CN101339289A - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
- Publication number
- CN101339289A CN101339289A CNA2007101370025A CN200710137002A CN101339289A CN 101339289 A CN101339289 A CN 101339289A CN A2007101370025 A CNA2007101370025 A CN A2007101370025A CN 200710137002 A CN200710137002 A CN 200710137002A CN 101339289 A CN101339289 A CN 101339289A
- Authority
- CN
- China
- Prior art keywords
- eyeglass
- lens
- wide
- angle lens
- minute surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The invention discloses a wide-angle lens, which comprises a first lens, a second lens, a third lens, a fourth lens and an aperture, wherein, the first lens, the second lens, the third lens, the aperture and the fourth lens are sequentially arranged from an object side. The first lens and the second lens are negative half-meniscus lenses with the convexities facing towards the object side; the third lens and the fourth lens are lenses with two convexities. With regard to the mirror faces of the first lens, the second lens and the third lens, at least four mirror surfaces are non-spherical surfaces, and the two mirror surfaces of the fourth lens are both non-spherical surfaces. When in use, even if the visual angle is as large as 140 degrees, the wide-angle lens can avoid the extreme distortion of the peripheral parts of imaging and ensure high sharpness of imaging, thus being fairly applicable to monitor and vehicle lenses.
Description
Technical field
The present invention relates to a kind of camera lens, be specifically related to a kind of wide-angle lens.
Background technology
The maximum in design difficult problem of wide-angle lens in the past, be exactly being imaged on behind the optical effect of camera lens of object, have the puzzlement that image is distorted, and because spherical glass is only arranged in the past, for poor (or title barrel distortion is received in the negative distortion of revisal imaging, promptly be more near the edge in the imaging, image has expansion and straight-line bending becomes the phenomenon of camber line), need configuration multi-disc negative meniscus lens and positive meniscus shaped lens front end at camera lens, and 80 ° the time, need 8 to 10 eyeglass at the camera lens visual angle, at the camera lens visual angle more than 100 ° the time, need 10 to 12, this can cause the problem that the camera lens total length is oversize and weight is too heavy.
Therefore, along with the progress of optics plastic material and the manufacturing technology universalness of aspherical lens, just have many small-sized and light-weighted camera lenses to occur, especially use aspherical lens after, during 80 ° at camera lens visual angle, as long as 3 to 4 eyeglasses, during 100 ° at camera lens visual angle, as long as 4 to 5 eyeglasses, the camera lens visual angle is more than 120 ° the time, as long as 5 to 6 eyeglasses, camera lens strides forward towards small-sized and lightweight really as can be known.
In addition, as disclosed patent case: the Jap.P. spy opens the bugeye lens of 2003-307674, the Jap.P. spy opens the wide-angle lens of 2005-227426, the Jap.P. spy drives the optical devices that the wide-angle lens of 2006-146016, wide-angle lens that the Jap.P. spy opens 2006-292988 and image-taking device, Jap.P. spy open 2007-025499, its employed eyeglass quantity has been reduced to 4 to 5 really, so small-sized and lightweight is determined.
These wide-angle lens but, the problem that its image is distorted still exists, general camera lens, normally the projection mode with y '=ftan ω is the distortion that the revisal imaging is come on the basis, y ' is the image height of pixel, f is a focal length, ω is a half angle of view, other projection modes also have three-dimensional projection mode: y '=2ftan (ω/2), equidistant projection mode: y '=f ω, etc. solid angle projection mode: y '=2fsin (ω/2) and orthogonal projection mode: y '=2fsin ω, but by these formula, all can push away under fixed focal length f, increase along with visual angle and half angle of view ω, the image height y ' of pixel also can increase thereupon, when the value of y ' is too big, just can't in picture, form complete imaging, must compress its peripheral image just can be presented in the picture imaging is complete, but this just causes the image of imaging periphery to be difficult to distinguish, if be used on the monitor, may can't see convict's face because of peripheral image fog clearly, if be used on the backing-up monitoring system of automobile, may knock article or child because of peripheral image fog is ignored the driver.
Although the technology of image processing at present is quite progressive, the distortion that camera lens exists is received the technology of the available image processing of difference and is come revisal, but understand distortion unavoidably at treated image later, if can directly avoid the fuzzy defective of peripheral image compression, the development of wide-angle lens still is a slice level road.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of wide-angle lens, and this wide-angle lens can avoid extreme image to distort, and imaging has high bright acutance.
