CN117369098A - Wide-angle lens - Google Patents

Wide-angle lens Download PDF

Info

Publication number
CN117369098A
CN117369098A CN202210768321.0A CN202210768321A CN117369098A CN 117369098 A CN117369098 A CN 117369098A CN 202210768321 A CN202210768321 A CN 202210768321A CN 117369098 A CN117369098 A CN 117369098A
Authority
CN
China
Prior art keywords
lens
wide
refractive power
angle
object side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210768321.0A
Other languages
Chinese (zh)
Inventor
李建纬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
Original Assignee
Sintai Optical Shenzhen Co Ltd
Asia Optical Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sintai Optical Shenzhen Co Ltd, Asia Optical Co Inc filed Critical Sintai Optical Shenzhen Co Ltd
Priority to CN202210768321.0A priority Critical patent/CN117369098A/en
Publication of CN117369098A publication Critical patent/CN117369098A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G02B13/001—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
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

Abstract

A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has a negative refractive power and includes a concave surface facing the object side, the second lens has a refractive power, the third lens has a positive refractive power, the fourth lens has a refractive power, the fifth lens has a refractive power, the sixth lens has a refractive power, and the seventh lens has a positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged from an object side to an image side along the optical axis.

Description

Wide-angle lens
Technical Field
The invention relates to a wide-angle lens.
Background
In addition to the continuous development of wide-angle lenses towards large fields of view, the present wide-angle lenses have to have large aperture and high resolution characteristics according to different application requirements, and the present wide-angle lenses cannot meet the present requirements, and a wide-angle lens with another new architecture is required to meet the requirements of large field of view, large aperture and high resolution.
Disclosure of Invention
The invention aims to solve the technical problem that the wide-angle lens in the prior art cannot simultaneously meet the defects of large field of view, large aperture and high resolution, and provides the wide-angle lens which has larger field of view, smaller aperture value and higher resolution, but still has good optical performance.
The invention provides a wide-angle lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has a negative refractive power and includes a concave surface facing the object side, the second lens has a refractive power, the third lens has a positive refractive power, the fourth lens has a refractive power, the fifth lens has a refractive power, the sixth lens has a refractive power, and the seventh lens has a positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged from an object side to an image side along the optical axis. When the wide-angle lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic functions of the wide-angle lens of the present invention can be achieved.
The second lens has positive refractive power, and comprises a concave surface facing the object side and a convex surface facing the image side.
The fourth lens may further include another convex surface or a concave surface facing the object side.
The wide-angle lens of the present invention may further comprise an aperture stop disposed between the first lens and the second lens.
Wherein the wide angle lens satisfies the following conditions: L1D/DSL2 is more than or equal to 6.2 and less than or equal to 10.5; wherein L1D is the outer diameter of the first lens element, and DSL2 is the air space between the aperture stop and the object side surface of the second lens element on the optical axis.
The first lens element may further comprise a concave surface facing the image side, and the third lens element may comprise a concave surface facing the object side and a convex surface facing the image side.
The seventh lens is a biconvex lens, and comprises a convex surface facing the object side and another convex surface facing the image side.
The fifth lens is a biconvex lens with positive refractive power, and comprises a convex surface facing the object side and another convex surface facing the image side, and the sixth lens is a biconcave lens with negative refractive power, and comprises a concave surface facing the object side and another concave surface facing the image side.
Wherein the fifth lens and the sixth lens are cemented.
Wherein the wide-angle lens at least meets one of the following conditions: TTL/HIH is more than or equal to 7.8 and less than or equal to 8.6; f3/f is more than or equal to 5 and less than or equal to 12; f7/f is more than or equal to 1.8 and less than or equal to 2.4; -4.5mm < ltoreq.R21×R22)/(R21+R22) < ltoreq.2.8 mm; -10.1mm < R31X R32)/(R31 + R32) < 4.8mm; wherein TTL is the distance from the object side surface of the first lens element to the image plane on the optical axis, HIH is the half-image height of the wide-angle lens element, f3 is the effective focal length of the third lens element, f7 is the effective focal length of the seventh lens element, f is the effective focal length of the wide-angle lens element, R21 is the radius of curvature of the object side surface of the second lens element, R22 is the radius of curvature of the image side surface of the second lens element, R31 is the radius of curvature of the object side surface of the third lens element, and R32 is the radius of curvature of the image side surface of the third lens element.
The wide-angle lens has the following beneficial effects: the optical lens has the advantages of larger field of view, smaller aperture value and higher resolution, but still has good optical performance.
Drawings
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Fig. 1 is a schematic view of a lens configuration and an optical path of a second embodiment of a wide-angle lens according to the present invention.
Fig. 2, 3, and 4 are Field Curvature (Field Curvature) map, distortion (Distortion) map, and Spot Diagram (Spot Diagram), respectively, of a second embodiment of a wide-angle lens according to the present invention.
Fig. 5 is a schematic diagram of a lens configuration and an optical path of a third embodiment of a wide-angle lens according to the present invention.
Fig. 6, 7, 8 are field diagrams, distortion diagrams, and light point diagrams of a third embodiment of a wide-angle lens according to the present invention.
Fig. 9 is a schematic diagram of a lens configuration and an optical path of a fourth embodiment of a wide-angle lens according to the present invention.
Fig. 10, 11, 12 are field diagrams, distortion diagrams, and light point diagrams of a fourth embodiment of a wide-angle lens according to the present invention.
Detailed Description
The present invention provides a wide-angle lens, comprising: the first lens has negative refractive power and comprises a concave surface facing the object side; the second lens has refractive power and is a meniscus lens; the third lens has positive refractive power, and is a meniscus lens; the fourth lens has refractive power; the fifth lens has refractive power; the sixth lens has refractive power; and the seventh lens has a positive refractive power; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged from an object side to an image side along the optical axis. When the wide-angle lens of the present invention meets the above characteristics and conditions, it is a preferred embodiment of the present invention.
Please refer to the following table one, table two, table four, table five, table seven, table eight, table ten and table eleven, wherein table one, table four, table seven and table eleven are the related parameter tables of each lens of the first embodiment to the fourth embodiment of the wide-angle lens according to the present invention, table two, table five, table eight and table eleven are the related parameter tables of the aspherical surface of the aspherical lens in table one, table four, table seven and table eleven, respectively, and in each of the following embodiments, the aspherical surface dishing degree z of the aspherical lens is obtained by the following formula: z=ch 2 /{1+[1-(k+1)c 2 h 2 ] 1/2 }+Ah 4 +Bh 6 +Ch 8 +Dh 10 +Eh 12 +Fh 14 Wherein: c is curvature, h is the vertical distance from any point of the lens surface to the optical axis, k is the Conic Constant, A-F are aspheric coefficients, and E in the coefficients represents a scientific sign, e.g., E-03 represents 10 -3 。
Fig. 1, 5 and 9 are lens configurations and optical paths of the second, third and fourth embodiments of the wide-angle lens of the present invention, respectively, and the lens configurations and optical paths of the first embodiment of the remaining wide-angle lens are omitted, but in the following description, reference numerals of the first embodiment will be used for convenience of description. The first lenses L11, L21, L31, L41 are biconcave lenses with negative refractive power, and are made of glass material, the object-side surfaces S11, S21, S31, S41 are concave surfaces, the image-side surfaces S12, S22, S32, S42 are concave surfaces, and the object-side surfaces S11, S21, S31, S41 and the image-side surfaces S12, S22, S32, S42 are spherical surfaces.
The second lenses L12, L22, L32, L42 are meniscus lenses with positive refractive power, and are made of glass material, the object side surfaces S14, S24, S34, S44 are concave surfaces, the image side surfaces S15, S25, S35, S45 are convex surfaces, and the object side surfaces S14, S24, S34, S44 and the image side surfaces S15, S25, S35, S45 are aspheric surfaces.
The third lenses L13, L23, L33, L43 are meniscus lenses with positive refractive power, and are made of glass material, the object side surfaces S16, S26, S36, S46 are concave surfaces, the image side surfaces S17, S27, S37, S47 are convex surfaces, and the object side surfaces S16, S26, S36, S46 and the image side surfaces S17, S27, S37, S47 are spherical surfaces.
The fourth lenses L14, L24, L34, L44 have positive refractive power, and are made of glass material, and the image sides S19, S29, S39, S49 are convex, and the object sides S18, S28, S38, S48 and the image sides S19, S29, S39, S49 are spherical surfaces.
