CN107305276B

CN107305276B - Optical lens

Info

Publication number: CN107305276B
Application number: CN201710069503.8A
Authority: CN
Inventors: 陈嘉鸿
Original assignee: Ability Enterprise Co Ltd
Current assignee: Ability Enterprise Co Ltd
Priority date: 2016-04-21
Filing date: 2017-02-08
Publication date: 2020-11-10
Anticipated expiration: 2037-02-08
Also published as: CN107305276A

Abstract

The invention discloses an optical lens. The optical lens comprises a first lens group with diopter and a second lens group with positive diopter. The first lens group at least comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with negative diopter and a fourth lens with positive diopter in sequence from the object side to the image side. The second lens group comprises a plurality of lenses, wherein the lens closest to the image side is a biconvex lens.

Description

Optical lens

Technical Field

The present invention relates to an optical lens, and more particularly, to a light, thin, wide-angle and high-quality optical lens.

Background

In recent years, due to the rise of outdoor sports image capturing devices, demands for blank cameras and wide-angle lenses have been increased, and the thickness of optical lenses has become thinner, so that the design of such lenses is both light and thin, wide-angle, and high image quality.

Therefore, in order to satisfy the current requirement for high image performance of the wide-angle lens, it is necessary to provide a new optical lens that can simultaneously achieve the purpose of improving the imaging quality and the wide angle of the optical lens.

Disclosure of Invention

The present invention provides an optical lens, which can achieve the lightness, thinness, wide viewing angle and improvement of imaging quality.

In order to achieve the above object, the present invention provides an optical lens. The optical lens comprises a first lens group with diopter and a second lens group with positive diopter. The first lens group at least comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with negative diopter and a fourth lens with positive diopter in sequence from the object side to the image side. The second lens group comprises a plurality of lenses, wherein the lens closest to the image side has positive diopter.

According to another embodiment of the present invention, an optical lens is provided. The optical lens comprises a first lens group with diopter and a second lens group with positive diopter. The first lens group at least comprises a first lens with positive diopter, a second lens with negative diopter, a third lens with negative diopter and a fourth lens with positive diopter in sequence from the object side to the image side. The second lens group comprises a plurality of lenses, wherein the lens closest to the image side is a biconvex lens.

According to another embodiment of the present invention, an optical lens is provided. The optical lens comprises a first lens with diopter, a second lens with negative diopter, a third lens with negative diopter, a fourth lens with positive diopter, a fifth lens with diopter, a sixth lens with diopter, a seventh lens with diopter, an eighth lens with diopter and a ninth lens with positive diopter from the object side to the image side. The sixth lens, the seventh lens and the eighth lens form a compound lens, or the sixth lens and the seventh lens form the compound lens, or the seventh lens and the eighth lens form the compound lens.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

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. 3A illustrates lens parameters of the optical lens of FIG. 1 according to the present invention;

FIG. 3B is a chart illustrating aspheric coefficients for the optical lens of FIG. 1 in accordance with the present invention;

FIG. 4A is a graph illustrating distortion (distortion) of the optical lens of the embodiment of FIG. 1;

FIG. 4B is a field curvature (field curvature) graph of the optical lens of the embodiment of FIG. 1;

FIG. 5 is a graph illustrating a peripheral luminance of the optical lens of the embodiment of FIG. 1;

FIG. 6A illustrates lens parameters of the optical lens of FIG. 2 according to the present invention;

FIG. 6B is a chart illustrating aspheric mathematical coefficients for the optical lens of FIG. 2 in accordance with the present invention;

FIG. 7 shows an optical lens according to another embodiment of the present invention;

FIG. 8A illustrates lens parameters of the optical lens of FIG. 7 according to the present invention;

FIG. 8B is a chart illustrating aspheric coefficients for the optical lens of FIG. 7 in accordance with the present invention;

fig. 9 is a diagram illustrating optical data of the optical lenses of fig. 3A, 3B, 6A, 6B, 8A, and 8B.

Detailed Description

The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:

the following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings. Aside from the detailed description, this invention is capable of general implementation in other embodiments and its several details are capable of modifications in various obvious respects, all without departing from the scope of the present disclosure. In the description of the specification, numerous specific details are set forth in order to provide a more thorough understanding of the invention; however, the present invention may be practiced without some or all of these specific details. In other instances, well-known steps or elements have not been described in detail so as not to unnecessarily obscure the present invention. The same or similar elements in the drawings will be denoted by the same or similar symbols. It is specifically noted that the drawings are for illustrative purposes only and do not represent actual dimensions or quantities of elements unless specifically stated otherwise.

Fig. 1 shows an optical lens OL1 according to an embodiment of the present invention, and fig. 2 shows an optical lens OL2 according to 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 may be wide-angle lenses, which can be applied to a device with image projection or image capture functions, including but not limited to handheld communication systems, aerial cameras, motion cameras, surveillance systems, digital cameras, digital video cameras, or projectors.

In one embodiment, the optical lenses OL1, OL2 may include a first lens group G1 and a second lens group G2 in order from an object side (object side) to an image-forming side (image-forming side). The first lens group G1 has a diopter, such as a positive diopter or a negative diopter, and includes a plurality of lenses; the second lens group G2 has positive refractive power and includes a compound lens and a plurality of lenses. The first lens group G1 may include four or more lenses; the compound lens may be composed of two or more lenses, but is not limited to the invention.

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

Referring to fig. 1 and 2, 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, a third lens element L3 and a fourth lens element L4; the second lens group G2 includes, in order from the object side to the image side, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, an eighth lens element L8 and a ninth lens element L9.

Specifically, the first lens L1 may have a positive refractive power; the second lens L2 may have a negative refractive power; a third lens L3 may have negative optical power; the fourth lens L4 may have a positive refractive power; the fifth lens L5 may have diopter, e.g., positive diopter or negative diopter; the sixth lens L6 may have diopter, e.g., positive diopter or negative diopter; the seventh lens L7 may have diopter such as negative diopter or positive diopter; the eighth lens L8 may have diopter such as positive diopter or negative diopter; the ninth lens L9 may have a positive refractive power.

In one embodiment, the fifth lens element L5 and the ninth lens element L9 both have positive refractive power; any one of the sixth lens element L6, the seventh lens element L7 and the eighth lens element L8 has negative refractive power, and the other two lens elements may have positive refractive power. For example, the sixth lens L6, the seventh lens L7, and the eighth lens L8 have positive, negative, and positive refractive powers, respectively, but the present invention is not limited thereto, and the sixth lens L6, the seventh lens L7, and the eighth lens L8 may have negative, positive, and positive refractive powers, or positive, and negative refractive powers, respectively.

Furthermore, as shown in FIG. 1, the sixth lens element L6, the seventh lens element L7, and the eighth lens element L8 may form a compound lens element (not shown); alternatively, as shown in fig. 2, the sixth lens L6 and the seventh lens L7 may constitute a compound lens (not labeled); in another embodiment, a compound lens may be formed by the seventh lens L7 and the eighth lens L8. Wherein the compound lens may have a negative refractive power.

In one embodiment, the fourth lens L4 has an Abbe number V4, and V4 can satisfy at least one of the conditions of V4 not less than 35, V4 not less than 40, V4 not more than 47.2, V4 not more than 55, V4 not more than 60, V4 not more than 35 not more than 47.2, V4 not more than 40 not more than 47.2, V4 not more than 35 not more than 55, V4 not more than 40 not more than 55, V4 not more than 60, V4 not more than 40 not more than 60, and the like.

As shown in fig. 1 and 2, the fourth lens L4 is the lens closest to the image side in the first lens group G1, but is not limited to the invention. In another embodiment, one or more lenses (not shown) with refractive power may be further included between the fourth lens L4 and the fifth lens L5, and V4 may be an abbe number of the fourth lens L4, an abbe number of any lens between the fourth lens L4 and the fifth lens L5, or an abbe number of a lens closest to the image side in the first lens group G1.

In one embodiment, the ninth lens L9 has an Abbe number V9, and V9 can satisfy at least one of the conditions of V9 not less than 50, V9 not less than 60, V9 not less than 65, V9 not more than 70, V9 not more than 75, V9 not more than 85, V9 not more than 50, V9 not more than 60, V9 not more than 65, V9 not more than 50, V9 not more than 60, V9 not more than 65, V9 not more than 67, V9 not more than 50, V9 not more than 60, V9 not more than 65, V9 not more than 67, V9 not more than 50, V9 not more than 60, V9 not more than 85, V3667 not more than 67 and V9 not more than 85.

As shown in fig. 1 and 2, the ninth lens L9 is the lens closest to the image side in the second lens group G2, but is not limited to the invention. In another embodiment, one or more lens (not shown) with refractive power may be further included between the ninth lens element L9 and the image plane I, and V9 may be the abbe number of the ninth lens element L9, the abbe number of any lens element between the ninth lens element L9 and the image plane I, or the abbe number of the lens element closest to the image side in the second lens group G2.

The optical lenses OL1, OL2 may further include a total focal length F and a total length TTL. In one embodiment, the optical lenses OL1 and OL2 can satisfy at least one of the conditions of F/TTL not less than 0, F/TTL not less than 0.05, F/TTL not less than 0.1, F/TTL not more than 0.2, F/TTL not more than 0.25, F/TTL not more than 0.2, F/TTL not more than 0.17, F/TTL not more than 0.05 not less than 0.25, F/TTL not more than 0.05 not less than 0.2, F/TTL not more than 0.05 not less than 0.17, F/TTL not more than 0.1 not less than 0.25, F/TTL not more than 0.1 not less than 0.2, F/TTL not more than 0.1 not less than 0.17, F/TTL not more than 0.145 not more than 0.25, F/TTL not more than. The total length TTL may be a distance from the object-side surface of the lens closest to the object side of the optical lenses OL1 and OL2 to the image plane I. Specifically, the total length TTL is a distance from the object-side surface of the first lens group G1 to an imaging plane I on an optical axis OA of the optical lenses OL1, OL 2. Alternatively, the total length TTL is the distance from the object-side surface S1 of the first lens L1 to the image plane I.

The optical lenses OL1, OL2 further include an image height Y. In one embodiment, the optical lenses OL1 and OL2 can satisfy the conditions that F/Y is not less than 0.8, F/Y is not less than 0.85, F/Y is not less than 0.9, F/Y is not less than 0.97, F/Y is not less than 1.065, F/Y is not less than 1.075, F/Y is not less than 1.15, F/Y is not less than 1.2, F/Y is not less than 0.8 and not more than 1.065, F/Y is not less than 0.8 and not more than 1.075, F/Y is not less than 0.85 and not more than 1.065, F/Y is not less than 0.85 and not more than 1.075, F/Y is not less than 0.85 and not more than 1.2, F/Y is not less than 0.9 and not more than 1.065, F/Y is not more than 0.9 and not more than 1.075, F/Y is not more than 0.9 and not more than 1.065, Y is not more than 0.97 and not more than 1.97, and not more than 1.97.

In one embodiment, the optical lenses OL1 and OL2 can further satisfy at least one of the conditions that d/F is greater than or equal to 0.15, d/F is greater than or equal to 0.2, d/F is greater than or equal to 0.25, d/F is less than or equal to 0.67, d/F is greater than or equal to 0.15 and less than or equal to 0.85, d/F is greater than or equal to 0.2 and less than or equal to 0.67, d/F is greater than or equal to 0.2 and less than or equal to 0.75, d/F is greater than or equal to 0.2 and less than or equal to 0.85, d/F is greater than or equal to 0.25 and less than or equal to 0.67, d/F is greater than or equal to 0.25 and less than or equal to 0.. Where d may be a distance between the fourth lens L4 and the second lens group G2. In other words, d is a distance between the first lens group G1 and the second lens group G2; or, d is a distance between the image-side surface of the fourth lens L4 and the object-side surface of the fifth lens L5.

The optical lenses OL1, OL2 also have a Field of View (FOV). In one embodiment, the optical lenses OL1, OL2 can satisfy at least one condition of FOV not less than 70 °, FOV not less than 90 °, FOV not more than 95 °, FOV not more than 115 °, FOV not less than 70 ° not more than 95 °, FOV not less than 70 ° not more than 115 °, FOV not less than 90 ° not more than 95 °, FOV not less than 90 ° not more than 115 °, and the like.

The optical lenses OL1 and OL2 further include a diaphragm FNO. In one embodiment, the optical lens OL1 can satisfy the conditions that (FNO XTTL)/(FOV XY) is not less than 0, (FNO XTTL)/(FOV XY) is not less than 0.1, (FNO XTTL)/(FOV XY) is not less than 0.15, (FNO XTTL)/(FOV XY) is not less than 0.16, (FNO XTTL)/(FOV XY) is not more than 0.211, (FNO XTTL)/(FOV XY) is not more than 0.3, (FNO XFOV)/(XY) is not more than 0.4, FOV (FNO XTTL)/(XY) is not more than 0.211, FOV (FNO XTTL)/(XY) is not more than 0.1 and not more than 0.3, FOV (FNO XTTL)/(Y) is not more than 0.3, FOV (FOV XTTL) is not more than 0.4, FOV (FNO XTTL) is not less than 0.1 XTTL) and not more than 0.211, FOV (FOV) is not more than 0.1 XTTL) is not more than 0.15, FOV (FNO XTTL) is not more than 0.211, FOV) is not more than 0.3, FOV is not more than 0.211, FOV (FNO XTTL, At least one of (FNO XTR)/(FOV XY) not less than 0.15, (FNO XTR)/(FOV XY) not more than 0.16, (FNO XTR)/(FOV XY) not more than 0.211, (FNO XTR)/(FOV XY) not more than 0.16, and (FNO XTR)/(FOV XY) not more than 0.4, etc. is not less than 0.16.

The object-side surface S1 of the first lens element L1 can have a first radius of curvature R1, and the image-side surface S2 of the first lens element L1 can have a second radius of curvature R2. In one embodiment, the optical lenses OL1 and OL2 satisfy at least one of the conditions of | R2/R1 | not less than 0.8, | R2/R1 ≥ 1, | R2/R1 ≥ 1.2, | R2/R1 ≤ 1.55, | R2/R1 ≤ 2, 0.8 ≤ R2/R1 ≤ 1.55, 0.8 ≤ R2/R1 ≤ 2, 1 ≤ R2/R1 ≤ 1.55, 1 ≤ R2/R1 ≤ 2, 1.2 ≤ R2/R1 ≤ 1.55, and 1.2 ≤ R2/R1 ≤ 2.

The image-side surface S4 of the second lens element L2 has a fourth radius of curvature R4 and an optical effective diameter Φ 4. In one embodiment, the optical lenses OL1 and OL2 can satisfy at least one condition of the conditions of phi 4/R4 being more than or equal to 1.6, phi 4/R4 being more than or equal to 1.7, phi 4/R4 being more than or equal to 1.8, phi 4/R4 being less than or equal to 1.925, phi 4/R4 being less than or equal to 1.93, phi 4/R4 being less than or equal to 1.95, and phi 4/R4 being less than or equal to 2. The optical effective diameter Φ 4 may be the diameter of the image-side surface S4 of the second lens L2.

Furthermore, in one embodiment, the optical lenses OL1 and OL2 can satisfy at least one of the conditions of D/Y ≥ 0.6, D/Y ≥ 0.7, D/Y ≥ 0.8, D/Y ≤ 1.85, D/Y ≤ 2.2, D/Y ≤ 0.6, D/Y ≤ 1.85, D/Y ≤ 0.6, D/Y ≤ 2.2, D/Y ≤ 0.7, D/Y ≤ 1.85, D/Y ≤ 0.7, D/Y ≤ 2.2, D/Y ≤ 0.8, D/Y ≤ 1.85, D/Y ≤ 0.8, and D/Y ≤ 2, and D/Y ≤ 0.8. Wherein D may be an effective outer diameter of the ninth lens L9, including but not limited to an optical effective diameter, a physical effective diameter, or an outer diameter.

Specifically, the ninth lens L9 may be the lens closest to the image side of the second lens group G2, but is not limited to the present invention. In another embodiment, one or more lens (not shown) with refractive power may be further included between the ninth lens element L9 and the image plane I, and D may be an effective outer diameter of the ninth lens element L9, an effective outer diameter of any lens between the ninth lens element L9 and the image plane I, or an effective outer diameter of a lens closest to the image side in the second lens group G2.

In addition, the first lens L1 has an abbe number V1 and a refractive index N1, the second lens L2 has an abbe number V2 and a refractive index N2, the third lens L3 has an abbe number V3 and a refractive index N3, the fourth lens L4 has an abbe number V4 and a refractive index N4, the fifth lens L5 has an abbe number V5 and a refractive index N5, the sixth lens L6 has an abbe number V6 and a refractive index N6, the seventh lens L7 has an abbe number V7 and a refractive index N7, the eighth lens L8 has an abbe number V8 and a refractive index N8, and the ninth lens L9 has an abbe number V9 and a refractive index N9. In one embodiment, the optical lenses OL1 and OL2 can meet the requirements that N1-N3 are more than or equal to 0.1, N3-N3 are more than or equal to 0, N3-N3 are more than or equal to 0.1, N3-N3 are more than or equal to 0, and V36, at least one condition of V2-V1 > 0, V3-V1 > 10, V3-V1 > 5, V3-V4 > 10, V3-V4 > 5, V8-V9 > 10, V8-V9 > 5, V8-V7 > 10, V8-V7 > 5, V8-V6 > 10, V8-V6 > 5, V8-V5 > 10, V8-V5 > 5, V6-V7 > 10, V6-V7 > 5, V6-V5 > 0 and the like.

In addition, in an 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, the seventh lens L7, the eighth lens L8, and the ninth lens L9 may all be made of glass; in another embodiment, at least one of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the ninth lens L9 may be a plastic lens made of plastic material. The material of the plastic lens 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 a mixture and/or compound material including at least one of the foregoing.

In an embodiment, 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, the seventh lens element L7, the eighth lens element L8, and the ninth lens element L9 may be a spherical lens element, a free-form lens element, or an aspheric lens element, respectively. For example, the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are spherical lenses, and the third lens L3 is an aspherical lens or a free-form lens; alternatively, the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are spherical lenses, and the third lens L3 and the ninth lens L9 are aspherical lenses or free-form-surface lenses, respectively.

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:

where Z is a coordinate value in the optical axis OA direction, the light transmission direction is the positive direction, a4, a6, A8, a10, a12, a14, and a16 are aspheric coefficients, K is a conic constant, C is 1/R, R is a radius of curvature, Y is a coordinate value orthogonal to the optical axis OA direction, and the direction away from the optical axis OA is the 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, the object-side surfaces S1, S3, and S5 of the first lens element L1, the second lens element L2, and the third lens element L3 of the optical lens OL1 may have positive refractive indexes, which are convex surfaces respectively protruding toward the object side; the image-side surfaces S2, S4, and S6 may have positive refractive indexes, which are concave toward the object side. Further, the first lens L1, the second lens L2, and the third lens L3 may employ lenses having optical power, respectively, including, but not limited to, convex-concave plastic lenses or convex-concave glass lenses having positive optical power or convex-concave plastic lenses or convex-concave glass lenses having negative optical power. For example, the first lens L1 may be a convex-concave glass lens having a positive refractive power, and the second lens L2 and the third lens L3 may be a convex-concave plastic lens or a convex-concave glass lens having a negative refractive power, respectively. The object-side surfaces S1 and S3 and the image-side surfaces S2 and S4 may be spherical surfaces, or at least one of the surfaces may be an aspheric surface or a free-form surface; the object-side surface S5 and the image-side surface S6 may be aspheric surfaces and/or free-form surfaces, respectively.

Next, the fourth lens L4, the sixth lens L6, the eighth lens L8, and the ninth lens L9 may be lenses having diopters, respectively. The object-side surfaces S7, S11, S15 and S17 of the fourth lens element L4, the sixth lens element L6, the eighth lens element L8 and the ninth lens element L9 respectively have positive refractive indexes and are convex surfaces protruding toward the object side; the image-side surfaces S8, S12, S16 and S18 may have negative refractive indexes, which are convex surfaces respectively protruding toward the image side. In other words, the fourth lens element L4, the sixth lens element L6, the eighth lens element L8, and the ninth lens element L9 may be, but not limited to, biconvex lenses having positive refractive power.

In another embodiment, the sixth lens L6 and the eighth lens L8 may also adopt a meniscus lens or a convex-concave lens with positive or negative refractive power, respectively. For example, the fourth lens L4 and the ninth lens L9 may be lenticular glass lenses or lenticular plastic lenses having a positive refractive power; the sixth lens L6 and the eighth lens L8 may be a double convex glass lens, a concave-convex glass lens, or a convex-concave glass lens having a positive refractive power, or a concave-convex glass lens or a convex-concave glass lens having a negative refractive power, respectively. In addition, the object-side surfaces S7, S11, S15, S17 and the image-side surfaces S8, S12, S16, S18 may all be spherical surfaces, or at least one of the surfaces may be an aspheric surface or a free-form surface.

Moreover, the object-side surface S9 of the fifth lens element L5 can have a negative refractive index, and can be concave towards the image side or convex; the image-side surface S10 may have a negative refractive index, which may be convex or concave toward the image side. Further, the fifth lens element L5 can be a lens with positive refractive power or negative refractive power, including but not limited to a concave-convex or biconvex plastic lens or a concave-convex or biconvex glass lens, and the object-side surface S9 and the image-side surface S10 can be a spherical surface, an aspheric surface or a free-form surface, respectively.

Moreover, the object-side surface S13 of the seventh lens element L7 may have a negative refractive index, which may be concave toward the image side; the image-side surface S14 may have a positive refractive index, and may be concave toward the object side. In another embodiment, the seventh lens L7 can be a lens with negative or positive refractive power, including but not limited to a biconcave lens with negative or positive refractive power, or a convex-concave or a concave-convex lens with negative or positive refractive power, wherein the seventh lens L7 can be a glass lens or a plastic lens. The object-side surface S13 and the image-side surface S14 may be spherical surfaces, aspheric surfaces, or free-form surfaces, respectively, but not limited thereto.

For example, the sixth lens element L6, the seventh lens element L7, and the eighth lens element L8 form a compound lens, and an image-side surface S12 of the sixth lens element L6, an object-side surface S13 of the seventh lens element L7, and an object-side surface S14 and an object-side surface S15 of the eighth lens element L8 are matched with each other. In other words, if the image side surfaces S12, S14 are concave toward the object side, the object side surfaces S13, S15 are convex toward the object side; if the image-side surfaces S12, S14 are convex toward the image side, the object-side surfaces S13, S15 are concave toward the image side.

Furthermore, the optical lenses OL1, OL2 may further include a stop St and/or a protective sheet C. In addition, an image capturing unit (not shown) may be disposed on the image plane I, and may perform photoelectric conversion on the light beams passing through the optical lenses OL1 and OL 2. The stop St may be disposed between any two lenses L1 to L9 of the optical lenses OL1 and OL2, the object side of the first lens L1, or between the ninth lens L9 and the image plane I, for example, between the fourth lens L4 and the fifth lens L5, but not limited thereto; the protect sheet C may also be disposed between the ninth lens L9 and the image forming surface I.

On the other hand, the optical lenses OL1, OL2 may further include a filter F, and the filter F may be disposed between the ninth lens L9 and the protection sheet C. Moreover, in another embodiment, the protection sheet C can have the functions of protecting the image capturing unit and filtering the infrared beam, and the filter F can be omitted.

Fig. 3A shows lens parameters of the optical lens OL1 of fig. 1 according to the present invention, which include curvature radius, thickness, refractive index, abbe number (abbe number), lens diameter, cone constant (conic constant), 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 surfaces S2 …, "S19" and "S20" of the first lens L1 respectively represent the object-side surface S19 and the image-side surface S20 of the filter F, "S21" and "S22" represent the object-side surface S21 and the image-side surface S22 of the protective sheet C, respectively, and so on. In addition, the "thickness" represents the distance between the surface and a surface adjacent to the image side, for example, the "thickness" of the object-side surface S1 is the distance between the object-side surface S1 of the first lens element L1 and the image-side surface S2 of the first lens element L1; the "thickness" of the image-side surface S2 is the distance between the image-side surface S2 of the first lens element L1 and the object-side surface S3 of the second lens element L2.

Fig. 3B shows aspheric coefficients of the optical lens OL1 of fig. 1 according to the present invention. If the object-side surface S5 and the image-side surface S6 of the third lens element L3 of the optical lens OL1 are aspheric surfaces, coefficients of the aspheric surface equations are as shown in fig. 3B.

Fig. 4A shows a distortion (distortion) graph of the optical lens OL1 according to an embodiment of the invention. Wherein the distortion rate of the light beam is controlled within a good range.

Fig. 4B shows a field curvature (field curvature) graph of the optical lens OL1 according to an embodiment of the present invention, wherein a curve T, S shows chromatic aberration of the optical lens OL1 for Tangential light beam (tagential Rays) and Sagittal light beam (Sagittal Rays), respectively. Wherein, the tangential field curvature value and the sagittal field curvature value of the light beam are controlled in a good range.

Fig. 5 is a peripheral luminance graph of the optical lens OL1 according to an embodiment of the invention. As shown in fig. 5, with the positive refractive double-convex lens of the ninth lens L9 of the optical lens OL1, the optical main beam angle (CRA) can be effectively reduced, and the peripheral brightness of the optical lens OL1 can be effectively improved.

As further shown in fig. 2, optical lens OL2 is substantially similar to optical lens OL1, and the elements have substantially the same reference numerals. The main difference between the optical lens OL2 and the optical lens OL1 is: the sixth lens L6 and the seventh lens L7 of the optical lens OL2 constitute a compound lens, and a distance exists between the seventh lens L7 and the eighth lens L8. Wherein the image-side surface S12 of the sixth lens L6 and the object-side surface S13 of the seventh lens L7 match each other. If the image side surface S12 is concave toward the object side, the object side surface S13 is convex toward the object side; if the image-side surface S12 is convex toward the image side, the object-side surface S13 is concave toward the image side.

Fig. 6A illustrates lens parameters of the optical lens OL2 of fig. 2 according to the present invention, which are defined and intended to be substantially the same as fig. 3A.

Fig. 6B shows aspheric coefficients of the optical lens OL2 of fig. 2 according to the present invention. If the object-side surface S5 and the image-side surface S6 of the third lens element L3 of the optical lens OL2 are aspheric surfaces, coefficients of each aspheric mathematical expression are as shown in fig. 6B.

FIG. 7 shows an optical lens OL3 according to another embodiment of the present invention; fig. 8A lists the lens parameters of the optical lens OL3 of fig. 7 of the present invention. As shown in fig. 7, optical lens OL3 is substantially similar to optical lens OL1, and the elements follow substantially the same symbols; the definitions of the lens parameters in fig. 8A are substantially the same as those in fig. 3A.

In one embodiment, the first lens L1, the fourth lens L4 and the ninth lens L9 of the optical lens OL3 may have positive refractive power; the second lens L2 and the third lens L3 may have negative refractive power; the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 may have positive or negative refractive power, respectively.

In one embodiment, the first lens L1, the sixth lens L6, the seventh lens L7 and the eighth lens L8 of the optical lens OL3 are glass lenses; the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the ninth lens L9 can be glass lenses or plastic lenses, respectively.

Fig. 8B shows aspheric coefficients of the optical lens OL3 of fig. 7 according to the present invention. In one embodiment, the third lens element L3 and the ninth lens element L9 of the optical lens element OL3 are aspheric lenses, and coefficients of aspheric terms of the object-side surfaces S5 and S17 and the image-side surfaces S6 and S18 of the third lens element L3 and the ninth lens element L9 are as shown in fig. 8B; the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are spherical lenses.

Fig. 9 is a diagram showing optical data of the optical lenses OL1, OL2, OL3 of fig. 3A, 3B, 6A, 6B, 8A and 8B.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An optical lens having an image height Y, comprising:

a first lens group, sequentially from an object side to an image side, comprising:

a first lens having a refractive power;

a second lens having a negative refractive power;

a third lens having a negative refractive power; and

a fourth lens having a positive refractive power; and

and the second lens group with positive diopter comprises five lenses, wherein the lens closest to the image side has positive diopter, the lens has an effective radius D, and D/Y is more than or equal to 0.6 and less than or equal to 2.2.

2. The optical lens assembly as claimed in claim 1, wherein the second lens group at least includes, in order from an object side to an image side, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element and a ninth lens element with refractive power; the sixth lens element, the seventh lens element and the eighth lens element form a compound lens element, or the sixth lens element and the seventh lens element form the compound lens element, or the seventh lens element and the eighth lens element form the compound lens element.

3. The optical lens assembly according to claim 1 or 2, further comprising a total focal length F, and d is a distance between the fourth lens and the second lens group; the optical lens meets the condition that d/F is more than or equal to 0.15 and less than or equal to 0.85.

4. The optical lens of claim 2, wherein any one of the sixth lens element, the seventh lens element and the eighth lens element has a negative refractive power, and the other two have a positive refractive power; the first lens, the fifth lens and the ninth lens have positive diopter, and the compound lens has negative diopter.

5. The optical lens of claim 1, wherein the lens closest to the image side of the second lens group is a biconvex lens.

6. The optical lens assembly of claim 1 further comprising a total focal length F, a total length TTL, an angle of view FOV, and an aperture FNO; the optical lens satisfies at least one of the following conditions: F/TTL is more than or equal to 0 and less than or equal to 0.25, F/Y is more than or equal to 0.8 and less than or equal to 1.2, FOV is more than or equal to 70 degrees and less than or equal to 115 degrees, and (FNO xTTL)/(FOV xY) is more than or equal to 0 and less than or equal to 0.4; wherein the total length is a distance from the object side surface of the first lens to an imaging surface.

7. The optical lens system of claim 2, wherein an object-side surface of the first lens element has a first radius of curvature R1, an image-side surface of the first lens element has a second radius of curvature R2, an image-side surface of the second lens element has a fourth radius of curvature R4 and an optical effective diameter Φ 4, the fourth lens element has an abbe number V4, and the ninth lens element has an abbe number V9; the optical lens satisfies at least one of the following conditions: the | R2/R1 | is more than or equal to 0.8 and less than or equal to 2, the phi 4/R4 is more than or equal to 1.6 and less than or equal to 2, the V4 is more than or equal to 35 and less than or equal to 60, and the V9 is more than or equal to 50 and less than or equal to 85.

8. An optical lens as claimed in claim 2, characterized in that the first lens has an abbe number V1 and a refractive index N1, the second lens has an abbe number V2 and a refractive index N2, the third lens has an abbe number V3 and a refractive index N3, the fourth lens has an abbe number V4 and a refractive index N4, the fifth lens has an abbe number V5 and a refractive index N5, the sixth lens has an abbe number V6 and a refractive index N6, the seventh lens has an abbe number V7 and a refractive index N7, the eighth lens has an abbe number V8 and a refractive index N8, the ninth lens has an abbe number V9 and a refractive index N9, and the optical lens satisfies at least one of the following conditions: N1-N3 > 0, N2-N3 > 0, N4-N3 > 0, N7-N8 > 0, N7-N6 > 0, N7-N5 > 0, N5-N6 > 0, N9-N8 > 0, V2-V1 > 0, V3-V1 > 5, V3-V4 > 5, V8-V9 > 5, V8-V7 > 5, V8-V6 > 5, V8-V5 > 3875, V6-V7 > 5, and V6-V5 > 10.

9. An optical lens barrel according to claim 2, wherein the first lens is a meniscus lens, the second lens is a meniscus lens, the third lens is a meniscus lens and/or an aspherical lens, the fourth lens is a biconvex lens, the fifth lens is a meniscus or biconvex lens, the sixth lens is a biconvex lens or a meniscus lens, the seventh lens is a biconcave lens or a meniscus lens, the eighth lens is a biconvex lens or a meniscus lens, or the ninth lens is a biconvex lens and/or an aspherical lens.

10. An optical lens having an image height Y, comprising:

a first lens having a refractive power;

a second lens having a negative refractive power;

a third lens having a negative refractive power; and

a fourth lens having a positive refractive power; and

and a second lens group comprising five lenses, wherein the five lenses at least comprise a compound lens and a lens with positive diopter, and the lens closest to the image side of the second lens group has an effective radius D, and D/Y is more than or equal to 0.6 and less than or equal to 2.2.

11. The optical lens assembly as claimed in claim 10, wherein the second lens group at least includes, in order from an object side to an image side, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element and a ninth lens element with refractive power; the sixth lens, the seventh lens and the eighth lens form the compound lens, or the sixth lens and the seventh lens form the compound lens, or the seventh lens and the eighth lens form the compound lens.

12. The optical lens of claim 11, wherein any one of the sixth lens element, the seventh lens element and the eighth lens element has a negative refractive power, and the other two have a positive refractive power; the first lens, the fifth lens and the ninth lens have positive diopter, and the compound lens has negative diopter.

13. The optical lens assembly as claimed in claim 10, wherein the lens closest to the image side of the second lens group is a biconvex lens.

14. The optical lens assembly of claim 10 further comprising a total focal length F, a total length TTL, an angle of view FOV, and an aperture FNO; the optical lens satisfies at least one of the following conditions: F/TTL is more than or equal to 0 and less than or equal to 0.25, F/Y is more than or equal to 0.8 and less than or equal to 1.2, FOV is more than or equal to 70 degrees and less than or equal to 115 degrees, and (FNO xTTL)/(FOV xY) is more than or equal to 0 and less than or equal to 0.4; wherein the total length is a distance from the object side surface of the first lens to an imaging surface.

15. The optical lens system of claim 11, wherein an object-side surface of the first lens element has a first radius of curvature R1, an image-side surface of the first lens element has a second radius of curvature R2, an image-side surface of the second lens element has a fourth radius of curvature R4 and an optical effective diameter Φ 4, the fourth lens element has an abbe number V4, and the ninth lens element has an abbe number V9; the optical lens satisfies at least one of the following conditions: the | R2/R1 | is more than or equal to 0.8 and less than or equal to 2, the phi 4/R4 is more than or equal to 1.6 and less than or equal to 2, the V4 is more than or equal to 35 and less than or equal to 60, and the V9 is more than or equal to 50 and less than or equal to 85.

16. An optical lens of claim 11, wherein the first lens has an abbe number V1 and a refractive index N1, the second lens has an abbe number V2 and a refractive index N2, the third lens has an abbe number V3 and a refractive index N3, the fourth lens has an abbe number V4 and a refractive index N4, the fifth lens has an abbe number V5 and a refractive index N5, the sixth lens has an abbe number V6 and a refractive index N6, the seventh lens has an abbe number V7 and a refractive index N7, the eighth lens has an abbe number V8 and a refractive index N8, the ninth lens has an abbe number V9 and a refractive index N9, and the optical lens satisfies at least one of the following conditions: N1-N3 > 0, N2-N3 > 0, N4-N3 > 0, N7-N8 > 0, N7-N6 > 0, N7-N5 > 0, N5-N6 > 0, N9-N8 > 0, V2-V1 > 0, V3-V1 > 5, V3-V4 > 5, V8-V9 > 5, V8-V7 > 5, V8-V6 > 5, V8-V5 > 3875, V6-V7 > 5, and V6-V5 > 10.

17. An optical lens barrel according to claim 11, wherein the first lens is a meniscus lens, the second lens is a meniscus lens, the third lens is a meniscus lens and/or an aspherical lens, the fourth lens is a biconvex lens, the fifth lens is a meniscus or biconvex lens, the sixth lens is a biconvex lens or a meniscus lens, the seventh lens is a biconcave lens or a meniscus lens, the eighth lens is a biconvex lens or a meniscus lens, or the ninth lens is a biconvex lens and/or an aspherical lens.

18. An optical lens having an image height Y, in order from an object side to an image side, comprising:

a first lens having a refractive power;

a second lens having a negative refractive power;

a third lens having a negative refractive power;

a fourth lens having a positive refractive power;

a fifth lens having a refractive power;

a sixth lens with diopter;

a seventh lens having diopter;

an eighth lens having diopter; and

a ninth lens with positive diopter, wherein the ninth lens has an effective radius D, and D/Y is more than or equal to 0.6 and less than or equal to 2.2;

the sixth lens, the seventh lens and the eighth lens form a compound lens, or the sixth lens and the seventh lens form the compound lens, or the seventh lens and the eighth lens form the compound lens.

19. The optical lens of claim 18, wherein any one of the sixth lens element, the seventh lens element and the eighth lens element has a negative refractive power, and the other two have a positive refractive power; the first lens, the fifth lens and the ninth lens have positive diopter, and the compound lens has negative diopter.

20. An optical lens barrel according to claim 18, wherein the ninth lens is a biconvex lens.

21. The optical lens assembly of claim 18 further comprising a total focal length F, a total length TTL, an angle of view FOV, and an aperture FNO; the optical lens satisfies at least one of the following conditions: F/TTL is more than or equal to 0 and less than or equal to 0.25, F/Y is more than or equal to 0.8 and less than or equal to 1.2, FOV is more than or equal to 70 degrees and less than or equal to 115 degrees, and (FNO xTTL)/(FOV xY) is more than or equal to 0 and less than or equal to 0.4; wherein the total length is a distance from the object side surface of the first lens to an imaging surface.

22. The optical lens system of claim 18, wherein an object-side surface of the first lens element has a first radius of curvature R1, an image-side surface of the first lens element has a second radius of curvature R2, an image-side surface of the second lens element has a fourth radius of curvature R4 and an optical effective diameter Φ 4, the fourth lens element has an abbe number V4, and the ninth lens element has an abbe number V9; the optical lens satisfies at least one of the following conditions: the | R2/R1 | is more than or equal to 0.8 and less than or equal to 2, the phi 4/R4 is more than or equal to 1.6 and less than or equal to 2, the V4 is more than or equal to 35 and less than or equal to 60, and the V9 is more than or equal to 50 and less than or equal to 85.

23. An optical lens of claim 18, wherein the first lens has an abbe number V1 and a refractive index N1, the second lens has an abbe number V2 and a refractive index N2, the third lens has an abbe number V3 and a refractive index N3, the fourth lens has an abbe number V4 and a refractive index N4, the fifth lens has an abbe number V5 and a refractive index N5, the sixth lens has an abbe number V6 and a refractive index N6, the seventh lens has an abbe number V7 and a refractive index N7, the eighth lens has an abbe number V8 and a refractive index N8, the ninth lens has an abbe number V9 and a refractive index N9, and the optical lens satisfies at least one of the following conditions: N1-N3 > 0, N2-N3 > 0, N4-N3 > 0, N7-N8 > 0, N7-N6 > 0, N7-N5 > 0, N5-N6 > 0, N9-N8 > 0, V2-V1 > 0, V3-V1 > 5, V3-V4 > 5, V8-V9 > 5, V8-V7 > 5, V8-V6 > 5, V8-V5 > 3875, V6-V7 > 5, and V6-V5 > 10.

24. An optical lens barrel according to claim 18, wherein the first lens is a meniscus lens, the second lens is a meniscus lens, the third lens is a meniscus lens and/or an aspherical lens, the fourth lens is a biconvex lens, the fifth lens is a meniscus or biconvex lens, the sixth lens is a biconvex lens or a meniscus lens, the seventh lens is a biconcave lens or a meniscus lens, the eighth lens is a biconvex lens or a meniscus lens, or the ninth lens is a biconvex lens and/or an aspherical lens.