CN109100851B - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN109100851B CN109100851B CN201710474546.4A CN201710474546A CN109100851B CN 109100851 B CN109100851 B CN 109100851B CN 201710474546 A CN201710474546 A CN 201710474546A CN 109100851 B CN109100851 B CN 109100851B
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- 238000003384 imaging method Methods 0.000 description 21
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- 238000010586 diagram Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
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- 230000009977 dual effect Effects 0.000 description 2
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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
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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
- G02B13/0055—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
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Abstract
The present application discloses an optical lens, sequentially from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has negative focal power, and both the object side surface and the image side surface of the third lens are concave surfaces; the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; and the fifth lens has positive optical power.
Description
Technical Field
The present application relates to an optical lens, and more particularly, to an optical lens including five lenses.
Background
At present, the field of vision needs to be expanded in more and more fields, and particularly, under the condition of severe environment, the lens needs to be used for replacing human eyes to perform image acquisition work and analysis work, so that the stability of performance of the lens under different temperature conditions is particularly important. For example, in the application of the vehicle-mounted lens, since the vehicle needs to be used under different temperature conditions, high requirements are made on the stability of the performance of the lens in various natural environments.
With the development of scientific technology, new scientific technologies such as unmanned driving and the like are more and more popularized, and the requirements on distance measurement and other lenses are also more and more increased. The general vehicle-mounted lens has a relatively large CRA (angle of incidence of principal ray to the photosensitive element), and the temperature range of the vehicle is relatively large. When the automobile is used at different temperatures, the focus of the lens can be shifted due to the change of the temperature, so that the position of the light incident on the photosensitive element is shifted, and the accuracy of a test result is influenced.
In addition, although there are systems using dual lenses for object distance testing in the market, the overall cost of the dual lenses is high, and both the systems and algorithms are complex.
Disclosure of Invention
The present application provides an optical lens applicable to an in-vehicle lens that may overcome, at least in part, at least one of the above-mentioned disadvantages of the prior art.
The present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens element can have negative focal power, and the object-side surface can be a convex surface and the image-side surface can be a concave surface; the second lens can have positive focal power, and the object side surface of the second lens can be a concave surface, and the image side surface of the second lens can be a convex surface; the third lens can have negative focal power, and both the object side surface and the image side surface of the third lens can be concave; the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens can be convex surfaces; and the fifth lens may have a positive optical power.
The present application further provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens and the third lens can both have negative focal power; the second lens, the fourth lens, and the fifth lens may each have a positive optical power. The object side surface of the fourth lens element can be convex, the image side surface can be convex, and the focal length value f4 and the total focal length value f of the optical lens can satisfy the condition that f4/f is more than or equal to 0.2 and less than or equal to 3.5.
The present application further provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens and the third lens can both have negative focal power; the second lens, the fourth lens, and the fifth lens may each have a positive optical power. The focal length value f5 of the fifth lens element and the total focal length value f of the optical lens can satisfy 1 ≤ f5/f ≤ 8.
The present application further provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens may have a negative optical power; the second lens can have positive focal power, and the object side surface of the second lens can be a concave surface, and the image side surface of the second lens can be a convex surface; the third lens can have negative focal power, and both the object side surface and the image side surface of the third lens can be concave; the fourth lens and the fifth lens may each have a positive optical power. The distance T23 between the second lens and the third lens on the optical axis and the total focal length f of the optical lens can satisfy 0.1-3T 23/f.
In one embodiment, the object-side surface of the first lens element can be convex and the image-side surface can be concave.
In one embodiment, the object-side surface of the second lens element can be concave and the image-side surface can be convex.
In one embodiment, the object side surface of the third lens element can be concave and the image side surface can be concave.
In one embodiment, the object-side surface of the fourth lens element can be convex, and the image-side surface can be convex.
In one embodiment, the object side surface of the fifth lens may be convex. Optionally, the image-side surface of the fifth lens element may be convex. Alternatively, the image side surface of the fifth lens may be concave.
In one embodiment, the third lens and the fourth lens may be cemented to form a cemented lens.
