CN2731485Y - Lens of digital camera and digital camera module using the same - Google Patents
Lens of digital camera and digital camera module using the same Download PDFInfo
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- CN2731485Y CN2731485Y CN 200420072107 CN200420072107U CN2731485Y CN 2731485 Y CN2731485 Y CN 2731485Y CN 200420072107 CN200420072107 CN 200420072107 CN 200420072107 U CN200420072107 U CN 200420072107U CN 2731485 Y CN2731485 Y CN 2731485Y
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- lens
- aspheric surface
- digital camera
- camera lens
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Abstract
The utility model relates to a digital camera lens and a digital camera module using the lens. The digital camera lens comprises a first lens, a second lens, and a third lens sequentially from the position of the object. The first lens is a biconvex and two-sided aspherical positive lens, comprising a first aspheric surface and a second aspheric surface whose material quality are glass. The second lens is a concavo-convex and two-sided aspherical negative lens, comprising a third aspheric surface and a fourth aspheric surface whose material quality are plastic rubber. The third lens is an aspherical positive lens whose surface is in the shape of wave, comprising a fifth aspheric surface and a sixth aspheric surface whose material quality are glass. The digital camera module using the lens includes the digital camera lens having high analytical degree and relatively stabile imaging quality.
Description
[technical field]
The utility model is about a kind of digital camera lens, especially about a kind of digital camera lens that can be used with portable electron device and the numerical camera mould of using this camera lens thereof.
[background technology]
Along with the continuous development of science and technology, portable electron device, increasingly extensive as the application of mobile phone, simultaneously also day by day trend towards light and handy, attractive in appearance and multifunction, wherein, camera function is the additional function of new development portable electron device in recent years.The mobile phone of tool digital camera is because of realizing being shooting function, the favor that more and more is subjected to numerous users easy to use.Because of the mobile phone volume is little, so the digital camera lens module that needs to install within it has smaller size smaller.When people pursue miniaturization to mobile phone with numerical camera mould, the object of its shooting is wished that higher image quality is arranged, and the image quality of object depends on the quality of digital camera lens design to a great extent.
Digital camera generally comprises camera lens and Image Sensor (Charge CoupledDevice (calling CCD in the following text), charge-coupled device or Complementary Metal-OxideSemiconductor (calling CMOS in the following text), the complementarity matal-oxide semiconductor), the CCD of different pixels or CMOS Image Sensor, the digital camera lens that needs design and its CCD or CMOS to be complementary.
In the prior art, the camera lens of digital camera generally is to adopt glass material, and its lens adopt spherical lens, because of spherical lens unavoidably produces aberration, needs a plurality of lens to reach the requirement of respective performances.Increasing of quantity, the volume, the weight that have increased camera lens have also increased manufacturing cost simultaneously.
For volume and the manufacturing cost that reduces camera lens, part adopts non-spherical lens in the camera lens of existing digital camera, non-spherical lens can avoid camera lens because of adopting the spherical aberration that spherical lens produced, and adopts less lens can satisfy its optical property preferably.Because of non-spherical lens has its distinctive optical benefits, in existing camera lens, adopt overall plastic glue formula aspherical lens to be used widely, adopt above-mentioned structure after, though can improve optical property by adjusting asphericity coefficient, and reduce eyeglass quantity, but wherein all adopt the aspheric surface plastic lens, plastic lens is compared with glass mirror, and logical photosensitiveness is relatively poor, when not being good, imaging effect is poor at light.Though the glass aspherical lens can meet the demands, its price and production capacity all do not reach the stage of ripeness, cause cost higher, and product market competitiveness is descended.
Therefore often adopt spherical mirror to add the structure of aspheric mirror in the prior art.One existing 350,000 picture element digital camera lens, as announce the camera lens that is disclosed for No. 02258384 in the Chinese patent on October 1st, 2003, it is made up of one first lens, one second lens and one the 3rd lens, these first lens and second lens are the spherical glass eyeglass, and the 3rd lens are that the two sides is all aspheric plastic lens.Though this digital camera lens can satisfy the requirement of imaging, but adopt the 3rd lens of plastic cement material to place at last, make its influence that is subject to environment, the imaging instability, and this digital camera lens resolution is lower, can't satisfy the requirement of high-resolution lens.
Another existing digital camera lens that adopts the part aspherical lens, as announce the camera lens that is disclosed for the 6th, 441, No. 971 in the United States Patent (USP) on August 27th, 2002, it begins to comprise successively one first lens, one second lens and one the 3rd lens from object space.Wherein these first lens adopt the spherical glass eyeglass, and second, third adopts the plastic cement aspherical lens, although this camera lens volume is less, resolution is also lower, and the employing of two plastic lens makes it more be subject to the influence of environment.
In sum, provide a kind of resolution height, metastable digital camera lens of image quality and the numerical camera mould of using this camera lens thereof are very necessary.
[summary of the invention]
The purpose of this utility model is to provide a kind of imaging performance good, the digital camera lens that image quality is relatively stable and resolution is high.
Another purpose of the present utility model is to provide the numerical camera mould of using this camera lens.
The utility model is a kind of digital camera lens, and it comprises one first lens successively from object space, one second lens, one the 3rd lens.First lens are biconvex double-sized non-spherical positive lens, comprise first aspheric surface and second aspheric surface, its material is a glass, second lens are concavo-convex double-sized non-spherical negative lens, comprise the 3rd aspheric surface and the 4th aspheric surface, and its material is a plastic cement, its the 3rd lens are the aspheric surface positive lens, its surperficial undulate shape comprises the 5th aspheric surface and the 6th aspheric surface, and its material is a glass.First lens, second lens, the 3rd lens shape are all the axisymmetric eyeglass.
A kind of numerical camera mould of this digital camera lens of application comprises above-mentioned digital camera lens.
Compare prior art, the utility model digital camera lens adopts aspheric surface glass mirror and aspheric surface plastic lens, and glass mirror guarantees its logical preferably rotary light performance, makes it under the relatively poor situation of light, also can guarantee imaging effect; With material be second eyeglass of plastic cement to place material be between first eyeglass and prismatic glasses of glass, second eyeglass is effectively protected, make this digital camera lens not be subject to the influence of external environment, image quality is relatively stable; In addition, this digital camera lens resolution height can reach 2,000,000 picture elements.The numerical camera mould of using this digital camera lens is because of adopting this digital camera lens, and imaging performance is good, and image quality is relatively stable and resolution is higher.
[description of drawings]
Fig. 1 is the structural representation of the utility model digital camera lens;
Fig. 2 A is the curvature of field figure of the utility model digital camera lens;
Fig. 2 B is the optical distortion figure of the utility model digital camera lens;
Fig. 3 is the MTF figure of the utility model digital camera lens;
Fig. 4 is the relative exposure figure of the utility model digital camera lens.
[embodiment]
Please refer to Fig. 1, the utility model digital camera lens 10 comprises one first lens 1, one second lens 2, the 3rd lens 3 and a parallel-plate 4 successively from object space to picture side.The optical axis of its center line O representative shot 10, Z
OBJRepresent object space, Z
IMGRepresentative picture side, the lens that first lens 1 of camera lens object space position at first contact as light when using.This digital camera lens also comprises and being positioned on the object space position, places the light hurdle 6 before first eyeglass 1 and be positioned at the image aspect to put, and places the Image Sensor 5 behind the parallel-plate, and this Image Sensor 5 comprises an imaging surface 52.
The 3rd lens 3 adopt the optical glass materials, the refractive index of used optical glass material and dispersion range formula: the 1.65＜n that meets the following conditions
3＜1.75,50＜v
3＜60, in this preferred embodiment, adopt the L-LAL13 model, refractive index and chromatic dispersion are respectively n
3=1.6935, v
3=53.2.
Parallel-plate 4 is a sheet glass, comprises the first parallel-plate face 42 and the second parallel-plate face 44.Parallel-plate 4 is in order to the imaging surface 52 of protection Image Sensor 5, and its material is preferably B270, and refractive index and chromatic dispersion are respectively n
4=1.52308, v
4=58.57.But plating one deck IR-cut filter membrane (IR-cut Coating) on arbitrary surface of this parallel-plate 4 comes from the infrared ray in the light of object reflection, thereby improves image quality with filtering; In addition, also can be at least one coating surface one deck IR-cut filter membrane of first lens 1 or the 3rd lens 3, come from the infrared ray in the light of object reflection with filtering.
Please refer to table 1, the related parameter values of the optical system of the utility model digital camera lens, it is described from light hurdle face 61 to imaging surface 52 successively, and wherein radius of curvature R is the radius-of-curvature of the crossing curved surface of each face and optical axis O, when curvature is infinitely great, show that this face is the plane.Spacing d is by object space Z along optical axis direction
OBJThe beginning front is with respect to the distance of back, and effective aperture is the maximum effectively clear aperture of each face, and wherein all numerical value of radius-of-curvature and spacing d are measurement unit with millimeter (mm) all.
Table 1
| Indicate | Describe | Radius-of-curvature (R) | Spacing (d) | Material | Clear aperture | The |
| 61 | Light hurdle face | ∞ | 0.4932756 | 1.991034 | 0 | |
| 12 | First aspheric surface | 2.880773 | 1.357077 | L- |
2.897419 | 0 |
| 13 | Second aspheric surface | -6.15469 | 0.5391659 | 3.190658 | 0 | |
| 22 | The 3rd aspheric surface | -1.808925 | 0.9257925 | POLYC ARB | 3.132994 | 0 |
| 23 | The 4th aspheric surface | -5.932357 | 0.8714528 | 3.260389 | 0 | |
| 32 | The 5th aspheric surface | 3.85499 | 1.906173 | L- |
4.364236 | 0 |
| 33 | The 6th aspheric surface | 4.702808 | 0.6947408 | 5.772242 | 0 | |
| 42 | The first parallel-plate face | ∞ | 0.4 | B270 | 6.104326 | 0 |
| 44 | The second parallel-plate face | ∞ | 0.6071163 | 6.196302 | 0 | |
| 52 | Imaging surface | ∞ | 6.419322 | 0 |
z＝cr
2/{1+〔1-(1+k)c
2r
2〕
1/2}+a
1r
2+a
2r
4+a
3r
6+a
4r
8+a
5r
10+a
6r
12...
(1)
Wherein: z is for being starting point with each aspheric surface 12,13,22,23,32,33 and optical axis O intersection point, the axial value of vertical optical axis O direction, i.e. and minute surface depth value is because of its shape of selected lens is the axisymmetric eyeglass, so this aspheric surface formula is all got the even item.Wherein each aspheric surface the 12,13,22,23,32, the 33rd is determined aspheric shape by above formula; K is the quadric surface coefficient; C=1/R, wherein R is a minute surface curvature of centre radius, c is the minute surface curvature of centre; R is the minute surface centre-height; a
1, a
2, a
3, a
4, a
5, a
6Be asphericity coefficient, coefficient is got a in the preferred embodiment
1, a
2, a
3, a
4, a
5When using this aspheric surface formula (1), wherein minute surface curvature of centre radius R value and quadric surface coefficient k value be with reference to table 1, asphericity coefficient a
1, a
2, a
3, a
4, a
5For numerical value with reference to table 2.
Table 2
| Indicate | The surface | a 1 | a 2 | a 3 | a 4 | a 5 |
| 12 | First aspheric surface | 0 | -0.0084301354 | -0.0011196061 | -0.0021893156 | 1.0012117×10 -5 |
| 13 | Second aspheric surface | 0 | -0.033177193 | 0.0029052762 | -0.0028364046 | 0.00065850478 |
| 22 | The 3rd aspheric surface | 0 | -0.0019052091 | 0.046182199 | -0.016919733 | 0.0036090832 |
| 23 | The 4th aspheric surface | 0 | -0.015566205 | 0.030739825 | -0.0060871817 | 0.00064994859 |
| 32 | The 5th aspheric surface | 0 | -0.039817266 | 0.0066501766 | -0.0010095699 | -5.366867×10 -5 |
| 33 | The 6th aspheric surface | 0 | -0.023818192 | 0.0016687546 | -0.00014640093 | 3.6781657×10 -6 |
The effective focal length of the utility model camera lens 10 is f=5.575mm, and relative aperture is F/#=2.8, and the full field angle of whole optical system is 59.4 °, makes it easy to be integrated in the mobile phone.
Please refer to Fig. 2 A and Fig. 2 B, its camera lens 10 meridianal curvature of fields and the sagitta of arc curvature of field are greater than negative 0.2mm, and less than 0.2mm, optical distortion less than 1%, is all satisfied the requirement of imaging performance greater than bearing 1%.
See also Fig. 3, half is maximum image height for the diagonal line of definition CMOS useful area, is made as 1.0 visual fields, for measuring the spatial frequency of different image heights, gets 0.8 visual field, 0.6 visual field, 0 visual field.The CMOS diagonal line is 3.18mm in the present embodiment, i.e. the image height of 1.0 visual fields, and the image height of 0.8 visual field is 3.18 * 0.8=2.544, the image height 3.18 * 0.6=1.908 of 0.6 visual field, the image height of 0 visual field is 0mm, is the CMOS central point.Among the MTF figure corresponding with it, have seven lines, one is image height 0mm, its tangential T (Tangential) and radially S (sagittal) overlap other image height 1.908mm, the corresponding respectively tangential T of 2.544mm, 3.108mm and two lines of S radially.From spatial frequency, its spatial frequency of central point resolution 1601p/mm, MTF＞40% above (not shown on the figure), other 0.6 visual field, 0.8 visual field, the spatial frequency values at place, 1.0 visual fields all satisfies the requirement of resolution of lens.
Referring to Fig. 4, its relative exposure value＞50%, common relative exposure＞50%, human eye is difficult for finding out difference.
Be appreciated that because of computational accuracy and consider that the lens institute of digital camera lens gets behind the radix point six to parameter list, but after rounding up, still belongs to scope of the present utility model in the scope of 2 significant digits.The asphericity coefficient table asphericity coefficient of the aspheric surface formula of digital camera lens lens is got behind the radix point 13, and significant figure are got behind the radix point eight, but after rounding up, still belong to scope of the present utility model behind the radix point in four the scope.
This digital camera lens can be applicable to the digital camera lens module, be appreciated that, the utility model digital camera lens is not limited only to be applied in the mobile phone, it also can be applicable in other portable electron device, as video camera, camera, PDA (personal digitalassistant) etc.
Claims (9)
1. digital camera lens, it comprises one first lens from the object side to the image side successively, one second lens, one the 3rd lens, it is characterized in that: these first lens are biconvex double-sized non-spherical positive lens, comprise first aspheric surface and second aspheric surface, and it is made by glass material; These second lens are concavo-convex double-sized non-spherical negative lens, comprise the 3rd aspheric surface and the 4th aspheric surface, and it is made by plastic cement material; The 3rd lens are two-sided aspheric surface positive lens with wave-like, comprise the 5th aspheric surface and the 6th aspheric surface; It is made by glass material.
2. digital camera lens as claimed in claim 1 is characterized in that: these first lens, second lens, the 3rd lens are the axisymmetric eyeglass.
3. digital camera lens as claimed in claim 1 is characterized in that: this first index of refraction in lens is greater than 1.5 less than 1.6, and abbe number is greater than 55, less than 65.
4. digital camera lens as claimed in claim 1 is characterized in that: this second index of refraction in lens is greater than 1.45 less than 1.6, and abbe number is greater than 25, less than 35.
5. digital camera lens as claimed in claim 1 is characterized in that: the 3rd index of refraction in lens is greater than 1.65 less than 1.75, and abbe number is greater than 50, less than 60.
6. digital camera lens as claimed in claim 1 is characterized in that: this digital camera lens further comprises a parallel-plate, and it places the back of the 3rd lens, and it is made by glass material.
7. digital camera lens as claimed in claim 6 is characterized in that: at least one coating surface of parallel-plate has IR-cut filter membrane (IR-CUT Coating).
8. digital camera lens as claimed in claim 1 is characterized in that: at least one coating surface of first lens, the 3rd lens has IR-cut filter membrane (IR-CUT Coating).
9. digital camera lens module, comprise Yi Guanglan, one parallel-plate, one Image Sensor, this light hurdle has a smooth hurdle face, this parallel-plate has the first parallel-plate face and the second parallel-plate face, this Image Sensor has an imaging surface, it is characterized in that: this digital camera lens module further comprises a digital still camera lenses, this digital camera lens, it comprises one first lens from the object side to the image side successively, one second lens, one the 3rd lens, these first lens are biconvex double-sized non-spherical positive lens, comprise first aspheric surface and second aspheric surface, it is made by glass material; These second lens are concavo-convex double-sized non-spherical negative lens, comprise the 3rd aspheric surface and the 4th aspheric surface, and it is made by plastic cement material; The 3rd lens are two-sided aspheric surface positive lens with wave-like, comprise the 5th aspheric surface and the 6th aspheric surface; It is made by the glass/glass material; This digital camera lens parameter is
Describe Radius-of-curvature (R) Apart from value (d) Material Clear aperture The K value
Light hurdle face ∞ 0.4932756 1.991034 0
First aspheric surface 2.880773 1.357077 L-BAL42 2.897419 0
Second aspheric surface -6.15469 0.5391659 3.190658 0
The 3rd aspheric surface -1.808925 0.9257925 POLYCARB 3.132994 0
The 4th aspheric surface -5.932357 0.8714528 3.260389 0
The 5th aspheric surface 3.85499 1.906173 L-LAL13 4.364236 0
The 6th aspheric surface 4.702808 0.6947408 5.772242 0
The first parallel-plate face ∞ 0.4 B270 6.104326 0
The second parallel-plate face ∞ 0.6071163 6.196302 0
Imaging surface ∞ 6.419322 0
Asphericity coefficient is
The surface a
1 a
2 a
3 a
4 a
5
First aspheric surface 0 -0.0084301354 -0.0011196061 -0.0021893156 1.0012117×10
-5
Second aspheric surface 0 -0.033177193 0.0029052762 -0.0028364046 0.00065850478
The 3rd aspheric surface 0 -0.0019052091 0.046182199 -0.016919733 0.0036090832
The 4th aspheric surface 0 -0.015566205 0.030739825 -0.0060871817 0.00064994859
The 5th aspheric surface 0 -0.039817266 0.0066501766 -0.0010095699 -5.366867×10
-5
The 6th aspheric surface 0 -0.023818192 0.0016687546 -0.00014640093 3.6781657×10
-6
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420072107 CN2731485Y (en) | 2004-07-24 | 2004-07-24 | Lens of digital camera and digital camera module using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420072107 CN2731485Y (en) | 2004-07-24 | 2004-07-24 | Lens of digital camera and digital camera module using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2731485Y true CN2731485Y (en) | 2005-10-05 |
Family
ID=35051815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420072107 Expired - Lifetime CN2731485Y (en) | 2004-07-24 | 2004-07-24 | Lens of digital camera and digital camera module using the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2731485Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102289048A (en) * | 2010-06-15 | 2011-12-21 | 夏普株式会社 | Lens element, imaging lens, and imaging module |
| US8520127B2 (en) | 2009-10-08 | 2013-08-27 | Sharp Kabushiki Kaisha | Image pickup lens comprising aperture stop and single lens, image pickup module comprising image pickup lens including aperture stop and single lens, method for manufacturing image pickup lens comprising aperture stop and single lens, and method for manufacturing image pickup module comprising image pickup lens including aperture stop and single lens |
| CN104391368A (en) * | 2014-10-17 | 2015-03-04 | 浙江舜宇光学有限公司 | Three-plate type camera lens |
| CN106470792A (en) * | 2014-12-03 | 2017-03-01 | 大族激光科技产业集团股份有限公司 | 3D printer, Method of printing and camera lens module |
| US9804360B2 (en) | 2014-10-17 | 2017-10-31 | Zhejiang Sunny Optics Co., Ltd. | Lens assembly |
-
2004
- 2004-07-24 CN CN 200420072107 patent/CN2731485Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8520127B2 (en) | 2009-10-08 | 2013-08-27 | Sharp Kabushiki Kaisha | Image pickup lens comprising aperture stop and single lens, image pickup module comprising image pickup lens including aperture stop and single lens, method for manufacturing image pickup lens comprising aperture stop and single lens, and method for manufacturing image pickup module comprising image pickup lens including aperture stop and single lens |
| CN102289048A (en) * | 2010-06-15 | 2011-12-21 | 夏普株式会社 | Lens element, imaging lens, and imaging module |
| CN104391368A (en) * | 2014-10-17 | 2015-03-04 | 浙江舜宇光学有限公司 | Three-plate type camera lens |
| US9804360B2 (en) | 2014-10-17 | 2017-10-31 | Zhejiang Sunny Optics Co., Ltd. | Lens assembly |
| CN106470792A (en) * | 2014-12-03 | 2017-03-01 | 大族激光科技产业集团股份有限公司 | 3D printer, Method of printing and camera lens module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140724 Granted publication date: 20051005 |