The fifth lenses L15, L25, L35, L45 are biconvex lenses having positive refractive power, and are made of glass material, wherein the object-side surfaces S110, S210, S310, S410 are convex surfaces, the image-side surfaces S111, S211, S311, S411 are convex surfaces, and the object-side surfaces S110, S210, S310, S410 and the image-side surfaces S111, S211, S311, S411 are spherical surfaces.
The sixth lenses L16, L26, L36, L46 are biconcave lenses with negative refractive power, and are made of glass material, the object-side surfaces S111, S211, S311, S411 are concave surfaces, the image-side surfaces S112, S212, S312, S412 are concave surfaces, and the object-side surfaces S111, S211, S311, S411 and the image-side surfaces S112, S212, S312, S412 are spherical surfaces.
The seventh lenses L17, L27, L37, L47 are biconvex lenses having positive refractive power, and are made of glass material, wherein the object sides S113, S213, S313, S413 are convex, the image sides S114, S214, S314, S414 are convex, and the object sides S113, S213, S313, S413 and the image sides S114, S214, S314, S414 are aspheric.
The fifth lenses L15, L25, L35, and L45 are bonded to the sixth lenses L16, L26, L36, and L46, respectively.
In addition, the wide-angle lenses 1, 2, 3, 4 at least satisfy one of the following conditions (1) to (6), which is a preferred embodiment of the present invention:
7.8≤TTL/HIH≤8.6； (1)
5≤f3/f≤12； (2)
1.8≤f7/f≤2.4； (3)
-4.5mm≤(R21×R22)/(R21+R22)≤-2.8mm； (4)
-10.1mm≤(R31×R32)/(R31+R32)≤-4.8mm； (5)
6.2≤L1D/DSL2≤10.5； (6)
wherein TTL is the distance between the object side surfaces S11, S21, S31, S41 of the first lenses L11, L21, L31, L41 and the imaging surfaces IMA1, IMA2, IMA3, IMA4 on the optical axes OA1, OA2, OA3, OA, HIH is the half image height of the wide-angle lenses 1, 2, 3, 4 in the first to fourth embodiments, f3 is the effective focal length of the third lenses L13, L23, L33, L43 in the first to fourth embodiments, f7 is the effective focal length of the seventh lenses L17, L27, L37, L47 in the first to fourth embodiments, f is the effective focal length of the lenses 1, 2, 3, 4 in the first to fourth embodiments, R21 is the radius of curvature of the object side surfaces S14, S44, S34 of the second lenses L12, L22, L32, L42 in the first to fourth embodiments, R22 is the radius of curvature of the image sides S15, S25, S35, S45 of the second lenses L12, L22, L32, L42, R31 is the radius of curvature of the object sides S16, S26, S36, S46 of the third lenses L13, L23, L33, L43, R32 is the radius of curvature of the image sides S17, S27, S37, S47 of the third lenses L13, L23, L33, L43, L1D is the outer diameter of the first lenses L11, L21, L31, L41, and DSL2 is the air pitch of the diaphragms ST1, ST2, ST3, ST4 to the object sides S14, S24, S34, S44 of the second lenses L12, L22, L42 on the optical axes OA1, OA3, OA4, on the first to fourth embodiments. The wide-angle lenses 1, 2, 3 and 4 can effectively improve the view field, the resolution and the aberration and correct the aberration.
When the condition (1) is satisfied: when TTL/HIH is more than or equal to 7.8 and less than or equal to 8.6, the total length of the lens can be effectively shortened. When the condition (2) is satisfied: when f3/f is less than or equal to 5 and less than or equal to 12, the influence of the first lens with negative refractive power can be effectively balanced. When the condition (3) is satisfied: when f7/f is less than or equal to 1.8 and less than or equal to 2.4, the angle of the principal ray can be effectively reduced. When the condition (4) is satisfied: when the (R21×R22)/(R21+R22) is less than or equal to 4.5mm and less than or equal to-2.8 mm, the spherical aberration can be effectively reduced. When the condition (5) is satisfied: when the (R31×R32)/(R31+R32) is less than or equal to 10.1mm and less than or equal to-4.8 mm, the field curvature can be effectively reduced. When the condition (6) is satisfied: when L1D/DSL2 is more than or equal to 6.2 and less than or equal to 10.5, the outer diameter size of the first lens can be effectively controlled. When the condition (4) is satisfied at the same time: -4.5mm < (R21×R22)/(R21+R22) < 2.8mm and condition (5): when the ratio of (R31×R32)/(R31+R32) is less than or equal to 10.1mm and less than or equal to-4.8 mm, the aberration can be effectively reduced.
When the first lens is a biconcave lens with negative refractive power, the optical path can be effectively adjusted so that the first lens is not easy to have large turning. When the second lens is a meniscus type aspheric lens with positive refractive power, the chromatic aberration caused by the biconcave lens of the first lens can be effectively reduced, and the purpose of reducing the chromatic aberration is achieved. When the object side surface of the third lens element is convex, and has positive refractive power, the total length of the lens assembly can be effectively adjusted. When the image side surface of the fourth lens element is convex and has positive refractive power, the total length of the lens assembly can be effectively adjusted. When the fifth lens and the sixth lens are glued, the axial chromatic aberration and the transverse chromatic aberration can be effectively eliminated, so that the resolution of the wide-angle lens can be improved. When the seventh lens is an aspheric lens with positive refractive power, the angle of the principal ray can be effectively reduced, and the length of the back focal length can be increased, which is beneficial to the assembly of the wide-angle lens.
A first embodiment of the wide-angle lens of the present invention will now be described in detail. The wide-angle lens (not shown) includes, in order from the object side to the image side along the optical axis OA1, a first lens L11, an aperture stop ST1, a second lens L12, a third lens L13, a fourth lens L14, a fifth lens L15, a sixth lens L16, a seventh lens L17, an optical filter OF1, and a protective glass CG1. In imaging, light from the object side is finally imaged on the imaging plane IMA 1. According to the first to tenth paragraphs [ detailed description ], wherein: the fourth lens L14 is a biconvex lens, and the object side surface S18 thereof is a convex surface; the object side surface S115 and the image side surface S116 OF the optical filter OF1 are both plane surfaces; the object side surface S117 and the image side surface S118 of the protective glass CG1 are both plane surfaces; by utilizing the lens, the aperture ST1 and the design satisfying at least one of the conditions (1) to (6), the wide-angle lens 1 (not shown) can effectively improve the field of view, the resolution, the aberration and the chromatic aberration.
Table one is a table of relevant parameters of each lens of the wide-angle lens (not shown).
List one
The second table is a table of related parameters of the aspherical surface of the aspherical lens in the first table.
Watch II
Table three shows the relevant 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 is known from the table three that the wide-angle lens 1 of the first embodiment can meet the requirements of the conditions (1) to (6).
Watch III
A second embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to fig. 1, 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, an aperture stop ST2, a second lens L22, a third lens L23, a fourth lens L24, a fifth lens L25, a sixth lens L26, a seventh lens L27, an optical filter OF2 and a protective glass CG2. In imaging, light from the object side is finally imaged on the imaging plane IMA 2. According to the first to tenth paragraphs [ detailed description ], wherein: the fourth lens L24 is a biconvex lens, and an object side surface S28 thereof is a convex surface; the object side surface S215 and the image side surface S216 OF the optical filter OF2 are both plane surfaces; the object side surface S217 and the image side surface S218 of the protecting glass CG2 are both plane surfaces; by utilizing the lens, the aperture ST2 and the design meeting at least one of the conditions (1) to (6), the wide-angle lens 2 can effectively improve the view field, the resolution, the aberration and the chromatic aberration.
Table four is a table of relevant parameters for each lens of the wide-angle lens 2 in fig. 1.
Table four
Table five is a table of relevant parameters for the aspherical surface of the aspherical lens in table four.
TABLE five
Table six is the calculated values of the related parameter values of the wide-angle lens 2 and the corresponding conditions (1) to (6) of the second embodiment, and it is known from the table six that the wide-angle lens 2 of the second embodiment can meet the requirements of the conditions (1) to (6).
TABLE six
In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements. As can be seen from fig. 2, the wide-angle lens 2 of the second embodiment has a curvature of field between-0.02 mm and 0.03 mm. As can be seen from fig. 3, the wide-angle lens 2 of the second embodiment has a distortion between-60% and 0%. As can be seen from fig. 4, the wide-angle lens 2 of the second embodiment has a root mean Square (root Square) radius of a light spot of 1.973 μm, a geometric radius of a light spot of 4.743 μm when the image height is 0.000mm, a root mean Square radius of a light spot of 2.341 μm when the image height is 1.008mm, a geometric radius of a light spot of 7.728 μm when the image height is 2.016mm, a root mean Square radius of a light spot of 2.300 μm, a geometric radius of a light spot of 8.734 μm when the image height is 3.024mm, a root mean Square radius of a light spot of 2.172 μm, a geometric radius of a light spot of 6.482 μm, a root mean Square radius of a light spot of 6.218 μm when the image height is 4.032mm, and a geometric radius of a light spot of 17.298 μm. It is apparent that the curvature of field and distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, thereby obtaining a preferable optical performance.
A third embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to fig. 5, 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, an aperture stop ST3, a second lens L32, a third lens L33, a fourth lens L34, a fifth lens L35, a sixth lens L36, a seventh lens L37, an optical filter OF3 and a protective glass CG3. In imaging, light from the object side is finally imaged on the imaging plane IMA 3. According to the first to tenth paragraphs [ detailed description ], wherein: the fourth lens L34 is a meniscus lens, and an object-side surface S38 thereof is a concave surface; the optical filter OF3 has a plane on both the object side surface S315 and the image side surface S316; the object side surface S317 and the image side surface S318 of the protecting glass CG3 are both plane surfaces; by utilizing the lens, the aperture ST3 and the design meeting at least one of the conditions (1) to (6), the wide-angle lens 3 can effectively improve the view field, the resolution, the aberration and the chromatic aberration.
Table seven is a table of relevant parameters for each lens of the wide-angle lens 3 in fig. 5.
Watch seven
Table eight is a table of relevant parameters for the aspherical surface of the aspherical lens in table seven.
Table eight
Table nine is the values of the parameters related to the wide-angle lens 3 of the third embodiment and the calculated values corresponding to the conditions (1) to (6), and it is clear from table nine that the wide-angle lens 3 of the third embodiment can meet the requirements of the conditions (1) to (6).
Table nine
In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements. As can be seen from fig. 6, the wide-angle lens 3 of the third embodiment has a curvature of field of between-0.02 mm and 0.03 mm. As can be seen from fig. 7, the wide-angle lens 3 of the third embodiment has a distortion of between-60% and 0%. As can be seen from fig. 8, the wide-angle lens 3 of the third embodiment has a root mean square radius of a light spot of 1.571 μm when the image height is 0.000mm, a geometric radius of a light spot of 3.809 μm when the image height is 1.008mm, a geometric radius of a light spot of 5.491 μm when the image height is 2.016mm, a root mean square radius of a light spot of 1.886 μm, a geometric radius of a light spot of 6.255 μm when the image height is 3.024mm, a root mean square radius of a light spot of 2.080 μm, a geometric radius of a light spot of 6.277 μm when the image height is 4.032mm, a root mean square radius of a light spot of 6.850 μm, and a geometric radius of a light spot of 20.651 μm. It is apparent that the curvature of field and distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, thereby obtaining a preferable optical performance.
A fourth embodiment of the wide-angle lens of the present invention will now be described in detail. Referring to fig. 9, the wide-angle lens 4 includes, in order from an object side to an image side along an optical axis OA4, a first lens L41, an aperture stop ST4, a second lens L42, a third lens L43, a fourth lens L44, a fifth lens L45, a sixth lens L46, a seventh lens L47, an optical filter OF4 and a protective glass CG4. In imaging, light from the object side is finally imaged on the imaging plane IMA 4. According to the first to tenth paragraphs [ detailed description ], wherein: the fourth lens element L44 is a meniscus lens element, and an object-side surface S48 thereof is a concave surface; the optical filter OF4 has a plane on the object side surface S415 and the image side surface S416; the object side surface S417 and the image side surface S418 of the protecting glass CG4 are both plane surfaces; by utilizing the lens, the aperture ST4 and the design meeting at least one of the conditions (1) to (6), the wide-angle lens 4 can effectively improve the view field, the resolution, the aberration and the chromatic aberration.
Table ten is a table of relevant parameters for each lens of the wide-angle lens 4 in fig. 9.
Ten meters
Table eleven is a table of related parameters of the aspherical surface of the aspherical lens in table ten.
Table eleven
Table twelve shows the relevant 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 is clear from table twelve that the wide-angle lens 4 of the fourth embodiment can meet the requirements of the conditions (1) to (6).
Twelve watches
In addition, the optical performance of the wide-angle lens 4 of the fourth embodiment can also meet the requirements. As can be seen from fig. 10, the wide-angle lens 4 of the fourth embodiment has a curvature of field of between-0.02 mm and 0.02 mm. As can be seen from fig. 11, the wide-angle lens 4 of the fourth embodiment has a distortion between-60% and 0%. As can be seen from fig. 12, the wide-angle lens 4 of the fourth embodiment has a root mean square radius of 0.703 μm for a light spot, a geometric radius of 1.676 μm for a light spot, a root mean square radius of 0.926 μm for a 1.008mm image height, a geometric radius of 3.827 μm for a light spot, a root mean square radius of 1.284 μm for a 2.016mm image height, a geometric radius of 5.206 μm for a light spot, a root mean square radius of 2.157 μm for a 3.024mm image height, a geometric radius of 6.561 μm for a light spot, a root mean square radius of 8.271 μm for a 4.032mm image height, and a geometric radius of 23.898 μm. It is apparent that the curvature of field and distortion of the wide-angle lens 4 of the fourth embodiment can be effectively corrected, thereby obtaining a preferable optical performance.
While the invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the following claims.

Claims (10)

1. A wide-angle lens, comprising:
the first lens has negative refractive power and comprises a concave surface facing the object side;
the second lens has refractive power and is a meniscus lens;
the third lens has positive refractive power and is a meniscus lens;
the fourth lens has refractive power;
the fifth lens has refractive power;
the sixth lens has refractive power; and
the seventh lens has positive 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 and the seventh lens element are arranged in order along an optical axis from an object side to an image side.
2. The wide-angle lens of claim 1, wherein:
the second lens has positive refractive power and comprises a concave surface facing the object side and a convex surface facing the image side; and
the fourth lens has positive refractive power and comprises a convex surface facing the image side.
3. The wide-angle lens of claim 2, wherein the fourth lens further comprises another convex surface or a concave surface facing the object side.
4. The wide-angle lens of claim 1, further comprising an aperture stop disposed between the first lens and the second lens.
5. The wide-angle lens of claim 4, wherein the wide-angle lens satisfies the following condition:
6.2≤L1D/DSL2≤10.5；
wherein L1D is the outer diameter of the first lens element, and DSL2 is the air space between the aperture stop and the object side surface of the second lens element on the optical axis.
6. The wide-angle lens of claim 1,
the first lens is a biconcave lens and further comprises another concave surface facing the image side; and
the third lens comprises a concave surface facing the object side and a convex surface facing the image side.
7. The wide-angle lens of claim 1, wherein the seventh lens is a biconvex lens and comprises a convex surface facing the object side and another convex surface facing the image side.
8. The wide-angle lens of claim 1,
the fifth lens is a biconvex lens and has positive refractive power, and comprises a convex surface facing the object side and another convex surface facing the image side; and
the sixth lens is a biconcave lens with negative refractive power, and comprises a concave surface facing the object side and another concave surface facing the image side.
9. The wide-angle lens of claim 1, wherein the fifth lens and the sixth lens are cemented.
10. The wide-angle lens of any one of claims 1 to 9, wherein the wide-angle lens satisfies at least one of the following conditions:
7.8≤TTL/HIH≤8.6；
5≤f3/f≤12；
1.8≤f7/f≤2.4；
-4.5mm≤(R21×R22)/(R21+R22)≤-2.8mm；
-10.1mm≤(R31×R32)/(R31+R32)≤-4.8mm；
wherein TTL is the distance from the object side surface of the first lens element to the image plane on the optical axis, HIH is the half-image height of the wide-angle lens element, f3 is the effective focal length of the third lens element, f7 is the effective focal length of the seventh lens element, f is the effective focal length of the wide-angle lens element, R21 is the radius of curvature of the object side surface of the second lens element, R22 is the radius of curvature of the image side surface of the second lens element, R31 is the radius of curvature of the object side surface of the third lens element, and R32 is the radius of curvature of the image side surface of the third lens element.
CN202210768321.0A 2022-07-01 2022-07-01 Wide-angle lens Pending CN117369098A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210768321.0A CN117369098A (en) 2022-07-01 2022-07-01 Wide-angle lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210768321.0A CN117369098A (en) 2022-07-01 2022-07-01 Wide-angle lens

Publications (1)

Publication Number Publication Date
CN117369098A true CN117369098A (en) 2024-01-09

Family

ID=89387903

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210768321.0A Pending CN117369098A (en) 2022-07-01 2022-07-01 Wide-angle lens

Country Status (1)

Country Link
CN (1) CN117369098A (en)

Similar Documents

Publication Publication Date Title
CN107132643B (en) Wide-angle lens
CN111077639B (en) Imaging lens
CN111722356B (en) Imaging lens
US10955645B2 (en) Wide-angle lens assembly
TW202036070A (en) Lens assembly
US11698512B2 (en) Wide-angle lens assembly
CN112462485B (en) Imaging lens
CN112946860B (en) Wide-angle lens
TWI749970B (en) Wide-angle lens assembly
CN117369098A (en) Wide-angle lens
TWI716870B (en) Lens assembly
TWI835185B (en) Wide-angle lens assembly
CN114442262B (en) Imaging lens
TWI805340B (en) Wide-angle lens assembly
TWI805073B (en) Wide-angle lens assembly
TWI832263B (en) Wide-angle lens assembly
TW202403377A (en) Wide-angle lens assembly
TWI786810B (en) Wide-angle lens assembly
TWI736462B (en) Lens assembly
TWI722559B (en) Lens assembly
TWI815459B (en) Lens assembly
TWI792202B (en) Lens assembly
TW202319800A (en) Wide-angle lens assembly
CN111929805A (en) Imaging lens
CN116990941A (en) Wide-angle lens

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination