CN111830671B - Wide-angle lens - Google Patents

Wide-angle lens Download PDF

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Publication number
CN111830671B
CN111830671B CN201910312256.9A CN201910312256A CN111830671B CN 111830671 B CN111830671 B CN 111830671B CN 201910312256 A CN201910312256 A CN 201910312256A CN 111830671 B CN111830671 B CN 111830671B
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lens
surface facing
lens element
refractive power
wide
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CN111830671A (en
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陈文杰
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Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
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Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
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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
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Abstract

A wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens. The first lens has a negative refractive power. The second lens has a negative refractive power. The third lens element has negative refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power and comprises a convex surface facing the object side. The fifth lens has positive refractive power and comprises a convex surface facing the object side. The sixth lens element has positive refractive power and includes a convex surface facing the object side. The seventh lens element has refractive power and includes a concave surface facing the image side. The eighth lens has refractive power. The ninth lens has refractive power. The tenth lens is a meniscus lens having refractive power.

Description

Wide-angle lens
Technical Field
The invention relates to a wide-angle lens.
Background
In recent years, a large number of monitors shared day and night are used in a home environment to improve home security, and most of the monitors are equipped with wide-angle lenses to capture visible light images in the daytime and to capture infrared light images at night. Because the visible light and the infrared light have different wave bands, when the visible light and the infrared light pass through the known wide-angle lens, the Back Focal Length (Back Focal Length) of the wide-angle lens usually has a difference of more than 0.01mm, and when the relative position between the lens and the image sensor is fixed, the difference of more than 0.01mm causes rapid degradation of an image of one wave band, so that the known wide-angle lens cannot provide a clear visible light image and an infrared light image at the same time. Therefore, another wide-angle lens with a new structure is needed to provide clear visible light images and infrared light images simultaneously to meet the current demands.
Disclosure of Invention
The present invention is directed to provide a wide-angle lens, which can provide both visible light images and infrared light images with good optical performance, aiming at the defect that the wide-angle lens in the prior art cannot provide clear visible light images and infrared light images at the same time.
The present invention provides a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens. The first lens has a negative refractive power. The second lens has a negative refractive power. The third lens element has negative refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power and comprises a convex surface facing the object side. The fifth lens has positive refractive power and comprises a convex surface facing the object side. The sixth lens element has positive refractive power and includes a convex surface facing the object side. The seventh lens element has refractive power and includes a concave surface facing the image side. The eighth lens has refractive power. The ninth lens has refractive power. The tenth lens is a meniscus lens having refractive power. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element, the ninth lens element and the tenth lens element are sequentially disposed along an optical axis from an object side to an image side.
The fifth lens element includes a convex surface facing the image side, the sixth lens element includes a convex surface facing the image side, the seventh lens element has negative refractive power and further includes a concave surface facing the object side, the eighth lens element has positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side, the ninth lens element has positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side, and the tenth lens element has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side.
The wide-angle lens of the invention may further include an eleventh lens disposed between the sixth lens and the seventh lens, the sixth lens element can further comprise a concave surface facing the image side, the seventh lens element has negative refractive power and can further comprise a concave surface facing the object side, the eighth lens element has positive refractive power and comprises a convex surface facing the object side and another convex surface facing the image side, the ninth lens element has positive refractive power and comprises a convex surface facing the object side and another convex surface facing the image side, the tenth lens element has positive refractive power and comprises a concave surface facing the object side and a convex surface facing the image side, and the eleventh lens element has positive refractive power and comprises a convex surface facing the object side and another convex surface facing the image side.
Wherein the eleventh lens, the seventh lens and the eighth lens are cemented.
Wherein the sixth lens and the seventh lens are cemented.
The wide-angle lens meets the following conditions: r is more than or equal to 2.711R12Less than or equal to 3.7; wherein R is11Is the radius of curvature, R, of the object-side surface of the first lens12Is the radius of curvature of the image-side surface of the first lens.
The wide-angle lens meets the following conditions: 1.6. ltoreq.D12R12< 1.81; wherein D is12Is the optical effective diameter, R, of the image side surface of the first lens12Is the radius of curvature of the image-side surface of the first lens.
The wide-angle lens meets the following conditions: 64mm2≤R31×R32≤108mm2(ii) a Wherein R is31Is the radius of curvature, R, of the object-side surface of the third lens32Is the radius of curvature of the image-side surface of the third lens.
