CN102854611B - Microminiature imaging lens - Google Patents
Microminiature imaging lens Download PDFInfo
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- CN102854611B CN102854611B CN201210061564.7A CN201210061564A CN102854611B CN 102854611 B CN102854611 B CN 102854611B CN 201210061564 A CN201210061564 A CN 201210061564A CN 102854611 B CN102854611 B CN 102854611B
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Abstract
The invention relates to a microminiature imaging lens. The microminiature imaging lens comprises a first lens, a second lens, a third lens, an aperture, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the first lens is a crescent lens with negative refractive power, the convex side of the first lens faces towards the object side, at least one surface of the first lens is an aspheric surface, the second lens is a biconvex lens with positive refractive power, the third lens is a biconcave lens with the negative refractive power, the fourth lens is a biconvex lens with the positive refractive power, at least one surface of the fourth lens is the aspheric surface, and the fifth lens is a lens with the negative refractive power. By means of the lenses, the microminiature imaging lens has the advantages that the miniaturization and high optical efficiency can be achieved.
Description
Technical field
The present invention is relevant with optical devices, in more detail refers to a kind of microminiature imaging lens.
Background technology
In recent years, along with the progress of science and technology, as image capture units such as camera, video camera, microscope or scanners, carry and use for convenience of people, and tending to miniaturization and lightweight gradually, therefore the volume of the imaging lens making image capture unit used is also significantly reduced by this.In addition, except miniaturization and lightweight, also want to have higher optical performance, just can make to reach representing of high resolving power and high contrast.Therefore, miniaturization and high optical performance are indispensable two important documents of imaging lens.
But the imaging lens that current image capture unit adopts, for reaching the object of high optical performance, nothing more than the mirror group employing many groups, even has eyeglass to sum up more than more than ten persons.In addition, also promisingly reach the object making imaging lens miniaturization, and only use several pieces eyeglasses, but make its optical performance effectively to promote.
Comprehensive the above, known imaging lens is not detectd perfect yet, and the part that still haves much room for improvement.
Summary of the invention
The technical problem to be solved in the present invention is, cannot meet the defect of miniaturization and high optical performance for imaging lens of the prior art simultaneously, provides a kind of microminiature imaging lens, and not only volume is little and have high optical performance.
The technical scheme that the present invention adopts for its technical matters of solution is, provides a kind of microminiature imaging lens, includes along optical axis and by the first eyeglass of thing side to image side sequential, the second eyeglass, the 3rd eyeglass, aperture, the 4th eyeglass and the 5th eyeglass.Wherein, this first eyeglass is the meniscus eyeglass with negative refractive power, and it is convex surface facing this thing side, and at least one side is non-spherical surface; This second eyeglass is the biconvex eyeglass with positive refractive power; 3rd eyeglass is the concave-concave eyeglass with negative refractive power; 4th eyeglass is the biconvex eyeglass with positive refractive power, and at least one side is non-spherical surface; 5th eyeglass is the eyeglass with negative refractive power.
By this, utilize the configuration of above-mentioned eyeglass and aperture and reach the object of miniaturization and high optical performance.
Accompanying drawing explanation
Fig. 1 is the eyeglass arrangement plan of the present invention first preferred embodiment.
Fig. 2 is the index path of the present invention first preferred embodiment.
Fig. 3 A is curvature of field figure and the distortion figure of the present invention first preferred embodiment.
Fig. 3 B is the lateral light fan figure of the present invention first preferred embodiment.
Fig. 3 C is the out of focus modulation transfer function figure of the present invention first preferred embodiment.
Fig. 3 D is the Space Frequency Modulation transport function figure of the present invention first preferred embodiment.
Fig. 4 is the eyeglass arrangement plan of the present invention second preferred embodiment.
Fig. 5 is the index path of the present invention second preferred embodiment.
Fig. 6 A is curvature of field figure and the distortion figure of the present invention second preferred embodiment.
Fig. 6 B is the lateral light fan figure of the present invention second preferred embodiment.
Fig. 6 C is the out of focus modulation transfer function figure of the present invention second preferred embodiment.
Fig. 6 D is the Space Frequency Modulation transport function figure of the present invention second preferred embodiment.
Fig. 7 is the eyeglass arrangement plan of the present invention the 3rd preferred embodiment.
Fig. 8 is the index path of the present invention the 3rd preferred embodiment.
Fig. 9 A is curvature of field figure and the distortion figure of the present invention the 3rd preferred embodiment.
Fig. 9 B is the lateral light fan figure of the present invention the 3rd preferred embodiment.
Fig. 9 C is the out of focus modulation transfer function figure of the present invention the 3rd preferred embodiment.
Fig. 9 D is the Space Frequency Modulation transport function figure of the present invention the 3rd preferred embodiment.
Embodiment
For can the present invention be illustrated more clearly in, hereby lifts preferred embodiment and coordinate accompanying drawing to be described in detail as follows.
Referring to Fig. 1, is the eyeglass arrangement plan of the microminiature imaging lens 1 of the present invention first preferred embodiment.Fig. 2 is index path embodiment illustrated in fig. 1.Coordinate Fig. 1 and Fig. 2, will the microminiature imaging lens 1 of first embodiment of the invention be described in detail below.
This microminiature imaging lens 1 includes along optical axis Z and by the first eyeglass L1, the second eyeglass L2 of thing side to image side sequential, the 3rd eyeglass L3, aperture ST, the 4th eyeglass L4 and the 5th eyeglass L5.In addition, according to the demand used, between the 5th eyeglass L5 and imaging plane IP (Image Plane), optionally arrange optical filter CF, be sheet glass.Wherein:
This first eyeglass L1 made by glass material, and is a meniscus eyeglass with negative refractive power, and it is convex surface facing thing side.In addition, the convex surface S1 of this first eyeglass L1 and concave surface S2 is all non-spherical surface.
This second eyeglass L2 made by glass material, and is a biconvex eyeglass with positive refractive power.3rd eyeglass L3 made by glass material, and is a concave-concave eyeglass with negative refractive power.In addition, this second eyeglass L2 and the 3rd eyeglass L3 gluing form the cemented doublet L23 that has positive refractive power.
4th eyeglass L4 made by glass material, and is a biconvex eyeglass with positive refractive power.In addition, two convex surfaces S8, S9 of the 4th eyeglass L4 are all non-spherical surface.
5th eyeglass L5 made by glass material, and is a meniscus eyeglass with negative refractive power, and its convex surface S11 is towards image side.
And in the eyeglass configuration of above-mentioned microminiature imaging lens 1, the aspheric design of the negative refractive power characteristic of this first eyeglass L1, the positive refractive power characteristic of the 4th eyeglass L4 and this two eyeglass L1, L4, this microminiature imaging lens 1 can be made to have preferably imaging effect, and can effectively shorten camera lens overall length, this microminiature imaging lens 1 more can be made to obtain larger angle of visibility (Field of View Angle, FOV).
Focal length F (Focus Length), the numerical aperture Fno (F-number) of the microminiature imaging lens 1 of first embodiment of the invention, the optical axis Z of each lens surface by the radius of curvature R (radius of curvature) at place, the thickness T (thickness) of each eyeglass on optical axis Z, the refractive index Nd (refractive index) of each eyeglass and the Abbe number Vd (Abbe number) of each eyeglass, as shown in Table 1:
Table one
In each eyeglass of the present embodiment, the surface indentation degree z of these non-spherical surfaces S1, S2, S8 and S9 obtained by following formula:
Wherein:
Z: the depression degree of non-spherical surface;
C: the inverse of radius-of-curvature;
H: the aperture radius on surface;
K: circular cone coefficient;
A ~ G: each rank coefficient of the aperture radius h on surface.
In the present embodiment, each rank coefficient A ~ G of the circular cone coefficient k (conic constant) of each non-spherical surface and surface apertures radius h is as shown in Table 2:
Table two
The eyeglass of above and aperture ST configure, and make the microminiature imaging lens 1 of the present embodiment not only effectively reduced volume to meet the demand of miniaturization, image quality also can reach requirement, this can find out from Fig. 3 A to Fig. 3 D.
Shown in Fig. 3 A, be curvature of field figure and the distortion figure of the microminiature imaging lens 1 of the present embodiment; Shown in Fig. 3 B, be the lateral light fan figure of the microminiature imaging lens 1 of the present embodiment; Shown in Fig. 3 C, be the out of focus modulation transfer function figure (Through Focus MTF) of the microminiature imaging lens 1 of the present embodiment; Shown in Fig. 3 D, be the Space Frequency Modulation transport function figure (Spatial Frequency MTF) of the microminiature imaging lens 1 of the present embodiment.
Can find out from Fig. 3 A, the maximum curvature of field of the present embodiment is no more than 0.1mm and-0.1mm, and amount of distortion is no more than 0.6%.Can find out from Fig. 3 B and Fig. 3 C, the present embodiment all has good resolution in which field positions.From Fig. 3 D, the present embodiment is the time marquis of 48lp/mm, and its modulated optical transfer function values still maintains more than 60%, and the resolution of the microminiature imaging lens 1 of obvious the present embodiment is standard compliant.
Above-described, be the microminiature imaging lens 1 of first embodiment of the invention; According to technology of the present invention, below coordinate Fig. 4 and Fig. 5 that the second embodiment of the present invention is described.
Identically with the first embodiment, the microminiature imaging lens 2 of second embodiment of the invention to include from thing side to image side and the first eyeglass L1, the second eyeglass L2 that arrange along optical axis Z, the 3rd eyeglass L3, aperture ST, the 4th eyeglass L4 and the 5th eyeglass L5, and at the 5th eyeglass L5 optical filter CF that be provided with sheet glass same with between imaging plane IP.Wherein:
This first eyeglass L1 made by glass material, and is a meniscus eyeglass with negative refractive power, and its convex surface S1 is towards thing side.In addition, the convex surface S1 of this first eyeglass L1 and concave surface S2 is all non-spherical surface.
This second eyeglass L2 made by glass material, and is a biconvex eyeglass with positive refractive power.3rd eyeglass L3 made by glass material, and is a concave-concave eyeglass with negative refractive power.In addition, this second eyeglass L2 and the 3rd eyeglass L3 gluing form the cemented doublet L23 that has positive refractive power.
4th eyeglass L4 made by glass material, and is a biconvex eyeglass with positive refractive power.In addition, two convex surfaces S8, S9 of the 4th eyeglass L4 are all non-spherical surface.
5th eyeglass L5 made by glass material, and is a meniscus eyeglass with negative refractive power, and its convex surface S11 is towards image side.
And in above-mentioned eyeglass configuration, the wherein aspheric design of the negative refractive power characteristic of this first eyeglass L1, the positive refractive power characteristic of the 4th eyeglass L4 and this two eyeglass L1, L4, this microminiature imaging lens 2 can be made equally to have preferably imaging effect, effective shortening camera lens overall length and make this microminiature imaging lens 2 obtain larger angle of visibility (Field of View Angle, FOV).
Focal length F (Focus Length), the numerical aperture Fno (F-number) of the microminiature imaging lens 2 of second embodiment of the invention, the optical axis Z of each lens surface by the radius of curvature R (radius of curvature) at place, the thickness T (thickness) of each eyeglass on optical axis Z, the refractive index Nd (refractive index) of each eyeglass and the Abbe number Vd (Abbe number) of each eyeglass, as shown in Table 3:
Table three
In each eyeglass of the present embodiment, the surface indentation degree z of these non-spherical surfaces S1, S2, S8 and S9 obtained by following formula:
Wherein:
Z: the depression degree of non-spherical surface;
C: the inverse of radius-of-curvature;
H: the aperture radius on surface;
K: circular cone coefficient;
A ~ G: each rank coefficient of the aperture radius h on surface.
In the present embodiment, each rank coefficient A ~ G of the circular cone coefficient k (conic constant) of each non-spherical surface and surface apertures radius h is as shown in Table 4:
Table four
The eyeglass of above and aperture ST configure, and make the microminiature imaging lens 2 of the present embodiment not only effectively reduced volume to reach the demand of miniaturization, image quality also can reach requirement, this can find out from Fig. 6 A to Fig. 6 D.
Shown in Fig. 6 A, be curvature of field figure and the distortion figure of the microminiature imaging lens 2 of the present embodiment; Shown in Fig. 6 B, be the lateral light fan figure of the microminiature imaging lens 2 of the present embodiment; Shown in Fig. 6 C, be the out of focus modulation transfer function figure (Through Focus MTF) of the microminiature imaging lens 2 of the present embodiment; Shown in Fig. 6 D, be the Space Frequency Modulation transport function figure (Spatial Frequency MTF) of the microminiature imaging lens 2 of the present embodiment.
Can find out from Fig. 6 A, the maximum curvature of field of the present embodiment is no more than 0.1mm and-0.1mm, and amount of distortion is no more than 0.6%.Can find out from Fig. 6 B and Fig. 6 C, the present embodiment all has good resolution in which field positions.From Fig. 6 D, the present embodiment is the time marquis of 48lp/mm, and its modulated optical transfer function values still maintains more than 50%, and the resolution of the microminiature imaging lens 2 of obvious the present embodiment is standard compliant.
Referring to Fig. 7 and Fig. 8, is eyeglass configuration and the index path of the microminiature imaging lens 3 of the present invention the 3rd preferred embodiment.This microminiature imaging lens 3 to include equally from thing side to image side and the first eyeglass L1, the second eyeglass L2 that arrange along optical axis Z, the 3rd eyeglass L3, aperture ST, the 4th eyeglass L4 and the 5th eyeglass L5, and at the 5th eyeglass L5 optical filter CF that be provided with sheet glass same with between imaging plane IP.Wherein:
This first eyeglass L1 made by glass material, and is a meniscus eyeglass with negative refractive power, and it is convex surface facing thing side.In addition, the convex surface S1 of this first eyeglass L1 and concave surface S2 is all non-spherical surface.
This second eyeglass L2 made by glass material, and is a biconvex eyeglass with positive refractive power.3rd eyeglass L3 made by glass material, and is a concave-concave eyeglass with negative refractive power.In addition, this second eyeglass L2 and the 3rd eyeglass L3 gluing form the cemented doublet L23 that has negative refractive power.
4th eyeglass L4 made by glass material, and is a biconvex eyeglass with positive refractive power.In addition, two convex surfaces S8, S9 of the 4th eyeglass L4 are all non-spherical surface.
5th eyeglass L5 made by glass material, and is a concave-concave eyeglass with negative refractive power.
And in above-mentioned eyeglass configuration, the wherein aspheric design of the negative refractive power characteristic of this first eyeglass L1, the positive refractive power characteristic of the 4th eyeglass L4 and this two eyeglass L1, L4, this microminiature imaging lens 3 can be made equally to have preferably imaging effect, effective shortening camera lens overall length and make this microminiature imaging lens 3 obtain larger angle of visibility (Field of ViewAngle, FOV).
Focal length F (Focus Length), the numerical aperture Fno (F-number) of the microminiature imaging lens 3 of third embodiment of the invention, the optical axis Z of each lens surface by the radius of curvature R (radius of curvature) at place, the thickness T (thickness) of each eyeglass on optical axis Z, the refractive index Nd (refractive index) of each eyeglass and the Abbe number Vd (Abbe number) of each eyeglass, as shown in Table 5:
Table five
In each eyeglass of the present embodiment, the surface indentation degree z of these non-spherical surfaces S1, S2, S8 and S9 obtained by following formula:
Wherein:
Z: the depression degree of non-spherical surface;
C: the inverse of radius-of-curvature;
H: the aperture radius on surface;
K: circular cone coefficient;
A ~ G: each rank coefficient of the aperture radius h on surface.
In the present embodiment, each rank coefficient A ~ G of the circular cone coefficient k (conic constant) of each non-spherical surface and surface apertures radius h is as shown in Table 6:
Table six
The eyeglass of above and aperture ST configure, and make the microminiature imaging lens 3 of the present embodiment not only effectively reduced volume to reach the demand of miniaturization, image quality also can reach requirement, this can find out from Fig. 9 A to Fig. 9 D.
Shown in Fig. 9 A, be curvature of field figure and the distortion figure of the microminiature imaging lens 3 of the present embodiment; Shown in Fig. 9 B, be the lateral light fan figure of the microminiature imaging lens 3 of the present embodiment; Shown in Fig. 9 C, be the out of focus modulation transfer function figure (Through Focus MTF) of the microminiature imaging lens 3 of the present embodiment; Shown in Fig. 9 D, be the Space Frequency Modulation transport function figure (Spatial Frequency MTF) of the microminiature imaging lens 3 of the present embodiment.
Can find out from Fig. 9 A, the maximum curvature of field of the present embodiment is no more than 0.1mm and-0.1mm, and amount of distortion is no more than 0.6%.Can find out from Fig. 9 B and Fig. 9 C, the present embodiment all has good resolution in which field positions.From Fig. 9 D, the present embodiment is the time marquis of 48lp/mm, and its modulated optical transfer function values still maintains more than 50%, and the resolution of the microminiature imaging lens of obvious the present embodiment is standard compliant.
Comprehensive above can to learn, microminiature imaging lens of the present invention not only can effectively reduced volume and while can have high optical performance.
The foregoing is only the better possible embodiments of the present invention, the equivalent structure that all application instructions of the present invention and claim are done and method for making change, ought to be included in the scope of the claims of the present invention.
Claims (16)
1. a microminiature imaging lens, is characterized in that, by being made up of along optical axis the following element of thing side to image side sequential:
First eyeglass, for having the meniscus eyeglass of negative refractive power, it is convex surface facing this thing side, and at least one side is non-spherical surface;
Second eyeglass, for having the biconvex eyeglass of positive refractive power;
3rd eyeglass, for having the concave-concave eyeglass of negative refractive power;
Aperture;
4th eyeglass, for having the biconvex eyeglass of positive refractive power, and at least one side is non-spherical surface;
5th eyeglass, for having the eyeglass of negative refractive power;
Wherein this second eyeglass and the 3rd eyeglass gluing form cemented doublet.
2. microminiature imaging lens as claimed in claim 1, it is characterized in that, this first eyeglass, this second eyeglass, the 3rd eyeglass, the 4th eyeglass and the 5th eyeglass are all made up of glass material.
3. microminiature imaging lens as claimed in claim 1, it is characterized in that, concave surface and the convex surface of this first eyeglass are all non-spherical surface.
4. microminiature imaging lens as claimed in claim 1, it is characterized in that, two convex surfaces of the 4th eyeglass are all non-spherical surface.
5. microminiature imaging lens as claimed in claim 1, it is characterized in that, this cemented doublet has positive refractive power.
6. microminiature imaging lens as claimed in claim 1, it is characterized in that, this cemented doublet has negative refractive power.
7. microminiature imaging lens as claimed in claim 1, it is characterized in that, the 5th eyeglass is crescent eyeglass, and it is convex surface facing this image side.
8. microminiature imaging lens as claimed in claim 1, it is characterized in that, the 5th eyeglass is concave-concave eyeglass.
9. a microminiature imaging lens, is characterized in that, by being made up of along optical axis the following element of thing side to image side sequential:
First eyeglass, for having the meniscus eyeglass of negative refractive power, it is convex surface facing this thing side, and at least one side is non-spherical surface;
Second eyeglass, for having the biconvex eyeglass of positive refractive power;
3rd eyeglass, for having the concave-concave eyeglass of negative refractive power;
Aperture;
4th eyeglass, for having the biconvex eyeglass of positive refractive power, and at least one side is non-spherical surface;
5th eyeglass, for having the eyeglass of negative refractive power; And
Optical filter between the 5th eyeglass and this image side, and is sheet glass;
Wherein this second eyeglass and the 3rd eyeglass gluing form cemented doublet.
10. microminiature imaging lens as claimed in claim 9, it is characterized in that, this first eyeglass, this second eyeglass, the 3rd eyeglass, the 4th eyeglass and the 5th eyeglass are all made up of glass material.
11. microminiature imaging lens as claimed in claim 9, it is characterized in that, concave surface and the convex surface of this first eyeglass are all non-spherical surface.
12. microminiature imaging lens as claimed in claim 9, is characterized in that, two convex surfaces of the 4th eyeglass are all non-spherical surface.
13. microminiature imaging lens as claimed in claim 9, it is characterized in that, this cemented doublet has positive refractive power.
14. microminiature imaging lens as claimed in claim 9, it is characterized in that, this cemented doublet has negative refractive power.
15. microminiature imaging lens as claimed in claim 9, it is characterized in that, the 5th eyeglass is crescent eyeglass, and it is convex surface facing this image side.
16. microminiature imaging lens as claimed in claim 9, it is characterized in that, the 5th eyeglass is concave-concave eyeglass.
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| CN201210061564.7A CN102854611B (en) | 2011-06-29 | 2012-03-09 | Microminiature imaging lens |
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| CN201110178901.6 | 2011-06-29 | ||
| CN201210061564.7A CN102854611B (en) | 2011-06-29 | 2012-03-09 | Microminiature imaging lens |
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| CN103064169B (en) * | 2011-10-20 | 2015-04-01 | 亚洲光学股份有限公司 | Image shooting lens |
| CN103926674B (en) * | 2013-01-11 | 2017-04-12 | 今国光学工业股份有限公司 | miniaturized lens |
| KR20180018165A (en) * | 2016-08-12 | 2018-02-21 | 삼성전자주식회사 | Optical lens assembly and electronic apparatus having the same |
| CN111929824B (en) * | 2020-09-03 | 2021-03-09 | 诚瑞光学(苏州)有限公司 | Image pickup optical lens |
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| US5528428A (en) * | 1991-11-13 | 1996-06-18 | Nikon Corporation | Compact wide-angle objective lens |
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| CN1424612A (en) * | 2001-12-14 | 2003-06-18 | 日本电产科宝株式会社 | Wide-angle lenses |
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