CN202025118U - Thin photographic lens group - Google Patents

Abstract

The utility model discloses a thin photographic lens group, which sequentially includes from the object side to the image side: a first lens with positive refractive power, the object side surface is a convex surface, the image side surface is a concave surface, and the object side surface is a concave surface. At least one side of the object-side surface and the image-side surface is aspherical; a second lens with negative refractive power has a concave object-side surface and a convex image-side surface, and at least one of the object-side surface and the image-side surface is aspherical; the third lens The dispersion coefficient of one lens is V1, the dispersion coefficient of the second lens is V2, the overall focal length of the thin photography lens group is f, the focal length of the second lens is f2, and the radius of curvature of its object-side surface is R3, The thin photography lens group is further provided with an aperture, the distance from the aperture to the imaging surface on the optical axis is SL, and the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TTL, which satisfies the following relationship: 15＜|V1-V2|＜48; -0.43＜f/f2＜0; -1.50＜R3/f＜-0.40; 0.9＜SL/TTL＜1.1; Through the above lens group configuration, the lens can be effectively reduced Volume, correction of system aberrations and astigmatism can achieve higher resolution.

Description

Slim photographic lens group

Technical field

The utility model relates to a kind of photographic lens group, particularly a kind of slim photographic lens group that is applied to the miniaturization two-chip type of electronic product.

Background technology

In recent years, along with the demand of slim phtographic lens day by day increases, and along with progressing greatly of manufacture of semiconductor technology, make phtographic lens at present nothing more than adopting photosensitive coupling component (Charge Coupled Device, CCD) or complementary matal-oxide semiconductor assembly (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor) photosensory assembly, its picture element size is able to miniaturization, add that electronic product is a development trend with compact external form now, therefore, possess good image quality and slim optical system simultaneously and become in the market main flow.

Traditional slim shooting optical lens group is for considering the revisal of aberration, and how based on the three-chip type lens arrangement, wherein the most general is positive and negative positive Triplet pattern, as United States Patent (USP) US7145736 number.But when Lens during constantly toward lightening dwindling, the system imaging space is also and then tightened, and therefore makes inserting of three lens become difficult, and in limited space, the thickness of eyeglass also need and then dwindle, and will make that the material uniformity coefficient of the eyeglass that plastic shaping is made is bad.

In order effectively to shorten the camera lens total length and to take into account the yield that eyeglass is made, can make pick-up lens only contain two lens.And in order to revise aberration, generally can adopt the form of preposition aperture, a kind of slim shooting optical frames group that is made of two lens is disclosed as US Patent specification US7436604, but its second lens shape adopts biconcave lens, for the correction of aberration and astigmatism, its effect is not so good as the remarkable of crescent lens.

The utility model content

The technical problems to be solved in the utility model provides a kind of slim photographic lens group, and it can effectively dwindle camera lens volume, update the system aberration and astigmatism, obtains higher resolving power.

For solving the problems of the technologies described above, slim photographic lens group of the present utility model constitutes by two, its by the thing side to comprising in regular turn as side: first lens of the positive refracting power of a tool, its thing side surface are convex surface, be concave surface as side surface, and this thing side surface and picture side surface one side at least are aspheric surface; Second lens of the negative refracting power of one tool, its thing side surface are concave surface, be convex surface as side surface, this thing side surface and picture side surface one side at least are aspheric surface; The lens of tool refracting power are two in this slim photographic lens group, and the abbe number of described first lens is V1, the abbe number of described second lens is V2, the whole focal length of this slim photographic lens group is f, the focal length of described second lens is f2, the thing side surface radius-of-curvature of these second lens is R3, in addition, this slim photographic lens group is provided with an aperture in addition, this aperture to the distance of imaging surface on optical axis is SL, the thing side surface of described first lens to the distance of imaging surface on optical axis is TTL, and satisfies the following relationship formula: 15＜| V1-V2|＜48;-0.43＜f/f2＜0;-1.50＜R3/f＜-0.40; 0.9＜SL/TTL＜1.1; By above-mentioned lens group configuration mode, can effectively dwindle camera lens volume, update the system aberration and astigmatism, more can obtain higher resolving power.

The utility model also provides a kind of slim photographic lens group, it is extremely comprised as side in regular turn by the thing side: first lens of the positive refracting power of a tool, its thing side surface is convex surface, be concave surface as side surface, this thing side surface be all aspheric surface as side surface, these first lens are plastics; Second lens of the negative refracting power of one tool, its thing side surface are concave surface, be convex surface as side surface, this thing side surface be all aspheric surface as side surface, these second lens are plastics; The lens of tool refracting power are two in this slim photographic lens group, and the abbe number of described first lens is V1, the abbe number of described second lens is V2, the whole focal length of this slimming photographic lens group is f, the focal length of described second lens is f2, the refractive index of described first lens is N1, the refractive index of described second lens is N2, these second lens be Bf as side surface to the distance of imaging surface on optical axis, the center thickness of these second lens is CT2, satisfies the following relationship formula: 15＜| V1-V2|＜48;-0.43＜f/f2＜0; N2＞N1; 0.4＜Bf/CT2＜2.0.Wherein: when the positive refracting power of the described first lens tool, then and can provide system required part refracting power, help to shorten the total length of this system.

When the negative refracting power of the described second lens tool, then its effective update the system aberration helps to improve image quality.

When the thing side surface of described first lens be convex surface, when being concave surface as side surface, then it helps the update the system astigmatism.

When the thing side surface of described second lens be concave surface, when being convex surface as side surface, then it helps the higher order aberratons of update the system.

When 15＜| during V1-V2|＜48, help the correction of system's aberration; Preferably, satisfy 23＜| V1-V2|＜45; Best, satisfy 30＜| V1-V2|＜42.

When-0.43＜f/f2＜0, the refracting power of described second lens is comparatively suitable, effectively the update the system aberration; Preferably, satisfy-0.27＜f/f2＜0.

When-1.50＜R3/f＜-0.40, then can strengthen the effect of the described second lens correction aberration; Preferably, satisfy-1.20＜R3/f＜-0.50.

When 0.9＜SL/TTL＜1.1, then help this slim photographic lens group and obtain good balance at the heart far away and wide-angle characteristic.

In the slim photographic lens group of the utility model, the thing side surface of described first lens be respectively R1 and R2 as the radius-of-curvature of side surface, when both satisfy 0＜R1/R2＜0.8 relational expression, effective update the system spherical aberration then; Preferably, satisfy 0.40＜R1/R2＜0.60.

In the slim photographic lens group of the utility model, the center thickness of described first lens is CT1, the center thickness of described second lens is CT2, when both satisfy 0.25＜CT1/CT2＜0.95 relational expression, then this first and second lens thickness size is comparatively suitable, can reduce these first and second lens and make and the degree of difficulty of assembling; Preferably, satisfy 0.40＜CT1/CT2＜0.76.

In the slim photographic lens group of the utility model, the refractive index of described first lens is N1, and the refractive index of described second lens is N2, when both satisfy N2＞N1 relational expression, this first and second index of refraction in lens is then comparatively suitable, helps shortening system's total length and possesses favorable imaging quality; Preferably, satisfy 0.04＜N2-N1＜0.18.

In the slim photographic lens group of the utility model, described second lens be Bf as side surface to the distance of imaging surface on optical axis, the center thickness of these second lens is CT2, when both satisfy 0.4＜Bf/CT2＜2.0 relational expressions, then there are enough spaces to place other assemblies between second lens and the sense electronics optical assembly; Preferably, satisfy 0.95＜Bf/CT2＜1.65.

In the slim photographic lens group of the utility model, the thing side surface of described first lens to the distance of imaging surface on optical axis is TTL, in this imaging surface one sense electronics optical assembly is set in addition, long half of the effective picture element of this sense electronics optical assembly zone diagonal line is ImgH, when both satisfy TTL/ImgH＜1.95 relational expressions, then help keeping the miniaturization of slim photographic lens group, to be equipped on the frivolous portable electronic product.

Slim photographic lens group of the present utility model, it has two lens, can effectively dwindle the camera lens volume; Simultaneously, by the configuration of adjusting the utility model lens group eyeglass Material Selection and curvature, it is update the system aberration and astigmatism effectively, obtains higher resolving power.

Accompanying drawing and subordinate list explanation

Below in conjunction with accompanying drawing, subordinate list and embodiment the utility model is described in further detail:

Figure 1A is the optical schematic diagram of the utility model first embodiment;

Figure 1B is the utility model first embodiment aberration curve figure;

Fig. 2 A is the optical schematic diagram of the utility model second embodiment;

Fig. 2 B is the utility model second embodiment aberration curve figure;

Fig. 3 A is the optical schematic diagram of the utility model the 3rd embodiment;

Fig. 3 B is the utility model the 3rd embodiment aberration curve figure;

Fig. 4 A is the optical schematic diagram of the utility model the 4th embodiment;

Fig. 4 B is the utility model the 4th embodiment aberration curve figure;

Fig. 5 A is the optical schematic diagram of the utility model the 5th embodiment;

Fig. 5 B is the utility model the 5th embodiment aberration curve figure;

Fig. 6 A is the optical schematic diagram of the utility model the 6th embodiment;

Fig. 6 B is the utility model the 6th embodiment aberration curve figure;

Table 1 is the first embodiment optical data;

Table 2 is the first embodiment aspherical surface data;

Table 3 is the second embodiment optical data;

Table 4 is the second embodiment aspherical surface data;

Table 5 is the 3rd embodiment optical data;

Table 6 is the 3rd embodiment aspherical surface data;

Table 7 is the 4th embodiment optical data;

Table 8 is the 4th embodiment aspherical surface data;

Table 9 is the 5th embodiment optical data;

Table 10 is the 5th embodiment aspherical surface data;

Table 11 is the 6th embodiment optical data;

Table 12 is the 6th embodiment aspherical surface data;

Table 13 is the numerical data of the utility model correlationship formula;

Wherein:

First lens are 110,210,310,410,510,610;

The thing side surface is 111,211,311,411,511,611;

As side surface is 112,212,312,412,512,612;

Second lens are 120,220,320,420,520,620;

The thing side surface is 121,221,321,421,521,621;

As side surface is 122,222,322,422,522,622;

Aperture is 100,200,300,400,500,600;

Optical axis is 150,250,350,450,550,650;

Infrared filter (IR Filter) is 170,270,370,470,570,670;

Imaging surface is 190,290,390,490,590,690;

S is the sagittal surface astigmatism;

T is the meridian ellipse astigmatism;

Symbol implication in the instructions:

CT1: the center thickness of first lens;

CT2: the center thickness of second lens;

F: the whole focal length of photo-optic system;

F2: the focal length of second lens;

ImgH: half that the effective picture element of sense electronics optical assembly zone diagonal line is long;

R1: the thing side surface radius-of-curvature of first lens;

R2: the picture side surface radius-of-curvature of first lens;

R3: the thing side surface radius-of-curvature of second lens;

SL: aperture is to the distance of imaging surface on optical axis;

TTL: the thing side surface of first lens is to the distance of imaging surface on optical axis;

V1: the abbe number of first lens;

V2: the abbe number of second lens;

N1: the refractive index of first lens;

N2: the refractive index of second lens;

Bf: the picture side surface of second lens is to the distance of imaging surface on optical axis.

Embodiment

The slim photographic lens group that the utility model first embodiment is provided is as Figure 1A and Figure 1B.Figure 1A is the slim photographic lens configuration set of the utility model first an embodiment synoptic diagram, and Figure 1B is the utility model first embodiment aberration curve figure, and shown in Figure 1A, first embodiment comprises from the object side to image side:

First lens 110 of the positive refracting power of one tool, its material is plastics, these first lens, 110 thing side surfaces 111 are convex surface, are concave surface as side surface 112, the thing side surface 111 of these first lens 110 with all be made as aspheric surface as side surface 112.

Second lens 120 of the negative refracting power of one tool, its material is plastics, these second lens, 120 thing side surfaces 121 be concave surface, are convex surface as side surface 122, the thing side surface 121 of these second lens 120 and all be made as aspheric surface as side surface 122.

One aperture 100, it is located between object (not showing on the figure) and described first lens 110.

One infrared filter (IR-filter) 170, it is located between described second lens, 120 picture side surfaces 122 and the imaging surface 190, and the material of this infrared filter 170 is glass and the focal length that does not influence this slim photographic lens group.

The equation of above-mentioned aspheric curve is expressed as follows:

$X\left(Y\right)=(Y^2/R)/(l+\mathrm{sqrt}(1-(1+k)*{(Y/R)}^2))+\underset{i}{\mathrm{\Σ}}\left(\mathrm{Ai}\right)*\left(Y^i\right)$

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.

Among first embodiment, the whole focal length of this slim photographic lens group is f, and its relational expression is: f=1.84.

Among first embodiment, the whole f-number (f-number) of this slim photographic lens group is Fno, and its relational expression is: Fno=2.45.

Among first embodiment, half of the whole maximum visual angle of this slim photographic lens group is HFOV, and its relational expression is: HFOV=33.0.

Among first embodiment, the abbe number of described first lens 110 is V1, and the abbe number of described second lens 120 is V2, and its relational expression is: | V1-V2|=32.5.

Among first embodiment, the refractive index of described first lens 110 is N1, and the refractive index of described second lens 120 is N2, and its relational expression is: N2-N1=0.09.

Among first embodiment, the center thickness of described first lens 110 is CT1, and the center thickness of described second lens 120 is CT2, and its relational expression is: CT1/CT2=0.59.

Among first embodiment, the thing side surface 111 of described first lens 110 is respectively R1 and R2 with the radius-of-curvature as side surface 112, and its relational expression is: R1/R2=0.57.

Among first embodiment, the whole focal length of this slim photographic lens group is f, and thing side surface 121 radius-of-curvature of described second lens 120 are R3, and its relational expression is: R3/f=-1.01.

Among first embodiment, the whole focal length of this slim photographic lens group is f, and the focal length of described second lens 120 is f2, and its relational expression is: f/f2=-0.004.

Among first embodiment, described second lens 120 the distance on 150 is Bf to imaging surface 190 in optical axis as side surface 122, the center thickness of these second lens 120 is CT2, its relational expression is: Bf/CT2=1.21.

Among first embodiment, the distance on 150 is SL to described aperture 100 to imaging surface 190 in optical axis, and the distance on 150 is TTL to the thing side surface 111 of described first lens 110 to imaging surface 190 in optical axis, and its relational expression is: SL/TTL=0.94.

Among first embodiment, distance on 150 is TTL to the thing side surface 111 of described first lens 110 to imaging surface 190 in optical axis, this slim photographic lens group is provided with a sense electronics optical assembly (not showing on the figure) in addition in described imaging surface 190, long half of the effective picture element of this sense electronics optical assembly zone diagonal line is ImgH, and its relational expression is: TTL/ImgH=1.71.

The structured data that first embodiment is detailed is as shown in table 1, and reference wavelength is d-line 587.6nm, and wherein the effective radius on the 4th surface is 0.31mm, and its aspherical surface data is as shown in table 2, and wherein, the unit of radius-of-curvature, thickness and focal length is a millimetre (mm).

Table 1

Table 2

By Figure 1B as can be known, present embodiment lens imaging quality is good, and its spherical aberration is between positive and negative 0.05mm, and astigmatism is between positive and negative 0.05mm, and distortion is between positive and negative 1.5%.

The slim photographic lens group that the utility model second embodiment is provided is as Fig. 2 A and Fig. 2 B.Fig. 2 A is the slim photographic lens configuration set of the utility model second an embodiment synoptic diagram, and Fig. 2 B is the utility model second embodiment aberration curve figure, and second embodiment comprises from the object side to image side:

First lens 210 of the positive refracting power of one tool, its material is plastics, these first lens, 210 thing side surfaces 211 are convex surface, are concave surface as side surface 212, the thing side surface 211 of these first lens 210 with all be made as aspheric surface as side surface 212.

Second lens 220 of the negative refracting power of one tool, its material is plastics, these second lens, 220 thing side surfaces 221 be concave surface, are convex surface as side surface 222, the thing side surface 221 of these second lens 220 and all be made as aspheric surface as side surface 222.

One aperture 200, it is located between object (not showing on the figure) and described first lens 210.

One infrared filter (IR-filter) 270, it is located between described second lens, 220 picture side surfaces 222 and the imaging surface 290, and the material of this infrared filter 270 is glass and the focal length that does not influence this slim photographic lens group.

The equational expression of the second embodiment aspheric curve is as the pattern of first embodiment.

Among second embodiment, the whole focal length of this slim photographic lens group is f, and its relational expression is: f=1.96.

Among second embodiment, the whole f-number (f-number) of this slim photographic lens group is Fno, and its relational expression is: Fno=2.85.

Among second embodiment, half of the whole maximum visual angle of this slim photographic lens group is HFOV, and its relational expression is: HFOV=31.0.

Among second embodiment, the abbe number of described first lens 210 is V1, and the abbe number of described second lens 220 is V2, and its relational expression is: | V1-V2|=32.1.

Among second embodiment, the refractive index of described first lens 210 is N1, and the refractive index of described second lens 220 is N2, and its relational expression is: N2-N1=0.09.

Among second embodiment, the center thickness of described first lens 210 is CT1, and the center thickness of described second lens 220 is CT2, and its relational expression is: CT1/CT2=0.51.

Among second embodiment, the thing side surface 211 of described first lens 210 is respectively R1 and R2 with the radius-of-curvature as side surface 212, and its relational expression is: R1/R2=0.48.

Among second embodiment, the whole focal length of this slim photographic lens group is f, and thing side surface 221 radius-of-curvature of described second lens 220 are R3, and its relational expression is: R3/f=-0.61.

Among second embodiment, the whole focal length of this slim photographic lens group is f, and the focal length of described second lens 220 is f2, and its relational expression is: f/f2=-0.272.

Among second embodiment, described second lens 220 the distance on 250 is Bf to imaging surface 290 in optical axis as side surface 222, the center thickness of these second lens 220 is CT2, its relational expression is: Bf/CT2=1.11.

Among second embodiment, the distance on 250 is SL to described aperture 200 to imaging surface 290 in optical axis, and the distance on 250 is TTL to the thing side surface 211 of described first lens 210 to imaging surface 290 in optical axis, and its relational expression is: SL/TTL=0.94.

Among second embodiment, distance on 250 is TTL to the thing side surface 211 of described first lens 210 to imaging surface 290 in optical axis, this slim photographic lens group is provided with a sense electronics optical assembly (not showing on the figure) in addition in described imaging surface 290, long half of the effective picture element of this sense electronics optical assembly zone diagonal line is ImgH, and its relational expression is: TTL/ImgH=1.75.

The structured data that second embodiment is detailed is as shown in table 3, and reference wavelength is d-line 587.6nm, and its aspherical surface data is as shown in table 4, and wherein, the unit of radius-of-curvature, thickness and focal length is a millimetre (mm).

Table 3

Table 4

By Fig. 2 B as can be known, present embodiment lens imaging quality is good, and its spherical aberration is between positive and negative 0.05mm, and astigmatism is between positive and negative 0.05mm, and distortion is between positive and negative 1.5%.

The slim photographic lens group that the utility model the 3rd embodiment is provided is as Fig. 3 A and Fig. 3 B.Fig. 3 A is the slim photographic lens configuration set synoptic diagram of the utility model the 3rd embodiment, and Fig. 3 B is the utility model the 3rd embodiment aberration curve figure, and the 3rd embodiment comprises from the object side to image side:

First lens 310 of the positive refracting power of one tool, its material is plastics, these first lens, 310 thing side surfaces 311 are convex surface, are concave surface as side surface 312, the thing side surface 311 of these first lens 310 with all be made as aspheric surface as side surface 312.

Second lens 320 of the negative refracting power of one tool, its material is plastics, these second lens, 320 thing side surfaces 321 be concave surface, are convex surface as side surface 322, the thing side surface 321 of these second lens 320 and all be made as aspheric surface as side surface 322.

One aperture 300, it is located between object (not showing on the figure) and described first lens 310.

One infrared filter (IR-filter) 370, it is located between described second lens, 320 picture side surfaces 322 and the imaging surface 390, and the material of this infrared filter 370 is glass and the focal length that does not influence this slim photographic lens group.

The equational expression of the 3rd embodiment aspheric curve is as the pattern of first embodiment.

Among the 3rd embodiment, the whole focal length of this slim photographic lens group is f, and its relational expression is: f=1.89.

Among the 3rd embodiment, the whole f-number (f-number) of this slim photographic lens group is Fno, and its relational expression is: Fno=3.00.

Among the 3rd embodiment, half of the whole maximum visual angle of this slim photographic lens group is HFOV, and its relational expression is: HFOV=31.9.

Among the 3rd embodiment, the abbe number of described first lens 310 is V1, and the abbe number of described second lens 320 is V2, and its relational expression is: | V1-V2|=25.6.

Among the 3rd embodiment, the refractive index of described first lens 310 is N1, and the refractive index of described second lens 320 is N2, and its relational expression is: N2-N1=0.05.

Among the 3rd embodiment, the center thickness of described first lens 310 is CT1, and the center thickness of described second lens 320 is CT2, and its relational expression is: CT1/CT2=0.47.

Among the 3rd embodiment, the thing side surface 311 of described first lens 310 is respectively R1 and R2 with the radius-of-curvature as side surface 312, and its relational expression is: R1/R2=0.48.

Among the 3rd embodiment, the whole focal length of this slim photographic lens group is f, and thing side surface 321 radius-of-curvature of described second lens 320 are R3, and its relational expression is: R3/f=-0.60.

Among the 3rd embodiment, the whole focal length of this slim photographic lens group is f, and the focal length of described second lens 320 is f2, and its relational expression is: f/f2=-0.110.

Among the 3rd embodiment, described second lens 320 the distance on 350 is Bf to imaging surface 390 in optical axis as side surface 322, the center thickness of these second lens 320 is CT2, its relational expression is: Bf/CT2=1.05.

Among the 3rd embodiment, the distance on 350 is SL to described aperture 300 to imaging surface 390 in optical axis, and the distance on 350 is TTL to the thing side surface 311 of described first lens 310 to imaging surface 390 in optical axis, and its relational expression is: SL/TTL=0.95.

Among the 3rd embodiment, distance on 350 is TTL to the thing side surface 311 of described first lens 310 to imaging surface 390 in optical axis, this slim photographic lens group is provided with a sense electronics optical assembly (not showing on the figure) in addition in described imaging surface 390, long half of the effective picture element of this sense electronics optical assembly zone diagonal line is ImgH, and its relational expression is: TTL/ImgH=1.75.

The detailed structured data of the 3rd embodiment is as shown in the table 5, and reference wavelength is d-line 587.6nm, 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 a millimetre (mm).

Table 5

Table 6

By Fig. 3 B as can be known, present embodiment lens imaging quality is good, and its spherical aberration is between positive and negative 0.05mm, and astigmatism is between positive and negative 0.05mm, and distortion is between positive and negative 1.5%.

The slim photographic lens group that the utility model the 4th embodiment is provided is as Fig. 4 A and 4B.The slim photographic lens configuration set synoptic diagram of Fig. 4 A figure the utility model the 4th embodiment, Fig. 4 B are the utility model the 4th embodiment aberration curve figure, and the 4th embodiment comprises from the object side to image side:

First lens 410 of the positive refracting power of one tool, its material is plastics, these first lens, 410 thing side surfaces 411 are convex surface, are concave surface as side surface 412, the thing side surface 411 of these first lens 410 with all be made as aspheric surface as side surface 412.

Second lens 420 of the negative refracting power of one tool, its material is plastics, these second lens, 420 thing side surfaces 421 be concave surface, are convex surface as side surface 422, the thing side surface 421 of these second lens 420 and all be made as aspheric surface as side surface 422.

One aperture 400, it is located between object (not showing on the figure) and described first lens 410.

One infrared filter (IR-filter) 470, it is located between described second lens, 420 picture side surfaces 422 and the imaging surface 490, and the material of this infrared filter 470 is glass and the focal length that does not influence this slim photographic lens group.

The equational expression of the 4th embodiment aspheric curve is as the pattern of first embodiment.

Among the 4th embodiment, the whole focal length of this slim photographic lens group is f, and its relational expression is: f=1.89.

Among the 4th embodiment, the whole f-number (f-number) of this slim photographic lens group is Fno, and its relational expression is: Fno=2.60.

Among the 4th embodiment, half of the whole maximum visual angle of this slim photographic lens group is HFOV, and its relational expression is: HFOV=31.9.

Among the 4th embodiment, the abbe number of described first lens 410 is V1, and the abbe number of described second lens 420 is V2, and its relational expression is: | V1-V2|=34.4.

Among the 4th embodiment, the refractive index of described first lens 410 is N1, and the refractive index of described second lens 420 is N2, and its relational expression is: N2-N1=0.12.

Among the 4th embodiment, the center thickness of described first lens 410 is CT1, and the center thickness of described second lens 420 is CT2, and its relational expression is: CT1/CT2=0.53.

Among the 4th embodiment, the thing side surface 411 of described first lens 410 is respectively R1 and R2 with the radius-of-curvature as side surface 412, and its relational expression is: R1/R2=0.45.

Among the 4th embodiment, the whole focal length of this slim photographic lens group is f, and thing side surface 421 radius-of-curvature of described second lens 420 are R3, and its relational expression is: R3/f=-0.59.

Among the 4th embodiment, the whole focal length of this slim photographic lens group is f, and the focal length of described second lens 420 is f2, and its relational expression is: f/f2=-0.167.

Among the 4th embodiment, described second lens 420 the distance on 450 is Bf to imaging surface 490 in optical axis as side surface 422, the center thickness of these second lens 420 is CT2, its relational expression is: Bf/CT2=1.23.

Among the 4th embodiment, the distance on 450 is SL to described aperture 400 to imaging surface 490 in optical axis, and the distance on 450 is TTL to the thing side surface 411 of described first lens 410 to imaging surface 490 in optical axis, and its relational expression is: SL/TTL=0.94.

Among the 4th embodiment, distance on 450 is TTL to the thing side surface 411 of described first lens 410 to imaging surface 490 in optical axis, this slim photographic lens group is provided with a sense electronics optical assembly (not showing on the figure) in addition in described imaging surface 490, long half of the effective picture element of this sense electronics optical assembly zone diagonal line is ImgH, and its relational expression is: TTL/ImgH=1.75.

The detailed structured data of the 4th embodiment is as shown in the table 7, and reference wavelength is d-line 587.6nm, and wherein the effective radius on the 4th surface is 0.32mm, 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 a millimetre (mm).

Table 7

Table 8

By Fig. 4 B as can be known, present embodiment lens imaging quality is good, and its spherical aberration is between positive and negative 0.05mm, and astigmatism is between positive and negative 0.05mm, and distortion is between positive and negative 1.5%.

The slim photographic lens group that the utility model the 5th embodiment is provided is as Fig. 5 A and Fig. 5 B.Fig. 5 A figure is the slim photographic lens configuration set synoptic diagram of the utility model the 5th embodiment, and Fig. 5 B is the utility model the 5th embodiment aberration curve figure, and the 5th embodiment comprises from the object side to image side:

First lens 510 of the positive refracting power of one tool, its material is plastics, these first lens, 510 thing side surfaces 511 are convex surface, are concave surface as side surface 512, the thing side surface 511 of these first lens 510 with all be made as aspheric surface as side surface 512.

Second lens 520 of the negative refracting power of one tool, its material is plastics, these second lens, 520 thing side surfaces 521 be concave surface, are convex surface as side surface 522, the thing side surface 521 of these second lens 520 and all be made as aspheric surface as side surface 522.

One aperture 500, it is located between these first lens 510 and described second lens 520.

One infrared filter (IR-filter) 570, it is located between described second lens, 520 picture side surfaces 522 and the imaging surface 590, and the material of this infrared filter 570 is glass and the focal length that does not influence this slim photographic lens group.

The equational expression of the 5th embodiment aspheric curve is as the pattern of first embodiment.

Among the 5th embodiment, the whole focal length of this slim photographic lens group is f, and its relational expression is: f=2.98.

Among the 5th embodiment, the whole f-number (f-number) of this slim photographic lens group is Fno, and its relational expression is: Fno=2.85.

Among the 5th embodiment, half of the whole maximum visual angle of this slim photographic lens group is HFOV, and its relational expression is: HFOV=26.1.

Among the 5th embodiment, the abbe number of described first lens 510 is V1, and the abbe number of described second lens 520 is V2, and its relational expression is: | V1-V2|=33.1.

Among the 5th embodiment, the refractive index of described first lens 510 is N1, and the refractive index of described second lens 520 is N2, and its relational expression is: N2-N1=0.09.

Among the 5th embodiment, the center thickness of described first lens 510 is CT1, and the center thickness of described second lens 520 is CT2, and its relational expression is: CT1/CT2=0.76.

Among the 5th embodiment, the thing side surface 511 of described first lens 510 is respectively R1 and R2 with the radius-of-curvature as side surface 512, and its relational expression is: R1/R2=0.44.

Among the 5th embodiment, the whole focal length of this slim photographic lens group is f, and thing side surface 521 radius-of-curvature of described second lens 520 are R3, and its relational expression is: R3/f=-0.65.

Among the 5th embodiment, the whole focal length of this slim photographic lens group is f, and the focal length of described second lens 520 is f2, and its relational expression is: f/f2=-0.390.

Among the 5th embodiment, described second lens 520 the distance on 550 is Bf to imaging surface 590 in optical axis as side surface 522, the center thickness of these second lens 520 is CT2, its relational expression is: Bf/CT2=0.97.

Among the 5th embodiment, the distance on 550 is SL to described aperture 500 to imaging surface 590 in optical axis, and the distance on 550 is TTL to the thing side surface 511 of described first lens 510 to imaging surface 590 in optical axis, and its relational expression is: SL/TTL=0.75.

Among the 5th embodiment, distance on 550 is TTL to the thing side surface 511 of described first lens 510 to imaging surface 590 in optical axis, this slim photographic lens group is provided with a sense electronics optical assembly (not showing on the figure) in addition in described imaging surface 590, long half of the effective picture element of this sense electronics optical assembly zone diagonal line is ImgH, and its relational expression is: TTL/ImgH=2.13.

The detailed structured data of the 5th embodiment is as shown in the table 9, and its reference wavelength is d-line 587.6nm, and its aspherical surface data is as shown in the table 10, and wherein, the unit of radius-of-curvature, thickness and focal length is a millimetre (mm).

Table 9

Table 10

By Fig. 5 B as can be known, present embodiment lens imaging quality is good, and its spherical aberration is between positive and negative 0.05mm, and astigmatism is between positive and negative 0.05mm, and distortion is between positive and negative 1.5%.

The slim photographic lens group that the utility model the 6th embodiment is provided is as Fig. 6 A and Fig. 6 B; Fig. 6 A figure is the slim photographic lens configuration set synoptic diagram of the utility model the 6th embodiment, and Fig. 6 B is the utility model the 6th embodiment aberration curve figure, and the 6th embodiment comprises from the object side to image side:

First lens 610 of the positive refracting power of one tool, its material is plastics, these first lens, 610 thing side surfaces 611 are convex surface, are concave surface as side surface 612, the thing side surface 611 of these first lens 610 with all be made as aspheric surface as side surface 612.

Second lens 620 of the negative refracting power of one tool, its material is plastics, these second lens, 620 thing side surfaces 621 be concave surface, are convex surface as side surface 622, the thing side surface 621 of these second lens 620 and all be made as aspheric surface as side surface 622.

One aperture 600, it is located between these first lens 610 and described second lens 620.

One infrared filter (IR-filter) 670, it is located between described second lens, 620 picture side surfaces 622 and the imaging surface 690, and the material of this infrared filter 670 is glass and the focal length that does not influence this slimming photographic lens group.

The equational expression of the 6th embodiment aspheric curve is as the pattern of first embodiment.

Among the 6th embodiment, the whole focal length of this slim photographic lens group is f, and its relational expression is: f=2.97.

Among the 6th embodiment, the whole f-number (f-number) of this slim photographic lens group is Fno, and its relational expression is: Fno=3.00.

Among the 6th embodiment, half of the whole maximum visual angle of this slim photographic lens group is HFOV, and its relational expression is: HFOV=26.0.

Among the 6th embodiment, the abbe number of described first lens 610 is V1, and the abbe number of described second lens 620 is V2, and its relational expression is: | V1-V2|=35.1.

Among the 6th embodiment, the refractive index of described first lens 610 is N1, and the refractive index of described second lens 620 is N2, and its relational expression is: N2-N1=0.11.

Among the 6th embodiment, the center thickness of described first lens 610 is CT1, and the center thickness of described second lens 620 is CT2, and its relational expression is: CT1/CT2=0.75.

Among the 6th embodiment, the thing side surface 611 of described first lens 610 is respectively R1 and R2 with the radius-of-curvature as side surface 612, and its relational expression is: R1/R2=0.53.

Among the 6th embodiment, the whole focal length of this slim photographic lens group is f, and thing side surface 621 radius-of-curvature of described second lens 620 are R3, and its relational expression is: R3/f=-0.69.

Among the 6th embodiment, the whole focal length of this slim photographic lens group is f, and the focal length of described second lens 620 is f2, and its relational expression is: f/f2=-0.225.

Among the 6th embodiment, described second lens 620 the distance on 650 is Bf to imaging surface 690 in optical axis as side surface 622, the center thickness of these second lens 620 is CT2, its relational expression is: Bf/CT2=0.96.

Among the 6th embodiment, the distance on 650 is SL to described aperture 600 to imaging surface 690 in optical axis, and the distance on 650 is TTL to the thing side surface 611 of described first lens 610 to imaging surface 690 in optical axis, and its relational expression is: SL/TTL=0.74.

Among the 6th embodiment, distance on 650 is TTL to the thing side surface 611 of described first lens 610 to imaging surface 690 in optical axis, this slim photographic lens group is provided with a sense electronics optical assembly (not showing on the figure) in addition in described imaging surface 690, long half of the effective picture element of this sense electronics optical assembly zone diagonal line is ImgH, and its relational expression is: TTL/ImgH=2.16.

The detailed structured data of the 6th embodiment is as shown in the table 11, and its reference wavelength is d-line 587.6nm, and aspherical surface data is as shown in the table 12, and wherein, the unit of radius-of-curvature, thickness and focal length is a millimetre (mm).

Table 11

Table 12

By Fig. 6 B as can be known, present embodiment lens imaging quality is good, and its spherical aberration is between positive and negative 0.05mm, and astigmatism is between positive and negative 0.05mm, and distortion is between positive and negative 1.5%.

What deserves to be explained is; table 1 to table 12 is depicted as the different numerical value change tables of slim each embodiment of photographic lens group of the present utility model; yet all true gained of testing of the numerical value change of each embodiment of the utility model; even use different numerical value, the product of same structure still belongs to protection category of the present utility model.Table 13 is the corresponding tables of each relational expression among each embodiment.

Table 13

?	First embodiment	Second embodiment	The 3rd embodiment	The 4th embodiment	The 5th embodiment	The 6th embodiment
							f	1.84	1.96	1.89	1.89	2.98	2.97
Fno	2.45	2.85	3.00	2.60	2.85	3.00
							HFOV	33.0	31.0	31.9	31.9	26.1	26.0
|V1-V2|	32.5	32.1	25.6	34.4	33.1	35.1
							N2-N1	0.09	0.09	0.05	0.12	0.09	0.11
CT1/CT2	0.59	0.51	0.47	0.53	0.76	0.75
							R1/R2	0.57	0.48	0.48	0.45	0.44	0.53
R3/f	-1.01	-0.61	-0.60	-0.59	-0.65	-0.69
							f/f2	-0.004	-0.272	-0.110	-0.167	-0.390	-0.225
Bf/CT2?	1.21	1.11	1.05	1.23	0.97	0.96
							SL/TTL	0.94	0.94	0.95	0.94	0.75	0.74
TTL/ImgH	1.71	1.75	1.75	1.75	2.13	2.16

In the slim photographic lens group of the present utility model, the material of each lens is glass or plastics, if the material of at least one lens is a glass, then can increase the degree of freedom of this slim photographic lens group refracting power configuration, if the material of at least one lens is plastics, then can effectively reduce production costs.In addition, on the minute surface aspheric surface can be set, aspheric surface is made into the shape beyond the sphere easily, obtain more control variable, in order to subduing aberration, and then the number that uses of reduction lens, therefore can effectively reduce the total length of the slim photographic lens group of the utility model.

In the slim photographic lens group of the utility model,, represent that then this 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 this lens surface is a concave surface in paraxial place.

In the slim photographic lens group of the utility model, at least one diaphragm (as credit light diaphragm) can be set on demand, help to promote the quality of image to reduce parasitic light.

?[0467]

Claims (23)

1. a slim photographic lens group is characterized in that, is extremely comprised in regular turn as side by the thing side:

First lens of the positive refracting power of one tool, its thing side surface are convex surface, be concave surface as side surface, this thing side surface and picture side surface one side at least are aspheric surface;

Second lens of the negative refracting power of one tool, its thing side surface are concave surface, be convex surface as side surface, this thing side surface and picture side surface one side at least are aspheric surface;

The lens of tool refracting power are two in this slim photographic lens group, and the abbe number of described first lens is V1, the abbe number of described second lens is V2, the whole focal length of this slim photographic lens group is f, the focal length of described second lens is f2, the thing side surface radius-of-curvature of these second lens is R3, in addition, this slim photographic lens group is provided with an aperture in addition, this aperture to the distance of imaging surface on optical axis is SL, the thing side surface of described first lens to the distance of imaging surface on optical axis is TTL, satisfies the following relationship formula:

15＜|V1-V2|＜48；

-0.43＜f/f2＜0；

-1.50＜R3/f＜-0.40；

0.9＜SL/TTL＜1.1。

2. slim photographic lens group as claimed in claim 1, it is characterized in that: the material of described first lens is plastics, and its thing side surface be all aspheric surface as side surface, the material of described second lens is plastics, and its thing side surface be all aspheric surface as side surface.

3. slim photographic lens group as claimed in claim 2 is characterized in that: the thing side surface of described first lens be respectively R1 and R2 as the radius-of-curvature of side surface, both satisfy following relationship formula: 0＜R1/R2＜0.8.

4. slim photographic lens group as claimed in claim 3 is characterized in that: the abbe number of described first lens is V1, and the abbe number of described second lens is V2, and both satisfy the following relationship formula: 23＜| V1-V2|＜45.

5. slim photographic lens group as claimed in claim 4 is characterized in that: the abbe number of described first lens is V1, and the abbe number of described second lens is V2, and both satisfy the following relationship formula: 30＜| V1-V2|＜42.

6. slim photographic lens group as claimed in claim 3 is characterized in that: the whole focal length of this slim photographic lens group is f, and the focal length of described second lens is f2, and both satisfy following relationship formula :-0.27＜f/f2＜0.

7. slim photographic lens group as claimed in claim 3 is characterized in that: the whole focal length of this slim photographic lens group is f, and the thing side surface radius-of-curvature of described second lens is R3, and both satisfy following relationship formula :-1.20＜R3/f＜-0.50.

8. slim photographic lens group as claimed in claim 3 is characterized in that: the center thickness of described first lens is CT1, and the center thickness of described second lens is CT2, and both satisfy following relationship formula: 0.25＜CT1/CT2＜0.95.

9. slim photographic lens group as claimed in claim 8 is characterized in that: the center thickness of described first lens is CT1, and the center thickness of described second lens is CT2, and both satisfy following relationship formula: 0.40＜CT1/CT2＜0.76.

10. slim photographic lens group as claimed in claim 3 is characterized in that: the refractive index of described first lens is N1, and the refractive index of described second lens is N2, and both satisfy following relationship formula: 0.04＜N2-N1＜0.18.

11. slim photographic lens group as claimed in claim 3, it is characterized in that: described second lens be Bf as side surface to the distance of imaging surface on optical axis, the center thickness of described second lens is CT2, and both satisfy following relationship formula: 0.95＜Bf/CT2＜1.65.

12. slim photographic lens group as claimed in claim 3 is characterized in that: the thing side surface of described first lens be respectively R1 and R2 as the radius-of-curvature of side surface, both satisfy following relationship formula: 0.40＜R1/R2＜0.60.

13. slim photographic lens group as claimed in claim 3, it is characterized in that: the thing side surface of described first lens to the distance of imaging surface on optical axis is TTL, in this imaging surface one sense electronics optical assembly is set in addition, long half of the effective picture element of this sense electronics optical assembly zone diagonal line is ImgH, and both satisfy following relationship formula: TTL/ImgH＜1.95.

14. a slim photographic lens group is characterized in that, is extremely comprised in regular turn as side by the thing side:

First lens of the positive refracting power of one tool, its thing side surface are convex surface, be concave surface as side surface, this thing side surface be all aspheric surface as side surface, these first lens are plastics;

Second lens of the negative refracting power of one tool, its thing side surface are concave surface, be convex surface as side surface, this thing side surface be all aspheric surface as side surface, these second lens are plastics;

The lens of tool refracting power are two in this slim photographic lens group, and the abbe number of described first lens is V1, the abbe number of described second lens is V2, the whole focal length of this slimming photographic lens group is f, and the focal length of described second lens is f2, and the refractive index of described first lens is N1, the refractive index of described second lens is N2, these second lens be Bf as side surface to the distance of imaging surface on optical axis, the center thickness of these second lens is CT2, satisfies the following relationship formula:

15＜|V1-V2|＜48；

-0.43＜f/f2＜0；

N2＞N1；

0.4＜Bf/CT2＜2.0。

15. slim photographic lens group as claimed in claim 14 is characterized in that: the whole focal length of this slim photographic lens group is f, the thing side surface radius-of-curvature of described second lens is R3, and both satisfy following relationship formula :-1.50＜R3/f＜-0.40.

16. slim photographic lens group as claimed in claim 15 is characterized in that: the refractive index of described first lens is N1, the refractive index of described second lens is N2, and both satisfy following relationship formula: 0.04＜N2-N1＜0.18.

17. slim photographic lens group as claimed in claim 15, it is characterized in that: described second lens be Bf as side surface to the distance of imaging surface on optical axis, the center thickness of these second lens is CT2, and both satisfy following relationship formula: 0.95＜Bf/CT2＜1.65.

18. slim photographic lens group as claimed in claim 17, it is characterized in that: this slim photographic lens group is provided with an aperture in addition, this aperture to the distance of imaging surface on optical axis is SL, the thing side surface of described first lens to the distance of imaging surface on optical axis is TTL, satisfies following relationship formula: 0.9＜SL/TTL＜1.1.

19. slim photographic lens group as claimed in claim 18 is characterized in that: the abbe number of described first lens is V1, the abbe number of described second lens is V2, and both satisfy the following relationship formula: 30＜| V1-V2|＜42.

20. slim photographic lens group as claimed in claim 17 is characterized in that: the whole focal length of this slim photographic lens group is f, the focal length of described second lens is f2, and both satisfy following relationship formula :-0.27＜f/f2＜0.

21. slim photographic lens group as claimed in claim 17 is characterized in that: the whole focal length of this slim photographic lens group is f, the thing side surface radius-of-curvature of described second lens is R3, and both satisfy following relationship formula :-1.20＜R3/f＜-0.50.

22. slim photographic lens group as claimed in claim 17 is characterized in that: the center thickness of described first lens is CT1, the center thickness of described second lens is CT2, and both satisfy following relationship formula: 0.40＜CT1/CT2＜0.76.

23. slim photographic lens group as claimed in claim 17 is characterized in that: the thing side surface of described first lens be respectively R1 and R2 as the radius-of-curvature of side surface, both satisfy following relationship formula: 0.40＜R1/R2＜0.60.

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