CN1673795A - Digital camera lens - Google Patents

Digital camera lens Download PDF

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Publication number
CN1673795A
CN1673795A CN 200410026704 CN200410026704A CN1673795A CN 1673795 A CN1673795 A CN 1673795A CN 200410026704 CN200410026704 CN 200410026704 CN 200410026704 A CN200410026704 A CN 200410026704A CN 1673795 A CN1673795 A CN 1673795A
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China
Prior art keywords
lens
digital camera
camera lens
aspheric
curvature
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Granted
Application number
CN 200410026704
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Chinese (zh)
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CN100376915C (en
Inventor
孙文信
李俊佑
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Nantong Tianmu Insulating Composite Materials Co ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Priority to CNB2004100267042A priority Critical patent/CN100376915C/en
Publication of CN1673795A publication Critical patent/CN1673795A/en
Application granted granted Critical
Publication of CN100376915C publication Critical patent/CN100376915C/en
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Abstract

The digital camera lens includes the first lens, which is biconvex two-sided aspherical lens made of glass material; the second lens, which includes one aspherical surface concave to object space and made of plastic; and the third lens, which includes two aspherical surfaces and made of plastic arranged successively from the object space to the image space. Adopting aspherical lenses in the digital camera lens makes it possible to correct various kinds of optical aberration. In addition, the digital camera lens with only three aspherical lenses can reach the requirement of high pixels.

Description

Digital camera lens
[technical field]
The invention relates to a kind of mobile phone digital camera lens that can be complementary with high pixel image sensing component.
[background technology]
Along with Development of Multimedia Technology, digital camera, video camera more and more are consumers in general's favor, people's logarithmic code camera, video camera are more and more pursued its miniaturization, simultaneously because mobile phone is compact, easy to carry, people wish to realize the function of acquisition object image on mobile phone, and obtain clear picture, need to design and produce the digital camera lens that can be easily installed in the mobile phone thus.Because of the mobile phone volume less, so the volume that digital camera lens within it is installed is had higher requirement, be that the digital camera lens volume that this kind mobile phone is used needs littler, thereby also higher requirement is proposed its quality of image of shooting object, the image frame of its shot object is still clear when being volume-diminished, and the image quality of object depends on the quality of each optical device in the digital camera to a great extent.
The resolution of the digital camera lens in the existing mobile phone generally is 350,000 pixels, lack of resolution, and image fog during shooting, corresponding photograph is clear inadequately attractive in appearance.Therefore we will develop next-generation: replace the prior mobile phone camera lens with 1,300,000 pixel camera lenses.Generally speaking, non-spherical lens can partly reduce in the camera lens because of the caused spherical aberration of spherical lens, and can reduce the volume of camera lens, in the therefore existing lens design, usually by adopting the part non-spherical lens, realize reducing the purpose that the camera lens volume reaches better optical property simultaneously.
On October 1st, 2003, the Chinese patent of bulletin disclosed a kind of digital camera lens that adopts the part non-spherical lens for 02258384.X number, this digital camera lens comprises one first lens, one second lens and one the 3rd lens, these first lens are spherical glass lens, second lens are falcate plastic lenss, and the 3rd lens are that the two sides is all aspheric plastic lens.
The United States Patent (USP) the 6th that on August 27th, 2002 was announced; 441; disclosed the digital camera lens of another kind of employing part non-spherical lens for No. 971; this digital camera lens comprises one first lens, one second lens and one the 3rd lens successively by object space; these first lens are glass lenss that a two sides is sphere; second lens and the 3rd lens all are plastic aspherical element lens; though these first lens better protect this camera lens to avoid scratch; but maximum pixel only can reach 640 pixels * 480 pixels, can't satisfy the requirement of current growing higher pixel thus.
In view of above shortcoming, provide a kind of image quality height, volume is little and manufacturing cost is lower digital camera lens real for necessary.
[summary of the invention]
The object of the present invention is to provide a kind of image quality height, volume is little and manufacturing cost is lower digital camera lens.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: digital camera lens of the present invention, comprise one first lens from the object side to the image side successively, one second lens and one the 3rd lens, first lens are biconvex double surface non-spherical lens, it is made by glass material, and second lens are that first surface is a recessed aspheric surface to object space, and it is made by plastic material, the 3rd lens comprise two aspheric surfaces, and it is made by plastic material.
The invention has the beneficial effects as follows: digital camera lens of the present invention all adopts non-spherical lens, thereby can revise various optical aberrations, as spherical aberration, coma, astigmatism, the curvature of field and distortion etc.In addition, digital camera lens of the present invention can be realized the high pixel volume little requirement of mobile phone with digital camera lens only by three non-spherical lenses.In addition, first lens of digital camera lens of the present invention adopt glass material, make the camera lens can anti-extraneous humidity and high temperature, can also make the camera lens scratch resistance wear-resisting.In addition, second lens and the 3rd lens of digital camera lens of the present invention all select to adopt plastic material, have reduced weight and its manufacturing cost of digital camera lens to a great extent.
[description of drawings]
Fig. 1 is the structural representation of digital camera lens of the present invention;
Fig. 2 is the MTF figure of digital camera lens of the present invention;
Fig. 3 A is the curvature of field figure of digital camera lens of the present invention;
Fig. 3 B is the optical distortion figure of digital camera lens of the present invention;
Fig. 4 is the relative exposure figure of digital camera lens of the present invention.
[embodiment]
Please refer to Fig. 1, digital camera lens of the present invention comprises one first lens 1, one second lens 2, one the 3rd lens 3 and eyeglass 4, wherein a Z successively by object space 1Represent object space, Z 2Representative picture side, this digital camera lens also comprises one at first lens, 1 close object space Z 1The diaphragm 5 that is provided with of a side, this diaphragm 5 is used to adjust by extraneous object and reflexes to light-inletting quantity in this digital camera lens.In addition, at eyeglass 4 close picture side Z 2A side be provided with an image sensing component 6, this image sensing component 6 comprises an image sensor surface 61.
First lens 1 are a biconvex double surface non-spherical lens, comprise two aspheric surfaces 12,14, and wherein aspheric surface 12 is protruding in object space, and aspheric surface 14 is recessed to object space, and these first lens 1 are positive lenss and are made by glass, and it can anti-extraneous humidity, high temperature, scratch resistance and wear-resisting.This first lens, 1 used glass material is a moulded glass, its refractive index n D1And chromatic dispersion v D1Formula: 1.5＜n need meet the following conditions D1＜1.62,56＜v D1＜66, wherein this glass material is preferable over L-BAL42, and its refractive index and chromatic dispersion are respectively: n D1=1.58313, V D1=59.4.In addition, can be at least one coating surface one IR-cut filter membrane (IR-cutCoating) of these first lens 1, so that stop the infrared ray in the light that comes from the object reflection to enter image sensing component 6, avoid that infrared ray is incident on the image sensor surface 61 of image sensing component 6 when normal photographing, produce noise thereby cause to disturb.
Second lens 2 comprise two aspheric surfaces 22,24, and wherein first aspheric surface 22 is recessed to object space, and it is a negative lens and is made of plastics.Because of thereby the optical plastic material can present high resolving power because of having low-birefringence, and consider for aspheric surface, general optical plastic material can be any of acryl resin (acrylic resin), epoxy resin (epoxy resin), poly-carbonic acid (polycarbonate is called for short PC) etc.The refractive index n of these second lens, 2 used plastic materials D2And chromatic dispersion v D2Formula: 1.55＜n need meet the following conditions respectively D2＜1.65,25＜v D2＜36.Second lens, 2 used plastics are preferable over poly-carbonic acid (polycarbonate is called for short PC), and its refractive index and chromatic dispersion are respectively: n D2=1.58547, v D2=29.9.
The 3rd lens 3 comprise two aspheric surfaces 32,34, and this two aspheric surface 32,34 is wave-like and with respect to optical axis O symmetry, are positive lenss and are made by plastic material.The refractive index n of the 3rd lens 3 used plastic materials D3And chromatic dispersion v D3Formula: 1.5＜n need meet the following conditions respectively D3＜1.63,50＜v D3＜66.The 3rd lens 3 used plastics are preferable over Z480R, and its refractive index and chromatic dispersion are respectively: n D3=1.5247, v D3=56.26.
Eyeglass 4 is a sheet glass, is used for protecting the image sensor surface 61 of image sensing component 6.Eyeglass 4 is that a glass material is made, the preferred B270 of its used glass material, and its refractive index and chromatic dispersion are respectively: n D4=1.52308, v D4=58.57.
The related parameter values of each lens of the optical system of digital camera lens of the present invention is presented in the table 1, and wherein radius-of-curvature ri is the radius-of-curvature of the crossing curved surface of this aspheric surface and optical axis O, and spacing di is by object space Z along optical axis direction 1Begin the distance between each aspheric surface, effective aperture is the effective clear aperture of each aspheric maximum, and wherein all numerical value of radius-of-curvature ri and spacing di are measurement unit with millimeter (mm) all.
Table 1
The surface Radius-of-curvature (ri) Spacing (di) Refractive index (n di) Chromatic dispersion (v di) Effective aperture
???12 ??????2.311968 ?????1.013097 ?????1.58313 ?????59.4 ?????2.308999
???14 ??????-6.80436 ?????0.5135666 ?????2.46545
???22 ??????-1.420537 ?????0.7909777 ?????1.58547 ?????29.9 ?????2.447331
???24 ??????-3.092721 ?????0.7797798 ?????2.636888
???32 ??????3.548864 ?????1.436103 ?????1.5247 ?????56.26 ?????3.957776
???34 ??????3.82533 ?????0.6 ?????4.785195
???42 ??????∞ ?????0.4 ?????1.52308 ?????58.57 ?????5.051316
???44 ??????∞ ?????0.511411 ?????5.153656
First lens 1, second lens 2 and the 3rd lens 3 of digital camera lens of the present invention are along the non-spherical lens of optical axis O symmetry, and wherein the design of each aspheric surface 12,14,22,24,32,34 all need be satisfied following aspheric surface formula:
z＝c vr 2/{1+〔1-(1+k)c v 2r 2〕 1/2}+a 4r 4+a 6r 6+a 8r 8+a 10r 10
(1)
Wherein: z is for axially being worth along the z of optical axis O direction, i.e. minute surface depth value, and each aspheric surface the 12,14,22,24,32, the 34th wherein, the curved surface by above formula gained rotates around optical axis direction and forms; K is the quadric surface coefficient; c v=1/R, wherein R is a minute surface curvature of centre radius, c vBe the minute surface curvature of centre; R is the minute surface centre-height; a 4, a 6, a 8, a 10Be the high-order asphericity coefficient.When using this aspheric surface formula (1), wherein quadric surface coefficient k and high-order asphericity coefficient a 4, a 6, a 8, a 10Numerical value with reference to table 2.
Table 2
The surface Asphericity coefficient
???k ??????????????a 4 ?????????????a 6 ??????????????a 8 ????????????a 10
???12 ???0 ???????-1.4345078×10 -2 ????????2.102038×10 -3 ???????-1.4322654×10 -2 ???????4.7112011×10 -3
???14 ???0 ???????-3.8019498×10 -2 ????????6.368405×10 -3 ???????-1.9053283×10 -2 ???????8.7228406×10 -3
???22 ???0 ???????9.25578×10 -2 ????????5.905983×10 -2 ???????-4.9966736×10 -2 ???????2.3094611×10 -2
???24 ???0 ???????6.3158171×10 -2 ????????3.0872605×10 -2 ???????-8.1318192×10 -3 ???????1.4402108×10 -3
????32 ???0 ????????-3.0503484×10 -2 ???????1.6964913×10 -3 ???0 ???0
????34 ???0 ????????-2.7470475×10 -2 ???????-9.1405728×10 -5 ???0 ???0
The specifications parameter value of digital camera lens of the present invention is presented at as in the following table 3, its effective focal length f, the light-inletting quantity F of system No, maximum field of view angle 2 ω of whole optical system, field angle 2 ω of horizontal direction H, field angle 2 ω of vertical direction V, largest image sensing face diameter CA, its numerical value is measurement unit with millimeter (mm).The optical system length overall of digital camera lens of the present invention is 6.307mm, i.e. length overall from the first surface 12 of first lens 1 to image sensor surface 61.
Table 3
????f ?????4.815
????F no ?????2.8
????2ω ?????57.56
????2ω H ?????45.82
????2ω V ?????35.15
????CA ?????4.85
Please refer to Fig. 3 A, Fig. 3 A and Fig. 4, therefrom can find out digital camera lens of the present invention, its optical distortion is less than 0.39%, meridianal curvature of field is less than 0.008mm, its sagitta of arc curvature of field is less than 0.06mm, its image frame distortion is less than 0.66%, and its relative exposure is minimum to be 58%, so naked eyes are difficult for finding out difference.
The specification that influences sensing component 6 of the optimum matching of digital camera lens of the present invention is as follows: its valid pixel: 1280 pixels * 960 pixels; Pixel Dimensions: 3.18 μ m * 3.18 μ m; Effective photosensitive area: 4.07mm * 3.05mm.
Be appreciated that digital camera lens of the present invention 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, personal digital assistant PDA (Personal Digital Assistant) etc.

Claims (10)

1. digital camera lens, comprise successively from the object side to the image side: one first lens, one second lens and one the 3rd lens is characterized in that:
These first lens are biconvex double-sized non-spherical eyeglasses, comprise first aspheric surface and second aspheric surface, and wherein the first aspheric radius-of-curvature is that 2.311968, the second aspheric radius-of-curvature are-6.80436, and it is made by glass material;
These second lens comprise that one is recessed to first aspheric surface of object space and second aspheric surface of undulate shape, and wherein the first aspheric radius-of-curvature is that-1.420537, the second aspheric radius-of-curvature is-3.092721, and it is made by plastic material;
The 3rd lens comprise first aspheric surface and second aspheric surface, and wherein the first aspheric radius-of-curvature is that 3.548864, the second aspheric radius-of-curvature are 3.82533, and it is made by plastic material.
2. digital camera lens as claimed in claim 1 is characterized in that: the equal undulate shape of two aspheric surfaces of the 3rd lens, and with respect to symmetrical.
3. digital camera lens as claimed in claim 1 is characterized in that: this digital camera lens further comprises a diaphragm, before it places first lens.
4. digital camera lens as claimed in claim 1 is characterized in that: the refractive index of these first lens is greater than 1.5 less than 1.62, its chromatic dispersion greater than 56 less than 66.
5. digital camera lens as claimed in claim 4, wherein this glass material is L-BAL42.
6. digital camera lens as claimed in claim 1 is characterized in that: the refractive index of these second lens is greater than 1.55 less than 1.65, its chromatic dispersion greater than 25 less than 36.
7. digital camera lens as claimed in claim 6, wherein this plastic material is a polycarbonate.
8. digital camera lens as claimed in claim 1 is characterized in that: the refractive index of the 3rd lens is greater than 1.5 less than 1.63, its chromatic dispersion greater than 50 less than 66.
9. digital camera lens as claimed in claim 8, wherein this plastic material is Z480R.
10. digital camera lens as claimed in claim 1, wherein at least one coating surface of these first lens has one deck IR-cut filter membrane (IR-cut Coating).
CNB2004100267042A 2004-03-27 2004-03-27 Digital camera lens Expired - Fee Related CN100376915C (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101334513B (en) * 2007-06-25 2010-06-23 比亚迪股份有限公司 Optical lens component
CN101344630B (en) * 2007-07-12 2010-08-25 比亚迪股份有限公司 Optical lens with short overall length
CN102346290A (en) * 2010-07-29 2012-02-08 比亚迪股份有限公司 Optical lens assembly
CN101533148B (en) * 2008-12-26 2012-05-09 凤凰光学(上海)有限公司 Optical imaging system of high-pixel mobile phone lens
CN103513405A (en) * 2012-06-26 2014-01-15 大立光电股份有限公司 Single focus optical image capturing system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3564107B2 (en) * 2002-03-05 2004-09-08 コニカミノルタホールディングス株式会社 Compact shooting lens
ATE315794T1 (en) * 2002-03-25 2006-02-15 Konishiroku Photo Ind THREE LENS LENS
TWI261120B (en) * 2002-07-18 2006-09-01 Konica Corp Image pickup lens, image pickup unit and portable terminal

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101334513B (en) * 2007-06-25 2010-06-23 比亚迪股份有限公司 Optical lens component
CN101344630B (en) * 2007-07-12 2010-08-25 比亚迪股份有限公司 Optical lens with short overall length
CN101533148B (en) * 2008-12-26 2012-05-09 凤凰光学(上海)有限公司 Optical imaging system of high-pixel mobile phone lens
CN102346290A (en) * 2010-07-29 2012-02-08 比亚迪股份有限公司 Optical lens assembly
CN102346290B (en) * 2010-07-29 2013-12-04 比亚迪股份有限公司 Optical lens assembly
CN103513405A (en) * 2012-06-26 2014-01-15 大立光电股份有限公司 Single focus optical image capturing system
CN103513405B (en) * 2012-06-26 2016-01-13 大立光电股份有限公司 Single focus optical image capturing system

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Effective date of registration: 20201130

Address after: 226500 Group 15 of Dengyuan Community of Rucheng Town, Rugao City, Nantong City, Jiangsu Province (in No. 4 Standard Workshop of Rugao Economic and Trade Development Corporation)

Patentee after: NANTONG TIANMU INSULATING COMPOSITE MATERIALS Co.,Ltd.

Address before: 518109, No. two, No. tenth, East Ring Road, Pinus tabulaeformis Industrial Zone, Longhua Town, Baoan District, Guangdong, Shenzhen, 2

Patentee before: Hongfujin Precision Industry (Shenzhen) Co.,Ltd.

Patentee before: HON HAI PRECISION INDUSTRY Co.,Ltd.

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