CN111007638B - Single-chip optical lens with small image surface - Google Patents
Single-chip optical lens with small image surface Download PDFInfo
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- CN111007638B CN111007638B CN201911356295.5A CN201911356295A CN111007638B CN 111007638 B CN111007638 B CN 111007638B CN 201911356295 A CN201911356295 A CN 201911356295A CN 111007638 B CN111007638 B CN 111007638B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 93
- 238000003384 imaging method Methods 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims 1
- 230000004075 alteration Effects 0.000 description 8
- 201000009310 astigmatism Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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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
- G02B13/0025—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 one lens only
-
- 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
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention relates to a single-chip optical lens with a small image surface, which sequentially comprises the following components from an object side to an image side along an optical axis: the diaphragm and the lens are characterized in that: the image side surface of the lens is a convex surface, at least one of the two surfaces of the lens is an aspheric surface, and the lens has positive refractive power. The diaphragm is located between the lens and the object. And the optical lens satisfies the conditions: IH <0.45mm where IH is half image height, and conditions 3.6> TTL/IH >3.0, | R2/T3| -0.55, where TTL represents the distance of the diaphragm to the image plane; IH is half of the image height of the imaging, namely half image height; where R2 is the radius of curvature of the image-side surface of the lens and T3 is the distance from the image-side surface of the lens to the image plane, where the radius of the image height and the distance from plane to plane are both in millimeters.
Description
Technical Field
The application relates to the field of optical lenses, in particular to a single-chip optical lens with a small image plane, which is often applied to mobile phones and some medical instruments due to the characteristics of simple structure and high reliability.
Background
With the continuous development of high-tech products, people live with more and more demands on lenses, and for example, single-lens lenses can find an application example in various cameras and medical probes used in mobile phones. In the application of the single lens technology, the development of the portable electronic products is gradually towards ultra-thin miniaturization and smaller imaging surface. This puts increasing demands on the performance of the lens, and needs to satisfy the demands of small image plane size and wider field angle as well as miniaturization.
Disclosure of Invention
The application provides a lens which can realize that light is converged on a smaller image plane by using a lens with an aspheric surface, so that the optical lens can be matched with a chip with a smaller size, thereby realizing the miniaturization of the lens and reducing the influence of distortion.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a small-image-plane monolithic optical lens, comprising, in order from an object side to an image side along an optical axis: diaphragm, lens, image plane. The diaphragm is located between the lens and the object, the object side surface of the lens can be a convex surface or a concave surface, the image side surface of the lens is a convex surface, at least one of the two surfaces of the lens is an aspheric surface, and the lens has positive refractive power. And the optics via the lens satisfy the following conditions:
3.6>TTL/IH>3.0
|R2/T3|＝0.55
TTL denotes a distance from the stop of the optical lens to the image plane of the optical lens among the above formulas. IH is half the height of the image imaged by the optical lens. Among the above formulas, R2 is the radius of curvature of the image-side surface of the lens, and T3 is the distance of the image-side surface of the lens from the image plane, where the units of the image height radius and the plane-to-plane distance are both millimeters.
In an optical lens in one embodiment, a half-image height H of the lens satisfies a condition: IH <0.45 mm.
In an optical lens in one embodiment, distortion of the lens satisfies a condition: distortion < 5%, where distortion is optical distortion.
Among optical lens conditions in one embodiment, the optical lens satisfies an optical distortion that satisfies the condition: 1.6> | dis | >0.7, where dis is the ratio of optical distortion to TV distortion.
In another aspect, the present application provides an optical lens of a small imaging range combined by a single lens and a stop, the lens comprising, in order from an object side to an image side along an optical axis: diaphragm, lens, image plane. The diaphragm is located between the lens and the object, the object side surface of the lens can be a convex surface or a concave surface, the image side surface of the lens is a convex surface, at least one of the two surfaces of the lens is an aspheric surface, and the lens has positive refractive power. Wherein the following conditions are satisfied:
100°>FOV>80°
wherein FOV represents the range of the optical lens field angle among the above formulas.
The invention has the advantages that:
the invention adopts a single lens, and at least one gain effect of the optical lens, such as smaller image plane, larger FOV and miniaturization, is achieved by adjusting the curvature of two surfaces of the lens, the surface shape, the distance between the diaphragm and the lens and the distance between the lens and the image plane.
Drawings
Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural diagram of an optical lens according to embodiment 1 of the present application.
Fig. 2A is an astigmatism graph of the optical lens of embodiment 1.
Fig. 2B is a distortion graph of the optical lens of embodiment 1.
Fig. 2C is a vertical axis chromatic aberration graph of the optical lens of embodiment 1.
Fig. 3 is a schematic structural diagram of an optical lens according to embodiment 2 of the present application.
Fig. 4A is an astigmatism graph of the optical lens of embodiment 2.
Fig. 4B is a distortion graph of the optical lens of embodiment 2.
