CN100380158C - Optical lenses for image formation - Google Patents
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- CN100380158C CN100380158C CNB2005100723853A CN200510072385A CN100380158C CN 100380158 C CN100380158 C CN 100380158C CN B2005100723853 A CNB2005100723853 A CN B2005100723853A CN 200510072385 A CN200510072385 A CN 200510072385A CN 100380158 C CN100380158 C CN 100380158C
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Abstract
The present invention relates to an optical lens for image formation, which is composed of a first lens, a second lens and a third lens, wherein the first lens is a crescent plastic positive lens, the convex surface of which faces the front, the curvature radiuses of the front and the back surfaces of the first lens are L1R1 and L1R2 respectively and need to satisfy the relationship of |L1R1/L1R2|<0.5, and the center thickness of the first lens is controlled to satisfy CT1<1.0mm; the second lens is a crescent plastic negative lens, the concave surface of which faces the front, and the center thickness of the second lens is controlled to satisfy CT2<0.6mm; the third lens is a crescent plastic positive lens, the convex surface of which faces the front, the curvature radiuses of the front and the back surfaces of the third lens are L3R1 and L3R2 respectively and satisfy the relationship of |L3R1/L1R2|>0.3. In the present invention, an infrared filtering basic filter is arranged in the optical lens, and a diaphragm is arranged between the first lens and the second lens. The present invention can effectively reduce the volume of a lens group and can obtain higher image resolution simultaneously through the lens structure, the ranging mode and the lens collocation.
Description
Technical field
The present invention is the optical lenses for image formation that a kind of small image extraction device uses, it is relevant with the single-focus lens group of general small image extraction device, be meant three combinations that aspherical plastic lens constituted of utilization especially, and be the brand-new optical lenses for image formation design of adopting mid-aperture pattern configurations to form.
Background technology
Because phtographic lens is more and more extensive in the utilization scope in modern times, and along with the continuous growth of consumer electronics industry, market increases day by day to the demand of small image extraction module now.
Particularly in the industry of mobile phone camera, computer network camera, or the application of vehicle safety imaging monitoring device etc.; The user promotes again and again to the requirement of product, and not only separating the picture quality must be good, and product appearance is also compact;
The photosensory assembly of general digital single-focus lens group is nothing more than being two kinds of CCD or CMOS, the sensitivity meeting of its sensitization increases and decay fast with camera lens emergent light angle, therefore general digital single focus camera lens all adopts the Telecentric structure, produce when avoiding light incident photosensory assembly and hide angle (Shading), and the normal structure of using 3～4 eyeglasses to form in the camera lens module more than mega pixel, product camera lens height overall is about between 5.5～7mm; Commonly use digital single-focus lens and after configuration mode practicality like this, still have following technical difficulties:
One, the above camera lens module of mega pixel is the consideration brightness problem, emergence angle need be dwindled usually, so system needs bigger space come flexion light; But, the optical system height overall of aforementioned arrangements (promptly can't dwindle) between 5.5～7mm mostly again, even if following manufacture of semiconductor is constantly progressive, and makes the size of picture element dwindle, but can make the requirement of resolving power higher relatively, the demand in camera lens space still is critical.
Its two, existing digital single-focus lens generally can adopt the form of preposition aperture, but the configuration of preposition aperture can make the parasitic light of system increase in order to revise aberration, the sensitivity of simultaneity factor also increases, and therefore, causes the degree of difficulty on the producer designs to improve.
Lift United States Patent (USP) U.S.Pat.No.6 in addition at this, 441,971B2 is an example, it is to emphasize large aperture (f/2.5), the new invention that the lens group size is little, case usability optical assembly dimensions is 1/4 inch before quoting as proof, yet its height overall (from the camera lens front end to imaging surface) still reaches 5.3mm, and in the field of small image extraction camera lens now, the so every shortening of lens group height overall 0.1mm can cause significantly decay to separating as quality; Therefore, dwindling the camera lens height and can take into account in the research of high resolution, we must find more effective technology.
In order effectively to solve the aforementioned practical problems of commonly using digital single-focus lens, technology and experience that the inventor was accumulated in the optical device field based on the past, set about from the angle of saving space, increase usefulness, finally develop the brand-new pattern that optical lenses for image formation of the present invention, and reach the effect of dwindling mirror group volume, obtaining high resolution.
Summary of the invention
First purpose of the present invention provides a kind of optical lenses for image formation that can dwindle mirror group volume, the present invention's first lens are convex surface meniscus plastics positive lens forward, and control the center thickness CT1＜1.0mm of these first lens, these second lens are concave surface meniscus plastics negative lens forward, control the center thickness CT2＜0.6mm of these second lens, this prismatic glasses then is a convex surface meniscus plastics positive lens forward, in addition infrared ray filtering optical filter is included in the lens barrel of optical lens; By this lens arrangement, arrangement mode and eyeglass configuration, the present invention can effectively dwindle mirror group volume, more can acquire higher resolving power simultaneously.
Second purpose of the present invention provides the better optical lenses for image formation of a kind of image quality, the radius-of-curvature of the present invention's first lens front and rear surfaces is respectively L1R1 and L1R2, both need satisfy | the relation of L1R1/L1R2|＜0.5, this prismatic glasses then is a convex surface meniscus plastics positive lens forward, the radius-of-curvature of its front and rear surfaces is respectively L3R1 and L3R2, and both satisfy | the relation of L3R1/L3R2|＞0.3; By this lens arrangement design, the present invention can acquire higher resolving power.
The 3rd purpose of the present invention provides a kind of optical lenses for image formation that can effectively suppress parasitic light, and the present invention places aperture between first lens and second lens; By this structural shape, the present invention can effectively suppress parasitic light.
As follows for reaching the technical scheme that the foregoing invention purpose adopted: a kind of optical lenses for image formation, there are first lens, second lens and the 3rd combination of lenses to constitute in regular turn by thing side to imaging side, it comprises: these first lens, its tool positive refracting power, the front surface of first lens is that convex surface, rear surface are concave surface, the radius-of-curvature of its front and rear surfaces is respectively L1R1 and L1R2, and both satisfy | the relation of L1R1/L1R2|＜0.5, and first lens are provided with aspheric surface; One aperture is arranged at after first lens, is used to control optical lens brightness; These second lens are arranged on after this aperture, and its tool negative refraction power be convex surface and the front surface of second lens is concave surface, rear surface, and second lens is provided with aspheric surface; The 3rd lens are arranged at after second lens tool positive refracting power, the front surface of the 3rd lens is that convex surface, rear surface are concave surface, the radius-of-curvature of its front and rear surfaces is respectively L3R1 and L3R2, and both satisfy | L3R1/L3R2|＞0.3, and the 3rd lens are provided with aspheric surface.
The focal length of first lens, second lens and the 3rd lens is respectively f1, f2, f3, and the synthetic focal length of this optical lens is f, and four meet the following conditions:
1.5＞|f/f1|＞1.0
1.2＞|f/f2|＞0.7
1.2＞|f/f3|＞0.3。
The center thickness of first lens and second lens is respectively CT1 and CT2, and both satisfy following condition:
CT1＜1.0mm
CT2＜0.6mm。
Include an infrared ray filtering optical filter in this optical lens, infrared ray filtering optical filter is arranged at after the 3rd lens.
The Abbe number of first lens, second lens is respectively v1, v2, and both satisfy following condition:
v1＞45
v2＜45。
Aperture is d to the imaging surface distance, and system's image height is h, and both satisfy following relation:
1.15＜|d/h|＜2.5。
First lens, the 3rd lens front surface k value are respectively L1k1 and L3k1, and both satisfy following condition:
L1k1＜0
L3k1＜-5。
As a kind of optimized technical scheme, the Abbe number v2 and the center thickness CT2 of the present invention's second lens meet the following conditions:
The Abbe number v2 of second lens, satisfy following condition:
v2＜29；
The center thickness CT2 of second lens, satisfy following condition:
CT2＜0.45mm。
Beneficial effect of the present invention is:
1. a kind of optical lenses for image formation that can dwindle mirror group volume provided by the invention, the present invention's first lens are convex surface meniscus plastics positive lens forward, and control the center thickness CT1＜1.0mm of these first lens, these second lens are concave surface meniscus plastics negative lens forward, control the center thickness CT2＜0.6mm of these second lens, this prismatic glasses then is a convex surface meniscus plastics positive lens forward, in addition infrared ray filtering optical filter is included in the lens barrel of optical lens; By this lens arrangement, arrangement mode and eyeglass configuration, the present invention can effectively dwindle mirror group volume, more can acquire the effect of higher resolving power simultaneously;
2. the better optical lenses for image formation of a kind of image quality provided by the invention, the radius-of-curvature of the present invention's first lens front and rear surfaces is respectively L1R1 and L1R2, both need satisfy | the relation of L1R1/L1R2|＜0.5, this prismatic glasses then is a convex surface meniscus plastics positive lens forward, the radius-of-curvature of its front and rear surfaces is respectively L3R1 and L3R2, and both satisfy | the relation of L3R1/L3R2|＞0.3; By this lens arrangement design, the present invention can acquire the effect of higher resolving power;
3. a kind of optical lenses for image formation that can effectively suppress parasitic light provided by the invention, the present invention places aperture between first lens and second lens; By this structural shape, the present invention can effectively suppress the effect of parasitic light.
Description of drawings
Fig. 1 first embodiment synoptic diagram.
Fig. 2 first embodiment aberration curve figure.
Fig. 3 second embodiment synoptic diagram.
Fig. 4 second embodiment aberration curve figure.
Fig. 5 first embodiment optical data table.
Fig. 6 second embodiment optical data table.
The primary clustering symbol description
Aperture 10 first lens 20
Convex surface 21 second lens 30
Convex surface 41 infrared ray filtering optical filters 50
Photosensory assembly cover glass 60
Guang learns Jing Tou Group 100
System's focal distance f
First focal length of lens f1
Second focal length of lens f2
The 3rd focal length of lens f3
The first lens front surface radius-of-curvature L1R1
The first lens rear surface radius-of-curvature L1R2
The 3rd lens front surface radius-of-curvature L3R1
The 3rd lens rear surface radius-of-curvature L3R2
The first lens center thickness CT1
The second lens center thickness CT2
The first lens Abbe number v1
The second lens Abbe number v2
Iris diaphragm plate to imaging surface apart from d
The image height h of system
The k value L1k1 of the first lens front surface
The k value L3k1 of the 3rd lens front surface
Embodiment
The technology of relevant this case invention for reaching above-mentioned purpose, being adopted, means and other effect, now enumerate several preferred embodiments and cooperate graphic detailed description as after, believe purpose, feature and other advantage of this case invention, when can by one deeply and concrete understanding:
See also the different numerical value change tables of the optical lenses for image formation embodiment shown in Fig. 5 .6; the all true gained of testing of the numerical value change of each embodiment of the present invention; both used the product of different numerical value, same structure must belong to protection category of the present invention, stated clearly in advance at this.
The optical lenses for image formation of first embodiment of the invention includes assemblies such as first lens 20, aperture 10, second lens 30, the 3rd lens 40, infrared ray filtering optical filter 50, photosensory assembly cover glass (SensorCoverGlass) 60 and imaging surface 70; optical lenses for image formation of the present invention promptly is the optical system that the aforementioned structure assembly constitutes, and its primary structure is described as follows (eyeglass of first embodiment is formed as shown in Figure 1):
Whole optical lenses for image formation 100 by the thing side extremely as side is in regular turn: first lens 20, aperture 10, second lens 30, the 3rd lens 40, infrared ray filtering optical filter 50, photosensory assembly cover glass (SensorCoverGlass) 60 and imaging surface 70, and be provided with aspheric surface on each minute surface of these first lens 20, second lens 30 and the 3rd lens 40, its architectural feature is;
These first lens 20 are the positive lens eyeglass of the meniscus shape of tool positive refracting power, the convex surface 21 of these first lens 20 forward, with the astigmatism and the curvature of field that produces in the balance optical system;
These second lens 30, for shape is lunate negative lens, the concave surface 31 of these second lens 30 is forward;
The 3rd lens 40 are a convex surface 41 positive lens forward;
This infrared ray filtering optical filter 50 for having the sheet glass of infrared ray filtration result, and does not influence the focal length of system;
This photosensory assembly cover glass 60 is the sheet glass of the focal length that do not influence system.
These first lens 20 are convex surface meniscus plastics positive lens forward, the radius-of-curvature of its front and rear surfaces is respectively L1R1 and L1R2, both satisfy | the relation of L1R1/L1R2|＜0.5, and the focal distance f 1 of controlling these first lens is possessed following relationship with system's focal distance f: 1.0＜| f/f1|＜1.5, the center thickness CT1＜1.0mm of these first lens, abbe number Abbe number v1＞45 of controlling these first lens, front surface k value L1k1＜0;
These second lens 30 are concave surface meniscus plastics negative lens forward, control the focal distance f 2 of these second lens and possess following relationship with system's focal distance f: 0.7＜| f/f2|＜1.2, center thickness CT2＜the 0.6mm of these second lens in addition controls abbe number Abbe number v2＜45 of these second lens;
40 on the 3rd lens are convex surface meniscus plastics positive lens forward, and the radius-of-curvature of its front and rear surfaces is respectively L3R1 and L3R2, and both satisfy
| the relation of L3R1/L3R2|＞0.3, front surface k value L3k1＜-5 of the 3rd lens 40, the focal distance f 3 of controlling the 3rd lens 40 satisfies following relationship with system's focal distance f: 0.3＜| f/f3|＜1.2;
Owing to be provided with aspheric surface on each eyeglass of the present invention, and aperture 10 placed between first lens 20 and second lens 30, and infrared ray filtering optical filter 50 is included in the lens barrel.
In addition, the aperture 10 of this imaging mirror group optical system is d to imaging surface 70 distances, and system's image height is h, and both satisfy note relation down: 1.15＜| d/h|＜2.5.
The eyeglass of the second embodiment of the present invention is formed as shown in Figure 3, and whole optical lenses for image formation 100 by the thing side extremely as side is in regular turn: first lens 20, aperture 10, second lens 30, the 3rd lens 40, infrared ray filtering optical filter 50, photosensory assembly cover glass 60 and imaging surface 70:
These second lens 30 are the lunate negative lens of shape, and concave surface 31 forward;
The 3rd lens 40 form a convex surface 41 positive lens forward, and are provided with aspheric surface on each minute surface of these first lens 20, second lens 30 and the 3rd lens 40;
This infrared ray filtering optical filter 50, photosensory assembly cover glass 60 all are sheet glass, can not influence the focal length of system, and the imaging effect of system is reached by its aspheric first lens 20, second lens 30 and the 3rd lens 40.
The detailed optical data of second embodiment also sees also Fig. 6, the center thickness CT2＜0.45mm of second lens 30 of second embodiment of the invention, Abbe number v2＜29 in addition.In addition, the relevant aberration curve of second embodiment of the invention sees also Fig. 4.
The imaging effect of the aforementioned first embodiment system is reached by its aspheric first lens 20, second lens 30 and the 3rd lens 40, and the requirement of every optical data is as described below, sees also Fig. 5.
The equation of aspheric curve is expressed as follows:
X(Y)＝(Y
2/R)/(1+sqrt(1-(1+k)*(Y/R)
2))+A
4*Y
4+A
6*Y
6+…
Wherein:
X: the cross-sectional distance of eyeglass
Y: the point on the aspheric curve is apart from the height of optical axis
K: conical surface coefficient
K=0 SPHERE sphere
K＜-1 HYPER-BOLID hyperboloid
K＞oblate the sphere of 0 OBLATE SPHEROID
A
4, A
6...: 4 rank, 6 rank ... asphericity coefficient.
The radius-of-curvature of these first lens, 20 front and rear surfaces is respectively L1R1 and L1R2, both satisfy | the relation of L1R1/L1R2|＜0.5, spherical aberration is reduced, the radius-of-curvature of the 3rd lens 40 front and rear surfaces is respectively L3R1 and L3R2, both satisfy | the relation of L3R1/L3R2|＞0.3, with the off-axis aberration of this update the system;
This aperture 10 places in the middle of first lens 20 and second lens 30, because this aperture 10 of the present invention places after first lens 20, rather than before being placed on first lens 20 as known techniques, can reach the Expected Results that suppresses parasitic light with this.
In addition, control the k value L1k1 of these first lens, 20 front surfaces 21, the k value L3k1 of the 3rd lens 40 front surfaces 41 and satisfy following relationship:
L1k1＜0
L3k1＜-5
So can further reduce the generation of parasitic light.
Control these first lens, 20 focal distance f 1, these second lens, 30 focal distance f 2, the 3rd lens 40 focal distance f 3 and system's focal distance f and satisfy following relationship:
1.5＞|f/f1|＞1.0
1.2＞|f/f2|＞0.7
1.2＞|f/f3|＞0.3
By above-mentioned configuration, can effectively reduce the aberration of system and obtain good image quality.
Control these first lens 20 center thickness CT1 and this second lens 30 center thickness CT2 satisfy following condition:
CT1＜1.0mm
CT2＜0.6mm
So can effectively revise the height of astigmatism and reduction optical system.
In addition, in lens group 100, include an infrared ray filtering optical filter 50, it is to be arranged at after the prismatic glasses 40, because infrared ray filtering optical filter 50 of the present invention is to be included in the lens barrel of whole set of shots group 100, not to be placed at outside the lens barrel, so can save burnt space, back, and then lens group 100 height overalls are shortened as located by prior art.
Control the Abbe number v1 of these first lens 20, the Abbe number v2 of these second lens 30 and satisfy following condition, with this can effectively update the system be produced aberration:
v1＞45?v2＜45。
Abbe?number：V＝(N
d-1)/(N
f-N
c)
Wherein: N
d, N
f, N
cIt is respectively refractive index to helium Dline (587.6nm), hydrogen F line (486.1nm), hydrogen C line (656.3nm); Δ N=N
f-N
c: the degree of expression material dispersion; Δ N
d-1: the ability of expression material refractive power.
On the other hand, this present invention's imaging mirror group 100 optical system, its aperture 10 is d to imaging surface 70 distances, and system's image height is h, and both satisfy following relation:
1.15＜|d/h|＜2.5
Angle with this may command light incident photosensory assembly is unlikely excessive.
The relevant aberration curve of first embodiment of the invention sees also Fig. 2; By aforesaid structure of the present invention and configuration, the present invention can be reduced to the height overall of optical lenses for image formation 100 below the 5mm, and improves resolving power in the lump in addition; The detailed optical data of above first embodiment of the invention sees also Fig. 5.
What this will specify be, the embodiment data of Fig. 5 of the present invention only are the best reference value of implementing, and real feature of the present invention still is structure, assembly and the lens condition of optical lenses for image formation, but relevant implementation data this just no longer giving unnecessary details more.
Center thickness CT2＜0.45mm, Abbe numberv2＜29 of second lens 30 of second embodiment of the invention can further reduce system aberration and revise aberration with this; This case second embodiment is consistent with principle, the architectural feature of first embodiment, so have the patentability effect equally, seldom gives unnecessary details at this.
By structure, data and the system configuration of above-mentioned eyeglass, the present invention can reach following target:
One, optical lenses for image formation of the present invention have good image quality, large aperture and lower manufacturing cost;
Its two, the present invention can effectively shorten the height of lens group, when usability optical assembly dimensions was 1/4 inch, its camera lens front end to the distance of imaging surface was about 5mm;
Its three, optical lenses for image formation of the present invention can effectively suppress the formation of parasitic light, and has higher manufacturing degree of stability.
In sum, innovation structure design of the present invention is utilization first lens, second lens and the 3rd lens constitute, these first lens are convex surface meniscus plastics positive lens forward, the radius-of-curvature of its front and rear surfaces is respectively L1R1 and L1R2, both need satisfy | the relation of L1R1/L1R2|＜0.5, and control the center thickness CT1＜1.0mm of these first lens, these second lens are concave surface meniscus plastics negative lens forward, control the center thickness CT2＜0.6mm of these second lens, this prismatic glasses then is a convex surface meniscus plastics positive lens forward, the radius-of-curvature of its front and rear surfaces is respectively L3R1 and L3R2, both satisfy | the relation of L3R1/L3R2|＞0.3, and aperture places between first lens and second lens in addition; Mirror group volume can be effectively dwindled in scioptics structure, arrangement mode and eyeglass configuration, more can acquire higher resolving power simultaneously.
Claims (8)
1. an optical lenses for image formation has first lens, second lens and the 3rd combination of lenses to constitute by thing side to imaging side in regular turn, it is characterized in that it comprises:
These first lens, its tool positive refracting power, the front surface of first lens are that convex surface, rear surface are concave surface, and the radius-of-curvature of its front and rear surfaces is respectively L1R1 and L1R2, and both satisfy | the relation of L1R1/L1R2|＜0.5, and first lens are provided with aspheric surface;
One aperture is arranged at after first lens, is used to control optical lens brightness;
These second lens are arranged on after this aperture, and its tool negative refraction power be convex surface and the front surface of second lens is concave surface, rear surface, and second lens is provided with aspheric surface;
The 3rd lens are arranged at after second lens tool positive refracting power, the front surface of the 3rd lens is that convex surface, rear surface are concave surface, the radius-of-curvature of its front and rear surfaces is respectively L3R1 and L3R2, and both satisfy | L3R1/L3R2|＞0.3, and the 3rd lens are provided with aspheric surface; And
The focal length of aforementioned first lens, second lens and the 3rd lens is respectively f1, f2, f3, and the synthetic focal length of this optical lens is f, and four meet the following conditions:
1.5＞|f/f1|＞1.0
1.2＞|f/f2|＞0.7
1.2＞|f/f3|＞0.3。
2. optical lenses for image formation according to claim 1 is characterized in that: the center thickness of first lens and second lens, be respectively CT1 and CT2, and both satisfy following condition:
CT1＜1.0mm
CT2＜0.6mm。
3. optical lenses for image formation according to claim 1 is characterized in that: include an infrared ray filtering optical filter in this optical lens, infrared ray filtering optical filter is arranged at after the 3rd lens.
4. optical lenses for image formation according to claim 1 is characterized in that: the Abbe number of first lens, second lens is respectively v1, v2, and both satisfy following condition:
v1＞45
5. optical lenses for image formation according to claim 1 is characterized in that: aperture is d to the imaging surface distance, and system's image height is h, and both satisfy following relation:
1.15＜|d/h|＜2.5。
6. optical lenses for image formation according to claim 1 is characterized in that: first lens, the 3rd lens front surface k value are respectively L1k1 and L3k1, and both satisfy following condition:
L1k1＜0
L3k1＜-5。
7. according to the optical lenses for image formation shown in the claim 1, it is characterized in that: the Abbenumber v2 of second lens, satisfy following condition:
v2＜29。
8. optical lenses for image formation according to claim 1 is characterized in that: the center thickness CT2 of second lens, satisfy following condition:
CT2＜0.45mm。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100723853A CN100380158C (en) | 2005-05-31 | 2005-05-31 | Optical lenses for image formation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100723853A CN100380158C (en) | 2005-05-31 | 2005-05-31 | Optical lenses for image formation |
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|---|---|
| CN1873460A CN1873460A (en) | 2006-12-06 |
| CN100380158C true CN100380158C (en) | 2008-04-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI408408B (en) | 2009-06-19 | 2013-09-11 | E Pin Optical Industry Co Ltd | Miniature three-piece optical lens with short back focal length |
| TW201200928A (en) | 2010-06-30 | 2012-01-01 | E Pin Optical Industry Co Ltd | Three-piece pickup lens |
| TWI689750B (en) * | 2019-03-20 | 2020-04-01 | 大立光電股份有限公司 | Optical lens assembly and electronic device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288166A (en) * | 1999-09-09 | 2001-03-21 | 恩普乐股份有限公司 | Lens for taking picture |
| US20040190158A1 (en) * | 2003-03-31 | 2004-09-30 | Kenichi Sato | Single focus lens |
| US20040190162A1 (en) * | 2003-03-31 | 2004-09-30 | Kenichi Sato | Single focus lens |
| US20050002116A1 (en) * | 2003-06-13 | 2005-01-06 | Enplas Corporation | Imaging lens system |
| US20050041306A1 (en) * | 2003-01-20 | 2005-02-24 | Eiki Matsuo | Imaging lens |
-
2005
- 2005-05-31 CN CNB2005100723853A patent/CN100380158C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288166A (en) * | 1999-09-09 | 2001-03-21 | 恩普乐股份有限公司 | Lens for taking picture |
| US20050041306A1 (en) * | 2003-01-20 | 2005-02-24 | Eiki Matsuo | Imaging lens |
| US20040190158A1 (en) * | 2003-03-31 | 2004-09-30 | Kenichi Sato | Single focus lens |
| US20040190162A1 (en) * | 2003-03-31 | 2004-09-30 | Kenichi Sato | Single focus lens |
| US20050002116A1 (en) * | 2003-06-13 | 2005-01-06 | Enplas Corporation | Imaging lens system |
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