CN101995641A - Photographic lens system - Google Patents
Photographic lens system Download PDFInfo
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- CN101995641A CN101995641A CN2009101680711A CN200910168071A CN101995641A CN 101995641 A CN101995641 A CN 101995641A CN 2009101680711 A CN2009101680711 A CN 2009101680711A CN 200910168071 A CN200910168071 A CN 200910168071A CN 101995641 A CN101995641 A CN 101995641A
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Abstract
The invention provides a photographic lens system, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a diaphragm from an object side to an image side, wherein the first lens has positive refractive power, and the surface of the object side of the first lens is a convex surface; the second lens has negative refractive power; the surface of the image side of the third lens is a concave surface; the fourth lens has the positive refractive power; the fifth lens has the negative refractive power, the surface of the image side of the fifth lens is a concave surface, and at least one surface of the fifth lens has at least one inflexion point; and the diaphragm is arranged between the photographed object and the third lens. In the photographic lens system, the optical axis distance between the first lens and the second lens is T12, the focal distance of the whole photographic lens system is f, and the following formula is met: the product of (T12/f) and 100 is more than 0.5 and less than 15. In the invention, through the configuration, system aberration can be effectively corrected to improve imaging quality, the total optical length of the photographic lens system can be effectively shortened, and the system has the characteristic of broad vision angle.
Description
Technical field
The present invention is about a kind of camera-lens system, particularly about a kind of camera-lens system that is applied to mobile phone camera.
Background technology
Recent years, rise along with mobile phone camera, the demand of miniaturization phtographic lens day by day improves, and the photo-sensitive cell of general phtographic lens is nothing more than being sensitization coupling element (Charge Coupled Device, CCD) or CMOS (Complementary Metal-Oxide Semiconductor, CMOS) two kinds, and because the progress of semiconductor process techniques, make the elemental area of photo-sensitive cell dwindle, the miniaturization phtographic lens is gradually toward the development of high pixel field, therefore, the requirement to image quality also increases day by day.
Tradition is equipped on the miniaturization phtographic lens of mobile phone camera, and as United States Patent (USP) the 7th, 365, shown in No. 920, it is main adopting the four-piece type lens arrangement more; But because the pixel of mobile phone camera is very fastly soaring, the elemental area of photo-sensitive cell dwindles gradually, and under the situation that the requirement of system imaging quality improves constantly, known four-piece type lens combination can't satisfy the more phtographic lens module of high-order, and because constantly past lightening, the high performance trend development of electronic product, therefore be badly in need of a kind ofly can be used for the high-pixel mobile phone camera, and be unlikely to the camera-lens system that makes the camera lens total length long.
Summary of the invention
The invention provides a kind of camera-lens system, extremely comprise in regular turn as side by the thing side: first lens of the positive refracting power of a tool, its thing side surface is a convex surface; Second lens of the negative refracting power of one tool; One the 3rd lens, it is a concave surface as side surface; The 4th lens of the positive refracting power of one tool; The 5th lens of the negative refracting power of one tool, it is a concave surface as side surface, and at least one surface of described the 5th lens is provided with at least one point of inflexion; And an aperture, be arranged between object and described the 3rd lens; In the wherein said camera-lens system, described first lens and the distance of described second lens on optical axis are T12, and the focal length of whole camera-lens system is f, satisfies following relational expression: 0.5＜(T12/f) * 100＜15.
The present invention is by above-mentioned configuration mode, and effectively the update the system aberration to be promoting image quality, and can the while effectively shorten the optics total length of camera-lens system, and has the characteristic of Wide-angle concurrently.
The above-mentioned camera-lens system of the present invention provides positive refracting power by described first lens, and when aperture placed object side near described camera-lens system, can effectively shorten the optics total length of described camera-lens system.In addition, above-mentioned configuration can make the outgoing pupil (Exit Pupil) of camera-lens system away from imaging surface, therefore, light will be incident in the mode near vertical incidence on the photo-sensitive cell, this is the heart far away (Telecentric) characteristic of picture side, heart characteristic far away is very important for the photoperceptivity of now solid-state electronic photo-sensitive cell, can make the sensitization susceptibility of sense electronics optical element improve, and the minimizing system produces the possibility at dark angle.In addition, the present invention is provided with the point of inflexion at the 5th lens of aforementioned camera-lens system, and can more effectively suppress light and be incident in angle on the photo-sensitive cell from the axle visual field, and the further aberration of modified off-axis visual field.In addition, in the aforementioned camera-lens system of the present invention, when aperture being placed approaching more described the 3rd lens place, the characteristic that can help Wide-angle, help to receive the correction of poor (Chromatic Aberration ofMagnification), and can effectively reduce the susceptibility of described camera-lens system distorting (Distortion) and multiplying power look.In other words, in the aforementioned camera-lens system of the present invention, when aperture being placed more near the object place, focus on heart characteristic far away, the optics total length of whole camera-lens system can be shorter; When aperture being placed approaching more described the 3rd lens place, then focus on the characteristic of Wide-angle, can effectively reduce the susceptibility of described camera-lens system.