In one embodiment, the focal length value f4 of the fourth lens and the total focal length value f of the optical lens can satisfy 0.2 ≦ f4/f ≦ 3.5.
In one embodiment, the focal length value f5 of the fifth lens and the total focal length value f of the optical lens can satisfy 1 ≦ f5/f ≦ 8.
In one embodiment, the separation distance T23 between the second lens and the third lens on the optical axis and the total focal length value f of the optical lens can satisfy 0.1 ≦ T23/f ≦ 3.
The multi-lens (for example, five lenses) are adopted, and through the reasonable design of the fourth lens and the fifth lens which are positioned at the rear end of the lens, light can be stably transited and finally approximately vertically enters the surface of the photosensitive element on the imaging surface, so that the influence of focal distance deviation caused by temperature on the imaging position is eliminated.
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. In the drawings:
fig. 1 is a schematic view showing a structure of an optical lens according to embodiment 1 of the present application;
fig. 2 is a schematic structural view showing an optical lens according to embodiment 2 of the present application;
fig. 3 is a schematic structural view showing an optical lens according to embodiment 3 of the present application;
fig. 4 is a schematic view showing a structure of an optical lens according to embodiment 4 of the present application.
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 the detailed description is merely illustrative of exemplary embodiments of the present application and does not 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.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
Herein, 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.
An optical lens according to an exemplary embodiment of the present application includes, for example, five lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in order from the object side to the image side along the optical axis. The optical lens can further comprise a photosensitive element arranged on the imaging surface.
The first lens element can have a negative power, and can have a convex object-side surface and a concave image-side surface. The first lens is arranged as a meniscus lens with the convex surface facing the object side, which is beneficial to collect light rays with a large field of view as much as possible and enable the collected light rays to smoothly enter the rear optical system.
The second lens element can have a positive power, and can have a concave object-side surface and a convex image-side surface. The second lens can compress the light collected by the first lens, so that the light trend is smoothly transited.
Optionally, a diaphragm for limiting the light beam may be disposed between the second lens and the third lens to improve the imaging quality of the lens. The diaphragm is arranged between the second lens and the third lens, so that the front and the rear light rays can be collected, the optical total length of the system is shortened, and the calibers of the front and the rear lens groups are favorably reduced. It should be understood by those skilled in the art that the stop may be disposed between the object side and the first lens, between the lenses, or between the fifth lens and the image side as needed, i.e., the disposition of the stop should not be limited to between the second lens and the third lens.
The third lens element can have a negative optical power, and can have a concave object-side surface and a concave image-side surface. The third lens is used for diverging the light rays, so that the light rays compressed by the diaphragm smoothly enter the rear optical system. Meanwhile, the third lens can also balance spherical aberration and positional chromatic aberration introduced by the first lens and the second lens.
The distance T23 between the second lens and the third lens on the optical axis and the total focal length f of the optical lens can satisfy 0.1-3T 23/f, and further, T23 and f can satisfy 1.26-2.24T 23/f, so as to separate the distance between the diaphragm and the second lens and the distance between the diaphragm and the third lens, thereby enabling the light to smoothly pass through the diaphragm.
The fourth lens element can have a positive power, and can have a convex object-side surface and a convex image-side surface. The fourth lens is used for converging light rays, and converging the light rays diverged by the third lens, so that the light ray direction is approximately consistent with the optical axis direction, and the angle of the light rays incident on the photosensitive element on the imaging surface is reduced.
The fifth lens element may have a positive optical power and the object-side surface thereof may be convex. In some embodiments, the image-side surface of the fifth lens element can be convex. In other embodiments, the image-side surface of the fifth lens element can be concave. The fifth lens is used for further converging the light rays so as to further adjust the angle of the light rays on the basis of the fourth lens and reduce the angle of the light rays incident on the photosensitive element on the imaging surface. The light adjusted by the fifth lens can be approximately vertically incident to the photosensitive element on the imaging surface, so that the influence of the focal length change caused by temperature on the imaging position of the lens is eliminated.
In order to reduce the angle of incidence of light rays on the photosensitive element on the imaging surface, the focal length value f4 of the fourth lens and the focal length value f5 of the fifth lens need to be reasonably configured, and f4 and f5 are further matched with each other, so that the light rays are finally approximately perpendicularly incident on the photosensitive element on the imaging surface, and the influence of the focal length change caused by temperature on the imaging position of the lens is eliminated. In the embodiment of the present application, a focal length value f4 of the fourth lens and a total focal length value f of the optical lens may satisfy 0.2 ≦ f4/f ≦ 3.5, and more specifically, f4 and f may further satisfy 1.14 ≦ f4/f ≦ 1.68. And a focal length value f5 of the fifth lens and a total focal length value f of the optical lens may satisfy 1. ltoreq. f 5/f. ltoreq.8, and more specifically, f5 and f may further satisfy 3.06. ltoreq. f 5/f. ltoreq.4.69.
In an exemplary embodiment, the third lens and the fourth lens may be combined into a cemented lens by cementing the image-side surface of the third lens with the object-side surface of the fourth lens. By gluing the third lens and the fourth lens, the chromatic aberration of the system can be further eliminated.
The optical lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. Through the reasonable design of the fourth lens and the fifth lens which are positioned at the rear end of the lens, light rays can be in stable transition and are finally approximately close to the surface of the photosensitive element on the vertical incidence imaging surface, so that the influence of focal distance deviation on the imaging position is eliminated, and the accuracy of a distance test result is further kept. In addition, the single lens system according to the embodiment of the application can replace a double lens system used for carrying out object distance testing in the market at present, and is favorable for reducing the cost.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the optical lens is not limited to include five lenses. The optical lens may also include other numbers of lenses, if desired.
Specific examples of an optical lens applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1. Fig. 1 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present application.
As shown in fig. 1, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an image plane S14.
The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave.
The second lens L2 is a meniscus lens with positive power, with the object side S3 being concave and the image side S4 being convex.
The third lens L3 is a biconcave lens with negative power, and has a concave object-side surface S6 and a concave image-side surface S7.
The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9.
The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S10 and a convex image-side surface S11.
Alternatively, the optical lens may include a color filter L6 having an object side S12 and an image side S13. Optionally, the optical lens may further include a protective glass disposed between the fifth lens L5 and the image side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S13 and is finally imaged on the imaging surface S14.
In the optical lens of the present embodiment, a stop STO may be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality.
Table 1 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 1.
| Flour mark | Radius of curvature R (mm) | Thickness T (mm) | Refractive index Nd | Abbe number Vd |
| S1 | 12.5680 | 1.0200 | 1.79 | 47.51 |
| S2 | 4.1000 | 1.2000 | ||
| S3 | -20.2800 | 2.5200 | 1.85 | 23.79 |
| S4 | -7.3700 | 3.7100 | ||
| STO | Infinity | 1.6500 | ||
| S6 | -19.1840 | 1.5400 | 1.92 | 18.90 |
| S7 | 8.0300 | 0.2100 | ||
| S8 | 12.1650 | 2.9400 | 1.80 | 46.57 |
| S9 | -5.3730 | 0.0800 | ||
| S10 | 9.5410 | 1.9800 | 1.65 | 58.42 |
| S11 | -30.0000 | 2.4024 | ||
| S12 | Infinity | 0.4000 | 1.52 | 58.57 |
| S13 | Infinity | 2.8033 | ||
| S14 | Infinity |
TABLE 1
In the present embodiment, the focal length value f4 of the fourth lens L4 is 5.01 mm; the focal length value f5 of the fifth lens L5 is 11.33 mm; the total focal length value f of the optical lens is 3.71 mm; the second lens L2 and the third lens L3 are separated by a distance T23 of 5.36mm on the optical axis.
F4/f is equal to 1.35 between the focal length value f4 of the fourth lens L4 and the total focal length value f of the optical lens; f5/f is 3.06 between the focal length value f5 of the fifth lens L5 and the total focal length value f of the optical lens; the second lens L2 and the third lens L3 satisfy T23/f of 1.45 between the separation distance T23 on the optical axis and the total focal length value f of the optical lens.
Example 2
An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. 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. 2 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.
As shown in fig. 2, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an image plane S14.
The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave.
