CN102103249A - Image pickup lens, camera module and portable information device - Google Patents
Image pickup lens, camera module and portable information device Download PDFInfo
- Publication number
- CN102103249A CN102103249A CN 201010559243 CN201010559243A CN102103249A CN 102103249 A CN102103249 A CN 102103249A CN 201010559243 CN201010559243 CN 201010559243 CN 201010559243 A CN201010559243 A CN 201010559243A CN 102103249 A CN102103249 A CN 102103249A
- Authority
- CN
- China
- Prior art keywords
- lens
- pick
- mentioned
- camera module
- electro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The present invention provides an image pickup lens which is suitable for an image pickup module with a solid image pickup component, can be manufactured with a reduced manufacturing cost and can easily keep an anticipated resolution. The image pickup lens (1) is provided with the following components: a lens (2) which is provided with a convex surface (6) at the side of a photographed object (4), and a lens (3) which is configured at a side of an image surface (5) of the lens (2). The lens (3) is provided with a surface (7) which faces the side of the photographed object (4). The surface (7) is provided with a convex central part (8) and a concave peripheral part (9) which is formed at the periphery of the central part (8). When d1 is set to a central thickness of the lens (2); d12 is a distance between the lens (2) and the lens (3); and d is a total length of an optical system, the following relational expressions are satisfied: 0.35<(d1/d)<0.5 and 0.07<(d12/d)<0.3.
Description
Technical field
The present invention relates to pick-up lens, camera module and portable information device, above-mentioned pick-up lens, camera module and portable information device tool be formed with the 1st lens of convex surface at object side, and the 2nd lens that are configured in the image planes side of above-mentioned the 1st lens.
Background technology
In recent years, about the photographing module that loads in digital camera and the digital video unit etc., developed the multiple photographing module that uses as imaging apparatus with solid-state imager in succession.Charge-coupled image sensor) and CMOS (Complementary Metal Oxide Semiconductor: formation such as complementary metal oxide semiconductor) at this, for instance, solid-state imager can be by CCD (Charge Coupled Device:.By using solid-state imager, can realize the miniaturization and the slimming (Low Profile) of photographing module.
In recent years, be that the portable terminal of typical case has obtained popularizing rapidly particularly with portable data assistance and portable phone.For the photographing module that is loaded on this portable terminal, expect that it has high-resolution small-sized, slim pick-up lens.
In patent documentation 1, disclose an example and had high-resolution small-sized, slim pick-up lens (that is so-called telescopic pick-up lens).This pick-up lens has the 1st lens of positive refraction by use and has the 2nd of negative refraction and constitute thoroughly.
For disclosed pick-up lens in patent documentation 1, shorter because its total length is compared the focal length of whole pick-up lens, so can realize miniaturization and slimming.And various aberrations such as disclosed pick-up lens to be that acting in conjunction by the 1st and the 2nd lens comes poor to intelligent image, astigmatism and filed curvature etc. carry out revisal in the patent documentation 1, so can improve resolution.Therefore, by disclosed technology in patent documentation 1, can realize having the small-sized image pickup camera lens of good optical characteristic.
In patent documentation 2, disclose another example and had high-resolution small-sized, slim pick-up lens.This pick-up lens has positive refraction by use the 1st lens constitute with these the two pieces of lens of the 2nd lens with negative refraction.
Other examples about high-resolution small-sized, slim pick-up lens, for example have, have the 1st lens of positive refraction and have the pick-up lens (with reference to patent documentation 4～7 and patent documentation 9～11) that these two pieces of lens of the 2nd lens of negative refraction constitute by use.
In addition, a kind of camera wide-angle lens that can keep high resolving power and can simply be made is disclosed in patent documentation 3.
Disclosed camera lens has refrangible the 1st lens of plus or minus by use and has these two pieces of camera lenses of positive refraction the 2nd lens and constitute in the patent documentation 3.And, in patent documentation 3 disclosed camera lenses, improve the influence of spherical aberration and filed curvature by making the imaging film bending that constitutes image planes.
In the patent documentation 1～11 disclosed various technology be by make the 1st and the 2nd lens separately object side and each face of image planes side form the shape that includes concave surface and/or convex surface, realize small-sized, slim pick-up lens.
Patent documentation 1: the open communique of Japan's patented claim, " spy opens the 2008-309999 communique "; On Dec 25th, 2008 is open.
Patent documentation 2: the open communique of Japan's patented claim, " spy opens the 2004-145183 communique "; On May 20th, 2004 is open.
Patent documentation 3: the open communique of Japan's patented claim, " spy opens flat 8-334684 communique "; On Dec 17th, 1996 is open.
Patent documentation 4: the open communique of Japan's patented claim, " spy opens the 2002-296496 communique "; On October 9th, 2002 is open.
Patent documentation 5: Japan's license bulletin, " speciallyying permit communique No. 3717482 "; On September 2nd, 2004 was announced.
Patent documentation 6: Japan's license bulletin, " speciallyying permit communique No. 4074203 "; On September 2nd, 2004 was announced.
Patent documentation 7: Japan's license bulletin, " speciallyying permit communique No. 3717483 "; On September 9th, 2004 was announced.
Patent documentation 8: Japan's license bulletin, " speciallyying permit communique No. 3717487 "; On January 8th, 2004 was announced.
Patent documentation 9: the open communique of Japan's patented claim, " spy opens the 2005-107254 communique "; On April 21st, 2005 is open.
Patent documentation 10: the open communique of Japan's patented claim, " spy opens the 2005-107368 communique "; On April 21st, 2005 is open.
Patent documentation 11: the open communique of Japan's patented claim, " spy opens the 2005-107369 communique "; On April 21st, 2005 is open.
