CN100501486C - Lens of digital camera - Google Patents

Lens of digital camera Download PDF

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Publication number
CN100501486C
CN100501486C CNB2004100274031A CN200410027403A CN100501486C CN 100501486 C CN100501486 C CN 100501486C CN B2004100274031 A CNB2004100274031 A CN B2004100274031A CN 200410027403 A CN200410027403 A CN 200410027403A CN 100501486 C CN100501486 C CN 100501486C
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lens
digital camera
aspheric surface
camera lens
sphere
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CNB2004100274031A
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CN1704791A (en
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李俊佑
蔡明江
江宗韦
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Abstract

This invention camera lens includes a first lens, which is a double-sided spherical positive lens convex to the object including a first sphere and a second sphere made of glass materials, a second lens, which is a concave-convex double-sided non-spherical negative lens including a third non-sphere and a fourth sphere made of plastics and a third lens-a double sided non-spherical positive lens convex to the image including a fifth non-sphere and a sixth non-sphere made of plastics.

Description

Digital camera lens
[technical field]
The invention relates to a kind of digital camera lens, especially about a kind of digital camera lens that can be used with portable electron device.
[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.Mobile phone with 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), and general mobile phone uses the Image Sensor of digital camera lens to adopt CMOS, and the digital camera CMOS highest resolution in the existing mobile phone only is 1,300,000 pixels, when doing file processing, its resolution is still on the low side to some extent.As using the CMOS of higher pixel, then need design the digital camera lens that CMOS therewith is complementary.
In the prior art, the camera lens of digital camera generally adopts 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.
In order to reduce camera lens volume and manufacturing cost, part adopts non-spherical lens, non-spherical lens can avoid camera lens because of adopting the spherical aberration that spherical lens produced in the camera lens of existing digital camera, adopts less lens can satisfy its optical property preferably.But non-spherical lens is in early days the time, because of manufacturing technology prematurity still, so lens can't be produced.Along with precision optical machinery and the continuous evolution of process technology, nowadays can utilize Ultraprecision Machining, jet modling forming technique and glass moulding technology to reach the making of non-spherical lens.
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, behind the employing said structure, 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 were not all attained to the stage of ripeness, caused 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 pixel 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 all are spherical glass eyeglasses, and the 3rd lens two sides is the aspheric surface plastic lens.After adopting said structure, though can reduce eyeglass quantity, lens wherein have two sheet glass eyeglasses, so increased camera lens weight.
The digital camera lens of another available technology adopting part aspherical lens, as announce in the United States Patent (USP) the 6th on August 27th, 2002, the camera lens that is disclosed for 441, No. 971, 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, only are suitable for 640 * 480 pixels following CMOS or CCD, can't satisfy current growing higher pixel requirement.
In sum, provide that a kind of logical photosensitiveness is good, image quality is high and the digital camera lens of low cost of manufacture very necessary.
[summary of the invention]
The object of the present invention is to provide that a kind of logical photosensitiveness is good, image quality is high and the portable electron device digital camera lens of low cost of manufacture.
Another object of the present invention is to provide the numerical camera mould of using this digital camera lens.
The present invention is a kind of digital camera lens, and it comprises one first lens successively from object space, one second lens, one the 3rd lens and a smooth hurdle.First lens are protruding in the two-sided sphere positive lens of object space, comprise first sphere and second sphere, 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 protruding in object space double-sized non-spherical positive lens, comprise the 5th aspheric surface and the 6th aspheric surface, its material is a plastic cement, and this light hurdle is arranged on the front of first lens.
Compare prior art, digital camera lens of the present invention adopts spherical glass eyeglass and aspheric surface plastic lens, and glass mirror guarantees its logical preferably optical property, makes it under the relatively poor situation of light, also can guarantee imaging effect; The part eyeglass adopts the aspheric surface design, thereby can revise various aberrations by optimizing aspheric coefficient, also can avoid the spherical aberration because of adopting spherical mirror to produce, simplified structure and improve image quality; Digital camera lens design in this two mega pixel, its optical full length be less than 7.65mm, and its module height can be less than 9mm, makes being integrated in the mobile phone that it can be less, satisfied the requirement of mobile phone microminiaturization preferably; Because of adopting glass mirror, processing is simple, cuts down finished cost.
[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]
See also Fig. 1, it comprises one first lens 1, one second lens 2, the 3rd lens 3 and a glass plate 4 successively from object space to picture side digital camera lens of the present invention 10.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 glass plate, and this Image Sensor 5 comprises an imaging surface 52.
First lens 1 are protruding in the two-sided sphere positive lens of object space, comprise first sphere 12 and second sphere 13, and wherein first sphere 12 is protruding in object space, and second sphere 13 is the bigger sphere of curvature, almost plane.Second lens 2 are concavo-convex double-sized non-spherical negative lens, comprise the 3rd aspheric surface 22 and the 4th aspheric surface 23, and wherein the 3rd aspheric surface 22 and the 4th non-spherical surface 23 are all protruding in picture side.The 3rd lens 3 are protruding in object space double-sized non-spherical positive lens, comprise the 5th aspheric surface 32 and the 6th aspheric surface 33, and wherein the 5th aspheric surface 32 is the bigger aspheric surface of curvature, and the 6th aspheric surface 33 is protruding in object space.First lens 1, second lens 2, the 3rd lens 3 shapes are all the eyeglass with optical axis O symmetry.
First lens 1 adopt glass material, the refractive index of used optical glass material and chromatic dispersion formula: 1.55＜n＜1.6 that need meet the following conditions respectively, 55＜v＜65, its first lens 1 can adopt the glass of BACD5, N-SK5, S-BAL35, above type of glass is the commaterial that different company produces, and its refractive index is all identical with chromatic dispersion.This lens element material adopts BACD5, and refractive index and chromatic dispersion are respectively n 1=1.589, v 1=61.3.
Second lens 2 adopt the optics plastic materials, the refractive index of used optics plastic material and chromatic dispersion formula: 1.55＜n＜1.65,20＜v＜30 that meet the following conditions.Second lens, 2 materials preferentially adopt OKP4, and refractive index and chromatic dispersion are respectively n 2=1.607, v 2=26.646.The 3rd lens 3 adopt the optics plastic materials, the refractive index of used optics plastic material and chromatic dispersion formula: 1.5＜n＜1.6,50＜v＜60 that meet the following conditions.The 3rd lens 3 materials preferentially adopt ZEO-E48R, and refractive index and chromatic dispersion are respectively n 3=1.5299, v 3=55.866.First lens 1 of glass material are placed the front of second lens 2 and the 3rd lens 3, can make first lens, 1 better protect lens thereafter, avoid being scratched.
Glass plate 4 is a sheet glass, comprises first glass-board surface 42 and second glass-board surface 44.Glass 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=1.585, v 4=29.9.In addition, glass plate 4 at least one coating surface one deck IR-cut filter membranes (IR-cut Coating) so that filtering comes from the infrared ray in the object reflection ray, thereby improve image quality.
Light hurdle 6 is positioned on the object space position, comprises light hurdle face 61, and before it placed first lens 1, it can directly utilize the perforate size control light-inletting quantity of aperture.The Image Sensor 5 that comprises imaging surface 52 can be charge-coupled device (Charge Coupled Device usually, call CCD in the following text), perhaps complementarity matal-oxide semiconductor (Complementary Metal-OxideSemiconductor, call CMOS in the following text), and the general mobile phone Image Sensor of digital camera lens, because of the consideration of cost, adopt CMOS usually.In the concrete preferred embodiment, cmos pixel is of a size of 3.18 μ m, and pixel count is two mega pixels, and resolution reaches 1600 * 1200.
See also table 1, the related parameter values of digital camera lens optical system of the present invention, 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 each face and optical axis O surface of intersection, when curvature is infinitely great, shows 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
Figure C200410027403D00081
Second lens 2 of the utility model digital camera lens and the 3rd lens 3 are the non-spherical lens with optical axis O symmetry, and it can improve the lens imaging performance by adjusting asphericity coefficient.Wherein the design of the 3rd aspheric surface 22, the 4th aspheric surface 23, the 5th aspheric surface 32, the 6th aspheric surface 33 all need be satisfied following preferred aspheric surface formula:
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 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 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
22 The 3rd aspheric surface 0 9.5494194× 10 -2 8.9080116× 10 -3 -7.4937965× 10 -3 3.4572041× 10 -3
23 The 4th aspheric surface 0 4.5004478× 10 -2 2.0677521× 10 -3 1.2379288× 10 -3 -2.9332958× 10 -4
32 The 5th aspheric surface 0 -2.4977468× 10 -2 1.696005× 10 -3 -1.0887752× 10 -4 8.4327017× 10 -6
33 The 6th aspheric surface 0 -1.8264536× 10 -2 6.445108× 10 -4 -5.9154654× 10 -5 3.5485467× 10 -6
Digital camera lens 10 effective focal lengths of the present invention are f=5.99mm, relative aperture is F/#=2.8, diaphragm diameter is 2.139, the full field angle of whole optical system is 55.9263 °, its camera lens length overall is 7.65637mm, its module height can be less than 9mm, makes being integrated in the mobile phone that it can be less.
Please refer to Fig. 2 A to Fig. 4
Figure C200410027403D0009153138QIETU
Its camera lens 10 meridianal curvature of fields and the sagitta of arc curvature of field are less than 0.1mm, and optical distortion is greater than bearing 0.5%, and less than 0.5%, among the MTF figure, the spatial frequency values of 160LP/MM satisfies the requirement of resolution of lens.Its relative exposure value〉50%, common relative exposure〉50%, human eye is difficult for finding out the difference of this camera lens edge and center imaging.
Be appreciated that because of sphere 13 curvature of first lens 1 are bigger almost plane, so can be at this face plating one deck IR-cut filter membrane (IR-cut Coating), come filtering to come from infrared ray in the object reflection ray, thereby can save glass plate 4, can reduce the module height of camera lens 10.
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 invention in the scope of 2 significant digits.In the aspheric surface formula that the lens of digital camera lens adopt, the asphericity coefficient of asphericity coefficient table 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 invention behind the radix point in four the scope.
Digital camera lens of the present invention can be applicable to the digital camera lens module, be appreciated that, digital camera camera lens of the present invention is not limited only to be applied in the mobile mobile phone, it also can be applicable in other portable electronic equipment, 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 and a smooth hurdle, it is characterized in that: these first lens are protrudingly to comprise first sphere and second sphere to the two-sided sphere positive lens of object space, and this eyeglass 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 this eyeglass is made by plastic cement material; The 3rd lens are protruding in object space double-sized non-spherical positive lens, comprise the 5th aspheric surface and the 6th aspheric surface, and this eyeglass is made by plastic cement material, and this light hurdle is arranged on the front of first lens.
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: the refractive index of these first lens is greater than 1.55 less than 1.6, its chromatic dispersion greater than 55 less than 65.
4. digital camera lens as claimed in claim 1 is characterized in that: the refractive index of these second lens is 1.607, and its chromatic dispersion is 26.646.
5. digital camera lens as claimed in claim 1 is characterized in that: the refractive index of the 3rd lens is 1.5299, and its chromatic dispersion is 55.866.
6. digital camera lens as claimed in claim 1 is characterized in that: this digital camera lens further comprises a glass plate, and it places the back of the 3rd lens.
7. digital camera lens as claimed in claim 6 is characterized in that: glass plate has IR-cut filter membrane (IR-CUT Coating) towards object space face plating.
8. an application rights requires the numerical camera mould of 1 described digital camera lens, it comprises: Yi Guanglan, a digital camera lens, a glass plate, one Image Sensor, this light hurdle has light hurdle face, and this glass plate has first glass-board surface, second glass-board surface, this Image Sensor has an imaging surface, it is characterized in that: this digital camera lens comprises one first lens successively from object space to picture side, and it is protruding in the two-sided sphere positive lens of object space, comprises first sphere and second sphere; One second lens, it is concavo-convex double-sized non-spherical negative lens, comprises the 3rd aspheric surface and the 4th aspheric surface; One the 3rd lens to object space double-sized non-spherical positive lens, comprise the 5th aspheric surface, the 6th aspheric surface for protruding; Described digital camera lens parameter is
Figure C200410027403C00031
, wherein k is expressed as the quadric surface coefficient.
9. digital camera lens as claimed in claim 8, it is characterized in that: asphericity coefficient is
Indicate The surface a 1 a 2 a 3 a 4 a 5 22 The 3rd aspheric surface 0 9.5494194× 10 -2 8.9080116× 10 -3 -7.4937965× 10 -3 3.4572041× 10 -3 23 The 4th aspheric surface 0 4.5004478× 10 -2 2.0677521× 10 -3 1.2379288× 10 -3 -2.9332958× 10 -4 32 The 5th aspheric surface 0 -2.4977468× 10 -2 1.696005× 10 -3 -1.0887752× 10 -4 8.4327017× 10 -6 33 The 6th aspheric surface 0 -1.8264536× 10 -2 6.445108× 10 -4 -5.9154654× 10 -5 3.5485467× 10 -6
CNB2004100274031A 2004-05-25 2004-05-25 Lens of digital camera Expired - Fee Related CN100501486C (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103135198B (en) * 2011-11-24 2016-03-02 比亚迪股份有限公司 A kind of optical lens assembly
CN104062747A (en) * 2014-07-14 2014-09-24 沈阳敏像科技有限公司 Three-lens five-mega-pixel front camera of mobile phone

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6490102B1 (en) * 2000-05-12 2002-12-03 Yeo-Chih Huang Hybrid lens system
CN2577302Y (en) * 2002-11-08 2003-10-01 玉晶光电(厦门)有限公司 Lens group
CN1447144A (en) * 2002-03-25 2003-10-08 柯尼卡株式会社 Image trapping lens, image trapper, and image trapping unit
WO2004038478A1 (en) * 2002-10-25 2004-05-06 Nagano Optics Laboratory Corporation Imaging lens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6490102B1 (en) * 2000-05-12 2002-12-03 Yeo-Chih Huang Hybrid lens system
CN1447144A (en) * 2002-03-25 2003-10-08 柯尼卡株式会社 Image trapping lens, image trapper, and image trapping unit
WO2004038478A1 (en) * 2002-10-25 2004-05-06 Nagano Optics Laboratory Corporation Imaging lens
CN2577302Y (en) * 2002-11-08 2003-10-01 玉晶光电(厦门)有限公司 Lens group

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