Fig. 4C is a vertical axis chromatic aberration graph of the optical lens of embodiment 2.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these illustrations are merely descriptions of exemplary nature of the present application and are not intended to limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
In the drawings, spherical and aspherical shapes are provided by way of example in the present application for better illustration. The expression spherical and aspherical shape should not be limited to the given examples. The figures are purely diagrammatic and not drawn to scale.
In the present application, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the image plane is called the image side surface.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The features, principles, and other aspects of the present application are described in detail below.
A lens barrel according to an exemplary embodiment of the present application includes a piece of lens and a diaphragm, the diaphragm and the piece of lens being respectively disposed along an optical axis and the diaphragm being disposed between an object and the lens.
In embodiments, the lens and the stop may be changed, but still remain with the stop between the object and the lens.
In an exemplary embodiment, the object side surface of the lens may be a convex surface or a concave surface.
In an exemplary embodiment, the image side surface of the lens is a convex surface.
In an exemplary embodiment, at least one of the two surfaces of the lens is aspheric.
In the exemplary embodiment, the lens conforms to the relationship | R2/T3| -0.55 between the curvature radius R2 of the image side surface of the lens and the distance T3 from the image side surface of the lens to the image plane, and the lens satisfies the above conditions, which is beneficial to improving the performance of the optical lens and reducing the influence of optical distortion.
In an exemplary embodiment, an optical lens of the present application may satisfy the conditional expression 3.6> TTL/IH > 3.0. TTL denotes a distance from the stop of the optical lens to the image plane of the optical lens among the above formulas. IH is half the height of the image imaged by the optical lens. The condition is satisfied, and the imaging range of the lens is further reduced on the premise of ensuring the optical performance.
In an exemplary embodiment, the present application may conform to the conditional expression 1.6> dis >0.7, where dis is the ratio of optical distortion to TV distortion. After the conditions are met, the optical performance of the optical lens in aberration can be improved, and miniaturization is realized on the premise that the field angle is not changed.
Optionally, the optical lens may further include a protective glass for protecting the photosensitive element on the image plane, in which a filter for correcting color deviation may be included.
The optical lens according to the above-described embodiment of the present application employs a single-piece lens. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the on-axis distance between the lens and the diaphragm and the like, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the optical lens is more beneficial to production and processing and can be suitable for portable electronic products.
In the embodiment of the present application, both side mirror surfaces of the lens are aspherical mirror surfaces. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.
Example 1
An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1, 2A, 2B, and 2C. Fig. 1 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present application.
As shown in fig. 1, an optical lens according to an exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: stop, lens E1, and image plane s 4.
Lens E1 has positive power, with object side S1 being concave and image side S2 being convex; light from the object sequentially passes through the stop plane from surfaces S1 to S3 and is finally imaged on the imaging plane S4.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical lens of example 1, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 1
As can be seen from table 1, both the object-side surface and the image-side surface of the lens are aspheric. In the present embodiment, the profile x of each aspheric lens can be defined using, but not limited to, the following aspheric formula:
wherein x is the rise of the distance from the aspheric surface vertex 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, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below gives the high-order coefficient coefficients A4, A6, A8, A10, A12, A14 and A16 that can be used for each of the aspherical mirrors S2-S3 in example 1.
TABLE 2
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S2 | 0.94E-03 | -0.55E-03 | 0.35E-03 | -2.95E-05 | 5.12E-19 | 3.56E-19 | 4.74E-20 |
| S3 | -0.17E-0 | 0.26E-01 | -0.71E-02 | 0.19E-02 | -0.50E-03 | 0.16E-03 | -5.62E-07 |
Table 3 gives the total optical length TTL (i.e., the distance on the optical axis from the stop to the imaging surface S4), the optical distortion, the half image height IH, and the FOV of the optical lens in embodiment 1.
TABLE 3
| Distortion | 4.2％ | TTL(mm) | 1.43mm |
| Tv-distortion | -2.7％ | ||
| IH | 0.4mm | ||
| FOV | 90° |
The optical lens in embodiment 1 satisfies:
TTL/IH is 3.56, where TTL denotes a distance from a stop of the optical lens to an image plane of the optical lens. IH is half of the image height imaged by the optical lens, i.e. half of the image height.
I R2/T3|, where R2 is the radius of curvature of the image-side surface of the lens and T3 is the distance from the image-side surface of the lens to the image plane, is 0.55.
1.56, where dis is the ratio of the optical distortion to the TV distortion.
The FOV is 90 °, where FOV denotes the optical lens field angle.
In addition, fig. 2A shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical lens of embodiment 1. Fig. 2B shows a distortion curve of the optical lens of embodiment 1, which represents the distortion magnitude values in the case of different angles of view. Fig. 2C shows a vertical axis chromatic aberration curve of the optical lens of embodiment 1, which represents a deviation of different image heights on an image plane after light passes through the lens. As can be seen from fig. 2A to 2C, the optical lens according to embodiment 1 can achieve a smaller imaging range and maintain a certain imaging quality.
Example 2
An optical lens according to embodiment 2 of the present application is described below with reference to fig. 3. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.
As shown in fig. 3, an optical lens according to an exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, includes: stop, lens E1, and image plane s 4.
Lens E1 has positive power, with object side S1 being concave and image side S2 being convex; light from the object sequentially passes through the stop plane from surfaces S1 to S3 and is finally imaged on the imaging plane S4.
Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical lens of example 2, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
TABLE 4
As can be seen from table 4, in example 2, both the object-side surface and the image-side surface of the lens were aspherical surfaces. Table 5 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 5
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S2 | 0.18E-01 | -0.12E-02 | -0.16E-03 | -0.17E-03 | 2.17E-13 | -2.15E-15 | 1.41E-18 |
| S3 | -0.21E-0 | 0.33E-01 | -0.64E-02 | 0.27E-02 | -0.67E-03 | 0.22E-03 | -1.63E-05 |
Table 6 shows the total optical length TTL (i.e., the distance on the optical axis from the stop to the imaging surface S4), the optical distortion, the half image height IH, and the FOV of the optical lens in embodiment 2.
TABLE 6
| Distortion | 2.9％ | TTL(mm) | 1.36mm |
| Tv-distortion | -3.7％ | ||
| IH | 0.45mm | ||
| FOV | 90° |
Fig. 4A shows astigmatism curves representing meridional field curvature and sagittal field curvature of the optical lens of embodiment 2. Fig. 4B shows a distortion curve of the optical lens of embodiment 2, which represents the distortion magnitude values in the case of different viewing angles. Fig. 4C shows a vertical axis chromatic aberration curve of the optical lens of embodiment 2, which represents a deviation of different image heights on the image plane after the light passes through the lens. As can be seen from fig. 4A to 4C, the optical lens according to embodiment 2 can achieve a smaller imaging range and maintain a certain imaging quality.
Claims (5)
1. A small image plane single-chip optical lens sequentially comprises the following components from an object side to an image side along an optical axis: a diaphragm and a lens; it is characterized in that the preparation method is characterized in that,
the surface of the image side of the lens is a convex surface, at least one surface of the two surfaces of the lens is an aspheric surface, and the lens has positive refractive power; the diaphragm is positioned between the lens and the object; and the optical lens satisfies the following conditions:
3.6>TTL/IH>3.0
|R2/T3|＝0.55
in the formula, TTL represents the distance from the diaphragm to the image plane; IH is half of the image height of the imaging, namely half image height; wherein R2 is the curvature radius of the image side surface of the lens, and T3 is the distance from the image side surface of the lens to the image plane; where the units of image height, radius of curvature and face-to-face distance are in millimeters.
2. The small-image-plane single-lens optical lens according to claim 1, wherein the field angle FOV of the optical lens satisfies the condition: 100 ° > FOV >80 °.
3. The small image plane single-chip optical lens as claimed in claim 1, wherein the half-image height IH of the optical lens satisfies the condition: IH <0.45 mm.
4. The small image plane single-chip optical lens as claimed in claim 1, wherein the distortion of the lens satisfies the condition: distortion < 5%, where distortion is optical distortion.
5. The monolithic optical lens with small image plane as claimed in claim 3, wherein the optical lens satisfies the optical distortion condition: 1.6> | dis | >0.7, where dis is the ratio of optical distortion to TV distortion.
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| CN101313240A (en) * | 2006-12-07 | 2008-11-26 | 里程碑株式会社 | camera lens |
| CN101354473A (en) * | 2007-07-24 | 2009-01-28 | 凤凰光学(广东)有限公司 | Camera lens |
| CN102460265A (en) * | 2009-06-11 | 2012-05-16 | 数字光学(东部)公司 | Lenses and their applications |
| CN106707470A (en) * | 2016-11-04 | 2017-05-24 | 瑞声声学科技(深圳)有限公司 | Camera lens |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007322839A (en) * | 2006-06-01 | 2007-12-13 | Fu Tech Kk | Imaging lens and personal digital assistant |
| KR100950506B1 (en) * | 2008-01-18 | 2010-03-31 | 삼성테크윈 주식회사 | Optical imaging system for cameras and video communication cameras using the same |
| KR20090111133A (en) * | 2008-04-21 | 2009-10-26 | 주식회사 코렌 | Photographing lens optical system |
| CN105511078B (en) * | 2015-12-31 | 2018-02-16 | 北京小鸟看看科技有限公司 | A kind of eyepiece camera lens, wear display optical system and helmet |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101313240A (en) * | 2006-12-07 | 2008-11-26 | 里程碑株式会社 | camera lens |
| CN101354473A (en) * | 2007-07-24 | 2009-01-28 | 凤凰光学(广东)有限公司 | Camera lens |
| CN102460265A (en) * | 2009-06-11 | 2012-05-16 | 数字光学(东部)公司 | Lenses and their applications |
| CN106707470A (en) * | 2016-11-04 | 2017-05-24 | 瑞声声学科技(深圳)有限公司 | Camera lens |
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Denomination of invention: A Monolithic Optical Lens with Small Image Plane Effective date of registration: 20220929 Granted publication date: 20220201 Pledgee: China Construction Bank Corporation Panjin branch Pledgor: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Registration number: Y2022210000157 |