CN113640942B - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN113640942B CN113640942B CN202010392964.0A CN202010392964A CN113640942B CN 113640942 B CN113640942 B CN 113640942B CN 202010392964 A CN202010392964 A CN 202010392964A CN 113640942 B CN113640942 B CN 113640942B
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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
- G02B13/0035—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 three lenses
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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
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
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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
- G02B13/18—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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Abstract
The invention provides an optical lens, which sequentially comprises a first lens, a second lens and a third lens from an object side to an image side along an optical axis. The first lens element comprises a first object side surface facing the object side and a first image side surface facing the image side, wherein the first object side surface is convex. The second lens comprises a second object side surface facing the object side and a second image side surface facing the image side, wherein the second image side surface is a concave surface. The third lens element includes a third object-side surface facing the object side and a third image-side surface facing the image side, wherein the third object-side surface is a convex surface, and the third image-side surface is a convex surface. The optical lens satisfies formula 1 and is woven from BFL/OD3<5 or 2< (f + BFL)/OD 1<7.
Description
Technical Field
The invention relates to a lens. More particularly, the present invention relates to an optical lens for imaging.
Background
The development trend of the existing lens is not only towards miniaturization, but also needs to have high resolution capability along with different application requirements, and the existing lens cannot meet the current requirements, and needs another lens with a new structure to meet the requirements of miniaturization and high resolution at the same time.
Disclosure of Invention
The present invention is directed to an optical lens, which can meet the requirements of miniaturization and high resolution at the same time.
The present invention provides an optical lens assembly including, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, and a third lens element. The first lens element has positive refractive power and includes a first object-side surface facing the object side and a first image-side surface facing the image side, wherein the first object-side surface is convex. The second lens has negative refractive power and comprises a second object side surface facing the object side and a second image side surface facing the image side, wherein the second image side surface is a concave surface. The third lens element has positive refractive power and includes a third object-side surface facing the object side and a third image-side surface facing the image side, wherein the third object-side surface is convex and the third image-side surface is convex. The optical lens satisfies formula 1 and is woven from BFL/OD3<5 or 2< (f + BFL)/OD 1<7. Wherein BFL is a back focal length of the optical lens, OD3 is an effective diameter of the third lens element at the object side, f is an effective focal length of the optical lens, and OD1 is an effective diameter of the first lens element at the object side.
In some embodiments of the present invention, the optical lens satisfies the following formula: -3.5< -f/f 2<0, where f2 is the effective focal length of the second lens.
In some embodiments of the present invention, the optical lens satisfies the following formula: 2.5< -R21/R22 <3, wherein R21 is the curvature radius of the second object side surface, and R22 is the curvature radius of the second image side surface.
In some embodiments of the present invention, the optical lens satisfies the following formula: TTL/BFL <2 or 6 tow BFL/T1<11 are less than 0, where TTL is the total lens length of the optical lens, BFL is the rear focal length of the optical lens, and T1 is the thickness of the first lens in the optical axis direction.
In some embodiments of the present invention, the optical lens satisfies the following formula: 16 </f1 + f2 </21, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens.
In some embodiments of the present invention, the optical lens satisfies the following formula: 3.5-bfl/AAG <5.5 or 1-f/ALOD <2.3, where AAG is a total of an air gap between the first lens and the second lens plus an air gap between the second lens and the third lens, f is an effective focal length of the optical lens, and ALOD is a total of an effective diameter of the first lens on the object side, an effective diameter of the second lens on the object side, and an effective diameter of the third lens on the object side.
In some embodiments of the present invention, the lenses of the optical lens substantially sequentially include a first lens, a second lens and a third lens; the first lens is a meniscus lens, and the first image side surface is a concave surface; the second lens is a meniscus lens, and the second object side surface is a convex surface.
In some embodiments of the present invention, the optical lens further includes an optical path turning element disposed anywhere from the object side to the lens closest to the object side, or from the lens closest to the object side to the lens closest to the image side, or from the lens closest to the image side.
