CN114460724A - Short-distance wide-angle high-definition imaging lens - Google Patents

Short-distance wide-angle high-definition imaging lens Download PDF

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CN114460724A
CN114460724A CN202111659638.2A CN202111659638A CN114460724A CN 114460724 A CN114460724 A CN 114460724A CN 202111659638 A CN202111659638 A CN 202111659638A CN 114460724 A CN114460724 A CN 114460724A
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optical system
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CN114460724B (en
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许熠宸
罗杰
林文斌
薛政云
胡青平
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Fujian Forecam Tiantong Optics Co Ltd
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Fujian Forecam Tiantong Optics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

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Abstract

The invention relates to a near-distance wide-angle high-definition imaging lens which comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from left to right along a light incident light path, wherein the first lens to the sixth lens are all made of plastic materials. The lens adopts an all-plastic structure, and a plurality of aspheric surfaces are utilized, so that the imaging quality is improved, and meanwhile, the production cost and the system total weight are reduced. The F number is smaller, the clear aperture is larger, and the display can be more prominent in a dark environment; the material collocation and the lens optical power distribution are reasonable, the main aberration and chromatic aberration correction are good, the surface design is reasonable, the light incident angle of each mirror surface is small, the overall imaging quality of the system is excellent, and the tolerance sensitivity is low; can stably work within the temperature range of-40 ℃ to 105 ℃, and has complex environmental adaptability.

Description

Short-distance wide-angle high-definition imaging lens
Technical Field
The invention relates to a short-distance wide-angle high-definition imaging lens.
Background
Face recognition is applied more frequently in public service scenes, but the phenomena of low face brushing speed, low accuracy, failed recognition and the like are still quite common, and unnecessary troubles and puzzles are often caused to people or related workers. Therefore, there is a need for a lens with high image quality, high light flux and small size to enhance the accuracy of facial feature recognition and simplify the related algorithms, thereby improving the security efficiency.
Disclosure of Invention
The invention aims to provide a short-distance wide-angle high-definition imaging lens which adopts an all-plastic structure, and reduces the production cost and the total weight of a system while improving the imaging quality by using a plurality of aspheric surfaces.
The technical scheme of the invention is as follows: a short-distance wide-angle high-definition imaging lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along a light incident light path from left to right; under the condition of not considering the reverse curvature caused by aspheric coefficients, the first lens is a negative meniscus lens, the second lens is a double convex positive lens, the third lens is a negative meniscus lens, the fourth lens is a positive meniscus lens, the sixth lens is a negative meniscus lens, and the first lens to the sixth lens are all made of plastic materials.
Furthermore, the focal length of the optical system of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f1、f2、f3、f4，f5、f6Wherein f is1、f2、f3、 f4、f6And f satisfy the following ratio: -2.0<f1/f<-0.1，0.1<f2/f<2.5，-3.0<f3/f<-0.5， 0.5<f4/f<2.5，-4.5<f6/f<-0.5。
Further, the first lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; the second lens satisfies the relation: n is a radical of hydrogend≥1.5，VdNot less than 50.0; the third lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the fourth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the sixth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; wherein N isdIs refractive index, VdAbbe constant.
Further, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric lenses.
Further, the total optical length TTL of the optical system of the lens and the focal length f of the optical system satisfy: TTL/f is less than or equal to 4.1.
Further, the F number of the optical system of the lens is less than or equal to 2.44.
Compared with the prior art, the invention has the following advantages: the lens adopts a full-plastic structure, and a plurality of aspheric surfaces are adopted, so that the imaging quality is improved, and meanwhile, the production cost and the total weight of a system are reduced; the F number is smaller, the clear aperture is larger, and the display can be more prominent in a dark environment; the material collocation and the lens optical power distribution are reasonable, the main aberration and chromatic aberration correction are good, the surface design is reasonable, the light incident angle of each mirror surface is small, the overall imaging quality of the system is excellent, and the tolerance sensitivity is low; can stably work within the temperature range of-40 ℃ to 105 ℃, and has complex environmental adaptability.
Drawings
FIG. 1 is a schematic diagram of an optical structure according to a first embodiment of the present invention;
FIG. 2 is a full operating band axial chromatic aberration diagram according to a first embodiment of the present invention;
FIG. 3 is a vertical axis chromatic aberration diagram of the full operating band according to the first embodiment of the present invention;
FIG. 4 is a full operating band field curvature distortion diagram according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of an optical structure according to a second embodiment of the present invention;
FIG. 6 is a full operating band axial chromatic aberration diagram of a second embodiment of the present invention;
FIG. 7 is a full operating band vertical axis chromatic aberration diagram of a second embodiment of the present invention;
FIG. 8 is a full operating band field curvature distortion diagram according to the second embodiment of the present invention;
FIG. 9 is a schematic diagram of an optical structure according to a third embodiment of the present invention;
FIG. 10 is a full operating band axial chromatic aberration diagram of a third embodiment of the present invention;
FIG. 11 is a vertical axis chromatic aberration diagram of a full operating band in accordance with a third embodiment of the present invention;
FIG. 12 is a full operating band field curvature distortion diagram according to a third embodiment of the present invention;
FIG. 13 is a schematic diagram of an optical structure according to a fourth embodiment of the present invention;
FIG. 14 is a full operating band axial chromatic aberration diagram of a fourth embodiment of the present invention;
FIG. 15 is a vertical axis chromatic aberration diagram of a full operating band of a fourth embodiment of the present invention;
FIG. 16 is a full operating band field curvature distortion diagram according to a fourth embodiment of the present invention;
in the figure: l1-first lens; STO-stop; l2-second lens; l3-third lens; l4-fourth lens; l5-fifth lens; l6-sixth lens; l7-equivalent glass plate; IMA-imaging plane.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Embodiment one refer to fig. 1 to 4
A short-distance wide-angle high-definition imaging lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along a light incident light path from left to right; under the condition of not considering the reverse curvature caused by aspheric coefficients, the first lens is a negative meniscus lens, the second lens is a double convex positive lens, the third lens is a negative meniscus lens, the fourth lens is a positive meniscus lens, the sixth lens is a negative meniscus lens, and the first lens to the sixth lens are all made of plastic materials.
In this embodiment, the focal length of the optical system of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f1、f2、f3、f4，f5、f6Wherein f is1、f2、f3、 f4、f6And f satisfy the following ratio: -2.0<f1/f<-0.1，0.1<f2/f<2.5，-3.0<f3/f<-0.5，0.5<f4/f<2.5，-4.5<f6/f<-0.5。
In this embodiment, the first lens satisfies the following relation: n is a radical ofd≥1.5，VdNot less than 50.0; the second lens satisfies the relation: n is a radical of hydrogend≥1.5，VdNot less than 50.0; the third lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the fourth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the sixth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; wherein N isdIs refractive index, VdAbbe constant.
In this embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric lenses. The aspheric surface curve equation expression is:
Figure BDA0003449371040000041
wherein Z is the distance from the aspheric surface to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha is alpha1、α2、α3、α4、α5、α6、α7、α8Are all high-order term coefficients.
In this embodiment, the total optical length TTL of the optical system of the lens and the focal length f of the optical system satisfy: TTL/f is less than or equal to 4.1.
In this embodiment, the technical indexes realized by the optical system are as follows:
(1) focal length: EFFL is more than or equal to 1.21 and less than or equal to 2.01 mm;
(2) the aperture F is less than or equal to 2.41;
(3) the field angle: 2w is more than or equal to 120 degrees.
In order to realize the above design parameters, the specific design adopted by the optical system of this embodiment is as follows:
Figure BDA0003449371040000051
in this embodiment, the aspherical coefficients of the aspherical lenses of the optical system are as follows:
Figure BDA0003449371040000052
in the embodiment, the optical system realizes wide-angle, large-aperture, small-size and low-temperature floating design, and simultaneously performs good correction on-axis and off-axis aberrations.
Embodiment II referring to FIGS. 5 to 8
A short-distance wide-angle high-definition imaging lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along a light incident light path from left to right; under the condition of not considering the reverse curvature caused by aspheric coefficients, the first lens is a negative meniscus lens, the second lens is a double convex positive lens, the third lens is a negative meniscus lens, the fourth lens is a positive meniscus lens, the sixth lens is a negative meniscus lens, and the first lens to the sixth lens are all made of plastic materials.
In this embodiment, the focal length of the optical system of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f1、f2、f3、f4，f5、f6Wherein f is1、f2、f3、 f4、f6And f satisfy the following ratio: -2.0<f1/f<-0.1，0.1<f2/f<2.5，-3.0<f3/f<-0.5， 0.5<f4/f<2.5，-4.5<f6/f<-0.5。
In this embodiment, the first lens satisfies the following relation: n is a radical ofd≥1.5，VdNot less than 50.0; the second lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; the third lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the fourth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the sixth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; wherein N isdIs a refractive index, VdAbbe constant.
In this embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric lenses. The aspheric surface curve equation expression is:
Figure BDA0003449371040000061
wherein Z is the distance from the aspheric surface to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha is alpha1、α2、α3、α4、α5、α6、α7、α8Are all high-order term coefficients.
In this embodiment, the total optical length TTL of the optical system of the lens and the focal length f of the optical system satisfy: TTL/f is less than or equal to 4.1.
In this embodiment, the technical indexes realized by the optical system are as follows:
(1) focal length: EFFL is more than or equal to 1.43 and less than or equal to 2.11 mm;
(2) the aperture F is less than or equal to 2.43;
(3) the field angle: 2w is more than or equal to 120 degrees.
To realize the above design parameters, the specific design adopted by the optical system of this embodiment is as follows:
Figure BDA0003449371040000071
in this embodiment, the aspherical coefficients of the aspherical lenses of the optical system are as follows:
Figure BDA0003449371040000081
in the embodiment, the optical system realizes wide-angle, large-aperture, small-size and low-temperature floating design, and simultaneously performs good correction on-axis and off-axis aberrations.
Embodiment III reference is made to FIGS. 9 to 12
A short-distance wide-angle high-definition imaging lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along a light incident light path from left to right; under the condition of not considering the reverse curvature caused by aspheric coefficients, the first lens is a negative meniscus lens, the second lens is a double convex positive lens, the third lens is a negative meniscus lens, the fourth lens is a positive meniscus lens, the sixth lens is a negative meniscus lens, and the first lens to the sixth lens are all made of plastic materials.
In this embodiment, the focal length of the optical system of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f1、f2、f3、f4，f5、f6Wherein f is1、f2、f3、 f4、f6And f satisfy the following ratio: -2.0<f1/f<-0.1，0.1<f2/f<2.5，-3.0<f3/f<-0.5， 0.5<f4/f<2.5，-4.5<f6/f<-0.5。
In this embodiment, the first lens satisfies the following relation: n is a radical ofd≥1.5，VdNot less than 50.0; the second lens satisfies the relation: n is a radical of hydrogend≥1.5，VdNot less than 50.0; the third lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the fourth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the sixth lens satisfies the relation: n is a radical of hydrogend≥1.5，VdNot less than 50.0; wherein N isdIs refractive index, VdIs AbbeA constant.
In this embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric lenses. The aspheric surface curve equation expression is:
Figure BDA0003449371040000091
wherein Z is the distance from the aspheric surface to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha is alpha1、α2、α3、α4、α5、α6、α7、α8Are all high-order term coefficients.
In this embodiment, the total optical length TTL of the optical system of the lens and the focal length f of the optical system satisfy: TTL/f is less than or equal to 4.1.
In this embodiment, the technical indexes realized by the optical system are as follows:
(1) focal length: EFFL is more than or equal to 1.60 and less than or equal to 2.11 mm;
(2) the aperture F is less than or equal to 2.44;
(3) the field angle: 2w is more than or equal to 120 degrees.
To realize the above design parameters, the specific design adopted by the optical system of this embodiment is as follows:
Figure BDA0003449371040000101
in this embodiment, the aspherical coefficients of the aspherical lenses of the optical system are as follows:
Figure BDA0003449371040000102
in the embodiment, the optical system realizes wide-angle, large-aperture, small-size and low-temperature floating design, and simultaneously performs good correction on-axis and off-axis aberrations.
Example IV referring to FIGS. 13 to 16
A short-distance wide-angle high-definition imaging lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged along a light incident light path from left to right; under the condition of not considering the reverse curvature caused by aspheric coefficients, the first lens is a negative meniscus lens, the second lens is a double convex positive lens, the third lens is a negative meniscus lens, the fourth lens is a positive meniscus lens, the sixth lens is a negative meniscus lens, and the first lens to the sixth lens are all made of plastic materials.
In this embodiment, the focal length of the optical system of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively f1、f2、f3、f4，f5、f6Wherein f is1、f2、f3、 f4、f6And f satisfy the following ratio: -2.0<f1/f<-0.1，0.1<f2/f<2.5，-3.0<f3/f<-0.5， 0.5<f4/f<2.5，-4.5<f6/f<-0.5。
In this embodiment, the first lens satisfies the following relation: n is a radical ofd≥1.5，VdNot less than 50.0; the second lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; the third lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the fourth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdLess than or equal to 50.0; the sixth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 50.0; wherein N isdIs refractive index, VdAbbe constant.
In this embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric lenses. The aspheric surface curve equation expression is:
Figure BDA0003449371040000111
wherein Z is the distance from the aspheric surface to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is a conic constant; alpha (alpha) ("alpha")1、α2、α3、α4、α5、α6、α7、α8Are all high-order term coefficients.
In this embodiment, the total optical length TTL of the optical system of the lens and the focal length f of the optical system satisfy: TTL/f is less than or equal to 4.1.
In this embodiment, the technical indexes realized by the optical system are as follows:
(1) focal length: EFFL is more than or equal to 1.54 and less than or equal to 2.09 mm;
(2) the aperture F is less than or equal to 2.43;
(3) the field angle: 2w is more than or equal to 120 degrees.
To realize the above design parameters, the specific design adopted by the optical system of this embodiment is as follows:
Figure BDA0003449371040000121
in this embodiment, the aspherical coefficients of the aspherical lenses of the optical system are as follows:
Figure BDA0003449371040000131
in the embodiment, the optical system realizes wide-angle, large-aperture, small-size and low-temperature floating design, and simultaneously performs good correction on-axis and off-axis aberrations.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (6)

