CN101881876A - Micro pick-up lens - Google Patents

Abstract

The invention discloses a micro pick-up lens, which comprises two non-spherical lenses and a light diaphragm, wherein the diopter of each lens is positive and negative in turn; the lenses satisfy the following expression: VP1 is more than 50 and VP2 is less than 35; and in the expression, the VP1 and the VP2 are abbe numbers of the first lens and the second lens respectively. The micro pick-up lens adopts two sets of the non-spherical lenses, and with the help of reasonable optical parameters, improves the image resolving power of the whole set of the lenses, ensures that the lenses have excellent imaging quality and realizes that the two non-spherical lenses meet the imaging requirement of reaching a 2M high pixel. The micro pick-up lens greatly reduces the cost and obtains a better technical effect.

Description

A kind of micro pick-up lens

Technical field

The present invention relates to a kind of imaging optical system of camera lens, relate to a kind of high pixel camera lens of forming by two groups of lens of micro-low cost specifically.

Background technology

More and more fierce along with the mobile lens market competition, micro pick-up lens has obtained more research and development in prior art, and that the price of lens also becomes is more and more lower, on market (especially Japan) at present, and pick-up lens more and more becomes the main force and has competitive power cheaply.

Traditional phtographic lens is made up of spherical lens, design and process very convenient, suitable a large amount of production, and cost is lower, but this kind design only has a radius-of-curvature as variable element, therefore can only the various aberrations of limited elimination, limited further developing of camera lens.If pick-up lens uses non-spherical lens, can aberration correction be become easily by more parameter decision face shape, picture element might be improved.But,, always be a problem that will solve in the lens design how using the least possible lens to reach better optical effect.

In addition, because existing micro pick-up lens, if realize the imaging requirements of the high pixel of 2M, all adopted the eyeglass of three above non-spherical lenses, the pick-up lens production cost of this kind design is than higher and do not have a competitive edge.

Summary of the invention

The present invention must use the shortcoming of the eyeglass of three above non-spherical lenses in order to overcome in the prior art in order to reach the imaging requirements of high pixel, has adopted two non-spherical lenses to reach high pixel imaging requirements.Its concrete technical scheme is as following description:

A kind of micro pick-up lens comprises two non-spherical lenses and diaphragm, and the diopter of each lens is followed successively by positive and negative, and wherein, described lens satisfy following expression formula:

VP1＞50 and

VP2＜35；

In the formula, VP1 and VP2 are respectively the Abbe number of first lens and second lens.

Further, preferred construction is that described diaphragm is arranged between first lens and second lens.

Further, preferred construction is that described lens satisfy following relational expression:

1.5＜|f2/f1|＜6；

In the formula, f1 is the focal length of first lens;

F2 is the focal length of second lens.

Further, preferred construction is that described first lens are meniscus shaped lens;

Described second lens are meniscus shaped lens.

Further, preferred construction is that the convex surface of described first lens is towards object space;

The convex surface of described second lens is towards picture side.

Micro pick-up lens of the present invention, adopted two groups of non-spherical lenses,, improved the resolving power of whole set of shots by means of rational optical parametric, guaranteed that camera lens has good image quality, and realized that two aspherical lens reach the imaging requirements of the high pixel of 2M.Reduce cost greatly, obtained better technical effect.

Description of drawings

By the description of its exemplary embodiment being carried out below in conjunction with accompanying drawing, the above-mentioned feature and advantage of the present invention will become apparent and understand easily.

Fig. 1 is the concrete structure synoptic diagram of micro pick-up lens involved in the present invention;

Fig. 2 is that the axle of micro pick-up lens involved in the present invention is gone up chromaticity difference diagram;

Fig. 3 is the astigmatism figure of micro pick-up lens involved in the present invention;

Fig. 4 is the distortion figure of micro pick-up lens involved in the present invention;

The ratio chromatism, figure of the micro pick-up lens that Fig. 5 is involved in the present invention.

Embodiment

Below, be described with reference to the accompanying drawings the embodiment that the present invention relates to.

At first; Fig. 1 is the concrete structure synoptic diagram of micro pick-up lens involved in the present invention; as shown in the figure; described micro pick-up lens comprises two non-spherical lenses; and; be followed successively by from the object plane to image planes along optical axis, have positive diopter the first lens E1, diaphragm E3, have the negative dioptric second lens E2, optical filter E4, chip cover glass E5 and imaging surface E6.

Specifically the shape to lens is described, and the male and female face lens that described first lens are falcate, convex surface are towards object space, and concave surface is towards picture side, and second lens are the male and fomale(M﹠F) lens of falcate, and concave surface is towards object space, and convex surface is towards picture side.

To take two non-spherical lenses also can reach the image quality of optical effect, the whole group of raising pick-up lens preferably in order reaching, to reduce the appearance of the defective of various aberrations.In this specific embodiment, be to utilize the Abbe number of the control first lens E1 and the second lens E2 next accomplished, specifically, the control Abbe number satisfies following expression formula:

VP1＞50; And

VP2＜35；

In the formula, VP1 and VP2 are respectively the Abbe number of first lens and second lens.In specific embodiment, the numerical value of the Abbe number that we adopt is: VP1=56.1, and VP2=23.4, above-mentioned parameter designing can reduce the influence of aberration fully, improves image quality.

In addition, we need control location of aperture, to reach better optical effect.Among embodiment, diaphragm E4 is controlled between the first lens E1 and the second lens E2, in conjunction with above-mentioned two non-spherical lenses, can reduce ratio chromatism, further.

Parameter to lens further designs, and among the embodiment, lens is satisfied following expression formula:

1.5＜|f2/f1|＜6；

In the formula, f1 is first focal length of lens;

F2 is second focal length of lens;

Adopt this kind design, can improve image quality further.Among the embodiment, the focal distance f 2 that the focal distance f 1 of first lens is elected 2.0967, the second lens as is-4.6198, and the focal distance f of whole lens is 3.05, the expression formula above this kind design parameter satisfies.

Be described below with reference to the technique effect of chart, so that above-mentioned feature and advantage of the present invention are clear more and understanding easily foregoing invention.

What table 1, table 2 were listed is the correlation parameter of the lens of a specific embodiment of the present invention, comprises surface type, the radius-of-curvature of lens face, also has thickness, material, effective diameter and the circular cone coefficient of each lens.

Parallel from object space one side along optical axis, with each lens number consecutively, the minute surface of the first lens E1 is S1, S2; the diaphragm face is S3, and the minute surface of the second lens E2 is S4, S5, and the minute surface of optical filter E4 is S6, S7; the face of chip cover glass E5 is S8, S9, and S10 is imaging plane E6.Systematic parameter: 1/5 " sensor devices f-number 2.8

Table 1

Face sequence number S	Surface type	Radius of curvature R	Thickness D	Material	Effective diameter D	The circular cone COEFFICIENT K
							Object plane	Sphere	Infinite	Infinite	?	Infinite	?
??S1	Aspheric surface	??0.8131	??0.625	??1.544/56.1	??1.40	??-0.2545
							??S2	Aspheric surface	??2.0394	??0.0604	?	??0.85	??-151.6935
S3 (diaphragm)	Sphere	Infinite	??0.4521	?	??0.75	?
							??S4	Aspheric surface	??-1.7374	??1.30	??1.632/23.4	??1.10	??3.7072
??S5	Aspheric surface	??-5.4544	??0.05	?	??2.64	??6.2346
							??S6	Sphere	Infinite	??0.20	??1.517/64.2	??3.70	?
??S7	Sphere	Infinite	??0.25	?	??3.70	?
							??S8	Sphere	Infinite	??0.40	??1.517/64.2	??3.70	?
??S9	Sphere	Infinite	??0.0416	?	??3.70	?
							??S10	Sphere	Infinite	??0	?	??3.64	?

Table 2 is aspheric surface high-order term coefficient A4, A6, A8, A10, the A12 to the first lens E1, the second lens E2, the 3rd lens E3, the concrete parameter of A14, A16, shown in following form:

Table 2

The face sequence number	??A4	??A6	??A8	??A10	??A12	??A14	??A16
								??S1	??9.5809E-02	??-1.3085E-01	??3.2067E-01	??9.7686E+00	??-5.9422E+01	??1.3970E+02	??-1.1171E+02
??S2	??2.3515E+00	??-2.7209E+01	??1.8977E+02	??4.4095E+02	??-1.6432E+04	??9.8641E+04	??-1.9744E+05
								??S4	??-4.9900E-01	??2.9468E-01	??8.0125E+00	??-2.5520E+02	??1.8824E+03	??-6.1399E+03	??6.8989E+03
??S5	??-1.5494E-02	??-3.0016E-01	??6.6967E-01	??-9.0622E-01	??6.8715E-01	??-2.7424E-01	??43950E-02

In addition, Fig. 2 to Fig. 5 is the optical performance curve figure corresponding to specific embodiment.Wherein, Fig. 2 is that the axle of expression micro pick-up lens involved in the present invention is gone up chromaticity difference diagram, and the meeting focus point of the light of its expression different wave length after via optical system departs from, and unit is mm;

Fig. 3 is the astigmatism curve map of expression micro pick-up lens involved in the present invention, the crooked and sagittal image surface bending of its expression meridianal image surface, and unit is mm;

Fig. 4 is the distortion figure of expression micro pick-up lens involved in the present invention, the distortion sizes values under the expression different visual angles situation, and unit is %;

Fig. 5 is the ratio chromatism, figure of expression micro pick-up lens involved in the present invention, the light of its expression different wave length via optical system after the deviation of different image heights on imaging plane, unit is μ m.

Data from above-mentioned optical performance curve figure can be analyzed discovery, and than traditional pick-up lens structure, pick-up lens of the present invention has optical effect preferably.

Micro pick-up lens of the present invention, owing to taked above-mentioned structural design, the camera design than traditional possesses preferable optical property, and has realized that two aspherical lens reach the imaging requirements of the high pixel of 2M.Reduce cost greatly, obtained better technical effect.

It should be noted that, concrete parameter in the above table only is exemplary, and the value of each lens composition radius-of-curvature, face interval and refractive index etc. are not limited to the shown value by above-mentioned each numerical value embodiment, other value can be adopted, the similar techniques effect can be reached.

Though described principle of the present invention and embodiment at micro pick-up lens above; but; under above-mentioned instruction of the present invention; those skilled in the art can carry out various improvement and distortion on the basis of the foregoing description, and these improvement or distortion drop in protection scope of the present invention.It will be understood by those skilled in the art that top specific descriptions just in order to explain purpose of the present invention, are not to be used to limit the present invention.Protection scope of the present invention is limited by claim and equivalent thereof.

Claims (5)

1. a micro pick-up lens comprises two non-spherical lenses and diaphragm, and the diopter of each lens is followed successively by positive and negative, and wherein, described lens satisfy following expression formula:

VP1＞50 and

VP2＜35；

In the formula, VP1 and VP2 are respectively the Abbe number of first lens and second lens.

2. micro pick-up lens according to claim 1 is characterized in that,

Described diaphragm is arranged between first lens and second lens.

3. micro pick-up lens according to claim 1 is characterized in that,

Described lens satisfy following relational expression:

1.5＜|f2/f1|＜6；

In the formula, f1 is the focal length of first lens;

F2 is the focal length of second lens.

4. according to the arbitrary described micro pick-up lens of claim 1～3, it is characterized in that,

Described first lens are meniscus shaped lens;

Described second lens are meniscus shaped lens.

5. micro pick-up lens according to claim 4 is characterized in that,

The convex surface of described first lens is towards object space;

The convex surface of described second lens is towards picture side.

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