CN114217423B

CN114217423B - Optical lens and VR equipment

Info

Publication number: CN114217423B
Application number: CN202111668957.XA
Authority: CN
Inventors: 张恒溢; 张振超
Original assignee: Shanghai Moruan Communication Technology Co Ltd
Current assignee: Shanghai Moruan Communication Technology Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2023-07-14
Anticipated expiration: 2041-12-30
Also published as: CN114217423A

Abstract

The invention discloses an optical lens and VR equipment, which comprises a first lens and a sixth lens which are sequentially arranged from an object side to an image side, wherein the object side and the image side of the first lens and the fifth lens are respectively concave surfaces and convex surfaces, the object side and the image side of the second lens and the sixth lens are respectively concave surfaces, and the object side and the image side of the third lens and the fourth lens are respectively convex surfaces and concave surfaces; a diaphragm is arranged between the third lens and the fourth lens, and an optical filter is arranged between the sixth lens and the imaging surface. According to the invention, the focal power and the surface shape of each lens are reasonably matched, so that the MTF value from the central view field to the edge of the lens is comprehensively improved, and meanwhile, the lens has more excellent chromatic aberration and distortion correction performance, so that better imaging quality is obtained.

Description

Optical lens and VR equipment

Technical Field

The invention relates to the technical field of optical imaging, in particular to an optical lens and VR equipment.

Background

With the continuous development of VR technology and AR technology, fish-eye lenses are widely used in intelligent devices such as VR glasses and AR integrated machines. A fisheye lens is a lens having a focal length of 16mm or less and a view angle of approximately 180 ° or more, and is an extreme wide-angle lens. The front lens of the photographic lens is short in diameter and protrudes towards the front of the lens in a parabolic shape so as to enable the lens to achieve the maximum photographic visual angle.

However, the existing fisheye lens still has the following disadvantages:

1) The optical design correction of the monochromatic and complex chromatic aberration is not ideal due to the existence of larger chromatic aberration;

2) MTF (Modulation Transfer Function ) marginal attenuation is serious, and detection effect is not ideal;

3) Under the condition of large field angle, optical distortion is large.

Disclosure of Invention

The invention provides an optical lens and VR equipment for solving the problems of the optical lens in the prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

an optical lens is provided with a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and an optical filter which are coaxially arranged in sequence from an object side to an image side;

the focal power of the first lens is negative, the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a convex surface;

the focal power of the second lens is positive or negative, the object side surface is a concave surface, and the image side surface is a concave surface;

the focal power of the third lens is positive, the object side surface is a convex surface, and the image side surface is a concave surface;

the focal power of the fourth lens is positive, the object side surface is a convex surface, and the image side surface is a concave surface;

the focal power of the fifth lens is negative, the object side surface is a concave surface, and the image side surface is a convex surface;

the focal power of the sixth lens is positive, the object side surface is a concave surface, and the image side surface is a concave surface;

the optical filter comprises an object side surface and an image side surface which are oppositely arranged and parallel to each other.

Optionally, the optical lens satisfies the following relation:

3＜ZD/f4＜3.5；

where ZD is a distance between an object side surface of the first lens and an image side surface of the sixth lens along the optical axis, and f4 is a focal length of the fourth lens.

Optionally, the optical lens satisfies the following relation:

-0.85＜f/S9＜-0.61；

0.3＜f/S5＜0.52；

wherein f is the total focal length of the optical lens, S5 is the radius of curvature of the third lens object-side surface, and S9 is the radius of curvature of the fifth lens object-side surface.

Optionally, the optical lens satisfies the following relation:

0.3＜S2/S5＜0.54；

0.1＜S4/S7＜0.6；

0.05＜S6/S11＜0.18；

wherein S2 is a radius of curvature of the image side surface of the first lens element, S5 is a radius of curvature of the object side surface of the third lens element, S4 is a radius of curvature of the image side surface of the second lens element, S7 is a radius of curvature of the object side surface of the fourth lens element, S6 is a radius of curvature of the image side surface of the third lens element, and S11 is a radius of curvature of the object side surface of the sixth lens element.

Optionally, the optical lens satisfies the following relation:

0.18＜CT1/∑CT＜0.2；

0.16＜CT3/∑CT＜0.17；

0.09＜CT5/∑CT＜0.13；

wherein CT1 is the center thickness of the first lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, Σct is the sum of the center thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis, respectively.

Optionally, the optical lens satisfies the following relation:

0.3＜f/|S2|+f/|S11|＜0.5；

0.06＜f/|S6|+f/|S7|＜0.13；

wherein f is the total focal length of the optical lens assembly, S2 is the radius of curvature of the image-side surface of the first lens element, S11 is the radius of curvature of the object-side surface of the sixth lens element, S6 is the radius of curvature of the image-side surface of the first lens element, and S7 is the radius of curvature of the object-side surface of the sixth lens element.

Optionally, the optical lens satisfies the following relation:

3＜YD1172-YD6272＜4.5；

3＜YD1172-YD72-S＜4；

wherein YD1172 is the distance from the maximum effective radius position of the first lens object-side surface to the filter image-side surface, YD6272 is the distance from the maximum effective radius position of the sixth lens image-side surface to the filter image-side surface, and YD72-S is the distance from the filter to the photosurface of the optical lens.

Optionally, the optical lens satisfies the following relation:

4＜TTL＜5.1；

wherein TTL is the total system length of the optical lens;

the working wavelength of the optical lens is 0.4-0.9 um, the F number of the optical lens is 2.2, the angle of view of the optical lens is less than or equal to 160.2 degrees, and the axial distance from the object plane of the optical lens to the object side surface of the first lens is 490-510 mm.

Optionally, the materials of the first lens, the second lens and the third lens are glass or injection molding materials, the materials of the fourth lens, the fifth lens and the sixth lens are injection molding materials, and the materials of the optical filter are glass.

The invention also provides a VR device comprising an optical lens as set forth in any one of the preceding claims.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides an optical lens and VR equipment, which comprehensively improves the MTF value from the center view field to the edge of the lens by reasonably collocating the focal power and the surface shape of each lens, and has more excellent chromatic aberration and distortion correction performance, thereby obtaining better imaging quality.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of an optical headband light structure according to an embodiment of the present invention;

FIG. 3 is a 1/4 MTF diagram nyq of an optical lens according to an embodiment of the present invention;

fig. 4 is a 1/2nyq MTF diagram of an optical lens according to an embodiment of the present invention;

fig. 5 is a MTF diagram of a full nyq optical lens provided in an embodiment of the invention;

FIG. 6 is a defocus graph of an optical lens according to a first embodiment of the present invention;

fig. 7 is a relative illuminance diagram of an optical lens according to a first embodiment of the present invention;

FIG. 8 is a schematic view of SPT (spot diagram) of an optical lens according to an embodiment of the present invention;

fig. 9 is a lateral chromatic aberration diagram of an optical lens according to a first embodiment of the present invention;

fig. 10 is a longitudinal chromatic aberration diagram of an optical lens according to a first embodiment of the present invention;

FIG. 11 is a diagram showing curvature of field and distortion of an optical lens according to a first embodiment of the present invention;

fig. 12 is a diagram of lens data of an optical lens according to a first embodiment of the present invention;

fig. 13 is a distortion simulation diagram of an optical lens according to a first embodiment of the present invention;

fig. 14 is an imaging simulation diagram of an optical lens according to a first embodiment of the present invention;

fig. 15 is a schematic structural diagram of an optical lens according to a second embodiment of the present invention;

FIG. 16 is a schematic view of a light ray structure of an optical headband in accordance with a second embodiment of the present invention;

fig. 17 is a 1/4nyq MTF diagram of an optical lens according to a second embodiment of the present invention;

fig. 18 is a 1/2nyq MTF diagram of an optical lens according to a second embodiment of the present invention;

fig. 19 is a MTF diagram of a full nyq optical lens provided in a second embodiment of the present invention;

FIG. 20 is a defocus graph of an optical lens according to a second embodiment of the present invention;

FIG. 21 is a diagram of the relative illuminance of an optical lens according to a second embodiment of the present invention;

FIG. 22 is a schematic view of SPT (spot diagram) of an optical lens according to a second embodiment of the present invention;

fig. 23 is a lateral chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;

fig. 24 is a longitudinal chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;

FIG. 25 is a diagram showing curvature of field and distortion of an optical lens according to a second embodiment of the present invention;

fig. 26 is lens data of an optical lens according to a second embodiment of the present invention;

fig. 27 is a distortion simulation diagram of an optical lens according to a second embodiment of the present invention;

fig. 28 is an imaging simulation diagram of an optical lens according to a second embodiment of the present invention.

In the above figures:

e1, a first lens; e2, a second lens; e3, a third lens; e4, a fourth lens; e5, a fifth lens; e6, a sixth lens; e7, an optical filter; STO and diaphragm; s0, an object plane; s1, an object side surface of a first lens; s2, an image side surface of the first lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; s5, the object side surface of the third lens is provided; s6, an image side surface of the third lens; s7, an object side surface of the fourth lens; s8, an image side surface of the fourth lens is provided; s9, an object side surface of the fifth lens; s10, an image side surface of the fifth lens; s11, an object side surface of the sixth lens; s12, an image side surface of the sixth lens; s13, the object side surface of the optical filter; s14, an image side surface of the optical filter; s15, an imaging surface.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it will be understood that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Furthermore, the terms "long," "short," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description of the present invention, and are not intended to indicate or imply that the apparatus or elements referred to must have this particular orientation, operate in a particular orientation configuration, and thus should not be construed as limiting the invention.

The invention provides an optical lens, which is characterized in that a first lens, a second lens, a third lens, a fourth lens and a diaphragm are coaxially arranged in sequence from an object side to an image side, and an optical filter is arranged between the sixth lens and an imaging surface.

The first lens, the second lens and the third lens are made of glass or injection molding materials, the fourth lens, the fifth lens and the sixth lens are made of injection molding materials, and the filter is made of glass. Specifically, the optical lens adopts a 1G (Glass) +5P (Plastic) structure, namely, the optical lens is a Glass Plastic lens with one Glass lens and five Plastic lenses, and can adapt to more use requirements of target clients.

In this embodiment, the first lens element has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the object side surface of the second lens is a concave surface at a paraxial region, and the image side surface of the second lens is a concave surface at a paraxial region; the third lens element has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the object side surface of the fourth lens is a convex surface at a paraxial region, and the image side surface of the fourth lens is a concave surface at the paraxial region; the fifth lens element with a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the sixth lens element with a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the optical filter comprises an object side surface and an image side surface which are oppositely arranged and parallel to each other.

Further, the optical lens satisfies the following relation:

3 < ZD/f4 < 3.5, preferably 3.1502 < ZD/f4 < 3.4754;

0.18 < CT1/ΣCT < 0.2, preferably 0.1839 < CT1/ΣCT < 0.1924;

0.16 < CT3/ΣCT < 0.17, preferably 0.1601 < CT3/ΣCT < 0.1633;

0.09 < CT5/ΣCT < 0.13, preferably 0.0955 < CT5/ΣCT < 0.1244;

where ZD is a distance between an object side surface of the first lens element and an image side surface of the sixth lens element along the optical axis, and f4 is a focal length of the fourth lens element. CT1 is the center thickness of the first lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, Σct is the sum of the center thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis, respectively. The thickness and the axial distance of each lens are limited based on the relational expression, so that the miniaturization of the size of the lens is facilitated, and meanwhile, the assembly sensitivity of the lens can be reduced.

Further, the optical lens satisfies the following relation:

-0.85 < f/S9 < -0.61, preferably, -0.8443 < f/S9 < -0.6015;

0.3 < f/S5 < 0.52, preferably 0.3961 < f/S5 < 0.5147;

0.3 < S2/S5 < 0.54, preferably 0.3962 < S2/S5 < 0.5309;

0.1 < S4/S7 < 0.6, preferably 0.1659 < S4/S7 < 0.5928;

0.05 < S6/S11 < 0.18, preferably 0.0519 < S6/S11 < 0.1711;

0.3 < f/|S2|+f/|S11| < 0.5, preferably 0.3754 < f/|S2|+f/|S11| < 0.4513;

0.06 < f/|S6|+f/|S7| < 0.13, preferably 0.0673 < f/|S6|+f/|S7| < 0.1228;

wherein f is the total focal length of the optical lens, S5 is the radius of curvature of the third lens object-side surface, S9 is the radius of curvature of the fifth lens object-side surface, S2 is the radius of curvature of the first lens image-side surface, S4 is the radius of curvature of the second lens image-side surface, S7 is the radius of curvature of the fourth lens object-side surface, S6 is the radius of curvature of the third lens image-side surface, S11 is the radius of curvature of the sixth lens object-side surface, and f is the total focal length of the optical lens.

The surface shape of each lens is reasonably regulated based on the relation, which is beneficial to improving the MTF from the center view field to the edge.

Further, the optical lens satisfies the following relation:

3 < YD1172-YD6272 < 4.5, preferably 3.9875 < YD1172-YD6272 < 4.1583;

3 < YD1172-YD72-S < 4, preferably 3.8895 < YD1172-YD72-S < 3.9324;

where YD1172 is the distance from the maximum effective radius position of the first lens object-side surface to the filter image-side surface, YD6272 is the distance from the maximum effective radius position of the sixth lens image-side surface to the filter image-side surface, and YD72-S is the distance from the filter to the photosurface of the optical lens.

In addition, the total system length TTL of the optical lens satisfies the following relation: 4 < TTL < 5.1, preferably 4.985 < TTL < 5.004. Based on the relation, the imaging effect can be further optimized, and the miniaturization of the lens volume can be further realized.

Further, the working wavelength of the optical lens is 0.4-0.9 um, the F number of the optical lens is 2.2, the angle of view of the optical lens is less than or equal to 160.2 degrees, and the axial distance from the object plane of the optical lens to the object side surface of the first lens is 490-510 mm.

The structural parameters of the first lens to the optical filter are as follows:

the equivalent focal length of the first lens is-1.37 to-1.3 mm, the curvature radius of the object side surface of the first lens is-81 to-30 mm, the curvature radius of the image side surface of the first lens is 0.6 to 0.8mm, and the thickness of the central optical axis of the first lens is 0.4 to 0.5mm;

the equivalent focal length of the second lens is-12-29 mm, the curvature radius of the object side surface of the second lens is-1.9 to-1.4 mm, the curvature radius of the image side surface of the second lens is-2.8 to-1.5 mm, and the thickness of the central optical axis of the second lens is 0.5-0.65 mm;

the equivalent focal length of the third lens is 1.2-1.35 mm, the radius of curvature of the object side of the third lens is 1.3-1.8 mm, the radius of curvature of the image side of the third lens is-1.2 to-1 mm, and the thickness of the central optical axis of the third lens is 0.3-0.42 mm;

the equivalent focal length of the fourth lens is 1.2-1.33 mm, the curvature radius of the object side surface of the fourth lens is-9.3-4.6 mm, the curvature radius of the image side surface of the fourth lens is-0.63-0.8 mm, and the thickness of the central optical axis of the fourth lens is 0.3-0.42 mm;

the equivalent focal length of the fifth lens is-1 to-0.7 mm, the curvature radius of the object side surface of the fifth lens is-1.2 to-0.8 mm, the curvature radius of the image side surface of the fifth lens is 1.5 to 1.7mm, and the thickness of the central optical axis of the fifth lens is 0.2 to 0.35mm;

the equivalent focal length of the sixth lens is 2.4-2.6 mm, the radius of curvature of the object side surface of the sixth lens is-23 to-6 mm, the radius of curvature of the image side surface of the sixth lens is-1 to-1.3 mm, and the thickness of the central optical axis of the sixth lens is 0.35-0.42 mm;

the thickness of the optical filter is 0.1-0.2 mm.

The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.

Example 1

Referring to fig. 1 to 14 in combination, the present invention provides an optical lens assembly, in which a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6 and a filter E7 are coaxially arranged in order from an object side to an image side, and the filter E7 is disposed between the sixth lens element E6 and an image plane S15.

In this embodiment, the f# number of the optical lens system is set to 2.2, the maximum full field angle is set to 160.2 °, and the corresponding mic=1.08 mm, where MIC is the maximum imaging circle of the optical lens. Specifically, the working wavelength of the optical lens is 0.4-0.9 um, and may be specifically a value of 0.47um, 0.51um, 0.555um, 0.61um, 0.65um or 0.85 um.

In this embodiment, the distance between the geometric center of the optical axis where the object plane S0 of the optical lens is located and the geometric center of the optical axis of the object side S1 of the first lens element E1 is set to 500mm, i.e. the optimal detection distance of the optical lens element is set to 500mm.

The equivalent focal length f1 of the first lens E1 is-1.310 mm; the object side surface S1 is a concave surface, and the curvature radius is-80.780 mm; the image side S2 is a convex surface, and the curvature radius is +0.699mm; the distance CT1 from the geometric center of the object-side optical axis to the geometric center of the image-side optical axis is 0.447mm, i.e., the thickness of the first lens element E1 is 0.447mm. The first lens E1 is made of SZL-D4008 glass or injection molding material.

A second lens E2 with an equivalent focal length f2 of-11.609 mm; the object side surface S3 is a concave surface, and the curvature radius is-1.818 mm; the image side S4 is a concave surface, and the curvature radius is-2.714 mm; the distance CT2 between the geometric center of the object side optical axis and the geometric center of the image side optical axis is 0.624mm, namely the thickness of the second lens E2 is 0.624mm; the construction material is EP7000 injection molding material.

A third lens E3 with an equivalent focal length f3 of +1.313mm; the object side surface S5 is a convex surface, and the curvature radius is +1.765mm; the image side S6 is a concave surface, and the curvature radius is-1.112 mm; the distance CT3 between the geometric center of the object side optical axis and the geometric center of the image side optical axis is 0.389mm, namely the thickness of the third lens E3 is 0.389mm; the construction material is glass or APL5014 injection molding material.

A fourth lens E4 with an equivalent focal length f4 of +1.325mm; the object side surface S7 is a convex surface, and the curvature radius is +4.578mm; the image side S8 is a concave surface, and the curvature radius is-0.834 mm; the distance CT4 between the geometric center of the object side optical axis and the geometric center of the image side optical axis is 0.379mm, namely the thickness of the fourth lens E4 is 0.379mm; the construction material is APL5014 injection molding material.

A fifth lens E5 with an equivalent focal length f5 of-0.970 mm; the object side S9 is a concave surface, and the curvature radius is-1.162 mm; the image side S10 is a convex surface with a curvature radius of +1.568mm; the distance CT5 between the geometric center of the object side optical axis and the geometric center of the image side optical axis is 0.232mm, namely the thickness of the fifth lens E5 is 0.232mm; the construction material is EP8000 injection molding material.

A sixth lens E6 having an equivalent focal length f6 of +2.610mm; the object side surface S11 is a concave surface, and the curvature radius is-6.501 mm; the image side surface S12 is a concave surface, and the curvature radius is-1.191 mm; the distance CT6 between the geometric center of the object-side optical axis and the geometric center of the image-side optical axis is 0.359mm, i.e., the thickness of the sixth lens element E6 is 0.359mm; the construction material is APL5014 injection molding material.

The optical filter E7 comprises an object side surface S14 and an image side surface S14 which are oppositely arranged and parallel to each other, wherein the distance CT7 between the geometric center of the optical axis of the object side surface and the geometric center of the optical axis of the image side surface is 0.20mm, namely the thickness of the optical filter E7 is 0.20mm; the construction material is BK7 glass. The optical filter E7 is made of glass material, so that the influence on the focal length of the lens can be avoided.

In this embodiment, the distance DT1 between the geometric center of the image-side optical axis of the first lens element E1 and the geometric center of the object-side optical axis of the second lens element E2 is 0.874mm, i.e., the distance between the first lens element E1 and the second lens element E2 is 0.874mm.

The distance DT2 between the geometric center of the image-side optical axis of the second lens element E2 and the geometric center of the object-side optical axis of the third lens element E3 is 0.365mm, i.e., the distance between the second lens element E2 and the third lens element E3 is 0.365mm.

The distance DT3 between the geometric center of the image-side optical axis of the third lens element E3 and the geometric center of the object-side optical axis of the fourth lens element E4 is 0.365mm, i.e., the distance between the third lens element E3 and the fourth lens element E4 is 0.365mm.

The distance DT4 between the geometric center of the image-side optical axis of the fourth lens element E4 and the geometric center of the object-side optical axis of the fifth lens element E5 is 0.053mm, i.e., the distance between the fourth lens element E4 and the fifth lens element E5 is 0.053mm.

The distance DT5 between the geometric center of the image-side optical axis of the fifth lens element E5 and the geometric center of the object-side optical axis of the sixth lens element E6 is 0.072mm, i.e., the distance between the fifth lens element E5 and the sixth lens element E6 is 0.072mm.

The distance DT6 between the geometric center of the image side optical axis of the sixth lens element E6 and the geometric center of the object side optical axis of the optical filter E7 is 0.100mm, i.e., the distance between the fifth lens element E5 and the optical filter E7 is 0.1mm.

Further, the total optical system length TTL of the optical lens is 5.004mm.

Example two

Referring to fig. 15 to 28 in combination, the present invention provides an optical lens assembly, in which a first lens element E1, a second lens element E2, a third lens element E3, a stop STO, a fourth lens element E4, a fifth lens element E5, a sixth lens element E6 and a filter E7 are coaxially arranged in order from an object side to an image side, and the filter E7 is disposed between the sixth lens element E6 and the image plane S15.

In this embodiment, the distance between the geometric center of the optical axis where the object plane S0 of the optical lens is located and the geometric center of the optical axis of the object side surface of the first lens element E1 is set to 500mm, i.e. the optimal detection distance of the optical lens is set to 500mm.

The equivalent focal length f1 of the first lens E1 is-1.365 mm; the object side surface S1 is a concave surface, and the curvature radius is-39.519 mm; the image side S2 is a convex surface, and the curvature radius is +0.721mm; the distance CT1 between the geometric center of the object side optical axis and the geometric center of the image side optical axis is 0.498mm, namely the thickness of the first lens E1 is 0.498mm; the construction material is glass or ARTON-D4531F injection molding material.

A second lens E2 with an equivalent focal length f2 of +28.194mm; the object side surface S3 is a concave surface, and the curvature radius is-1.442 mm; the image side S4 is a concave surface, and the curvature radius is-1.530 mm; the distance CT2 between the geometric center of the object side optical axis and the geometric center of the image side optical axis is 0.526mm, namely the thickness of the second lens E2 is 0.526mm; the construction material is EP7000 injection molding material.

A third lens E3 with an equivalent focal length f3 of +1.241mm; the object side surface S5 is a convex surface, and the curvature radius is +1.358mm; the image side S6 is a concave surface, and the curvature radius is-1.170 mm; the distance CT3 between the geometric center of the object side optical axis and the geometric center of the image side optical axis is 0.415mm, namely the thickness of the third lens E3 is 0.415mm; the construction material is SZL-D4001 glass or injection molding material.

A fourth lens E4 with an equivalent focal length f4 of +1.201mm; the object side surface S7 is a convex surface, and the curvature radius is-9.220 mm; the image side S8 is a concave surface, and the curvature radius is-0.622 mm; the distance CT4 from the geometric center of the object side optical axis to the geometric center of the image side optical axis is 0.417mm, namely the thickness of the fourth lens E4 is 0.417mm; the construction material is APL5014 injection molding material.

A fifth lens E5 with an equivalent focal length f5 of-0.793 mm; the object side S9 is a concave surface, and the curvature radius is-0.828 mm; the image side S10 is a convex surface, and the curvature radius is +1.684mm; the distance CT5 from the geometric center of the object-side optical axis to the geometric center of the image-side optical axis is 0.322mm, namely the thickness of the fifth lens E5 is 0.322mm; the construction material is EP8000 injection molding material.

A sixth lens E6 with an equivalent focal length f6 of +2.498mm; the object side surface S11 is a concave surface, and the curvature radius is-22.501 mm; the image side surface S12 is a concave surface, and the curvature radius is-1.294 mm; the distance CT6 from the geometric center of the object side optical axis to the geometric center of the image side optical axis is 0.411mm, namely the thickness of the sixth lens E6 is 0.411mm; the construction material is APL5014 injection molding material.

The optical filter E7 comprises an object side surface S14 and an image side surface S14 which are oppositely arranged and parallel to each other, wherein the distance CT7 between the geometric center of the optical axis of the object side surface and the geometric center of the optical axis of the image side surface is 0.165mm, namely the thickness of the optical filter E7 is 0.165mm; the construction material is BK7 glass. The use of glass for the filter E7 can avoid affecting the focal length.

Further, the distance DT1 between the geometric center of the image-side optical axis of the first lens element E1 and the geometric center of the object-side optical axis of the second lens element E2 is 0.993mm, i.e., the distance between the first lens element E1 and the second lens element E2 is 0.993mm.

The distance DT2 between the geometric center of the image-side optical axis of the second lens element E2 and the geometric center of the object-side optical axis of the third lens element E3 is 0.430mm, i.e., the distance between the second lens element E2 and the third lens element E3 is 0.430mm.

The distance DT3 between the geometric center of the image-side optical axis of the third lens element E3 and the geometric center of the object-side optical axis of the fourth lens element E4 is 0.357mm, i.e., the distance between the third lens element E3 and the fourth lens element E4 is 0.357mm.

The distance DT4 between the geometric center of the image-side optical axis of the fourth lens element E4 and the geometric center of the object-side optical axis of the fifth lens element E5 is 0.047mm, i.e., the distance between the fourth lens element E4 and the fifth lens element E5 is 0.047mm.

The distance DT5 between the geometric center of the image-side optical axis of the fifth lens element E5 and the geometric center of the object-side optical axis of the sixth lens element E6 is 0.058mm, i.e., the distance between the fifth lens element E5 and the sixth lens element E6 is 0.058mm.

The distance DT6 between the geometric center of the image-side optical axis of the sixth lens element E6 and the geometric center of the object-side optical axis of the optical filter E7 is 0.100mm, i.e., the distance between the fifth lens element E5 and the optical filter E7 is 0.1mm.

Further, the total optical system length TTL of the optical lens is 5.001mm.

Example III

Based on the foregoing embodiments, the present invention further provides a VR device including the optical lens in any one of the foregoing embodiments.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical lens is characterized in that a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and an optical filter are coaxially arranged in sequence from an object side to an image side; the optical lens comprises six lenses with refractive power;

the equivalent focal length f1 of the first lens is-1.310 mm, the curvature radius of the object side surface S1 of the first lens is-80.780 mm, and the curvature radius of the image side surface S2 of the first lens is +0.699mm; the thickness of the first lens is 0.447mm;

the equivalent focal length f2 of the second lens is-11.609 mm, the curvature radius of the object side surface S3 of the second lens is-1.818 mm, and the curvature radius of the image side surface S4 of the second lens is-2.714 mm; the thickness of the second lens is 0.624mm;

the equivalent focal length f3 of the third lens is +1.313mm, the curvature radius of the object side surface S5 of the third lens is +1.765mm, and the curvature radius of the image side surface S6 of the third lens is-1.112 mm; the thickness of the third lens is 0.389mm;

the equivalent focal length f4 of the fourth lens is +1.325mm, the curvature radius of the object side surface S7 of the fourth lens is +4.578mm, and the curvature radius of the image side surface S8 of the fourth lens is-0.834 mm; the thickness of the fourth lens is 0.379mm;

the equivalent focal length f5 of the fifth lens is-0.970 mm, the curvature radius of the object side surface S9 of the fifth lens is-1.162 mm, and the curvature radius of the image side surface S10 of the fifth lens is +1.568mm; the thickness of the fifth lens is 0.232mm;

the equivalent focal length f6 of the sixth lens is +2.610mm, the curvature radius of the object side surface S11 of the sixth lens is-6.501 mm, and the curvature radius of the image side surface S12 of the sixth lens is-1.191 mm; the thickness of the sixth lens is 0.359mm.

2. The optical lens of claim 1, wherein,

the distance between the first lens and the second lens is 0.874mm;

the distance between the second lens and the third lens is 0.365mm;

the distance between the third lens and the fourth lens is 0.365mm;

the distance between the fourth lens and the fifth lens is 0.053mm;

the distance between the fifth lens and the sixth lens is 0.072mm.

3. The optical lens as claimed in claim 1, wherein the total system length of the optical lens is 5.004mm, the working wavelength of the optical lens is 0.4-0.9 um, the F-number of the optical lens is 2.2, the angle of view of the optical lens is 160.2 °, and the axial distance from the object plane of the optical lens to the first lens object side surface S1 is 500mm.

4. An optical lens is characterized in that a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and an optical filter are coaxially arranged in sequence from an object side to an image side; the optical lens comprises six lenses with refractive power;

the equivalent focal length f1 of the first lens is-1.365 mm, the curvature radius of the object side surface S1 is-39.519 mm, the curvature radius of the image side surface S2 is +0.721mm, and the thickness of the first lens is 0.498mm;

the equivalent focal length f2 of the second lens is +28.194mm, the curvature radius of the object side S3 is-1.442 mm, the curvature radius of the image side S4 is-1.530 mm, and the thickness of the second lens is 0.526mm;

the equivalent focal length f3 of the third lens is +1.241mm, the curvature radius of the object side surface S5 is +1.358mm, the curvature radius of the image side surface S6 is-1.170 mm, and the thickness of the third lens is 0.415mm;

the equivalent focal length f4 of the fourth lens is +1.201mm, the curvature radius of the object side surface S7 is-9.220 mm, the curvature radius of the image side surface S8 is-0.622 mm, and the thickness of the fourth lens is 0.417mm;

the equivalent focal length f5 of the fifth lens is-0.793 mm, the curvature radius of the object side surface S9 of the fifth lens is-0.828 mm, the curvature radius of the image side surface S10 of the fifth lens is +1.684mm, and the thickness of the fifth lens is 0.322mm;

the equivalent focal length f6 of the sixth lens is +2.498mm, the curvature radius of the object side S11 is-22.501 mm, the curvature radius of the image side S12 is-1.294 mm, and the thickness of the sixth lens is 0.411mm.

5. The optical lens of claim 4, wherein,

the distance between the first lens and the second lens is 0.993mm;

the distance between the second lens and the third lens is 0.430mm;

the distance between the third lens and the fourth lens is 0.357mm;

the distance between the fourth lens and the fifth lens is 0.047mm;

the distance between the fifth lens and the sixth lens is 0.058mm.

6. The optical lens as claimed in claim 4, wherein the total system length of the optical lens is 5.001m, the working wavelength of the optical lens is 0.4-0.9 um, the F-number of the optical lens is 2.2, the angle of view of the optical lens is 160.2 °, and the axial distance from the object plane of the optical lens to the first lens object side surface S1 is 500mm.

7. A VR device comprising an optical lens as claimed in any one of claims 1 to 6.