The second lens L2 is a meniscus lens with positive power, with the object side S3 being concave and the image side S4 being convex.
The third lens L3 is a biconcave lens with negative power, and has a concave object-side surface S6 and a concave image-side surface S7.
The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9.
The fifth lens L5 is a meniscus lens with positive power, with the object side S10 being convex and the image side S11 being concave.
Alternatively, the optical lens may include a color filter L6 having an object side S12 and an image side S13. Optionally, the optical lens may further include a protective glass disposed between the fifth lens L5 and the image side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S13 and is finally imaged on the imaging surface S14.
In the optical lens of the present embodiment, a stop STO may be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality.
Table 2 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 2.
| Flour mark | Radius of curvature R (mm) | Thickness T (mm) | Refractive index Nd | Abbe number Vd |
| S1 | 14.6158 | 1.0200 | 1.79 | 47.51 |
| S2 | 3.9640 | 1.2000 | ||
| S3 | -19.7618 | 3.3167 | 1.85 | 23.79 |
| S4 | -7.4567 | 3.7100 | ||
| STO | Infinity | 1.6500 | ||
| S6 | -21.1688 | 1.6664 | 1.92 | 20.88 |
| S7 | 8.1188 | 0.2100 | ||
| S8 | 11.7032 | 2.4577 | 1.80 | 46.57 |
| S9 | -5.2655 | 0.0800 | ||
| S10 | 10.0000 | 2.4696 | 1.65 | 58.42 |
| S11 | 39.1617 | 2.6332 | ||
| S12 | Infinity | 0.4000 | 1.52 | 58.57 |
| S13 | Infinity | 3.5422 | ||
| S14 | Infinity |
TABLE 2
In the present embodiment, the focal length value f4 of the fourth lens L4 is 4.83 mm; the focal length value f5 of the fifth lens L5 is 19.94 mm; the total focal length value f of the optical lens is 4.25 mm; the second lens L2 and the third lens L3 are separated by a distance T23 of 5.36mm on the optical axis.
Example 3
An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. Fig. 3 shows a schematic structural diagram of an optical lens according to embodiment 3 of the present application.
As shown in fig. 3, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an image plane S13.
The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave.
The second lens L2 is a meniscus lens with positive power, with the object side S3 being concave and the image side S4 being convex.
The third lens L3 is a biconcave lens with negative power, and has a concave object-side surface S6 and a concave image-side surface S7. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The third lens L3 and the fourth lens L4 are cemented to constitute a cemented lens.
The fifth lens L5 is a meniscus lens with positive power, with the object side S9 being convex and the image side S10 being concave.
Alternatively, the optical lens may include a color filter L6 having an object side S11 and an image side S12. Optionally, the optical lens may further include a protective glass disposed between the fifth lens L5 and the image side surface S13. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In the optical lens of the present embodiment, a stop STO may be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality.
Table 3 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 3.
| Flour mark | Radius of curvature R (mm) | Thickness T (mm) | Refractive index Nd | Abbe number Vd |
| S1 | 60.1823 | 1.0200 | 1.79 | 47.51 |
| S2 | 3.6386 | 1.2000 | ||
| S3 | -18.9235 | 3.3167 | 1.85 | 23.79 |
| S4 | -7.4351 | 3.7100 | ||
| STO | Infinity | 1.6500 | ||
| S6 | -28.0156 | 1.6664 | 1.92 | 18.90 |
| S7 | 6.2995 | 2.4577 | 1.80 | 46.57 |
| S8 | -5.8487 | 0.0800 | ||
| S9 | 6.9056 | 2.6050 | 1.65 | 58.42 |
| S10 | 32.7003 | 2.7162 | ||
| S11 | Infinity | 0.4000 | 1.52 | 58.57 |
| S12 | Infinity | 2.1305 | ||
| S13 | Infinity |
TABLE 3
In the present embodiment, the focal length value f4 of the fourth lens L4 is 4.15 mm; the focal length value f5 of the fifth lens L5 is 12.92 mm; the total focal length value f of the optical lens is 2.90 mm; the second lens L2 and the third lens L3 are separated by a distance T23 of 5.36mm on the optical axis.
