CN109407265B - Optical lens - Google Patents

Abstract

An optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in order from the object side to the image side. The object side surface of the first lens has a curvature radius R1, and the image side surface has a curvature radius R2. The object side surface of the third lens has a curvature radius R5, and the image side surface has a curvature radius R6. The image side surface of the seventh lens has an inflection point, the distance value from the inflection point to the optical axis is h14, and the radius of the seventh lens is H14. The optical lens satisfies at least one of the following conditions: 0.01≦|R2/R1|, |R2/R1|≦0.6, 0≦|R5/R6|, |R5/R6|≦2, 0.3≦|h14/H14| and |h14/H14|≦0.9. According to the above embodiments, the optical lens can meet the requirements of wide viewing angle and better imaging quality.

Description

Optical lens

Technical Field

The present invention relates to an optical lens, and more particularly, to an optical lens with a wide viewing angle and a high imaging quality.

Background

In recent years, as the technologies of smart phones and handheld tablet computers are changing day by day, the requirements of various mobile devices on the optical image quality of the camera devices of the mobile devices are improved; moreover, due to the light and thin design of the mobile device, the quality of the optical lens of the camera device needs to be increased. In order to increase the competitive advantage of the market, miniaturization, high image quality and wide viewing angle are always the objectives to be pursued in product development.

Therefore, it is desirable to provide a new optical lens for improving the imaging quality while improving the viewing angle.

Disclosure of Invention

The invention relates to an optical lens. On the premise of improving the visual angle, the imaging quality is improved simultaneously.

The invention provides an optical lens. The optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The object-side surface of the first lens has a radius of curvature R1, the image-side surface of the first lens has a radius of curvature R2, the object-side surface of the third lens has a radius of curvature R5, the image-side surface of the third lens has a radius of curvature R6, the image-side surface of the seventh lens has an inflection point, the distance from the inflection point to the optical axis is H14, and the radius of the seventh lens is H14. The optical lens satisfies at least one of the following conditions: 0.01 ≦ R2/R1|, | R2/R1| ≦ 0.6, | R5/R6|, | R5/R6| ≦ 2, | H14/H14|, and | H14/H14| ≦ 0.9.

The invention further provides an optical lens. The optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. The first lens has a negative refractive power, the fourth lens has a positive refractive power, and the sixth lens has a positive refractive power. Either one of the second lens and the third lens has a positive refractive power, and the other has a negative refractive power. The object-side surface of the first lens has a radius of curvature R1, the image-side surface of the first lens has a radius of curvature R2, the object-side surface of the third lens has a radius of curvature R5, the image-side surface of the third lens has a radius of curvature R6, the image-side surface of the seventh lens has an inflection point, the distance from the inflection point to the optical axis is H14, and the radius of the seventh lens is H14. The optical lens satisfies at least one of the following conditions: 0.01 ≦ R2/R1|, | R2/R1| ≦ 0.6, | R5/R6|, | R5/R6| ≦ 2, | H14/H14|, and | H14/H14| ≦ 0.9.

The invention further provides an optical lens. The optical lens sequentially comprises a first lens group and a second lens group with negative diopter from an object side to an image side. The first lens group at least comprises a first lens, a second lens and a third lens, wherein any two lenses have negative diopter, and the other lens has positive diopter. The second lens group at least comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens. The fourth lens and the sixth lens have positive diopter, and the fifth lens and the seventh lens have either positive diopter or negative diopter. The object-side surface of the first lens has a radius of curvature R1, the image-side surface of the first lens has a radius of curvature R2, the object-side surface of the third lens has a radius of curvature R5, the image-side surface of the third lens has a radius of curvature R6, the image-side surface of the seventh lens has an inflection point, the distance from the inflection point to the optical axis is H14, and the radius of the seventh lens is H14. The optical lens satisfies at least one of the following conditions: 0.01 ≦ R2/R1|, | R2/R1| ≦ 0.6, | R5/R6|, | R5/R6| ≦ 2, | H14/H14|, and | H14/H14| ≦ 0.9.

In one or more embodiments, the third lens has positive refractive power, 0 ≦ R5/R6| ≦ R5/R6| ≦ 0.09.

In one or more embodiments, a focal length of the optical lens system is F, a distance between an image-side surface of the third lens element and an object-side surface of the fourth lens element is D, and 0< | D/F | and/or | D/F | ≦ 1.25.

In one or more embodiments, the optical lens further comprises a focal length F, an angle of view FOV, an image height Y, and an aperture FNO, and the optical lens satisfies at least one of the following conditions: 0.1 ≦ F/TTL, F/TTL ≦ 0.6, 75 ° ≦ FOV, FOV ≦ 105 °, 0.8 ≦ F/Y, F/Y ≦ 1.3, 0< (FNO × TTL)/(FOV × Y), and/or (FNO × TTL)/(FOV × Y) ≦ 0.3, where TTL is the distance from the object-side surface of the first lens to the image plane.