For solving the problems of the technologies described above, the technical solution of wide-angle lens of the present invention is:
Comprise four eyeglasses and aperture, is first eyeglass, second eyeglass, prismatic glasses, aperture and the 4th eyeglass by the thing side to being arranged in order as side, first eyeglass and second eyeglass are the negative half-crescent shape eyeglass of convex surface towards the thing side, prismatic glasses and the 4th eyeglass are the eyeglasses that the two sides is all convex surface, in the minute surface of other first eyeglass, second eyeglass and prismatic glasses, having four minute surfaces at least is aspheric surface, and the two sides minute surface of the 4th eyeglass is all aspheric surface, the configuration eyeglass just can reach the effect that difference is received in revisal by enough minimum eyeglass numbers like this.
And during 140 ° of this wide-angle lens at the visual angle, the light of incident can be subjected to the negative refracting power effect of first eyeglass and second eyeglass, and inject prismatic glasses with the angle that relaxes, but by the light that second eyeglass penetrates have negative distort to receive poor, non-check and accept difference and multiplying power look receipts are poor, it can come revisal by the positive refracting power of prismatic glasses and the 4th eyeglass, even so as can be known at the visual angle under 140 ° the super wide-angle condition, wide-angle lens of the present invention also can be with four eyeglasses of minimum quantity, extreme image is distorted around avoiding imaging, and imaging can have high bright acutance.
In addition, when first eyeglass is f123 to the synthetic focal length of prismatic glasses, and this wide-angle lens whole focal length will satisfy the following relationship formula when being f:
-15.0＜f
123/f＜-8.0
Because work as f
123/ f＞-8.0 o'clock, the negative refracting power of first eyeglass and second eyeglass can be too big, makes the image compression of imaging periphery excessive, just must use the technology of image processing to come revisal; Work as f
123/ f＜-15.0 o'clock are the light that imports 140 ° at visual angle, and the external diameter of first eyeglass just must relative increase, so just can promote the difficulty of camera lens miniaturization.
When the 4th eyeglass focal length is f
4The time, satisfy the following relationship formula:
-6.5＜f
123/f
4＜-3.0
Because work as f
123/ f
4＞-3.0 o'clock, the positive refracting power of the 4th eyeglass can reduce, and just the negative distortion receipts of revisal are poor fully, must use the image processing revisal; Work as f
123/ f
4＜-6.5 o'clock, the positive refracting power of the 4th eyeglass can become too high, and must increase a slice eyeglass can imaging.
When prismatic glasses is r5 near the curvature mirror radius of thing side, when being r6, satisfy the following relationship formula as the curvature mirror radius of side:
0.6＜(r6+r5)/(r6-r5)＜1.0
Because (r6+r5)/(r6-r5)＞1.0 o'clock, the radius-of-curvature of thing side can diminish, and receives on the difference helpfully though distort in revisal, receives the revisal effect of difference and reduces on the contrary at non-difference and the comet aberration checked and accepted, and makes the bright acutance reduction of image of imaging; When (r6+r5)/(r6-r5)＜0.6, it is poor just can't to reach the distortion receipts that need revisal.
When the 4th eyeglass is r8 near the curvature mirror radius of thing side, when being r9, satisfy the following relationship formula as the curvature mirror radius of side:
-0.55＜(r9+r8)/(r9-r8)＜-0.45
Because (r9+r8)/(r9-r8)＞-0.45 o'clock, sphere is received the revisal meeting deficiency of difference; When (r9+r8)/(r9-r8)＜-0.55, it is too much that sphere is received poor revisal meeting, and the bright acutance of image of picture central authorities imaging can become very low.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Figure 1A is the structural representation of first embodiment of the invention;
Figure 1B is first embodiment of the invention sphere, non-point and distorts the synoptic diagram of receiving difference;
Fig. 2 A is the structural representation of second embodiment of the invention;
Fig. 2 B is second embodiment of the invention sphere, non-point and distorts the synoptic diagram of receiving difference;
Fig. 3 A is the structural representation of third embodiment of the invention;
Fig. 3 B is third embodiment of the invention sphere, non-point and distorts the synoptic diagram of receiving difference;
Fig. 4 A is the structural representation of fourth embodiment of the invention;
Fig. 4 B is fourth embodiment of the invention sphere, non-point and distorts the synoptic diagram of receiving difference;
Fig. 5 A is the structural representation of fifth embodiment of the invention;
Fig. 5 B is fifth embodiment of the invention sphere, non-point and distorts the synoptic diagram of receiving difference;
Fig. 6 A is the structural representation of sixth embodiment of the invention;
Fig. 6 B is sixth embodiment of the invention sphere, non-point and distorts the synoptic diagram of receiving difference;
Fig. 7 A is the structural representation of seventh embodiment of the invention;
Fig. 7 B is seventh embodiment of the invention sphere, non-point and distorts the synoptic diagram of receiving difference;
Among the figure, 1 first eyeglass, 2 second eyeglasses, 3 prismatic glasseses, 4 the 4th eyeglasses, 5 apertures, 6 filter discs, 7 cloches, 8 imaging surfaces.