Example 4
An optical lens according to embodiment 4 of the present application is described below with reference to fig. 4. Fig. 4 shows a schematic structural diagram of an optical lens according to embodiment 4 of the present application.
As shown in fig. 4, the optical lens includes, in order from an object side to an image side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an image plane S13.
The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave.
The second lens L2 is a meniscus lens with positive power, with the object side S3 being concave and the image side S4 being convex.
The third lens L3 is a biconcave lens with negative power, and has a concave object-side surface S6 and a concave image-side surface S7. The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The third lens L3 and the fourth lens L4 are cemented to constitute a cemented lens.
The fifth lens element L5 is a biconvex lens with positive power, and has a convex object-side surface S9 and a convex image-side surface S10.
Alternatively, the optical lens may include a color filter L6 having an object side S11 and an image side S12. Optionally, the optical lens may further include a protective glass disposed between the fifth lens L5 and the image side surface S13. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In the optical lens of the present embodiment, a stop STO may be provided between, for example, the second lens L2 and the third lens L3 to improve the imaging quality.
Table 4 shows the radius of curvature R, thickness T, refractive index Nd, and abbe number Vd of each lens of the optical lens of example 4.
TABLE 4
In the present embodiment, the focal length value f4 of the fourth lens L4 is 4.01 mm; the focal length value f5 of the fifth lens L5 is 8.98 mm; the total focal length value f of the optical lens is 2.39 mm; the second lens L2 and the third lens L3 are separated by a distance T23 of 5.36mm on the optical axis.
In summary, examples 1 to 4 each satisfy the relationship shown in table 5 below.
| Conditional expression (A) example | 1 | 2 | 3 | 4 |
| f4/f | 1.35 | 1.14 | 1.43 | 1.68 |
| f5/f | 3.06 | 4.69 | 4.46 | 3.75 |
| T23/f | 1.45 | 1.26 | 1.85 | 2.24 |
TABLE 5
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (25)
1. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens,
it is characterized in that the preparation method is characterized in that,
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has negative focal power, and both the object side surface and the image side surface of the third lens are concave;
the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; and
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;
the number of the lenses with focal power in the optical lens is five;
the focal length value f5 of the fifth lens and the total focal length value f of the optical lens satisfy 1 ≤ f5/f ≤ 8.
2. An optical lens according to claim 1, wherein the third lens and the fourth lens are cemented to form a cemented lens.
3. An optical lens according to claim 1 or 2, characterized in that the focal length value f4 of the fourth lens and the total focal length value f of the optical lens satisfy 0.2 ≦ f4/f ≦ 3.5.
4. An optical lens according to claim 1 or 2, wherein a separation distance T23 between the second lens and the third lens on the optical axis and a total focal length value f of the optical lens satisfy 0.1 ≦ T23/f ≦ 3.
5. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens,
it is characterized in that the preparation method is characterized in that,
the first lens and the third lens both have negative focal power;
the second lens, the fourth lens and the fifth lens each have positive optical power;
the number of the lenses with focal power in the optical lens is five;
the object side surface of the fourth lens is a convex surface, the image side surface of the fourth lens is a convex surface, and the focal length value f4 of the fourth lens and the total focal length value f of the optical lens meet the condition that f4/f is more than or equal to 1.14 and less than or equal to 3.5; and
the focal length value f5 of the fifth lens and the total focal length value f of the optical lens satisfy 1 ≤ f5/f ≤ 8.
6. An optical lens according to claim 5,
the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; and
the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface.
7. An optical lens barrel according to claim 5, wherein the object side surface of the fifth lens element is convex.
8. An optical lens barrel according to claim 7, wherein the image side surface of the fifth lens element is convex.
9. An optical lens barrel according to claim 7, wherein the image side surface of the fifth lens element is concave.
10. An optical lens barrel according to claim 6, wherein the object side surface and the image side surface of the third lens are both concave.
11. An optical lens according to claim 10, wherein the third lens and the fourth lens are cemented to form a cemented lens.
12. An optical lens according to claim 5, wherein a separation distance T23 between the second lens and the third lens on the optical axis and a total focal length value f of the optical lens satisfy 0.1 ≦ T23/f ≦ 3.
13. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens,
it is characterized in that the preparation method is characterized in that,
the first lens and the third lens both have negative focal power;
the second lens, the fourth lens and the fifth lens each have positive optical power;
the number of the lenses with focal power in the optical lens is five;
the focal length value f5 of the fifth lens and the total focal length value f of the optical lens meet the condition that f5/f is more than or equal to 3.06 and less than or equal to 8.
14. An optical lens according to claim 13, wherein the focal length value f4 of the fourth lens and the total focal length value f of the optical lens satisfy 0.2 ≦ f4/f ≦ 3.5.
15. An optical lens barrel according to claim 13, wherein the object side surface of the fifth lens element is convex.
16. An optical lens barrel according to claim 15, wherein the image side surface of the fifth lens element is convex.
17. An optical lens barrel according to claim 15, wherein the image side surface of the fifth lens element is concave.
18. An optical lens according to claim 16 or 17,
the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the object side surface and the image side surface of the third lens are both concave surfaces;
the object side surface and the image side surface of the fourth lens are convex surfaces.
19. An optical lens according to claim 18, wherein the third lens and the fourth lens are cemented to form a cemented lens.
20. An optical lens according to claim 19, wherein a separation distance T23 between the second lens and the third lens on the optical axis and a total focal length value f of the optical lens satisfy 0.1 ≦ T23/f ≦ 3.
21. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens,
it is characterized in that the preparation method is characterized in that,
the first lens has a negative optical power;
the second lens has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has negative focal power, and both the object side surface and the image side surface of the third lens are concave;
the fourth lens and the fifth lens each have a positive optical power,
the number of the lenses with focal power in the optical lens is five;
the separation distance T23 between the second lens and the third lens on the optical axis and the total focal length f of the optical lens satisfy 0.1-3T 23/f;
the focal length value f5 of the fifth lens and the total focal length value f of the optical lens meet the condition that f5/f is more than or equal to 3.06 and less than or equal to 8.
22. An optical lens barrel according to claim 21, wherein the object-side surface and the image-side surface of the fourth lens element are convex, and the focal length f4 and the total focal length f of the optical lens barrel satisfy 0.2 ≦ f4/f ≦ 3.5.
23. An optical lens barrel according to claim 21, wherein the first lens element has a convex object-side surface and a concave image-side surface.
24. An optical lens barrel according to claim 21, wherein the object side surface of the fifth lens element is convex.
25. An optical lens according to claim 22, wherein the third lens and the fourth lens are cemented to form a cemented lens.
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| CN201710474546.4A CN109100851B (en) | 2017-06-21 | 2017-06-21 | Optical lens |
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| CN112684590B (en) | 2021-01-20 | 2023-03-21 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114384669B (en) * | 2021-12-31 | 2024-08-09 | 福建福光天瞳光学有限公司 | Infrared imaging lens and imaging method thereof |
| CN116243463B (en) * | 2023-03-01 | 2025-05-23 | 常州星宇车灯股份有限公司 | Imaging lens and signal projection lamp using same |
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|---|---|---|---|---|
| CN1403844A (en) * | 2001-08-24 | 2003-03-19 | 佳能株式会社 | Lens system and camera with the same system |
| CN101923204A (en) * | 2009-06-16 | 2010-12-22 | 鸿富锦精密工业（深圳）有限公司 | Projection lens |
| CN106353875A (en) * | 2015-07-15 | 2017-01-25 | 先进光电科技股份有限公司 | Optical imaging system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11142730A (en) * | 1997-09-04 | 1999-05-28 | Konica Corp | Image pickup lens |
| JPH11242155A (en) * | 1998-02-25 | 1999-09-07 | Canon Inc | Objective lens and imaging device using the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1403844A (en) * | 2001-08-24 | 2003-03-19 | 佳能株式会社 | Lens system and camera with the same system |
| CN101923204A (en) * | 2009-06-16 | 2010-12-22 | 鸿富锦精密工业（深圳）有限公司 | Projection lens |
| CN106353875A (en) * | 2015-07-15 | 2017-01-25 | 先进光电科技股份有限公司 | Optical imaging system |
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