CN105700118A - Five-piece imaging lens group - Google Patents
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- CN105700118A CN105700118A CN201410695477.6A CN201410695477A CN105700118A CN 105700118 A CN105700118 A CN 105700118A CN 201410695477 A CN201410695477 A CN 201410695477A CN 105700118 A CN105700118 A CN 105700118A
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Abstract
The invention discloses a five-piece imaging lens group comprising a fixed diaphragm and an optical lens group. The optical lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens along an optical axis. The first lens has negative refractive power near the optical axis, and the image-side optical surface thereof is concave. The second lens has negative refractive power near the optical axis. The third lens has positive refractive power near the optical axis, and both the object-side optical surface and the image-side optical surface thereof are convex. The fourth lens has positive refractive power near the optical axis, and the object-side optical surface thereof is convex. The fifth lens has negative refractive power near the optical axis, and the image-side optical surface thereof is convex. There is an air gap length between the image-side optical surface of the fourth lens and the object-side optical surface of the fifth lens.
Description
Technical field
The present invention relates to a kind of imaging lens group, particularly to a kind of ultra-wide angle five chip imaging lens group being suitably applied electronic product。
Background technology
Recent years, rise along with the electronic product with capture function, the demand of miniaturization photographic lens day by day improves, and generally the photosensory assembly of photographic lens is nothing more than being photosensitive coupling component (ChargeCoupledDevice) or Complimentary Metal-Oxide semiconductor subassembly (CMOSsensor) two kinds, and progressing greatly along with semiconductor processing technology, the Pixel Dimensions making photosensory assembly reduces, miniaturization photographic lens develops toward high pixel neighborhoods gradually, therefore, the requirement of sense picture element amount is also increased day by day。
In the optical frames group design of five lens type fixed focal lengths of various miniaturizations, prior art is with the lens combination of different plus or minus refractive powers, such as, utilize the 4th lens of negative refractive power and the 5th lens configuration of negative refractive power, can increase back focal length and the total length of optical image capture, but the more difficult shortening of total length easily causing optical system。
Summary of the invention
Therefore, the purpose of the embodiment of the present invention is in that, it is provided that a kind of technology, it is possible to effective total length shortening optical frames group efficient combination multiple lens are to improve the quality of imaging further。
According to object of the invention it is proposed a kind of five chip imaging lens groups, comprise: fixed aperture；Optical frames group, is sequentially comprised the first lens along optical axis by thing side to image side, and the image side optical surface that the first lens have negative refractive power and the first lens at close optical axis place is concave surface；Second lens, the second lens have negative refractive power near optical axis place；3rd lens, the 3rd lens have positive refractive power near optical axis place, and the image side optical surface that thing side optical surface is convex surface and the 3rd lens of the 3rd lens is convex surface；4th lens, the thing side optical surface that the 4th lens have positive refractive power and the 4th lens at close optical axis place is convex surface；And the 5th lens, the 5th lens are convex surface having the image side optical surface of negative refractive power and the 5th lens near optical axis place, and wherein the image side optical surface of the 5th lens is aspheric surface；Wherein between image side optical surface and the thing side optical surface of the 5th lens of the 4th lens, there is Air space length。
Preferably, the image side optical surface of the 4th lens is T45 to the Air space length of the maximum horizontal displacement of the optics effective diameter position of the thing side optical surface of the 5th lens, meets relationship below: T45 > 0.01mm。
Preferably, the image side optical surface of the 4th lens intersection point on optical axis is Sag4 to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface of the 4th lens, the thing side optical surface of the 5th lens intersection point on optical axis is Sag5 to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the thing side optical surface of the 5th lens, meets following relationship: 0.8 < | Sag4 |/| Sag5 | < 1.4。
Preferably, the image side optical surface of the 5th lens has at least one point of inflexion。
Preferably, the image side optical surface of the 5th lens is HI near the point of inflexion of optical axis and the vertical dimension of light between centers, meets following relationship: 0mm≤HI≤1mm。
Preferably, the image side optical surface of the 5th lens intersection point on optical axis is DR to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface of the 5th lens, meets following relationship: 0mm≤DR≤0.5mm。
Preferably, the five chip imaging lens groups of the present invention also comprise aperture and imaging surface；Wherein on optical axis, aperture is AT to the distance of imaging surface, and the thing side optical surface of the first lens is OT to the distance of imaging surface, meets following relationship: 0.5≤AT/OT≤0.8。
Preferably, the maximum use visual angle of five chip imaging lens groups is FOV, meets following relationship: FOV > 90 °。
Preferably, first lens are Vd1 at the abbe number of spectrum 587.6nm, second lens are Vd2 at the abbe number of spectrum 587.6nm, 3rd lens are Vd3 at the abbe number of spectrum 587.6nm, 4th lens are Vd4 at the abbe number of spectrum 587.6nm, 5th lens are Vd5 at the abbe number of spectrum 587.6nm, meet following relationship: Vd1+Vd2+Vd3+Vd4 > 6Vd5。
Preferably, on optical axis, the thickness summation of the lens of all tool refracting powers is Σ CT, is TT from the thing side optical surface of the first lens to the distance of the image side optical surface of the 5th lens, meets following relationship: 0.5≤Σ CT/TT≤0.85。
Preferably, the focal length of optical frames group is f, and the image side optical surface of the first lens is T12 to distance on optical axis of the thing side optical surface of the second lens, meets following relationship: 0.3≤T12/f≤0.7。
Preferably, the five chip imaging lens groups of the present invention also comprise imaging surface；Wherein on optical axis, the thing side optical surface of the first lens is TT to the distance of the image side optical surface of the 5th lens, and the thing side optical surface of the first lens is OT to the distance of imaging surface, meets following relationship: 0.5≤TT/OT≤0.7。
Preferably, on optical axis, the image side optical surface of the first lens is T12 to the distance of the thing side optical surface of the second lens, and the thickness of the first lens and the second lens respectively CT1 and CT2 meets following relationship: 2.0≤(CT2+T12)/CT1≤6.0。
Preferably, the maximum use visual angle of five chip imaging lens groups is FOV, meets following relationship: 90 ° < FOV < 180 °。
Preferably, the 5th lens thickness on optical axis is CT5, meets following relationship: 0 < DR/CT5 < 0.3。
Preferably, the image side optical surface of the 5th lens intersection point on optical axis is DR to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface of the 5th lens, meets following relationship: 0mm≤DR≤0.5mm, 0≤DR/HI≤0.3。
Preferably, the thing side optical surface of the second lens is being concave surface near optical axis place。
According to technique scheme, five chip imaging lens groups of the embodiment of the present invention, it is possible to utilize the combination of the refractive power of five lens, the point of inflexion, convex surface and concave surface, effectively to shorten the total length of optical image capture lens head and to improve image quality。
Accompanying drawing explanation
The above-mentioned and other feature of the present invention and advantage will become more aobvious according to its exemplary embodiments is explained in detail with reference to the accompanying drawings and be apparent from, wherein:
Fig. 1 is the schematic diagram of the relevant parameter according to the present invention。
Fig. 2 A is the schematic diagram of the five chip imaging lens groups according to the first embodiment of the present invention。
Fig. 2 B is the astigmatism according to the first embodiment of the present invention and the curve chart distorting aberration。
Fig. 2 C is the curve chart of the spherical aberration according to the first embodiment of the present invention。
Fig. 3 A is the schematic diagram of five chip imaging lens groups according to the second embodiment of the present invention。
Fig. 3 B is astigmatism according to the second embodiment of the present invention and the curve chart distorting aberration。
Fig. 3 C is the curve chart of spherical aberration according to the second embodiment of the present invention。
Fig. 4 A is the schematic diagram of five chip imaging lens groups according to the third embodiment of the invention。
Fig. 4 B is astigmatism according to the third embodiment of the invention and the curve chart distorting aberration。
Fig. 4 C is the curve chart of spherical aberration according to the third embodiment of the invention。
Description of reference numerals
112, the thing side optical surface of 212,312 first lens
114, the image side optical surface of 214,314 first lens
122, the thing side optical surface of 222,322 second lens
124, the image side optical surface of 224,324 second lens
132, the thing side optical surface of 232,332 the 3rd lens
134, the image side optical surface of 234,334 the 3rd lens
142, the thing side optical surface of 242,342 the 4th lens
144, the image side optical surface of 244,344 the 4th lens
152, the thing side optical surface of 252,352 the 5th lens
154, the image side optical surface of 254,354 the 5th lens
100,200,300 fixed aperture
160,260,360 infrared ray filter optical filter
370 protection eyeglasses
180,280,380 imaging surface
190,290,390 image sensing component
110,210,310 first lens
120,220,320 second lens
130,230,330 the 3rd lens
140,240,340 the 4th lens
150,250,350 the 5th lens
The image side optical surface of Sag4 the 4th lens intersection point on optical axis is to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface of the 4th lens
The thing side optical surface of Sag5 the 5th lens intersection point on optical axis is to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the thing side optical surface of the 5th lens
The image side optical surface of DR the 5th lens intersection point on optical axis is to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface of the 5th lens
Detailed description of the invention
In this use, vocabulary " and/or " comprise one or more relevant bar list of items any or all combination。When the narration prefix of " at least one " is before a component list, modify whole list element and individual elements in non-modified list。
Refer to Fig. 1, for the schematic diagram of the relevant parameter according to the present invention。In order to know characterising parameter Sag4, Sag5 and DR, Fig. 1 depict respectively Sag4 at the 4th lens 140 and Sag5 and DR the schematic diagram on the 5th lens 150。Wherein, the image side optical surface 144 of the 4th lens 140 intersection point on optical axis is Sag4 to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface 144 of the 4th lens 140, the thing side optical surface 152 of the 5th lens 150 intersection point on optical axis is Sag5 to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the thing side optical surface 152 of the 5th lens 150, the image side optical surface 152 of the 5th lens intersection point on optical axis is DR to horizontal displacement distance on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface 152 of the 5th lens。
Refer to Fig. 2 A, the schematic diagram of five chip imaging lens groups of its display first embodiment of the present invention。As shown in Figure 2 A, the present invention comprises optical image capture lens head, and it is sequentially comprised to image side along optical axis by thing side: the first lens the 110, second lens the 120, the 3rd lens the 130, the 4th lens 140 and the 5th lens 150。
First lens 110 are concave surface at the image side optical surface 114 near optical axis place with negative refractive power and these the first lens。Second lens 120 have negative refractive power near optical axis place。3rd lens 130 have positive refractive power near optical axis place, and the image side optical surface that thing side optical surface 132 is convex surface and the 3rd lens 134 of the 3rd lens is convex surface。4th lens 140 are convex surface at the thing side optical surface 142 near optical axis place with positive refractive power and the 4th lens。5th lens are convex surface at the image side optical surface 154 near optical axis place with negative refractive power and the 5th lens, wherein the image side optical surface 154 that image side optical surface 154 is aspheric surface and the 5th lens of these the 5th lens has the point of inflexion, has an Air space length between image side optical surface 144 and the thing side optical surface 152 of the 5th lens 150 of the 4th lens 140。
