CN2695994Y - Digital camera lens - Google Patents

Digital camera lens Download PDF

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Publication number
CN2695994Y
CN2695994Y CN 200420043494 CN200420043494U CN2695994Y CN 2695994 Y CN2695994 Y CN 2695994Y CN 200420043494 CN200420043494 CN 200420043494 CN 200420043494 U CN200420043494 U CN 200420043494U CN 2695994 Y CN2695994 Y CN 2695994Y
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China
Prior art keywords
lens
aspheric surface
digital camera
camera lens
parallel
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Expired - Lifetime
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CN 200420043494
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Chinese (zh)
Inventor
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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Priority to CN 200420043494 priority Critical patent/CN2695994Y/en
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Abstract

The utility model discloses a digital camera lens, comprising a first lens, a second lens, and a third lens from position of object sequentially. The first lens is a convex object space and two-sided aspherical positive lens, comprising a first aspheric surface and a second aspheric surface. The second lens is a concavo-convex and two-sided aspherical negative lens, comprising a third aspheric surface and a fourth aspheric surface. The third lens is a convex image space and two-sided aspherical positive lens, comprising a fifth aspheric surface and a sixth aspheric surface. The first lens, the second lens, and the third lens that are all axisymmetric type lens, all adopt plastic as material quality. The utility model completely adopts aspherical design, which simplifies the structure and improves the image-forming quality. And in addition, the digital camera lens adopts plastic as material quality, which has a lighter weight and a simple preparing process, and the cost of processing is reduced, the impact resistance is enhanced.

Description

Digital camera lens
[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.
[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 be because of can realizing being shooting function, and is easy to use and more and more be subjected to numerous users' favor.Because of the mobile phone volume is little, so the lens module of digital camera that requires to be installed in the mobile phone has smaller size smaller.When people pursued miniaturization to mobile phone with digital-code camera module, wishing had higher image quality to the object of its shooting, and the image quality of object depends on the quality of digital camera lens design to a great extent.
In the prior art, the camera lens of digital camera generally adopts glass material, and its lens are spherical lens, because of spherical lens inevitably can produce aberration, thereby needs a plurality of lens just can reach the requirement of respective performances.Yet increasing of lens numbers will increase the volume and weight of camera lens, also will increase the manufacturing cost of camera lens simultaneously.
For volume and the manufacturing cost that reduces camera lens, the camera lens of existing digital camera adopts the part non-spherical lens, non-spherical lens can be avoided using under the less eyeglass situation, just satisfying optical property preferably simultaneously because of adopting the spherical aberration that spherical lens produced.But non-spherical lens is in early days the time, because of manufacturing technology prematurity still, so this kind non-spherical lens can't be produced.Along with precision optical machinery and the continuous evolution of process technology, nowadays can utilize Ultraprecision Machining, plastics emission technology and glass moulding technology to finish the manufacturing of non-spherical lens.
Because of non-spherical lens has its distinctive optical benefits, in existing camera lens, spherical mirror and aspheric mirror are used and have obtained using widely.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 are the spherical glass eyeglass, and the 3rd lens are that the two sides is aspheric glass lens.Announce the camera lens that is disclosed for No. 01272836 in the Chinese patent on September 18th, 2002, its optical module comprises first lens, one second lens and one the 3rd lens, wherein first lens are the double convex glass eyeglass, the surface of second, third lens has an aspheric surface at least, and the material of second, third lens is plastics.After adopting above-mentioned structure,,, will increase camera lens weight thus, and the use of glass material makes its impact resistance relatively poor because of wherein spherical lens is a glass material though can reduce eyeglass quantity.
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 are the spherical glass eyeglass; second, third is the plastic aspherical element eyeglass, and its glass material eyeglass places the front of camera lens, although its better protect glass lens thereafter; but the use of glass material has increased the weight of this camera lens, has reduced impact resistance.In addition, although this camera lens volume is less, yet the sensing element that it only is suitable for 640 * 480 pixels be used, can't satisfy the requirement of current growing higher pixel.
In sum, provide the digital camera lens that a kind of volume is less, image quality is high and manufacturing cost is lower real for necessary.
[summary of the invention]
The purpose of this utility model be to provide a kind of volume is less, image quality is high and the portable electron device of low cost of manufacture with the camera lens of digital camera.
Another purpose of the present utility model is to provide the digital-code camera module of using this digital 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 protruding in object space double-sized non-spherical positive lens, comprise first aspheric surface and second aspheric surface, second lens are concavo-convex double-sized non-spherical negative lens, comprise the 3rd aspheric surface and the 4th aspheric surface, the 3rd lens are protruding in picture side's double-sized non-spherical positive lens, comprise the 5th aspheric surface and the 6th aspheric surface.First lens, second lens, the 3rd lens shape are the axisymmetric eyeglass, and its material is plastics and makes.
Compared with prior art, the utility model digital camera lens, it adopts the aspheric surface design fully, thereby can be by optimizing aspheric coefficient, revise various aberrations, also can avoid spherical aberration because of adopting spherical mirror to produce, thus simplified structure and improve image quality; In addition, the design of this digital camera lens, its optical full length is less than 6.5mm, and its module height can be less than 8mm, makes being incorporated in the mobile phone that it can be less, has satisfied the requirement of mobile phone microminiaturization preferably; In addition,, make its processing simple, reduced processing cost simultaneously, strengthen its impact resistance because of its lens adopt plastic material.
[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 from the object side to the image side successively.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 sensing component 5 behind the parallel-plate 4, and this image sensing component 5 comprises an imaging surface 52.
First lens 1 are protruding in object space double-sized non-spherical positive lens, comprise first aspheric surface 12 and second aspheric surface 13, and wherein first aspheric surface 12 is protruding in object space, and second aspheric surface 13 is irregular aspheric surface.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 picture side's 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 picture side.First lens 1, second lens 2, the 3rd lens 3 shapes are the eyeglass with optical axis O symmetry.
First lens 1, second lens 2, the 3rd lens 3 all adopt the optical plastic material, the refractive index of used optical plastic material and chromatic dispersion formula: 1.48＜n＜1.6,25＜v＜66 that need meet the following conditions respectively.Wherein first lens 1 and the 3rd lens 3 are preferentially selected ZEO-E48R for use, and its refractive index and chromatic dispersion are respectively n 1=1.529, v 1=55.8.The material of second lens 2 is polycarbonate (Polycarbonate is hereinafter to be referred as PC), and refractive index and chromatic dispersion are respectively n 2=1.585, v 2=29.9.ZEO-E48R is the E48R that adopts in the ZEONEX product that Nippon Zeon Co., Ltd. (Zeon) produces, because of this product is armorphous polyolefin transparent material, its products characteristics is that density is little, help the goods lightweight, and it has lower water-intake rate, because this kind material contains polarity and the little monomer of anisotropy, thereby armorphous transparent material birefraction is little, it belongs to the high-fire resistance transparent resin, and its glass temperature (Tg) reaches 140-170 ℃, and injection moulding and its erasibility are good easily.Because this optical material has lower birefraction, can show optical property preferably under high resolution.The two ends that first lens 1 that will be made by this material and the 3rd lens 3 place camera lens 10 in the middle of second lens 2 are placed, can effectively avoid camera lens 10 to be scratched.
Parallel-plate 4 is a sheet glass, comprises the first parallel-plate face 42 and the second parallel-plate face 44.Parallel-plate 4 in order to the protection image sensing component 5 imaging surface 52, the preferred B270 of its material, its refractive index and chromatic dispersion are respectively n 3=1.585, v 3=29.9.In addition,, come from infrared ray in the object reflection ray, thereby improve image quality with filtering at least one coating surface one deck IR-cut filter membrane (IR-cut Coating) of parallel-plate 4.
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 sensing component 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 sensing component of digital camera lens, in view of cost consideration, adopt CMOS usually.CMOS preferred pixel of the present utility model is of a size of 3.18 μ m, and pixel count is 1,300,000, and resolution reaches 1280 * 960 CMOS.
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 k value
61 Light hurdle face The plane -0.224323 1.746377 0
12 First aspheric surface 1.608003 0.97 ZEO-E48R 1.9 0
13 Second aspheric surface 11.09186 0.71 1.96 0
22 The 3rd aspheric surface -1.081442 0.74 POLYCARB 1.92 0
23 The 4th aspheric surface -1.793414 0.34 2.56 0
32 The 5th aspheric surface 4.486508 1.15 ZEO-E48R 3.72 0
33 The 6th aspheric surface 6.4367 0.3 4.36 0
42 The first parallel-plate face The plane 1 B270 4.549385 0
44 The second parallel-plate face The plane 0.8046701 4.860106 0
52 Imaging surface The plane 5.246404 0
First lens 1, second lens 2 and the 3rd lens 3 of the utility model digital camera lens 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 first aspheric surface 12, second aspheric surface 13, 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 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 -0.0014998128 -0.0014544729 0.0097889031 -0.013292858
13 Second aspheric surface 0 -0.0090224772 -0.049969463 0.060196683 -0.076405382
22 The 3rd aspheric surface 0 0.11533382 -0.11489175 0.32128915 -0.25269039
23 The 4th aspheric surface 0 0.050741673 0.027199214 0.013237802 -0.004234276
32 The 5th aspheric surface 0 -0.041556833 0.0047709134 0 0
33 The 6th aspheric surface 0 -0.037051946 0.00050793279 0 0
The effective focal length of the utility model camera lens 10 is f=4.889mm, relative aperture is F/#=2.789, diaphragm diameter is 1.746, the full field angle of whole optical system is 56o, its camera lens length overall is 6.01467mm, optical full length is less than 6.5mm, and its module height can make it easy to be integrated in the mobile phone less than 8mm.
Please refer to Fig. 2 A to Fig. 4, 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 1%, and less than 1%, among the MTF figure, the spatial frequency values of 160LP/MM satisfies the requirement of resolution of lens.Its relative exposure value＞55%, common relative exposure＞50%, human eye is difficult for finding out difference.
This digital camera lens can be applicable to lens module of digital camera, 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 (8)

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 is characterized in that: these first lens are protruding in object space double-sized non-spherical positive lens, comprise first aspheric surface and second aspheric surface; These second lens are concavo-convex double-sized non-spherical negative lens, comprise the 3rd aspheric surface and the 4th aspheric surface; The 3rd lens are protruding in picture side's double-sized non-spherical positive lens, comprise the 5th aspheric surface and the 6th aspheric surface.
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: these first lens, second lens, the 3rd lens material are plastic material, and the refractive index of this plastic material is greater than 1.48 less than 1.6, its chromatic dispersion greater than 25 less than 66.
4. digital camera lens as claimed in claim 3 is characterized in that: these first lens and the second lens plastic material are ZEO-E48R, and its refractive index is 1.529, and abbe number is 55.8; The second lens plastic material is polycarbonate (PC), and its refractive index is 1.585, and abbe number is 29.9.
5. digital camera lens as claimed in claim 1 is characterized in that: this digital camera lens further comprises Yi Guanglan, places the front of first lens.
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.
7. digital camera lens as claimed in claim 6 is characterized in that: parallel-plate has IR-cut filter membrane (IR-CUT Coating) towards object space face plating.
8. an application rights requires the digital-code camera module of 1 described digital camera lens, it comprises: Yi Guanglan, one digital camera lens, one parallel-plate, one image sensing component, this light hurdle has light hurdle face, this parallel-plate has the first parallel-plate face, the second parallel-plate face, this image sensing component 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 object space double-sized non-spherical positive lens, comprises first aspheric surface and second aspheric surface; 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 picture side's double-sized non-spherical positive lens, comprise the 5th aspheric surface, the 6th aspheric surface for protruding; Described digital camera lens parameter is
Describe Radius-of-curvature (R) Apart from value (d) Material Clear aperture The K value Light hurdle face The plane -0.224323 1.746377 0 First aspheric surface 1.608003 0.97 ZEO-E48R 1.9 0 Second aspheric surface 11.09186 0.71 1.96 0 The 3rd aspheric surface -1.081442 0.74 POLYCARB 1.92 0 The 4th aspheric surface -1.793414 0.34 2.56 0 The 5th aspheric surface 4.486508 1.15 ZEO-E48R 3.72 0 The 6th aspheric surface 6.4367 0.3 4.36 0 The first parallel-plate face The plane 1 B270 4.549385 0 The second parallel-plate face The plane 0.8046701 4.860106 0 Imaging surface The plane 5.246404 0
Asphericity coefficient is The surface a 1 a 2 a 3 a 4 a 5 First aspheric surface 0 -0.0014998128 -0.0014544729 0.0097889031 -0.013292858 Second aspheric surface 0 -0.0090224772 -0.049969463 0.060196683 -0.076405382 The 3rd aspheric surface 0 0.11533382 -0.11489175 0.32128915 -0.25269039 The 4th aspheric surface 0 0.050741673 0.027199214 0.013237802 -0.004234276 The 5th aspheric surface 0 -0.041556833 0.0047709134 0 0 The 6th aspheric surface 0 -0.037051946 0.00050793279 0 0
CN 200420043494 2004-03-06 2004-03-06 Digital camera lens Expired - Lifetime CN2695994Y (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100468182C (en) * 2005-05-06 2009-03-11 鸿富锦精密工业（深圳）有限公司 Composite lens system
US7738191B2 (en) 2005-09-29 2010-06-15 Fujinon Corporation Single focus lens
CN1940626B (en) * 2005-09-29 2012-08-29 富士能株式会社 Single focal point lens
CN103747168A (en) * 2013-12-31 2014-04-23 泉州市东南光电有限公司 High-efficient infrared light harvesting device matched with infrared camera
CN105093485A (en) * 2015-08-31 2015-11-25 苏州凯锝微电子有限公司 Mobile phone lens optical structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100468182C (en) * 2005-05-06 2009-03-11 鸿富锦精密工业（深圳）有限公司 Composite lens system
US7738191B2 (en) 2005-09-29 2010-06-15 Fujinon Corporation Single focus lens
CN1940626B (en) * 2005-09-29 2012-08-29 富士能株式会社 Single focal point lens
CN103747168A (en) * 2013-12-31 2014-04-23 泉州市东南光电有限公司 High-efficient infrared light harvesting device matched with infrared camera
CN105093485A (en) * 2015-08-31 2015-11-25 苏州凯锝微电子有限公司 Mobile phone lens optical structure

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CX01 Expiry of patent term

Expiration termination date: 20140306

Granted publication date: 20050427