CN101435910A - Focus fixing lens - Google Patents
Focus fixing lens Download PDFInfo
- Publication number
- CN101435910A CN101435910A CNA2007101698684A CN200710169868A CN101435910A CN 101435910 A CN101435910 A CN 101435910A CN A2007101698684 A CNA2007101698684 A CN A2007101698684A CN 200710169868 A CN200710169868 A CN 200710169868A CN 101435910 A CN101435910 A CN 101435910A
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- Prior art keywords
- lens
- tight shot
- negative
- thing side
- diopter
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- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 230000005499 meniscus Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 description 4
- 238000012856 packing Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 230000003442 weekly effect Effects 0.000 description 1
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Abstract
The invention provides a fixed-focus lens, which comprises a first lens group and a second lens group. The first lens group has negative diopter, and mainly comprises a first lens, a second lens, a third lens and a fourth lens which are arranged from an object side to an image side in sequence; and diopters of the first lens, the second lens, the third lens and the fourth lens are negative, negative, positive and negative in sequence. The second lens group is arranged between the first lens group and the image side, has positive diopter, and comprises a fifth lens and a sixth lens which are arranged from the object side to the image side in sequence; and diopters of the fifth lens and the sixth lens are both positive.
Description
Technical field
The present invention relates to a kind of camera lens, and particularly relate to a kind of tight shot (fixed-focuslens).
Background technology
Along with the modern times are looked the letter development of technology, digital camera and digital camera (wait device for image to be used at large, and are widely used in each field.One of core parts in these device for image are camera lens, its in order to image definition image on screen or the charge coupled cell, and when device for image is applied in some specific area, it can adopt wide-angle lens to increase field angle.For instance, automobile-used reversing video camera or driving assisted tomography machine just need to adopt wide-angle lens.Generally speaking, the horizontal field of view angle of automobile-used wide-angle lens is about about 100 degree.In addition, the f-number (f-number) in the general automobile-used wide-angle lens is about 2.8.In addition, the length of automobile-used wide-angle lens and volume must be less, so that insert in the bumper bar of automobile or other position of vehicle body.
With reference to Fig. 1, the 6th, 853, No. 495 disclosed wide-angle lens 100 of U.S.'s patent of invention comprise from the thing side to two lens combination 110 that are arranged in order as side and 120, its diopter be respectively negative with just.Lens combination 110 is made up of two lens 112 and 114, and its diopter is all negative, and lens 114 are non-spherical lens.Lens combination 120 is made up of five lens 121,122,123,124 and 125, that its diopter is followed successively by is negative, positive, just, positive and negative.Because wide-angle lens 100 has non-spherical lens (being lens 114), and the manufacturing cost of non-spherical lens is higher, so the cost of wide-angle lens 100 is higher.In addition, because wide-angle lens 100 has seven lens 112,114,121,122,123,124,125 altogether, so the length of wide-angle lens 100 is long and volume is bigger.
Summary of the invention
The invention provides a kind of tight shot, its field angle is big, f-number is less, volume is less and length is shorter.
One embodiment of the invention propose a kind of tight shot, and it comprises first lens combination and second lens combination.First lens combination has negative diopter, and first lens combination is mainly by being formed toward first lens, second lens, the 3rd lens and the 4th lens that are arranged in order as side from the thing side.The diopter of the first, second, third and the 4th lens is followed successively by negative, negative, positive, negative.Second lens combination is disposed between first lens combination and the picture side, and has positive diopter.Second lens combination comprises from the thing side toward the 5th lens and the 6th lens that are arranged in order as side.The diopter of the 5th lens and the 6th lens just is all.
Because tight shot can only have six-element lens, so the length of tight shot is short and volume is less, and can meet the demand of camera for vehicle.In addition, tight shot has bigger field angle, its horizontal field of view angle can greater than 130 the degree, and the field angle of diagonal can near 180 the degree.
For above-mentioned feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and in conjunction with the accompanying drawings, be described in detail below.
Description of drawings
Fig. 1 is a kind of structural representation of existing wide-angle lens;
Fig. 2 is the structural representation of the tight shot of one embodiment of the invention;
Fig. 3 A to Fig. 3 C is the image optics emulated data figure of the tight shot of Fig. 2.
Embodiment
The explanation of following each embodiment is with reference to accompanying drawing, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be the direction of accompanying drawing.Therefore, the direction term of use is to be used for explanation, but not is used for limiting the present invention.
With reference to Fig. 2, the tight shot 200 of one embodiment of the invention comprises first lens combination 210 and second lens combination 220.First lens combination 210 has negative diopter, and first lens combination 210 is mainly by being formed toward first lens 212, second lens 214, the 3rd lens 216 and the 4th lens 218 that are arranged in order as side from the thing side.The diopter of the first, second, third and the 4th lens 212,214,216,218 is followed successively by negative, negative, positive, negative.In the present embodiment, the first, second, third and the 4th lens 212,214,216,218 for example be followed successively by convex surface towards the meniscus of thing side, convex surface towards meniscus, biconvex lens and the convex surface of thing side meniscus towards the thing side.
Generally speaking, as the configurable photo-sensitive cell 50 of side, with the image of sensing from the thing side.In the present embodiment, photo-sensitive cell 50 for example is charge coupled cell or CMOS semiconductor sensor.Yet in other embodiments, photo-sensitive cell 50 can also be egative film or other suitable photo-sensitive cell.In the present embodiment, tight shot 200 can also comprise aperture diaphragm 230, and it is disposed between first lens combination 210 and second lens combination 220, that is is disposed between the 4th lens 218 and the 5th lens 222.
Because tight shot 200 can only have six-element lens (i.e. the first, second, third, fourth, the 5th and the 6th lens 212,214,216,218,222,224), therefore the length of tight shot 200 is less than weak point and volume, and can meet the demand of camera for vehicle, so that insert in the bumper bar of automobile or other position of vehicle body.In addition, tight shot 200 has bigger field angle, its horizontal field of view angle can greater than 130 the degree, and the field angle of diagonal can near 180 the degree, thereby can make the reversing or the driving the visual field wider.In other words, tight shot 200 can be wide-angle lens.In addition, the f-number of tight shot 200 can be as small as 2.0, so that light-inletting quantity is bigger, and is convenient to use under darker environment.Moreover tight shot 200 can not need adopt non-spherical lens, just can reach the advantage that volume is less, length is short, so the cost of tight shot 200 is lower.
In the present embodiment, but first lens, 212 breastings, second lens 214, but and second lens, 214 breastings the 3rd lens 216.In addition, but the 4th lens 218 breasting aperture diaphragms 230, but and aperture diaphragm 230 breastings the 5th lens 222.In other words, need not dispose packing ring (spacer) between first, second and the 3rd lens 212,214,216, and also need not dispose packing ring between the 4th lens 218, aperture diaphragm 230 and the 5th lens 222, so just can further dwindle the length and the volume of tight shot 200, also can reduce cost because of the use that reduces packing ring.
In the present embodiment, tight shot 200 is used for filtering outside the infrared light from the thing side except collocation places infrared light optical filter between second lens combination 220 and the photo-sensitive cell 50; The surperficial S10 of the 5th lens 222 of tight shot 200 can be towards the plane of thing side, and surperficial S10 goes up the configurable infrared light filter coating 240 that has.Infrared light filter coating 240 for example is that the mode with plated film is plated on the surperficial S10.Infrared light filter coating 240 can filter the infrared light from the thing side, so that photo-sensitive cell 50 can show comparatively natural color.Because tight shot 200 can adopt the infrared light filter coating 240 that is disposed at lens surface S10 and more do not take up space replacing the infrared light optical filter (IR-cut filter) that takes up space, so the length of tight shot 200 and volume can further dwindle.
