Optical lens unit, imaging module, and terminal device

Abstract

To provide an optical lens unit, an image-capturing module, and a terminal device.SOLUTION: An optical lens unit includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has negative refractive power, the second lens has positive refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has positive refractive power, and the sixth lens has negative refractive power. The optical lens unit satisfies the relational expression below: 6.5<TTL / IMGH<7.2;1.9<TTL / F<2.2, where TTL represents the distance in the optical axis from the object side face of the first lens to the image-forming face of the optical lens unit, IMGH represents half the image height corresponding to the maximum field angle of the optical lens unit, and F represents the focal distance of the optical lens unit. The optical lens unit according to the present invention helps provide high image-forming quality while materializing compact design.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of optical imaging technology, and in particular to an optical lens unit, an imaging module, and a terminal device. [Background technology]

[0002] In recent years, with the development of the automotive industry, the country has been increasing its requirements for road traffic safety and vehicle safety, and the application of ADAS (Advanced Driving Assistant System), DMS (Driver Monitoring System), and CMS (Crush Monitor System) in automotive driving has gradually become widespread. However, with the trend of miniaturization of optical lens units, how to improve the imaging quality of optical lens units is currently a technical problem that needs to be solved urgently. Summary of the Invention [Problem to be solved by the invention]

[0003] The embodiments of the present invention disclose an optical lens unit, an imaging module, and a terminal device, which can achieve a compact design of the optical lens unit while providing high imaging quality. [Means for solving the problem]

[0004] In order to achieve the above object, in a first aspect, the optical lens unit of the present invention has a total of six lenses having refractive power, including, in order from the object side to the image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, the first lens has negative refractive power, an object side surface of the first lens is a concave surface near an optical axis, and an image side surface of the first lens is a convex surface near the optical axis; the second lens has positive refractive power, an object side surface of the second lens is a convex surface near the optical axis, and an image side surface of the second lens is a convex surface near the optical axis; the third lens has positive refractive power, an object side surface of the third lens is a convex surface near the optical axis, and an image side surface of the third lens is a convex surface near the optical axis; the fourth lens has negative refractive power, an object side surface of the fourth lens is concave near the optical axis, and an image side surface of the fourth lens is concave near the optical axis; the fifth lens has positive refractive power, an object side surface of the fifth lens is a convex surface near the optical axis, and an image side surface of the fifth lens is a convex surface near the optical axis; the sixth lens has negative refractive power, an object side surface of the sixth lens is a concave surface near the optical axis, and an image side surface of the sixth lens is a convex surface near the optical axis; The optical lens unit has the following relationship: 6.5 <TTL / IMGH<7.2;1.9<TTL / F<2.2 Fulfilling the Here, TTL is the distance on the optical axis from the object side of the first lens to the image plane of the optical lens unit, IMGH is half the image height corresponding to the maximum field of view of the optical lens unit, and F is the focal length of the optical lens unit.

[0005] By imparting negative refractive power to the first lens of the optical lens unit, incident light rays at large angles can be incident on the optical lens unit, expanding the optical lens unit's field of view and achieving wide-angle characteristics. The object-side surface of the first lens is concave near the optical axis, and the image-side surface of the first lens is convex near the optical axis. This arrangement reduces the aperture and overall optical length of the optical lens unit, meeting the demand for compactness. The second and third lenses both have positive refractive power, allowing incident light rays passing through the first lens to enter the optical lens unit more gently, correcting off-axis aberrations, reducing the optical lens unit's sensitivity to changes in resolving power, and increasing the stability of the imaging effect of the optical lens unit, thereby improving the imaging quality of the optical lens unit. Furthermore, the object-side and image-side surfaces of both lenses are convex near the optical axis, allowing the second and third lenses to have strong positive refractive power, further shortening the overall optical length. The fourth lens is a negative lens, with its object-side and image-side surfaces concave near the optical axis, which prevents stray light and improves edge-relative illumination. The fifth lens has positive refractive power and its object-side and image-side surfaces convex near the optical axis, which corrects edge aberrations and improves the resolving power of the optical lens unit. The sixth lens has negative refractive power and its object-side surface is concave near the optical axis and its image-side surface is convex near the optical axis, which balances the difficult-to-correct aberrations that occur when the fifth lens converges incident light, reduces chromatic aberrations, and improves the imaging quality of the optical lens unit. Therefore, by selecting the appropriate number of lenses and rationally arranging the refractive power and surface shape of each lens, it is possible to achieve a compact design for the optical lens unit while correcting the field curvature and aberrations of the optical lens unit, thereby improving the resolution and imaging clarity of the optical lens unit. This allows the optical lens unit to provide a more precise imaging effect and meet people's demands for high-definition imaging.

[0006] In addition, by satisfying the relational expression 6.5 < TTL / IMGH < 7.2 for the optical lens unit, the ratio of the overall optical length to the image height of the optical lens unit is rationally arranged. While having good imaging quality, the overall optical length of the optical lens unit can be shortened to achieve a miniaturized design. If it exceeds the upper limit of the above relational expression, the overall optical length of the optical lens unit is too long, which is disadvantageous for realizing the miniaturized design. If it is below the lower limit of the above relational expression, the overall optical length of the optical system is too short, and the lens surface shape of the optical lens unit is likely to become complicated, the production yield of the optical lens unit decreases, at the same time the aberration correction ability of the optical lens unit decreases, and the imaging quality deteriorates.

[0007] At the same time, by satisfying the relational expression 1.9 < TTL / F < 2 for the optical lens unit, the focal length and the overall optical length of the optical lens unit are rationally controlled. Not only can the miniaturization of the optical lens unit be realized, but also the light rays can converge better on the imaging surface. If it exceeds the upper limit of the above relational expression, the overall optical length of the optical lens unit is too long compared with the focal length, the angle of the principal ray when the light rays enter the imaging surface becomes large, the edge rays of the optical lens unit cannot be imaged on the imaging surface, the imaging information becomes incomplete, the imaging quality deteriorates, and it is also disadvantageous for realizing the miniaturized design of the optical lens unit. If it is below the lower limit of the above relational expression, the overall length of the optical lens unit is too short compared with the focal length, the sensitivity of the optical lens unit is likely to increase, which is disadvantageous for the light rays to converge on the imaging surface.

[0008] In a second aspect, the present invention discloses an imaging module, which includes an image sensor and the optical lens unit described in the first aspect, and the image sensor is arranged on the image side of the optical lens unit. The imaging module equipped with this optical lens unit can achieve a miniaturized design while having high imaging quality.

[0009] In a third aspect, the present invention discloses a terminal device, which includes a fixing member and the imaging module described in the second aspect, and the imaging module is provided on the fixing member. The terminal device equipped with this imaging module can achieve a miniaturized design while having high imaging quality.

[0010] In order to more clearly describe the technical solutions in the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative work. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing the configuration of an optical lens unit disclosed in a first embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing longitudinal spherical aberration, astigmatism, and distortion of the optical lens unit disclosed in the first embodiment of the present invention. [Figure 3] FIG. 3 is a diagram showing the configuration of an optical lens unit disclosed in a second embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing longitudinal spherical aberration, astigmatism, and distortion of the optical lens unit disclosed in the second embodiment of the present invention. [Figure 5] FIG. 5 is a diagram showing the configuration of an optical lens unit disclosed in a third embodiment of the present invention. [Figure 6] FIG. 6 is a diagram showing the longitudinal spherical aberration, the astigmatism, and the distortion of the optical lens unit disclosed in the third embodiment of the present invention. [Figure 7] FIG. 7 is a diagram showing the configuration of an optical lens unit disclosed in a fourth embodiment of the present invention. [Figure 8] FIG. 8 is a diagram showing the longitudinal spherical aberration, the astigmatism, and the distortion of the optical lens unit disclosed in the fourth embodiment of the present invention. [Figure 9] FIG. 9 is a diagram showing the configuration of an optical lens unit disclosed in the fifth embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing the longitudinal spherical aberration, the astigmatism, and the distortion of the optical lens unit disclosed in the fifth embodiment of the present invention. [Figure 11] FIG. 11 is a diagram showing the configuration of an imaging module disclosed in the present invention. [Figure 12] FIG. 12 is a configuration diagram of a terminal device disclosed in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and are not all embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

[0013] In a first aspect, the present invention discloses an optical lens unit having six lenses with refractive power, which are arranged in order from the object side to the image side along the optical axis direction as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. During imaging, light rays are incident on the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens in that order from the object side of the first lens, and are finally imaged on an image plane of the optical lens unit.

[0014] Furthermore, the first lens has negative refractive power, the second lens has positive refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, the fifth lens has positive refractive power, and the sixth lens has negative refractive power.

[0015] Furthermore, the object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis. The object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is convex near the optical axis. The object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis. The object side surface of the fourth lens is concave near the optical axis, and the image side surface of the fourth lens is concave near the optical axis. The object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is convex near the optical axis. The object side surface of the sixth lens is concave near the optical axis, and the image side surface of the sixth lens is convex near the optical axis.

[0016] By imparting negative refractive power to the first lens of the optical lens unit, incident light rays at large angles can be incident on the optical lens unit, expanding the field of view of the optical lens unit and achieving wide-angle viewing characteristics. The first lens has a concave object-side surface near the optical axis and a convex image-side surface near the optical axis, which reduces the aperture and overall optical length of the optical lens unit and meets the demand for compactness. The second and third lenses both have positive refractive power, which allows incident light rays passing through the first lens to enter the optical lens unit more gently, correcting off-axis aberrations, reducing the sensitivity of the optical lens unit to changes in resolution, and improving the stability of the imaging effect of the optical lens unit, thereby improving the imaging quality of the optical lens unit. Furthermore, the convex object-side and image-side surfaces of both lenses near the optical axis allow the second and third lenses to have strong positive refractive power, further shortening the overall optical length. The fourth lens is a negative lens, with its object-side and image-side surfaces concave near the optical axis, which prevents stray light and improves edge-relative illumination. The fifth lens has positive refractive power and its object-side and image-side surfaces convex near the optical axis, which corrects edge aberrations and improves the resolving power of the optical lens unit. The sixth lens has negative refractive power and its object-side surface is concave near the optical axis and its image-side surface is convex near the optical axis, which balances the difficult-to-correct aberrations that occur when the fifth lens converges incident light, reduces chromatic aberrations, and improves the imaging quality of the optical lens unit. Therefore, by selecting the appropriate number of lenses and rationally arranging the refractive power and surface shape of each lens, it is possible to achieve a compact design for the optical lens unit while correcting the field curvature and aberrations of the optical lens unit, thereby improving the resolution and imaging clarity of the optical lens unit. This allows the optical lens unit to provide a more precise imaging effect and meet people's demands for high-definition imaging.

[0017] Furthermore, in some embodiments, the lenses may all be made of glass, which provides the optical lens unit with good optical performance and reduces the temperature drift sensitivity of the optical lens unit. In other embodiments, the lenses may all be made of plastic, which reduces the weight and cost of the optical lens unit. Alternatively, the materials of the lenses in the optical lens unit may be specifically selected according to actual needs. For example, all lenses may be made of plastic, all may be made of glass, or lenses of different materials may be mixed to provide the optical lens unit with low temperature drift sensitivity and a lighter overall weight. No specific limitations are provided herein.

[0018] In some embodiments, spherical lenses have a simple manufacturing process and low production costs, and can flexibly design the lens surface shape, thereby improving the imaging resolution of the optical lens unit. Aspherical lenses can more flexibly design the object side or image side of the lens, and can effectively solve problems such as unclear images, distorted vision, or narrow field of view, even when the lens is small and thin. Furthermore, the optical lens unit does not need to install an excessive number of lenses, providing good imaging quality and helping to shorten the length of the optical lens unit. Based on this, the third lens can be an aspherical lens, and the first, second, fourth, fifth, and sixth lenses can be spherical lenses. In this way, the combined design of spherical lenses and aspherical lenses not only improves the processability of each lens and is advantageous for surface design, but also allows for more flexible design of the object side or image side of the lens, and even if each lens is small and thin, it can effectively solve problems such as unclear images, distorted vision, or narrow field of view, so that the optical lens unit can have good imaging quality without installing an excessive number of lenses, and the length of the optical lens unit can be shortened. In other embodiments, the surfaces of each lens of the optical lens unit can be all spherical, all aspherical, or any combination of spherical and aspherical, and specific options can be selected according to actual needs, so no specific limitations are set forth in this embodiment.

[0019] In some embodiments, the optical lens unit further includes a stop. The stop may be an aperture stop and / or a field stop. For example, the stop may be an aperture stop, or the stop may be a field stop, or the stop may be an aperture stop and a field stop. By disposing the stop between the image-side surface of the first lens and the object-side surface of the second lens, the exit pupil can be moved away from the image plane, and the effective diameter of the optical lens unit can be reduced without reducing the centrifugal force of the optical lens unit, thereby achieving compactness. In other embodiments, the stop may be disposed between other lenses, and the setting can be adjusted according to actual conditions. This embodiment does not specifically limit this.

[0020] In some embodiments, the optical lens unit further includes a filter disposed between the sixth lens and the imaging plane of the optical lens unit. Optionally, the filter may be an infrared-cutting filter, which blocks infrared light and passes visible light, thereby enabling the imaging to better match the visual experience of the human eye and improving imaging quality. In other embodiments, the filter may be an infrared bandpass filter, which passes infrared light and reflects visible light, enabling the optical lens unit to achieve infrared imaging and achieve good imaging quality in low-light environments or special application scenarios. The filter may be made of plastic, optical glass coated, or other materials, and may be selected according to actual needs; no specific limitations are imposed in this embodiment.

[0021] In some embodiments, the optical lens unit further includes a protective glass, which is disposed between the filter and the imaging surface of the optical lens unit. Thereby, it can protect the image sensor and play a role in preventing dust. The protective glass may be made of plastic, or may be made by coating an optical glass, or may be a protective glass of other materials, and can be selected according to actual needs, and no specific limitation is imposed in this embodiment. As can be understood, the protective glass may be part of the optical lens unit, or may be removed from the optical lens unit. However, after the protective glass is removed, the overall optical length of the optical lens unit remains unchanged.

[0022] In some embodiments, the optical lens unit satisfies the relational expression: 6.5 < TTL / IMGH < 7.2. Here, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens unit, and IMGH is half of the image height corresponding to the maximum viewing angle of the optical lens unit.

[0023] By reasonably arranging the ratio of the overall optical length of the optical lens unit to the image height, while ensuring good imaging quality, it is advantageous to shorten the overall optical length of the optical lens unit, and miniaturized design can be realized. If it exceeds the upper limit of the relational expression, the overall optical length of the optical lens unit is too long, which is disadvantageous for realizing miniaturized design. If it is below the lower limit of the relational expression, the overall optical length of the optical system is too short, and the lens surface type of the optical lens unit is likely to become overly complex, which reduces the production yield rate of the optical lens unit. At the same time, it is likely to reduce the aberration correction ability of the optical lens unit, leading to a decline in imaging quality.

[0024] In some embodiments, the optical lens unit satisfies the relational expression: 1.9 < TTL / F < 2.2. Here, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens unit, and F is the focal length of the optical lens unit.

[0025] By reasonably controlling the focal length of the optical lens unit and the overall optical length of the optical lens unit, not only can the miniaturization of the optical lens unit be achieved, but it is also advantageous for better converging light rays onto the imaging surface. When exceeding the upper limit of the relational expression, the overall optical length of the optical lens unit is too long compared to the focal length of the optical lens unit, the angle of the chief ray where the light rays enter the imaging surface becomes large, the marginal rays of the optical lens unit cannot form an image on the imaging surface, the imaging information becomes incomplete, the imaging quality deteriorates, and it is also disadvantageous for realizing the miniaturized design of the optical lens unit. When falling below the lower limit of the relational expression, the overall length of the optical lens unit is too short compared to the focal length of the optical lens unit, it is easy to increase the sensitivity of the optical lens unit, and it is also disadvantageous for converging light rays onto the imaging surface.

[0026] In some embodiments, the optical lens unit satisfies the relational expression: 0.5 < CT23 / CT2 < 1.2. Here, CT2 is the thickness on the optical axis of the second lens, and CT23 is the distance on the optical axis between the second lens and the third lens.

[0027] By satisfying the relational expression, it is possible to effectively avoid the excessive increase of the air gap on the optical axis between the second lens and the third lens. On the one hand, it is advantageous for the aberration correction of this optical lens unit, thereby improving the imaging quality of the optical lens unit. On the other hand, it provides space for the rationality of the structure and molding of the ineffective diameter of the second lens, and ensures the overall feasibility in a small-sized lens barrel.

[0028] In some embodiments, the optical lens unit satisfies the relational expression: 0.8 < CT56 / CT6 < 3. Here, CT6 is the thickness on the optical axis of the sixth lens, and CT56 is the distance on the optical axis between the fifth lens and the sixth lens.

[0029] By satisfying the above relational expression, it is possible to effectively avoid the excessive increase of the air gap on the optical axis between the fifth lens and the sixth lens. On the other hand, this is advantageous for correcting the aberration of the optical lens unit, thereby improving the imaging quality of the optical lens unit. On the other hand, it provides space for the rationality of the structure and molding of the non-effective diameter of the sixth lens, and guarantees the overall feasibility in a small-sized lens barrel.

[0030] In some embodiments, the optical lens unit satisfies the relational expression: 1.5 < CT2 / ET2 < 2.1. Here, CT2 is the thickness on the optical axis of the second lens, and ET2 is the thickness of the edge of the second lens, that is, the distance in the optical axis direction from the position of the maximum effective aperture on the object side surface of the second lens to the position of the maximum effective aperture on the image side surface of the second lens.

[0031] By satisfying the above relational expression, the ratio of the thickness of the edge of the second lens can be reasonably controlled, and the difficulty of lens processing can be reduced. When exceeding the upper limit of the relational expression, the difference in the ratio of the thickness and thinness of the second lens becomes relatively large, and since it is a semi-lunar lens, the processing and molding of the lens become difficult. When falling below the lower limit of the relational expression, the difference in the ratio of the thickness and thinness of the second lens becomes relatively small, the light converging ability of the second lens decreases, thereby increasing the overall optical length of the optical lens unit, which is disadvantageous for the miniaturization of the optical lens unit.

[0032] In some embodiments, the optical lens unit satisfies the relational expression: 5 < SD3 / (SAG3 - SAG4) < 40. Here, SD3 is half of the maximum effective aperture on the object side surface of the second lens, SAG3 is the sagitta at the position of the maximum effective aperture on the object side surface of the second lens, that is, the distance in the optical axis direction from the intersection of the object side surface of the second lens and the optical axis to the position of the maximum effective aperture on the object side surface of the second lens, and SAG4 is the sagitta at the position of the maximum effective aperture on the image side surface of the second lens, that is, the distance in the optical axis direction from the intersection of the image side surface of the second lens and the optical axis to the position of the maximum effective aperture on the image side surface of the second lens.

[0033] By satisfying the relational expression, the surface shapes of the object side and the image side of the second lens are reasonably arranged, and aberrations can be corrected well. At the same time, the manufacturing and assembly tolerances of the second lens can be effectively controlled, the sensitivity of the assembly of the optical lens unit can be reduced, and the assembly yield rate of the optical lens unit can be improved.

[0034] In some embodiments, the optical lens unit satisfies the relational expression: 1.4 < F / F2345 < 1.8. Here, F is the focal length of the optical lens unit, and F2345 is the combined focal length of the second lens, the third lens, the fourth lens, and the fifth lens.

[0035] By reasonably setting the proportion of the combined focal length from the second lens to the fifth lens in the focal length of the entire optical lens unit, it is advantageous for correcting chromatic aberrations such as spherical aberration and field curvature of the optical lens unit, and the imaging quality of the optical lens unit can be improved.

[0036] In some embodiments, the optical lens unit satisfies the relational expression: 5 < |F34 / F| < 35. Here, F is the focal length of the optical lens unit, and F34 is the combined focal length of the third lens and the fourth lens.

[0037] By reasonably setting the ratio relationship between the combined focal length of the third lens and the fourth lens and the focal length of the optical lens unit, it is advantageous for correcting the aberrations generated by the lenses before the light passes through the fourth lens, and the resolution of the optical lens unit can be improved. At the same time, it is also advantageous for reducing the exit angle after the light is refracted through the optical lens unit, and the light is incident on the image sensor located on the image side of the imaging module at a small angle, thereby improving the photosensitive performance of the image sensor and the imaging quality of the imaging module.

[0038] In some embodiments, the optical lens unit satisfies the relational expression: 5 mm < F6 * BFL / R11 < 7 mm. Here, F6 is the combined focal length of the sixth lens, BFL is the distance on the optical axis from the image side surface of the sixth lens to the imaging surface of the optical lens unit, that is, the back focal length, and R11 is the radius of curvature on the optical axis of the object side surface of the sixth lens.

[0039] By reasonably setting the focal length of the sixth lens, the back focal length of the optical lens unit, and the radius of curvature of the object side surface of the sixth lens, the risk of ghost images caused by the object side surface of the sixth lens can be effectively reduced.

[0040] In some embodiments, the optical lens unit satisfies the relational expression: 1.1 < CT4 / CT3 < 1.9. Here, CT3 is the thickness on the optical axis of the third lens, and CT4 is the thickness on the optical axis of the fourth lens.

[0041] Reasonably setting the thicknesses on the optical axis of the third lens and the fourth lens and controlling the difference in their thicknesses within an appropriate range is beneficial for the adhesion of the third lens and the fourth lens, and can avoid phenomena such as cracks and peeling of the adhesive due to excessive deformation of the lens caused by an excessive difference in thickness in high-temperature and low-temperature environments.

[0042] In some embodiments, the optical lens unit satisfies the relational expression: 20 < VD3 - VD4 < 35. Here, VD3 is the Abbe number of the third lens, and VD4 is the Abbe number of the fourth lens.

[0043] By ensuring that both are within the above relational expression, the chromatic aberration of the optical lens unit can be effectively corrected, and the performance of the optical lens unit can be effectively improved.

[0044] In some embodiments, the optical lens unit has the relational expression: 0.2 mm * 10 -6 / ℃ < (CT3 - CT4) * (TCE3 - TCE4) < 0.8 mm * 10-6 satisfies / ℃. Here, CT3 is the thickness on the optical axis of the third lens, CT4 is the thickness on the optical axis of the fourth lens, TCE3 is the thermal expansion coefficient of the third lens, and TCE4 is the thermal expansion coefficient of the fourth lens.

[0045] By satisfying the above relational expression, the difference in the central thickness and the difference in the material between the third lens and the fourth lens can be reasonably set, which is advantageous for ensuring the imaging performance of the optical lens unit under high-temperature and low-temperature conditions.

[0046] Furthermore, adopting an arrangement method of bonding the third lens and the fourth lens and using one positive refractive power and one negative refractive power respectively is advantageous for the mutual correction of the aberrations of the optical lens unit. In some embodiments, the optical lens unit satisfies the relational expression: 1 < SD9 / SD11 < 1.1. Here, SD9 is half of the maximum effective aperture of the object side surface of the fifth lens, and SD11 is half of the maximum effective aperture of the object side surface of the sixth lens.

[0047] By satisfying the above relational expression, the ratio of the effective aperture of the object side surface of the fifth lens to the effective aperture of the object side surface of the sixth lens can be reasonably set, which is advantageous for the convergence and focusing of incident light rays, thereby being advantageous for shortening the overall length of the optical lens unit and realizing a miniaturized design. At the same time, it is also advantageous for the light rays in the sixth lens to spread towards the image side, thereby being advantageous for realizing the characteristic that the optical lens unit has a large image plane, being advantageous for the compatibility between the optical lens unit and the image sensor, and at the same time being advantageous for avoiding causing excessive aberrations.

[0048] In some embodiments, the optical lens unit satisfies the relational expression: -2.6 < SAG11 / SAG9 < -2.2. Here, SAG9 is the sagitta at the position of the maximum effective aperture of the object side surface of the fifth lens, that is, the distance in the optical axis direction from the intersection of the object side surface of the fifth lens and the optical axis to the position of the maximum effective aperture of the object side surface of the fifth lens, and SAG11 is the sagitta at the position of the maximum effective aperture of the object side surface of the sixth lens, that is, the distance in the optical axis direction from the intersection of the object side surface of the sixth lens and the optical axis to the position of the maximum effective aperture of the object side surface of the sixth lens. More preferably, the optical lens unit satisfies the relational expression: -2.5 < SAG11 / SAG9 < -2.3.

[0049] By satisfying the above relational expression, the difference in the curvature of the object side surfaces of the fifth lens and the sixth lens can be prevented from becoming excessive, and the aberrations such as spherical aberration and field curvature generated by the sixth lens by the front lens can be corrected better, and the optical lens unit can obtain a better imaging effect.

[0050] In some embodiments, the optical lens unit satisfies the relational expression: 1 < SD1 / IMGH < 1.3. Here, SD1 is half of the maximum effective aperture of the object side surface of the first lens, and IMGH is half of the image height corresponding to the maximum viewing angle of the optical lens unit. More preferably, the optical lens unit satisfies the relational expression: 1.05 < SD1 / IMGH < 1.22.

[0051] By reasonably setting the ratio of the maximum effective aperture of the object side surface of the first lens to the image height of the optical lens unit, the optical lens unit can be adapted to a larger image sensor under a smaller space limit, and the imaging quality of the optical lens unit can be improved. At the same time, due to the limitation by the above relational expression, the internal space of the first lens can be fully utilized, thereby improving the compactness of the optical lens unit and realizing the miniaturized design of the optical lens unit.

[0052] In some embodiments, the optical lens unit satisfies the relational expression: 15 mm < SD1 / TAN(FOV / 2) - SAG1 < 17.5 mm. Here, SD1 is half of the maximum effective aperture of the object side surface of the first lens, FOV is the maximum viewing angle of the optical lens unit, and SAG1 is the sagitta at the position of the maximum effective aperture of the object side surface of the first lens, that is, the distance in the optical axis direction from the intersection of the object side surface of the first lens and the optical axis to the position of the maximum effective aperture of the object side surface of the first lens.

[0053] By satisfying the above relational expression, the depth of view of the optical lens unit can be restricted, the blocking of light by the mechanism can be effectively avoided, and at the same time, the requirements of the viewing angle and the head aperture can be satisfied.

[0054] Define Fn as the effective focal length of the nth lens, CTn as the thickness on the optical axis of the nth lens, R2n - 1 as the radius of curvature on the optical axis of the object side surface of the nth lens, and R2n as the radius of curvature on the optical axis of the image side surface of the nth lens. Here, n is any integer from 1 to 6. Specifically, the effective focal length of the first lens is F1, the thickness on the optical axis of the first lens is CT1, the radius of curvature on the optical axis of the object side surface of the first lens is R1, and the radius of curvature on the optical axis of the image side surface of the first lens is R2. Similarly, the other lenses are defined in the same way below.

[0055] In some embodiments, the optical lens unit satisfies the relational expressions: 2.5 < R2 / R1 < 5, and / or, -2 < R4 / R3 < -1, and / or, -2 < R6 / R5 < -0.5, and / or, -2 < R7 / R8 < -1, and / or, -2.2 < R10 / R9 < -1.5, and / or, R12 / R11 < 30.

[0056] By controlling the ratio of the radii of curvature on the optical axis of the object side surface and the image side surface of the lens within a reasonable range, it is advantageous for controlling the surface shape of the lens, thereby being advantageous for correcting astigmatism, field curvature, and distortion of the optical lens unit, compressing the overall optical length of the optical lens unit, and realizing the design requirements of thinning and miniaturization of the optical lens unit.

[0057] In some embodiments, the optical lens unit satisfies the relational expression: 30deg < FOV < 40deg. Here, FOV is the maximum viewing angle of the optical lens unit. More preferably, the optical lens unit satisfies the relational expression: 33deg < FOV < 36deg.

[0058] By reasonably setting the maximum viewing angle of the optical lens unit, the shooting range of the screen of the optical lens unit can be effectively improved, which is advantageous for realizing the telephoto effect of the optical lens unit.

[0059] In some embodiments, the optical lens unit satisfies the relational expression: 1.5 < FNO < 1.7. Here, FNO is the aperture value of the optical lens unit. More preferably, the optical lens unit satisfies the relational expression: 1.55 < FNO < 1.65.

[0060] By reasonably arranging the aperture value of the optical lens unit, the optical lens unit can have a relatively large aperture, and the optical lens unit can have a good diffraction limit and excellent relative illuminance and resolution.

[0061] [[ID=十七]]In some embodiments, the optical lens unit satisfies the relational expressions: -7 < F1 / CT1 < -4.5, and / or, 2 < F2 / CT2 < 3.5, and / or, 2.5 < F3 / CT3 < 4, and / or, -2 < F4 / CT4 < -1, and / or, 5 < F5 / CT5 < 9, and / or, -30 < F6 / CT6 < -10.

[0062] By reasonably setting the ratio of the focal length of each lens to the thickness on the optical axis, the tolerance sensitivity within the optical lens unit with respect to the thickness of each lens on the optical axis can be reduced, thereby reducing the difficulty of the processing step of each lens, improving the assembly yield of the optical lens unit, and reducing the production cost.

[0063] ** The surface shape of each aspherical lens can be limited by, but not limited to, the following aspherical formula.

[0064]

number

[0065] Here, Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the distance from any point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, c=1 / Y, Y is the radius of curvature (i.e., the paraxial curvature c is the reciprocal of the Y radius in Table 1), k is the conic constant, and Ai is a coefficient corresponding to the higher-order term of the i-th term in the aspherical surface type formula.

[0066] The optical lens unit of the present invention will be described in detail below using specific parameters.

[0067] (First Example) 1 is a structural schematic diagram of an optical lens unit 100 disclosed in a first embodiment of the present invention. The optical lens unit 100 includes a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, which are arranged in this order from the object side to the image side along an optical axis O. Here, the materials related to the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are the same as those described in the specific embodiments above, and will not be described again here.

[0068] Furthermore, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power.

[0069] Furthermore, the object side surface S1 of the first lens is concave near the optical axis O, and the image side surface S2 of the first lens is convex near the optical axis O. The object side surface S3 of the second lens is convex near the optical axis O, and the image side surface S4 of the second lens is convex near the optical axis O. The object side surface S5 of the third lens is convex near the optical axis O, and the image side surface S6 of the third lens is convex near the optical axis O. The object side surface S7 of the fourth lens is concave near the optical axis O, and the image side surface S8 of the fourth lens is concave near the optical axis O. The object side surface S9 of the fifth lens is convex near the optical axis O, and the image side surface S10 of the fifth lens is convex near the optical axis O. The object side surface S11 of the sixth lens is concave near the optical axis O, and the image side surface S12 of the sixth lens is concave near the optical axis O.

[0070] Specifically, Table 1 shows other parameters of the optical lens unit 100, taking as an example the focal length F of the optical lens unit 100 of 15.25 mm, the aperture value FNO of the optical lens unit 100 of 1.6, the maximum field of view FOV of the optical lens unit 100 of 33.2 deg, and the total optical length TTL of the optical lens unit 100 of 33.069 mm. Here, the elements of the optical lens unit 100, arranged from the object side to the image side along the optical axis O, are arranged in the order of the elements from top to bottom in Table 1. For the same lens, the surface with the smaller surface number is the object-side surface of that lens, and the surface with the larger surface number is the image-side surface of that lens. For example, surface numbers 1 and 2 correspond to the object-side surface S1 of the first lens and the image-side surface S2 of the first lens, respectively. The Y radius in Table 1 is the radius of curvature of the object-side or image-side surface of the corresponding surface number on the optical axis O. The first value in the "Thickness" parameter column for a lens is the thickness of that lens on the optical axis O, and the second value is the distance on the optical axis O from the image side surface of that lens to the next surface. The value in the "Thickness" parameter column for the STO aperture is the distance on the optical axis O from the STO aperture to the apex of the next surface (the apex refers to the intersection of the surface and the optical axis O). By default, the direction from the object side surface S1 of the first lens to the image side surface of the last lens is taken as the positive direction of the optical axis O. A negative value indicates that the STO aperture is located on the image side of the apex of the next surface, and a positive value for the STO aperture thickness indicates that the STO aperture is located on the object side of the apex of the next surface. As will be understood, the units of Y radius, thickness, and focal length in Table 1 are all in mm, and the refractive index and Abbe number in Table 1 are all obtained at a reference wavelength of 587.56 nm, and the reference wavelength for focal length is 555 nm.

[0071] In Table 2, k is a conic constant, and Table 2 shows the high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical mirror surface in the first embodiment.

[0072] [Table 1]

[0073] [Table 2] Referring to Figure 2A, Figure 2A shows the vertical spherical aberration diagram of the optical lens unit 100 in the first embodiment at wavelengths of 660 nm, 610 nm, 555 nm, 510 nm, 455 nm, and 420 nm. Here, the horizontal axis in the X-axis direction represents the focus deviation in mm, and the vertical axis in the Y-axis direction represents the normalized field of view. As can be seen from Figure 2A, the spherical aberration values ​​of the optical lens unit 100 in the first embodiment are relatively good, indicating that the imaging quality of the optical lens unit 100 in this embodiment is good.

[0074] Referring to Figure 2(B), Figure 2(B) shows an astigmatism diagram for the optical lens unit 100 in the first embodiment at a wavelength of 555 nm. Here, the horizontal axis in the X-axis direction represents defocus in mm, and the vertical axis in the Y-axis direction represents image height in mm. In the astigmatism diagram, T represents the curvature of the image plane IMG in the sub-arc direction, and S represents the curvature of the image plane IMG in the sagittal direction. As can be seen from Figure 2(B), at this wavelength, the astigmatism of the optical lens unit 100 is relatively well compensated for. Referring to Figure 2(C), Figure 2(C) shows a distortion curve diagram for the optical lens unit 100 in the first embodiment at a wavelength of 555 nm. Here, the horizontal axis along the X axis represents distortion, and the vertical axis along the Y axis represents image height, in units of mm. As can be seen from Figure 2(C), at this wavelength, the distortion of the optical lens unit 100 is corrected relatively well.

[0075] (Second Example) 3 is a structural schematic diagram of an optical lens unit 100 disclosed in a second embodiment of the present invention. The optical lens unit 100 includes, in order from the object side to the image side along the optical axis O, a first lens L1, an aperture stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The materials used for these lenses are the same as those described in the above specific embodiments and will not be repeated here. Furthermore, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power.

[0076] Furthermore, the object side surface S1 of the first lens is concave near the optical axis O, and the image side surface S2 of the first lens is convex near the optical axis O. The object side surface S3 of the second lens is convex near the optical axis O, and the image side surface S4 of the second lens is convex near the optical axis O. The object side surface S5 of the third lens is convex near the optical axis O, and the image side surface S6 of the third lens is convex near the optical axis O. The object side surface S7 of the fourth lens is concave near the optical axis O, and the image side surface S8 of the fourth lens is concave near the optical axis O. The object side surface S9 of the fifth lens is convex near the optical axis O, and the image side surface S10 of the fifth lens is convex near the optical axis O. The object side surface S11 of the sixth lens is concave near the optical axis O, and the image side surface S12 of the sixth lens is concave near the optical axis O.

[0077] Specifically, an example will be given in which the focal length F of the optical lens unit 100 is 15.24 mm, the aperture value FNO of the optical lens unit 100 is 1.6, the maximum field of view FOV of the optical lens unit 100 is 35.4 deg, and the total optical length TTL of the optical lens unit 100 is 33.163 mm. The refractive indexes and Abbe numbers shown in Table 3 are all obtained at a reference wavelength of 587.56 nm, and the reference wavelength for the focal length is 558 nm. Other parameters in this second example are as shown in Tables 3 and 4 below, and the definitions of each parameter can be obtained from the explanations of the previous examples, so they will not be repeated here.

[0078] [Table 3]

[0079] [Table 4] Referring to Figure 4(A), Figure 4(A) shows the vertical spherical aberration diagram of the optical lens unit 100 of the second embodiment at wavelengths of 700 nm, 614 nm, 558 nm, 502 nm, 455 nm, and 410 nm. Here, the horizontal axis along the X axis represents the focus deviation in mm, and the vertical axis along the Y axis represents the normalized field of view. As can be seen from Figure 4(A), the spherical aberration values ​​of the optical lens unit 100 of the second embodiment are relatively good, indicating that the imaging quality of the optical lens unit 100 of this embodiment is good.

[0080] Referring to Figure 4(B), Figure 4(B) shows an astigmatism diagram for the optical lens unit 100 in the second embodiment at a wavelength of 558 nm. Here, the horizontal axis in the X-axis direction represents defocus in mm, and the vertical axis in the Y-axis direction represents image height in mm. In the astigmatism diagram, T represents the curvature of the image plane IMG in the sub-arc direction, and S represents the curvature of the image plane IMG in the sagittal direction. As can be seen from Figure 4(B), at this wavelength, the astigmatism of the optical lens unit 100 is relatively well compensated. Referring to Figure 4(C), Figure 4(C) shows a distortion curve diagram for the optical lens unit 100 in the second embodiment at a wavelength of 558 nm. Here, the horizontal axis along the X axis represents distortion, and the vertical axis along the Y axis represents image height, in mm. As can be seen from Figure 4(C), at this wavelength, the distortion of the optical lens unit 100 is corrected relatively well.

[0081] (Third Example) 5 is a structural schematic diagram of an optical lens unit 100 disclosed in a third embodiment of the present invention. The optical lens unit 100 includes, in order from the object side to the image side along the optical axis O, a first lens L1, an aperture stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The materials used for these lenses are the same as those described in the above specific embodiments and will not be repeated here.

[0082] Furthermore, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power.

[0083] Furthermore, the object side surface S1 of the first lens is concave near the optical axis O, and the image side surface S2 of the first lens is convex near the optical axis O. The object side surface S3 of the second lens is convex near the optical axis O, and the image side surface S4 of the second lens is convex near the optical axis O. The object side surface S5 of the third lens is convex near the optical axis O, and the image side surface S6 of the third lens is convex near the optical axis O. The object side surface S7 of the fourth lens is concave near the optical axis O, and the image side surface S8 of the fourth lens is concave near the optical axis O. The object side surface S9 of the fifth lens is convex near the optical axis O, and the image side surface S10 of the fifth lens is convex near the optical axis O. The object side surface S11 of the sixth lens is concave near the optical axis O, and the image side surface S12 of the sixth lens is concave near the optical axis O.

[0084] Specifically, an example will be given in which the focal length F of the optical lens unit 100 is 15.25 mm, the aperture value FNO of the optical lens unit 100 is 1.6, the maximum field of view FOV of the optical lens unit 100 is 34.4 deg, and the total optical length TTL of the optical lens unit 100 is 30.46 mm. Other parameters in this third embodiment are as shown in Tables 5 and 6 below, and the definitions of each parameter can be obtained from the explanations of the previous embodiments, so they will not be repeated here.

[0085] [Table 5]

[0086] [Table 6] 6, as can be seen from the longitudinal spherical aberration diagram in Fig. 6(A), the astigmatism diagram in Fig. 6(B), and the distortion diagram in Fig. 6(C), the longitudinal spherical aberration, astigmatism, and distortion of the optical lens unit 100 in the third embodiment are all well controlled, and the optical lens unit 100 in this embodiment has good imaging quality. Furthermore, for the wavelengths corresponding to the curves in Fig. 6(A), Fig. 6(B), and Fig. 6(C), reference can be made to the contents of Fig. 4(A), Fig. 4(B), and Fig. 4(C) in the second embodiment, which will not be repeated here.

[0087] (Fourth Example) 7 is a structural schematic diagram of an optical lens unit 100 disclosed in a fourth embodiment of the present invention. The optical lens unit 100 includes, in order from the object side to the image side along the optical axis O, a first lens L1, an aperture stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The materials used are as described in the above specific embodiments and will not be repeated here.

[0088] Furthermore, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power.

[0089] Furthermore, the object side surface S1 of the first lens is concave near the optical axis O, and the image side surface S2 of the first lens is convex near the optical axis O. The object side surface S3 of the second lens is convex near the optical axis O, and the image side surface S4 of the second lens is convex near the optical axis O. The object side surface S5 of the third lens is convex near the optical axis O, and the image side surface S6 of the third lens is convex near the optical axis O. The object side surface S7 of the fourth lens is concave near the optical axis O, and the image side surface S8 of the fourth lens is concave near the optical axis O. The object side surface S9 of the fifth lens is convex near the optical axis O, and the image side surface S10 of the fifth lens is convex near the optical axis O. The object side surface S11 of the sixth lens is concave near the optical axis O, and the image side surface S12 of the sixth lens is concave near the optical axis O.

[0090] Specifically, an example will be given in which the focal length F of the optical lens unit 100 is 15.25 mm, the aperture value FNO of the optical lens unit 100 is 1.6, the maximum field of view FOV of the optical lens unit 100 is 34.32 deg, and the total optical length TTL of the optical lens unit 100 is 30.596 mm. Other parameters in this fourth embodiment are as shown in Tables 7 and 8 below, and the definitions of each parameter can be obtained from the explanations of the previous embodiments, so they will not be repeated here.

[0091] [Table 7]

[0092] [Table 8] Referring to Figure 8(A), Figure 8(A) shows the vertical spherical aberration diagram of the optical lens unit 100 of the fourth embodiment at wavelengths of 700 nm, 614 nm, 558 nm, 502 nm, 455 nm, and 410 nm. Here, the horizontal axis in the X-axis direction represents the focus deviation in mm, and the vertical axis in the Y-axis direction represents the normalized field of view. As can be seen from Figure 8(A), the spherical aberration values ​​of the optical lens unit 100 of the fourth embodiment are good, indicating that the imaging quality of the optical lens unit 100 of this embodiment is good.

[0093] Referring to FIG. 8(B), FIG. 8(B) shows an astigmatism diagram for the optical lens unit 100 of the fourth embodiment at a wavelength of 558 nm. Here, the horizontal axis in the X-axis direction represents the focus deviation in mm, and the vertical axis in the Y-axis direction represents the field of view in degrees. In the astigmatism diagram, T represents the curvature of the image plane IMG in the sub-arc direction, and S represents the curvature of the image plane IMG in the arc arrow direction. As can be seen from FIG. 8(B), the astigmatism of the optical lens unit 100 is well compensated for at that wavelength.

[0094] Referring to (C) of Figure 8, (C) of Figure 8 shows a distortion diagram of the optical lens unit 100 of the first embodiment at a wavelength of 558 nm. Here, the abscissa along the X axis represents distortion, and the ordinate along the Y axis represents image height, both in mm. As can be seen from (C) of Figure 8, the distortion of the optical lens unit 100 is well corrected at that wavelength.

[0095] (Fifth Example) 9 is a structural schematic diagram of an optical lens unit 100 disclosed in a fifth embodiment of the present invention. The optical lens unit 100 includes, in order from the object side to the image side along the optical axis O, a first lens L1, an aperture stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The materials used are as described in the above specific embodiments and will not be repeated here. Furthermore, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power.

[0096] Furthermore, the object side surface S1 of the first lens is concave near the optical axis O, and the image side surface S2 of the first lens is convex near the optical axis O. The object side surface S3 of the second lens is convex near the optical axis O, and the image side surface S4 of the second lens is convex near the optical axis O. The object side surface S5 of the third lens is convex near the optical axis O, and the image side surface S6 of the third lens is convex near the optical axis O. The object side surface S7 of the fourth lens is concave near the optical axis O, and the image side surface S8 of the fourth lens is concave near the optical axis O. The object side surface S9 of the fifth lens is convex near the optical axis O, and the image side surface S10 of the fifth lens is convex near the optical axis O. The object side surface S11 of the sixth lens is concave near the optical axis O, and the image side surface S12 of the sixth lens is concave near the optical axis O.

[0097] Specifically, an example will be given in which the focal length F of the optical lens unit 100 is 15.23 mm, the aperture value FNO of the optical lens unit 100 is 1.6, the maximum field of view FOV of the optical lens unit 100 is 34.32 deg, and the total optical length TTL of the optical lens unit 100 is 31.771 mm. Other parameters in this fifth embodiment are as shown in Tables 9 and 10 below, and the definitions of each parameter can be obtained from the explanations of the previous embodiments, so they will not be repeated here.

[0098] [Table 9]

[0099] [Table 10] 10, as can be seen from the longitudinal spherical aberration diagram in Fig. 10(A), the astigmatism diagram in Fig. 10(B), and the distortion diagram in Fig. 10(C), the longitudinal spherical aberration, astigmatism, and distortion of the optical lens unit 100 in the fifth embodiment are all well controlled, and the optical lens unit 100 in this embodiment has good imaging quality. Furthermore, for the wavelengths corresponding to the curves in Fig. 10(A), Fig. 10(B), and Fig. 10(C), reference can be made to the contents of Fig. 8(A), Fig. 8(B), and Fig. 8(C) in the fourth embodiment, which will not be repeated here.

[0100] Referring to Table 11, Table 11 is a summary table of the ratios of the respective relational expressions in the first to fifth embodiments of the present invention.

[0101] [Table 11] Referring to Fig. 11, as a second aspect, the present invention also discloses an imaging module 200. The imaging module includes an image sensor 201 and the optical lens unit 100 described in any one of the first to fifth embodiments of the first aspect, where the image sensor 201 is provided on the image side of the optical lens unit 100. The optical lens unit 100 is used to receive an optical signal of an object and project it onto the image sensor 201, and the image sensor 201 is used to convert the optical signal corresponding to the object into an image signal, and detailed description thereof will be omitted here. As can be seen, the imaging module 200 including the optical lens unit 100 can achieve a compact design while maintaining high imaging quality.

[0102] Referring to FIG. 12 , as a third aspect, the present invention also discloses a terminal device 400. The terminal device 400 includes a housing 401 and the imaging module 200 described in the second aspect, with the imaging module 200 disposed in the housing 401. The terminal device 400 can be applied to various devices, including but not limited to mobile phones, tablet computers, laptops, smartwatches, monitors, drive recorders, and backup cameras (reverse cameras). As can be seen, the terminal device 400 including the imaging module 200 also has all the technical effects of the optical lens unit described above, i.e., it can achieve a compact design while simultaneously achieving high imaging quality.

[0103] In various embodiments of the present invention, the magnitude of the numbers of the above-mentioned processes does not indicate the order of execution, and the execution order of each process is determined by its function and inherent logic, and does not constitute any limitation on the implementation process of the embodiments of the present invention.

[0104] The above examples are only used to explain the technical solutions of the present invention, and are not intended to limit the same. Although the present invention has been described in detail with reference to the above examples, those skilled in the art may still modify the technical solutions described in the above examples or substitute some technical features therein. These modifications or substitutions do not deviate from the essence of the corresponding technical solutions and the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical lens unit comprising a lens group, the lens group being composed of a total of six lenses each having refractive power, the six lenses being composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, which are arranged in this order from the object side to the image side along an optical axis; the first lens has negative refractive power, an object side surface of the first lens is a concave surface near an optical axis, and an image side surface of the first lens is a convex surface near the optical axis; the second lens has positive refractive power, an object side surface of the second lens is a convex surface near the optical axis, and an image side surface of the second lens is a convex surface near the optical axis; the third lens has positive refractive power, an object side surface of the third lens is a convex surface near the optical axis, and an image side surface of the third lens is a convex surface near the optical axis; the fourth lens has negative refractive power, an object side surface of the fourth lens is concave near the optical axis, and an image side surface of the fourth lens is concave near the optical axis; the fifth lens has positive refractive power, an object side surface of the fifth lens is a convex surface near the optical axis, and an image side surface of the fifth lens is a convex surface near the optical axis; the sixth lens has negative refractive power, an object side surface of the sixth lens is a concave surface near the optical axis, and an image side surface of the sixth lens is a convex surface near the optical axis; The optical lens unit satisfies the following formulas (1) and (2): 6.5<TTL / IMGH<7.2 (1) 1.9<TTL / F<2.2 (2) an optical lens unit, characterized in that TTL is a distance on the optical axis from the object side surface of the first lens to an image plane of the optical lens unit, IMGH is half of an image height corresponding to a maximum field of view of the optical lens unit, and F is a focal length of the optical lens unit.

2. 2. The optical lens unit according to claim 1, The optical lens unit satisfies at least one of the following formulas (3) and (4): 0.5<CT23 / CT2<1.2 (3) 0.8<CT56 / CT6<3 (4) An optical lens unit characterized in that CT2 is the thickness of the second lens on the optical axis, CT23 is the distance between the second lens and the third lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, and CT56 is the distance between the fifth lens and the sixth lens on the optical axis.

3. 2. The optical lens unit according to claim 1, The optical lens unit satisfies at least one of the following formulas (5) and (6): 1.5<CT2 / ET2<2.1 (5) 5<SD3 / (SAG3-SAG4)<40 (6) an optical lens unit characterized in that CT2 is the thickness of the second lens on the optical axis, ET2 is the edge thickness of the second lens, SD3 is half the maximum effective aperture of the object-side surface of the second lens, SAG3 is the arrow height at the maximum effective aperture of the object-side surface of the second lens, and SAG4 is the arrow height at the maximum effective aperture of the image-side surface of the second lens.

4. 2. The optical lens unit according to claim 1, The optical lens unit satisfies at least one of the following formulas (7), (8), and (9): 1.4<F / F2345<1.8 (7) 5<|F34 / F|<35 (8) 5mm<F6×BFL / R11<7mm (9) an optical lens unit characterized in that F2345 is a composite focal length of the second lens, the third lens, the fourth lens, and the fifth lens, F34 is a composite focal length of the third lens and the fourth lens, F6 is a focal length of the sixth lens, BFL is a distance on the optical axis from the image side surface of the sixth lens to an image forming plane of the optical lens unit, and R11 is a radius of curvature on the optical axis of the object side surface of the sixth lens.

5. 2. The optical lens unit according to claim 1, The optical lens unit satisfies at least one of the following formulas (10), (11), and (12): 1.1<CT4 / CT3<1.9 (10) 20<VD3-VD4<35 (11) 0.2mm×10 -6 / ℃<(CT3-CT4)×(TCE3-TCE4)<0.8mm×10 -6 / ℃ (12) an optical lens unit characterized in that CT3 is a thickness on the optical axis of the third lens, CT4 is a thickness on the optical axis of the fourth lens, VD3 is an Abbe number of the third lens, VD4 is an Abbe number of the fourth lens, TCE3 is a thermal expansion coefficient of the third lens, and TCE4 is a thermal expansion coefficient of the fourth lens.

6. 2. The optical lens unit according to claim 1, The optical lens unit satisfies at least one of the following formulas (13) and (14): 1<SD9 / SD11<1.1 (13) -2.6<SAG11 / SAG9<-2.2 (14) an optical lens unit characterized in that SD9 is half the maximum effective aperture of the object-side surface of the fifth lens, SD11 is half the maximum effective aperture of the object-side surface of the sixth lens, SAG9 is the arrow height at the maximum effective aperture of the object-side surface of the fifth lens, and SAG11 is the arrow height at the maximum effective aperture of the object-side surface of the sixth lens.

7. 2. The optical lens unit according to claim 1, The optical lens unit satisfies at least one of the following formulas (15) and (16): 1<SD1 / IMGH<1.3 (15) 15mm<SD1 / TAN(FOV / 2)-SAG1<17.5mm (16) An optical lens unit characterized in that SD1 is half of the maximum effective aperture of the object side of the first lens, FOV is the maximum field of view of the optical lens unit, and SAG1 is the arrow height at the maximum effective aperture of the object side of the first lens.

8. 2. The optical lens unit according to claim 1, The optical lens unit satisfies at least one of the following formulas (17), (18), and (19): -2<R6 / R5<-0.5 (17) -2<R7 / R8<-1 (18) R12 / R11<30 (19) an optical lens unit characterized in that R5 is a radius of curvature on the optical axis of the object-side surface of the third lens, R6 is a radius of curvature on the optical axis of the image-side surface of the third lens, R7 is a radius of curvature on the optical axis of the object-side surface of the fourth lens, R8 is a radius of curvature on the optical axis of the image-side surface of the fourth lens, R11 is a radius of curvature on the optical axis of the object-side surface of the sixth lens, and R12 is a radius of curvature on the optical axis of the image-side surface of the sixth lens.

9. 9. An imaging module comprising: an image sensor; and the optical lens unit according to claim 1, wherein the image sensor is disposed on an image side of the optical lens unit.

10. 10. A terminal device comprising: a fixed member; and the imaging module according to claim 9, wherein the imaging module is provided on the fixed member.

Images