In one or more embodiments, the first lens has a refractive index N1 and an abbe number V1, the second lens has a refractive index N2 and an abbe number V2, the fourth lens has a refractive index N4 and an abbe number V4, the fifth lens has a refractive index N5 and an abbe number V5, the sixth lens has a refractive index N6 and an abbe number V6, the seventh lens has a refractive index N7 and an abbe number V7, and the optical lens satisfies at least one of the following conditions: 0.01 ≦ N1-N2 ≦ N1-N2 ≦ 0.35, 0.01 ≦ N3-N2 ≦ N3-N2 ≦ 0.5, 0< N5-N4, N5-N4 ≦ 0.4, 0< N5-N6, N5-N6 ≦ 0.4, 0< N5-N7, N5-N7 ≦ 0.4, 0 ≦ V7-V7 ≦ V7-V7 ≦ 30, 3 ≦ V7-V7 ≦ V3635, 5 ≦ V7-V7, V-7-V-7 ≦ V7-V-7, and 7-7 ≦ V-7.

In one or more embodiments, the third lens has a positive refractive power, and the outer diameter of the seventh lens is greater than the outer diameter of the first lens, the outer diameter of the second lens, the outer diameter of the third lens, the outer diameter of the fourth lens, the outer diameter of the fifth lens, and the outer diameter of the sixth lens.

In one or more embodiments, the first lens and the third lens are glass lenses; the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses.

In one or more embodiments, the first lens is a convex-concave lens; the second lens is a convex-concave lens or a concave-convex lens; the third lens is a biconvex lens, a convex-flat lens or a convex-concave lens; the fourth lens is a biconvex lens; the fifth lens is a biconcave lens or a meniscus lens; the sixth lens is a meniscus lens or a micro-concave-convex lens; the seventh lens is a biconcave lens or a convex-concave lens.

According to the embodiments, the optical lens can meet the requirements of wide viewing angle and better imaging quality.

Drawings

FIG. 1 shows an optical lens according to an embodiment of the present invention;

FIG. 2 shows an optical lens according to another embodiment of the present invention;

fig. 3 shows an optical lens according to still another embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, for the sake of simplicity, some conventional structures and elements are shown in the drawings in a simple schematic manner.

Fig. 1 shows an optical lens OL1 according to an embodiment of the present invention, fig. 2 shows an optical lens OL2 according to another embodiment of the present invention, and fig. 3 shows an optical lens OL3 according to still another embodiment of the present invention. To show the features of the present embodiment, only the structures related to the present embodiment are shown, and the rest of the structures are omitted.

The optical lenses OL1, OL2, OL3 may be fixed focus lenses or zoom lenses, which can be applied to an electronic device with image projection or image capturing functions, including but not limited to handheld devices, communication devices, blank shooting devices, motion cameras, vehicle cameras, monitoring devices, digital cameras, or projectors.

In one embodiment, the optical lenses OL1, OL2, and OL3 may include a first lens group G1 and a second lens group G2 in order from an object side (object-side) to an image-side (image-forming side). The first lens group G1 may have a negative refractive power and includes a plurality of lenses; the second lens group G2 can have a refractive power, such as a positive refractive power or a negative refractive power, and includes a plurality of lenses.

The first lens group G1 may include at least three lenses; the second lens group G2 may include at least four lenses. In one embodiment, the first lens group G1 includes three lenses, any two of which have negative refractive power and the other lens have positive refractive power; in another embodiment, the second lens group G2 includes four lenses, any three of which have positive refractive power, and another of which may have negative refractive power.

Referring to fig. 1, 2 and 3, the first lens group G1 includes, in order from an object side to an image side, a first lens element L1, a second lens element L2 and a third lens element L3; the second lens group G2 includes, in order from the object side to the image side, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6 and a seventh lens element L7.

The first lens L1 may have a negative refractive power; the fourth lens L4 and the sixth lens L6 may have positive refractive power; the second lens L2, the third lens L3, the fifth lens L5, and the seventh lens L7 may have either positive refractive power or negative refractive power, respectively, and each lens may be arranged along the optical axis OA.

In one embodiment, the second lens L2 has an opposite optical power as the third lens L3. For example, if one of the second lens element L2 and the third lens element L3 has positive refractive power, the other has negative refractive power. In another embodiment, the fifth lens L5 and the seventh lens L7 have either positive refractive power or negative refractive power, respectively; in addition, in still another embodiment, the fifth lens L5 has an opposite refractive power to the seventh lens L7. That is, if one of the fifth lens L5 and the seventh lens L7 has positive refractive power, the other has negative refractive power.