The wide-angle lens meets the following conditions: nd of not less than 1.85Less than or equal to 2.1; wherein, Nd5Is the refractive index of the fifth lens.
The wide-angle lens meets the following conditions: vd is more than or equal to 656+Vd7Less than or equal to 94; wherein, Vd6Abbe number of the sixth lens, Vd7Abbe number of the seventh lens.
The wide-angle lens meets the following conditions: -0.95. ltoreq.R72-R81Less than or equal to 0.40; wherein R is72Is the radius of curvature, R, of the image-side surface of the seventh lens element81Is the radius of curvature of the object-side surface of the eighth lens.
The wide-angle lens has the following beneficial effects: by the special combination mode of the plastic and the glass material, the back focal length difference of visible light and infrared light can be greatly reduced, so that the visible light image and the infrared light image both have good optical performance.
Drawings
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Fig. 1 is a lens arrangement diagram of a first embodiment of a wide-angle lens according to the present invention.
Fig. 2A, 2B, 2C, 2D, 2E, 2F, 2G, and 2H are a Longitudinal Aberration (Longitudinal Aberration) diagram in the visible region, a Field Curvature (Field Curvature) diagram in the visible region, a Distortion (Distortion) diagram in the visible region, a transverse chromatic Aberration (Lateral Color) diagram in the visible region, a Longitudinal Aberration diagram in the infrared region, a Field Curvature diagram in the infrared region, a Distortion diagram in the infrared region, and a transverse chromatic Aberration diagram in the infrared region, respectively, according to the first embodiment of the wide-angle lens of the present invention.
Fig. 3 is a lens arrangement diagram of a second embodiment of a wide-angle lens according to the present invention.
Fig. 4A, 4B, 4C, 4D, 4E, 4F, 4G, and 4H are a longitudinal aberration diagram in the visible region, a field curvature diagram in the visible region, a distortion diagram in the visible region, a lateral aberration diagram in the visible region, a longitudinal aberration diagram in the infrared region, a field curvature diagram in the infrared region, a distortion diagram in the infrared region, and a lateral aberration diagram in the infrared region, respectively, according to the second embodiment of the wide-angle lens of the present invention.
Fig. 5 is a lens arrangement diagram of a third embodiment of a wide-angle lens according to the present invention.
Fig. 6A, 6B, 6C, 6D, 6E, 6F, 6G, and 6H are a longitudinal aberration diagram in the visible region, a field curvature diagram in the visible region, a distortion diagram in the visible region, a lateral aberration diagram in the visible region, a longitudinal aberration diagram in the infrared region, a field curvature diagram in the infrared region, a distortion diagram in the infrared region, and a lateral aberration diagram in the infrared region, respectively, according to the third embodiment of the wide-angle lens of the present invention.
Fig. 7 is a lens arrangement diagram of a fourth embodiment of a wide-angle lens according to the present invention.
Fig. 8A, 8B, 8C, 8D, 8E, 8F, 8G, and 8H are a longitudinal aberration diagram in the visible region, a field curvature diagram in the visible region, a distortion diagram in the visible region, a lateral aberration diagram in the visible region, a longitudinal aberration diagram in the infrared region, a field curvature diagram in the infrared region, a distortion diagram in the infrared region, and a lateral aberration diagram in the infrared region, respectively, according to a fourth embodiment of the wide-angle lens of the present invention.
Detailed Description
The present invention provides a wide-angle lens, including: the first lens has negative refractive power; the second lens has negative refractive power; the third lens has negative refractive power and comprises a convex surface facing the image side; the fourth lens has positive refractive power and comprises a convex surface facing the object side; the fifth lens has positive refractive power and comprises a convex surface facing the object side; the sixth lens has positive refractive power and comprises a convex surface facing the object side; the seventh lens element with refractive power has a concave surface facing the image side; the eighth lens has refractive power; the ninth lens has refractive power; and a tenth lens having refractive power, the tenth lens being a meniscus lens; the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element, the ninth lens element and the tenth lens element are sequentially disposed along an optical axis from an object side to an image side.
Please refer to the following tables i, ii, iv, v, seventh, eighth, tenth and eleventh, wherein tables i, iv, seventh and tenth are the related parameter tables of the lenses according to the first to fourth embodiments of the wide-angle lens of the present invention, respectively, and tables ii, iv, eighth and eleventh are the related parameter tables of the aspheric surfaces of the lenses according to the first, fourth, seventh and tenth.