In some embodiments of the present invention, the optical lens assembly further includes another optical path turning element disposed between the object side and the lens closest to the object side, or between the lens closest to the object side and the lens closest to the image side, or between the lens closest to the image side and the image side without any optical path turning element disposed therebetween. The light path turning component and the other light path turning component are provided with reflecting surfaces, and the reflecting surfaces comprise metal layers.
The optical lens has the following beneficial effects: can meet the requirements of miniaturization and high resolution at the same time.
Drawings
Fig. 1 is a schematic view showing an optical lens in a first embodiment of the present invention.
Fig. 2A is a diagram showing an astigmatic Field Curvature (Field Curvature) of the optical lens according to the first embodiment of the present invention.
Fig. 2B is a diagram illustrating Distortion (Distortion) of the optical lens in the first embodiment of the present invention.
Fig. 2C is a diagram illustrating a Modulation Transfer Function (Modulation Transfer Function) of the optical lens according to the first embodiment of the invention.
Fig. 3 is a schematic view illustrating an optical lens system according to a second embodiment of the present invention.
Fig. 4A is an astigmatic field curvature diagram showing an optical lens in a second embodiment of the present invention.
Fig. 4B is a diagram illustrating distortion of an optical lens according to a second embodiment of the present invention.
Fig. 4C is a diagram illustrating a modulation transfer function of an optical lens according to a second embodiment of the present invention.
Fig. 5 is a schematic view showing an optical lens system according to a third embodiment of the present invention.
Fig. 6A is an astigmatic field curvature diagram showing an optical lens in a third embodiment of the present invention.
Fig. 6B is a diagram illustrating a distortion of an optical lens in a third embodiment of the present invention.
Fig. 6C is a diagram illustrating a modulation transfer function of an optical lens according to a third embodiment of the present invention.
Detailed Description
The optical lens of the present invention is explained below. It should be appreciated, however, that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The particular embodiments disclosed are illustrative only of the specific manner in which the invention may be practiced and are not intended to limit the scope of the invention.
Unless defined otherwise, 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 disclosure belongs. It will be 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 the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
An optical lens includes, in order from an object side to an image side, a first lens element, a second lens element, and a third lens element. The first lens element includes a first object-side surface facing the object side and a first image-side surface facing the image side, wherein the first object-side surface is convex and the first image-side surface is concave. The second lens element comprises a second object-side surface facing the object side and a second image-side surface facing the image side, wherein the second object-side surface is convex and the second image-side surface is concave. The third lens element includes a third object-side surface facing the object side and a third image-side surface facing the image side, wherein the third object-side surface is a convex surface, and the third image-side surface is a convex surface. In some embodiments, the optical lens satisfies the formula: 1 & lt BFL/OD3 & lt 5, wherein BFL is the back focal length of the optical lens, OD3 is the effective diameter of the third lens on the object side. In some embodiments, the optical lens satisfies the formula: 2< (f + BFL)/OD 1<7, wherein f is the effective focal length of the optical lens, and OD1 is the effective diameter of the first lens at the object side.
In addition, the optical lens can conform to at least one of the following formulas to improve the pixel resolution quality of the optical lens and achieve the purpose of easy manufacturing process.
-3.5 sj/f 2<0 (equation 1)
2.5 sP R21/R22<3 (formula 2)
0 woven TTL/BFL <2 (formula 3)
16 f1+ f2 cover (formula 4)
3.5 woven fabric BFL/AAG <5.5 (formula 5)
6-woven BFL/T1<11 (formula 6)
1 Ap f/ALOD <2.3 (formula 7)
1 Ap BFL/OD3<5 (equation 8)
2< (f + BFL)/OD 1<7 (equation 9)
In the above formulas, f is the effective focal length of the optical lens 10 in the first to third embodiments, TTL is the total lens length of the optical lens 10 in the first to third embodiments (i.e., the distance from the object-side surface of the first lens element 100 to the image plane of the optical sensor 700 on the optical axis AX 1), and BFL is the back focal length of the optical lens 10 in the first to third embodiments (i.e., the distance from the image-side surface of the third lens element 300 to the image plane of the optical sensor 700 on the optical axis AX 1). f1, OD1, and T1 are respectively the effective focal length of the first lens element 100, the effective diameter of the first lens element 100 on the object side, and the thickness of the first lens element 100 in the direction of the optical axis AX1 (i.e., the distance from the object side surface of the first lens element 100 to the image side surface of the first lens element 100 on the optical axis AX 1) in the first to third embodiments, f2 is the effective focal length of the second lens element 200 in the first to third embodiments, and f3 and OD3 are respectively the effective focal length of the third lens element 300 and the effective diameter of the third lens element 300 on the object side in the first to third embodiments. The ALOD is a total of an effective diameter of the first lens element 100, an effective diameter of the second lens element 200, and an effective diameter of the third lens element 300 on the object side in the first to third embodiments. R21 is a radius of curvature of the second object side surface 210 of the second lens element 200 in the first to third embodiments, and R22 is a radius of curvature of the second image side surface 220 of the second lens element 200 in the first to third embodiments. AAG is the sum of the air gaps between the lenses in the first to third embodiments, that is, the sum of the air gap D12 between the first lens 100 and the second lens 200 plus the air gap D23 between the second lens 200 and the third lens 300.