Following content will be enumerated the preferable parameter value in the tight shot 200, yet hereinafter cited data are not that any those skilled in the art are after reference the present invention in order to qualification the present invention, when doing suitable change, as long as it must belong in the scope of the present invention to its parameter or setting.
Table one
In Table 1, radius-of-curvature (mm) refers to the radius-of-curvature that each is surperficial, and spacing (mm) refers to the air line distance on main shaft between two adjacent surfaces.For instance, the spacing of surperficial S1, promptly surperficial S1 is to the air line distance on main shaft between surperficial S2.The pairing thickness of each lens, refractive index and Abbe number please refer to each spacing in the same column, refractive index and Abbe number value corresponding in the remarks column.In addition, in Table 1, surperficial S1, S2 are two surfaces of first lens 212.S3, S4 are two surfaces of second lens 214 on the surface.S5, S6 are two surfaces of the 3rd lens 216 on the surface.S7, S8 are two surfaces of the 4th lens 218 on the surface.Surface S9 is the surface of aperture diaphragm 230.S10, S11 are two surfaces of the 5th lens 222 on the surface.S12, S13 are two surfaces of the 6th lens 224 on the surface.The spacing of being filled out in those row of surface S13 is that surperficial S13 is to the spacing of photo-sensitive cell away from the surface of thing side.About each surperficial radius-of-curvature, spacing or the like parameter value, please refer to table one, no longer repeat at this.
Fig. 3 A to Fig. 3 C is the image optics emulated data figure of the tight shot of Fig. 2.With reference to Fig. 3 A to Fig. 3 C, wherein Fig. 3 A is optical transfer function (modulation transfer function, MTF) curve map, its transverse axis be weekly the phase/spatial frequency (spatial frequency incycles per millimeter) of millimeter, the longitudinal axis is the modulus (modulus of theoptical transfer function, modulus of the OTF) of optics transfer function.In Fig. 3 B, be followed successively by the figure of longitudinal spherical aberration, the astigmatism curvature of field and distortion from the right side by a left side.Fig. 3 C is lateral chromatic aberration (lateral color) figure of image, and the maximum field among Fig. 3 C is 80.0000 degree (degree).To sum up state, the shown figure that goes out of Fig. 3 A to Fig. 3 C all in the scope of standard, can verify that thus the tight shot 200 of present embodiment has favorable imaging quality.
In sum, because tight shot can only have six-element lens, so the length of tight shot is short and volume is less, and can meet the demand of camera for vehicle, so that insert in the bumper bar of automobile or other position of vehicle body.In addition, tight shot has bigger field angle, its horizontal field of view angle can greater than 130 the degree, and the field angle of diagonal can near 180 the degree, thereby can make the reversing or the driving the visual field wider.In addition, the f-number of tight shot can be as small as 2.0, so that light-inletting quantity is bigger, and is convenient to use under darker environment.In addition, tight shot can not need adopt non-spherical lens, just can reach the advantage that volume is less, length is short, so the cost of tight shot is lower.In addition, tight shot can also adopt the infrared light optical filter of infrared light filter coating to take up space in the replacement prior art that is disposed at lens surface and does not more take up space, and the length of tight shot and volume can further be dwindled.
Though the present invention with preferred embodiment openly as above; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the accompanying Claim person of defining.Arbitrary embodiment of the present invention in addition or claim must not reached whole purpose disclosed in this invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.
Claims (9)
1, a kind of tight shot comprises:
First lens combination, has negative diopter, described first lens combination is mainly by being formed toward first lens, second lens, the 3rd lens and the 4th lens that are arranged in order as side from the thing side, wherein said first, second, third and the diopter of the 4th lens be followed successively by negative, negative, positive, negative; And
Second lens combination, be disposed between described first lens combination and the described picture side, and having a positive diopter, described second lens combination comprises that from described thing side toward described the 5th lens and the 6th lens that are arranged in order as side, the diopter of wherein said the 5th lens and described the 6th lens just is all.
2, tight shot as claimed in claim 1, wherein said the 5th lens have towards the plane of described thing side, and described tight shot also comprises the infrared light filter coating, is disposed on the described plane.
3, tight shot as claimed in claim 1 also comprises aperture diaphragm, is disposed between described first lens combination and described second lens combination.
4, tight shot as claimed in claim 3, the described aperture diaphragm of wherein said the 4th lens breasting, and described the 5th lens of described aperture diaphragm breasting.
5, tight shot as claimed in claim 1, described second lens of the wherein said first lens breasting, and described the 3rd lens of the described second lens breasting.
6, tight shot as claimed in claim 1, the wherein said first, second, third and the 4th lens be followed successively by convex surface towards the meniscus of described thing side, convex surface towards meniscus, biconvex lens and the convex surface of described thing side meniscus towards described thing side.
7, tight shot as claimed in claim 1, wherein said the 5th lens and described the 6th lens are respectively plano-convex lens and the biconvex lens of convex surface towards described picture side.
8, as claim 1 tight shot of stating, wherein said the first, second, third, fourth, the 5th and the 6th lens are spherical lens.
9, tight shot as claimed in claim 1, the material of wherein said the first, second, third, fourth, the 5th and the 6th lens comprises glass or plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101698684A CN101435910A (en) | 2007-11-14 | 2007-11-14 | Focus fixing lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101698684A CN101435910A (en) | 2007-11-14 | 2007-11-14 | Focus fixing lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101435910A true CN101435910A (en) | 2009-05-20 |
Family
ID=40710429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101698684A Pending CN101435910A (en) | 2007-11-14 | 2007-11-14 | Focus fixing lens |
Country Status (1)
| Country | Link |
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| CN (1) | CN101435910A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523378A (en) * | 2011-12-21 | 2012-06-27 | 杭州志达光电有限公司 | Image transfer lens |
| CN104007534A (en) * | 2014-06-05 | 2014-08-27 | 舜宇光学(中山)有限公司 | Super-depth-of-field narrow-band-pass identification lens capable of obtaining iris images of two eyes simultaneously |
| CN104010121A (en) * | 2014-06-12 | 2014-08-27 | 信利光电股份有限公司 | Camera module |
| CN104122645B (en) * | 2014-03-12 | 2017-02-15 | 玉晶光电(厦门)有限公司 | Optical imaging lens and electronic device using same |
| CN110249251A (en) * | 2017-02-07 | 2019-09-17 | 斯纳普公司 | Imaging lens arrangement |
-
2007
- 2007-11-14 CN CNA2007101698684A patent/CN101435910A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523378A (en) * | 2011-12-21 | 2012-06-27 | 杭州志达光电有限公司 | Image transfer lens |
| CN104122645B (en) * | 2014-03-12 | 2017-02-15 | 玉晶光电(厦门)有限公司 | Optical imaging lens and electronic device using same |
| CN104007534A (en) * | 2014-06-05 | 2014-08-27 | 舜宇光学(中山)有限公司 | Super-depth-of-field narrow-band-pass identification lens capable of obtaining iris images of two eyes simultaneously |
| CN104010121A (en) * | 2014-06-12 | 2014-08-27 | 信利光电股份有限公司 | Camera module |
| CN110249251A (en) * | 2017-02-07 | 2019-09-17 | 斯纳普公司 | Imaging lens arrangement |
| CN110249251B (en) * | 2017-02-07 | 2021-11-02 | 斯纳普公司 | Imaging lens assembly |
| US11287601B2 (en) | 2017-02-07 | 2022-03-29 | Snap Inc. | Imaging lens assembly |
| US11835786B2 (en) | 2017-02-07 | 2023-12-05 | Snap Inc. | Imaging lens assembly |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Open date: 20090520 |