As shown in fig. 1, 2, and 3, the third lens L3 may be the lens closest to the image side in the first lens group G1, but is not limited to the present invention. In another embodiment, one or more lens (not shown) with diopter may be further included between the third lens L3 and the fourth lens L4, or the object side of the first lens L1 may further include one or more lens (not shown) with diopter, or one or more lens (not shown) with diopter may be further included between the first lens L1 and the second lens L2, or one or more lens (not shown) with diopter may be further included between the second lens L2 and the third lens L3; in another embodiment, the seventh lens element L7 is the lens element closest to the image side in the second lens group G2, but the invention is not limited thereto. In another embodiment, one or more lens (not shown) with refractive power may be further included between the seventh lens element L7 and the image plane I, and on the other hand, one or more lens (not shown) with refractive power may be further included between any two of the fourth lens element L4 through the seventh lens element L7.

In this embodiment, the object-side surface S1 and the image-side surface S2 of the first lens element L1 have a radius of curvature R1 and a radius of curvature R2, respectively. The first lens L1 may satisfy: at least one of the conditions of | R2/R1|, 0.1 ≦ R2/R1|, 0.2 ≦ R2/R1|, | R2/R1| ≦ 0.42, | R2/R1| ≦ 0.45, | R2/R1| ≦ 0.5, and | R2/R1| ≦ 0.6.

In this embodiment, the object-side surface S5 and the image-side surface S6 of the third lens element L3 have a radius of curvature R5 and a radius of curvature R6, respectively. The third lens L3 may satisfy: at least one of the conditions of | R5/R6| being substantially close to zero, 0 ≦ R5/R6|, 0.01 ≦ R5/R6|, | R5/R6| ≦ 1.53, | R5/R6| ≦ 1.55, | R5/R6| ≦ 1.6, | R5/R6| ≦ 1.7, | R5/R6| ≦ 1.75, | R5/R6| ≦ 1.8, | R5/R6| ≦ 1.9, and | R5/R6| ≦ 2.

Further, on the premise that the third lens L3 has positive refractive power, the radius of curvature R6 can approach infinity (R6 → ∞). In other words, R6 is much larger than R5(R6> > R5); the image-side surface S6 of the third lens L3 approaches a plane; and/or | R5/R6| approaches zero (| R5/R6| → 0). That is, the third lens L3 can satisfy the condition of 0 ≦ R5/R6| and/or 0.01 ≦ R5/R6 |.

In one embodiment, the optical lenses OL1, OL2, OL3 have a focal length F, and the optical lenses OL1, OL2, OL3 can satisfy: at least one of the conditions of 0.1 ≦ F/TTL, 0.15 ≦ F/TTL, 0.16 ≦ F/TTL, F/TTL ≦ 0.43, F/TTL ≦ 0.45, F/TTL ≦ 0.5, and F/TTL ≦ 0.6. Wherein, TTL may be a distance between an object side surface of the lens closest to the object side of the optical lenses OL1, OL2, OL3 and the imaging plane I; or, the distance from the object-side surface S1 of the first lens L1 to the image plane I; alternatively, the length from the object side surface of the first lens group G1 to the image plane I is shown.

In an embodiment, the image height of the optical lenses OL1, OL2, OL3 is Y, and the optical lenses OL1, OL2, OL3 can satisfy: at least one of the conditions of 0.8. ltoreq. F/Y, 0.85. ltoreq. F/Y, 0.9. ltoreq. F/Y, 0.95. ltoreq. F/Y, 1. ltoreq. F/Y, 1.04. ltoreq. F/Y, F/Y. ltoreq.1.07, F/Y. ltoreq.1.1, F/Y. ltoreq.1.15, F/Y. ltoreq.1.2, F/Y. ltoreq.1.25, and F/Y. ltoreq.1.3.

The optical lenses OL1, OL2, OL3 further have a viewing angle fov (field of view), and the optical lenses OL1, OL2, OL3 can satisfy: at least one of conditions such as 75 ° -FOV, 80 ° -FOV, 85 ° -FOV, 90 ° -FOV, FOV 95 °, FOV 100 °, and FOV 105 °.

In an embodiment, the apertures of the optical lenses OL1, OL2, OL3 are FNO, and the optical lenses OL1, OL2, OL3 can satisfy: at least one of the conditions of 0< (FNO × TTL)/(FOV × Y), 0.05 ≦ FNO × TTL)/(FOV × Y), 0.07 ≦ (FNO × TTL)/(FOV × Y), (FNO × TTL)/(FOV × Y) ≦ 0.2, (FNO × TTL)/(FOV × Y) ≦ 0.25, and (FNO × TTL)/(FOV × Y) ≦ 0.3.