Embodiment
The embodiment of wide-angle lens of the present invention such as Fig. 1 are to shown in Figure 7, and it is used in particular for the about 140 ° camera lens in visual angle, can be applicable on monitor or the automobile.This wide-angle lens is first eyeglass 1 by the thing side to being arranged in order as side, second eyeglass 2, prismatic glasses 3, aperture 5, the 4th eyeglass 4, filter disc 6, cloche 7 and imaging surface 8, wherein: first eyeglass 1 is the negative half-crescent shape eyeglass of convex surface towards the thing side, second eyeglass 2 is the negative half-crescent shape eyeglass of convex surface towards the thing side, prismatic glasses 3 is all the eyeglass of convex surface for the two sides, the 4th eyeglass 4 is all the eyeglass of convex surface for the two sides, four eyeglasses 1,2,3,4 are all plastic material to save material cost, other first eyeglass 1, in the minute surface of second eyeglass 2 and prismatic glasses 3, having four minute surfaces at least is aspheric minute surface, and two minute surfaces of the 4th eyeglass are all aspheric minute surface, filter disc 6 and cloche 7 all are made of flat glass, filter disc 6 is in order to intercept infrared ray, and cloche 7 is arranged at imaging surface 8 with members such as protection CCD or CMOS;
And in an embodiment, inject this wide-angle lens with L1 (0 ° of incident angle), L2 (21 ° of incident angles), L3 (35 ° of incident angles), L4 (42 ° of incident angles), L5 (49 ° of incident angles), L6 (56 ° of incident angles), L7 (63 ° of incident angles), L8 eight kinds of angle of incidence of light degree such as (70 ° of incident angles) respectively, and image on the imaging surface 8, and as seen from the figure, the peripheral image of imaging does not have extreme compression, and can the more complete and imaging correctly of moulding, and imaging has more high bright acutance.
And Figure 1B to Fig. 7 B is the receipts difference figure corresponding to Figure 1A to Fig. 7 A, wherein (a) receives the curve map of difference for sphere, it is poor that wherein C line, d line, e line, F line and g line are represented the sphere receipts of different wavelengths of light respectively, unit is mm, (b) be the non-poor curve map of checking and accepting, the non-difference size of checking and accepting of expression different wavelengths of light, unit is mm, and S represents the receipts of level poor, and T represents vertical receipts poor, (c) for distorting the curve maps of receiving difference, the difference size is received in the distortion of expression different wavelengths of light, unit is %, as seen from the figure, this wide-angle lens with the revisal of various receipts difference to being enough to practical degree.
In following each embodiment, the focal length of this wide-angle lens integral body is f, and f-number is F NO., the visual angle is 2 ω, and is begun by the thing side, with each minute surface number consecutively of this wide-angle lens, the minute surface of first eyeglass 1 is S1, S2, the minute surface of second eyeglass 2 is S3, S4, and the minute surface of prismatic glasses 3 is S5, S6, and the minute surface of aperture 5 is S7, the minute surface of the 4th eyeglass 4 is S8, S9, the minute surface of filter disc 6 is S10, S11, and the minute surface of cloche 7 is S12, S13, and the formula of aspherical mirror is:
X＝(1/R)H
2/{1+[1-(1+K)(H/R)
2]
1/2}+AH
4+BH
6+CH
8+DH
10
A, B, C, D are asphericity coefficient, and H is the height that optical axis begins, and X is the displacement of optical axis direction, and X is the basis of vertex of surface, and R is paraxial radius-of-curvature, and K is the circular cone coefficient, and E represents scientific notation in the coefficient, represents 10 as E-03
-3
In the embodiment of Figure 1A, f is 0.868mm, and F NO. is that 2.8,2 ω are 140 °, and the radius-of-curvature r of each minute surface (mm of unit), face at interval d (mm of unit), flexion rate nd and contrary dispersion rate vd such as following table 1A as showing:
| r | d | nd | vd | |
| S1 | 37.482 | 1.658 | 1.53 | 56.3 |
| S2 | 5.1 | 2.481 | ||
| S3 | 13.033 | 0.703 | 1.53 | 56.3 |
| S4 | 1.3516 | 1.098 | ||
| S5 | 3.094 | 3.316 | 1.63 | 23.4 |
| S6 | -50.05 | 1.076 | ||
| S7 | ∞ | 0.768 | ||
| S8 | 3.6223 | 2.668 | 1.53 | 56.3 |
| S9 | -1.084 | 0.549 | ||
| S10 | ∞ | 0.3 | BSC7 | |
| S11 | ∞ | 0.22 | ||
| S12 | ∞ | 0.4 | BSC7 | |
| S13 | ∞ |
Table 1A
Table 1B is depicted as the asphericity coefficient of each minute surface, and except the minute surface S1 of first eyeglass 1 is the sphere minute surface, minute surface S3, S4, S5, S6, S8, the S9 of the minute surface S2 of first eyeglass 1 and other eyeglass 2,3,4 are all aspherical mirror, and shown in the following tabulation of the numerical value of K, A, B, C, the D 1B:
And in the present embodiment, four eyeglasses 1,2,3,4 are all made by plastic cement, and filter disc 6 and cloche 7 are made for colouless optical glass (BSC7).
In the embodiment of Fig. 2 A, f is 0.881mm, and F NO. is that 2.8,2 ω are 140 °, and the radius-of-curvature r of each minute surface (mm of unit), face d (mm of unit), flexion rate nd at interval reach shown in the contrary following tabulation of the dispersion rate vd 2A:
| r | D | nd | vd | |
| S1 | 30.933 | 1.319 | 1.53 | 56.3 |
| S2 | 4.6259 | 2.167 | ||
| S3 | 24.701 | 0.598 | 1.53 | 56.3 |
| S4 | 1.3649 | 1.086 | ||
| S5 | 3.0326 | 3.003 | 1.63 | 23.4 |
| S6 | -23.66 | 0.977 | ||
| S7 | ∞ | 0.847 | ||
| S8 | 3.7781 | 2.36 | 1.53 | 56.3 |
| S9 | -1.12 | 0.5 | ||
| S10 | ∞ | 0.3 | BSC7 | |
| S11 | ∞ | 0.2 | ||
| S12 | ∞ | 0.4 | BSC7 | |
| S13 | ∞ |
Table 2A
The 2B that tabulates down is the asphericity coefficient of each minute surface, minute surface S1 except first eyeglass 1 among this embodiment is the sphere minute surface, minute surface S3, S4, S5, S6, S8, the S9 of its minute surface S2 and other eyeglass 2,3,4 are all aspherical mirror, and among this embodiment, four eyeglasses 1,2,3,4 are all made by plastic cement, and filter disc 6 and cloche 7 are made for colouless optical glass (BSC7).
In the embodiment of Fig. 3 A, f is 0.885mm, and F NO. is that 2.8,2 ω are 140 °, and the radius-of-curvature r of each minute surface (mm of unit), face d (mm of unit), flexion rate nd at interval reach shown in the contrary following tabulation of the dispersion rate vd 3A:
| r | d | nd | vd | |
| S1 | 38.075 | 1.658 | BSC7 | |
| S2 | 4.1006 | 2.481 | ||
| S3 | 2.6583 | 0.703 | 1.53 | 56.3 |
| S4 | 0.9793 | 1.098 | ||
| S5 | 3.0961 | 3.316 | 1.63 | 23.4 |
| S6 | -139.7 | 1.076 | ||
| S7 | ∞ | 0.768 | ||
| S8 | 3.3993 | 2.668 | 1.53 | 56.3 |
| S9 | -1.104 | 0.549 | ||
| S10 | ∞ | 0.3 | BSC7 | |
| S11 | ∞ | 0.22 | ||
| S12 | ∞ | 0.4 | BSC7 | |
| S13 | ∞ |
Table 3A
The 3B that tabulates down is depicted as the asphericity coefficient of each minute surface, and minute surface S3, S4, S5, S6, S8, the S9 of this prismatic glasses 2,3,4 are all aspherical mirror among this embodiment:
| S3 | S4 | S5 | |||
| K | -8.3267 | K | -1.8369 | K | -0.0685 |
| A | -4.5736E-04 | A | 0.018663 | A | 4.67170E-03 |
| B | 1.5069E-04 | B | -2.0060E-03 | B | -7.8960E-04 |
| C | -6.8544E-06 | C | 7.20489E-06 | C | 7.92671E-06 |
| D | 2.8798E-07 | D | 2.5550E-06 | D | 0.0000 |
| S6 | S8 | S9 | |||
| K | 0.0000 | K | -17.4520 | K | -2.1555 |
| A | 6.48199E-03 | A | 1.0251E-02 | A | -1.6781E-02 |
| B | 3.0247E-03 | B | -9.9380E-04 | B | 2.7050E-03 |
| C | -1.1447E-04 | C | -1.0893E-04 | C | 4.99743E-04 |
| D | 0.0000 | D | -1.1820E-05 | D | -1.2380E-04 |
Table 3B
And among this embodiment, these three eyeglasses 2,3,4 are all made by plastic cement, and first eyeglass 1, filter disc 6 and cloche 7 are made for colouless optical glass (BSC7).
In the embodiment of Fig. 4 A, f is 0.996mm, and F NO. is that 2.8,2 ω are 140 °, and the radius-of-curvature r of each minute surface (mm of unit), face d (mm of unit), flexion rate nd at interval reach contrary dispersion rate vd shown in following table 4A:
| r | D | nd | vd | |
| S1 | 33.156 | 1.042 | 1.53 | 56.3 |
| S2 | 4.6052 | 2.11 | ||
| S3 | 192.48 | 0.599 | 1.53 | 56.3 |
| S4 | 1.502 | 1.075 | ||
| S5 | 3.0814 | 3 | 1.63 | 23.4 |
| S6 | -15.93 | 0.977 | ||
| S7 | ∞ | 0.94 | ||
| S8 | 3.5563 | 2.571 | 1.53 | 56.3 |
| S9 | -1.256 | 0.5 | ||
| S10 | ∞ | 0.3 | BSC7 | |
| S11 | ∞ | 0.2 | ||
| S12 | ∞ | 0.4 | BSC7 | |
| S13 | ∞ |
Table 4A
The 4B that tabulates down is the asphericity coefficient of each minute surface, and the minute surface S1 except first eyeglass 1 among this embodiment is the sphere minute surface, and minute surface S3, S4, S5, S6, S8, the S9 of its minute surface S2 and other eyeglass 2,3,4 are all aspherical mirror.
And among this embodiment, four eyeglasses 1,2,3,4 are all made by plastic cement, and filter disc 6 and cloche 7 are made for colouless optical glass (BSC7).
In the embodiment of Fig. 5 A, f is 0.987mm, and F NO. is that 2.8,2 ω are 140, and the radius-of-curvature r of each minute surface (mm of unit), face d (mm of unit), flexion rate nd at interval reach shown in the contrary following tabulation of the dispersion rate vd 5A.
| r | D | nd | vd | |
| S1 | 31.011 | 0.97 | 1.53 | 56.3 |
| S2 | 4.609 | 2.093 | ||
| S3 | 46.207 | 0.599 | 1.53 | 56. 3 |
| S4 | 1.4464 | 1.128 | ||
| S5 | 3.4039 | 3.001 | 1.69 | 22. 5 |
| S6 | -19.37 | 0.977 | ||
| S7 | ∞ | 0.926 | ||
| S8 | 3.6273 | 2.588 | 1.53 | 56.3 |
| S9 | -1.255 | 0.5 | ||
| S10 | ∞ | 0.3 | BSC7 | |
| Sll | ∞ | 0.2 | ||
| S12 | ∞ | 0.4 | | |
| S1 | ||||
| 3 | ∞ |
Table 5A
The 5B that tabulates down is the asphericity coefficient of each minute surface, minute surface S1 except first eyeglass 1 among this embodiment is the sphere minute surface, minute surface S3, S4, S5, S6, S8, the S9 of its minute surface S2 and other eyeglass 2,3,4 are all aspherical mirror, and among this embodiment, four eyeglasses 1,2,3,4 are all made by plastic cement, and filter disc 6 and cloche 7 are made for colouless optical glass (BSC7).
In the embodiment of Fig. 6 A, f is 1.003mm, and F NO. is that 2.8,2 ω are 140 °, and the radius-of-curvature r of each minute surface (mm of unit), face d (mm of unit), flexion rate nd at interval reach shown in the contrary following tabulation of the dispersion rate vd 6A:
| r | D | nd | vd | |
| S1 | 30.758 | 0.924 | 1.53 | 56.3 |
| S2 | 4.6101 | 2.706 | ||
| S3 | 185.22 | 0.601 | 1.53 | 56.3 |
| S4 | 1.5407 | 1.161 | ||
| S5 | 3.5803 | 3.002 | 1.72 | 22.1 |
| S6 | -25.46 | 0.977 | ||
| S7 | ∞ | 0.922 | ||
| S8 | 3.6996 | 2.6 | 1.53 | 56.3 |
| S9 | -1.26 | 0.5 | ||
| S10 | ∞ | 0.3 | BSC7 | |
| S11 | ∞ | 0.2 | ||
| S12 | ∞ | 0.4 | BSC7 | |
| S13 | ∞ |
Table 6A
The 6B that tabulates down is the asphericity coefficient of each minute surface, and the minute surface S1 except first eyeglass 1 among this embodiment is the sphere minute surface, and minute surface S3, S4, S5, S6, S8, the S9 of its minute surface S2 and other eyeglass 2,3,4 are all aspherical mirror.
And among this embodiment, four eyeglasses 1,2,3,4 are all made by plastic cement, and filter disc 6 and cloche 7 are made for colouless optical glass (BSC7).
In the embodiment of Fig. 7 A, f is 0.819mm, and F NO. is that 2.8,2 ω are 140 °, and the radius-of-curvature r of each minute surface (mm of unit), face d (mm of unit), flexion rate nd at interval reach shown in the contrary following tabulation of the dispersion rate vd 7A.
| r | d | nd | vd | |
| S1 | 38.075 | 1.658 | BSC7 | |
| S2 | 4.1516 | 2.481 | ||
| S3 | 3.8988 | 0.703 | 1.53 | 56.3 |
| S4 | 1.0926 | 1.098 | ||
| S5 | 3.0394 | 3.316 | 1.63 | 23.4 |
| S6 | -139.7 | 1.076 | ||
| S7 | ∞ | 0.768 | ||
| S8 | 3.4666 | 2.668 | 1.53 | 56.3 |
| S9 | -1.051 | 0.549 | ||
| S10 | ∞ | 0.3 | BSC7 | |
| S11 | ∞ | 0.22 | ||
| S12 | ∞ | 0.4 | BSC7 | |
| S13 | ∞ |
Table 7A
The 7B that tabulates down is depicted as the asphericity coefficient of each minute surface, and minute surface S3, S4, S5, S6, S8, the S9 of three eyeglasses 2,3,4 are all aspherical mirror among this embodiment:
| S3 | S4 | S5 | |||
| K | -26.1724 | K | -2.30334 | K | 0.068542 |
| A | -4.1612E-04 | A | 0.025581 | A | 2.20443E-03 |
| B | 1.9828E-04 | B | -2.5630E-03 | B | -1.4690E-04 |
| C | -1.0493E-05 | C | 8.76466E-05 | C | -1.3458E-05 |
| D | 5.6127E-07 | D | 2.3923E-05 | D | 0.0000 |
| S6 | S8 | S9 | |||
| K | 0.0000 | K | -23.5699 | K | -2.22357 |
| A | 9.60776E-0 3 | A | 1.2804E-02 | A | -3.0414E-02 |
| B | -2.8160E-04 | B | 1.1178E-03 | B | 4.7420E-03 |
| C | -3.1147E-04 | C | -6.9335E-04 | C | 1.25882E-03 |
| D | 0.0000 | D | -5.2700E-05 | D | -2.6640E-04 |
Table 7B
And among this embodiment, three eyeglasses 2,3,4 are all made by plastic cement, and first eyeglass 1, filter disc 6 and cloche 7 are made for colouless optical glass (BSC7).
By as can be known aforementioned, this wide-angle lens is made up of four eyeglasses 1,2,3,4, and the light of injecting is adjusted the incident angle of light earlier successively via first eyeglass 1 and second eyeglass 2, it is more relaxed, light just is incident to prismatic glasses 3 then, but the light by second eyeglass 2 still has very big negative distortion to receive poor, non-difference and the multiplying power look checked and accepted to receive poorly, so be f at first eyeglass to the synthetic focal length of prismatic glasses
123, and this wide-angle lens whole focal length must satisfy the following relationship formula when being f:
Relational expression 1:-15.0＜f
123/ f＜-8.0
Because work as f
123/ f＞-8.0 o'clock, the negative refracting power of first eyeglass and second eyeglass is too big, makes the image compression of imaging periphery excessive, just must use the technology of image processing to come revisal; Work as f
123/ f＜-15.0 o'clock are the light that imports 140 ° at visual angle, and the external diameter of first eyeglass just must increase relatively, so just can promote the difficulty of camera lens miniaturization.
When the 4th eyeglass focal length is f
4The time, satisfy the following relationship formula:
Relational expression 2:-6.5＜f
123/ f
4＜-3.0
Because work as f
123/ f
4＞-3.0 o'clock, the positive refracting power of the 4th eyeglass can reduce, and just the negative distortion receipts of revisal are poor fully, must make the image processing revisal; Work as f
123/ f
4＜-6.5 o'clock, the positive refracting power of the 4th eyeglass can become too high, and must increase a slice eyeglass can imaging, but serve as the basic positive refracting power that determines prismatic glasses 3 with relational expression 1, just can solve foregoing problems.
And when prismatic glasses is r5 near the curvature mirror radius of thing side, when being r6, satisfy the following relationship formula as the curvature mirror radius of side:
Relational expression 3:0.6＜(r6+r5)/(r6-r5)＜1.0
Because (r6+r5)/(r6-r5)＞1.0 o'clock, the radius-of-curvature of thing side can diminish, and receives on the difference helpfully though distort in revisal, receives the revisal effect of difference and reduces on the contrary at non-difference and the comet aberration checked and accepted, and makes the bright acutance reduction of image of imaging; When (r6+r5)/(r6-r5)＜0.6, it is poor just can't to reach the distortion receipts that need revisal.
Because light can be incident to 4 imagings of the 4th eyeglass after first eyeglass 1, second eyeglass 2 and prismatic glasses 3 refractions, the 4th eyeglass 4 is the main eyeglass of this wide-angle lens imaging as can be known, so the following relationship formula can determine the shape of the 4th eyeglass 4, when the 4th eyeglass is r8 near the curvature mirror radius of thing side, when being r9, satisfy the following relationship formula as the curvature mirror radius of side:
Relational expression 4:-0.55＜(r9+r8)/(r9-r8)＜-0.45
Because (r9+r8)/(r9-r8)＞-0.45 o'clock, sphere is received the revisal meeting deficiency of difference; When (r9+r8)/(r9-r8)＜-0.55, it is too much that sphere is received poor revisal meeting, and the bright acutance of image of picture central authorities imaging can become very low;
So meet the 4th eyeglass 4 of relational expression 4, along with its two minute surface is all aspheric characteristic, it is complete to be held in the middle and peripheral image definition of picture.
And the following tabulation 8 of the numerical value embodiment that meets aforementioned each relational expression:
| Embodiment 1 | |
|
|
|
|
Embodiment 7 | |
| f 123/f | -9.42 | -10.7 | -8.25 | -13.7 | -12.2 | -11.6 | -8.47 |
| f 123/f 4 | -4.14 | -4.77 | -3.66 | -6.28 | -5.53 | -5.31 | -3.60 |
| (r6+r5)/(r6-r5) | 0.88 | 0.77 | 0.96 | 0.68 | 0.70 | 0.75 | 0.96 |
| (r9+r8)/(r9-r8) | -0.54 | -0.54 | -0.51 | -0.48 | -0.49 | -0.49 | -0.53 |
Table 8
As can be known, even this wide-angle lens visual angle up to 140 °, only uses four eyeglasses just can avoid the part of imaging periphery extremely to distort, and can make imaging have high bright acutance, so quite be applicable to monitor and automobile-used camera lens.
Claims (6)
1, a kind of wide-angle lens comprises first eyeglass, second eyeglass, prismatic glasses, the 4th eyeglass and aperture, it is characterized in that:
Begin by the thing side, described first eyeglass, second eyeglass, prismatic glasses, aperture and the 4th eyeglass are arranged in order setting, described first eyeglass and second eyeglass are all the negative half-crescent shape eyeglass of convex surface towards the thing side, and described prismatic glasses and the 4th eyeglass all are the eyeglasses that the two sides is all convex surface;
In the minute surface of described first eyeglass, second eyeglass and prismatic glasses, having four minute surfaces at least is aspheric surface, and the two sides minute surface of described the 4th eyeglass is all aspheric surface.
2, wide-angle lens as claimed in claim 1 is characterized in that, described first eyeglass is f to the synthetic focal length of prismatic glasses
123, this wide-angle lens whole focal length is f, and-15.0＜f
123/ f＜-8.0.
3, wide-angle lens as claimed in claim 1 is characterized in that, described first eyeglass is f to the synthetic focal length of prismatic glasses
123, described the 4th eyeglass focal length is f
4, and-6.5＜f
123/ f
4＜-3.0.
4, wide-angle lens as claimed in claim 1 is characterized in that, described first eyeglass is f to the synthetic focal length of prismatic glasses
123, described the 4th eyeglass focal length is f
4, this wide-angle lens whole focal length is f, and-15.0＜f
123/ f＜-8.0 ,-6.5＜f
123/ f
4＜-3.0.
5, wide-angle lens as claimed in claim 1 is characterized in that, described prismatic glasses is r5 near the curvature mirror radius of thing side, and the curvature mirror radius of opposite side is r6, and 0.6＜(r6+r5)/(r6-r5)＜1.0.