Fig. 1, 3, 5, and 7 are schematic lens configurations of the first, second, third, and fourth embodiments of the wide-angle lens of the present invention, respectively, wherein the first lenses L11, L21, L31, and L41 have negative refractive powers made of glass, and the object-side surfaces S11, S21, S31, S41 and the image-side surfaces S12, S22, S32, and S42 are spherical surfaces.
The second lenses L12, L22, L32 and L42 have negative refractive power and are made of plastic material, and the object side surfaces S13, S23, S33 and S43 and the image side surfaces S14, S24, S34 and S44 are aspheric surfaces.
The third lenses L13, L23, L33, and L43 have negative refractive power and are made of plastic material, the image side surfaces S16, S26, S36, and S46 are convex surfaces, and the object side surfaces S15, S25, S35, and S45 and the image side surfaces S16, S26, S36, and S46 are aspheric surfaces.
The fourth lenses L14, L24, L34, and L44 have positive refractive power and are made of plastic material, the object side surfaces S17, S27, S37, and S47 are convex surfaces, and the object side surfaces S17, S27, S37, and S47 and the image side surfaces S18, S28, S38, and S48 are aspheric surfaces.
The fifth lenses L15, L25, L35 and L45 have positive refractive power and are made of glass material, the object side surfaces S110, S210, S310 and S410 are convex surfaces, and the object side surfaces S110, S210, S310 and S410 and the image side surfaces S111, S211, S311 and S411 are spherical surfaces.
The sixth lenses L16, L26, L36, and L46 have positive refractive power and are made of glass material, the object side surfaces S112, S212, S312, and S412 are convex surfaces, and the object side surfaces S112, S212, S312, and S412 and the image side surfaces S113, S213, S313, and S413 are spherical surfaces.
The seventh lenses L17, L27, L37 and L47 have negative refractive power and are made of glass material, the image side surfaces S114, S214, S314 and S416 are concave, and the object side surfaces S113, S213, S313 and S415 and the image side surfaces S114, S214, S314 and S416 are spherical surfaces.
The eighth lenses L18, L28, L38 and L48 have positive refractive power and are made of glass, and the object-side surfaces S115, S215, S315 and S416 and the image-side surfaces S116, S216, S316 and S417 are spherical surfaces.
The ninth lenses L19, L29, L39 and L49 have positive refractive power and are made of plastic material, and the object side surfaces S117, S217, S317 and S418 and the image side surfaces S118, S218, S318 and S419 are aspheric surfaces.
The tenth lens elements L110, L210, L310, and L410 are meniscus lenses having positive refractive power and made of plastic material, and the object-side surfaces S119, S219, S319, and S420 and the image-side surfaces S120, S220, S320, and S421 are aspheric surfaces.
In addition, the wide- angle lenses 1, 2, 3, 4 satisfy at least one of the following conditions:
2.7≤R11R12≤3.7 (1)
1.6≤D12R12＜1.81 (2)
64mm2≤R31×R32≤108mm2 (3)
1.8≤Nd5≤2.1 (4)
65≤Vd6+Vd7≤94 (5)
-0.95≤R72-R81≤0.40 (6)
wherein R is11In the first to fourth embodiments, the object side surfaces S11, S21, S31, and S41 of the first lenses L11, L21, L31, and L41 have radii of curvature. R12In the first to fourth embodiments, the curvature radii of the image side surfaces S12, S22, S32, S42 of the first lenses L11, L21, L31, L41 are equal. R31The object side surfaces S15, S25, S35, and S45 of the third lenses L13, L23, L33, and L43 have radii of curvature in the first to fourth embodiments. R32In the first to fourth embodiments, the third lenses L13, L23, L33, and L43 have radii of curvature of the image side surfaces S16, S26, S36, and S46. R72The image side surfaces S114, S214, S314, and S416 of the seventh lenses L17, L27, L37, and L47 have a radius of curvature in the first to fourth embodiments. R81The object side surfaces S115, S215, S315, and S416 of the eighth lenses L18, L28, L38, and L48 in the first to fourth embodiments have a radius of curvature. D12The first to fourth embodiments are the optical effective diameters of the image side surfaces S12, S22, S32, S42 of the first lenses L11, L21, L31, L41. Nd (neodymium)5The refractive indices of the fifth lenses L15, L25, L35, L45 in the first to fourth embodiments. Vd6Abbe numbers of the sixth lenses L16, L26, L36, L46 in the first to fourth embodiments. Vd7Abbe numbers of the seventh lenses L17, L27, L37, L47 in the first to fourth embodiments. Therefore, the wide- angle lenses 1, 2, 3 and 4 can effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, effectively correct the aberration, and effectively improve the quality of visible light images and infrared light images at the same time.