Along with the pick-up lens with a plurality of lens is carried out miniaturization and slimming, make the comparatively difficulty that also becomes.That is to say, in the optical system of miniaturization and slimming, the uneven thickness and the off-centre of each lens of constituting this optical system, strict control manufacturing tolerance (tolerance).At this, " off-centre " is meant, the optical axis dislocation that each lens of formation optical system are produced between two face or the dislocation of the relative the opposing party's lens of side's lens wait the various dislocation that displacement produced of these system optical axis on its normal direction.
For the pick-up lens with miniaturization and slimming is applied to use the photographing module of solid-state imager, uneven thickness and off-centre that requirement will constitute each lens of this pick-up lens wait these error control in the scope of about 1.5 μ m～2 μ m.Owing to need satisfy this strict requirement, therefore make comparatively difficulty.The manufacturing difficulty that becomes will cause producing following problems: with regard to pick-up lens, satisfy institute's requirement, required manufacturing cost will increase; Because bigger manufacturing inequality easily takes place, so the resolution of the expectation that is hard to keep.
In general, pick-up lens is miniaturization and slimming, and (Modulation Transfer Function: variation modulation transfer function) is just big more with the amount of above-mentioned off-centre for MTF.Therefore, pick-up lens is miniaturization and slimming, just requires to produce the camera lens that offset more approaches 0 μ m, so manufacture difficulty is just big more.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of photographing module that can be applied to having solid-state imager, and can cut down manufacturing cost and easy pick-up lens, camera module and the portable information device that keeps expectation resolution.
Pick-up lens of the present invention possesses at object side and is formed with the 1st lens of convex surface and at the 2nd lens of the image planes side of above-mentioned the 1st lens configuration, above-mentioned the 2nd lens have the face towards above-mentioned object side, and above-mentioned mask has the central portion of convex and the periphery of the spill that forms around the above-mentioned central portion.This pick-up lens is characterised in that: when establishing the center thickness that d1 is above-mentioned the 1st lens, if d12 is the interval between above-mentioned the 1st lens and above-mentioned the 2nd lens, when if d is the optical system length overall, satisfy relational expression 0.35＜(d1/d)＜0.5 and 0.07＜(d12/d)＜0.3.
According to above-mentioned feature, the 2nd lens among the face of object side, middle body protrudes to object side, simultaneously, its peripheral part caves in to the image planes side.According to this structure, from near pass through the middle body of the 2nd lens light to the direction of image planes side (in general from object side, be optical axis direction along pick-up lens) on, can carry out imaging in the place of more close object side, simultaneously, on this same direction, can carry out imaging near pass through the peripheral part of the 2nd lens light in the place of more close image planes side.Therefore, pick-up lens of the present invention can corresponding the 2nd lens in towards the degree of convexity of object side with towards the sinking degree of image planes side, various aberrations such as filed curvature are proofreaied and correct.And according to said structure, the 2nd lens can similarly use as the lens of positive refraction or negative refraction with the 1st lens.Thus, can reduce asymmetry between the 1st lens and the 2nd lens.So when taking place off-centre and the 1st and the 2nd lens uneven thickness separately with equal error, pick-up lens of the present invention can reduce the harmful effect that this error causes, so can substantially enlarge the permissible range of this error.
And this pick-up lens is by satisfying above-mentioned relation formula 0.35＜(d1/d), can relax in the 1st lens towards object side with towards the change of shape of each face of image planes side.That is to say that above-mentioned each face can reduced from the protrusion degree and the sinking degree of object side on the direction of image planes side.Can also enlarge to each other the interval of above-mentioned each face on this same direction.
Be mutual disperse state by the corresponding light beam that satisfies above-mentioned relation formula 0.07＜(d12/d), make each image height (Image Height) of injecting the 2nd lens, thereby can easily distort, the correction of astigmatism in the place of more close image planes side.
In sum, when separately thickness deviation equal error of eccentric and the 1st and the 2nd lens takes place when, the pick-up lens of the present invention that satisfies the above-mentioned relation formula can reduce the harmful effect that this error causes, and can reduce the dysgenic permissible range of this error so can substantially enlarge.
Hence one can see that, pick-up lens of the present invention is when being subjected to miniaturization and slimming, owing to no longer need eccentric and the 1st and the 2nd lens uneven thickness separately etc. are strict with, just become comparatively simple so satisfy the manufacturing of desired pick-up lens.Therefore, this pick-up lens can be reduced to and meet the demands and the cost of wanting when making, and since be difficult for causing making uneven, so can easily keep the resolution expected.
When the value of d1/d 0.35 when following, because the thickness attenuation of the 1st lens will obtain bigger refracting power, just need to increase in the 1st lens change of shape towards the face of object side, that is to say, need to increase the protrusion degree of convex surface, and this is not good scheme.Therefore, in order to obtain the effect of this pick-up lens, need make the value of d1/d satisfy above-mentioned relation formula 0.35＜(d1/d).
When the value of d12/d 0.07 when following because the 1st lens narrow down with interval between the 2nd lens, the aberration correction quantity of the 1st lens and the 2nd lens can mix, thereby causes the good aberration correction of very difficult realization.Perhaps, even realized good optical aberration correcting, the result still will require very strict value to the axle dislocation deviation between the lens, thereby causes the difficulty in the manufacturing.
When the value of d1/d 0.5 when above, then be difficult to lateral aberration is carried out revisal, perhaps cause tolerance responsive more.Specifically, the light beam that passes through from the face of the object side of the 1st lens is spot condition, so the calibration result to lateral aberration on this face can weaken, causes fully carrying out aberration correction.At this moment, if weaken the refractivity of the 1st lens, the light beam that passes through from the face of the object side of the 1st lens just is not spot condition, thereby can on this face, proofread and correct lateral aberration, yet in order to ensure effective picture circle (effectively imaging region), need utilize this face to make the rapid deviation of light, the result will cause the tolerance to off-centre etc. responsive more.
When the value of d12/d 0.3 when above, then be difficult to filed curvature and astigmatism are proofreaied and correct.That is to say,, be difficult to fully carry out aberration correction because the object plane of the 2nd lens and the interval between the image planes are short too many with respect to total length.
Camera module of the present invention is characterised in that: have pick-up lens of the present invention and in order to the electro-photographic element of the expression light that receives the formed picture of above-mentioned pick-up lens.
By said structure, can realize low price, small-sized, high performance digital camera.
It is characterized in that of portable information device of the present invention: have pick-up lens of the present invention, in order to the electro-photographic element of the expression light that receives the formed picture of above-mentioned pick-up lens, and the captured image of above-mentioned electro-photographic element carried out memory storing.
By said structure, can realize low price, small-sized, high performance portable information device.
(invention effect)
1 when establishing the center thickness that d1 is above-mentioned the 1st lens, if d12 is the interval between above-mentioned the 1st lens and above-mentioned the 2nd lens, when if d is the optical system length overall, owing to satisfy relational expression 0.35＜(d1/d)＜0.5 and 0.07＜(d12/d)＜0.3, so can be applied to possess the photographing module of solid-state imager, and a kind of pick-up lens, camera module and the portable information device that can cut down manufacturing cost and keep expectation resolution can be provided.
Description of drawings
Fig. 1 is the pie graph of the pick-up lens of expression embodiment 1.
Fig. 2 is the figure of data such as the aspheric surface formula that records each lens in the above-mentioned pick-up lens, material, shape.
Fig. 3 is the figure that records the specification and the various optical characteristics of above-mentioned pick-up lens.
Fig. 4 is the coordinate figure of the MTF/ spatial frequency characteristic of the above-mentioned pick-up lens of expression.
Fig. 5 is the coordinate figure of the MTF/ out of focus characteristic of the above-mentioned pick-up lens of expression.
Fig. 6 is the astigmatism of the above-mentioned pick-up lens of expression and the coordinate figure of distortion.
Fig. 7 is the coordinate figure of the spherical aberration of the above-mentioned pick-up lens of expression.
Fig. 8 be expression with above-mentioned pick-up lens in the misplace coordinate diagram of corresponding MTF variation of optical axis between the minute surface of the 1st lens that are provided with.
Fig. 9 be expression with above-mentioned pick-up lens in the misplace coordinate diagram of corresponding MTF variation of the 1st lens that are provided with and the optical axis between the 2nd lens.
Figure 10 is the sectional view that the lead-in wire bonding type structure of the no focusing structure camera module that above-mentioned pick-up lens is arranged is used in expression.
(a)～(d) is the sectional view of the wafer scale lens operation when making the above-mentioned no focusing structure camera module of lead-in wire bonding type in order to explanation among Figure 11.
Figure 12 is the sectional view of the structure of expression wafer upper glass above-mentioned no focusing structure camera module that type is set.
Among Figure 13 (a) and (b) be the sectional view of the wafer scale lens operation when making the wafer upper glass the above-mentioned no focusing structure camera module of type is set in order to explanation.
(a)～(c) is the sectional view of the existing injection moulding operation when making the no focusing structure camera module of lead-in wire bonding type in order to explanation among Figure 14.
Figure 15 is the figure of data such as the aspheric surface formula that records each lens in the pick-up lens of embodiment 2, material, shape.
Figure 16 is the figure that records the specification and the various optical characteristics of above-mentioned pick-up lens.
Figure 17 is the mode chart of the layout in the above-mentioned pick-up lens of expression.
Figure 18 is the coordinate figure of the MTF/ spatial frequency characteristic of the above-mentioned pick-up lens of expression.
Figure 19 is the coordinate figure of the MTF/ out of focus characteristic of the above-mentioned pick-up lens of expression.
Figure 20 is the figure of data such as the aspheric surface formula that records each lens in the pick-up lens of embodiment 3, material, shape.
Figure 21 is the figure that records the specification and the various optical characteristics of each lens in the above-mentioned pick-up lens.
Figure 22 is the mode chart of the layout in the above-mentioned pick-up lens of expression.
Figure 23 is the coordinate figure of the MTF/ spatial frequency characteristic of the above-mentioned pick-up lens of expression.
Figure 24 is the coordinate figure of the MTF/ out of focus characteristic of the above-mentioned pick-up lens of expression.
(label declaration)
1 pick-up lens
2 lens (the 1st lens)
3 lens (the 2nd lens)
4 subjects
5 image planes
6 convex surfaces
7
8 central portions
9 peripheries
10 aperture diaphragms
11 cover glasses
12 electro-photographic elements
13 substrates
14 housings
The d1 center thickness
D12 at interval
D optical system length overall
2k matrix-like mould
2a, 3a lens arra
10a aperture diaphragm array
11a cover glass array
12a electro-photographic element arrays
The 13a base plate array
The 92k mould
Embodiment
According to Fig. 1～Figure 24, the embodiment of pick-up lens of the present invention is done following explanation.
(embodiment 1)
(structure of the pick-up lens 1 of embodiment 1)
Fig. 1 is the structural drawing of the pick-up lens 1 of expression embodiment 1.Pick-up lens 1 has lens 2.In lens 2, be formed with convex surface 6 in subject 4 sides, and be formed with concave surface, and have center thickness d1 in image planes 5 sides.In subject 4 sides of lens 2, be provided with aperture diaphragm (Aperture Stop) 10.
Between lens 3 and image planes 5, be provided with cover glass 11.In image planes 5 sides of cover glass 11, the configuration of joining of electro-photographic element 12 and image planes 5.
If establishing the optical system length overall of pick-up lens 1 is d, then pick-up lens 1 satisfies the relation shown in formula (1) and the formula (2).
0.35＜(d1/d)＜0.5 formula (1)
0.07＜(d12/d)＜0.3 formula (2)
Pick-up lens 1 is above-mentioned 0.35＜(d1/d) by satisfying, and can relax the change of shape towards the convex surface 6 of subject 4 sides of lens 2, and relaxes the change of shape towards the concave surface of image planes 5 sides.That is to say, can reduce those faces at protrusion degree and sinking degree on the direction of subject 4 side direction image planes 5 sides.And, can also enlarge each face interval to each other on this same direction.
By satisfying above-mentioned 0.07＜(d12/d) relation, can make the corresponding light beam of each image height of injecting lens 3 be mutual disperse state, thereby can easily distort, the correction of astigmatism in the place of more close image planes 5 sides.
When the value of d1/d 0.35 when following, because the thickness attenuation of lens 2 will obtain bigger refractivity, just need to increase in the lens 2 change of shape towards the convex surface 6 of subject 4 sides, that is to say, need to increase the protrusion degree of convex surface 6, but this is not good scheme.Therefore, in order to obtain the effect of pick-up lens 1, need make the value of d1/d satisfy above-mentioned 0.35＜(d1/d) relation.
When the value of d12/d 0.07 when following because lens 2 narrow down with interval between the lens 3, lens 2 can mix with the aberration correction quantity of lens 3, thereby cause being difficult to the good aberration correction of realization.Perhaps, even realized good optical aberration correcting, the result still will require very strict value to the axle dislocation deviation between lens 2 and the lens 3, thereby produces the problem of making difficulty.
When the value of d1/d 0.5 when above, then be difficult to lateral aberration is proofreaied and correct, perhaps cause tolerance responsive more.Specifically, the light beam that passes through from the object plane of lens 2 is spot condition, so the calibration result to lateral aberration on this face can weaken, causes fully carrying out aberration correction.At this moment, if weaken the refractivity of lens 2, the light beam that passes through from the object plane of lens 2 just is not spot condition, thereby can on this face, proofread and correct lateral aberration, yet in order to ensure effectively picture is round, need utilize this face to make the rapid deviation of light, the result will cause the tolerance to off-centre etc. responsive more.
When the value of d12/d 0.3 when above, then be difficult to filed curvature and astigmatism are proofreaied and correct.That is to say,, be difficult to fully carry out aberration correction because the object plane of lens 3 and the interval between the image planes are short too many with respect to total length.
The Abbe number of the material of preferred lens 2 and lens 3 is greater than 40.The range of choice of material is as if wider, and the cheap material of use, just can cut down manufacturing cost, and can use the various manufacturing processes that are not subjected to materials limitations.For example, the material of lens 2 and lens 3 can be made of thermoplastic plastic, can use the E48R that Japanese ZEON company produces (Nd is 1.531, vd be 56), 330R (Nd is 1.509, vd be 56) or 480R (Nd is 1.525, vd be 56).Scattering lower (Abbe number is higher) though material be useful for pick-up lens, research and development comparatively the difficulty.Shown in above-mentioned example, about used thermoplasticity material in injection moulding (Injection Molding) method, developed Abbe number and be about 56 material.In embodiments of the present invention, use with enumerating that Abbe number is arranged is the design example of 46 material.
The F number of preferred pick-up lens is less than 3.By the F number is narrowed down to less than 3, can increase the light income of pick-up lens 1, and the chromatogram aberration can obtain good correction, therefore can access higher resolution.The F number is a kind of amount of representing the brightness of optical system.What the F numerical table of pick-up lens 1 showed is the value of the equivalent focal distance of pick-up lens 1 divided by the entrance pupil diameter of pick-up lens 1.
Preferred electron imaging apparatus 12 is made of the CMOS imaging apparatus or the CCD imaging apparatus of pixel size below 2.5 μ m.Constitute according to this,, can realize a kind of photographing module of giving full play to the performance of high-resolution imaging apparatus by constituting sensor with the solid-state imager of pel spacing below 2.5 μ m.
The CMOS imaging apparatus of preferred formation electro-photographic element 12 or the pixel count of CCD imaging apparatus are more than 300,000.Be applicable to the sensor of the resolution performance of pick-up lens, the digital-code camera module that can obtain having the good discrimination performance by setting.This preferred structure is specially adapted to the sensor of VGA level.
Interval between preferred electron imaging apparatus 12 and the cover glass 11 is more than 0.195mm.
Said structure can be applicable to: using has the mobile communications device of solid-state imager with lens on lead-in wire bonding structure that is widely used in the digital-code camera module and the wafer this two side of structure to be set.When the interval between cover glass 11 and the electro-photographic element 12 during less than 0.195mm, can and the lead-in wire generation mutual interference mutually that between sensor and substrate, is electrically connected, so can't be applicable to the modular structure of lead-in wire bonding mode.
(design specification of the pick-up lens of embodiment 1 and optical characteristics)
Fig. 2 is the figure of data such as the aspheric surface formula that records each lens that constitutes pick-up lens 1, material, shape.What " L1 " among Fig. 2 in " key element " hurdle represented is the lens 2 of Fig. 1, and what " L2 " represented is lens 3." CG " represents cover glass.
" Nd " shown in " material " hurdle is meant the refractive index of the relative d line of various materials (wavelength is 587.6nm) that constitutes each lens among Fig. 2, and " vd " is the Abbe number of the relative d line of various materials." center thickness " be meant from obverse center, to the image planes side, and distance on the optical axis till the center of next face." effective radius " is the radius in circle zone that can the control bundle scope on the lens." asphericity coefficient " is meant, represents aspheric aspheric surface formula, is the coefficient Ai (i is the even number more than 4) in the aspheric surface formula shown in Figure 2.
The value of (dl/d) of the pick-up lens 1 that is constituted according to the aspheric surface formula of each lens shown in Figure 2, material, shape etc. is 0.39, and value (d12/d) is 0.14.
Fig. 3 is the figure that records the specification and the various optical characteristics of pick-up lens 1.MTF (Modulation Transfer Function: modulation transfer function) calculate with the corresponding flexible strategy of wavelength by following.That is,
404.66nm corresponding 0.13;
435.84nm corresponding 0.49;
486.1327nm corresponding 1.57;
546.07nm corresponding 3.12;
587.5618nm corresponding 3.18;
656.2725nm corresponding 1.51.