It should be noted that, the expressions 8 "1 and 1 are restricted to BFL/OD3< 5" and 9 "2 < (f + BFL)/OD 1< 7" are the ratio of the BFL back focal length to the effective diameter of the third lens 300 on the object side and the ratio of the sum of the f effective focal length and the BFL back focal length of the optical lens 10 to the effective diameter of the first lens 100 on the object side, respectively, wherein the ratio of the f effective focal length and the BFL back focal length of the optical lens 10 is one of the important factors affecting the zoom magnification of the optical lens, and satisfying the above conditions can increase the back focal length to achieve higher magnification optical zooming, and at the same time, without increasing the size of the lens module, the effect of thinning the optical lens 10, and the sensitivity of the optical system can be reduced.
Fig. 1 is a schematic view of an optical lens 10 according to a first embodiment of the present invention. As shown in fig. 1, the optical lens 10 includes, in order along an optical axis AX1 from an object side to an image side, a first lens element 100, an aperture stop 400, a second lens element 200, a third lens element 300, an optical path turning element 500, an optical filter 600, and a photosensitive element 700. The first lens 100, the second lens 200, the third lens 300, and the diaphragm 400 are close to the object side, and the second lens 400 and the diaphragm 400 are disposed between the first lens 100 and the third lens 300, and the second lens 400 is disposed between the diaphragm 400 and the third lens 300. The optical path turning component 500, the optical filter 600 and the photosensitive component 700 are close to the image side, and the optical filter 600 is disposed between the optical path turning component 500 and the photosensitive component 700, wherein the optical path turning component 500 may be a prism or a mirror for changing the light traveling direction, and the optical path turning component 500 has a reflective surface, and the reflective surface includes a metal layer, for example, an aluminum layer is plated in a film plating manner, but the invention is not limited thereto, and the manufacturing manner of the metal layer is not limited thereto. The light from the object side can reach the photosensitive element 700 after passing through the first lens element 100, the second lens element 200, the third lens element 300, the light path turning element 500 and the optical filter 600 in sequence, and form an image on the photosensitive element 700.
The first lens element 100 is a meniscus lens element with a positive refractive power, and includes a first object-side surface 110 facing an object side and a first image-side surface 120 facing an image side. The first object-side surface 110 is convex, and the first image-side surface 120 is concave. The first lens 100 may be made of glass or plastic, for example.
The second lens 200 is a meniscus lens with negative refractive power, and includes a second object-side surface 210 facing the object side and a second image-side surface 220 facing the image side. The second image-side surface 220 is concave and the second object-side surface 210 is convex. The second lens 200 may be made of glass or plastic, for example.
The third lens element 300 is a biconvex lens element with positive refractive power, and includes a third object-side surface 310 facing the object side and a third image-side surface 320 facing the image side. The third object-side surface 310 is convex, and the second image-side surface 320 is also convex. Therefore, the back focal length of the optical lens 10 can be increased. In this embodiment, the third lens 300 can be made of glass or plastic, for example.
Table one is a table of relevant parameters of each lens of the optical lens 10 in fig. 1.