A first embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to fig. 1, the wide-angle lens 1 includes, in order from an object side to an image side along an optical axis OA1, a first lens element L11, a second lens element L12, a third lens element L13, a fourth lens element L14, an aperture stop ST1, a fifth lens element L15, a sixth lens element L16, a seventh lens element L17, an eighth lens element L18, a ninth lens element L19, a tenth lens element L110, a filter OF1, and a protective glass CG 1. The image-side surface S113 of the sixth lens L16 and the object-side surface S113 of the seventh lens L17 do not have an air gap therebetween, and the image-side surface S113 of the sixth lens L16 and the object-side surface S113 of the seventh lens L17 are cemented to each other with a cementing material. In imaging, light from the object side is finally imaged on the imaging surface IMA 1. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the first lens element L11 is a meniscus lens element with a convex object-side surface S11 and a concave image-side surface S12; the second lens element L12 is a meniscus lens element with a convex object-side surface S13 and a concave image-side surface S14; the third lens L13 is a meniscus lens with the object side S15 being concave; the fourth lens element L14 is a biconvex lens element, and its image-side surface S18 is convex; the fifth lens element L15 is a biconvex lens element, and its image-side surface S111 is a convex surface; the sixth lens element L16 is a biconvex lens element, and its image-side surface S113 is convex; the seventh lens L17 is a biconcave lens with negative refractive power, and its object-side surface S113 is a concave surface; the eighth lens element L18 is a biconvex lens element with positive refractive power, and has a convex object-side surface S115 and a convex image-side surface S116; the ninth lens element L19 is a biconvex lens element with positive refractive power, and has a convex object-side surface S117 and a convex image-side surface S118; the tenth lens element L110 has positive refractive power, and has a convex object-side surface S119 and a concave image-side surface S120;
the filter OF1 has an object-side surface S121 and an image-side surface S122 both being planar;
the object-side surface S123 and the image-side surface S124 of the cover glass CG1 are both planar.
By using the design that the lens, the aperture ST1 at least satisfy one of the conditions (1) to (6), the wide-angle lens 1 can effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, effectively correct the aberration, and effectively improve the quality of the visible light image and the infrared light image.
Table one is a table of relevant parameters of each lens of the wide-angle lens 1 in fig. 1.
Watch 1
Figure BDA0002031915140000071
Figure BDA0002031915140000081
The aspherical surface sag z of each lens in table i is given by the following equation:
z＝ch2/{1+[1-(k+1)c2h2]1/2}+Ah4+Bh6+Ch8+Dh10
wherein: c: a curvature; h: the vertical distance from any point on the surface of the lens to the optical axis; k: a cone coefficient; a to D: an aspheric surface coefficient.
Table II shows the relevant parameters of the aspheric surface of each lens in Table I, where k is the Conic coefficient (Conic Constant) and A-D are aspheric coefficients.
Watch two
Figure BDA0002031915140000082
Table three shows the correlation parameter values of the wide-angle lens 1 of the first embodiment and the calculated values corresponding to the conditions (1) to (6), and it can be seen from table three that the wide-angle lens 1 of the first embodiment can satisfy the requirements of the conditions (1) to (6).
Watch III
Figure BDA0002031915140000083
Figure BDA0002031915140000091
As shown in fig. 2A, the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between-0.01 mm and 0.04mm in the visible light region. As shown in fig. 2B, the field curvature of the wide-angle lens 1 of the first embodiment is between-0.03 mm and 0.04mm in the visible region. As shown in fig. 2C, the distortion of the wide-angle lens 1 of the first embodiment is between-3.5% and 0% in the visible region. As shown in FIG. 2D, the lateral chromatic aberration of the wide-angle lens 1 of the first embodiment is between-3.6 μm and 19.8 μm in the visible region. As shown in fig. 2E, the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between-0.01 mm and 0.01mm in the infrared region. As shown in fig. 2F, the field curvature of the wide-angle lens 1 of the first embodiment is between-0.03 mm and 0.03mm in the infrared region. As shown in fig. 2G, the distortion of the wide-angle lens 1 of the first embodiment is between-3.5% and 0% in the infrared region. As shown in FIG. 2H, the lateral chromatic aberration of the wide-angle lens 1 of the first embodiment is between-1.8 μm and 3.6 μm in the infrared region. It is apparent that the wide-angle lens 1 of the first embodiment can effectively correct longitudinal aberration, curvature of field, distortion and lateral chromatic aberration in the visible light region and the infrared light region, thereby obtaining better optical performance.
Referring to fig. 3, fig. 3 is a schematic lens configuration diagram of a wide-angle lens according to a second embodiment of the invention. The wide-angle lens 2 includes, in order from an object side to an image side along an optical axis OA2, a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, an aperture ST2, a fifth lens L25, a sixth lens L26, a seventh lens L27, an eighth lens L28, a ninth lens L29, a tenth lens L210, a filter OF2, and a protective glass CG 2. The image-side surface S213 of the sixth lens L26 and the object-side surface S213 of the seventh lens L27 do not have an air gap therebetween, and the image-side surface S213 of the sixth lens L26 and the object-side surface S213 of the seventh lens L27 are cemented to each other with a cement material. In imaging, light from the object side is finally imaged on the imaging surface IMA 2. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the surface shapes of the first lens L21, the second lens L22, the third lens L23, the fourth lens L24, the fifth lens L25, the sixth lens L26, the seventh lens L27, the eighth lens L28, the ninth lens L29 and the tenth lens L210 are similar to those of the first lens L11, the second lens L12, the third lens L13, the fourth lens L14, the fifth lens L15, the sixth lens L16, the seventh lens L17, the eighth lens L18, the ninth lens L19 and the tenth lens L110 in the first embodiment, respectively, and therefore, the description thereof is omitted;
the filter OF2 has an object-side surface S221 and an image-side surface S222 both being planar;
the object-side surface S223 and the image-side surface S224 of the cover glass CG2 are both planar.
By using the design of the lens, the aperture ST2 and at least one of the conditions (1) to (6), the wide-angle lens 2 can effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, effectively correct the aberration, and effectively improve the quality of the visible light image and the infrared light image.
Table four is a table of the relevant parameters of each lens of the wide-angle lens 2 in fig. 3.
Watch four
Figure BDA0002031915140000101
Figure BDA0002031915140000111
The definition of the aspheric surface sag z of each lens in table four is the same as that of the aspheric surface sag z of each lens in table one in the first embodiment, and is not repeated here.
Table five is a table of the relevant parameters of the aspherical surface of each lens in Table four, where k is a Conic coefficient (Conic Constant) and A to D are aspherical coefficients.
Watch five
Figure BDA0002031915140000112
Table six shows the relevant parameter values of the wide-angle lens 2 of the second embodiment and the calculated values corresponding to the conditions (1) to (6), and it can be seen from table six that the wide-angle lens 2 of the second embodiment can satisfy the requirements of the conditions (1) to (6).
Watch six
Figure BDA0002031915140000113
As can be seen from fig. 4A, the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between-0.02 mm and 0.04mm in the visible light region. As shown in fig. 4B, the field curvature of the wide-angle lens 2 of the second embodiment is between-0.03 mm and 0.03mm in the visible region. As shown in fig. 4C, the distortion of the wide-angle lens 2 of the second embodiment is between 0% and 4.5% in the visible light region. As shown in FIG. 4D, the lateral chromatic aberration of the wide-angle lens 2 of the second embodiment is between-3.6 μm and 21.6 μm in the visible region. As shown in FIG. 4E, the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between-0.01 mm and 0.01mm in the infrared region. As shown in FIG. 4F, the field curvature of the wide-angle lens 2 of the second embodiment is between-0.01 mm and 0.07mm in the infrared region. As shown in fig. 4G, the distortion of the wide-angle lens 2 of the second embodiment is between 0% and 5% in the infrared region. As shown in FIG. 4H, the lateral chromatic aberration of the wide-angle lens 2 of the second embodiment is between-1.8 μm and 3.6 μm in the infrared region. It is apparent that the wide-angle lens 2 of the second embodiment can effectively correct longitudinal aberration, curvature of field, distortion and transverse chromatic aberration in the visible light region and the infrared light region, thereby obtaining better optical performance.
Referring to fig. 5, fig. 5 is a schematic lens configuration diagram of a wide-angle lens according to a third embodiment of the invention. The wide-angle lens 3 includes, in order from an object side to an image side along an optical axis OA3, a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, an aperture ST3, a fifth lens L35, a sixth lens L36, a seventh lens L37, an eighth lens L38, a ninth lens L39, a tenth lens L310, a filter OF3, and a protective glass CG 3. The image-side surface S313 of the sixth lens L36 and the object-side surface S313 of the seventh lens L37 do not have an air gap therebetween, and the image-side surface S313 of the sixth lens L36 and the object-side surface S313 of the seventh lens L37 are cemented to each other with a cementing material. In imaging, light from the object side is finally imaged on the imaging surface IMA 3. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the surface shapes of the first lens L31, the second lens L32, the third lens L33, the fourth lens L34, the fifth lens L35, the sixth lens L36, the seventh lens L37, the eighth lens L38, the ninth lens L39 and the tenth lens L310 are respectively similar to the surface shapes of the first lens L11, the second lens L12, the third lens L13, the fourth lens L14, the fifth lens L15, the sixth lens L16, the seventh lens L17, the eighth lens L18, the ninth lens L19 and the tenth lens L110 in the first embodiment, and therefore, the description thereof is omitted;
the optical filter OF3 has an object-side surface S321 and an image-side surface S322 both being planar;
the object-side surface S323 and the image-side surface S324 of the cover glass CG3 are both planar.
By using the design of the lens, the aperture ST3 and at least one of the conditions (1) to (6), the wide-angle lens 3 can effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, effectively correct the aberration, and effectively improve the quality of the visible light image and the infrared light image.
Table seven is a table of the relevant parameters of each lens of the wide-angle lens 3 in fig. 5.
Watch seven
Figure BDA0002031915140000121
Figure BDA0002031915140000131
The definition of the aspheric surface sag z of each lens in table seven is the same as that of the aspheric surface sag z of each lens in table one in the first embodiment, and is not repeated here.
Table eight is a table of parameters relating to the aspherical surfaces of the respective lenses in Table seven, where k is a Conic coefficient (Conic Constant) and A to D are aspherical coefficients.
Table eight
Figure BDA0002031915140000141
Table nine shows the values of the parameters associated with the wide-angle lens 3 of the third embodiment and the calculated values corresponding to the conditions (1) to (6), and it can be seen from table nine that the wide-angle lens 3 of the third embodiment can satisfy the requirements of the conditions (1) to (6).
Watch nine
D12 12.722mm
R11/R12 2.739 D12/R12 1.746 R31×R32 64.007mm2
Vd6+Vd7 93.480 R72－R81 0.331
As can be seen from fig. 6A, the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between-0.01 mm and 0.03mm in the visible light region. As shown in fig. 6B, the field curvature of the wide-angle lens 3 of the third embodiment is between-0.03 mm and 0.04mm in the visible region. As shown in fig. 6C, the distortion of the wide-angle lens 3 of the third embodiment is between-7% and 0% in the visible region. As shown in FIG. 6D, the wide-angle lens 3 of the third embodiment has a lateral chromatic aberration in the visible region between-1.8 μm and 16.2 μm. As shown in FIG. 6E, the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between-0.01 mm and 0.02mm in the infrared region. As shown in fig. 6F, the field curvature of the wide-angle lens 3 of the third embodiment is between-0.03 mm and 0.02mm in the infrared region. As shown in fig. 6G, the distortion of the wide-angle lens 3 of the third embodiment is between-7% and 0% in the infrared region. As shown in FIG. 6H, the lateral chromatic aberration of the wide-angle lens 3 of the third embodiment is between-1.8 μm and 3.6 μm in the infrared region.
It is apparent that the wide-angle lens 3 of the third embodiment can effectively correct longitudinal aberration, curvature of field, distortion and lateral chromatic aberration in the visible light region and the infrared light region, thereby obtaining better optical performance.
Referring to fig. 7, fig. 7 is a schematic lens configuration diagram of a wide-angle lens according to a fourth embodiment of the invention. The wide-angle lens 4 includes, in order from an object side to an image side along an optical axis OA4, a first lens element L41, a second lens element L42, a third lens element L43, a fourth lens element L44, an aperture ST4, a fifth lens element L45, a sixth lens element L46, an eleventh lens element L411, a seventh lens element L47, an eighth lens element L48, a ninth lens element L49, a tenth lens element L410, a filter OF4, and a protective glass CG 4. The image-side surface S415 of the eleventh lens L411 and the object-side surface S415 of the seventh lens L47 do not have an air gap therebetween, but the image-side surface S415 of the eleventh lens L411 and the object-side surface S415 of the seventh lens L47 are cemented with each other by a cementing material, and the image-side surface S416 of the seventh lens L47 and the object-side surface S416 of the eighth lens L48 do not have an air gap therebetween, but the image-side surface S416 of the seventh lens L47 and the object-side surface S416 of the eighth lens L48 are cemented with each other by a cementing material. In imaging, light from the object side is finally imaged on the imaging surface IMA 4. According to [ embodiments ] the first to twelfth paragraphs, wherein:
the fifth lens element L45 is a meniscus lens element with a concave image-side surface S411; the sixth lens element L46 is a meniscus lens element with the image-side surface S413 being concave; the tenth lens element L410 has a concave object-side surface S420 and a convex image-side surface S421; the eleventh lens element L411 is a biconvex lens with positive refractive power, and has a convex object-side surface S414, a convex image-side surface S415, and spherical object-side surfaces S414 and S415; the surface shapes of the first lens L41, the second lens L42, the third lens L43, the fourth lens L44, the seventh lens L37, the eighth lens L38 and the ninth lens L39 are similar to those of the first lens L11, the second lens L12, the third lens L13, the fourth lens L14, the seventh lens L17, the eighth lens L18 and the ninth lens L19 in the first embodiment, respectively, and therefore, the description thereof is omitted;
the filter OF4 has an object-side surface S422 and an image-side surface S423 that are both planar;
the object-side surface S424 and the image-side surface S425 of the cover glass CG4 are both planar.
By using the design of the lens, the aperture ST4 and at least one of the conditions (1) to (6), the wide-angle lens 4 can effectively increase the field of view, effectively reduce the aperture value, effectively improve the resolution, effectively correct the aberration, and effectively improve the quality of the visible light image and the infrared light image.
Table ten is a table of the relevant parameters of each lens of the wide-angle lens 4 in fig. 7.
Watch ten
Figure BDA0002031915140000151
Figure BDA0002031915140000161
The definition of the aspheric surface sag z of each lens in table ten is the same as that of the aspheric surface sag z of each lens in table one in the first embodiment, and is not repeated here.
Table eleven is a table of relevant parameters of the aspherical surface of each lens in Table ten, where k is a Conic coefficient (Conic Constant) and A to D are aspherical coefficients.
Watch eleven
Figure BDA0002031915140000171
Table twelve shows the correlation parameter values of the wide-angle lens 4 of the fourth embodiment and the calculated values corresponding to the conditions (1) to (6), and it can be seen from table twelve that the wide-angle lens 4 of the fourth embodiment can satisfy the requirements of the conditions (1) to (6).
Watch twelve
D12 11.664mm
R11/R12 3.664 D12/R12 1.801 R31×R32 107.231mm2
Vd6+Vd7 65.820 R72－R 81 0
As shown in FIG. 8A, the longitudinal aberration of the wide-angle lens 4 of the fourth embodiment is between-0.01 mm and 0.06mm in the visible light region. As shown in fig. 8B, the field curvature of the wide-angle lens 4 of the fourth embodiment is between-0.01 mm and 0.07mm in the visible region. As shown in fig. 8C, the distortion of the wide-angle lens 4 of the fourth embodiment is between-4.2% and 0.7% in the visible region. As shown in FIG. 8D, the wide-angle lens 4 of the fourth embodiment has a lateral chromatic aberration in the visible light range from-1.8 μm to 21.6 μm. As shown in fig. 8E, the longitudinal aberration of the wide-angle lens 4 of the fourth embodiment is between 0mm and 0.02mm in the infrared region. As shown in fig. 8F, the field curvature of the wide-angle lens 4 of the fourth embodiment is between-0.01 mm and 0.02mm in the infrared region. As shown in fig. 8G, the distortion of the wide-angle lens 4 of the fourth embodiment is between-4.2% and 0.7% in the infrared region.
As shown in FIG. 8H, the lateral chromatic aberration of the wide-angle lens 4 of the fourth embodiment is between-3.6 μm and 1.8 μm in the infrared region.
It is apparent that the wide-angle lens 4 of the fourth embodiment can effectively correct longitudinal aberration, curvature of field, distortion and lateral chromatic aberration in the visible light region and the infrared light region, thereby obtaining better optical performance.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims (5)

1. A wide-angle lens, comprising:
the first lens has negative refractive power;
the second lens has negative refractive power;
the third lens has negative refractive power and comprises a convex surface facing the image side;
the fourth lens has positive refractive power and comprises a convex surface facing the object side;
the fifth lens has positive refractive power and comprises a convex surface facing the object side;
the sixth lens has positive refractive power and comprises a convex surface facing the object side;
the seventh lens has negative refractive power and comprises a concave surface facing the image side;
the eighth lens has positive refractive power;
the ninth lens has positive refractive power; and
the tenth lens has positive refractive power, and is a meniscus lens;
wherein the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element, the ninth lens element and the tenth lens element are sequentially disposed along an optical axis from the object side to the image side;
the wide-angle lens at least meets any one of the following conditions:
2.7≤R11/R12≤3.7；
1.6≤D12/R12<1.81；
64mm2≤R31×R32≤108mm2；
1.8≤Nd5≤2.1；
65≤Vd6+Vd7≤94；
-0.95≤R72-R81≤0.40；
wherein R is11Is the radius of curvature, R, of the object-side surface of the first lens12Is the radius of curvature of the image-side surface of the first lens element, D12Is the optical effective diameter, R, of the image side surface of the first lens31Is the radius of curvature, R, of the object-side surface of the third lens32Is the radius of curvature of the image-side surface of the third lens, Nd5Is a refractive index of the fifth lens, Vd6Is Abbe number, Vd, of the sixth lens7Is Abbe's number, R, of the seventh lens72Is the radius of curvature, R, of the image-side surface of the seventh lens element81Is the radius of curvature of the object-side surface of the eighth lens.
2. The wide-angle lens of claim 1, wherein:
the first lens element includes a convex surface facing the object side and a concave surface facing the image side;
the second lens element includes a convex surface facing the object side and a concave surface facing the image side;
the third lens element further includes a concave surface facing the object side;
the fourth lens element further includes a convex surface facing the image side;
the fifth lens element further comprises a convex surface facing the image side;
the sixth lens element further includes a convex surface facing the image side;
the seventh lens element has negative refractive power and further includes a concave surface facing the object side;
the eighth lens element with positive refractive power has a convex surface facing the object side and another convex surface facing the image side;
the ninth lens element with positive refractive power has a convex surface facing the object side and another convex surface facing the image side; and
the tenth lens element has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side.
3. The wide-angle lens of claim 1, further comprising an eleventh lens disposed between the sixth lens and the seventh lens, wherein:
the first lens element includes a convex surface facing the object side and a concave surface facing the image side;
the second lens element includes a convex surface facing the object side and a concave surface facing the image side;
the third lens element further includes a concave surface facing the object side;
the fourth lens element further includes a convex surface facing the image side;
the fifth lens element further comprises a concave surface facing the image side;
the sixth lens element further includes a concave surface facing the image side;
the seventh lens element has negative refractive power and further includes a concave surface facing the object side;
the eighth lens element with positive refractive power has a convex surface facing the object side and another convex surface facing the image side;
the ninth lens element with positive refractive power has a convex surface facing the object side and another convex surface facing the image side;
the tenth lens element with positive refractive power has a concave surface facing the object side and a convex surface facing the image side; and
the eleventh lens element has positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side.
4. The wide-angle lens of claim 3, wherein the eleventh lens, the seventh lens and the eighth lens are cemented.
5. The wide-angle lens of claim 1 or 2, wherein the sixth lens and the seventh lens are cemented.
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JP2004085600A (en) * 2002-08-22 2004-03-18 Pentax Corp Wide angle zoom lens system
CN109358465A (en) * 2018-12-11 2019-02-19 厦门力鼎光电股份有限公司 A kind of optical imaging lens

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US10606046B2 (en) * 2015-07-20 2020-03-31 Young Optics Inc. Zoom lens

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004085600A (en) * 2002-08-22 2004-03-18 Pentax Corp Wide angle zoom lens system
CN109358465A (en) * 2018-12-11 2019-02-19 厦门力鼎光电股份有限公司 A kind of optical imaging lens

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