In one embodiment, a distance between the image side of the first lens group G1 and the object side surface of the second lens group G2 is D, and the optical lenses OL1, OL2 and OL3 satisfy: 0< D/F |, 0.1 ≦ D/F |, 0.15 ≦ D/F |, 0.17 ≦ D/F |, | D/F | ≦ 1.04, | D/F | ≦ 1.05, | D/F | ≦ 1.1, | D/F | ≦ 1.15, | D/F | ≦ 1.2, and | D/F | ≦ 1.25. Specifically, D may be a distance between the center of the image-side surface S6 of the third lens L3 and the center of the object-side surface S7 of the fourth lens L4; alternatively, the length from the image-side surface S6 to the object-side surface S7 on the optical axis OA is.

In one embodiment, the seventh lens element L7 is an aspheric lens element, and the image-side surface S14 is an aspheric surface including at least one inflection point IF. The distance from the inflection point IF to the optical axis OA is H14, and the radius of the seventh lens L7 is H14. The optical lenses OL1, OL2, OL3 may satisfy: at least one of | H14/H14|, 0.35 ≦ H14/H14|, 0.4 ≦ | H14/H14|, 0.45 ≦ | H14/H14|, 0.5 ≦ | H14/H14|, 0.55 ≦ H14/H14|, 0.65 ≦ | H14/H14|, 0.67 ≦ | H14/H14|, | H14/H14| ≦ 0.73, | H14/H14| ≦ 0.75, | H14/H14| ≦ 0.85 and | H14/H14| ≦ 0.9. Specifically, h14 may be the shortest distance or perpendicular distance from the inflection point IF of the seventh lens L7 to the optical axis OA. Further, the inflection point IF may be located between the adjacent optical axis OA on the image-side surface S14 of the seventh lens L7 and the outer edge of the lens; h14 may be half of the physical diameter or half of the optical effective diameter of the seventh lens L7, or the distance, e.g., the shortest distance or the perpendicular distance, from the optical effective outer diameter ψ 7 of the seventh lens L7 to the optical axis OA.

Further, on the premise that the third lens L3 has positive refractive power, the seventh lens L7 may be the lens having the largest outer diameter ψ 7 among the first to seventh lenses L1 to L7.

The refractive index of the first lens L1 is N1, and the Abbe number is V1; the refractive index of the second lens L2 is N2, and the Abbe number is V2; the refractive index of the fourth lens is N4, and the Abbe number is V4; the refractive index of the fifth lens L5 is N5, and the Abbe number is V5; the refractive index of the sixth lens L6 is N6, and the Abbe number is V6; the seventh lens L7 has a refractive index N7 and an abbe number V7.

In one embodiment, the optical lenses OL1, OL2, OL3 may satisfy: 0.01 ≦ N-N ≦ 0.05 ≦ N-N ≦ 0.1 ≦ N-N ≦ 0.35, | N-N ≦ 0.01 ≦ 0.05 ≦ N ≦ 0.25, | N-N ≦ 0.3, | N-N ≦ 0.35, 0.01 ≦ N-N ≦ 0.05 ≦ N-N |, 0.1 ≦ N-N ≦ 0.15 ≦ N-N ≦ 0.2 ≦ N-N ≦ 0.25 ≦ N-N ≦ 0.3, | -N ≦ 0.35, | N-N ≦ 0.4, | -N ≦ 0.45, | -N ≦ 0.5 ≦ N-N ≦ 0.3, | -N ≦ 0.05 ≦ 0.0 ≦ N ≦ 0.05 ≦ 0, 0.0.05 ≦ N ≦ 0.0.0.0.15 ≦ N-N ≦ 0.35, |, N-N ≦ 0.4, 0.4 ≦ 0.4, N-0.45, 0., 0N-N, 0.01 ≦ N, 0.05 ≦ N, 0.1 ≦ N-N, N-N ≦ 0.15, N-N ≦ 0.2, N-N ≦ 0.25, N-N ≦ 0.3, N-N ≦ 0.35, N-N ≦ 0.4, 0< N-N, 0.01 ≦ N, 0.05 ≦ N, 0.1 ≦ N-N, N-N ≦ 0.15, N-N ≦ 0.2, N-N ≦ 0.25, N-N ≦ 0.3, N-N ≦ 0.35, N-N ≦ 0.4, 0 ≦ V-V ≦ 3, V-V ≦ 5 ≦ V-V ≦ 10 ≦ V-V ≦ V-V ≦ 10 ≦ V-V ≦ 10 ≦ V-V ≦ V-V ≦ 3 ≦ V-V ≦ 30 ≦ V ≦, 15V-V ≦ 15 ≦ V-V ≦ 18, | V-V ≦ 20, | V-V ≦ 25, | V-V ≦ 30, | V-V ≦ 35, ≦ 5 ≦ V-V, 10 ≦ V-V, 15 ≦ V-V, 20 ≦ V-V, 25 ≦ V-V, 30 ≦ V-V, 31 ≦ V-V, V-V ≦ 58, V-V ≦ 60, V-V ≦ 65, V-V ≦ 70, 5 ≦ V-V, 10 ≦ V-V, 15 ≦ V-V, 20 ≦ V-V, 25 ≦ V-V, 30 ≦ V-V, 31 ≦ V-V, 32, V-V ≦ 35, V-V ≦ 40, V-V ≦ 40, 50 ≦ V-V ≦ V-V, V-20 ≦ V-exemplary, V-V, At least one of the conditions of 5 ≦ V7-V5, 10 ≦ V7-V5, 15 ≦ V7-V5, 20 ≦ V7-V5, 25 ≦ V7-V5, 30 ≦ V7-V5, 31 ≦ V7-V5, V7-V5 ≦ 32, V7-V5 ≦ 35, V7-V5 ≦ 40, V7-V5 ≦ 45, V7-V5 ≦ 50, V7-V5 ≦ 55, and V7-V5 ≦ 60.

In addition, in one embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 may all be made of glass lenses; in another embodiment, at least one of the lenses may be a plastic lens; in another embodiment, the first lens L1 and the third lens L3 may be glass lenses, and the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 may be plastic lenses. The glass lens may be made of a glass material and the plastic lens may be made of a plastic material. The plastic material may include, but is not limited to, polycarbonate (polycarbonate), cyclic olefin copolymer (e.g., APEL), polyester resin (e.g., OKP4 or OKP4HT), and the like, or may be a mixture and/or compound material including at least one of the foregoing.

The first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 may be a spherical lens element, a free-form lens element or an aspheric lens element, respectively. In one embodiment, the first lens element L1 can be a spherical lens element, the second lens element L2 and the third lens element L3 can be any one of a spherical lens element, an aspheric lens element and a free-form lens element, and the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 can be any one of an aspheric lens element and a free-form lens element.

Specifically, each free-form surface lens has at least one free-form surface, i.e., the object-side surface and/or the image-side surface of the free-form surface lens is a free-form surface; each aspheric lens has at least one aspheric surface, i.e., the object-side surface and/or the image-side surface of the aspheric lens are aspheric surfaces. And each aspheric surface can satisfy the following mathematical formula:

wherein Z is a coordinate value in the optical axis OA direction, and the optical transmission direction is a positive direction: ai is an aspheric coefficient, i is 2, 4, 6, 8, 10, 12, 14 or 16; k is a conic constant; c is 1/R, and R is a curvature radius; y is a coordinate value orthogonal to the optical axis OA, and the direction away from the optical axis OA is a positive direction. In addition, the values of the parameters or coefficients of each aspheric surface equation may be independent of each other.

As shown in fig. 1 to fig. 3, the object-side surface S1 and the image-side surface S2 of the first lens element L1 of the optical lenses OL1, OL2 and OL3 all have positive refractive power on the optical axis OA. The object-side surface S1 may be a convex surface protruding toward the object side; the image-side surface S2 may be a concave surface that is concave toward the object side. Further, the first lens L1 may be a convex-concave glass or plastic lens.

The object-side surface S3 and the image-side surface S4 of the second lens element L2 have a positive refractive index or a negative refractive index along the optical axis OA. The object-side surface S3 may be a convex surface convex toward the object side or a concave surface concave toward the image side; the image side surface S4 may be a concave surface concave toward the object side or a convex surface convex toward the image side. Further, the second lens L2 may be a convex-concave glass or plastic lens, or a convex-concave glass or plastic lens.

The object-side surface S5 of the third lens element L3 can have a positive refractive index on the optical axis OA, and the image-side surface S6 can have a negative refractive index, a positive refractive index or an infinite refractive index on the optical axis OA. The object-side surface S5 may be a convex surface protruding toward the object side; the image-side surface S6 may be convex toward the image side, concave toward the object side, or nearly planar or substantially planar. Further, the third lens L3 may be a glass or plastic lens that is biconvex, convex flat, or convex-concave.

The object-side surface S7 of the fourth lens element L4 has a positive refractive index along the optical axis OA, and the image-side surface S8 has a negative refractive index along the optical axis OA. The object-side surface S7 may be a convex surface protruding toward the object side; the image-side surface S8 may be a convex surface convex toward the image side. Further, the fourth lens L4 may be a double convex glass or plastic lens.

The object-side surface S9 of the fifth lens element L5 can have a negative refractive index at the optical axis OA, and the image-side surface S10 can have a positive refractive index or a negative refractive index at the optical axis OA. The object-side surface S9 may be a concave surface that is concave toward the image side; the image side surface S10 may be a concave surface concave toward the object side, or a convex surface convex toward the image side. Further, the fifth lens L5 may be a biconcave or concave-convex glass or plastic lens.

The object-side surface S11 and the image-side surface S12 of the sixth lens element L6 have positive refractive index along the optical axis OA. The object-side surface S11 may be a concave surface that is concave or slightly concave toward the image side; the image-side surface S12 may be a convex surface convex toward the image side. Further, the sixth lens L6 may be a concave-convex or micro-concave-convex glass lens or a plastic lens.

The object-side surface S13 and the image-side surface S14 of the seventh lens element L7 have positive refractive power along the optical axis OA. The object-side surface S13 may be a convex surface protruding toward the object side in the central region, and a line shape from the center to the edge may be a concave surface extending toward the image side and then turning toward the object side; a central region of the image-side surface S14 may be concave toward the object side. Further, the seventh lens L7 may be a biconcave glass or plastic lens, or a convex-concave glass or plastic lens. The object-side surface S13 and the image-side surface S14 may be both aspheric surfaces or free-form surfaces, or at least spherical surfaces.

Furthermore, the optical lenses OL1, OL2, OL3 may further include a stop St and/or a protective sheet C; an image capturing unit (not shown) may be disposed on the image plane I for performing photoelectric conversion on the light beams passing through the optical lenses OL1, OL2, and OL 3. The stop St may be disposed between any two lenses L1 to L7 of the optical lenses OL1, OL2, and OL3, on the object side of the first lens L1, or between the seventh lens L7 and the image plane I, for example, between the third lens L3 and the fourth lens L4, but not limited thereto; the protect sheet C may also be disposed between the seventh lens L7 and the image forming surface I.

On the other hand, the protection sheet C can simultaneously have the functions of protecting the image capturing unit and filtering the infrared beam; alternatively, as shown in the optical lens OL3, it may further include a filter F, and the filter F may be disposed between the seventh lens L7 and the protective sheet C.

Table 1A lists lens parameters of the optical lens OL1 of fig. 1 of the present invention, including the radius of curvature, thickness, refractive index, abbe number (abbe number), radius, and the like of each lens. The surface numbers of the lenses are arranged in order from the object side to the image side, for example: "St" represents the stop St, "S1" represents the object-side surface S1 of the first lens L1, "S2" represents the image-side surface S2 …, "S15" and "S16" of the first lens L1 respectively represent the object-side surface S15 and the image-side surface S16 of the protective sheet C, and so on. In addition, the "thickness" represents a distance between the surface and an adjacent image-side surface, for example, the "thickness" of the object-side surface S1 is a distance between the object-side surface S1 of the first lens L1 and the image-side surface S2 of the first lens L1; the "thickness" of the image-side surface S2 is the distance between the image-side surface S2 of the first lens L1 and the object-side surface S3 of the second lens L2.

TABLE 1A

Table 1B lists the aspheric coefficients of the optical lens OL1 of fig. 1 of the present invention. When the object-side surfaces S3, S7, S9, S11, and S13 and the image-side surfaces S4, S8, S10, S12, and S14 are aspheric surfaces, coefficients of the aspheric equations are shown in table 1B.

TABLE 1B

	A2	A4	A6	A8	A10	A12	A14	A16
									S3	0.000	0.028	-0.010	0.000	0.001	0.000	0.000	0.000
S4	0.000	0.038	0.000	-0.014	0.002	0.006	-0.004	0.001
									S7	0.000	-0.029	-0.094	-0.053	-0.454	2.432	-8.083	8.977
S8	0.000	-0.046	-0.043	-0.004	0.062	-0.451	0.193	0.502
									S9	0.000	-0.058	0.059	0.084	-0.004	-0.778	1.844	-1.073
S10	0.000	-0.033	-0.020	0.130	-0.166	0.163	-0.048	-0.012
									S11	0.000	0.016	-0.048	0.066	0.020	-0.030	0.017	-0.008
S12	0.000	-0.118	0.210	0.171	0.086	-0.001	-0.014	0.004
									S13	0.000	-0.164	0.053	-0.008	-0.003	0.001	0.001	0.000
S14	0.000	-0.058	0.020	-0.005	0.001	0.000	0.000	0.000

Table 2A lists the lens parameters of the optical lens OL2 of fig. 2 of the present invention, which are defined and intended to be substantially the same as table 1A.

TABLE 2A

Further, referring to table 1A and table 2A together, the third lens L3 can also satisfy: at least one of the conditions of | R5/R6| ≦ 0.043, | R5/R6| ≦ 0.05, | R5/R6| ≦ 0.06, | R5/R6| ≦ 0.07, | R5/R6| ≦ 0.08, and | R5/R6| ≦ 0.09.

Table 2B lists the aspheric coefficients of the optical lens OL2 of fig. 1 of the present invention. When the object-side surfaces S3, S7, S9, S11, and S13 and the image-side surfaces S4, S8, S10, S12, and S14 are aspheric surfaces, coefficients of the aspheric equations are as shown in table 2B.

TABLE 2B

	A2	A4	A6	A8	A10	A12	A14	A16
									S3	0.000	0.032	-0.009	0.000	0.001	0.000	0.000	0.000
S4	0.000	0.043	-0.001	-0.013	0.003	0.005	-0.004	0.001
									S7	0.000	-0.020	-0.056	-0.068	-0.393	2.616	-6.999	6.082
S8	0.000	-0.032	-0.050	-0.068	0.090	-0.232	-0.045	0.405
									S9	0.000	-0.084	0.025	0.077	-0.033	-0.816	1.875	-0.966
S10	0.000	-0.048	-0.023	0.122	-0.177	0.151	-0.040	-0.006
									S11	0.000	0.019	-0.050	0.061	0.019	-0.033	0.013	-0.003
S12	0.000	-0.119	0.211	-0.169	0.085	-0.001	-0.014	0.004
									S13	0.000	-0.166	0.049	-0.007	-0.003	0.001	0.001	0.000
S14	0.000	-0.067	0.021	-0.006	0.001	0.000	0.000	0.000

Table 3A lists the lens parameters of the optical lens OL3 of fig. 3 according to the present invention, which are defined and intended to be substantially the same as table 1A.

TABLE 3A

Further, referring to table 2A and table 3A together, the third lens L3 further satisfies: at least one of the conditions of 0.02 ≦ R5/R6|, 0.03 ≦ R5/R6|, 0.035 ≦ R5/R6|, 0.04 ≦ R5/R6| and 0.043 ≦ R5/R6 |.

Table 3B lists the aspheric coefficients of the optical lens OL3 of fig. 3 of the present invention. When the object-side surfaces S5, S7, S9, S11, and S13 and the image-side surfaces S6, S8, S12, and S14 are aspheric surfaces, coefficients of the aspheric equations are shown in table 3B.

TABLE 3B

A2

A4

A6

A8

A10

A12

A14

A16

S5

0

3.0E-03

-2.5E-04

-5.5E-05

5.1E-06

-9.3E-08

0

0

S6

0

8.6E-03

-1.8E-04

-3.1E-04

4.4E-05

-2.2E-06

3.8E-08

0

S7

0

-4.2E-03

-9.6E-04

-3.8E-04

3.9E-05

-4.6E-05

0

0

S8

0

-5.6E-03

-1.5E-03

-3.1E-04

6.1E-05

-1.6E-05

0

0

S9

0

7.5E-03

-1.7E-03

2.4E-04

3.9E-05

-4.1E-06

5.7E-06

0

S11

0

9.1E-03

-6.4E-04

-7.2E-06

1.5E-05

-5.4E-07

2.8E-07

0

S12

0

7.2E-03

8.4E-04

4.7E-05

-1.8E-05

-3.8E-07

1.2E-07

0

S13

0

-1.5E-02

5.2E-04

-1.5E-05

2.1E-06

-3.8E-07

1.1E-08

O

S14

0

-1.6E-02

4.5E-04

9.8E-06

-8.6E-07

-4.5E-08

3.9E-10

0

Table 4 lists the optical data of the optical lenses OL1, OL2, OL3 in fig. 1, 2, 3.

TABLE 4

	Optical lens OL1	Optical lens OL2	Optical lens OL3
				F(mm)	3	3	4.04
TTL(mm)	7	8.1	25
				FNO(mm)	2.6	2.6	2.8
Y(mm)	2.8	2.8	3.9
				D(mm)	0.5	0.55	4.2
FOV (degree)	90	90	90
				R2(mm)	4	4.2	5.34
R1(mm)	9.5	14.7	26.16
				H14(mm)	2.45	2.25	3.55
h14(mm)	1.65	1.65	2.58
				F/TTL	0.43	0.37	0.16
F/Y	1.07	1.07	1.04
				(FNO*TTL)/(FOV*Y)	0.07	0.08	0.20
R2/R1	0.42	0.29	0.20
				D/F	0.17	0.18	1.04
R5/R6	0.043	0	1.53
				h14/H14	0.67	0.73	0.73

As can be seen from the above embodiments, the optical lenses OL1, OL2, and OL3 not only have a wider viewing angle, but also have a better distortion effect, so the optical lenses OL1, OL2, and OL3 have the characteristics of a wider viewing angle and high imaging quality.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims (10)

1. An optical lens assembly, in order from an object side to an image side comprising: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the first lens element has an object-side surface with a radius of curvature R1 and an image-side surface with a radius of curvature R2, the third lens element has an object-side surface with a radius of curvature R5 and an image-side surface with a radius of curvature R6, the seventh lens element has an inflection point, a distance from the inflection point to an optical axis is H14, and a radius of the seventh lens element is H14, and the optical lens element satisfies at least one of the following conditions: 0.01 ≦ R2/R1 ≦ 0.6, | R5/R6| ≦ 2, 0.3 ≦ H14/H14| ≦ 0.9.

2. An optical lens assembly, in order from an object side to an image side comprising: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein the first lens element has negative refractive power, the fourth lens element has positive refractive power, the sixth lens element has positive refractive power, either the second lens element or the third lens element has positive refractive power, and the other lens element has negative refractive power, the first lens element has a curvature radius R1 on the object side surface and a curvature radius R2 on the image side surface, the third lens element has a curvature radius R5 on the object side surface and a curvature radius R6 on the image side surface, the seventh lens element has an inflection point on the image side surface, the distance between the inflection point and an optical axis is H14, and the radius of the seventh lens element is H14, and the optical lens element satisfies at least one of the following conditions: 0.01 ≦ R2/R1 ≦ 0.6, | R5/R6| ≦ 2, 0.3 ≦ H14/H14| ≦ 0.9.

3. An optical lens assembly, in order from an object side to an image side comprising:

a first lens group with negative diopter, which at least comprises a first lens, a second lens and a third lens, wherein any two lenses have negative diopter, and the other lens has positive diopter;

a second lens group including at least a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, the fourth lens element and the sixth lens element having positive refractive power, the fifth lens element and the seventh lens element having positive refractive power and negative refractive power, the first lens element having an object-side surface with a radius of curvature R1 and an image-side surface with a radius of curvature R2, the third lens element having an object-side surface with a radius of curvature R5 and an image-side surface with a radius of curvature R6, the seventh lens element having an inflection point on the image-side surface, the inflection point being separated from an optical axis by a distance H14, and the seventh lens element having a radius H14, the optical lens system satisfies at least one of the following conditions: 0.01 ≦ R2/R1 ≦ 0.6, | R5/R6| ≦ 2, 0.3 ≦ H14/H14| ≦ 0.9.

4. An optical lens according to any one of claims 1 to 3, characterized in that the third lens has positive refractive power, 0 ≦ R5/R6|, and/or | R5/R6| ≦ 0.09.

5. An optical lens according to any one of claims 1-3, wherein a focal length of the optical lens is F, and a distance between an image-side surface of the third lens element and an object-side surface of the fourth lens element is D, 0< | D/F | and/or | D/F | ≦ 1.25.

6. An optical lens according to any one of claims 1-3, further comprising a focal length F, a field of view FOV, an image height Y and an aperture FNO, and the optical lens satisfies at least one of the following conditions: 0.1 ≦ F/TTL, F/TTL ≦ 0.6, 75 ° ≦ FOV, FOV ≦ 105 °, 0.8 ≦ F/Y, F/Y ≦ 1.3, 0< (FNO × TTL)/(FOV × Y), and/or (FNO × TTL)/(FOV × Y) ≦ 0.3, where TTL is the distance from the object-side surface of the first lens to an imaging plane.

7. An optical lens according to any one of claims 1 to 3, characterized in that the first lens has a refractive index N1 and an Abbe number V1, the second lens has a refractive index N2 and an Abbe number V2, the fourth lens has a refractive index N4 and an Abbe number V4, the fifth lens has a refractive index N5 and an Abbe number V5, the sixth lens has a refractive index N6 and an Abbe number V6, the seventh lens has a refractive index N7 and an Abbe number V7, and the optical lens satisfies at least one of the following conditions: 0.01 ≦ N1-N2 ≦ N1-N2 ≦ 0.35, 0.01 ≦ N3-N2 ≦ N3-N2 ≦ 0.5, 0< N5-N4, N5-N4 ≦ 0.4, 0< N5-N6, N5-N6 ≦ 0.4, 0< N5-N7, N5-N7 ≦ 0.4, 0 ≦ V7-V7 ≦ V7-V7 ≦ 30, 3 ≦ V7-V7 ≦ V3635, 5 ≦ V7-V7, V-7-V-7 ≦ V7-V-7, and 7-7 ≦ V-7.

8. An optical lens system according to any one of claims 1 to 3, wherein the third lens element has positive refractive power, and an outer diameter of the seventh lens element is larger than an outer diameter of the first lens element, an outer diameter of the second lens element, an outer diameter of the third lens element, an outer diameter of the fourth lens element, an outer diameter of the fifth lens element and an outer diameter of the sixth lens element.

9. An optical lens according to any one of claims 1 to 3, characterized in that the first lens and the third lens are glass lenses; the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses.

10. An optical lens according to any one of claims 1 to 3, characterized in that the first lens is a convex-concave lens; the second lens is a convex-concave lens or a concave-convex lens; the third lens is a biconvex lens, a convex-flat lens or a convex-concave lens; the fourth lens is a biconvex lens; the fifth lens is a biconcave lens or a meniscus lens; the sixth lens is a meniscus lens or a micro-concave-convex lens; the seventh lens is a biconcave lens or a convex-concave lens.

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