In the first embodiment, the effective focal length f is 30mm, and the effective focal length f2 of the second lens 200 is-10.331 mm. Thus, f/f2 in equation 1 may be about-2.903.
The radius of curvature of the second image-side surface 210 is 12.1052mm and the radius of curvature of the second image-side surface 220 is 4.505652mm. Thus, R21/R22 in equation 2 may be about 2.686.
The total lens length of the optical lens 10 is 34.05mm, and the back focal length of the optical lens 10 is 22.72mm. Thus, TTL/BFL in equation 3 can be approximately 1.498.
The effective focal length f1 of the first lens 200 is 29.483mm, and the effective focal length f2 of the second lens 200 is-10.331 mm. Therefore, f1+ f2 in equation 4 may be about 19.152mm.
The optical lens 10 has a back focal length of 22.72mm, an air gap D12 along the optical axis AX1 between the first image-side surface 120 of the first lens element 100 and the second object-side surface 210 of the second lens element 200 is 3.814mm, an air gap D23 along the optical axis AX1 between the second image-side surface 220 of the second lens element 200 and the third object-side surface 310 of the third lens element 300 is 1.592mm, and an aag is 5.406mm. Thus, the BFL/AAG may be about 4.202 in equation 5.
The optical lens 10 has a back focal length of 22.72mm and the first lens 100 has a thickness of 2.864mm in the optical axis AX1 direction. Thus, BFL/T1 may be approximately 7.932 in equation 6.
The effective focal length f is 30mm, the effective diameter of the first lens element 100 on the object side is 9.34mm, the effective diameter of the second lens element 200 on the object side is 7.121mm, and the effective diameter of the third lens element 300 on the object side is 7.123mm. Therefore, in equation 7 f/ALOD may be about 1.272.
The optical lens 10 has a back focal length of 22.72mm, and the effective diameter of the third lens 300 at the object side is 7.123mm. Thus, BFL/OD3 may be approximately 3.189 in equation 8.
The effective focal length f is 30mm, the back focal length of the optical lens 10 is 22.72mm, and the effective diameter of the first lens element 100 on the object side is 9.34mm. Thus, (f + BFL)/OD 1 in equation 9 may be about 5.644.
The aspherical surface sag z of each lens in table i is given by the following equation:
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 +Gh 16
where c is the curvature, h is the perpendicular distance from any point on the lens surface to the optical axis AX1, and k is the Conic coefficient (Conic Constant). A to G are aspherical coefficients.
The second table is a table of the relevant parameters of the aspheric surface of each lens in the first table.
Watch two
In addition, in the present embodiment, the second lens 200 and the diaphragm 400 partially overlap when viewed from a direction perpendicular to the optical axis AX 1. In other words, the second lens element 200 passes through the aperture stop 400, and the distance between at least a portion of the second object-side surface 210 and the first lens element 200 is smaller than the distance between the aperture stop 400 and the first lens element 200. In the present embodiment, the distance between the second object-side surface 210 and the first lens 200 is smaller than the distance between the stop 400 and the first lens 200 by 0.3672631mm on the optical axis AX 1.
Fig. 2A is an astigmatic Field Curvature (Field Curvature) diagram of the optical lens 10 according to the first embodiment of the present invention. As shown in fig. 2A, with the optical lens 10 of the first embodiment, the field curvature of the meridional (tagential) direction and the Sagittal (Sagittal) direction generated by the light is between-0.045 mm and 0.070 mm. Fig. 2B is a diagram of Distortion (aberration) of the optical lens 10 according to the first embodiment of the present invention. As shown in fig. 2B, the distortion of the light beam generated by the optical lens 10 of the first embodiment is between-0.9% and 0%. Fig. 2C is a Modulation Transfer Function (Modulation Transfer Function) diagram of the optical lens 10 according to the first embodiment of the present invention. As shown in fig. 2C, the spatial frequency ranges from 0lp/mm to 156lp/mm, and the modulation transfer function value of the optical lens 10 of the first embodiment may range from 0.4 to 1.0. Therefore, in the present embodiment, the curvature of field and the distortion of the optical lens 10 can be effectively corrected, and the lens resolution can also meet the requirement, so as to obtain better optical performance.
In some embodiments, components of the optical lens 10 may be added or omitted according to the usage requirement without changing the optical characteristics of the optical lens 10. For example, in some embodiments, the optical filter 600 in the optical lens 10 may be omitted as required, or another optical path turning component may be added between the object side and the first lens 200, so as to increase the focal length of the entire system, and a periscopic bending structure is achieved by the other optical path turning component, so that the size, volume, and thickness of the lens module can be controlled to maintain thinness, and the light from the object side can sequentially pass through the other optical path turning component, the first lens, the second lens, the third lens, the optical path turning component, and the optical filter to reach the photosensitive component; or another optical path turning component is added among the plurality of lenses, and light from the object side can sequentially pass through the lens closest to the object side, the other optical path turning component, the lens closest to the image side, the optical path turning component and the optical filter and then reach the photosensitive component.
Referring to fig. 3, fig. 3 is a schematic view of an optical lens 10 according to a second embodiment of the invention. The optical lens 10 includes, in order along an optical axis AX1 from an object side to an image side, a first lens element 100, an aperture stop 400, a second lens element 200, a third lens element 300, an optical path turning element 500, an optical filter 600, and a photosensitive element 700. The light from the object side can reach the photosensitive element 700 after passing through the first lens element 100, the second lens element 200, the third lens element 300, the light path turning element 500 and the optical filter 600 in sequence, and form an image on the photosensitive element 700. In the second embodiment, the first lens element 100, the second lens element 200 and the third lens element 300 can have positive refractive power, negative refractive power and positive refractive power, respectively, and the surface type is substantially the same as that of the first embodiment, and thus the description thereof is omitted. Table three is a table of relevant parameters of each lens of the optical lens 10 in fig. 3.
Watch III
Table four is a table of relevant parameters of the aspherical surfaces of the respective lenses in table three.
Watch four
In the embodiment, the optical lens 10 can satisfy at least one of the above formulas 1 to 9 to improve the pixel resolution quality of the optical lens and achieve the purpose of easy manufacturing process, and is particularly applicable to electronic devices such as smart mobile terminal devices, mobile phones, and tablets, and the back focal length can be increased without increasing the size, volume, length, and thickness of the lens, so that the optical lens 10 can achieve optical zoom with higher magnification.
In the second embodiment, the effective focal length f is 29.92mm, and the effective focal length f2 of the second lens 200 is-10.243 mm. Thus, f/f2 in equation 1 may be about-2.920.
The radius of curvature of the second image-side surface 210 is 11.69079mm, and the radius of curvature of the second image-side surface 220 is 4.405977mm. Therefore, R21/R22 in equation 2 can be about 2.653.
The total lens length of the optical lens 10 is 34.21mm, and the back focal length of the optical lens 10 is 22.72mm. Thus, TTL/BFL in equation 3 can be approximately 1.505.
The effective focal length f1 of the first lens 200 is 28.833mm, and the effective focal length f2 of the second lens 200 is-10.243 mm. Thus, in equation 4 f1+ f2 may be about 18.590mm.
The optical lens 10 has a back focal length of 22.72mm, an air gap D12 along the optical axis AX1 between the first image-side surface 120 of the first lens element 100 and the second object-side surface 210 of the second lens element 200 is 4.11mm, an air gap D23 along the optical axis AX1 between the second image-side surface 220 of the second lens element 200 and the third object-side surface 310 of the third lens element 300 is 1.612mm, and an aag of 5.722mm. Thus, the BFL/AAG may be about 3.970 in equation 5.
The optical lens 10 has a back focal length of 22.72mm and the first lens 100 has a thickness of 2.368mm in the direction of the optical axis AX 1. Therefore, BFL/T1 may be approximately 9.594 in equation 6.
The effective focal length f is 29.92mm, the effective diameter of the first lens element 100 at the object side is 9.34mm, the effective diameter of the second lens element 200 at the object side is 6.858mm, and the effective diameter of the third lens element 300 at the object side is 7.097mm. Therefore, in equation 7 f/ALOD can be about 1.284.
The optical lens 10 has a back focal length of 22.72mm, and the effective diameter of the third lens 300 on the object side is 7.097mm. Therefore, BFL/OD3 may be approximately 3.201 in equation 8.
The effective focal length f is 29.92mm, the back focal length of the optical lens 10 is 22.72mm, and the effective diameter of the first lens element 100 on the object side is 9.34mm. Thus, (f + BFL)/OD 1 in equation 9 may be about 5.635.
The aspherical surface sag z of each lens of the optical lens 10 in the second embodiment can be similar to that in the first embodiment, and therefore, the description thereof is omitted. In addition, in the second embodiment, the distance between the second object side surface 210 and the first lens 200 is smaller than the distance between the stop 400 and the first lens 200 by 0.02973503mm on the optical axis AX 1. In some embodiments, the second lens element 200 and the stop 400 may not overlap when viewed from a direction perpendicular to the optical axis AX1, and the stop 400 may align with the second object-side surface 210 of the second lens element 200.
Fig. 4A is an astigmatic field curvature diagram of an optical lens 10 according to a second embodiment of the present invention. As shown in fig. 4A, with the optical lens 10 of the second embodiment, the field curvature in the meridional direction and the sagittal direction generated by the light rays is between-0.090 mm and 0.045 mm. Fig. 4B is a distortion diagram of the optical lens 10 according to the second embodiment of the invention. As shown in FIG. 4B, the distortion of the light beam generated by the optical lens 10 of the second embodiment is between-1.0% and 0%. Fig. 4C is a diagram of a modulation transfer function of the optical lens 10 according to the second embodiment of the present invention. As shown in fig. 4C, the spatial frequency ranges from 0lp/mm to 156lp/mm, and the modulation transfer function value of the optical lens 10 of the second embodiment may range from 0.4 to 1.0. Therefore, in the present embodiment, the curvature of field and the distortion of the optical lens 10 can be effectively corrected, and the lens resolution can also meet the requirement, so as to obtain better optical performance.
Referring to fig. 5, fig. 5 is a schematic diagram of an optical lens 10 according to a third embodiment of the invention. The optical lens 10 includes, in order along an optical axis AX1 from an object side to an image side, a first lens element 100, an aperture stop 400, a second lens element 200, a third lens element 300, an optical path turning element 500, an optical filter 600, and a photosensitive element 700. The light from the object side can reach the photosensitive element 700 after passing through the first lens element 100, the second lens element 200, the third lens element 300, the light path turning element 500 and the optical filter 600 in sequence, and form an image on the photosensitive element 700. In the third embodiment, the first lens 100, the second lens 200 and the third lens 300 can have positive refractive power, negative refractive power and positive refractive power respectively, and the surface type is substantially the same as that of the first embodiment, and thus the description is omitted. Table five is a table of relevant parameters of each lens of the optical lens 10 in fig. 5.
Watch five
Table six is a table of relevant parameters of the aspherical surfaces of the respective lenses in table five.
Watch six
In the embodiment, the optical lens 10 can satisfy at least one of the above formulas 1 to 9 to improve the pixel resolution quality of the optical lens and achieve the purpose of easy manufacturing process, and is particularly applicable to electronic devices such as smart mobile terminal devices, mobile phones, and tablets, and the back focal length can be increased without increasing the size, volume, length, and thickness of the lens, so that the optical lens 10 can achieve optical zoom with higher magnification.
In the third embodiment, the effective focal length f is 29.91mm, and the effective focal length f2 of the second lens 200 is-10.263 mm. Thus, f/f2 in equation 1 may be about-2.914.
The radius of curvature of the second image-side surface 220 is 4.475316mm, and the radius of curvature of the second object-side surface 210 is 12.11689 mm. Therefore, R21/R22 in equation 2 may be about 2.707.
The total lens length of the optical lens 10 is 34.06mm, and the back focal length of the optical lens 10 is 22.72mm. Thus, TTL/BFL in equation 3 can be about 1.499.
The effective focal length f1 of the first lens 200 is 28.862mm, and the effective focal length f2 of the second lens 200 is-10.263 mm. Thus, in equation 4 f1+ f2 may be about 18.598mm.
The optical lens 10 has a back focal length of 22.72mm, an air gap D12 along the optical axis AX1 between the first image-side surface 120 of the first lens element 100 and the second object-side surface 210 of the second lens element 200 is 3.879mm, an air gap D23 along the optical axis AX1 between the second image-side surface 220 of the second lens element 200 and the third object-side surface 310 of the third lens element 300 is 1.59mm, and aag is 5.469mm. Thus, the BFL/AAG may be about 4.154 in equation 5.
The optical lens 10 has a back focal length of 22.72mm and the first lens 100 has a thickness of 2.803mm in the optical axis AX1 direction. Thus, BFL/T1 may be approximately 8.105 in equation 6.
The effective focal length f is 29.91mm, the effective diameter of the first lens 100 at the object side is 9.34mm, the effective diameter of the second lens 200 at the object side is 7.028mm, and the effective diameter of the third lens 300 at the object side is 7.069mm. Therefore, in equation 7 f/ALOD may be about 1.276.
The optical lens 10 has a back focal length of 22.72mm, and the effective diameter of the third lens 300 on the object side is 7.069mm. Thus, BFL/OD3 may be approximately 3.214 in equation 8.
The effective focal length f is 29.91mm, the back focal length of the optical lens 10 is 22.72mm, and the effective diameter of the first lens element 100 on the object side is 9.34mm. Thus, (f + BFL)/OD 1 in equation 9 may be about 5.634.
Similarly, the aspheric surface concavity z of each lens of the optical lens 10 in the third embodiment is similar to that in the first embodiment, and therefore will not be described herein again. In addition, in the second embodiment, the distance between the second object side surface 210 and the first lens 200 is smaller than the distance between the diaphragm 400 and the first lens 200 by 0.3591613mm on the optical axis AX 1.
Fig. 6A is an astigmatic field curvature diagram of an optical lens 10 according to a third embodiment of the present invention. As shown in fig. 6A, with the optical lens 10 of the third embodiment, the field curvature in the meridional direction and the sagittal direction generated by the light rays is between-0.020 mm and 0.090 mm. Fig. 6B is a distortion diagram of an optical lens 10 according to a third embodiment of the invention. As shown in FIG. 6B, the distortion of the light beam generated by the optical lens 10 of the third embodiment is between-0.9% and 0%. Fig. 6C is a diagram of a modulation transfer function of an optical lens 10 according to a third embodiment of the invention. As shown in fig. 6C, the spatial frequency ranges from 0lp/mm to 156lp/mm, and the modulation transfer function value of the optical lens 10 according to the third embodiment may range from 0.3 to 1.0.
Therefore, in the present embodiment, the curvature of field and the distortion of the optical lens 10 can be effectively corrected, and the lens resolution can also meet the requirement, so as to obtain better optical performance.
In summary, the optical lens provided by the present invention has good optical performance, improves the pixel resolution quality of the optical lens, and achieves the purpose of easy processing.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims. Furthermore, each claim constitutes a separate embodiment, and various combinations of claims and embodiments are within the scope of the invention.
Claims (10)
1. An optical lens, comprising three lenses having refractive power from an object side to an image side along an optical axis, in order:
the first lens element has positive refractive power and comprises a first object side surface facing the object side and a first image side surface facing the image side, wherein the first object side surface is a convex surface;
the second lens element has negative refractive power and comprises a second object side surface facing the object side and a second image side surface facing the image side, wherein the second image side surface is a concave surface; and
the third lens element with positive refractive power comprises a third object-side surface facing the object side and a third image-side surface facing the image side, wherein the third object-side surface is convex and the third image-side surface is convex;
wherein the optical lens satisfies the following formula:
1<BFL/OD3<5，
6<BFL/T1<11，
wherein BFL is a back focal length of the optical lens, OD3 is an effective diameter of the third lens element at the object side, and T1 is a thickness of the first lens element in the optical axis direction.