6, wide-angle lens as claimed in claim 1 is characterized in that, described the 4th eyeglass is r8 near the curvature mirror radius of thing side, and the curvature mirror radius of opposite side is r9, and-0.55＜(r9+r8)/(r9-r8)＜-0.45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101370025A CN101339289B (en) | 2007-07-02 | 2007-07-02 | Wide-angle lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101370025A CN101339289B (en) | 2007-07-02 | 2007-07-02 | Wide-angle lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101339289A true CN101339289A (en) | 2009-01-07 |
| CN101339289B CN101339289B (en) | 2010-08-11 |
Family
ID=40213396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101370025A Active CN101339289B (en) | 2007-07-02 | 2007-07-02 | Wide-angle lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101339289B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101561547B (en) * | 2009-05-22 | 2011-05-04 | 宁波舜宇车载光学技术有限公司 | Novel low-cost vehicle backing backsight wide angle lens |
| CN104035185A (en) * | 2014-04-30 | 2014-09-10 | 信华精机有限公司 | High-definition wide-angle small-distortion reversing lens |
| JP2017134358A (en) * | 2016-01-29 | 2017-08-03 | 日立マクセル株式会社 | Imaging lens system and imaging apparatus |
| JP2017134359A (en) * | 2016-01-29 | 2017-08-03 | 日立マクセル株式会社 | Imaging lens system and imaging apparatus |
| JP2020030443A (en) * | 2019-11-28 | 2020-02-27 | マクセル株式会社 | Image capturing lens system and image capturing device |
| CN111726488A (en) * | 2020-05-29 | 2020-09-29 | 深圳市伯森光电科技有限公司 | Optical system |
| JP2020170205A (en) * | 2020-07-22 | 2020-10-15 | マクセル株式会社 | Image capturing lens system and image capturing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2831168Y (en) * | 2005-09-08 | 2006-10-25 | 南阳市卧龙光学有限公司 | Orthostig met |
-
2007
- 2007-07-02 CN CN2007101370025A patent/CN101339289B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101561547B (en) * | 2009-05-22 | 2011-05-04 | 宁波舜宇车载光学技术有限公司 | Novel low-cost vehicle backing backsight wide angle lens |
| CN104035185A (en) * | 2014-04-30 | 2014-09-10 | 信华精机有限公司 | High-definition wide-angle small-distortion reversing lens |
| JP2017134358A (en) * | 2016-01-29 | 2017-08-03 | 日立マクセル株式会社 | Imaging lens system and imaging apparatus |
| JP2017134359A (en) * | 2016-01-29 | 2017-08-03 | 日立マクセル株式会社 | Imaging lens system and imaging apparatus |
| JP2020030443A (en) * | 2019-11-28 | 2020-02-27 | マクセル株式会社 | Image capturing lens system and image capturing device |
| CN111726488A (en) * | 2020-05-29 | 2020-09-29 | 深圳市伯森光电科技有限公司 | Optical system |
| JP2020170205A (en) * | 2020-07-22 | 2020-10-15 | マクセル株式会社 | Image capturing lens system and image capturing device |
| JP6997265B2 (en) | 2020-07-22 | 2022-02-04 | マクセル株式会社 | Imaging lens system and imaging device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101339289B (en) | 2010-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105974561B (en) | Wide-angle camera | |
| CN106199922B (en) | Seven chip wide-angle lens | |
| CN104793318B (en) | Photographing optical lens, image capturing device and vehicular photographing device | |
| CN202886721U (en) | Wide-angle optical lens assembly | |
| CN202443161U (en) | Image lens assembly | |
| CN202149966U (en) | Image capturing lens assembly | |
| CN103576285B (en) | Optical image capturing lens assembly | |
| CN202710833U (en) | Optical image lens system | |
| CN202533645U (en) | optical lens | |
| CN202661703U (en) | Optical imaging lens system | |
| CN101339289B (en) | Wide-angle lens | |
| CN103792646A (en) | Optical photographing system set | |
| CN103309014A (en) | Optical image system set | |
| CN103676084A (en) | Single focus camera lens group | |
| CN102937740A (en) | Optical image capturing lens assembly | |
| CN102466867A (en) | Optical camera lens group | |
| CN201852987U (en) | Image capture lens set with wide viewing angle | |
| CN102566013B (en) | Optical photographing system | |
| CN103323930A (en) | camera lens system | |
| CN107894652A (en) | A kind of small aberration optical lens of large aperture | |
| CN103221867B (en) | Optical unit and image pick up equipment | |
| CN106054357A (en) | Ultra-wide field small distortion vehicle lens optical system | |
| CN108051899A (en) | Pick-up lens | |
| CN109557635B (en) | Optical lens | |
| CN205958831U (en) | On -vehicle optical lens system of little distortion of super wide angle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |