CN202305971U - Optical lens component - Google Patents

Abstract

The utility model relates to an optical lens component. The optical lens component comprises a lens group. The lens group comprises a fixing lens screen, a first lens, a second lens, a third lens and a fourth lens, which are coaxial and are sequentially arranged from an object to an image; the first lens has positive dioptre and comprises a first surface convex to the object and a second surface convex to the image; the second lens has negative dioptre and comprises a third surface convex to the object and a fourth surface concave to the image; the third lens has positive dioptre and comprises a fifth surface concave to the object and a sixth surface convex to the image; the fourth lens has negative dioptr and comprises a seventh surface convex to the object and an eighth surface concave to the image; and the focus of the lens group satisfies certain conditions. Through the configuration of the lens structure, the arrangement way and the lens group focus, the total length of a lens system can be effectively shortened, various image differences can be well corrected, and better optical performance is achieved.

Description

A kind of optical lens assembly

Technical field

The utility model relates to optical device, is specifically related to a kind of optical lens assembly.

Background technology

In digital image-forming equipment, the optical imagery camera lens is particularly important assembly, and the picture element of camera lens has directly determined the imaging performance of digital image-forming equipment.Along with progress of science and technology, the small-sized image pickup module also is tending towards to high pixel development, thereby the optical lens that is provided in the digital image-forming equipment has been had increasingly high requirement.The compact requirement of digital product also forces lens design constantly to pursue shorter optics length overall simultaneously.In sum, the development of digital product at present requires lens design not only will take into account simultaneously and reduce the camera lens height and obtain optical property preferably, and industrial large quantities of volume productions also requires lens design to reduce production costs as much as possible, possess good processability.

The utility model content

The utility model technical matters to be solved is the deficiency that overcomes prior art, and a kind of effectively correcting various aberrations is provided, and obtains optical property preferably, the optical lens assembly of simultaneously effective reduction system overall height.

For solving the problems of the technologies described above, the utility model provides following technical scheme:

A kind of optical lens assembly; Comprise lens combination, it is coaxial and be arranged in order from object space to picture side that said lens combination comprises: have second lens bearing dioptric first lens, have positive diopter, have the 4th lens of bearing dioptric the 3rd lens and having positive diopter;

Said first lens comprise protruding in the first surface of object space and the second surface that caves in respect to picture side;

Said second lens comprise protruding the 3rd surface and protruding the 4th surface to picture side to object space;

Said the 3rd lens comprise the 5th surface and protruding the 6th surface to picture side with respect to the object space depression;

Said the 4th lens comprise protruding in the 7th surface of object space and the 8th surface of caving in respect to picture side;

And said lens combination meets the following conditions:

f ₁＜0, and 1＜| f ₁/ f|＜1.2;

0＜f ₂, and 0.4＜f ₂/ f＜0.5;

0.8＜f _1，2/f＜1；

1.15＜L/f＜1.3；

Wherein f is the effective focal length value of whole optical lens assembly; L is system's length overall of optical lens assembly; f ₁It is the effective focal length value of first lens; f ₂It is the effective focal length value of second lens; f _1,2It is the synthetic focal length value of first lens and second lens.

Further, said the 7th surface and/or the 8th surface are provided with the point of inflexion.

Further, said optical lens assembly also comprises fixed aperture, and said fixed aperture is positioned at the first surface of first lens.

Further, said optical lens assembly also comprises optical filter, and said optical filter is the sheet glass that at least one light transmitting surface is coated with infrared cut-off light filtering films, and said optical filter is positioned at the back of the 4th lens.

Further, the refractive index of said first lens and the 3rd lens is 1.585, and dispersion values is 29.5.

Further, the refractive index of said second lens and the 4th lens is 1.53, and dispersion values is 56.

Further, said first surface, second surface, the 3rd surface, the 4th surface, the 5th surface, the 6th surface, the 7th surface, the 8th surface are aspheric surface and satisfy following formula:

$z=\frac{{\mathrm{<figure-callout\; id="2"\; label="cr"\; filenames="HDA0000102797570000031.png"\; state="\{\{state\}\}">cr</figure-callout>}}^2}{1+\sqrt{1-(1+k)c^2{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HDA0000102797570000031.png"\; state="\{\{state\}\}">r</figure-callout>}}^2}}+a_1{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HDA0000102797570000031.png"\; state="\{\{state\}\}">r</figure-callout>}}^2+a_2{r}^4+a_3{r}^6+a_4{r}^8+a_5{r}^{10}+a_6{r}^{12}$

Wherein: Z is for being starting point with each aspheric surface and optical axes crosspoint, the axial axial value of vertical light, and k is the quadric surface coefficient, c is the minute surface curvature of centre, c=1/R, wherein R is a minute surface curvature of centre radius, r is the minute surface centre-height; a ₁, a ₂, a ₃, a ₄, a ₅, a ₆Be asphericity coefficient.

Four lens of the lens combination of the optical lens assembly of the utility model adopt negative, positive, negative, positive diopter combinations; And to the qualification of the relation between each lens effective focal length value; Further shortened the length overall of camera lens; And, carry out good rectification to each aberration, can obtain higher quality of optical imaging.

Description of drawings

Fig. 1 is the optical assembly structure synoptic diagram of the utility model optical lens assembly embodiment one.

Fig. 2 is MTF (optical transfer function) figure of embodiment two optical lens assemblies.

Fig. 3 is the spherical aberration figure of embodiment two optical lens assemblies.

Fig. 4 is the illumination figure of embodiment two optical lens assemblies.

Fig. 5 is the MTF figure of embodiment three optical lens assemblies.

Fig. 6 is the spherical aberration figure of embodiment three optical lens assemblies.

Fig. 7 is the illumination figure of embodiment three optical lens assemblies.

Fig. 8 is the MTF figure of embodiment four optical lens assemblies.

Fig. 9 is the spherical aberration figure of embodiment four optical lens assemblies.

Figure 10 is the illumination figure of embodiment four optical lens assemblies.

Embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

Embodiment one:

A kind of optical lens assembly that the utility model embodiment provides; Comprise lens combination, it is coaxial and be arranged in order from object space to picture side that lens combination comprises: have second lens 2 bearing dioptric first lens 1, have positive diopter, have the 4th lens 4 of bearing dioptric the 3rd lens 3 and having positive diopter;

Said first lens 1 comprise protruding in the first surface 11 of object space and the second surface 12 that caves in respect to picture side;

Said second lens 2 comprise protruding the 3rd surface 21 and protruding the 4th surface 22 to picture side to object space;

Said the 3rd lens 3 comprise the 5th surface 31 and protruding the 6th surface 32 to picture side with respect to the object space depression;

Said the 4th lens 4 comprise protruding to the 7th surface 41 of object space with respect to the 8th surperficial 42 of picture side's depression;

And said lens combination meets the following conditions:

f ₁＜0, and 1＜| f ₁/ f|＜1.2;

0＜f ₂, and 0.4＜f ₂/ f＜0.5;

0.8＜f _1，2/f＜1；

1.15＜L/f＜1.3；

Wherein f is the effective focal length value of whole optical lens assembly; L is system's length overall of optical lens assembly; f ₁It is the effective focal length value of first lens 1; f ₂It is the effective focal length value of second lens 2; f _1,2It is the synthetic focal length value of first lens and 1 second lens 2.The qualification of the relation between system's length overall of optical lens assembly and each the lens effective focal length value has further been shortened the length overall of camera lens, and to each aberration, has been carried out good rectification, has obtained optical property preferably.

In the present embodiment, the 41 and/or the 8th surface, the 7th surface 42 is provided with the point of inflexion, can reduce system's chief ray emergence angle, increases image planes brightness, adopts this combination can favourable shortening length overall simultaneously; And make off-axis aberration obtain well-corrected.

The optical lens assembly of the utility model embodiment also comprises fixed aperture (among the figure indicate), is used to control the luminous flux of scioptics group, said fixed aperture, is arranged on the first surface 11 of first lens 1.Said lens combination promptly also is provided with optical filter 5 in the zone, picture side of the 4th lens 4 back at the back; Optical filter 5 is a glass plate; At least one light transmitting surface plating of glass plate infrared cut-off light filtering films (IR-cut Coating); Come from the IR in the object reflection ray with filtering, thereby improve image quality.

As concrete embodiment, the material of said first lens 1 is PC, and refractive index and chromatic dispersion are divided into n2=1.585, and v2=29.5, the material of second lens 2 are ZEONEX, and refractive index and chromatic dispersion are respectively n1=1.53, v1=56; The material of its 3rd lens 3 is PC, and refractive index and chromatic dispersion are divided into n2=1.585, v2=29.5; The material of its 4th lens 4 is ZEONEX, and refractive index and chromatic dispersion are respectively n1=1.53, v1=56.More than two plastic material less expensive in the optics plastic rubber material, stable performance reduces cost thereby reached optical lens assembly, guarantees the requirement of high image quality.

In the present embodiment, said first surface, second surface, the 3rd surface, the 4th surface, the 5th surface, the 6th surface, the 7th surface, the 8th surface are aspheric surface and satisfy following formula:

$z=\frac{{\mathrm{<figure-callout\; id="2"\; label="cr"\; filenames="HDA0000102797570000031.png"\; state="\{\{state\}\}">cr</figure-callout>}}^2}{1+\sqrt{1-(1+k)c^2{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HDA0000102797570000031.png"\; state="\{\{state\}\}">r</figure-callout>}}^2}}+a_1{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HDA0000102797570000031.png"\; state="\{\{state\}\}">r</figure-callout>}}^2+a_2{r}^4+a_3{r}^6+a_4{r}^8+a_5{r}^{10}+a_6{r}^{12}$

Wherein: Z is for being starting point with each aspheric surface and optical axes crosspoint, the axial axial value of vertical light, and k is the quadric surface coefficient, c is the minute surface curvature of centre, c=1/R, wherein R is a minute surface curvature of centre radius, r is the minute surface centre-height; a ₁, a ₂, a ₃, a ₄, a ₅, a ₆Be asphericity coefficient.Can know through above-mentioned aspheric surface formula, have or not array parameter just can obtain numerous aspheric surface.As long as four groups of four corresponding aspheric surfaces of parameter are formed two lens each other, satisfy the required condition of said lens group, be the lens that the utility model provides.Again through two embodiment, two parts of parameters are provided, below so that the technician can more clearly know the advantage of the utility model.

Above-mentioned optical lens assembly; It adopts aspheric surface and plastic material design fully; And employed plastic material is cheap optics plastic rubber material in the design, when satisfying the high-performance image quality, has stable performance, less cost, the facility of smaller volume and processing.

Embodiment two:

Second embodiment that the utility model provided, on the basis of embodiment one, the correlation parameter that has further proposed lens assembly is following:

Lens parameter:

Type	Radius-of-curvature (R)	Quadric surface coefficient (k)	Thickness (dmm)
				First surface	1.544934	-1.187450	0.319932
Second surface	0.879542	-1.532935	0.049898
				The 3rd surface	1.529383	-1.797015	0.664323
The 4th surface	-8.12137	6.879667	0.672265
				The 5th surface	-0.776586	-1.283295	0.320065
The 6th surface	-1.042676	-1.435293	0.200645
				The 7th surface	1.469834	-7.798169	0.639671
The 8th surface	1.044023	-2.981657	0.315
				The optical filter front surface	-	0	0.3
Surface behind the optical filter	-	0	1.075524
				Image planes	-	-	-

Asphericity coefficient:

In the table thickness d for this reason identity distance from next distance, the length overall L=4.5mm of this camera lens module, effective focal length value f=3.63mm, the effective focal length value f of first lens ₁=-4.2411mm, the effective focal length value f of second lens ₂=1.7212mm.

Fig. 2 is modulation transfer function (ModulationTransfer Function the is called for short MTF) curve map of the optical lens assembly of the utility model embodiment one, transverse axis representation space frequency among the figure, and unit: line is to every millimeter (1p/mm); The longitudinal axis is represented the numerical value of modulation transfer function (MTF), and the numerical value of said MTF is used for estimating the image quality of camera lens, and span is 0-1, and the MTF curve is high more representes that more directly the image quality of camera lens is good more, strong more to the reducing power of true picture.As can beappreciated from fig. 2; The MTF curve of each visual field meridian direction (T) and sagitta of arc direction (S) direction very near; It shows: this lens assembly is in each visual field; The imaging performance of meridian direction (T) and this both direction of sagitta of arc direction (S) has good consistance, can guarantee that lens assembly can both blur-free imaging on whole imaging surface, and clear, ill-defined situation in the middle of can not occurring.

Fig. 3 and Fig. 4 are respectively the spherical aberration and the illumination figure of the optical lens assembly of the utility model embodiment one, can find out from Fig. 3 and Fig. 4, and the spherical aberration of this optical lens assembly is less than 0.020mm, illumination＞50%; Can satisfy high brightness, correct, obtain desirable optical property respectively differing better.

Embodiment three:

The 3rd embodiment that the utility model provided, on the basis of embodiment one, the correlation parameter that has further proposed lens assembly is following:

Lens parameter:

Type	Radius-of-curvature (R)	Quadric surface coefficient (k)	Thickness (dmm)
				First surface	1.636078	-1.483331	0.319996
Second surface	0.877712	-1.581842	0.042906
				The 3rd surface	1.524758	-2.073912	0.640057
The 4th surface	-6.145956	-8.003289	0.703913
				The 5th surface	-0.812817	-1.373006	0.342117

The 6th surface	-1.115978	-1.314580	0.227157
				The 7th surface	1.426528	-8.212905	0.721287
The 8th surface	0.993989	-2.954569	0.315
				The optical filter front surface	-	0	0.3
Surface behind the optical filter	-	0	0.949303
				Image planes	-	-	-

Asphericity coefficient:

Type	a 1	a 2	a 3	a 4	a 5	a 6
							First surface	0	-0.124656	-9.4674e-3	0.103372	-0.140286	0
Second surface	0	-0.313772	0.092540	0.131639	-0.301522	0
							The 3rd surface	0.186728	-0.185938	0.109030	0.094075	-0.084686	-0.030068
The 4th surface	0	-0.014638	0.056774	0.077912	0	0
							The 5th surface	-0.067775	0.235585	-0.286031	0.713563	-0.812007	0.323173
The 6th surface	-0.032484	0.036576	0.196358	-0.044696	-0.015134	-2.451124e-5
							The 7th surface	4.171040e-3	-0.041101	0.011650	-2.922577e-3	3.384387e-4	-4.132308e-5
The 8th surface	-0.172955	-5.132052e-3	-1.74438e-3	-2.207213e-4	3.374292e-5	-1.64639e-5

In the table thickness d for this reason identity distance from next distance, the length overall L=4.55mm of this camera lens module, effective focal length value f=3.60mm, the effective focal length value f of first lens ₁=-3.8312mm, the effective focal length value f of second lens ₂=1.6499mm.

Fig. 5 is modulation transfer function (ModulationTransfer Function the is called for short MTF) curve map of the optical lens assembly of the utility model embodiment two, transverse axis representation space frequency among the figure, and unit: line is to every millimeter (1p/mm); The longitudinal axis is represented the numerical value of modulation transfer function (MTF), and the numerical value of said MTF is used for estimating the image quality of camera lens, and span is 0-1, and the MTF curve is high more representes that more directly the image quality of camera lens is good more, strong more to the reducing power of true picture.As can beappreciated from fig. 5; The MTF curve of each visual field meridian direction (T) and sagitta of arc direction (S) direction very near; It shows: this lens assembly is in each visual field; The imaging performance of meridian direction (T) and this both direction of sagitta of arc direction (S) has good consistance, can guarantee that lens assembly can both blur-free imaging on whole imaging surface, and clear, ill-defined situation in the middle of can not occurring.

Fig. 6 and Fig. 7 are respectively the spherical aberration and the illumination figure of the optical lens assembly of the utility model embodiment one, can find out from Fig. 6 and Fig. 7, and the spherical aberration of this optical lens assembly is less than 0.020mm, illumination＞50%; Can satisfy high brightness, correct, obtain desirable optical property respectively differing better.

Embodiment four:

The 4th embodiment that the utility model provided, on the basis of embodiment one, the correlation parameter that has further proposed lens assembly is following:

Lens parameter:

Type	Radius-of-curvature (R)	Quadric surface coefficient (k)	Thickness (dmm)
				First surface	1.501350	-1.081449	0.319997
Second surface	0.846607	-1.277041	0.042005
				The 3rd surface	1.645558	-1.268989	0.66418
The 4th surface	-3.719963	1.848828	0.683532
				The 5th surface	-0.752718	-1.345733	0.32
The 6th surface	-1.000182	-1.068439	0.221582
				The 7th surface	1.622582	-9.680612	0.76495
The 8th surface	1.184420	-3.681344	0.315
				The optical filter front surface	-	0	0.3
Surface behind the optical filter	-	0	0.9
				Image planes	-	-	-

Asphericity coefficient:

Type	a 1	a 2	a 3	a 4	a 5	a 6
							First surface	0	-0.166450	0.024979	0.048935	-0.115792	0
Second surface	0	-0.349786	0.105935	0.233935	-0.488312	0
							The 3rd surface	0.176978	-0.194389	0.076834	0.094071	-0.051261	-0.129747
The 4th surface	0	-0.031949	-0.029871	0.134168	0	0
							The 5th surface	-0.047361	0.157699	-0.226569	0.653688	-0.713266	0.236925
The 6th surface	-0.013599	0.046106	0.179464	-0.038921	-0.016874	-1.058712e-3
							The 7th surface	-0.033039	-0.059278	5.453899e-3	-4.788505e-3	-5.556471e-4	-5.215364e-4
The 8th surface	-0.148917	-0.018068	-3.609536e-3	-5.747643e-4	-5.900317e-5	-2.58046e-5

In the table thickness d for this reason identity distance from next distance, the length overall L=4.53mm of this camera lens module, effective focal length value f=3.60mm, the effective focal length value f of first lens ₁=-4.046mm, the effective focal length value f of second lens ₂=1.627mm.

Fig. 8 is modulation transfer function (ModulationTransfer Function the is called for short MTF) curve map of the optical lens assembly of the utility model embodiment one, transverse axis representation space frequency among the figure, and unit: line is to every millimeter (1p/mm); The longitudinal axis is represented the numerical value of modulation transfer function (MTF), and the numerical value of said MTF is used for estimating the image quality of camera lens, and span is 0-1, and the MTF curve is high more representes that more directly the image quality of camera lens is good more, strong more to the reducing power of true picture.As can beappreciated from fig. 8; The MTF curve of each visual field meridian direction (T) and sagitta of arc direction (S) direction very near; It shows: this lens assembly is in each visual field; The imaging performance of meridian direction (T) and this both direction of sagitta of arc direction (S) has good consistance, can guarantee that lens assembly can both blur-free imaging on whole imaging surface, and clear, ill-defined situation in the middle of can not occurring.

Fig. 9 and Figure 10 are respectively the spherical aberration and the illumination figure of the optical lens assembly of the utility model embodiment one, can find out from Fig. 9 and Figure 10, and the spherical aberration of this optical lens assembly is less than 0.020mm, illumination＞50%; Can satisfy high brightness, correct, obtain desirable optical property respectively differing better.

In sum, the optical lens assembly that the utility model embodiment provides can shorten the lens system length overall effectively, makes various aberrations obtain well-corrected, and obtains optical property preferably.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.

Claims (7)

1. optical lens assembly; Comprise lens combination; It is characterized in that it is coaxial and be arranged in order from object space to picture side that said lens combination comprises: have second lens bearing dioptric first lens, have positive diopter, have the 4th lens of bearing dioptric the 3rd lens and having positive diopter;

Said first lens comprise protruding in the first surface of object space and the second surface that caves in respect to picture side;

Said second lens comprise protruding the 3rd surface and protruding the 4th surface to picture side to object space;

Said the 3rd lens comprise the 5th surface and protruding the 6th surface to picture side with respect to the object space depression;

Said the 4th lens comprise protruding in the 7th surface of object space and the 8th surface of caving in respect to picture side;

And said lens combination meets the following conditions:

f ₁＜0, and 1＜| f ₁/ f|＜1.2;

0＜f ₂, and 0.4＜f ₂/ f＜0.5;

0.8＜f _1，2/f＜1；

1.15＜L/f＜1.3；

Wherein f is the effective focal length value of whole optical lens assembly; L is system's length overall of optical lens assembly; f ₁It is the effective focal length value of first lens; f ₂It is the effective focal length value of second lens; f _1,2It is the synthetic focal length value of first lens and second lens.

2. according to the said optical lens assembly of claim 1, it is characterized in that said the 7th surface and/or the 8th surface are provided with the point of inflexion.

3. according to the said optical lens assembly of claim 1, it is characterized in that also comprise fixed aperture, said fixed aperture is positioned at the first surface of first lens.

4. according to the said optical lens assembly of claim 1, it is characterized in that, also comprise optical filter, said optical filter is the sheet glass that at least one light transmitting surface is coated with infrared cut-off light filtering films, and said optical filter is positioned at the back of the 4th lens.

5. according to the said optical lens assembly of claim 1, it is characterized in that the refractive index of said first lens and the 3rd lens is 1.585, dispersion values is 29.5.

6. according to the said optical lens assembly of claim 1, it is characterized in that the refractive index of said second lens and the 4th lens is 1.53, dispersion values is 56.

7. according to each said optical lens assembly of claim 1 to 6; It is characterized in that said first surface, second surface, the 3rd surface, the 4th surface, the 5th surface, the 6th surface, the 7th surface, the 8th surface are aspheric surface and satisfy following formula:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-(1+k)c^2{r}^2}}+a_1{r}^2+a_2{r}^4+a_3{r}^6+a_4{r}^8+a_5{r}^{10}+a_6{r}^{12}$

Wherein: Z is for being starting point with each aspheric surface and optical axes crosspoint, the axial axial value of vertical light, and k is the quadric surface coefficient, c is the minute surface curvature of centre, c=1/R, wherein R is a minute surface curvature of centre radius, r is the minute surface centre-height; a ₁, a ₂, a ₃, a ₄, a ₅, a ₆Be asphericity coefficient.

Images