2. An optical lens, comprising three lenses having refractive power from an object side to an image side along an optical axis, in order:
the first lens element has positive refractive power and comprises a first object side surface facing the object side and a first image side surface facing the image side, wherein the first object side surface is a convex surface;
the second lens element has negative refractive power and comprises a second object side surface facing the object side and a second image side surface facing the image side, wherein the second image side surface is a concave surface; and
the third lens element with positive refractive power comprises a third object-side surface facing the object side and a third image-side surface facing the image side, wherein the third object-side surface is convex and the third image-side surface is convex;
wherein the optical lens satisfies the following formula:
2<(f+BFL)/OD1<7，
6<BFL/T1<11，
wherein f is an effective focal length of the optical lens, BFL is a back focal length of the optical lens, OD1 is an effective diameter of the first lens at the object side, and T1 is a thickness of the first lens in the optical axis direction.
3. An optical lens according to claim 1 or claim 2, characterized in that the optical lens satisfies the following formula:
-3.5-f/f 2<0, where f is the effective focal length of the optical lens and f2 is the effective focal length of the second lens.
4. An optical lens according to claim 3, wherein the optical lens satisfies the following formula:
2.5< -R21/R22 <3, wherein R21 is the radius of curvature of the second object-side surface, and R22 is the radius of curvature of the second image-side surface.
5. An optical lens according to claim 1 or claim 2, characterized in that the optical lens satisfies the following formula:
0<TTL/BFL<2，
wherein TTL is the total lens length of the optical lens.
6. An optical lens according to claim 5, wherein the optical lens satisfies the following formula:
16 </f 1+ f2<21, where f1 is the effective focal length of the first lens and f2 is the effective focal length of the second lens.
7. An optical lens according to claim 1 or claim 2, characterized in that it satisfies any one of the following equations:
3.5<BFL/AAG<5.5，
1<f/ALOD<2.3，
wherein AAG is a sum of an air gap between the first lens and the second lens and an air gap between the second lens and the third lens, f is an effective focal length of the optical lens, and ALOD is a sum of an effective diameter of the first lens at the object side, an effective diameter of the second lens at the object side, and an effective diameter of the third lens at the object side.
8. An optical lens barrel according to claim 1 or claim 2, wherein the first lens element is a meniscus lens element and the first image side surface is concave; the second lens is a meniscus lens, and the second object side surface is a convex surface.
9. The optical lens system of claim 8, further comprising an optical path deflecting element disposed anywhere from the object side to the lens closest to the object side or from the lens closest to the object side to the lens closest to the image side or from the lens closest to the image side.
10. The optical lens assembly as claimed in claim 9, further comprising another optical path turning element disposed anywhere from the object side to the lens closest to the object side or from the lens closest to the object side to the lens closest to the image side or from the lens closest to the image side without the optical path turning element disposed therebetween; wherein the light path turning component and the other light path turning component are both provided with a reflecting surface, and the reflecting surface comprises a metal layer.
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| CN202010392964.0A CN113640942B (en) | 2020-05-11 | 2020-05-11 | Optical lens |
| US17/186,124 US20210278633A1 (en) | 2020-03-05 | 2021-02-26 | Optical camera lens |
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| JP2001124986A (en) * | 1999-10-26 | 2001-05-11 | Canon Inc | Image read lens and image reader using the same |
| JP2017053887A (en) * | 2015-09-07 | 2017-03-16 | 株式会社ニコン | Imaging lens and imaging system |
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| TWI680322B (en) * | 2018-11-27 | 2019-12-21 | 大立光電股份有限公司 | Lens system, projection apparatus, detecting module and electronic device |
| CN210323553U (en) * | 2019-06-28 | 2020-04-14 | 南昌欧菲精密光学制品有限公司 | Imaging lens, camera module and electronic device |
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| JP2001124986A (en) * | 1999-10-26 | 2001-05-11 | Canon Inc | Image read lens and image reader using the same |
| JP2017053887A (en) * | 2015-09-07 | 2017-03-16 | 株式会社ニコン | Imaging lens and imaging system |
| CN208689247U (en) * | 2018-08-31 | 2019-04-02 | 广景视睿科技（深圳）有限公司 | A kind of Miniature projection lens and the nearly eye display device of waveguide |
| TWI680322B (en) * | 2018-11-27 | 2019-12-21 | 大立光電股份有限公司 | Lens system, projection apparatus, detecting module and electronic device |
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