In addition, the object distance that is adopted is 500mm.
(effect of the pick-up lens of embodiment 1)
Fig. 4 is the coordinate figure of the MTF/ spatial frequency characteristic of expression pick-up lens 1.Transverse axis representation space frequency, the longitudinal axis is represented MTF.The pick-up lens 1 space frequency of embodiment 1 has very high MTF characteristic.
Fig. 5 is the coordinate figure of the MTF/ out of focus characteristic of expression pick-up lens 1.Transverse axis is represented focus deviation, and the longitudinal axis is represented MTF.By the pick-up lens 1 of embodiment 1, can obtain to realize the out of focus characteristic of best image planes position.
Fig. 6 is the astigmatism of expression pick-up lens 1 and the coordinate figure of distortion.The left side coordinate figure of Fig. 6 is the coordinate diagram of expression astigmatism, and the coordinate diagram on right side is the coordinate diagram of expression distortion.Transverse axis is represented the displacement of image planes 5, and each longitudinal axis is represented the size of astigmatism and distortion respectively.As shown in Figure 6, by the pick-up lens 1 of present embodiment, can carry out good correction to astigmatism and distortion.
Fig. 7 is the coordinate figure of the spherical aberration of expression pick-up lens 1.Transverse axis is represented the displacement of image planes 5, and the longitudinal axis is represented the size of spherical aberration.As shown in Figure 7, by the pick-up lens 1 of present embodiment, can carry out good correction to spherical aberration.
Fig. 8 be expression with pick-up lens in the misplace coordinate diagram of corresponding MTF variation of optical axis between the minute surface of 1 lens 2 that are provided with.Transverse axis is represented the margin of error (optical axis magnitude of misalignment), and the longitudinal axis is represented MTF.Solid line represents that the MTF of sagittal surface changes, and dotted line represents that the MTF of meridian ellipse changes.
Fig. 9 be expression with pick-up lens 1 in the misplace coordinate diagram of corresponding MTF variation of the optical axis of 3 on the lens 2 that are provided with and lens.Transverse axis is represented the margin of error (optical axis magnitude of misalignment), and the longitudinal axis is represented MTF.Identical with Fig. 8, solid line represents that the MTF of sagittal surface changes, and dotted line represents that the MTF of meridian ellipse changes.
(no focusing structure camera module) with pick-up lens of embodiment 1
Figure 10 is the sectional view of formation of the no focusing structure camera module 15 of expression lead-in wire bonding type, and using in this camera module 15 has pick-up lens 1.The camera module 15 of lead-in wire bonding type has pick-up lens 1.In pick-up lens 1, be provided with lens 2 and lens 3.Camera module 15 has substrate 13.On substrate 13, be provided with electro-photographic element 12.Electro-photographic element 12 is connected by the lead-in wire bonding with substrate 13.Between lens 3 and electro-photographic element 12, be provided with cover glass 11.Substrate 13 is provided with the housing 14 that has covered lens 2, lens 3, cover glass 11 and electro-photographic element 12.So the camera module 15 that constitutes is no lens barrel (lens barrel) structure.
(a)～(d) is the sectional view of the wafer scale lens operation when making the no focusing structure camera module 15 of lead-in wire bonding type in order to explanation among Figure 11.At first, shown in Figure 11 (a), by array-like mould 2k moulded lens array 2a.By other array-like mould moulded lens arrays 3a.Then, shown in Figure 11 (b), that lens arra 2a and lens arra 3a is bonding.Then, cut off lens arra 2a and lens arra 3a, shown in Figure 11 (c), be formed on the lens unit that is stained with lens 3 on the lens 2.Then, shown in Figure 11 (d), this lens unit and cover glass 11 are embedded housing (retainer) 14, and housing 14 is loaded on the substrate 13 that is provided with electro-photographic element 12, thereby finish camera module 15.
Figure 12 is the sectional view of the structure of expression wafer upper glass no focusing structure camera module 16 that type is set, and using in this camera module 16 has pick-up lens 1.The camera module 16 that the wafer upper glass is provided with type has pick-up lens 1.On pick-up lens 1, be provided with lens 2, lens 3 and aperture diaphragm 10.Camera module 16 has glass substrate 17.Form the electro-photographic element 12 of cover glass substrate 17.Between electro-photographic element 12 and lens 3, be provided with cover glass 11.So the camera module 16 that constitutes is no retainer (housing) structure.
Among Figure 13 (a) and (b) be the sectional view of the wafer scale lens operation when making the wafer upper glass the no focusing structure camera module 16 of type is set in order to explanation.At first, as reference Figure 11 (a) is illustrated, by array-like mould moulded lens array 2a and 3a.Then, as Figure 13
(a) shown in, lens arra 2a and 3a is bonding, on lens arra 2a, paste aperture diaphragm array 10a.Then, under lens arra 3a, paste cover glass array 11a.Sticking glass base plate array 17a and electro-photographic element arrays 12a under cover glass array 11a.Then, shown in Figure 13 (b), cut off aperture diaphragm array 10a, lens arra 2a and 3a, cover glass array 11a, electro-photographic element arrays 12a and glass substrate array 17a, thereby finish camera module 16.
(a)～(c) is the sectional view of the existing injection moulding operation when making the no focusing structure camera module of lead-in wire bonding type in order to explanation among Figure 14.At first, shown in Figure 14 (a),, shown in Figure 14 (b), from mould 92k, take out the molded lens of finishing 2, and cut out lens 2 then by mould 92k moulded lens 2.Make lens 3 with the method identical with lens 2.Then, shown in Figure 14 (c), lens 2 are bonded to lens 3 to form lens unit, this lens unit and cover glass 11 are embedded housing (retainer) 14, then housing 14 is loaded on the substrate 13 that is provided with electro-photographic element 12, thereby finishes camera module 15.
About Figure 11 and wafer scale lens operation shown in Figure 13, from manufacturing time and other comprehensive opinions of photographing module, it is more favourable than injection moulding operation shown in Figure 14.When carrying out wafer scale lens operation, the plastic yield that on lens arra 2a and 3a, produces that needs inhibition to cause by heat.Need at this, even preferably constitute lens 2 and lens 3 be heated extraordinary thermosetting resin material of also on-deformable thermotolerance or uv-hardening resin material.
(embodiment 2)
(design specification of the pick-up lens of embodiment 2 and optical characteristics)
Figure 15 is the figure of data such as the aspheric surface formula that records each lens in the pick-up lens of embodiment 2, material, shape.The basic structure of the pick-up lens of embodiment 2 is identical with pick-up lens shown in Figure 11.
Identical with the Fig. 2 described in the embodiment 1, what " L1 " on " key element " hurdle represented is lens 2 shown in Figure 1, and what " L2 " represented is lens 3." CG " represents cover glass." Nd " shown in " material " hurdle is meant the refractive index of the relative d line of various materials (wavelength is 587.6nm) that constitutes each lens, and " vd " is the Abbe number of the relative d line of various materials." center thickness " be meant from obverse center, to the image planes side, and distance on the optical axis till the center of next face." effective radius " is the radius in circle zone that can the control bundle scope on the lens." asphericity coefficient " is meant, represents aspheric aspheric surface formula, is the coefficient Ai (i is the even number more than 4) in the aspheric surface formula shown in Figure 2.
The value of (d1/d) of the pick-up lens 1 that is constituted according to the aspheric surface formula of each lens shown in Figure 15, material, shape etc. is 0.40, and value (d12/d) is 0.08.
Figure 16 records the specification of pick-up lens of embodiment 2 and the figure of various optical characteristics.Identical with the Fig. 3 described in the embodiment 1, MTF (modulation transfer function) calculates with the corresponding flexible strategy of wavelength by following.That is:
404.66nm corresponding 0.13;
435.84nm corresponding 0.49;
486.1327nm corresponding 1.57;
546.07nm corresponding 3.12;
587.5618nm corresponding 3.18;
656.2725nm corresponding 1.51.
In addition, the object distance that is adopted is 500mm.
Figure 17 is the figure of the interior layout of the pick-up lens of expression embodiment 2, has represented the path via lens 2, lens 3 and cover glass 11 light of imaging on image planes 5.The pick-up lens of the embodiment 2 also pick-up lens with embodiment 1 shown in Figure 1 is identical, has at object side to be formed with the lens 2 of convex surface and at the lens 3 of the image planes 5 sides configuration of lens 2.Lens 3 have the face towards object side, the periphery that this mask has the central portion of convex and is formed on this central portion spill on every side.
(effect of the pick-up lens of embodiment 2)
Figure 18 is the coordinate figure of MTF/ spatial frequency characteristic of the pick-up lens of expression embodiment 2.Transverse axis representation space frequency, the longitudinal axis is represented MTF.The pick-up lens of embodiment 2 has very high MTF characteristic for spatial frequency.
Figure 19 is the coordinate figure of MTF/ out of focus characteristic of the pick-up lens of expression embodiment 2.Transverse axis is represented focus deviation, and the longitudinal axis is represented MTF.By the pick-up lens of embodiment 2, can obtain to realize the out of focus characteristic of best image planes position.
(embodiment 3)
(design specification of the pick-up lens of embodiment 3 and optical characteristics)
Figure 20 is the figure of data such as the aspheric surface formula that records each lens in the pick-up lens of embodiment 3, material, shape.The basic structure of the pick-up lens of embodiment 3 is identical with pick-up lens shown in Figure 11.
Identical with the Fig. 2 described in the embodiment 1, what " L1 " on " key element " hurdle represented is lens 2 shown in Figure 1, and what " L2 " represented is lens 3." CG " represents cover glass." Nd " shown in " material " hurdle is meant the refractive index of the relative d line of various materials (wavelength is 587.6nm) that constitutes each lens, and " vd " is the Abbe number of the relative d line of various materials." center thickness " be meant from obverse center, to the image planes side, and distance on the optical axis till the center of next face." effective radius " is the radius in circle zone that can the control bundle scope on the lens." asphericity coefficient " be meant the aspheric aspheric surface formula of representative promptly, the coefficient Ai (i is the even number more than 4) in the aspheric surface formula shown in Figure 2.
The value of (d1/d) of the pick-up lens 1 that is constituted according to the aspheric surface formula of each lens shown in Figure 20, material, shape etc. is 0.40, and value (d12/d) is 0.08.
Figure 21 records the specification of each lens in the pick-up lens of embodiment 3 and the figure of various optical characteristics.Identical with the Fig. 3 described in the embodiment 1, MTF (modulation transfer function) calculates with the corresponding flexible strategy of wavelength by following.That is,
404.66nm corresponding 0.13;
435.84nm corresponding 0.49;
486.1327nm corresponding 1.57;
546.07nm corresponding 3.12;
587.5618nm corresponding 3.18;
656.2725nm corresponding 1.51.
In addition, the object distance that is adopted is 500mm.
Figure 22 is the figure of the interior layout of the pick-up lens of expression embodiment 3.Figure 22 has represented the light path via lens 2, lens 3 and cover glass 11 imaging on image planes 5.The pick-up lens of the embodiment 3 also pick-up lens with embodiment 1 shown in Figure 1 is identical, has at object side to be formed with the lens 2 of convex surface and at the lens 3 of the image planes 5 sides configuration of lens 2.Lens 3 have the face towards object side, the periphery that this mask has the central portion of convex and is formed on this central portion spill on every side.
(effect of the pick-up lens of embodiment 3)
Figure 23 is the coordinate figure of MTF/ spatial frequency characteristic of the pick-up lens of expression embodiment 3.Transverse axis representation space frequency, the longitudinal axis is represented MTF.The pick-up lens of embodiment 3 has very high MTF characteristic for spatial frequency.
Figure 24 is the coordinate figure of MTF/ out of focus characteristic of the pick-up lens of expression embodiment 3.Transverse axis is represented focus deviation, and the longitudinal axis is represented MTF.By the pick-up lens of embodiment 3, can obtain to realize the out of focus characteristic of best image planes position.
By pick-up lens shown in Figure 11 with receive the electro-photographic element 12 of the expression light of pick-up lens 1 formed picture, and the storer (not having diagram) of the captured image of store electrons imaging apparatus 12, can constitute portable information device.
The pick-up lens of preferred present embodiment satisfies relational expression 0.12＜(d12/d).
According to said structure, can further relax the manufacturing tolerance of the off-centre between the 1st lens and the 2nd lens.
In the pick-up lens of present embodiment, the Abbe number of the material of preferred above-mentioned the 1st lens and above-mentioned the 2nd lens is greater than 40.
According to said structure, the range of choice of material can be enlarged, and can use cheap material, thereby can cut down manufacturing cost, and can use the various manufacturing processes that are not subjected to materials limitations.
The F number of the pick-up lens of preferred present embodiment is less than 3.
By the F number is narrowed down to less than 3, can increase the light income of pick-up lens of the present invention, and the chromatogram aberration can obtain good correction, therefore can access higher resolution.
The pick-up lens of preferred present embodiment is made by wafer scale lens operation.
By said structure, the pick-up lens of present embodiment has the very big permissible tolerance of scope, thus can use the wafer scale operation, thus can produce lens module at a low price.
In the pick-up lens of present embodiment, preferably the object side at above-mentioned the 1st lens is provided with aperture diaphragm.
By said structure, can adjust light quantity distinct picture is provided.
In the camera module of present embodiment, preferred above-mentioned electro-photographic element is that pixel size is following CMOS imaging apparatus or CCD imaging apparatuss of 2.5 μ m.
According to said structure,, can realize to give full play to the photographing module of the high-resolution performance of imaging apparatus by the sensor that uses the solid-state imager of pel spacing below 2.5 μ m to constitute.
In the camera module of present embodiment, the pixel count of preferred above-mentioned CMOS imaging apparatus or CCD imaging apparatus is more than 300,000.
In said structure, possessed the sensor of the resolution performance that is applicable to pick-up lens, so can access digital-code camera module with good discrimination performance.This structure is particularly suitable for the sensor of VGA level.
In the camera module of present embodiment, being spaced apart more than the 0.195mm between preferred above-mentioned electro-photographic element and the cover glass.
Said structure can be applicable to: using has the mobile communications device of solid-state imager with lens on lead-in wire bonding structure that is widely used in the digital-code camera module and the wafer this two side of structure to be set.When the interval between cover glass and the sensor during less than 0.195mm, can and the lead-in wire generation mutual interference mutually that between sensor and substrate, is electrically connected, so can't be applicable to the module manufacturing of lead-in wire bonding mode.。
The camera module of preferred present embodiment has no focusing structure.
According to said structure, the lens of present embodiment have good tolerance susceptibility, so need not to adjust the position of the photo detector of the corresponding best image planes position on the optical axis direction.Therefore, on assembling procedure, need not to focus just can provide the camera module with focusing structure, thereby can cut down manufacturing cost.
In the camera module of present embodiment, the 1st and the 2nd lens of preferred above-mentioned pick-up lens are made of heat proof material.
By said structure, can provide a kind of camera module of the low installation cost installed of can realizing refluxing.Because heat proof material helps making the scope of tolerance to increase,, and can be suitable for the bigger operation of loading so that the thermal history that refluxes brings the permissible range of variation of entirety of lens package state is bigger.
The camera module of preferred present embodiment has no lens barrel structure.
According to said structure, because lens barrel is not set, so can be by cutting down operation and cutting down component parts and realize cost degradation.
The camera module of preferred present embodiment has no retainer structure.
According to said structure, because housing is not set, so can be by cutting down operation and cutting down component parts and realize cost degradation.
The present invention is not limited in above-mentioned various embodiment, can carry out various changes according to the scope shown in the claim, suitably makes up the technological means of recording and narrating in the different embodiments and the embodiment that obtains also is contained within the technical scope of the present invention.
(industrial utilize possibility)
The present invention can be applicable to pick-up lens, camera module and portable information device, and above-mentioned pick-up lens, camera module and portable information device have possessed at object side and be formed with the 1st lens of convex surface and at the 2nd lens of the image planes side of above-mentioned the 1st lens configuration. Can be applicable to especially use the solid-state imager that loads in the mancarried device arranged be used for being loaded onto pick-up lens on the digital camera.
Claims (15)
1. pick-up lens, possess at object side and be formed with the 1st lens of convex surface and at the 2nd lens of the image planes side of above-mentioned the 1st lens configuration, above-mentioned the 2nd lens have the face towards above-mentioned object side, above-mentioned mask has the central portion of convex and the periphery of the spill that forms around the above-mentioned central portion
This pick-up lens is characterised in that:
When establishing the center thickness that d1 is above-mentioned the 1st lens, establish d12 and be the interval between above-mentioned the 1st lens and above-mentioned the 2nd lens, when establishing d and being the optical system length overall, satisfy relational expression 0.35＜(d1/d)＜0.5 and 0.07＜(d12/d)＜0.3.
2. pick-up lens according to claim 1 is characterized in that:
Satisfy relational expression 0.12＜(d12/d).
3. pick-up lens according to claim 1 is characterized in that:
The Abbe number of the material of above-mentioned the 1st lens and above-mentioned the 2nd lens is greater than 40.
4. pick-up lens according to claim 1 is characterized in that:
The F number of this pick-up lens is less than 3.
5. pick-up lens according to claim 1 is characterized in that:
This pick-up lens is made by wafer scale lens operation.
6. pick-up lens according to claim 1 is characterized in that:
Object side at above-mentioned the 1st lens is provided with aperture diaphragm.
7. camera module is characterized in that:
Has the described pick-up lens of claim 1 and in order to the electro-photographic element of the expression light that receives the formed picture of above-mentioned pick-up lens.
8. camera module according to claim 7 is characterized in that:
Above-mentioned electro-photographic element is that pixel size is following CMOS imaging apparatus or CCD imaging apparatuss of 2.5 μ m.
9. camera module according to claim 8 is characterized in that:
The pixel count of above-mentioned CMOS imaging apparatus or CCD imaging apparatus is more than 300,000.
10. camera module according to claim 7 is characterized in that:
Being spaced apart more than the 0.195mm between above-mentioned electro-photographic element and the cover glass.
11. camera module according to claim 7 is characterized in that:
Has no focusing structure.
12. camera module according to claim 7 is characterized in that:
The the 1st and the 2nd lens of above-mentioned pick-up lens are made of heat proof material.
13. camera module according to claim 7 is characterized in that:
Has no lens barrel structure.
14. camera module according to claim 7 is characterized in that:
Has no retainer structure.
15. a portable information device is characterized in that:
Have the described pick-up lens of claim 1,
In order to the electro-photographic element of the expression light that receives the formed picture of above-mentioned pick-up lens,
The image captured to above-mentioned electro-photographic element carries out memory storing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-291306 | 2009-12-22 | ||
| JP2009291306A JP4890607B2 (en) | 2009-12-22 | 2009-12-22 | Imaging lens, camera module, and portable information device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102103249A true CN102103249A (en) | 2011-06-22 |
| CN102103249B CN102103249B (en) | 2013-03-06 |
Family
ID=44156154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010559243 Active CN102103249B (en) | 2009-12-22 | 2010-11-22 | Image pickup lens, camera module and portable information device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4890607B2 (en) |
| CN (1) | CN102103249B (en) |
| TW (1) | TWI463166B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01245211A (en) * | 1988-03-28 | 1989-09-29 | Sony Corp | Fixed focus lens |
| CN201210195Y (en) * | 2008-06-12 | 2009-03-18 | 一品光学工业股份有限公司 | Wide-angle dual eyeglass optical image taking lens |
| US20090231734A1 (en) * | 2008-03-13 | 2009-09-17 | Samsung Techwin Co., Ltd. | Imaging optical system for cameras |
| CN101604066A (en) * | 2008-06-12 | 2009-12-16 | 一品光学工业股份有限公司 | Wide-angle double-lens optical taking lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8125720B2 (en) * | 2009-03-24 | 2012-02-28 | Omnivision Technologies, Inc. | Miniature image capture lens |
-
2009
- 2009-12-22 JP JP2009291306A patent/JP4890607B2/en active Active
-
2010
- 2010-10-27 TW TW099136814A patent/TWI463166B/en active
- 2010-11-22 CN CN 201010559243 patent/CN102103249B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01245211A (en) * | 1988-03-28 | 1989-09-29 | Sony Corp | Fixed focus lens |
| US20090231734A1 (en) * | 2008-03-13 | 2009-09-17 | Samsung Techwin Co., Ltd. | Imaging optical system for cameras |
| CN201210195Y (en) * | 2008-06-12 | 2009-03-18 | 一品光学工业股份有限公司 | Wide-angle dual eyeglass optical image taking lens |
| CN101604066A (en) * | 2008-06-12 | 2009-12-16 | 一品光学工业股份有限公司 | Wide-angle double-lens optical taking lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011133572A (en) | 2011-07-07 |
| TWI463166B (en) | 2014-12-01 |
| JP4890607B2 (en) | 2012-03-07 |
| CN102103249B (en) | 2013-03-06 |
| TW201142344A (en) | 2011-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100520476C (en) | Image pickup lens, image pickup apparatus and mobile terminal | |
| CN103064173B (en) | Imaging lens, imaging device and portable terminal | |
| US7821724B2 (en) | Photographing optical lens assembly | |
| US8000031B1 (en) | Imaging optical lens assembly | |
| CN1325957C (en) | Small camera lens, camera unit and portable terminal provided with them | |
| CN102472883B (en) | Pick-up lens | |
| CN1327260C (en) | Image trapping lens, image trapper, and image trapping unit | |
| CN103827722B (en) | Pick-up lens, camera head and portable terminal device and digital device | |
| CN101995644B (en) | Image sensing module, imaging lens and code reading method | |
| CN201255784Y (en) | Video taking lens, camera module and video taking apparatus | |
| CN102213820B (en) | Image sensing lens and image sensing module | |
| CN103869452A (en) | Imaging lens, imaging device and portable terminal | |
| JP5037639B2 (en) | Imaging module | |
| CN102713716A (en) | Image-capturing lens, image-capturing device, and portable terminal | |
| CN101726837B (en) | Lens unit and image capturing device | |
| CN103314322A (en) | Image-capturing lens, image-capturing device, and mobile terminal | |
| CN101819315A (en) | Image pickup lens, image pickup apparatus, and mobile terminal | |
| CN101957494B (en) | Image pickup lens, image pickup lens and the manufacturing method of the two | |
| CN101874217B (en) | Imaging lens, imaging device, and portable terminal | |
| CN111045188B (en) | Optical lens assembly, image capturing module and electronic device | |
| CN102033301B (en) | Image pickup lens, image pickup module, method for manufacturing image pickup lens, and method for manufacturing image pickup module | |
| CN203480119U (en) | Image pick-up lens for solid-state imaging element | |
| CN104105992A (en) | Image pickup lens | |
| US20150378133A1 (en) | Imaging Device, Lens Unit, And Method For Manufacturing Imaging Device | |
| CN101788707A (en) | Image pickup lens, image pickup apparatus, mobile terminal, and manufacturing method of image pickup lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |