CN107894653B - Imaging lens - Google Patents
Imaging lens Download PDFInfo
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- CN107894653B CN107894653B CN201711448616.5A CN201711448616A CN107894653B CN 107894653 B CN107894653 B CN 107894653B CN 201711448616 A CN201711448616 A CN 201711448616A CN 107894653 B CN107894653 B CN 107894653B
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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
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
Abstract
The invention discloses a kind of imaging lens, and the first lens, the second lens, diaphragm, the third lens, the 4th lens, the 5th lens and optical filter are sequentially coaxially arranged with from object space to image space；First lens are spherical mirror, and the first power of lens is negative；Second lens are aspherical mirror, and the second power of lens is positive；The third lens are aspherical mirror, and the focal power of the third lens is positive；4th lens are spherical mirror, and the 4th power of lens is positive；5th lens are spherical mirror, and the 5th power of lens is positive；Optical filter includes the first platen surface and the second platen surface being oppositely arranged.The present invention significantly reduces the F number of imaging lens, improves the image resolution ratio of video captured by imaging lens by optimization structure appropriate；The present invention solves the problems, such as that image drift is serious by the camera lens of the small CRA of design；The present invention reduces the weight of imaging lens itself and optimizes the monovalent cost of imaging lens by using combination of different materials structure.
Description
Technical field
The present invention relates to a kind of imaging lens.
Background technique
(VR is virtual reality technology, full name in English: Virtual Reality in VR/AR interactive system；AR is enhancing
Reality technology, full name in English: Augmented Reality), the limb action of people and virtual is realized using Locating System with Binocular
The interaction of scene, Lai Tigao feeling of immersion and interactive experience.Wherein, optical imaging lens are the Primary Components of Locating System with Binocular.
The camera lens often need big FOV (field angle, full name in English: Field of View) meet space orientation tracking demand, it is short
Length improves design visual experience and falls reliability.In addition, small F number (numerical value of lens aperture size), big
Relative illumination is conducive to increase image procossing accuracy, improves binocular vision system spatial positioning accuracy and interaction real-time.This
Outside, small CRA (chief ray inclination angle, full name in English: Chief Ray Angle) angle is conducive to raising camera lens has in front
Adaptability of drifting about of practising physiognomy when bright shelter.It is currently used in the F number (number of lens aperture size of the camera lens of binocular vision system
Value) it is greater than 25 degree of mirror in 2.5 or more, CRA (chief ray inclination angle, full name in English: Chief Ray Angle) angle mostly
Head causes the brightness of image lower unintelligible, the low problem of environmental suitability.
Summary of the invention
The technical problem to be solved by the present invention is to cause figure to overcome the F number of imaging lens in the prior art larger
The lower unsharp defect of the brightness of picture, provides a kind of imaging lens.
The present invention is to solve above-mentioned technical problem by following technical proposals:
A kind of imaging lens, it is characterized in that, the imaging lens are sequentially coaxially arranged with from object space to image space:
One first lens, first lens are spherical mirror, and first power of lens is negative, first lens
Including the first spherical surface and the second spherical surface；
One second lens, second lens are aspherical mirror, and second power of lens is positive, and described second thoroughly
Mirror includes that first is aspherical and second is aspherical；
One diaphragm；
One the third lens, the third lens are aspherical mirror, and the focal power of the third lens is positive, and the third is saturating
Mirror includes that third is aspherical and the 4th is aspherical；
One the 4th lens, the 4th lens are spherical mirror, and the 4th power of lens is positive, the 4th lens
Including third spherical surface and the 4th spherical surface；
One the 5th lens, the 5th lens are spherical mirror, and the 5th power of lens is negative, the 5th lens
Including the 5th spherical surface and the 6th spherical surface；
One optical filter, the optical filter include the first platen surface and the second platen surface being oppositely arranged；
Wherein, first spherical surface, second spherical surface, the described first aspherical, described second aspherical, described light
Late, the described third is aspherical, the 4th aspherical, the described third spherical surface, the 4th spherical surface, the 5th spherical surface, described
6th spherical surface, first platen surface and second platen surface are sequentially coaxially arranged from object space to image space.
Preferably, the material of first lens, the 4th lens and the 5th lens is glass；Described second thoroughly
Mirror, the third lens material be plastics.
Preferably, the refractive index of first lens is 1.70-1.85, Abbe number 45.5-53.4；Second lens
Refractive index be 1.58-1.65, Abbe number 21.3-30.2；The refractive index of the third lens is 1.53-1.62, Abbe number
For 53.4-60.2；The refractive index of 4th lens is 1.65-1.74, Abbe number 50.4-60.7；5th lens
Refractive index is 1.73-1.85, Abbe number 21.3-30.4.
Preferably, the refractive index of first lens is 1.77, Abbe number 49.61；The refractive index of second lens
It is 1.64, Abbe number 23.9；The refractive index of the third lens is 1.54, Abbe number 55.9；The folding of 4th lens
Penetrating rate is 1.73, Abbe number 54.66；The refractive index of 5th lens is 1.84, Abbe number 23.78.
Preferably, the refractive index of the optical filter is 1.47-1.58, Abbe number 62.3-68.7.
Preferably, the absolute value of the ratio of the focal length of the focal length and imaging lens of first lens is 0.7-1.5；
The absolute value of the ratio of the focal length of the focal length and imaging lens of second lens is 6.2-7.1；
The absolute value of the ratio of the focal length of the focal length of the third lens and the imaging lens is 1.2-2.3；
The absolute value of the ratio of the focal length of the focal length and imaging lens of 4th lens is 8.7-10.5；
The absolute value of the ratio of the focal length of the focal length and imaging lens of 5th lens is 10.7-13.5.
Preferably, the 4th lens and the 5th lens are glued, wherein the 4th spherical surface of the 4th lens and institute
The 5th spherical surface for stating the 5th lens is glued, and the 4th spherical surface is identical as the radius of curvature of the 5th spherical surface.
Preferably, the radius of curvature of first spherical surface is -54.35mm, with a thickness of 0.49mm；
The radius of curvature of second spherical surface is 2.37mm, with a thickness of 0.74mm；
Described first aspherical radius of curvature is 3.27mm, with a thickness of 3.07mm；
Described second aspherical radius of curvature is 3.11mm, with a thickness of 0.23mm；
The radius of curvature of the diaphragm is ∞, with a thickness of 0.29mm；
The aspherical radius of curvature of the third is 95.28mm, with a thickness of 2.69mm；
The 4th aspherical radius of curvature is -2.21mm, with a thickness of 0.05mm；
The radius of curvature of the third spherical surface is 9.84mm, with a thickness of 2.66mm；
The radius of curvature of 4th spherical surface is -3.34mm, with a thickness of 0.49mm；
The radius of curvature of 5th spherical surface is -3.34mm, with a thickness of 0.49mm；
The radius of curvature of 6th spherical surface is -11.81mm, with a thickness of 2.28mm；
The radius of curvature of first platen surface is ∞, with a thickness of 0.21mm；
The radius of curvature of second platen surface is ∞, with a thickness of 1.64mm.
Preferably, the f-number of the imaging lens is 2.2, field angle is 165.2 degree, and CRA is less than 7.5 degree.
Preferably, second lens, the third lens are even aspheric surface mirror.
The positive effect of the present invention is that:
Imaging lens proposed by the present invention significantly reduce the F number of imaging lens by optimization structure appropriate, improve
The image resolution ratio of video captured by imaging lens；Imaging lens proposed by the present invention are solved by the camera lens of the small CRA of design
The serious problem of image drift；Also, the present invention reduces imaging lens by using glass and plastics combination of different materials structure
The weight of head itself and the monovalent cost for optimizing imaging lens.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the imaging lens of present pre-ferred embodiments.
Fig. 2 is the index path of the imaging lens of present pre-ferred embodiments.
Fig. 3 is the optical distortion curve graph of the imaging lens of present pre-ferred embodiments.
Fig. 4 is the curvature of field figure of the imaging lens of present pre-ferred embodiments.
Fig. 5 is the CRA curve graph of the imaging lens of present pre-ferred embodiments.
Fig. 6 is the MTF curve figure of the imaging lens of present pre-ferred embodiments.
Fig. 7 is the relative illumination curve graph of the imaging lens of present pre-ferred embodiments.
Description of symbols
First lens 10
First spherical surface 11
Second spherical surface 12
Second lens 20
First aspherical 21
Second aspherical 22
The third lens 30
Third aspherical 31
4th aspherical 32
4th lens 40
Third spherical surface 41
4th spherical surface 42
5th lens 50
5th spherical surface 51
6th spherical surface 52
Diaphragm 60
Optical filter 70
First platen surface 71
Second platen surface 72
Direction X
Image planes 80
Specific embodiment
A preferred embodiment is named, and completely illustrates the present invention in conjunction with attached drawing to become apparent from.
Understood incorporated by reference to Fig. 1 and Fig. 2, the implementation case provides a kind of imaging lens, and wide-angle lens is along direction X from object
Side to image space (namely image planes 80) be sequentially coaxially arranged with the first lens 10, the second lens 20, diaphragm 60, the third lens 30,
4th lens 40, the 5th lens 50 and optical filter 70.The material of first lens 10, the 4th lens 40 and the 5th lens 50 is glass
Glass；Second lens 20, the third lens 30 material be plastics.In this way, by using glass and plastics combination of different materials
Structure effectively reduces cost and lens length.
First lens 10 are spherical mirror, and the focal power of the first lens 10 is negative, and the first lens 10 include 11 He of the first spherical surface
Second spherical surface 12.Second lens 20 are aspherical mirror, and the focal power of the second lens 20 is positive, and the second lens 20 include the first aspheric
Face 21 and second aspherical 22.The third lens 30 are aspherical mirror, and the focal power of the third lens 30 is positive, and the third lens 30 include
Third aspherical 31 and the 4th aspherical 32.4th lens 40 are spherical mirror, and the focal power of the 4th lens 40 is positive, the 4th lens
40 include third spherical surface 41 and the 4th spherical surface 42.5th lens 50 are spherical mirror, and the focal power of the 5th lens 50 is negative, and the 5th thoroughly
Mirror 50 includes the 5th spherical surface 51 and the 6th spherical surface 52.Optical filter 70 includes the first platen surface 71 and the second platen surface being oppositely arranged
72.First spherical surface 11, the second spherical surface 12, first aspherical 21, second aspherical 22, diaphragm 60, third the aspherical 31, the 4th it is non-
Spherical surface 32, third spherical surface 41, the 4th spherical surface 42, the 5th spherical surface 51, the 6th spherical surface 52, the first platen surface 71 and the second platen surface 72
It is sequentially coaxially arranged from object space to image space.4th lens 40 and the 5th lens 50 are glued, wherein the 4th spherical surface of the 4th lens 40
42 and the 5th lens 50 the 5th spherical surface 51 it is glued, and the 4th spherical surface 42 is identical as the radius of curvature of the 5th spherical surface 51.Second thoroughly
Mirror 20, the third lens 30 are even aspheric surface mirror.
In the present embodiment, the refractive index of the first lens 10 is 1.70-1.85, Abbe number 45.5-53.4.Preferably,
The refractive index of first lens 10 is 1.77, Abbe number 49.61.The refractive index of second lens 20 is 1.58-1.65, and Abbe number is
21.3-30.2.Preferably, the refractive index of the second lens 20 is 1.64, Abbe number 23.9.The refractive index of the third lens 30 is
1.53-1.62 Abbe number 53.4-60.2.Preferably, the refractive index of the third lens 30 is 1.54, Abbe number 55.9.4th
The refractive index of lens 40 is 1.65-1.74, Abbe number 50.4-60.7.Preferably, the refractive index of the 4th lens 40 is 1.73,
Abbe number is 54.66.The refractive index of 5th lens 50 is 1.73-1.85, Abbe number 21.3-30.4.Preferably, the 5th lens
50 refractive index is 1.84, Abbe number 23.78.The refractive index of optical filter 70 is 1.47-1.58, Abbe number 62.3-68.7.
Preferably, the refractive index of optical filter 70 is 1.516, Abbe number 64.1.
In the present embodiment, the absolute value of the ratio of the focal length of the focal length and imaging lens of the first lens 10 is 0.7-1.5；
The absolute value of the ratio of the focal length of the focal length and imaging lens of second lens 20 is 6.2-7.1；The focal length of the third lens 30 and at
As the absolute value of the ratio of the focal length of camera lens is 1.2-2.3；The ratio of the focal length of the focal length and imaging lens of 4th lens 40
Absolute value is 8.7-10.5；The absolute value of the ratio of the focal length of the focal length and imaging lens of 5th lens 50 is 10.7-13.5.
In the present embodiment, the radius of curvature of the first spherical surface 11 is -54.35mm, with a thickness of 0.49mm.Second spherical surface 12
Radius of curvature is 2.37mm, with a thickness of 0.74mm.First aspherical 21 radius of curvature is 3.27mm, with a thickness of 3.07mm.The
Two aspherical 22 radius of curvature is 3.11mm, with a thickness of 0.23mm.The radius of curvature of diaphragm 60 is ∞, with a thickness of 0.29mm.
The radius of curvature of third aspherical 31 is 95.28mm, with a thickness of 2.69mm.4th aspherical 32 radius of curvature is -2.21mm,
With a thickness of 0.05mm.The radius of curvature of third spherical surface 41 is 9.84mm, with a thickness of 2.66mm.The radius of curvature of 4th spherical surface 42
For -3.34mm, with a thickness of 0.49mm.The radius of curvature of 5th spherical surface 51 is -3.34mm, with a thickness of 0.49mm.6th spherical surface 52
Radius of curvature be -11.81mm, with a thickness of 2.28mm.The radius of curvature of first platen surface 71 is ∞, with a thickness of 0.21mm.The
The radius of curvature of two platen surfaces 72 is ∞, with a thickness of 1.64mm.Shown in chart specific as follows:
| Title | Radius of curvature (mm) | Thickness (mm) |
| First spherical surface 11 | -54.35 | 0.49 |
| Second spherical surface 12 | 2.37 | 0.74 |
| First aspherical 21 | 3.27 | 3.07 |
| Second aspherical 22 | 3.11 | 0.23 |
| Diaphragm 60 | ∞ | 0.29 |
| Third aspherical 31 | 95.28 | 2.69 |
| 4th aspherical 32 | -2.21 | 0.05 |
| Third spherical surface 41 | 9.84 | 2.66 |
| 4th spherical surface 42 | -3.34 | 0.49 |
| 5th spherical surface 51 | -3.34 | 0.49 |
| 6th spherical surface 52 | -11.81 | 2.28 |
| First platen surface 71 | ∞ | 0.21 |
| Second platen surface 72 | ∞ | 1.64 |
Wherein, the aspherical face type formula of imaging lens are as follows:
In formula above, z be it is aspherical in optical axis direction when being highly r, apart from aspheric vertex of surface apart from rise,
C is the curvature in eyeglass face, and k is circular cone coefficient, and A, B, C, D, E, F, G, H are order aspherical coefficients.Following table is in the present embodiment
Each aspherical parameter list:
| First aspherical 21 | Second aspherical 22 | Third aspherical 31 | 4th aspherical 32 | |
| k | -1.92 | 10.82 | -3.46 | -11.357 |
| B | 0.01192 | -0.03093 | -0.0238 | 3.3955x 10-4 |
| C | 9.6863x 10-4 | -0.03651 | -0.82561 | -2.149x 10-3 |
| D | 1.3945x 10-4 | 0.0685 | 0.0148 | -5.589x 10-5 |
| E | -2.16x 10-5 | -0.09542 | 1.559x 10-3 | 7.267x 10-6 |
| F | -3.188x 10-4 | 4.681x10-3 | -2.597x 10-5 | 1.6842x 10-1 |
| G | 2.515x10-6 | -0.12418 | -1.055x 10-3 | -3.595x 10-6 |
In the present embodiment, by above-mentioned setting, the f-number for realizing imaging lens is 2.2, field angle 165.2
Degree, CRA is less than 7.5 degree.The TTL (distance of the sensitized lithography of lens plane above camera lens light hole to chip) of imaging lens
For 14.87mm, focal length 2.41mm, eyeglass maximum gauge is 6mm.
Fig. 3 is the optical distortion curve graph of the imaging lens of the present embodiment, and Fig. 4 is the curvature of field of the imaging lens of the present embodiment
Figure, it can be seen that for the curvature of field absolute value of the imaging lens in 0.03mm, distortion curve is more smooth, the figure of edge wide-angle region
It is more gentle as compressing, effectively increase the clarity of unfolded image.
Fig. 5 is the CRA curve graph of the imaging lens of the imaging lens of the present embodiment, that is, the CRA angle of imaging lens
With the relational graph of visual field, which shows the full filed CRA angle of the imaging lens within 7.5, can be effectively reduced double
The image drift problem of mesh mould group improves the Relatively orientation accuracy of Locating System with Binocular.
Fig. 6 is MTF curve figure (the MTF full name in English: Modulation Transfer of the imaging lens of the present embodiment
Function, modulation transfer function), by curve it is found that the meridian of each visual field and the MTF curve of the sagitta of arc relatively, show
The imaging consistency in meridian (T) and the sagitta of arc (S) both direction of the imaging lens is relatively good, and the MTF limit of full filed
Frequency comparison degree has reached 0.2, and the image contrast of the imaging lens is preferable.
Fig. 7 is the relative illumination curve graph of the imaging lens of the present embodiment, which contrasts in full filed range
Degree be greater than 0.9 and curve it is more smooth, show the imaging lens shooting picture entire visual field brightness of image relatively,
It is not in the darker situation in part.
Imaging lens proposed by the present invention significantly reduce the F number of imaging lens by optimization structure appropriate, improve
The image resolution ratio of video captured by imaging lens；Imaging lens proposed by the present invention are solved by the camera lens of the small CRA of design
The serious problem of image drift；Also, the present invention reduces imaging lens by using glass and plastics combination of different materials structure
The weight of head itself and the monovalent cost for optimizing imaging lens.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that this is only
For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from
Under the premise of the principle and substance of the present invention, many changes and modifications may be made, but these change and
Modification each falls within protection scope of the present invention.
Claims (9)
1. a kind of imaging lens, which is characterized in that the imaging lens are sequentially coaxially arranged with from object space to image space:
One first lens, first lens are spherical mirror, and first power of lens is negative, and first lens include
First spherical surface and the second spherical surface；
One second lens, second lens are aspherical mirror, and second power of lens is positive, the second lens packet
Include that first is aspherical and second is aspherical；
One diaphragm；
One the third lens, the third lens are aspherical mirror, and the focal power of the third lens is positive, the third lens packet
Include that third is aspherical and the 4th is aspherical；
One the 4th lens, the 4th lens are spherical mirror, and the 4th power of lens is positive, and the 4th lens include
Third spherical surface and the 4th spherical surface；
One the 5th lens, the 5th lens are spherical mirror, and the 5th power of lens is negative, and the 5th lens include
5th spherical surface and the 6th spherical surface；
One optical filter, the optical filter include the first platen surface and the second platen surface being oppositely arranged；
Wherein, first spherical surface, second spherical surface, the described first aspherical, described second aspherical, described diaphragm, institute
State aspherical third, the 4th aspherical, the described third spherical surface, the 4th spherical surface, the 5th spherical surface, the 6th ball
Face, first platen surface and second platen surface are sequentially coaxially arranged from object space to image space；
The refractive index of first lens is 1.70-1.85, Abbe number 45.5-53.4；The refractive index of second lens is
1.58-1.65 Abbe number 21.3-30.2；The refractive index of the third lens is 1.53-1.62, Abbe number 53.4-
60.2；The refractive index of 4th lens is 1.65-1.74, Abbe number 50.4-60.7；The refractive index of 5th lens is
1.73-1.85 Abbe number 21.3-30.4.
2. imaging lens as described in claim 1, which is characterized in that first lens, the 4th lens and the described 5th are thoroughly
The material of mirror is glass；Second lens, the third lens material be plastics.
3. imaging lens as described in claim 1, which is characterized in that the refractive index of first lens is 1.77, Abbe number
It is 49.61；The refractive index of second lens is 1.64, Abbe number 23.9；The refractive index of the third lens be 1.54, Ah
Shellfish number is 55.9；The refractive index of 4th lens is 1.73, Abbe number 54.66；The refractive index of 5th lens is
1.84, Abbe number 23.78.
4. imaging lens as described in claim 1, which is characterized in that the refractive index of the optical filter is 1.47-1.58, Abbe
Number is 62.3-68.7.
5. imaging lens as described in claim 1, which is characterized in that
The absolute value of the ratio of the focal length of the focal length and imaging lens of first lens is 0.7-1.5；
The absolute value of the ratio of the focal length of the focal length and imaging lens of second lens is 6.2-7.1；
The absolute value of the ratio of the focal length of the focal length of the third lens and the imaging lens is 1.2-2.3；
The absolute value of the ratio of the focal length of the focal length and imaging lens of 4th lens is 8.7-10.5；
The absolute value of the ratio of the focal length of the focal length and imaging lens of 5th lens is 10.7-13.5.
6. imaging lens as described in claim 1, which is characterized in that the 4th lens and the 5th lens are glued,
In, the 5th spherical surface of the 4th spherical surface of the 4th lens and the 5th lens is glued, and the 4th spherical surface and described the
The radius of curvature of five spherical surfaces is identical.
7. imaging lens as described in claim 1, which is characterized in that
The radius of curvature of first spherical surface is -54.35mm, with a thickness of 0.49mm；
The radius of curvature of second spherical surface is 2.37mm, with a thickness of 0.74mm；
Described first aspherical radius of curvature is 3.27mm, with a thickness of 3.07mm；
Described second aspherical radius of curvature is 3.11mm, with a thickness of 0.23mm；
The radius of curvature of the diaphragm is ∞, with a thickness of 0.29mm；
The aspherical radius of curvature of the third is 95.28mm, with a thickness of 2.69mm；
The 4th aspherical radius of curvature is -2.21mm, with a thickness of 0.05mm；
The radius of curvature of the third spherical surface is 9.84mm, with a thickness of 2.66mm；
The radius of curvature of 4th spherical surface is -3.34mm, with a thickness of 0.49mm；
The radius of curvature of 5th spherical surface is -3.34mm, with a thickness of 0.49mm；
The radius of curvature of 6th spherical surface is -11.81mm, with a thickness of 2.28mm；
The radius of curvature of first platen surface is ∞, with a thickness of 0.21mm；
The radius of curvature of second platen surface is ∞, with a thickness of 1.64mm.
8. imaging lens as described in claim 1, which is characterized in that the f-number of the imaging lens is 2.2, and field angle is
165.2 degree, CRA is less than 7.5 degree.
9. the imaging lens as described in any one of claim 1-8, which is characterized in that second lens, the third
Lens are even aspheric surface mirror.
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| CN111367041B (en) * | 2018-12-25 | 2022-11-01 | 佳能企业股份有限公司 | Optical lens |
| CN112147755B (en) * | 2019-06-27 | 2022-01-14 | 华为技术有限公司 | Optical lens group, camera and terminal equipment |
| CN114839743B (en) * | 2022-04-19 | 2023-10-10 | 拾斛科技(南京)有限公司 | Endoscope with a lens |
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| JP3723637B2 (en) * | 1996-07-03 | 2005-12-07 | ペンタックス株式会社 | Shooting lens |
| KR100457967B1 (en) * | 2003-12-08 | 2004-12-03 | 장요셉 | Optical system for ultrathin visible and infrared broadband camera |
| KR100677055B1 (en) * | 2006-07-14 | 2007-02-02 | 주식회사 디오스텍 | Small superwide angle optical system |
| JP2009047947A (en) * | 2007-08-21 | 2009-03-05 | Fujinon Corp | Imaging lens and imaging apparatus |
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