TW202008023A - Optical lens - Google Patents

Abstract

An optical lens, from an object side to an image side includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in order. The first lens to the fifth lens has a positive, a negative, a positive, a negative, and a positive refractive power in order. A sixth object-side surface of the sixth lens has a curvature radius R11, a sixth image-side surface of the sixth lens has an effective diameter r, and a substantially vertical distance between an inflection point on the sixth image-side surface and an optic axis is h. The optical lens satisfies at least one of the following conditions: 0.5 ≤ |R2/R1|, |R2/R1| ≤ 2, 2 ≤ |R11/R12|, |R11/R12| ≤ 5, 0.615 ≤ |h/r|, or |h/r| ≤ 0.9.

Description

Optical lens

The invention relates to an optical lens, and in particular to an optical lens with low distortion and large aperture.

With the rise of photography activities, the public's demand for camera devices has increased, and depending on the nature of the camera activities, camera devices must also have different characteristics. For example, when shooting in an environment with different brightness, the light-receiving ability of the camera device needs to be adjusted accordingly; or when shooting in different media, the camera device needs to deal with the distortion caused by the different refractive index of the medium.

In general, if a new optical lens can be proposed, which has the characteristics of low distortion, large aperture, large field of view, small size and low cost, it will be able to meet most of the camera needs. One of the goals.

|h/r|及/或|h/r|

0.9。 In view of this, the present invention discloses an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in order from the object side to the image side. The first lens has positive refractive power. The second lens has negative refractive power. The third lens has positive refractive power. The fourth lens has negative refractive power. The fifth lens has positive refractive power. The sixth lens has a refractive power and includes a sixth image side surface. The radius of the sixth image side surface is r, and the substantially perpendicular distance between the reflex point on the sixth image side surface and the optical axis is h, and 0.615

|h/r| and/or |h/r|

0.9.

|R2/R1|、|R2/R1|

2、2

|R11/R12|及|R11/R12|

5。 The invention also discloses an optical lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in order from the object side to the image side. The first lens has a positive refractive power and includes a first object-side surface and a first image-side surface, the radius of curvature of the first object-side surface is R1, and the radius of curvature of the first image-side surface is R2. The second lens has negative refractive power. The third lens has positive refractive power. The fourth lens has negative refractive power. The fifth lens has positive refractive power. The sixth lens has a refractive power and includes a sixth object-side surface and a sixth image-side surface. The radius of curvature of the sixth object-side surface is R11, the radius of curvature of the sixth image-side surface is R12, and the optical lens satisfies at least one of the following conditions: 0.5

|R2/R1|, |R2/R1|

2, 2

|R11/R12|and |R11/R12|

5.

The invention also discloses an optical lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in order from the object side to the image side. The first lens has positive refractive power and includes a first object-side surface and a first image-side surface. The second lens has negative refractive power. The third lens has positive refractive power. The fourth lens has negative refractive power. The fifth lens has positive refractive power. The sixth lens has a refractive power and includes a sixth object-side surface and a sixth image-side surface. The optical lens satisfies at least one of the following conditions: the first object-side surface is convex, the first image-side surface is convex, the sixth object-side surface is convex, and the sixth image-side surface is concave.

In summary, the optical lens proposed by the present invention has the characteristics of low distortion, large aperture, large field of view, small volume, and low cost.

100‧‧‧Optical lens

A‧‧‧Optical axis

h‧‧‧height

IMA‧‧‧Imaging surface

L1‧‧‧ First lens

L2‧‧‧Second lens

L3‧‧‧third lens

L4‧‧‧ fourth lens

L5‧‧‧fifth lens

L6‧‧‧Sixth lens

f1‧‧‧First optical sheet

f2‧‧‧Second optical sheet

P‧‧‧ points

r‧‧‧radius

S1‧‧‧ First object side surface

S2‧‧‧ First image side surface

S3‧‧‧Second object side surface

S4‧‧‧Second image side surface

S5‧‧‧The third object side surface

S6‧‧‧ third image side surface

S7‧‧‧Fourth object side surface

S8‧‧‧ Fourth image side surface

S9‧‧‧ fifth object side surface

S10‧‧‧Fifth image side surface

S11‧‧‧Sixth object side surface

S12‧‧‧Sixth image side surface

S13, S14, S15, S16, S17

STO‧‧‧Aperture

TTL‧‧‧Lens length

FIG. 1 is a cross-sectional view of an optical lens according to an embodiment of the invention.

FIG. 2 illustrates an embodiment of each lens parameter of the optical lens of FIG. 1.

Figure 3 lists the aspheric mathematical coefficients of the aspheric lens of the embodiment of the optical lens of Figure 1.

FIG. 4 is an enlarged view of the sixth lens in FIG. 1.

In the following, a plurality of embodiments of the present invention will be disclosed in the form of diagrams. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is to say, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventional structures and elements will be shown in a simple schematic manner in the drawings. Moreover, unless otherwise indicated, the same element symbol in different drawings may be regarded as a corresponding element. The drawing in these drawings is for clearly expressing the connection relationship between the elements in these embodiments, not the actual size of the elements.

Please refer to FIG. 1, which illustrates a cross-sectional view of an optical lens 100 according to an embodiment of the present invention. Specifically, FIG. 1 only shows the main optical lens structure of the optical lens 100 of the present invention. The remaining structures, such as lens barrels and other components, can be correspondingly designed by those skilled in the art, and are omitted here. The optical lens 100 has the characteristics of low distortion, large aperture, large viewing angle, small size, and low cost, and can be applied to various devices with image projection or image capture functions, such as: handheld communication systems, aerial cameras, miniature cameras , Sports camera lens, car camera lens, surveillance system, digital camera, digital camera or projector, etc.

In Figure 1, the left side of the figure is defined as the object side, and the IMA direction on the right side of the figure is the image side. The optical lens 100 includes at least six lenses in order from the object side to the image side: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6, and the above Six lenses can be arranged along an optical axis A.

In the present embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may have refractive powers, respectively. In one embodiment, of the six lenses of the optical lens 100, any three of them may have positive refractive power, and the other three may have negative refractive power. In another embodiment, each lens is alternately arranged with positive and negative refractive power; For example, the first lens L1, the third lens L3, and the fifth lens L5 may have positive refractive power, the second lens L2 and the fourth lens L4 may have negative refractive power, and the sixth lens L6 may have positive refractive power or negative refractive power. In addition, in a specific embodiment, the sixth lens L6 has a positive refractive power.

TTL/F。其中，鏡頭總長可以是第一透鏡L1之第一物側表面S1與成像面之間的距離。 Furthermore, in one embodiment, the focal length of the optical lens 100 is F, and the total lens length is TTL, then 1.5

TTL/F. The total lens length may be the distance between the first object-side surface S1 of the first lens L1 and the imaging plane.

F/Y及/或F/Y

1.5。 In one embodiment, the optical lens 100 can condense the incident light beam from the object side onto the imaging plane IMA on the image side, and if the image height of an object on the imaging plane IMA is Y, then 1

F/Y and/or F/Y

1.5.

(FNO*TTL)/(FOV*Y)及/或 (FNO*TTL)/(FOV*Y)

0.05。 In addition, in one embodiment, the field of view of the optical lens 100 is FOV, and the optical lens 100 further includes an aperture STO. The aperture value of the aperture STO is FNO, then 0

(FNO*TTL)/(FOV*Y) and/or (FNO*TTL)/(FOV*Y)

0.05.

|R2/R1|及/或|R2/R1|

2。 In one embodiment, the first lens L1 includes a first object-side surface S1 and a first image-side surface S2. The radius of curvature of the first object-side surface S1 is R1, and the radius of curvature of the first image-side surface S2 is R2, and 0.5

|R2/R1| and/or|R2/R1|

2.

N2、N2

N3、N4

N3、N4

N5、N6

N5、V1

V2、V3

V2、V3

V4、V5

V4及V5

V6之至少一條件。 Furthermore, in one embodiment, the first lens L1 has a refractive index N1 and an Abbe number V1, the second lens L2 has a refractive index N2 and an Abbe number V2, and the third lens L3 has a refractive index N3 and an Abbe number V3, The fourth lens L4 has a refractive index N4 and an Abbe number V4, the fifth lens L5 has a refractive index N5 and an Abbe number V5, the sixth lens L6 has a refractive index N6 and an Abbe number V6, and the optical lens 100 satisfies N1

N2, N2

N3, N4

N3, N4

N5, N6

N5, V1

V2, V3

V2, V3

V4, V5

V4 and V5

At least one condition of V6.

0.05、N2-N3

0.05、N4-N3

0.05、N4-N5

0.05、N6-N5

0.05、V1-V2

5、V3-V2

5、V3-V4

5、V5-V4

5及V5-V6

5之至少一條件。 In another embodiment, the optical lens 100 satisfies N1-N2

0.05, N2-N3

0.05, N4-N3

0.05, N4-N5

0.05, N6-N5

0.05, V1-V2

5. V3-V2

5. V3-V4

5. V5-V4

5 and V5-V6

At least one condition of 5.

|P5|

|P3|

|P2|

|P1|

|P4|。即，除了第四透鏡L4以外，越靠近像側的透鏡具有越高的屈光度絕對值。 In one embodiment, the first lens L1 has a refractive power P1, the second lens L2 has a refractive power P2, the third lens L3 has a refractive power P3, the fourth lens L4 has a refractive power P4, the fifth lens L5 has a refractive power P5 and the sixth lens L6 has Diopter P6, and |P6|

|P5|

|P3|

|P2|

|P1|

|P4|. That is, with the exception of the fourth lens L4, the lens closer to the image side has a higher absolute value of refractive power.

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, and the sixth lens L6 may be a glass lens made of glass material or A plastic lens made of plastic material. The plastic lens material may include, but is not limited to, polycarbonate, cyclic olefin copolymer (such as APEL), and polyester resin (such as OKP4 or OKP4HT), etc., or may include the above three Mixing and/or compounding materials of at least one. Specifically, in one embodiment, the first lens L1 is a glass lens; in another embodiment, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are plastic lenses or Glass lens.

In addition, in one embodiment, the second lens L2, the fourth lens L4, and the sixth lens L6 may be made of the same material, or made of materials with the same refractive index and Abbe number; in another embodiment, The third lens L3 and the fifth lens L5 can be made of the same material, or made of materials with the same refractive index and Abbe number. In still another embodiment, the second lens L2, the fourth lens L4, and the sixth lens L6 have the same refractive index and/or Abbe number, and/or the third lens L3 and the fifth lens L5 have the same refractive index and/or Abbe number.

Furthermore, in an embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 may be a spherical lens, a free-form lens or a lens Aspheric lens. In a specific embodiment, at least one of the first lens L1, the second lens L2, the fourth lens L4, the seventh lens L7, and the eighth lens L8 is an aspheric lens. Specifically, in an embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspheric lenses.

Specifically, each free-form surface lens has at least one free-form surface, meaning that the object-side surface and/or image-side surface of the free-form surface lens is a free-form surface; and each aspherical lens has at least one aspherical surface, meaning That is, the object-side surface and/or image-side surface of the aspheric lens is an aspheric surface. And each aspheric surface can satisfy the following mathematical formula:

Among them, Z is the 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 the quadratic surface constant, C=1/ R, R is the radius of curvature, Y is the coordinate value orthogonal to the direction of the optical axis OA, and the direction away from the optical axis OA is the positive direction. In addition, the value of each parameter or coefficient of each aspheric surface mathematical formula can be set separately to determine the focal length of each position point of the aspheric surface.

FIG. 2 illustrates an embodiment of each lens parameter of the optical lens 100 of FIG. 1, which includes the radius of curvature, thickness, refractive index, Abbe number (dispersion coefficient), etc. of each lens. The surface codes of the lenses are arranged in order from the object side to the image side, for example: "St" stands for aperture St, "S1" stands for the first object side surface S1 of the first lens L1, and "S2" stands for the first lens L1. The first image-side surface S2, etc., "S13" and "S14" represent the surface S13 of the first optical sheet f1 toward the object side and the surface S14 toward the image side, etc., respectively. In addition, "thickness" represents the distance between this surface and a surface adjacent to the image side. For example, the "thickness" of the first object-side surface S1 is the first object-side surface S1 and the first image-side surface S2 of the first lens L1. The distance between; the "thickness" of the first image side surface S2 is the distance between the first image side surface S2 and the object side surface S3 of the second lens L2.

FIG. 3 lists the aspheric mathematical coefficients of the aspheric lens of one embodiment of the optical lens 100 of FIG. 1. If the surfaces S1 to S12 of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 of the optical lens 100 are aspherical surfaces, respectively, their respective non-spherical surfaces The coefficients of the spherical mathematical formula can be shown in Figure 3.

Referring to FIGS. 1 to 3, the first object-side surface S1 of the first lens L1 may have a positive refractive power, and the first image-side surface S2 may have a negative refractive power. The first object-side surface S1 may be a convex surface convex toward the object side, and the first image-side surface S2 may be a convex surface convex toward the image side. Further, the first lens L1 may adopt a lens with positive refractive power, including but not limited to any one or combination of a lenticular lens with positive refractive power, a glass or plastic lens, and a spherical or aspherical lens.

The second object-side surface S3, the fourth object-side surface S7, the second image-side surface S4, and the fourth image-side surface S8 of the second lens L2 and the fourth lens L4 may all have positive refractive power. The second object-side surface S3 and the fourth object-side surface S7 may be convex surfaces respectively protruding toward the object side, and the second image-side surface S4 and the fourth image-side surface S8 may be concave surfaces concave toward the object side, respectively. Further, the second lens L2 and the fourth lens L4 may respectively use negative refractive power lenses, including but not limited to any one or combination of convex and concave lenses, glass or plastic lenses having negative refractive power, and spherical or aspherical lenses.

The third object side surface S5, the fifth object side surface S9, the third image side surface S6, and the fifth image side surface S10 of the third lens L3 and the fifth lens L5 may all have negative refractive power. The third object-side surface S5 and the fifth object-side surface S9 may be concave surfaces concave toward the image side, respectively, and the third image-side surface S6 and the fifth image-side surface S10 may be convex surfaces convex toward the image side, respectively. Further, the third lens L3 and the fifth lens L5 may adopt lenses with positive refractive power, including but not limited to any one or combination of meniscus lenses, glass or plastic lenses with positive refractive power, and spherical or aspherical lenses.

The sixth object-side surface S11 and the sixth image-side surface S12 of the sixth lens L6 may both have positive refractive power at the optical axis OA, and the sixth object-side surface S11 may be concave or concave toward the image side as a whole The object side is convex, and the sixth image side surface S12 may be a concave surface that is concave toward the object side as a whole. Further, the sixth lens L6 may adopt a lens with negative refractive power, including but not limited to any one or combination of convex-concave or biconcave lenses with negative refractive power, glass or plastic lenses, and spherical or aspherical lenses.

|R11/R12|及/或|R11/R12|

5。 FIG. 4 shows an enlarged view of the sixth lens L6 in FIG. 1. As shown in FIGS. 2 to 4, the radius of curvature of the sixth object-side surface S11 of the sixth lens L6 is R11, and the radius of curvature of the sixth image-side surface S12 is R12, and 2

|R11/R12|and/or|R11/R12|

5.

5的條件。 In another embodiment, the optical lens 100 may also satisfy |(R11-R12)/(R11+R12)|

5 conditions.

In addition to the above features, the sixth image-side surface S12 of the sixth lens L6 is further convex toward the image side at a position away from the optical axis A. The sixth image side surface S12 changes its radius of curvature from positive to negative refractive power from the center to the direction away from the optical axis, and thus forms an inverse curvature point P on the sixth side surface S12. Thus, the inflection point P is the point closest to the imaging plane IMA on the sixth image side surface S12. In other words, the sixth image side surface S12 is recessed toward the object side at a position crossing the optical axis A, and convex toward the image side at the position of the reflex point P.

The position setting of the inflection point P on the sixth lens L6 can further reduce the distortion value of the optical lens 100 and improve the resolution of the optical lens 100, that is, the modulation transfer function (MTF) Optical characteristics.

|h/r| 及/或|h/r|

0.9。 In one embodiment, the radius of the sixth image-side surface S12 of the sixth lens L6 is r, and the substantially perpendicular distance between the reflex point P and the optical axis A is h, and 0.615

|h/r| and/or |h/r|

0.9.

Further, in a specific embodiment, the sixth image side surface S12 has more than one inflection point P, and the inflection point P closest to the imaging plane satisfies the foregoing condition.

Thus, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 combine to form the optical lens 100, so that the optical lens 100 has a low distortion value and a high resolution Characteristics.

In one embodiment, the optical lens 100 may further include an aperture St, a first optical sheet f1 and/or a second optical sheet f2, and an image capturing unit (not shown) may be provided on the imaging surface IMA, which may The incident light beam passing through the optical lens 100 undergoes photoelectric conversion. The aperture STO can control the amount of incident light and the relative angle between the incident light penetrating the aperture STO and the optical axis A, which can effectively shorten the lens size. The aperture SOT can be disposed on the object side of the first lens L1, but not as Limit, the aperture SOT may also be disposed between any two lenses or between the sixth lens L6 and the imaging surface IMA; the first optical sheet f1 is an infrared filter (IR filter), and the second optical sheet f2 is a transparent protective glass. In other embodiments, the first optical sheet f1 and the second optical sheet f2 can also be integrated into an optical element and achieve substantially the same effect.

In summary, the optical lens proposed by the present invention has the characteristics of low distortion, large aperture, large field of view, small volume, and low cost, and the first lens L1, the second lens L2, the third lens L3, and the fourth lens The L4, the fifth lens L5, and the sixth lens L6 may be independent of each other, and the optical lens 100 as a whole has the advantage of a simple manufacturing process.

The present invention has been described by examples and the above embodiments, and it should be understood that the present invention is not limited to the disclosed embodiments. On the contrary, the present invention covers a variety of altered and approximate arrangements (e.g., as would be apparent to those of ordinary skill in the art). Therefore, the additional request should be based on the widest interpretation to cover all such changes and approximate arrangements.

100‧‧‧Optical lens

A‧‧‧Optical axis

IMA‧‧‧Imaging surface

L1‧‧‧ First lens

L2‧‧‧Second lens

L3‧‧‧third lens

L4‧‧‧ fourth lens

L5‧‧‧fifth lens

L6‧‧‧Sixth lens

f1‧‧‧First optical sheet

f2‧‧‧Second optical sheet

S1‧‧‧ First object side surface

S2‧‧‧ First image side surface

S3‧‧‧Second object side surface

S4‧‧‧Second image side surface

S5‧‧‧The third object side surface

S6‧‧‧ third image side surface

S7‧‧‧Fourth object side surface

S8‧‧‧ Fourth image side surface

S9‧‧‧ fifth object side surface

S10‧‧‧Fifth image side surface

S11‧‧‧Sixth object side surface

S12‧‧‧Sixth image side surface

S13, S14, S15, S16, S17

STO‧‧‧Aperture

TTL‧‧‧Lens length

Claims (10)

An optical lens has an optical axis, and includes, in order from the object side to the image side, a first lens with positive power; a second lens with negative power; a third lens with positive power; a fourth lens , With negative refractive power; a fifth lens with positive refractive power; and a sixth lens with refractive power and including a sixth image side surface, the radius of the sixth image side surface is r, and the sixth image side surface The substantially perpendicular distance between an inflexion point and the optical axis is h, and 0.615

|h/r| and/or |h/r|

0.9. An optical lens includes, in order from the object side to the image side, a first lens having a positive refractive power and including a first object side surface and a first image side surface, the radius of curvature of the first object side surface is R1 The radius of curvature of the first image side surface is R2; a second lens with negative power; a third lens with positive power; a fourth lens with negative power; a fifth lens with positive power; and A sixth lens has a refractive power and includes a sixth object-side surface and a sixth image-side surface, the radius of curvature of the sixth object-side surface is R11, the curvature radius of the sixth image-side surface is R12, and the The optical lens meets at least one of the following conditions: 0.5

|R2/R1|, |R2/R1|

2, 2

|R11/R12|and |R11/R12|

5. The optical lens according to claim 2, wherein the optical lens further satisfies |(R1-R2)/(R1+R2)|

5 and/or|(R11-R12)/(R11+R12)|

5. An optical lens includes, in order from the object side to the image side, a first lens with positive refractive power, including a first object side surface and a first image side surface; a second lens with negative refractive power; a first Three lenses with positive refractive power; a fourth lens with negative refractive power; a fifth lens with positive refractive power; and a sixth lens with refractive power and including a sixth object-side surface and a sixth image-side surface, And the optical lens satisfies at least one of the following conditions: the first object-side surface is convex, the first image-side surface is convex, the sixth object-side surface is convex, and the sixth image-side surface is concave. The optical lens according to any one of claims 1, 2, and 4, wherein the first lens is a glass lens, and/or the second lens, the third lens, the fourth lens, the fifth lens and The sixth lens is a plastic lens or a glass lens, respectively. The optical lens according to any one of claims 1, 2, and 4, wherein the optical lens satisfies at least one of the following conditions: the second lens is a convex-concave lens, the third lens is a concave-convex lens, the first The four lenses are a convex-concave lens, the fifth lens is a concave-convex lens, and the sixth lens is a convex-concave lens. The optical lens according to any one of items 1, 2, and 4, wherein the focal length of the optical lens is F, the total lens length is TTL, and 1.5

TTL/F. If the optical lens according to any one of claims 1, 2, and 4 further includes an aperture, the aperture has an aperture value of FNO, the focal length of the optical lens is F, the image height is Y, and the field of view is FOV, Then 0

(FNO*TTL)/(FOV*Y) and/or (FNO*TTL)/(FOV*Y)

0.05. If the optical lens of any one of items 1, 2, and 4 of the request item, wherein the image height of the imaging surface of the optical lens is Y, and the focal length of the optical lens is F, then 1

F/Y and/or F/Y

1.5. The optical lens according to any one of claims 1, 2, and 4, wherein the first lens has a refractive index N1, an Abbe number V1, the second lens has a refractive index N2, an Abbe number V2, and the third The lens has a refractive index N3 and an Abbe number V3, 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, and the sixth lens has a refractive index N6 and Abbe number Number V6, and the optical lens meets at least one of the following conditions: N1

N2, N2

N3, N4

N3, N4

N5, N6

N5, V1

V2, V3

V2, V3

V4, V5

V4 and V5

V6.

Images