The present invention uses aspheric optical surface can be fabricated to the shape beyond sphere, to obtain more control variable and in order to cut down aberration, and then the compactedness between better resolution and lens is provided and effectively reduces the total length of camera lens。
The five chip imaging lens groups of the present invention also comprise fixed aperture 100 and filter optical filter 160 with infrared ray, and fixed aperture 100 is arranged between the 3rd lens 130 and the 4th lens 140。Infrared ray filters optical filter 160 and is then arranged between the 5th lens 150 and imaging surface 180, and this infrared ray filters optical filter 160 and is generally made by planar optics material, does not affect the focal length of optical frames group of the present invention。
The five chip imaging lens groups of the present invention also can comprise sense electronics optical assembly 190, and it is arranged on imaging surface 180, can by object imaging。First lens 110 can comprise plastic material or glass material to the 5th lens 150。The aspheric equation of the present invention is:
Z=ch2/[1+[1-(k+1)c2h2]0.5]+Ah4+Bh6+Ch8+Dh10+Eh12+Fh14+Gh16+Hh18+Jh20+…(1)。
Wherein, z be along optical axis direction highly for the position of h with surface vertices positional value for referencial use, k is cone normal manner amount, and c is the inverse of radius of curvature, and A, B, C, D, E, F, G, H and J are order aspherical coefficients。
First embodiment optical data as shown in Table 1, wherein the first lens 110 all use the aspherical equation formula of formula (1) to be constituted to thing side optical surface and the image side optical surface of the 5th lens 150, its asphericity coefficient as shown in Table 2 and its reference wavelength be d-line587nm。Wherein, the image side optical surface 144 of the 4th lens is 0.022mm to the Air space length T45 of the maximum horizontal displacement of the optics effective diameter position of the thing side optical surface 152 of the 5th lens, the image side optical surface 144 of the 4th lens intersection point on optical axis is to horizontal displacement distance Sag4=-0.172mm on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface 144 of the 4th lens, the thing side optical surface 152 of the 5th lens intersection point on optical axis is to horizontal displacement distance Sag5=-0.149mm on optical axis of the maximum effective diameter perpendicular projection of the thing side optical surface 152 of the 5th lens, wherein | Sag4 |/| Sag5 |=1.15 meet 0.8 < | Sag4 |/| Sag5 | < 1.4。
The vertical dimension HI=0.161mm of the point of inflexion on the image side optical surface 152 of the 5th lens and light between centers, the image side optical surface 152 of the 5th lens intersection point on optical axis is 0.004mm to horizontal displacement distance DR on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface 152 of the 5th lens, meet 0mm≤HI≤1mm and 0mm≤DR≤0.5mm, fixed aperture 100 is 2.120mm to the distance AT of imaging surface 180, the thing side optical surface 112 of the first lens is that 3.201mm, AT/OT=0.662 meet 0.5≤AT/OT≤0.8 to the distance OT of imaging surface 180。The maximum use visual angle FOV of five chip imaging lens groups is 104 ° and meets 90 ° < FOV < 180 °。First lens 110 are 56.07 at the abbe number Vd1 of spectrum 587.6nm, second lens 120 are 56.07 at the abbe number Vd2 of spectrum 587.6nm, 3rd lens 130 are 56.07 at the abbe number Vd3 of spectrum 587.6nm, 4th lens 140 are 56.07 at the abbe number Vd4 of spectrum 587.6nm, 5th lens 150 are 23.416 at the abbe number Vd5 of spectrum 587.6nm, and it meets Vd1+Vd2+Vd3+Vd4 > 6Vd5。
On optical axis, the thickness summation Σ CT of the lens of all tool refracting powers is 1.316mm, is 1.910mm from the distance TT of the image side optical surface 154 of thing side optical surface the 112 to the 5th lens of the first lens, and wherein Σ CT/TT=0.689 meets 0.5≤TT/OT≤0.7。Focal distance f=the 0.885mm of optical frames group, the thing side optical surface 122 of image side optical surface 114 to the second lens 120 of the first lens 110 distance T12 on optical axis is 0.442mm, wherein T12/f=0.500 and TT/OT=0.597, meet 0.3≤T12/f≤0.7 and 0.5≤TT/OT≤0.7, additionally, (CT2+T12)/CT1=4.07, DR/CT5=0.021, DR/HI=0.024, meet 2.0≤(CT2+T12)/CT1≤6.0 respectively, 0 < DR/CT5 < 0.3 and 0≤DR/HI≤0.3。
The basic lens data of table one, first embodiment
Table two, first embodiment asphericity coefficient
| Optical surface | First | Second | 3rd | Fourth face | 5th |
| k | -11.18096 | -0.57027 | 0.059039 | 181.49480 | 3.60068 |
| A | -0.31786 | -0.31869 | -0.74961 | -1.06924 | -0.77705 |
| B | 0.28116 | 2.41372 | -0.96605 | 2.25220 | -0.55400 |
| C | 0.022886 | -23.23963 | 10.04174 | 40.73166 | 20.35120 |
| D | -0.22264 | 139.04151 | 0.92031 | -172.78414 | -134.31131 |
| E | 0.15438 | -289.13573 | -55.53285 | 394.96905 | 422.42994 |
| F | 0 | 0 | 0 | 199.31224 | 0 |
| G | 0 | 0 | 0 | -4369.9037 | 0 |
| H | 0 | 0 | 0 | 0 | 0 |
| J | 0 | 0 | 0 | 0 | 0 |
| Optical surface | Is hexahedro | 7th | Octahedral | 9th | Tenth |
| k | -16.69323 | 0.86837 | -0.77535 | -0.34417 | -18.24851 |
| A | -1.24604 | -0.67134 | 1.17039 | 3.18023 | 1.66792 |
| B | 6.68300 | -0.54138 | -6.76210 | -12.11196 | -4.20907 |
| C | -20.30752 | -7.44727 | 25.46961 | 43.49374 | 10.87108 |
| D | -86.53005 | -0.060274 | -43.50019 | -21.03746 | -12.20478 |
| E | 1472.895 | -58.27052 | 8.92866 | -31.03092 | -13.10959 |
| F | -1078.2018 | 0 | 0 | 0 | 4.46675 |
| G | -313.9366 | 0 | 0 | 0 | 42.39692 |
| H | 0 | 0 | 0 | 0 | 0 |
| J | 0 | 0 | 0 | 0 | 0 |
By the basic lens data of table one and by the aberration curve figure of Fig. 2 B, 2C it can be seen that the present embodiment of five chip imaging lens groups according to the present invention, at astigmatism, distort aberration and spherical aberration has good compensation effect。
Refer to Fig. 3 A, the schematic diagram of five chip imaging lens groups of its display second embodiment of the present invention。As shown in Figure 3A, the present invention comprises optical image capture lens head, and it is sequentially comprised to image side along optical axis by thing side: the first lens the 210, second lens the 220, the 3rd lens the 230, the 4th lens 240 and the 5th lens 250。Wherein the first lens 210 all use the aspherical equation formula of formula (1) to be constituted to thing side optical surface and the image side optical surface of the 5th lens 250, its asphericity coefficient as shown in Table 4 and its reference wavelength be d-line587nm。
In a second embodiment, the image side optical surface 244 of the 4th lens is 0.032mm to the Air space length T45 of the maximum horizontal displacement of the optics effective diameter position of the thing side optical surface 252 of the 5th lens, the image side optical surface 244 of the 4th lens intersection point on optical axis is to horizontal displacement distance Sag4=-0.295mm on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface 244 of the 4th lens, the thing side optical surface 252 of the 5th lens intersection point on optical axis is to horizontal displacement distance Sag5=-0.247mm on optical axis of the maximum effective diameter perpendicular projection of the thing side optical surface 252 of the 5th lens, wherein | Sag4 |/| Sag5 |=1.19 meet 0.8 < | Sag4 |/| Sag5 | < 1.4。
The vertical dimension HI=0.231mm of the point of inflexion on the image side optical surface 252 of the 5th lens and light between centers, to the maximum effective diameter position of the image side optical surface 252 of the 5th lens, the horizontal displacement distance DR on optical axis is 0.030mm to the image side optical surface 252 of the 5th lens intersection point on optical axis, meet 0mm≤HI≤1mm and 0mm≤DR≤0.5mm, fixed aperture 200 is 3.028mm to the distance AT of imaging surface 280, the thing side optical surface 212 of the first lens is that 4.573mm, AT/OT=0.662 meet 0.5≤AT/OT≤0.8 to the distance OT of imaging surface 280。The maximum use visual angle FOV of five chip imaging lens groups is 170 ° and meets 90 ° < FOV < 180 °。First lens 110 are 56.07 at the abbe number Vd1 of spectrum 587.6nm, second lens 120 are 56.07 at the abbe number Vd2 of spectrum 587.6nm, 3rd lens 130 are 56.07 at the abbe number Vd3 of spectrum 587.6nm, 4th lens 140 are 56.07 at the abbe number Vd4 of spectrum 587.6nm, 5th lens 150 are 23.416 at the abbe number Vd5 of spectrum 587.6nm, and it meets Vd1+Vd2+Vd3+Vd4 > 6Vd5。
On optical axis, the thickness summation Σ CT of the lens of all tool refracting powers is 1.880mm, is 2.728mm from the distance TT of the image side optical surface 254 of thing side optical surface the 212 to the 5th lens of the first lens, and wherein Σ CT/TT=0.689 meets 0.5≤TT/OT≤0.7。Focal distance f=the 1.264mm of optical frames group, the thing side optical surface 222 of image side optical surface 214 to the second lens 220 of the first lens 210 distance T12 on optical axis is 0.632mm, wherein T12/f=0.500 and TT/OT=0.597, meet 0.3≤T12/f≤0.7 and 0.5≤TT/OT≤0.7, additionally, (CT2+T12)/CT1=4.061, DR/CT5=0.112, DR/HI=0.130, meet 2.0≤(CT2+T12)/CT1≤6.0 respectively, 0 < DR/CT5 < 0.3 and 0≤DR/HI≤0.3。
The table basic lens data of the three, second embodiment
The asphericity coefficient of table the four, second embodiment
| Optical surface | First | Second | 3rd | Fourth face | 5th |
| k | -11.18096 | -0.57027 | 0.059039 | 181.4948 | 3.60068 |
| A | -0.10903 | -0.10931 | -0.25712 | -0.36675 | -0.26653 |
| B | 0.047254 | 0.40567 | -0.16236 | 0.37853 | -0.093110 |
| C | 0.001885 | -1.91388 | 0.82698 | 3.35443 | 1.67601 |
| D | -0.008984 | 5.61083 | 0.037138 | -6.97246 | -5.41995 |
| E | 0.003052 | -5.71716 | -1.09807 | 7.80983 | 8.35282 |
| F | 0 | 0 | 1.93112 | 0 | -10.44659 |
| G | 0 | 0 | -20.73689 | 0 | -1.49043 |
| H | 0 | 0 | 0 | 0 | 0 |
| J | 0 | 0 | 0 | 0 | 0 |
| Optical surface | Is hexahedro | 7th | Octahedral | 9th | Tenth |
| k | -16.69323 | 0.86837 | -0.77535 | -0.34417 | -18.24851 |
| A | -0.42739 | -0.23027 | 0.40144 | 1.09082 | 0.57210 |
| B | 1.12321 | -0.09099 | -1.13651 | -2.03566 | -0.70742 |
| C | -1.67241 | -0.61332 | 2.09753 | 3.58190 | 0.89528 |
| D | -3.4918 | -0.002432 | -1.75539 | -0.84894 | -0.49251 |
| E | 29.12395 | -1.15220 | 0.17655 | -0.61358 | -0.25922 |
| F | 0 | 0 | 0 | 0 | 0.043278 |
| G | 0 | 0 | 0 | 0 | 0.20128 |
| H | 0 | 0 | 0 | 0 | 0 |
| J | 0 | 0 | 0 | 0 | 0 |
By the basic lens data of table three and by the aberration curve figure of Fig. 3 B, 3C it can be seen that the present embodiment of five chip imaging lens groups according to the present invention, at astigmatism, distort aberration and spherical aberration has good compensation effect。
Refer to Fig. 4 A, the schematic diagram of five chip imaging lens groups of its display third embodiment of the present invention。As shown in Figure 4 A, the present invention comprises optical image capture lens head, and it is sequentially comprised to image side along optical axis by thing side: the first lens the 310, second lens the 320, the 3rd lens the 330, the 4th lens 340 and the 5th lens 350。It is different from first embodiment and the second embodiment, also add protection eyeglass 370 in the present embodiment and filter between optical filter 360 and imaging surface 380 in infrared ray。Wherein the first lens 310 all use the aspherical equation formula of formula (1) to be constituted to thing side optical surface and the image side optical surface of the 5th lens 350, its asphericity coefficient as shown in Table 6 and its reference wavelength be d-line587nm。
In the third embodiment, the image side optical surface 344 of the 4th lens is 0.03mm to the Air space length T45 of the maximum horizontal displacement of the optics effective diameter position of the thing side optical surface 352 of the 5th lens, the image side optical surface 344 of the 4th lens intersection point on optical axis is to horizontal displacement distance Sag4=-0.508mm on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface 344 of the 4th lens, the thing side optical surface 352 of the 5th lens intersection point on optical axis is to horizontal displacement distance Sag5=-0.520mm on optical axis of the maximum effective diameter perpendicular projection of the thing side optical surface 352 of the 5th lens, wherein | Sag4 |/| Sag5 |=0.98 meets 0.8 < | Sag4 |/| Sag5 | < 1.4。
The vertical dimension HI=0.427mm of the point of inflexion on the image side optical surface 352 of the 5th lens and light between centers, the image side optical surface 352 of the 5th lens intersection point on optical axis is 0.035mm to horizontal displacement distance DR on optical axis of the maximum effective diameter perpendicular projection of the image side optical surface 352 of the 5th lens, meet 0mm≤HI≤1mm and 0mm≤DR≤0.5mm, fixed aperture 300 is 6.077mm to the distance AT of imaging surface 380, the thing side optical surface 312 of the first lens is that 9mm, AT/OT=0.675 meet 0.5≤AT/OT≤0.8 to the distance OT of imaging surface 380。The maximum use visual angle FOV of five chip imaging lens groups is 120 ° and meets 90 ° < FOV < 180 °。First lens 110 are 56.07 at the abbe number Vd1 of spectrum 587.6nm, second lens 120 are 56.07 at the abbe number Vd2 of spectrum 587.6nm, 3rd lens 130 are 56.07 at the abbe number Vd3 of spectrum 587.6nm, 4th lens 140 are 56.07 at the abbe number Vd4 of spectrum 587.6nm, 5th lens 150 are 23.416 at the abbe number Vd5 of spectrum 587.6nm, and it meets Vd1+Vd2+Vd3+Vd4 > 6Vd5。
On optical axis, the thickness summation Σ CT of the lens of all tool refracting powers is 3.402mm, is 5.237mm from the distance TT of the image side optical surface 354 of thing side optical surface the 312 to the 5th lens of the first lens, and wherein Σ CT/TT=0.650 meets 0.5≤TT/OT≤0.7。Focal distance f=the 2.487mm of optical frames group, the thing side optical surface 322 of image side optical surface 314 to the second lens 320 of the first lens 310 distance T12 on optical axis is 1.334mm, wherein T12/f=0.536 and TT/OT=0.582, meet 0.3≤T12/f≤0.7 and 0.5≤TT/OT≤0.7, additionally, (CT2+T12)/CT1=4.359, DR/CT5=0.037, DR/HI=0.040, meet 2.0≤(CT2+T12)/CT1≤6.0 respectively, 0 < DR/CT5 < 0.3 and 0≤DR/HI≤0.3。
Table the five, the 3rd basic lens data of embodiment
The asphericity coefficient of table the six, the 3rd embodiment
By the basic lens data of table five and by the aberration curve figure of Fig. 4 B, 4C it can be seen that the present embodiment of five chip imaging lens groups according to the present invention, at astigmatism, distort aberration and spherical aberration has good compensation effect。
Although the present invention is particularly shown with reference to its exemplary embodiments and describes, for understood by one of ordinary skill in the art, under the spirit and category of the present invention defined without departing from the application the scope of the claims and equivalent thereof, it will can be carried out form and the various changes in details。
Claims (17)
1. a chip imaging lens group, it is characterised in that comprise:
Fixed aperture；
Optical frames group, is sequentially comprised to image side along optical axis by thing side
First lens, the image side optical surface that described first lens have negative refractive power and described first lens at close described optical axis place is concave surface；
Second lens, described second lens have negative refractive power near described optical axis place；
3rd lens, described 3rd lens have positive refractive power near described optical axis place, and the image side optical surface that thing side optical surface is convex surface and described 3rd lens of described 3rd lens is convex surface；
4th lens, the thing side optical surface that described 4th lens have positive refractive power and described 4th lens at close described optical axis place is convex surface；And
5th lens, the image side optical surface that described 5th lens have negative refractive power and described 5th lens at close described optical axis place is convex surface, and the image side optical surface of wherein said 5th lens is aspheric surface；
Between image side optical surface and the thing side optical surface of described 5th lens of wherein said 4th lens, there is Air space length。
2. five chip imaging lens groups as claimed in claim 1, it is characterized in that, the image side optical surface of described 4th lens is T45 to the described Air space length of the maximum horizontal displacement of the optics effective diameter position of the thing side optical surface of described 5th lens, meets relationship below:
T45>0.01mm。
3. five chip imaging lens groups as claimed in claim 1, it is characterized in that, the maximum effective diameter perpendicular projection of the image side optical surface of described 4th lens intersection point on the described optical axis extremely image side optical surface of described 4th lens horizontal displacement distance on described optical axis is Sag4, the maximum effective diameter perpendicular projection of the thing side optical surface of described 5th lens intersection point on the described optical axis extremely thing side optical surface of described 5th lens horizontal displacement distance on described optical axis is Sag5, meets following relationship:
0.8<|Sag4|/|Sag5|<1.4。
4. five chip imaging lens groups as claimed in claim 1, it is characterised in that the image side optical surface of described 5th lens has at least one point of inflexion。
5. five chip imaging lens groups as claimed in claim 4, it is characterised in that on the image side optical surface of described 5th lens, the vertical dimension near the point of inflexion of described optical axis Yu described smooth between centers is HI, meets following relationship:
0mm≤HI≤1mm。
6. five chip imaging lens groups as claimed in claim 1, it is characterized in that, the maximum effective diameter perpendicular projection of the image side optical surface of described 5th lens intersection point on the described optical axis extremely image side optical surface of described 5th lens horizontal displacement distance on described optical axis is DR, meets following relationship:
0mm≤DR≤0.5mm。
7. five chip imaging lens groups as claimed in claim 1, it is characterised in that also comprise aperture and imaging surface；Wherein on described optical axis, described aperture is AT to the distance of described imaging surface, and the thing side optical surface of described first lens is OT to the distance of described imaging surface, meets following relationship:
0.5≤AT/OT≤0.8。
8. five chip imaging lens groups as claimed in claim 1, it is characterised in that the maximum use visual angle of described five chip imaging lens groups is FOV, meets following relationship:
FOV>90°。
9. five chip imaging lens groups as claimed in claim 1, it is characterized in that, described first lens are Vd1 at the abbe number of spectrum 587.6nm, described second lens are Vd2 at the abbe number of spectrum 587.6nm, described 3rd lens are Vd3 at the abbe number of spectrum 587.6nm, described 4th lens are Vd4 at the abbe number of spectrum 587.6nm, and described 5th lens are Vd5 at the abbe number of spectrum 587.6nm, meet following relationship:
Vd1+Vd2+Vd3+Vd4>6Vd5。
10. five chip imaging lens groups as claimed in claim 1, it is characterized in that, on described optical axis, the thickness summation of the lens of all tool refracting powers is Σ CT, it is TT from the thing side optical surface of described first lens to the distance of the image side optical surface of described 5th lens, meets following relationship:
0.5≤ΣCT/TT≤0.85。
11. five chip imaging lens groups as claimed in claim 1, it is characterized in that, the focal length of described optical frames group is f, and the thing side optical surface of the image side optical surface of described first lens extremely described second lens distance on described optical axis is T12, meets following relationship:
0.3≤T12/f≤0.7。
12. five chip imaging lens groups as claimed in claim 1, it is characterised in that also comprise imaging surface；Wherein on described optical axis, the thing side optical surface of described first lens is TT to the distance of the image side optical surface of described 5th lens, and the thing side optical surface of described first lens is OT to the distance of described imaging surface, meets following relationship: 0.5≤TT/OT≤0.7。
13. five chip imaging lens groups as claimed in claim 1, it is characterized in that, on described optical axis, the image side optical surface of described first lens is T12 to the distance of the thing side optical surface of described second lens, described first lens and thickness respectively CT1 and CT2 of described second lens, meet following relationship:
2.0≤(CT2+T12)/CT1≤6.0。
14. five chip imaging lens groups as claimed in claim 1, it is characterised in that the maximum use visual angle of described five chip imaging lens groups is FOV, meets following relationship:
90°<FOV<180°。
15. five chip imaging lens groups as claimed in claim 6, it is characterised in that described 5th lens thickness on described optical axis is CT5, meets following relationship:
0<DR/CT5<0.3。
16. five chip imaging lens groups as claimed in claim 5, it is characterized in that, the maximum effective diameter perpendicular projection of the image side optical surface of described 5th lens intersection point on the described optical axis extremely image side optical surface of described 5th lens horizontal displacement distance on described optical axis is DR, meets following relationship:
0≤DR/HI≤0.3。
17. five chip imaging lens groups as claimed in claim 1, it is characterised in that the thing side optical surface of described second lens is being concave surface near described optical axis place。
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Cited By (1)
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| CN108196355A (en) * | 2018-03-05 | 2018-06-22 | 嘉兴中润光学科技有限公司 | Optics tight shot |
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| CN201278039Y (en) * | 2008-03-11 | 2009-07-22 | 富士能株式会社 | Photographic lens and photographic device using the lens |
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