CN101782676B - Imaging optical lens group - Google Patents
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- CN101782676B CN101782676B CN2009100033339A CN200910003333A CN101782676B CN 101782676 B CN101782676 B CN 101782676B CN 2009100033339 A CN2009100033339 A CN 2009100033339A CN 200910003333 A CN200910003333 A CN 200910003333A CN 101782676 B CN101782676 B CN 101782676B
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Abstract
The invention discloses an imaging optical lens group, which comprises the following components from the object side to the image side: a first lens with positive refracting power, a second lens with negative refracting power, a third lens with positive refracting power, a fourth lens with positive refracting power, a fifth lens, and an aperture. The front surface of the first lens is a convex surface; and the front surface of the third lens is a concave surface and the rear surface of the third lens is a convex surface. The aperture is arranged between an object to be photographed and the second lens. The number of the lenses with the refracting power is only five in the imaging optical lens group. Due to the lens structure and the arrangement mode, the volume of the lens group can be effectively reduced; the sensitivity of an optical system is reduced; and higher image resolution can be acquired simultaneously.
Description
Technical field
The present invention relates to a kind of imaging optical lens group, particularly relate to a kind of miniaturization imaging optical lens group that is applied to camera cell phone.
Background technology
Recent years, along with the rise of camera cell phone, 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 complementary matal-oxide semiconductor (Complementary Metal-Oxide Semiconductor, CMOS) two kinds, and because the manufacture of semiconductor development of technology; Make the picture element area of photo-sensitive cell dwindle, the miniaturization phtographic lens is the development toward high picture element field gradually.
The high resolution mobile lens of commonly seeing, it is main adopting the four-piece type lens arrangement more, (authorizes day: on April 29th, 2008) like U.S. patent of invention instructions US7365920B2; But because the picture element of camera cell phone is soaring quite rapid, when the picture element area of photo-sensitive cell dwindles gradually, and under system's situation that the requirement of image quality is constantly improved, the four-piece type lens combination of commonly seeing can't satisfy more that the phtographic lens module of high-order uses; In order to reach the image quality of higher picture element and performance, then need increase the number of lens, but too much eyeglass number causes easily the optics total length of camera lens to increase, and is difficult to have concurrently the characteristic of miniaturization.
Summary of the invention
Technical matters to be solved by this invention provides a kind of imaging optical lens group, and it can reach required high picture element in market and high performance image quality, and the optics total length of effective controls lens, and the characteristic that has miniaturization concurrently.
For solving the problems of the technologies described above, the present invention provides a kind of imaging optical lens group that is made up of five lens, and its main idea is following:
A kind of imaging optical lens group is extremely comprised as side by the thing side in regular turn: first lens of the positive refracting power of a tool, and the first lens front surface is a convex surface; Second lens of the negative refracting power of one tool; The 3rd lens of the positive refracting power of one tool, its front surface are concave surface, and the surface, back is a convex surface; The 4th lens of the positive refracting power of one tool; And one the 5th lens; One aperture, it places between the object and second lens; In the imaging optical lens group, the number of lenses of tool refracting power is merely five; The focal length of whole imaging optical lens group is f, and the focal length of first lens is f1, and its relation is: 1.1＜f/f1＜2.0; It is characterized in that: the focal length of said the 4th lens is f4, and the focal length of the 5th lens is f5, and its relation is: 0＜f/f4＜0.8;-2.0＜f/f5＜-0.75.By above-mentioned configuration, the effective image quality of elevator system, and have the characteristic of miniaturization concurrently.
The refracting power of imaging optical lens group of the present invention mainly is that first lens by the positive refracting power of tool provide; Its function of second lens of the negative refracting power of tool is mainly the aberration of update the system; Its function of the 3rd lens of the positive refracting power of tool is the required refracting power of distribution system, the susceptibility of system is reduced, and the effect of the 4th lens and the 5th lens is as the revisal lens; Its function is balance and each item aberration that update the system produced, the effectively image quality of elevator system.
By first lens powerful positive refracting power is provided, and aperture is placed the object side near the imaging optical lens group, can effectively shorten the optics total length of imaging optical lens group; In addition; Above-mentioned configuration can make the outgoing pupil (ExitPupil) of imaging optical lens group away from imaging surface, and therefore, light will be incident on the mode near vertical incidence on the photo-sensitive cell; This is the heart far away (Telecentric) characteristic of imaging side; Heart characteristic far away is very important for the photoperceptivity of solid-state electronic photo-sensitive cell at present, and with making the sensitization susceptibility of sense electronics optical element improve, the minimizing system produces the possibility at dark angle.In addition, the 4th lens and the 5th lens are provided with the point of inflexion, with the angle of more effectively suppressing on the light incident photo-sensitive cell of axle visual field.
In addition, in wide-angle optics, need do correction to distorting (Distortion) and multiplying power look receipts poor (ChromaticAberration of Magnification) especially, its method is for to place system light flexion equilibrium of forces place with aperture.The present invention then focuses on the characteristic of the heart far away if aperture is placed before first lens, and the optics total length of system can be shorter; If aperture is placed between first lens and second lens, then focus on the characteristic of Wide-angle, simultaneously, so configuration of aperture position also can effectively reduce the susceptibility of system.
Along with the trend of lens of photographic mobile phone miniaturization, and system need contain visual angle widely, makes the focal length of optical system become very short; In this case, it is very little that the radius-of-curvature of eyeglass and lens dimension all become, and will be difficult to produce above-mentioned eyeglass with the traditional glass abrasive method; Therefore; On eyeglass, adopt plastic cement material, make eyeglass, can use eyeglass than less cost production high precision by the mode of ejection formation; And aspheric surface is set on minute surface, aspheric surface can be made into the shape beyond the sphere easily, obtains more controlled variable, in order to subduing aberration, and then the number of reduction eyeglass use, can effectively shorten the optics total length of imaging optical lens group by this.
In the imaging optical lens group of the present invention, first focal length of lens is f1, and the focal length of whole imaging optical lens group is f, and its relation is:
1.1＜f/f1＜2.0；
When f/f1 satisfies the above-mentioned relation formula; The refracting power size configure of first lens is balance comparatively; Can be than the optics total length of effective control system; Keep the target of miniaturization, and can avoid the excessive increase of high-order spherical aberration (High Order SphericalAberration) and coma (Coma) simultaneously, promote image quality; Further, it is then comparatively desirable to satisfy following relational expression:
1.1＜f/f1＜1.4。
In the imaging optical lens group of the present invention, second focal length of lens is f2, and the focal length of whole imaging optical lens group is f, and its relation is:
-2.5＜f/f2＜-0.7；
When f/f2 satisfied the above-mentioned relation formula, the multiplying power look receipts difference that can help update the system was poor with the image planes receipts.
In the imaging optical lens group of the present invention, the 3rd focal length of lens is f3, and the focal length of whole imaging optical lens group is f, and both satisfy following relational expression:
0.6＜f/f3＜0.8；
The positive refracting power of the 3rd lens tool, therefore its function is worked as f/f3 and is satisfied the above-mentioned relation formula for distributing the required refracting power of imaging optical lens group, and the refracting power of its system disposes comparatively balance, can make the susceptibility of system lower.
In the imaging optical lens group of the present invention, the 4th focal length of lens is f4, and the 5th focal length of lens is f5, and the focal length of whole imaging optical lens group is f, and both satisfy following relational expression:
0＜f/f4＜0.8；
-2.0＜f/f5＜-0.75；
When f/f4 and f/f5 satisfy the above-mentioned relation formula; The 4th lens and the 5th lensing are as the revisal lens; Its function is balance and each item aberration that update the system produced; Can help revising the astigmatism (Astigmatism) of imaging optical lens group and distort (Distortion), improve the resolving power of imaging optical lens group; Further, it is then comparatively desirable that f/f4 satisfies following relation:
0.0＜f/f4＜0.3；
Further, to satisfy following relational expression then even more ideal for f/f4:
0.03＜f/f4＜0.2。
In the imaging optical lens group of the present invention, the first lens front surface radius-of-curvature is R1, and the surface curvature radius is R2 behind first lens, and its relational expression is:
R1/R2＞-0.22；
When R1/R2 satisfies the above-mentioned relation formula, can help the correction of spherical aberration in the imaging optical lens group; Further, it is then comparatively desirable to make R1/R2 satisfy following relation:
-0.2＜R1/R2＜0.3。
In the imaging optical lens group of the present invention, the 4th lens front surface radius-of-curvature is R7, and the surface curvature radius is R8 behind the 4th lens, and the 5th lens front surface radius-of-curvature is R9, and the surface curvature radius is R10 behind the 5th lens, and its relational expression is:
0＜R7/R8＜1.6；
2.0＜R9/R10＜4.0；
Satisfy the above-mentioned relation formula, can make the 4th lens and the 5th lensing such as revisal lens, help the higher order aberratons of update the system, promote image quality.
In the imaging optical lens group of the present invention, the abbe number of first lens (Abbe Number) is V1, and the abbe number of second lens is V2, and the abbe number of the 3rd lens is V3, and the abbe number of the 4th lens is V4, and its relation is:
50＜V1＜58；
40＜V4＜70；
V1-V2＞15；
V3-V2＞15；
When V1, V2, V3 and V4 satisfy above-mentioned relation, can help revising the aberration (ChromaticAberration) of imaging optical lens group, improve the resolving power of imaging optical lens group.
In the imaging optical lens group of the present invention, the abbe number of the 4th lens (Abbe Number) is V4, and the abbe number of the 5th lens is V5, and its relation is:
|V4-V5|＜15；
When V4 and V5 satisfy above-mentioned relation, help system's correction astigmatism.
In the imaging optical lens group of the present invention, the peripheral thickness ET4 of the 4th lens, the center thickness CT4 of the 4th lens, its relation is:
0.6＜ET4/CT4＜1.0；
Peripheral thickness be defined as between lens front surface and surperficial effective diameter position, back apart from the length of projection on optical axis; Satisfy above-mentioned relation and can make the plastic rubber ejaculate molding eyeglass have good mouldability and material homogenieity, help keeping the image quality and stability of imaging optical lens group.
In the imaging optical lens group of the present invention, the mirror spacing T12 of first lens and second lens, the focal length of whole imaging optical lens group are f, and its relation is:
0.4＜(T12/f)*100＜15；
Satisfy the ability that the above-mentioned relation formula can more effectively improve imaging optical lens group correction astigmatism.
In the imaging optical lens group of the present invention; Other is provided with a sense electronics optical element and supplies the object imaging; The optics total length of imaging optical lens group is TTL; This TTL is the distance of first lens front surface to the imaging surface on optical axis in the imaging optical lens group, and the maximum imaging of imaging optical lens group highly is ImgH, and its relation is:
TTL/ImgH＜2.05；
When TTL/ImgH satisfies the characteristic that above-mentioned relation can be kept the miniaturization of imaging optical lens group.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Figure 1A is a first embodiment of the invention optical system synoptic diagram;
Figure 1B is the aberration curve figure of first embodiment of the invention;
Fig. 2 A is a second embodiment of the invention optical system synoptic diagram;
Fig. 2 B is the aberration curve figure of second embodiment of the invention;
Fig. 3 A is a third embodiment of the invention optical system synoptic diagram;
Fig. 3 B is the aberration curve figure of third embodiment of the invention;
Fig. 4 A is a fourth embodiment of the invention optical system synoptic diagram;
Fig. 4 B is the aberration curve figure of fourth embodiment of the invention.
Reference numeral is among the figure: 10-first lens; The 11-front surface; Surface behind the 12-; 20-second lens; The 21-front surface; Surface behind the 22-; 30-the 3rd lens; The 31-front surface; Surface behind the 32-; 40-the 4th lens; The 41-front surface; Surface behind the 42-; 50-the 5th lens; The 51-front surface; Surface behind the 52-; The 60-aperture; 70-infrared ray filtering optical filter; The 80-imaging surface; The focal length of the whole imaging optical lens group of f-; The focal length of f1-first lens; The focal length of f2-second lens; The focal length of f3-the 3rd lens; The focal length of f4-the 4th lens; The focal length of f5-the 5th lens; Mirror spacing between T12-first lens and second lens; The V1-first lens abbe number; The V2-second lens abbe number; V3-the 3rd lens abbe number; V4-the 4th lens abbe number; V5-the 5th lens abbe number; The front surface radius-of-curvature of R1-first lens; The back surface curvature radius of R2-first lens; The front surface radius-of-curvature of R7-the 4th lens; The back surface curvature radius of R8-the 4th lens; The front surface radius-of-curvature of R9-the 5th lens; The back surface curvature radius of R10-the 5th lens; The peripheral thickness of ET4-the 4th lens; The center thickness of CT4-the 4th lens; The optics total length of TTL-imaging optical lens group; The maximum imaging height of ImgH-imaging optical lens group.
Embodiment
First embodiment of the invention sees also Figure 1A, and the aberration curve of first embodiment sees also Figure 1B, and first embodiment is extremely comprised as side by the thing side in regular turn:
The 3rd lens 30 of the positive refracting power of one tool, its material is a plastic cement, and the front surface 31 of the 3rd lens 30 is a concave surface, and surface, back 32 is a convex surface, and the front surface 31 of the 3rd lens 30 all is set to aspheric surface with surface, back 32 in addition;
The 4th lens 40 of the positive refracting power of one tool; Its material is a plastic cement, and the front surface 41 of the 4th lens 40 is a convex surface, and surface, back 42 is a concave surface; The front surface 41 of the 4th lens 40 all is set to aspheric surface with surface, back 42 in addition, and the front surface 41 of the 4th lens 40 all is provided with the point of inflexion with surface, back 42;
The 5th lens 50 of the negative refracting power of one tool; Its material is a plastic cement, and the front surface 51 of the 5th lens 50 is a convex surface, and surface, back 52 is a concave surface; The front surface 51 of the 5th lens 50 all is set to aspheric surface with surface, back 52 in addition, and the front surface 51 of the 5th lens 50 all is provided with the point of inflexion with surface, back 52;
One aperture 60 places before first lens 10;
One infrared ray filtering optical filter (IR Filter) 70 places after the 5th lens 50, and it does not influence the focal length of system;
One imaging surface 80 places after the infrared ray filtering optical filter 70.
The equation of above-mentioned aspheric curve is represented as follows:
Wherein:
X: be the point of Y apart from optical axis on the aspheric surface, its be tangential on aspheric surface light
The relative height of the tangent plane on summit on the axle;
Y: the point on the aspheric curve and the distance of optical axis;
K: conical surface coefficient;
Ai: i rank asphericity coefficient.
Among first embodiment, the focal length of whole imaging optical lens group is f, and the focal length of first lens is f1, and the focal length of second lens is f2, and the focal length of the 3rd lens is f3, and the focal length of the 4th lens is f4, and the focal length of the 5th lens is f5, and its relation is:
f＝6.17mm；
f/f1＝1.35；
f/f2＝-0.89；
f/f3＝0.50；
f/f4＝0.50；
f/f5＝-1.06。
Among first embodiment, the focal length of whole imaging optical lens group is f, and the mirror spacing between first lens and second lens is T12, and its relation is: (T12/f) * 100=3.8.
Among first embodiment, the first lens abbe number (Abbe Number) is V1, and the second lens abbe number is V2, and the 3rd lens abbe number is V3, and the 4th lens abbe number is V4, and the 5th lens abbe number is V5, and its relation is:
V1＝55.9；
V4＝55.9；
V1-V2＝32.5；
V3-V2＝32.5；
|V4-V5|＝0.0。
Among first embodiment; The front surface radius-of-curvature of first lens is R1, and the back surface curvature radius of first lens is R2, and the front surface radius-of-curvature of the 4th lens is R7; The back surface curvature radius of the 4th lens is R8; The front surface radius-of-curvature of the 5th lens is R9, and the back surface curvature radius of the 5th lens is R10, and its relation is:
R1/R2＝0.05；
R7/R8＝0.06；
R9/R10＝2.15。
Among first embodiment, the peripheral thickness of the 4th lens is ET4, and the center thickness of the 4th lens is CT4, and its relation is: ET4/CT4=1.34.
Among first embodiment, the imaging optical lens group is provided with a sense electronics optical element in addition and supplies the object imaging, and the optics total length of imaging optical lens group is TTL, and the maximum imaging of imaging optical lens group highly is ImgH, and its relation is: TTL/ImgH=1.83.
The detailed structured data of first embodiment is as shown in the table 1, and its aspherical surface data is as shown in the table 2, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as the half the of maximum visual angle.
Table 1: first embodiment of the invention structured data
Table 2: first embodiment of the invention aspherical surface data
Second embodiment of the invention sees also Fig. 2 A, and the aberration curve of second embodiment sees also Fig. 2 B, and second embodiment is extremely comprised as side by the thing side in regular turn:
The 3rd lens 30 of the positive refracting power of one tool, its material is a plastic cement, and the front surface 31 of the 3rd lens 30 is a concave surface, and surface, back 32 is a convex surface, and the front surface 31 of the 3rd lens 30 all is set to aspheric surface with surface, back 32 in addition;
The 4th lens 40 of the positive refracting power of one tool; Its material is a plastic cement, and the front surface 41 of the 4th lens 40 is a convex surface, and surface, back 42 is a concave surface; The front surface 41 of the 4th lens 40 all is set to aspheric surface with surface, back 42 in addition, and the front surface 41 of the 4th lens 40 all is provided with the point of inflexion with surface, back 42;
The 5th lens 50 of the negative refracting power of one tool; Its material is a plastic cement, and the front surface 51 of the 5th lens 50 is a convex surface, and surface, back 52 is a concave surface; The front surface 51 of the 5th lens 50 all is made as aspheric surface with surface, back 52 in addition, and the front surface 51 of the 5th lens 50 all is provided with the point of inflexion with surface, back 52;
One aperture 60 places before first lens 10;
One infrared ray filtering optical filter (IR Filter) 70 places after the 5th lens 50, and it does not influence the focal length of system;
One imaging surface 80 places after the infrared ray filtering optical filter 70.
The equational expression of the second embodiment aspheric curve is as the pattern of first embodiment.
Among second embodiment, the focal length of whole imaging optical lens group is f, and the focal length of first lens is f1, and the focal length of second lens is f2, and the focal length of the 3rd lens is f3, and the focal length of the 4th lens is f4, and the focal length of the 5th lens is f5, and its relation is:
f＝6.10mm；
f/f1＝1.40；
f/f2＝-0.94；
f/f3＝0.50；
f/f4＝0.50；
f/f5＝-1.05。
Among second embodiment, the focal length of whole imaging optical lens group is f, and the mirror spacing between first lens and second lens is T12, and its relation is: (T12/f) * 100=3.9.
Among second embodiment, the first lens abbe number (Abbe Number) is V1, and the second lens abbe number is V2, and the 3rd lens abbe number is V3, and the 4th lens abbe number is V4, and the 5th lens abbe number is V5, and its relation is:
V1＝55.9；
V4＝55.9；
V1-V2＝32.5；
V3-V2＝32.5；
|V4-V5|＝0.0。
Among second embodiment; The front surface radius-of-curvature of first lens is R1, and the back surface curvature radius of first lens is R2, and the front surface radius-of-curvature of the 4th lens is R7; The back surface curvature radius of the 4th lens is R8; The front surface radius-of-curvature of the 5th lens is R9, and the back surface curvature radius of the 5th lens is R10, and its relation is:
R1/R2＝-0.03；
R7/R8＝0.06；
R9/R10＝2.15。
Among second embodiment, the peripheral thickness of the 4th lens is ET4, and the center thickness of the 4th lens is CT4, and its relation is: ET4/CT4=1.40.
Among second embodiment, the imaging optical lens group is provided with a sense electronics optical element in addition and supplies the object imaging, and the optics total length of imaging optical lens group is TTL, and the maximum imaging of imaging optical lens group highly is ImgH, and its relation is: TTL/ImgH=1.84.
The detailed structured data of second embodiment is as shown in the table 3, and its aspherical surface data is as shown in the table 4, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as the half the of maximum visual angle.
Table 3: second embodiment of the invention structured data
Table 4: second embodiment of the invention aspherical surface data
Third embodiment of the invention sees also Fig. 3 A, and the aberration curve of the 3rd embodiment sees also Fig. 3 B, and the 3rd embodiment is extremely comprised as side by the thing side in regular turn:
The 3rd lens 30 of the positive refracting power of one tool, its material is a plastic cement, and the front surface 31 of the 3rd lens 30 is a concave surface, and surface, back 32 is a convex surface, and the front surface 31 of the 3rd lens 30 all is set to aspheric surface with surface, back 32 in addition;
The 4th lens 40 of the positive refracting power of one tool; Its material is a plastic cement, and the front surface 41 of the 4th lens 40 is a convex surface, and surface, back 42 is a concave surface; The front surface 41 of the 4th lens 40 all is set to aspheric surface with surface, back 42 in addition, and the front surface 41 of the 4th lens 40 all is provided with the point of inflexion with surface, back 42;
The 5th lens 50 of the negative refracting power of one tool; Its material is a plastic cement, and the front surface 51 of the 5th lens 50 is a convex surface, and surface, back 52 is a concave surface; The front surface 51 of the 5th lens 50 all is set to aspheric surface with surface, back 52 in addition, and the front surface 51 of the 5th lens 50 all is provided with the point of inflexion with surface, back 52;
One aperture 60 places before first lens 10;
One infrared ray filtering optical filter (IR Filter) 70 places after the 5th lens 50, and it does not influence the focal length of system;
One imaging surface 80 places after the infrared ray filtering optical filter 70.
The equational expression of the 3rd embodiment aspheric curve is as the pattern of first embodiment.
Among the 3rd embodiment, the focal length of whole imaging optical lens group is f, and the focal length of first lens is f1, and the focal length of second lens is f2, and the focal length of the 3rd lens is f3, and the focal length of the 4th lens is f4, and the focal length of the 5th lens is f5, and its relation is:
f＝3.82mm；
f/f1＝1.34；
f/f2＝-0.80；
f/f3＝0.68；
f/f4＝0.07；
f/f5＝-0.81。
Among the 3rd embodiment, the focal length of whole imaging optical lens group is f, and the mirror spacing between first lens and second lens is T12, and its relation is: (T12/f) * 100=5.4.
Among the 3rd embodiment, the first lens abbe number (Abbe Number) is V1, and the second lens abbe number is V2, and the 3rd lens abbe number is V3, and the 4th lens abbe number is V4, and the 5th lens abbe number is V5, and its relation is:
V1＝55.9；
V4＝55.9；
V1-V2＝32.5；
V3-V2＝32.5；
|V4-V5|＝0.1。
Among the 3rd embodiment; The front surface radius-of-curvature of first lens is R1, and the back surface curvature radius of first lens is R2, and the front surface radius-of-curvature of the 4th lens is R7; The back surface curvature radius of the 4th lens is R8; The front surface radius-of-curvature of the 5th lens is R9, and the back surface curvature radius of the 5th lens is R10, and its relation is:
R1/R2＝-0.30；
R7/R8＝1.03；
R9/R10＝3.92。
Among the 3rd embodiment, the peripheral thickness of the 4th lens is ET4, and the center thickness of the 4th lens is CT4, and its relation is: ET4/CT4=0.80.
Among the 3rd embodiment, the imaging optical lens group is provided with a sense electronics optical element in addition and supplies the object imaging, and the optics total length of imaging optical lens group is TTL, and the maximum imaging of imaging optical lens group highly is ImgH, and its relation is: TTL/ImgH=1.91.
The detailed structured data of the 3rd embodiment is as shown in the table 5, and its aspherical surface data is as shown in the table 6, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as the half the of maximum visual angle.
Table 5: third embodiment of the invention structured data
Table 6: third embodiment of the invention aspherical surface data
Fourth embodiment of the invention sees also Fig. 4 A, and the aberration curve of the 4th embodiment sees also Fig. 4 B, and the 4th embodiment is extremely comprised as side by the thing side in regular turn:
The 3rd lens 30 of the positive refracting power of one tool, its material is a plastic cement, and the front surface 31 of the 3rd lens 30 is a concave surface, and surface, back 32 is a convex surface, and the front surface 31 of the 3rd lens 30 all is set to aspheric surface with surface, back 32 in addition;
The 4th lens 40 of the positive refracting power of one tool; Its material is a plastic cement, and the front surface 41 of the 4th lens 40 is a convex surface, and surface, back 42 is a concave surface; The front surface 41 of the 4th lens 40 all is set to aspheric surface with surface, back 42 in addition, and the front surface 41 of the 4th lens 40 all is provided with the point of inflexion with surface, back 42;
The 5th lens 50 of the negative refracting power of one tool; Its material is a plastic cement, and the front surface 51 of the 5th lens 50 is a convex surface, and surface, back 52 is a concave surface; The front surface 51 of the 5th lens 50 all is set to aspheric surface with surface, back 52 in addition, and the front surface 51 of the 5th lens 50 all is provided with the point of inflexion with surface, back 52;
One aperture 60 places before first lens 10;
One infrared ray filtering optical filter (IR Filter) 70 places after the 5th lens 50, and it does not influence the focal length of system;
One imaging surface 80 places after the infrared ray filtering optical filter 70.
The equational expression of the 4th embodiment aspheric curve is as the pattern of first embodiment.
Among the 4th embodiment, the focal length of whole imaging optical lens group is f, and the focal length of first lens is f1, and the focal length of second lens is f2, and the focal length of the 3rd lens is f3, and the focal length of the 4th lens is f4, and the focal length of the 5th lens is f5, and its relation is:
f＝3.82mm；
f/f1＝1.24；
f/f2＝-0.78；
f/f3＝0.65；
f/f4＝0.05；
f/f5＝-0.61。
Among the 4th embodiment, the focal length of whole imaging optical lens group is f, and the mirror spacing between first lens and second lens is T12, and its relation is: (T12/f) * 100=6.6.
Among the 4th embodiment, the first lens abbe number (Abbe Number) is V1, and the second lens abbe number is V2, and the 3rd lens abbe number is V3, and the 4th lens abbe number is V4, and the 5th lens abbe number is V5, and its relation is:
V1＝55.9；
V4＝55.9；
V1-V2＝32.5；
V3-V2＝32.5；
|V4-V5|＝0.1。
Among the 4th embodiment; The front surface radius-of-curvature of first lens is R1, and the back surface curvature radius of first lens is R2, and the front surface radius-of-curvature of the 4th lens is R7; The back surface curvature radius of the 4th lens is R8; The front surface radius-of-curvature of the 5th lens is R9, and the back surface curvature radius of the 5th lens is R10, and its relation is:
R1/R2＝0.03；
R7/R8＝1.07；
R9/R10＝2.28。
Among the 4th embodiment, the peripheral thickness of the 4th lens is ET4, and the center thickness of the 4th lens is CT4, and its relation is: ET4/CT4=0.79.
Among the 4th embodiment, the imaging optical lens group is provided with a sense electronics optical element in addition and supplies the object imaging, and the optics total length of imaging optical lens group is TTL, and the maximum imaging of imaging optical lens group highly is ImgH, and its relation is: TTL/ImgH=1.93.
The detailed structured data of the 4th embodiment is as shown in the table 7, and its aspherical surface data is as shown in the table 8, and wherein, the unit of radius-of-curvature, thickness and focal length is mm, and HFOV is defined as the half the of maximum visual angle.
Table 7: fourth embodiment of the invention structured data
Table 8: fourth embodiment of the invention aspherical surface data
In the imaging optical lens group 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.
State clearly at this in advance; Table 1 to table 8 is depicted as the different numerical value change tables of imaging optical lens group embodiment; 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, and table 9 is the numerical data of the corresponding correlate equation of the present invention of each embodiment.
| First embodiment | Second embodiment | The 3rd embodiment | The 4th embodiment | |
| f | 6.17 | 6.10 | 3.82 | 3.82 |
| Fno | 2.8 | 2.8 | 2.8 | 2.8 |
| HFOV | 32.9 | 33.0 | 32.6 | 32.7 |
| V1 | 55.9 | 55.9 | 55.9 | 55.9 |
| V4 | 55.9 | 55.9 | 55.9 | 55.9 |
| V1-V2 | 32.5 | 32.5 | 32.5 | 32.5 |
| V3-V2 | 32.5 | 32.5 | 32.5 | 32.5 |
| |V4-V5| | 0.0 | 0.0 | 0.1 | 0.1 |
| (T12/f)*100 | 3.8 | 3.9 | 5.4 | 6.6 |
| ET4/CT4 | 1.34 | 1.40 | 0.80 | 0.79 |
| f/f1 | 1.35 | 1.40 | 1.34 | 1.24 |
| f/f2 | -0.89 | -0.94 | -0.80 | -0.78 |
| f/f3 | 0.50 | 0.50 | 0.68 | 0.65 |
| f/f4 | 0.50 | 0.50 | 0.07 | 0.05 |
| f/f5 | -1.06 | -1.05 | -0.81 | -0.61 |
| R1/R2 | 0.05 | -0.03 | -0.30 | 0.03 |
| R7/R8 | 0.06 | 0.06 | 1.03 | 1.07 |
| R9/R10 | 2.15 | 2.15 | 3.92 | 2.28 |
| TTL/ImgH | 1.83 | 1.84 | 1.91 | 1.93 |
Table 9: the numerical data of the corresponding correlate equation of each embodiment of the present invention
In sum, the present invention is a kind of imaging optical lens group, and mirror group volume can be effectively dwindled in lens arrangement, arrangement mode and eyeglass configuration by this, more can obtain higher resolving power simultaneously; So " practicality " of the present invention should be unquestionable, in addition, the feature technology of being exposed at this case embodiment; Before application, also be not shown in all publications, also be not disclosed use, not only had the fact of effect enhancement as stated; Have more can not be indiscreet and negligent additional effect, hereat, " novelty " of the present invention and " creativeness " have all met patent statute; So propose application for a patent for invention in accordance with the law, to request and give examination and grant quasi patent early, the true feeling moral is just.
Claims (25)
1. imaging optical lens group, this imaging optical lens group by the thing side to comprising in regular turn as side:
First lens of the positive refracting power of one tool, the first lens front surface is a convex surface;
Second lens of the negative refracting power of one tool;
The 3rd lens of the positive refracting power of one tool, its front surface are concave surface, and the surface, back is a convex surface;
The 4th lens of the positive refracting power of one tool;
One the 5th lens; And
One aperture, it places between the object and second lens;
In this imaging optical lens group, the number of lenses of tool refracting power is merely five, and the focal length of whole imaging optical lens group is f, and the focal length of first lens is f1, and its relation is: 1.1＜f/f1＜2.0; It is characterized in that: the focal length of said the 4th lens is f4, and the focal length of the 5th lens is f5, and its relation is: 0＜f/f4＜0.8;-2.0＜f/f5＜-0.75.
2. imaging optical lens group according to claim 1 is characterized in that: wherein, the surface is a concave surface behind the 5th lens.
3. imaging optical lens group according to claim 2 is characterized in that: wherein, the 5th lens front surface is a convex surface.
4. imaging optical lens group according to claim 3 is characterized in that: wherein, the surface is a concave surface behind second lens.
5. imaging optical lens group according to claim 4 is characterized in that: wherein, the 5th lens are plastic cement material, and the 5th lens are provided with the point of inflexion.
6. imaging optical lens group according to claim 5 is characterized in that: wherein, the 4th lens are plastic cement material, and the 4th lens are provided with the point of inflexion.
7. imaging optical lens group according to claim 5 is characterized in that: wherein, the 4th lens front surface is a convex surface, and the surface, back is a concave surface.
8. imaging optical lens group according to claim 7 is characterized in that: wherein, aperture places before first lens.
9. imaging optical lens group according to claim 8 is characterized in that: wherein, the 4th lens are plastic cement material; The 4th lens one side at least are aspheric surface; The 4th lens abbe number is V4, and its relation is: 40＜V4＜70, the five lens front surfaces are all aspheric surface with the surface, back.
10. imaging optical lens group according to claim 9 is characterized in that: wherein, second lens are plastic cement material, and second lens one side at least are aspheric surface, and the 3rd lens are plastic cement material, and the 3rd lens one side at least are aspheric surface.
11. imaging optical lens group according to claim 10; It is characterized in that: wherein, first lens are plastic cement material, and first lens one side at least are aspheric surface; The first lens abbe number is V1; The second lens abbe number is V2, and the 3rd lens abbe number is V3, and its relation is: V1-V2＞15; V3-V2＞15.
12. imaging optical lens group according to claim 1 is characterized in that: wherein, the focal length of whole imaging optical lens group is f, and the focal length of second lens is f2, and its relation is :-2.5＜f/f2＜-0.7.
13. imaging optical lens group according to claim 1 is characterized in that: wherein, the focal length of whole imaging optical lens group is f, and the focal length of the 4th lens is f4, and its relation is: 0＜f/f4＜0.3.
14. imaging optical lens group according to claim 8 is characterized in that: wherein, the front surface radius-of-curvature of first lens is R1, and the back surface curvature radius of first lens is R2, and its relation is: R1/R2＞-0.22.
15. imaging optical lens group according to claim 14 is characterized in that: wherein, the front surface radius-of-curvature of the 4th lens is R7, and the back surface curvature radius of the 4th lens is R8, and its relation is: 0＜R7/R8＜1.6.
16. imaging optical lens group according to claim 1 is characterized in that: wherein, the mirror spacing between first lens and second lens is T12, and the focal length of whole imaging optical lens group is f, and its relation is: 0.4＜(T12/f) * 100＜15.
17. imaging optical lens group according to claim 7 is characterized in that: wherein, the back surface of first lens is a concave surface.
18. imaging optical lens group according to claim 1 is characterized in that: wherein, the front surface of second lens is a convex surface.
19. imaging optical lens group according to claim 8 is characterized in that: wherein, the first lens abbe number is V1, and its relation is: 50＜V1＜58.
20. imaging optical lens group according to claim 8 is characterized in that: wherein, the peripheral thickness ET4 of the 4th lens, the center thickness CT4 of the 4th lens, its relation is: 0.6＜ET4/CT4＜1.0.
21. imaging optical lens group according to claim 1 is characterized in that: wherein, the focal length of whole imaging optical lens group is f; The focal length of first lens is f1; The focal length of the 3rd lens is f3, and the focal length of the 4th lens is f4, and its relation is: 1.1＜f/f1＜1.4; 0.6＜f/f3＜0.8; 0.03＜f/f4＜0.2.
22. imaging optical lens group according to claim 15 is characterized in that: wherein, the front surface radius-of-curvature of first lens is R1, and the back surface curvature radius of first lens is R2, and its relation is :-0.2＜R1/R2＜0.3.
23. imaging optical lens group according to claim 22 is characterized in that: wherein, the front surface radius-of-curvature of the 5th lens is R9, and the back surface curvature radius of the 5th lens is R10, and its relation is: 2.0＜R9/R10＜4.0.
24. imaging optical lens group according to claim 1; It is characterized in that: wherein; The imaging optical lens group is provided with a sense electronics optical element in addition and supplies the object imaging; The optics total length of imaging optical lens group is TTL, and the maximum imaging of imaging optical lens group highly is ImgH, and its relation is: TTL/ImgH＜2.05.
25. imaging optical lens group according to claim 1 is characterized in that: wherein, the 5th lens are negative refracting power, and the 4th lens abbe number is V4, and the 5th lens abbe number is V5, and its relation is: | V4-V5|＜15.
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