On the other hand, the invention provides another kind of camera-lens system, extremely comprise in regular turn as side by the thing side: first lens of the positive refracting power of a tool, its thing side surface is a convex surface; Second lens of the negative refracting power of one tool; The 3rd lens of the negative refracting power of one tool; The 4th lens of the positive refracting power of one tool, its thing side surface and be respectively concave surface and convex surface as side surface; The 5th lens of the negative refracting power of one tool, it is a concave surface as side surface, and at least one surface of described the 5th lens is provided with at least one point of inflexion; And an aperture, be arranged between object and described the 3rd lens; In the wherein said camera-lens system, described first lens and the distance of described second lens on optical axis are T12, and the focal length of whole camera-lens system is f, satisfies following relational expression: 0.5＜(T12/f) * 100＜15.
The 3rd lens described in the above-mentioned camera-lens system of the present invention are negative refracting power, and Petzval and number (Petzval Sum) that can more effective update the system make peripheral image planes become more flat.In addition, the 4th lens described in the aforementioned camera-lens system of the present invention, its thing side surface and be respectively concave surface and convex surface, the effectively astigmatism of update the system (Astigmatism) as side surface.Moreover, in the aforementioned camera-lens system of the present invention,, focus on heart characteristic far away when aperture is placed near object side, can also make the optics total length of camera-lens system become shorter; When aperture being placed approaching more described the 3rd lens place, then focus on the characteristic of Wide-angle, can effectively reduce the susceptibility of described camera-lens system.
Description of drawings
Fig. 1 is the optical system synoptic diagram of first embodiment of the invention.
Fig. 2 is the aberration curve figure of first embodiment of the invention.
Fig. 3 is the optical system synoptic diagram of second embodiment of the invention.
Fig. 4 is the aberration curve figure of second embodiment of the invention.
Fig. 5 is the optical system synoptic diagram of third embodiment of the invention.
Fig. 6 is the aberration curve figure of third embodiment of the invention.
Fig. 7 is a table one, is the optical data of first embodiment of the invention.
Fig. 8 is a table two, is the aspherical surface data of first embodiment of the invention.
Fig. 9 is a table three, is the optical data of second embodiment of the invention.
Figure 10 is a table four, is the aspherical surface data of second embodiment of the invention.
Figure 11 is a table five, is the optical data of third embodiment of the invention.
Figure 12 is a table six, is the aspherical surface data of third embodiment of the invention.
Figure 13 is a table seven, is the numeric data of correlationship formula of the present invention.
Drawing reference numeral
First lens 100,300,500
Thing side surface 101,301,501
Picture side surface 102,302,502
Second lens 110,310,510
Thing side surface 111,311,511
Picture side surface 112,312,512
The 3rd lens 120,320,520
Thing side surface 121,321,521
Picture side surface 122,322,522
The 4th lens 130,330,530
Thing side surface 131,331,531
Picture side surface 132,332,532
The 5th lens 140,340,540
Thing side surface 141,341,541
Picture side surface 142,342,542
Aperture 150,350,550
Infrared ray filtering optical filter 160,360,560
Imaging surface 170,370,570
The focal length of whole camera-lens system is f
The focal length of first lens is f1
The focal length of the 4th lens is f4
The focal length of the 5th lens is f5
First lens and the distance of second lens on optical axis are T12
The abbe number of first lens is V1
The abbe number of second lens is V2
The abbe number of the 3rd lens is V3
The thing side surface radius-of-curvature of first lens is R1
Second lens be R4 as the side surface radius-of-curvature
Promising half moon-shaped lens in the 3rd lens, the 4th lens and the 5th lens,
The thing side surface radius-of-curvature of described crescent lens is R
o, described crescent lens be R as the side surface radius-of-curvature
i
The thing side surface of first lens to the distance of sense electronics optical element on optical axis is TTL
Half of sense electronics optical element effective pixel area diagonal angle line length is ImgH
Embodiment
The invention provides a kind of camera-lens system, extremely comprise in regular turn as side by the thing side: first lens of the positive refracting power of a tool, its thing side surface is a convex surface; Second lens of the negative refracting power of one tool; One the 3rd lens, it is a concave surface as side surface; The 4th lens of the positive refracting power of one tool; The 5th lens of the negative refracting power of one tool, it is a concave surface as side surface, and at least one surface of described the 5th lens is provided with at least one point of inflexion; And an aperture, be arranged between object and described the 3rd lens; In the wherein said camera-lens system, described first lens and the distance of described second lens on optical axis are T12, and the focal length of whole camera-lens system is f, satisfies following relational expression: 0.5＜(T12/f) * 100＜15.
In the aforementioned camera-lens system of the present invention, the described positive refracting power of the first lens tool and its thing side surface are convex surface, can effectively shorten the optics total length of described camera-lens system; The described second lens tool is born refracting power, helps the aberration (Chromatic Aberration) of update the system; Described the 3rd lens can be negative refracting power or positive refracting power lens, when the negative refracting power of described the 3rd lens tool, Petzval and number (Petzval Sum) that can more effective update the system, make peripheral image planes become more flat, when the positive refracting power of described the 3rd lens tool, then help revisal to system's higher order aberratons; The positive refracting power of described the 4th lens tool can effectively distribute the positive refracting power of described first lens, to reduce the susceptibility of described camera-lens system; Described the 5th lens tool is born refracting power, can form one just with described the 4th lens, negative looking in the distance (Telephoto) structure, can effectively shorten the optics total length of described camera-lens system.
In the aforementioned camera-lens system of the present invention, described first lens and the distance of described second lens on optical axis are T12, and the focal length of whole camera-lens system is f, satisfies following relational expression: 0.5＜(T12/f) * 100＜15.When T12/f satisfies the above-mentioned relation formula, can prevent the excessive increase of astigmatism.
In the aforementioned camera-lens system of the present invention, preferably, described second lens be concave surface as side surface, with the back focal length of the described camera-lens system of effective increase, make to have enough spaces between described the 5th lens and the imaging surface and place other member.
Further, in the aforementioned camera-lens system of the present invention, preferably, the thing side surface of described the 3rd lens is a convex surface, can help the higher order aberratons of update the system, with the elevator system image quality; And the thing side surface of described the 4th lens and be respectively concave surface and convex surface, the effectively astigmatism of update the system as side surface.
Further, in the aforementioned camera-lens system of the present invention, the abbe number of described first lens (AbbeNumber) is V1, the abbe number of second lens is V2, preferably, satisfies following relational expression: V1-V2＞20, with effective correction aberration, more preferably, satisfy following relational expression: V1-V2＞30.
Further, in the aforementioned camera-lens system of the present invention, the focal length of whole camera-lens system is f, and the focal length of described first lens is f1, preferably, satisfies following relational expression: 1.0＜f/f1＜1.8.When f/f1 satisfies the above-mentioned relation formula, the refracting power size configure of described first lens is balance comparatively, optics total length with effective shortening system, and can avoid high-order spherical aberration (High Order Spherical Aberration) excessively to increase simultaneously, and then lifting image quality, more preferably, satisfy following relational expression: 1.2＜f/f1＜1.6.
Further, in the aforementioned camera-lens system of the present invention, the focal length of described the 4th lens is f4, and the focal length of described the 5th lens is f5, preferably, satisfies following relational expression :-1.5＜f4/f5＜-0.5.When f4/f5 satisfies the above-mentioned relation formula, can effectively guarantee the structure of looking in the distance that the 4th lens and the 5th lens formed positive are negative, help to shorten the optics total length of system.
Further, in the aforementioned camera-lens system of the present invention, preferably, promising half moon-shaped lens satisfy following condition in described the 3rd lens, the 4th lens and described the 5th lens, wherein R
oBe the thing side surface radius-of-curvature of described crescent lens, R
iPicture side surface radius-of-curvature for described crescent lens: 0.5＜R
o/ R
i＜2.0, be unlikely to excessive with the refracting power of controlling described lens, can effectively reduce the susceptibility of system.
In the aforementioned camera-lens system of the present invention, the thing side surface radius-of-curvature of described first lens is R1, and the focal length of whole camera-lens system is f, preferably, satisfies following relationship formula: 0.2＜R1/f＜0.4.When R1/f satisfies the above-mentioned relation formula, can effectively reduce the optics total length of described camera-lens system, and can avoid higher order aberratons excessively to increase.
Further, in the aforementioned camera-lens system of the present invention, described aperture is arranged between object and described first lens, and helping in heart characteristic far away, the optics total length of whole camera-lens system can be shorter.
Further, in the aforementioned camera-lens system of the present invention, other is provided with a sense electronics optical element for the object imaging thereon, the thing side surface of described first lens to the distance of described sense electronics optical element on optical axis is TTL, and half of described sense electronics optical element effective pixel area diagonal angle line length is ImgH, preferably, satisfy following relational expression: TTL/ImgH＜2.0.When TTL/ImgH satisfies the above-mentioned relation formula, help keeping the miniaturization of camera-lens system, to be equipped on the frivolous portable electronic product.
Further, in the aforementioned camera-lens system of the present invention, described second lens be R4 as the side surface radius-of-curvature, the focal length of whole camera-lens system is f, preferably, satisfies following relationship formula: 0.7＜R4/f＜1.2.When R4/f satisfies the above-mentioned relation formula, the effective aberration of update the system, and be unlikely to make camera-lens system to produce excessive back focal length simultaneously, help the miniaturization of the system that keeps.
In the aforementioned camera-lens system of the present invention, the abbe number of described second lens (Abbe Number) is V2, and the abbe number of the 3rd lens is V3, preferably, satisfies following relational expression: | V2-V3|＜15, with the aberration of effective update the system.
The present invention provides another kind of camera-lens system on the other hand, is extremely comprised in regular turn as side by the thing side: first lens of the positive refracting power of a tool, and its thing side surface is a convex surface; Second lens of the negative refracting power of one tool; The 3rd lens of the negative refracting power of one tool; The 4th lens of the positive refracting power of one tool, its thing side surface and be respectively concave surface and convex surface as side surface; The 5th lens of the negative refracting power of one tool, it is a concave surface as side surface, and at least one surface of described the 5th lens is provided with at least one point of inflexion; And an aperture, be arranged between object and described the 3rd lens; In the wherein said camera-lens system, described first lens and the distance of described second lens on optical axis are T12, and the focal length of whole camera-lens system is f, satisfies following relational expression: 0.5＜(T12/f) * 100＜15.
In the aforementioned camera-lens system of the present invention, the described positive refracting power of the first lens tool and its thing side surface are convex surface, can effectively shorten the optics total length of described camera-lens system; The described second lens tool is born refracting power, helps the aberration (Chromatic Aberration) of update the system; Described the 3rd lens tool is born refracting power, and Petzval and number (Petzval Sum) that can more effective update the system make peripheral image planes become more flat; The positive refracting power of described the 4th lens tool can effectively distribute the positive refracting power of described first lens, reducing the susceptibility of described camera-lens system, and its thing side surface and be respectively concave surface and convex surface as side surface, help the astigmatism of update the system; Described the 5th lens tool is born refracting power, can form one just with described the 4th lens, negative looking in the distance (Telephoto) structure, can effectively shorten the optics total length of described camera-lens system.
In the aforementioned camera-lens system of the present invention, described first lens and the distance of described second lens on optical axis are T12, and the focal length of whole camera-lens system is f, satisfies following relational expression: 0.5＜(T12/f) * 100＜15.When T12/f satisfies the above-mentioned relation formula, can prevent the excessive increase of astigmatism.
In the aforementioned camera-lens system of the present invention, preferably, described second lens be concave surface as side surface, with the back focal length of the described camera-lens system of effective increase, make to have enough spaces between described the 5th lens and the imaging surface and place other member.
Further, in the aforementioned camera-lens system of the present invention, preferably, described the 3rd lens thing side surface and be respectively convex surface and concave surface as side surface can help the higher order aberratons of update the system, with the elevator system image quality.
Further, in the aforementioned camera-lens system of the present invention, the abbe number of described first lens (AbbeNumber) is V1, and the abbe number of second lens is V2, preferably, satisfies following relational expression: V1-V2＞30, with effective correction aberration.
Further, in the aforementioned camera-lens system of the present invention, the focal length of whole camera-lens system is f, and the focal length of described first lens is f1, preferably, satisfies following relational expression: 1.0＜f/f1＜1.8.When f/f1 satisfies the above-mentioned relation formula, the refracting power size configure of first lens is balance comparatively, optics total length with effective shortening system, and can avoid high-order spherical aberration (High Order Spherical Aberration) excessively to increase simultaneously, and then lifting image quality, more preferably, satisfy following relational expression: 1.2＜f/f1＜1.6.
Further, in the aforementioned camera-lens system of the present invention, the focal length of described the 4th lens is f4, and the focal length of described the 5th lens is f5, preferably, satisfies following relational expression :-1.5＜f4/f5＜-0.5.When f4/f5 satisfies the above-mentioned relation formula, can effectively guarantee the structure of looking in the distance that the 4th lens and the 5th lens formed positive are negative, help to shorten the optics total length of system.
Further, in the aforementioned camera-lens system of the present invention, preferably, promising half moon-shaped lens satisfy following condition in described the 3rd lens, the 4th lens and described the 5th lens, wherein R
oBe the thing side surface radius-of-curvature of described crescent lens, R
iPicture side surface radius-of-curvature for described crescent lens: 0.5＜R
o/ R
i＜2.0, be unlikely to excessive with the refracting power of controlling described lens, can effectively reduce the susceptibility of system.
In the aforementioned camera-lens system of the present invention, the thing side surface radius-of-curvature of described first lens is R1, and the focal length of whole camera-lens system is f, preferably, satisfies following relational expression: 0.2＜R1/f＜0.4.When R1/f satisfies the above-mentioned relation formula, can effectively reduce the optics total length of camera-lens system, and can avoid higher order aberratons excessively to increase.
Further, in the aforementioned camera-lens system of the present invention, described aperture is arranged between object and described first lens, and helping in heart characteristic far away, the optics total length of whole camera-lens system can be shorter.
Further, in the aforementioned camera-lens system of the present invention, other is provided with a sense electronics optical element for the object imaging thereon, the thing side surface of described first lens to the distance of described sense electronics optical element on optical axis is TTL, and half of described sense electronics optical element effective pixel area diagonal angle line length is ImgH, preferably, satisfy following relational expression: TTL/ImgH＜2.0.When TTL/ImgH satisfies the above-mentioned relation formula, help keeping the miniaturization of camera-lens system, to be equipped on the frivolous portable electronic product.
In the camera-lens system of the present invention, the material of lens can be glass or plastic cement, if the material of lens is a glass, then can increase the degree of freedom of system's refracting power configuration, if the lens material is a plastic cement, then can effectively reduce production costs.In addition, aspheric surface can be set on minute surface, aspheric surface can be made into the shape beyond the sphere easily, obtain more controlled variable, in order to subduing aberration, and then the number that uses of reduction lens, therefore can effectively reduce the optics total length of camera-lens system of the present invention.
In the camera-lens system of the present invention,, represent that then described lens surface is a convex surface in paraxial place if lens surface is a convex surface; If lens surface is a concave surface, represent that then described lens surface is a concave surface in paraxial place.
Camera-lens system of the present invention will cooperate appended accompanying drawing to be described in detail by following specific embodiment.
First embodiment:
First embodiment of the invention sees also Fig. 1, and the aberration curve of first embodiment sees also Fig. 2.The camera-lens system of first embodiment mainly is made of five pieces of lens, is extremely comprised in regular turn as side by the thing side:
The 3rd lens 120 of the negative refracting power of one tool, its thing side surface 121 be that convex surface and picture side surface 122 are concave surface, and its material is a plastic cement, the thing side surface 121 of described the 3rd lens 120, are all aspheric surface as side surface 122;
The 4th lens 130 of the positive refracting power of one tool, its thing side surface 131 are that concave surface and picture side surface 132 are convex surface, and its material is a plastic cement, the thing side surface 131 of described the 4th lens 130, are all aspheric surface as side surface 132;
The 5th lens 140 of the negative refracting power of one tool, its thing side surface 141 is that convex surface and picture side surface 142 are concave surface, its material is a plastic cement, the thing side surface 141 of described the 5th lens 140, be all aspheric surface, and the thing side surface 141 of described the 5th lens 140, all be provided with at least one point of inflexion as side surface 142 as side surface 142; And
One aperture 150 places between an object and described first lens 100;
Other includes an infrared ray filtering optical filter (IR Filter) 160 and places looking like between side surface 142 and the imaging surface 170 of described the 5th lens 140; Described infrared ray filtering optical filter 160 does not influence the focal length of the aforementioned camera-lens system of the present invention.
The equation of above-mentioned aspheric curve is expressed as follows:
Wherein:
X: be the point of Y apart from optical axis on the aspheric surface, itself and the relative height that is tangential on the tangent plane on summit on the aspheric surface optical axis;
Y: the point on the aspheric curve and the distance of optical axis;
K: conical surface coefficient;
Ai: i rank asphericity coefficient.
In the first embodiment camera-lens system, the focal length of whole camera-lens system is f, and its relational expression is: f=5.44.
In the first embodiment camera-lens system, the f-number of whole camera-lens system (f-number) is Fno, and its relational expression is: Fno=2.9.
In the first embodiment camera-lens system, the half angle of view of whole camera-lens system is HFOV, and its relational expression is: the HFOV=33.0 degree.
In the first embodiment camera-lens system, described first lens 100 are T12 with the distance of described second lens 110 on optical axis, and the focal length of whole camera-lens system is f, and its relational expression is: (T12/f) * and 100=1.29.
In the first embodiment camera-lens system, the abbe number of described first lens 100 is V1, and the abbe number of described second lens 110 is V2, and its relational expression is: V1-V2=32.5.
In the first embodiment camera-lens system, the focal length of whole camera-lens system is f, and the focal length of first lens 100 is f1, and its relational expression is: f/f1=1.41.
In the first embodiment camera-lens system, the focal length of the 4th lens 130 is f4, and the focal length of the 5th lens 140 is f5, and its relational expression is: f4/f5=-0.79.
In the first embodiment camera-lens system, wherein said the 3rd lens 120, the 4th lens 130, the 5th lens 140 all are crescent lens, R
oBe the thing side surface radius-of-curvature of described crescent lens, R
iBe the picture side surface radius-of-curvature of described crescent lens, its relational expression is:
R
o/ R
i=1.09 (the 3rd lens 120);
R
o/ R
i=1.27 (the 4th lens 130); And
R
o/ R
i=1.73 (the 5th lens 140).
In the first embodiment camera-lens system, thing side surface 101 radius-of-curvature of described first lens 100 are R1, and the focal length of whole camera-lens system is f, and its relational expression is: R1/f=0.28.
In the first embodiment camera-lens system, described camera-lens system is provided with a sense electronics optical element in described imaging surface 170 places for the object imaging thereon in addition, the thing side surface 101 of described first lens 100 to the distance of described sense electronics optical element on optical axis is TTL, and half of described sense electronics optical element effective pixel area diagonal angle line length is ImgH, and its relational expression is:
TTL/ImgH＝1.66。
In the first embodiment camera-lens system, described second lens 110 be R4 as side surface 112 radius-of-curvature, the focal length of whole camera-lens system is f, its relational expression is: R4/f=0.93.
In the first embodiment camera-lens system, the abbe number of described second lens 110 is V2, and the abbe number of described the 3rd lens 120 is V3, and its relational expression is: | V2-V3|=32.5.
The detailed optical data of first embodiment is shown in Fig. 7 table one, and its aspherical surface data is shown in Fig. 8 table two, and wherein the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as half of maximum visual angle.
Second embodiment:
Second embodiment of the invention sees also Fig. 3, and the aberration curve of second embodiment sees also Fig. 4.The camera-lens system of second embodiment mainly is made of five pieces of lens, is extremely comprised in regular turn as side by the thing side:
The 3rd lens 320 of the positive refracting power of one tool, its thing side surface 321 are that convex surface and picture side surface 322 are concave surface, and its material is a plastic cement, the thing side surface 321 of described the 3rd lens 320, are all aspheric surface as side surface 322;
The 4th lens 330 of the positive refracting power of one tool, its thing side surface 331 are that concave surface and picture side surface 332 are convex surface, and its material is a plastic cement, the thing side surface 331 of described the 4th lens 330, are all aspheric surface as side surface 332;
The 5th lens 340 of the negative refracting power of one tool, its thing side surface 341 is that convex surface and picture side surface 342 are concave surface, its material is a plastic cement, the thing side surface 341 of described the 5th lens 340, be all aspheric surface as side surface 342, and the thing side surface 341 of described the 5th lens 340 and all be provided with at least one point of inflexion as side surface 342; And
One aperture 350 places between an object and described first lens 300;
Other includes an infrared ray filtering optical filter (IR Filter) 360 and places looking like between side surface 342 and the imaging surface 370 of described the 5th lens 340; Described infrared ray filtering optical filter 360 does not influence the focal length of the aforementioned camera-lens system of the present invention.
The equational expression of the second embodiment aspheric curve is as the pattern of first embodiment.
In the second embodiment camera-lens system, the focal length of whole camera-lens system is f, and its relational expression is: f=5.46.
In the second embodiment camera-lens system, the f-number of whole camera-lens system is Fno, and its relational expression is: Fno=2.9.
In the second embodiment camera-lens system, the half angle of view of whole camera-lens system is HFOV, and its relational expression is: the HFOV=33.0 degree.
In the second embodiment camera-lens system, described first lens 300 are T12 with the distance of described second lens 310 on optical axis, and the focal length of whole camera-lens system is f, and its relational expression is: (T12/f) * and 100=1.28.
In the second embodiment camera-lens system, the abbe number of described first lens 300 is V1, and the abbe number of described second lens 310 is V2, and its relational expression is: V1-V2=32.5.
In the second embodiment camera-lens system, the focal length of whole camera-lens system is f, and the focal length of first lens 300 is f1, and its relational expression is: f/f1=1.42.
In the second embodiment camera-lens system, the focal length of the 4th lens 330 is f4, and the focal length of the 5th lens 340 is f5, and its relational expression is: f4/f5=-0.91.
In the second embodiment camera-lens system, wherein said the 3rd lens 320, the 4th lens 330, the 5th lens 340 all are crescent lens, R
oBe the thing side surface radius-of-curvature of described crescent lens, R
iBe the picture side surface radius-of-curvature of described crescent lens, its relational expression is:
R
o/ R
i=0.97 (the 3rd lens 320);
R
o/ R
i=1.05 (the 4th lens 330); And
R
o/ R
i=1.48 (the 5th lens 340).
In the second embodiment camera-lens system, thing side surface 301 radius-of-curvature of described first lens 300 are R1, and the focal length of whole camera-lens system is f, and its relational expression is: R1/f=0.30.
In the second embodiment camera-lens system, described camera-lens system is provided with a sense electronics optical element in described imaging surface 370 places for the object imaging thereon in addition, the thing side surface 301 of described first lens 300 to the distance of described sense electronics optical element on optical axis is TTL, and half of described sense electronics optical element effective pixel area diagonal angle line length is ImgH, and its relational expression is:
TTL/ImgH＝1.66。
In the second embodiment camera-lens system, described second lens 310 be R4 as side surface 312 radius-of-curvature, the focal length of whole camera-lens system is f, its relational expression is: R4/f=0.83.
In the second embodiment camera-lens system, the abbe number of described second lens 310 is V2, and the abbe number of described the 3rd lens 320 is V3, and its relational expression is: | V2-V3|=0.0.
The detailed optical data of second embodiment is shown in Fig. 9 table three, and its aspherical surface data is shown in Figure 10 table four, and wherein the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as half of maximum visual angle.
The 3rd embodiment:
Third embodiment of the invention sees also Fig. 5, and the aberration curve of the 3rd embodiment sees also Fig. 6.The camera-lens system of the 3rd embodiment mainly is made of five pieces of lens, is extremely comprised in regular turn as side by the thing side:
First lens 500 of the positive refracting power of one tool, its thing side surface 501 are that convex surface and picture side surface 502 are concave surface, and its material is a plastic cement, the thing side surface 501 of described first lens 500, are all aspheric surface as side surface 502;
Second lens 510 of the negative refracting power of one tool, its thing side surface 511 be that convex surface and picture side surface 512 are concave surface, and its material is a plastic cement, the thing side surface 511 of described second lens 510, are all aspheric surface as side surface 512;
The 3rd lens 520 of the positive refracting power of one tool, its thing side surface 521 are that convex surface and picture side surface 522 are concave surface, and its material is a plastic cement, the thing side surface 521 of described the 3rd lens 520, are all aspheric surface as side surface 522;
The 4th lens 530 of the positive refracting power of one tool, its thing side surface 531 are that concave surface and picture side surface 532 are convex surface, and its material is a plastic cement, the thing side surface 531 of described the 4th lens 530, are all aspheric surface as side surface 532;
The 5th lens 540 of the negative refracting power of one tool, its thing side surface 541 is that convex surface and picture side surface 542 are concave surface, its material is a plastic cement, the thing side surface 541 of described the 5th lens 540, be all aspheric surface as side surface 542, and the thing side surface 541 of described the 5th lens 540 and all be provided with at least one point of inflexion as side surface 542; And
One aperture 550 places between an object and described first lens 500;
Other includes an infrared ray filtering optical filter (IR Filter) 560 and places looking like between side surface 542 and the imaging surface 570 of described the 5th lens 540; Described infrared ray filtering optical filter 560 does not influence the focal length of the aforementioned camera-lens system of the present invention.
The equational expression of the 3rd embodiment aspheric curve is as the pattern of first embodiment.
In the 3rd embodiment camera-lens system, the focal length of whole camera-lens system is f, and its relational expression is: f=5.47.
In the 3rd embodiment camera-lens system, the f-number of whole camera-lens system is Fno, and its relational expression is: Fno=2.9.
In the 3rd embodiment camera-lens system, the half angle of view of whole camera-lens system is HFOV, and its relational expression is: the HFOV=33.0 degree.
In the 3rd embodiment camera-lens system, described first lens 500 are T12 with the distance of described second lens 510 on optical axis, and the focal length of whole camera-lens system is f, and its relational expression is: (T12/f) * and 100=0.91.
In the 3rd embodiment camera-lens system, the abbe number of described first lens 500 is V1, and the abbe number of described second lens 510 is V2, and its relational expression is: V1-V2=32.5.
In the 3rd embodiment camera-lens system, the focal length of whole camera-lens system is f, and the focal length of first lens 500 is f1, and its relational expression is: f/f1=1.45.
In the 3rd embodiment camera-lens system, the focal length of the 4th lens 530 is f4, and the focal length of the 5th lens 540 is f5, and its relational expression is: f4/f5=-0.85.
In the 3rd embodiment camera-lens system, wherein said the 3rd lens 520, the 4th lens 530, the 5th lens 540 all are crescent lens, R
oBe the thing side surface radius-of-curvature of described crescent lens, R
iBe the picture side surface radius-of-curvature of described crescent lens, its relational expression is:
R
o/ R
i=0.98 (the 3rd lens 520);
R
o/ R
i=1.05 (the 4th lens 530); And
R
o/ R
i=1.42 (the 5th lens 540).
In the 3rd embodiment camera-lens system, thing side surface 501 radius-of-curvature of described first lens 500 are R1, and the focal length of whole camera-lens system is f, and its relational expression is: R1/f=0.29.
In the 3rd embodiment camera-lens system, described camera-lens system is provided with a sense electronics optical element in described imaging surface 570 places for the object imaging thereon in addition, the thing side surface 501 of described first lens 500 to the distance of sense electronics optical element on optical axis is TTL, and half of described sense electronics optical element effective pixel area diagonal angle line length is ImgH, and its relational expression is:
TTL/ImgH＝1.66。
In the 3rd embodiment camera-lens system, described second lens 510 be R4 as side surface 512 radius-of-curvature, the focal length of whole camera-lens system is f, its relational expression is: R4/f=0.79.
In the 3rd embodiment camera-lens system, the abbe number of described second lens 510 is V2, and the abbe number of described the 3rd lens 520 is V3, and its relational expression is: | V2-V3|=0.0.
The detailed optical data of the 3rd embodiment is shown in Figure 11 table five, and its aspherical surface data is shown in Figure 12 table six, and wherein the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as half of maximum visual angle.
Table one is depicted as the different numerical value change tables of camera-lens system embodiment of the present invention to table six (corresponding diagram 7 is to Figure 12 respectively); the all true gained of testing of numerical value change of right each embodiment of the present invention; even use different numerical value; the product of same structure must belong to protection category of the present invention; so above explanation is illustrated only as exemplary, non-in order to limit claim of the present invention in describing and illustrating.Table seven (corresponding Figure 13) is the numeric data of the corresponding correlationship formula of the present invention of each embodiment.
Claims (28)
1. a camera-lens system is characterized in that, described camera-lens system is extremely comprised as side in regular turn by the thing side:
First lens of the positive refracting power of one tool, its thing side surface is a convex surface;
Second lens of the negative refracting power of one tool;
One the 3rd lens, it is a concave surface as side surface;
The 4th lens of the positive refracting power of one tool;
The 5th lens of the negative refracting power of one tool, it is a concave surface as side surface, and at least one surface of described the 5th lens is provided with at least one point of inflexion; And
One aperture is arranged between object and described the 3rd lens;
Wherein, in the described camera-lens system, described first lens and the distance of described second lens on optical axis are T12, and the focal length of whole camera-lens system is f, satisfies following relational expression:
0.5＜(T12/f)×100＜15。
2. camera-lens system as claimed in claim 1 is characterized in that, described second lens be concave surface as side surface.
3. camera-lens system as claimed in claim 2 is characterized in that, the thing side surface of described the 3rd lens is a convex surface, the thing side surface of described the 4th lens and be respectively concave surface and convex surface as side surface.
4. camera-lens system as claimed in claim 3 is characterized in that, the positive refracting power of described the 3rd lens tool.
5. camera-lens system as claimed in claim 2 is characterized in that, the abbe number of described first lens is V1, and the abbe number of described second lens is V2, satisfies following relational expression:
V1-V2＞20。
6. camera-lens system as claimed in claim 5 is characterized in that, the abbe number of described first lens is V1, and the abbe number of described second lens is V2, satisfies following relational expression:
V1-V2＞30。
7. camera-lens system as claimed in claim 2 is characterized in that, the focal length of whole camera-lens system is f, and the focal length of described first lens is f1, satisfies following relational expression:
1.0＜f/f1＜1.8。
8. camera-lens system as claimed in claim 7 is characterized in that, the focal length of whole camera-lens system is f, and the focal length of described first lens is f1, satisfies following relational expression:
1.2＜f/f1＜1.6。
9. camera-lens system as claimed in claim 2 is characterized in that, the lens of tool refracting power only have described first lens, second lens, the 3rd lens, the 4th lens and described the 5th lens in the described camera-lens system.
10. camera-lens system as claimed in claim 9 is characterized in that, the focal length of described the 4th lens is f4, and the focal length of described the 5th lens is f5, satisfies following relational expression:
-1.5＜f4/f5＜-0.5。
11. camera-lens system as claimed in claim 9 is characterized in that, promising half moon-shaped lens satisfy following condition, R in described the 3rd lens, the 4th lens and described the 5th lens
oBe the thing side surface radius-of-curvature of described crescent lens, R
iPicture side surface radius-of-curvature for described crescent lens:
0.5＜R
o/R
i＜2.0。
12. camera-lens system as claimed in claim 1 is characterized in that, the thing side surface radius-of-curvature of described first lens is R1, and the focal length of whole camera-lens system is f, satisfies following relational expression:
0.2＜R1/f＜0.4。
13. camera-lens system as claimed in claim 2 is characterized in that, described aperture is arranged between object and described first lens.
14. camera-lens system as claimed in claim 9, it is characterized in that, described camera-lens system is provided with a sense electronics optical element for the object imaging thereon in addition, the thing side surface of described first lens to the distance of described sense electronics optical element on optical axis is TTL, and half of described sense electronics optical element effective pixel area diagonal angle line length is ImgH, satisfies following relational expression:
TTL/ImgH＜2.0。
15. camera-lens system as claimed in claim 2 is characterized in that, described second lens be R4 as the side surface radius-of-curvature, the focal length of whole camera-lens system is f, satisfies following relational expression:
0.7＜R4/f＜1.2。
16. camera-lens system as claimed in claim 1 is characterized in that, the abbe number of described second lens is V2, and the abbe number of described the 3rd lens is V3, satisfies following relational expression:
|V2-V3|＜15。
17. a camera-lens system is characterized in that, described camera-lens system is extremely comprised as side in regular turn by the thing side:
First lens of the positive refracting power of one tool, its thing side surface is a convex surface;
Second lens of the negative refracting power of one tool;
The 3rd lens of the negative refracting power of one tool;
The 4th lens of the positive refracting power of one tool, its thing side surface and be respectively concave surface and convex surface as side surface;
The 5th lens of the negative refracting power of one tool, it is a concave surface as side surface, and at least one surface of described the 5th lens is provided with at least one point of inflexion; And
One aperture is arranged between object and described the 3rd lens;
In the wherein said camera-lens system, described first lens and the distance of described second lens on optical axis are T12, and the focal length of whole camera-lens system is f, satisfies following relational expression:
0.5＜(T12/f)×100＜15。
18. camera-lens system as claimed in claim 17 is characterized in that, described second lens be concave surface as side surface.
19. camera-lens system as claimed in claim 18 is characterized in that, the thing side surface of described the 3rd lens and be respectively convex surface and concave surface as side surface.
20. camera-lens system as claimed in claim 18 is characterized in that, the abbe number of described first lens is V1, and the abbe number of described second lens is V2, satisfies following relational expression:
V1-V2＞30。
21. camera-lens system as claimed in claim 18 is characterized in that, the focal length of whole camera-lens system is f, and the focal length of described first lens is f1, satisfies following relational expression:
1.0＜f/f1＜1.8。
22. camera-lens system as claimed in claim 21 is characterized in that, the focal length of whole camera-lens system is f, and the focal length of described first lens is f1, satisfies following relational expression:
1.2＜f/f1＜1.6。
23. camera-lens system as claimed in claim 18 is characterized in that, the lens of tool refracting power only have described first lens, second lens, the 3rd lens, the 4th lens and described the 5th lens in the described camera-lens system.
24. camera-lens system as claimed in claim 23 is characterized in that, the focal length of described the 4th lens is f4, and the focal length of described the 5th lens is f5, satisfies following relational expression:
-1.5＜f4/f5＜-0.5。
25. camera-lens system as claimed in claim 23 is characterized in that, promising half moon-shaped lens satisfy following condition, R in described the 3rd lens, the 4th lens and described the 5th lens
oBe the thing side surface radius-of-curvature of described crescent lens, Ri is the picture side surface radius-of-curvature of described crescent lens:
0.5＜R
o/R
i＜2.0。
26. camera-lens system as claimed in claim 17 is characterized in that, the thing side surface radius-of-curvature of described first lens is R1, and the focal length of whole camera-lens system is f, satisfies following relational expression:
0.2＜R1/f＜0.4。
27. camera-lens system as claimed in claim 18 is characterized in that, described aperture is arranged between object and described first lens.
28. camera-lens system as claimed in claim 23, it is characterized in that, described camera-lens system is provided with a sense electronics optical element for the object imaging thereon in addition, the thing side surface of described first lens to the distance of sense electronics optical element on optical axis is TTL, and half of described sense electronics optical element effective pixel area diagonal angle line length is ImgH, satisfies following relational expression:
TTL/ImgH＜2.0。
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| CN2009101680711A CN101995641B (en) | 2009-08-24 | 2009-08-24 | Photographic lens system |
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| CN101995641B CN101995641B (en) | 2012-05-30 |
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