An optical lens assembly

Abstract

The present invention discloses an optical lens assembly. The lens assembly includes a first lens, a second lens, an aperture, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a filter in sequence from the object side to the image side along its optical axis. The first, second, fourth and sixth lenses have positive refractive power; the third, fifth and seventh lenses have negative refractive power; and among the seven lenses, at least one of all the object side surfaces and the image side surfaces is aspherical. The optical lens assembly satisfies the following relationship: (1) 1.00<TTl / f<1.65; (2) ‑1≤(CT1+CT3) / (CT1‑CT3)≤15.5; (3) |f / f7|<1.589. The optical lens assembly of the present invention is a seven-lens type. The surface structure of each lens is combined with the optimization range of optical parameters, which can effectively shorten the overall length of the optical lens assembly and improve its lens viewing angle while maintaining high imaging quality. It has high resolution brought by high pixels, so that it can be provided for use in small or thin portable devices that need to be equipped with high imaging quality equipment.

Description

Technical field:

[0001] The invention patent relates to the technical field of photographic lens products, and in particular to an optical lens assembly. Background technology:

[0002] With the development of science and technology, the functions of various digital products are increasing day by day. For example, many digital products (such as various mobile terminals and mobile phones) are integrated with camera lens components. However, with the continuous updating of products, consumers' requirements for the camera quality of digital products are also advancing with the times.

[0003] In recent years, with the vigorous development of miniaturized camera lenses, the demand for small imaging modules has been increasing. With the improvement of semiconductor process technology, the pixel size of photosensitive elements has been reduced. In addition, the development trend of electronic products nowadays is to have good functions and a thin and short appearance. Therefore, miniaturized camera lenses with good imaging quality have become the mainstream in the current market. At the same time, with the rapid development of technology, the application scope of camera modules has become increasingly diverse. As portable electronic devices develop towards multifunctionality, the requirements for the imaging quality of the camera modules they carry have also increased, and the volume restrictions on camera modules have also become more stringent.

[0004] However, the existing camera module with six lenses is difficult to meet the current market requirements for image quality, so a camera module with seven lenses is needed to meet the current high standard of image quality. However, the camera module with seven lenses is not easy to meet the size limit of portable electronic devices. Therefore, in order to meet the market demand, it is necessary to provide a miniature camera module with high image quality.

[0005] Invention patent content:

[0006] The technical problem to be solved by the patent of this invention is to overcome the shortcomings of the prior art and provide an optical lens assembly with seven lenses.

[0007] In order to solve the above technical problems, the patent of the present invention adopts the following technical solutions: an optical lens assembly, which includes in sequence along its optical axis from the object side to the image side: a first lens with positive refractive power, whose object side surface and image side surface are both aspherical; a second lens, whose object side surface is convex near the optical axis, and whose image side surface is concave near the optical axis; an aperture, which is located on one side of the image side surface of the second lens; a third lens with negative refractive power, whose object side surface is convex near the optical axis, and whose image side surface is concave near the optical axis; a fourth lens with positive refractive power, whose object side surface is convex near the optical axis, and whose image side surface is convex near the optical axis; a fourth lens with negative refractive power, whose object side surface is convex near the optical axis, and whose image side surface is convex near the optical axis; A fifth lens with positive refractive power, whose object side surface is concave near the optical axis, and whose image side surface is convex near the optical axis; a sixth lens with positive refractive power, whose object side surface is convex near the optical axis; a seventh lens with negative refractive power, whose object side surface is concave near the optical axis, and whose image side surface is concave near the optical axis, and whose image side surface has at least one curve inflection point in the area far from the optical axis; and a filter and an imaging surface, wherein the filter is located between the seventh lens and the imaging surface; the optical lens assembly satisfies the following relationships: (1) 1.00<TTl / f<1.65; (2) -1≤(CT1+CT3) / (CT1-CT3)≤15.5; (3) |f / f7|<1.589.

[0008] Furthermore, in the above technical solution, the second lens has positive refractive power; the image-side surface of the sixth lens is convex near the optical axis, and both the object-side surface and the image-side surface are aspherical.

[0009] Furthermore, in the above technical solution, the lens assembly also satisfies the following conditions: (3) |R11 / R12|<1.9; (4) f / f1≤0.4.

[0010] Furthermore, in the above technical solution, the lens assembly also satisfies the following condition: (5) f34 / f<4.20.

[0011] Furthermore, in the above technical solution, the lens assembly also satisfies the following condition: (6) 0.8<CT2 / (CT1+CT3)<1.7.

[0012] Furthermore, in the above technical solution, the lens assembly also satisfies the following conditions: 7) 0.4<|f / f6|+|f / f7|<3.5.

[0013] Furthermore, in the above technical solution, the lens assembly also satisfies the following condition: (8) -50<(CT6+ET6) / (CT6-ET6)≤5.5.

[0014] Furthermore, in the above technical solution, the lens assembly also satisfies the following conditions: (9) 0.7≤LCT14 / LCT57≤1.3.

[0015] Furthermore, in the above technical solution, the lens assembly also satisfies the following condition (10) 1.5<V1 / V3<3.0.

[0016] Furthermore, in the above technical solution, the aperture value Fno of the lens assembly is less than 1.65.

[0017] In the above technical solution, the contents represented by each parameter in the corresponding condition are described below.

[0018] The patent of this invention is aimed at the current high-standard imaging quality requirements and has the characteristics of large aperture. The imaging lens of the patent of this invention is a seven-lens type. The surface structure of each lens is combined with the optimization range of optical parameters. It can effectively shorten the overall length of the imaging lens and improve its lens viewing angle while maintaining high imaging quality. It has high resolution brought by high pixels, so it can be used in small or thin portable devices that need to be equipped with high imaging quality equipment.

[0019] Compared with the current similar products with seven lenses, it has the following advantages: its overall volume (along the optical axis) can be further compressed, which can not only meet the needs of miniaturized wide-angle lenses, but also ensure high imaging quality. The patent of this invention adopts appropriate optical lens structure and lens layout to make the light pass through the lens more smoothly, the correction of aberration is more reasonable, the image distortion is small, the clarity is high, and it can ensure that the pictures taken are clear, colorful, and rich in layers while taking into account wide angle and large aperture. Description of the drawings:

[0020] Figure 1 It is a structural schematic diagram of the first embodiment of the present invention;

[0021] Figure 2 This is a specification parameter table of the lens assembly in the first embodiment of the present invention;

[0022] Figure 3 is the aspheric coefficient of the first embodiment of the present invention;

[0023] Figure 4 It is a field curvature and distortion diagram of the first embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the second embodiment of the present invention;

[0025] Figure 6 This is a specification parameter table of the lens assembly in the second embodiment of the present invention;

[0026] Figure 7 is the aspheric coefficient of the second embodiment of the present invention;

[0027] Figure 8 It is the field curvature and distortion diagram of the second embodiment of the present invention;

[0028] Fig. 9 It is a schematic diagram of the structure of the third embodiment of the present invention;

[0029] Fig.10 This is a specification parameter table of the lens assembly in the third embodiment of the present invention;

[0030] Fig.11 is the aspheric coefficient of the third embodiment of the present invention;

[0031] Fig.12 It is the field curvature and distortion diagram of the third embodiment of the present invention;

[0032] Fig.13 It is a schematic diagram of the structure of the fourth embodiment of the present invention;

[0033] Fig.14 This is a specification parameter table of the lens assembly in the fourth embodiment of the present invention;

[0034] Fig.15 is the aspheric coefficient of the fourth embodiment of the present invention;

[0035] Fig.16 It is a field curvature and distortion diagram of the fourth embodiment of the present invention; Specific implementation method:

[0036] Example 1

[0037] The present invention is a photographic lens assembly used in digital products. Figure 1-Figure 4 As shown, this is embodiment 1 of the patent of the present invention.

[0038] See Figure 1 As shown, the photographic lens assembly includes, in sequence along its optical axis from the object side 10 to the image side 11 (from left to right): a first lens 1, a second lens 2, an aperture 8, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, and a filter 9.

[0039] The first lens 1 is a lens with positive refractive power, and its object side surface and image side surface are both aspherical. The object side surface of the first lens 1 adopts an anti-curved surface design, which can effectively converge off-axis light, so that the angle at which it is incident on the photosensitive element is more consistent with the angle preset by the chip, and can further correct the aberration of the off-axis field of view.

[0040] The second lens 2 is a lens with positive refractive power, whose object-side surface near the optical axis is convex, and whose image-side surface near the optical axis is concave.

[0041] The third lens 3 is a lens with negative refractive power, the surface of which on the object side is convex near the optical axis, and the surface of which on the image side is concave near the optical axis.

[0042] The fourth lens 4 is a lens with positive refractive power, and its object-side surface is convex near the optical axis, and its image-side surface is convex near the optical axis.

[0043] The fifth lens 5 is a lens with negative refractive power, whose object side surface is concave near the optical axis and whose image side surface is convex near the optical axis.

[0044] The sixth lens 6 is a lens with positive refractive power, and its object side surface near the optical axis is convex. At least one of the object side surface and the image side surface of the sixth lens 6 is an anti-curved surface.

[0045] The seventh lens is a lens with negative refractive power, whose object side surface is concave near the optical axis, whose image side surface is concave near the optical axis, and whose image side surface has at least one curve inflection point in the area away from the optical axis. That is, the image side surface of the seventh lens 7 adopts an anti-curved surface design.

[0046] The aperture 8 is located on one side of the image side surface of the second lens 2 .

[0047] In the present invention, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6 and the seventh lens 7, among the seven lenses, at least one of the object side surfaces and the image side surfaces is aspherical. The seven lenses can be made of resin material.

[0048] The above lens assembly meets the following conditions:

[0049] (1) 1.00<TTl / f<1.65;

[0050] (2)-1≤(CT1+CT3) / (CT1-CT3)≤15.5;

[0051] (3)|f / f7|<1.589;

[0052] (4) |R11 / R12|<1.9;

[0053] (5)f / f1≤0.4;

[0054] (6)f34 / f<4.20;

[0055] (7)0.8<CT2 / (CT1+CT3)<1.7;

[0056] (8)0.4<|f / f6|+|f / f7|<3.5;

[0057] (9)-50<(CT6+ET6) / (CT6-ET6)≤5.5;

[0058] (10) 0.7≤LCT14 / LCT57≤1.3;

[0059] (11) 1.5<V1 / V3<3.0;

[0060] (12) Aperture value Fno<1.65.

[0061] In the above conditions, the relevant parameters represent the following:

[0062] f: focal length of the high-definition optical imaging lens group

[0063] TTL: The total optical length of the camera optical lens

[0064] CT1: The center thickness of the first lens on the optical axis

[0065] CT2: The center thickness of the second lens on the optical axis

[0066] CT3: The center thickness of the third lens on the optical axis

[0067] f6: focal length of the sixth lens

[0068] f7: seventh lens focal length

[0069] R11: The radius of curvature of the object side surface of the first lens

[0070] R12: The radius of curvature of the image-side surface of the first lens

[0071] f34: The combined focal length of the third and fourth lenses

[0072] ET6: Sixth lens edge thickness

[0073] CT6: Sixth lens center thickness

[0074] LCT14: The distance from the object side of the first lens to the image side of the fourth lens on the optical axis

[0075] LCT57: The distance from the object side of the fifth lens to the image side of the seventh lens on the optical axis

[0076] V1: Abbe number of the first lens

[0077] V3: Abbe number of the third lens

[0078] Fno: The aperture value of the optical lens used for imaging.

[0079] According to the conditions described above, the specific condition values ​​used in this embodiment are shown in Table 1 below:

[0080]

[0081] Combination Figure 2 As shown, this is a specification parameter table of the lens assembly in the first embodiment, wherein the focal length of the lens assembly is F=3.59 mm, the aperture number FNO=1.500, and the viewing angle HFOV=40.7°

[0082] See also Figure 3 As shown, this is the aspheric coefficient of the first embodiment of the present invention.

[0083] See Figure 4 As shown, this is the field curvature and distortion diagram of Example 1.

[0084] Example 2

[0085] See Figure 5-Figure 8 As shown, this is the second embodiment of the present invention, and its structure is the same as the first embodiment, except that the parameters of the lens are slightly adjusted. The lens assembly of the second embodiment meets the following conditions:

[0086] The specific condition values ​​used in this embodiment 2 are shown in Table 2 below:

[0087]

[0088] Combination Figure 2 As shown, this is a specification parameter table of the lens assembly in the first embodiment, wherein the focal length of the lens assembly is F=5.32mm, the aperture number FNO=1.500, and the viewing angle HFOV=33°

[0089] Example 3

[0090] See Figure 9-12 As shown, this is the third embodiment of the present invention, which is different from the above two embodiments in the specification parameter table of the lens. The lens assembly of the third embodiment meets the following conditions:

[0091] The specific condition values ​​used in this embodiment 3 are shown in Table 3 below:

[0092]

[0093] Combination Figure 2 As shown, this is a specification parameter table of the lens assembly in the first embodiment, wherein the focal length of the lens assembly is F=3.96 mm, the aperture number FNO=1.500, and the viewing angle HFOV=41.4°

[0094] Example 4

[0095] See Figure 13-Figure 16 As shown, this is the fourth embodiment of the present invention, which is different from the above three embodiments in the specification parameter table of the lens. The lens assembly of the fourth embodiment meets the following conditions:

[0096] The specific condition values ​​used in this embodiment 4 are shown in Table 4 below:

[0097]

[0098] Combination Figure 2 As shown, this is a specification parameter table of the lens assembly in the first embodiment, wherein the focal length F of the lens assembly is 4.07 mm, the aperture number FNO is 1.500, and the viewing angle HFOV is 40.71°.

[0099] In summary, the present invention patent is aimed at the current high-standard imaging quality requirements and has the characteristics of a large aperture. The imaging lens of the present invention patent is a seven-lens type, and the surface structure of each lens is combined with the optimization range of optical parameters, which can effectively shorten the overall length of the imaging lens and improve its lens viewing angle while maintaining high imaging quality. It has high resolution brought by high pixels, and is provided for use in small or thin portable devices that need to be equipped with high imaging quality equipment.

[0100] Of course, the above is only a specific embodiment of the patent of the present invention, and is not intended to limit the scope of implementation of the patent of the present invention. All equivalent changes or modifications made according to the structure, characteristics and principles described in the patent scope of the patent application of the present invention should be included in the patent scope of the patent application of the present invention.

Claims

1. An optical lens assembly, characterized in that: The lens assembly includes, in order from the object side to the image side along its optical axis: A first lens having positive refractive power, wherein the object side surface of the first lens adopts an anti-curved surface design, and both the object side surface and the image side surface of the first lens are aspherical surfaces; A second lens having positive refractive power, a convex surface on the object side near the optical axis, and a concave surface on the image side near the optical axis; an aperture stop located on one side of the image-side surface of the second lens; a third lens element with negative refractive power, whose object-side surface is convex near the optical axis and whose image-side surface is concave near the optical axis; a fourth lens element having positive refractive power, wherein the surface of the object side is convex near the optical axis, and the surface of the image side is convex near the optical axis; a fifth lens element having negative refractive power, whose object-side surface is concave near the optical axis and whose image-side surface is convex near the optical axis; a sixth lens having positive refractive power, wherein the object-side surface of the sixth lens is convex near the optical axis, the image-side surface of the sixth lens is convex near the optical axis, and both the object-side surface and the image-side surface are aspherical surfaces, and at least one of the object-side surface and the image-side surface of the sixth lens is an anti-curved surface; a seventh lens element with negative refractive power, whose object side surface is concave near the optical axis, whose image side surface is concave near the optical axis, and whose image side surface has at least one curve inflection point in a region away from the optical axis; and a filter and an imaging surface, wherein the filter is located between the seventh lens and the imaging surface; The optical lens assembly satisfies the following relationship: (1) 1.00<TTl / f<1.65; (2)-1≤(CT1+CT3) / (CT1-CT3)≤15.5; (3)|f / f7|<1.589; (4) |R11 / R12|<1.9; (5) f / f1≤0.4; (6)f34 / f<4.20; (7) 0.8<CT2 / (CT1+CT3)<1.7; (8) 0.4<|f / f6|+|f / f7|<3.5; (9) -50<(CT6+ET6) / (CT6-ET6)≤5.5; (10) 0.7≤LCT14 / LCT57≤1.3; (11) 1.5<V1 / V3<3.0; In the above conditions, the relevant parameters are as follows: f: the focal length of the lens assembly; TTL: total optical length of the lens assembly; CT1: The center thickness of the first lens on the optical axis; CT2: The center thickness of the second lens on the optical axis; CT3: The center thickness of the third lens on the optical axis; f6: focal length of the sixth lens; f7: focal length of the seventh lens; R11: radius of curvature of the object side surface of the first lens; R12: the radius of curvature of the image-side surface of the first lens; f1: the focal length of the first lens; f34: the combined focal length of the third and fourth lenses; ET6: sixth lens edge thickness; CT6: the center thickness of the sixth lens; LCT14: The distance from the object side of the first lens to the image side of the fourth lens on the optical axis; LCT57: The distance from the object side of the fifth lens to the image side of the seventh lens on the optical axis; V1: Abbe number of the first lens; V3: Abbe number of the third lens.

2. An optical lens assembly according to claim 1, characterized in that: The aperture value Fno of the lens assembly is less than 1.65.

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