive power; as well as The eighth lens with negative refractive power and its concave surface facing the image side; The imaging lens assembly contains eight lenses with refractive power. The imaging lens assembly is configured to satisfy: 0.195>((m_fL_r3_si) – (m_fL_r2_si)) / 2 × (l_fL_r5_si) ×π>0.145, Fno=1.38, and 43.62° > HFOV > 38.5° Where m_fL_r2_si is the first direction cosine formed by the first off-axis ray in the tangential direction, the first off-axis ray is located at the off-axis end of the off-axis ray beam in the tangential direction, and the off-axis ray beam images within the image circle covering the effective pixel area on the imaging surface. m_fL_r3_si is the second direction cosine formed by the second off-axis ray in the tangential direction, and the second off-axis ray is located at one end of the off-axis ray bundle on the optical axis side in the tangential direction. l_fL_r5_si is the third off-axis ray cosine formed in the sagittal direction, wherein the third off-axis ray is located at one end of the sagittal direction in the off-axis ray bundle. Fno is the F-number, and HFOV is a half-field of view; The tangential direction is perpendicular to the optical axis and parallel to the tangential plane, the tangential plane including the optical axis and the principal ray in the off-axis ray beam, and the sagittal direction is perpendicular to the optical axis and the tangential direction.

2. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 0.955 <F1 / FL<1.8, Wherein, F1 is the focal length of the first lens, and FL is the focal length of the imaging lens assembly.

3. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 1.111 <F L1-L5 / FL<1.8, Among them, F L1-L5 FL is the combined focal length of the first lens to the fifth lens, and FL is the focal length of the imaging lens assembly.

4. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 3.657<∑ |FL / F (i)|<4.051, Wherein, FL is the focal length of the imaging lens assembly, F(i) is the focal length of the i-th lens, and the value of i ranges from 1 to 8.

5. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 1.634mm -1 <∑ |1 / Ri|<1.695mm -1 , Where Ri is the radius of curvature of the i-th lens surface from the object side, and the value of i ranges from 1 to 16.

6. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 2.071<TTL / D L1-L5 <2.197, Wherein, TTL is the length along the optical axis from the object-side surface of the first lens to the focal point of the imaging lens assembly, and D L1-L5 It is the distance between the object-side surface of the first lens and the image-side surface of the fifth lens on the optical axis.

7. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 1.370 <R3 / R4<1.497, Wherein, R3 is the radius of curvature of the object-side surface of the second lens, and R4 is the radius of curvature of the image-side surface of the second lens.

8. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 1.243 > R12 / R11 > 1.208 Wherein, R11 is the radius of curvature of the object-side surface of the sixth lens, and R12 is the radius of curvature of the image-side surface of the sixth lens.

9. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: -2.935 <R15 / R13<-1.781, Wherein, R13 is the radius of curvature of the object-side surface of the seventh lens, and R15 is the radius of curvature of the object-side surface of the eighth lens.

10. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 1.588<Nd L2 <1.75, Among them, Nd L2 It is the refractive index of the second lens at line d.

11. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 56.20>ν1>55.91, Where v1 is the Abbe number of the first lens.

12. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 19.25 < ν2 < 35, Where ν2 is the Abbe number of the second lens.

13. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: ν4=19.25, Wherein, ν4 is the Abbe number of the fourth lens.

14. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 19.25 < ν6 < 19.48, Wherein, ν6 is the Abbe number of the sixth lens.

15. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly is configured to satisfy: 1.441 <TTL / imgH<1.513, Where TTL is the length along the optical axis from the object-side surface of the first lens to the focal point of the imaging lens assembly, and imgH is the image height.

16. The imaging lens assembly according to claim 1, wherein, The eighth lens has an aspherical shape with an inflection point and is made of plastic.

17. A camera module, comprising: Imaging lens assembly according to any one of claims 1 to 16; and An image sensor including the imaging surface.

18. The camera module according to claim 17, wherein, The camera module includes a filter disposed between the imaging lens assembly and the image sensor.

19. An imaging device, comprising: The camera module according to claim 17 or the camera module according to claim 18; and a housing that accommodates the camera module.

20. The imaging device according to claim 19, wherein, The imaging device includes an imaging processing unit that performs noise reduction processing on the images captured by the image sensor.

Images