1. A short-distance wide-angle high-definition imaging lens is characterized by comprising a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from left to right along a light incident light path; under the condition of not considering the reverse curvature caused by the aspheric surface coefficient, the first lens is a negative meniscus lens, the second lens is a double convex positive lens, the third lens is a negative meniscus lens, the fourth lens is a positive meniscus lens, and the sixth lens is a negative meniscus lens; the first lens, the second lens and the third lens are made of plastic materials.
2. The close-up wide-angle high-definition imaging lens as claimed in claim 1, wherein the focal length of the optical system of the lens is
Figure DEST_PATH_IMAGE001
The focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively
Figure 560114DEST_PATH_IMAGE002
、
Figure DEST_PATH_IMAGE003
、
Figure 360579DEST_PATH_IMAGE004
、
Figure DEST_PATH_IMAGE005
，
Figure 801925DEST_PATH_IMAGE006
、
Figure DEST_PATH_IMAGE007
Wherein
Figure 930418DEST_PATH_IMAGE002
、
Figure 524035DEST_PATH_IMAGE003
、
Figure 54373DEST_PATH_IMAGE004
、
Figure 73145DEST_PATH_IMAGE005
、
Figure 79147DEST_PATH_IMAGE007
And
Figure 841566DEST_PATH_IMAGE001
the following proportions are satisfied: -2.0<
Figure 616624DEST_PATH_IMAGE002
/
Figure 540718DEST_PATH_IMAGE001
<-0.1，0.1<
Figure 909382DEST_PATH_IMAGE003
/
Figure 334548DEST_PATH_IMAGE001
<2.5，-3.0<
Figure 105057DEST_PATH_IMAGE004
/
Figure 200052DEST_PATH_IMAGE001
<-0.5，0.5<
Figure 682112DEST_PATH_IMAGE005
/
Figure 786334DEST_PATH_IMAGE001
<2.5，-4.5<
Figure 270405DEST_PATH_IMAGE007
/
Figure 801880DEST_PATH_IMAGE008
<-0.5。
3. The close-up wide-angle high-definition imaging lens as claimed in claim 1, wherein the first lens satisfies the relation:
Figure DEST_PATH_IMAGE009
≥1.5，
Figure 473033DEST_PATH_IMAGE010
not less than 50.0; the second lens satisfies the relation:
Figure 380946DEST_PATH_IMAGE009
≥1.5，
Figure 985103DEST_PATH_IMAGE010
not less than 50.0; the third lens satisfies the relation:
Figure 687480DEST_PATH_IMAGE009
≥1.5，
Figure 518032DEST_PATH_IMAGE010
less than or equal to 50.0; the fourth lens satisfies the relation:
Figure 321647DEST_PATH_IMAGE009
≥1.5，
Figure 921256DEST_PATH_IMAGE010
not less than 50.0; the fifth lens satisfies the relation:
Figure 528954DEST_PATH_IMAGE009
≥1.5，
Figure 971437DEST_PATH_IMAGE010
less than or equal to 50.0; the sixth lens satisfies the relation:
Figure 689994DEST_PATH_IMAGE009
≥1.5，
Figure 409689DEST_PATH_IMAGE010
not less than 50.0; wherein
Figure 312923DEST_PATH_IMAGE009
In order to be the refractive index,
Figure 118068DEST_PATH_IMAGE010
abbe constant.
4. The close-range wide-angle high-definition imaging lens as claimed in claim 1, 2 or 3, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are aspheric lenses.
5. The close-up wide-angle high-definition imaging lens of claim 1, wherein the total optical length TTL of the optical system of the lens and the focal length f of the optical system satisfy the following relation: TTL/f is less than or equal to 4.1.
6. The close-up wide-angle high-definition imaging lens as claimed in claim 1, wherein the F number of the optical system of the lens is less than or equal to 2.44.
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