CN201035206Y - Two glasses lens type optical pick-up lens - Google Patents

Abstract

The utility model relates to a dual-lens typed optical image capture lens which is arranged in sequence on the object side. The utility model comprises a positive diopter first lens part which is a crescent shaped aspheric surface lens and the convex surface of which is arranged on the object side, a positive diopter second lens part which is a crescent shaped aspheric surface lens and the convex surface of which is arranged on the image side, an infrared filter, an image sensor which are all arranged in sequence on the same optical axis. The following conditions are satisfied: 0.4f<=d<0.9f, 0.5f<=|R3|<=100f, 5<|f2|/|f1|<15 and 20<=Vd<=60. Wherein, f is the valid focal length of the image capture lens (system), d is the distance from the object side convex surface of the first lens part to the image side convex surface of the second lens part, R3 is the curvature radius of the object side concave surface of the second lens part, f1 is the valid focal length of the first lens part, f2 is the valid focal length of the second lens part and Vd is the abbe number of the first lens part and the second lens part. In this way, the image capture lens has a high resolution and the length of the lens can be effectively shortened. Therefore, the image capture lens has a small volume and a low cost and a strong practicality.

Description

Two eyeglass formula optical shooting lens

Technical field

The utility model relates to a kind of two eyeglass formula optical shooting lens, mainly be at mobile lens or use CCD (the electric charge lotus root attaches together and puts) or the camera lens of CMOS image sensors such as (complementary metal oxide semiconductor (CMOS)s), and a kind of high-performance, the total length that is made of two lens that provides is little and optical shooting lens cheaply.

Background technology

Progress along with science and technology, electronic product constantly develops towards compact and multi-functional direction, and in the electronic product as: digital camera (Digital Still Camera), computer cameras (PC camera), network cameras (Network camera), mobile phone (mobile phone) etc. possessed image-taking device (camera lens) outside, even personal digital assistance devices such as (PDA) also has the demand that adds image-taking device (camera lens); And for easy to carry with meet the demand of hommization, image-taking device not only needs to have favorable imaging quality, also need simultaneously smaller volume and lower cost, also the beginning can effectively promote the application of described image-taking device, especially be applied on the mobile phone (mobile phone), above-mentioned needs or condition are even more important.

And because the material selectivity of traditional sphere abrading glass lens is more, and aberration is comparatively favourable for revising, widely industry is used, but when sphere abrading glass lens were applied in the situation that burnt number (F number) is less and field angle (field angle) is bigger, the correction of aberrations such as spherical aberration and astigmatism was still difficult; And in order to improve the shortcoming of above-mentioned traditional sphere abrading glass lens, present image-taking device is existing to be used aspherical plastic lens or uses the aspheric surface molded glass lens, to obtain preferable image quality, as: the U.S. the 6th, 813, No. 095 " OPTICAL IMAGEPICK-UP LENS " patent of invention, the U.S. the 6th, 031, No. 670 " WIDE-ANGLE LENS " patents of invention, or TOHKEMY 2001-183578 number (P2001-183578A) " capture LENS " etc., the total length of right existing optical image-taking device (camera lens) is partly still excessive, in the lens combination as TOHKEMY P2001-183578A " capture LENS ", first of its first lens piece to second of second lens piece be more than or equal to 0.9f (d 〉=0.9f apart from d, f is the effective focal length of lens combination integral body), make sampling image lens can't have smaller size smaller or lower cost, be difficult for satisfying electronic product and make every effort to compact demand, the relative application that has also limited sampling image lens especially can't be applied on the mobile phone (mobile phone) easily.

Summary of the invention

The utility model fundamental purpose is, provides a kind of two eyeglass formula optical shooting lens (two element typeoptical imaging lens), in order to overcome above-mentioned defective.

For achieving the above object, the technical solution adopted in the utility model is, a kind of two eyeglass formula optical shooting lens are provided, arrange in regular turn by the thing side: first lens piece of a positive diopter (a first lens element ofpositive refractive power), second lens piece of one positive diopter (a second lens element ofpositive refractive power), one infrared filter and an image sensor, and with common optical axis arrangement formation, wherein, first, two lens pieces all are lunate non-spherical lenses, and the convex surface of first lens piece (convex surface) is in the thing side, and the convex surface of second lens piece is in the picture side, has high resolving power and can effectively dwindle two eyeglass formula optical shooting lens of camera lens total length to constitute one.

The utility model purpose again is to be to provide a kind of two eyeglass formula optical shooting lens (optical imaginglens), described sampling image lens meets the following conditions: 0.4f≤d＜0.9f, 0.5f≤| R3|≤100f, 5＜| f2|/| f1|＜15, with 20≤Vd≤60; Wherein, f is sampling image lens (system) effective focal length, d is the distance of the thing side convex surface of first lens piece to the picture side convex surface of second lens piece, R3 is the radius-of-curvature of the second lens piece thing side concave surface, f1 is the effective focal length of first lens piece, f2 is the effective focal length of second lens piece, with Vd be the Abbe number (Abbe ' s number) of first lens piece and second lens piece; The another purpose of the utility model is to be to provide a kind of two eyeglass formula optical shooting lens, wherein said sampling image lens can be established a preposition aperture, and the thing side convex surface (convex object-side surface) that makes its aperture diaphragm be located at first lens piece is gone up or before.

Another purpose of the utility model is to be to provide a kind of two eyeglass formula optical shooting lens, wherein said sampling image lens can be established a mid-aperture, make its aperture diaphragm be located on the picture side concave surface of first lens piece on the thing side concave surface of second lens piece or first lens piece as between the side concave surface and the second lens piece thing side concave surface.

Another purpose of the utility model is to be to provide a kind of two eyeglass formula optical shooting lens, and first lens piece and second lens piece of wherein said sampling image lens can design the use glass lens, or modeling glass lens is used in design.

Advantage of the present utility model is that sampling image lens has high resolving power can effectively dwindle lens length again, makes sampling image lens have smaller size smaller and lower cost, and promotes the application of sampling image lens.

Description of drawings

Fig. 1 is the optical texture synoptic diagram of the utility model one embodiment;

Fig. 2 is the light path synoptic diagram of the utility model one embodiment;

Fig. 3 is the lateral light fan figure (transverse ray fan plot) of five different visual fields (actual image height 0,0.33,0.66,0.99,1.32mm) of the utility model one embodiment;

Fig. 4 is the curvature of field (field curvature) figure of the imaging of the utility model one embodiment;

Fig. 5 is distortion (distortion) figure of the imaging of the utility model one embodiment;

Modulation transfer function (the modulation transfer function) figure that Fig. 6 is produced when being corresponding 0 to the 120LP/mm spatial frequencys in five visual fields (actual image height 0,0.33,0.66,0.99,1.32mm) of the utility model one embodiment (spatial frequency);

Fig. 7 is relative exposure (relativeillumination) figure that corresponding zero visual field, full visual field embodiment illustrated in fig. 1 is produced;

Fig. 8 is the optical texture synoptic diagram of the utility model one embodiment;

Fig. 9 is the light path synoptic diagram of the utility model one embodiment;

Figure 10 is the lateral light fan figure of five different visual fields (actual image height 0,0.33,0.66,0.99,1.32mm) of the utility model one embodiment;

Figure 11 is the curvature of field figure of the imaging of the utility model one embodiment;

Figure 12 is the distortion figure of the imaging of the utility model one embodiment;

The modulation transfer function figure that Figure 13 is produced when being corresponding 0 to the 120LP/mm spatial frequency in five visual fields (actual image height 0,0.33,0.66,0.99,1.32mm) of the utility model one embodiment;

Figure 14 is the relative exposure figure that corresponding zero visual field, full visual field embodiment illustrated in fig. 1 is produced.

Description of reference numerals: L1-first lens piece; The 11-convex surface; The 12-concave surface; The 13-aperture diaphragm; L2-second lens piece; The 21-convex surface; The 22-concave surface; The 3-infrared filter; The 4-image sensor; The 41-sensing face.

Embodiment

For making the utility model clear and definite more full and accurate, enumerate preferred embodiment and cooperate following diagram, structure of the present utility model and technical characterictic thereof are described in detail as the back:

With reference to Fig. 1, shown in Figure 2, it is respectively structural representation and the light path synoptic diagram of the utility model one embodiment, the utility model two eyeglass formula optical shooting lens (two element type optical imaging lens), by the thing side in regular turn (in order from the object side) comprise: first lens piece of a positive diopter (a firstlens element of positive refractive power) L1, second lens piece of one positive diopter (a secondlens element of positive refractive power) L2, one infrared filter (IR cut-off filter) 3, with an image sensor (image sensing chip) 4, and arrange formation in regular turn as shown in Figure 1 with a common optical axis (optical axis) X; During capture, light is earlier through behind the first lens piece L1 and the second lens piece L2, is imaged on through an infrared filter 3 on the sensing face 41 of image sensor 4 as shown in Figure 2 again.

The described first lens piece L1 is a lunate plastic lens or a molded glass lens, and its convex surface 11 is at thing side (on the object side), and convex surface (convex lens surface) 11 has at least one side to be aspheric surface with concave surface 12; The second lens piece L2 is a lunate plastic lens, and its convex surface 21 is in picture side (onthe image side), and convex surface 21 has at least one side to be aspheric surface with concave surface 22; Sampling image lens of the present utility model can be established a preposition aperture as shown in Figure 1, 2 or a mid-aperture (figure do not show), its aperture diaphragm (aperturestop) 13 is located on the thing side convex surface 11 of the first lens piece L1 as shown in Figure 1, 2 or before the thing side convex surface 11, or is located on the picture side concave surface 12 of the first lens piece L1 or on the thing side concave surface 22 of the second lens piece L2 or between the thing side concave surface 22 of the picture side concave surface 12 of the first lens piece L1 and the second lens piece L2 (figure does not show); The first lens piece L1 of sampling image lens of the present utility model and the second lens piece L2 can design the use glass lens again, also can design the use modeling glass lens, to promote the application of sampling image lens.

The utility model two eyeglass formula optical shooting lens meet the following conditions again:

0.4f≤d＜0.9f；

0.5f≤|R3|≤100f；

5＜| f2|/| f1|＜15: with

20≤Vd≤60；

Wherein, f is the lens system effective focal length, d is the distance of the convex surface 11 (thing side) of the first lens piece L1 to the convex surface 21 (as the side) of the second lens piece L2, R3 is the radius-of-curvature of the second lens piece thing side, f1 is the effective focal length of first lens piece, f2 is the effective focal length of second lens piece, with Vd be the Abbe number (Abbe ' s number) of first lens piece and second lens piece.Rely on said structure, make the utility model sampling image lens have high resolving power and can effectively dwindle lens length, make sampling image lens have smaller size smaller and lower cost, and promote the application of sampling image lens.

Now enumerate preferred embodiment and be described as follows:

＜the first embodiment 〉

Show the optical surface number # (surface number) that numbers (in order from the object side) by the thing side in regular turn respectively in the following tabulation (), each optical surface kenel (Type), (the unit: mm) (the radius of curvature R) of the radius of curvature R of each optical surface on optical axis, on the optical axis between each face apart from D (unit: mm) (the on-axis surface spacing), with the refractive index n d and the Abbe number Vd of eyeglass material.

Table (one)

Surf# optical surface number	The Type kenel	The R radius-of-curvature	The D spacing	Nd, Vd refractive index, Abbe number
					Object (OBJ)	STANDARD	∞	∞
1 (STO) aperture diaphragm (convex surface 11 of L1)	The EVENASPH aspheric surface	0.6225816	0.48	1.545 56
					2 (concave surfaces 12 of L1)	The EVENASPH aspheric surface	0.9802095	0.33
3 (concave surfaces 22 of L2)	The EVENASPH aspheric surface	-3.224123	0.6	1.545 56
					4 (convex surfaces 21 of L2)	The EVENASPH aspheric surface	-2.551759	0.433
The thing side of 5 infrared filters 3	STANDARD	∞	0.3	1.5168 64.17
					The picture side of 6 infrared filters 3	STANDARD	∞	0.3167179
The sensing face of image sensor (IMG)	STANDARD	∞

Every aspheric surface that each optical surface is shown in following tabulation (two) is several:

Table (two)

Conic	Coeff on	Coeff on	Coeff on
				K	A	B	C
0
				-0.2847496	-0.29583399	15.225922	-137.12219
7.86497	0.32532839	-5.7793274	60.140459
				11.49785	-0.12509564	-0.23024176	35.418169
4.907259	0.016087259	-0.24941511	-0.48996415
				0
0
				0

Coeff on	Coeff on	Coeff on	Coeff on
				D	E	F	G
				877.98444	-2695.721	3115.9967	0
-246.99723	-1496.2938	-8967.0111	0
				-705.41872	4589.4081	-11374.327	0
3.2021391	-3.05679	7.005118	2.7576898

Z=ch2/{1+[1-(1+K) c2h2] 1/2}+Ah4+Bh6+Ch8+Dh10+EH12+Fh14+Gh16 is its aspheric surface equation (A spherical Surface Formula), wherein, c is a curvature, h is the eyeglass height, K is that circular cone is a number (Conic Constant), and A, B, C, D, E, F and G to be respectively the aspheric surface on quadravalence, six rank, eight rank, ten rank, ten second orders, ten quadravalences and 16 rank are several (Nth Order A sphericalCoefficient).And the material of first and second lens piece L1, the L2 of present embodiment all is plastics, can adopt refractive index and Abbe number to be respectively 1.545 and 56 plastic material and make; The material of infrared filter 3 is a glass, can adopt refractive index and Abbe number to be respectively 1.5168 and 64.17 glass material and make, and its thickness is 0.3mm.

The effective focal length f of lens system is 2.15mm again, and the convex surface 11 of the first lens piece L1 (thing side) to the convex surface 21 (as the side) of the second lens piece L2 be 1.41mm apart from d, can satisfy condition: 0.4f≤d＜0.9f; The radius-of-curvature of the concave surface 22 of the second lens piece L2 (thing side) again | R3|=3.224mm can satisfy condition: 0.5f≤| R3|≤100f; And the effective focal length f1 of the first lens piece L1 is 2.125mm, and the effective focal length f2 of the second lens piece L2 is 17.076mm, its | f2|/| f1|=8.036 can satisfy condition: 5＜| f2|/| f1|＜15; And the Abbe number of first lens piece and second lens piece (Abbe ' s number) Vd is 56, can satisfy condition: 20≤Vd≤60.

Please refer to Fig. 3 to shown in Figure 7, it is respectively five different visual fields (actual image height 0 of present embodiment, 0.33,0.66,0.99,1.32mm) lateral light fan figure (transverse ray fan plot), the curvature of field of imaging (field curvature) figure, the distortion of imaging (distortion) figure, five visual field (actual image heights 0,0.33,0.66,0.99,1.32mm) modulation transfer function (the modulation transfer funcrion) figure that produced during corresponding 0 to 120LP/mm spatial frequency (spatial frequency), relative exposure (relative illumination) figure that corresponding zero visual field with full visual field is produced; And rely on above-mentioned table (), table (two) and Fig. 3 to shown in Figure 7, the camera lens total length of the utility model sampling image lens (total length) is 2.45972mm as can be known, provable sampling image lens of the present utility model has high resolving power and can effectively dwindle lens length again, make to the utlity model has smaller size smaller and lower cost, and can promote application of the present utility model.

＜the second embodiment 〉

Show the optical surface number # (surface number) that numbers (in order from the object side) by the thing side in regular turn respectively in the following tabulation (), each optical surface kenel (Type), (the unit: mm) (the radius of curvature R) of the radius of curvature R of each optical surface on optical axis, on the optical axis between each face apart from D (unit: mm) (the on-axis surface spacing), with the refractive index n d and the Abbe number Vd of eyeglass material.

Table (one)

Surf# optical surface number	The Type kenel	The R radius-of-curvature	The D spacing	Nd, Vd refractive index, Abbe number
					Object (OBJ)	STANDARD	∞	∞
1 (STO) aperture diaphragm (convex surface 11 of L1)	The EVENASPH aspheric surface	0.6146943	0.4563392	1.545 56
					2 (concave surfaces 12 of L1)	The EVENASPH aspheric surface	1.089196	0.32
3 (concave surfaces 22 of L2)	The EVENASPH aspheric surface	-2.331669	0.8019809	1.585 31
					4 (convex surfaces 21 of L2)	The EVENASPH aspheric surface	-2.252521	0.32
The thing side of 5 infrared filters 3	STANDARD	∞	0.09	1.5168 64.17
					The picture side of 6 infrared filters 3	STANDARD	∞	0.4898221
The sensing face of image sensor (IMG)	STANDARD	∞

Every aspheric surface that each optical surface is shown in following tabulation (two) is several:

Table (two)

Conic K	Coeffon A	Coeffon B	Coeffon C
				0
-0.2847496	-0.29583399	15.225922	-137.12219
				7.86497	0.32532839	-5.7793274	60.140459
11.49785	-0.12509564	-0.23024176	35.418169
				4.907259 0 0 0	0.016087259	-0.24941511	-0.48996415

Coeffon	Coeffon	Coeffon	Coeffon
				D	E	F	G
				877.98444	-2695.721	3115.9967	0
-246.99723	-1496.2938	-8967.0111	0
				-705.41872	4589.4081	-11374.327	0
3.2021391	-3.05679	7.005118	2.7576898

Z=ch2/{1+[1-(1+K) c2h2] 1/2}+Ah4+Bh6+Ch8+Dh10+EH12+Fh14+Gh16 is its aspheric surface equation (A spherical Surface Formula), wherein, c is a curvature, h is the eyeglass height, K is that circular cone is a number (Conic Constant), and A, B, C, D, E, F and G to be respectively the aspheric surface on quadravalence, six rank, eight rank, ten rank, ten second orders, ten quadravalences and 16 rank are several (Nth Order A sphericalCoefficient).And the material of first and second lens piece L1, the L2 of present embodiment all is plastics, and L1 can adopt refractive index and Abbe number to be respectively 1.545 and 56 plastic material and make, and L2 can adopt refractive index and Abbe number to be respectively 1.585 and 31 plastic material and make; The material of infrared filter 3 is a glass, can adopt refractive index and Abbe number to be respectively 1.5168 and 64.17 glass material and make, and its thickness is 0.09mm.

The effective focal length f of lens system is 2.113mm again, and the convex surface 11 of the first lens piece L1 (thing side) to the convex surface 21 (as the side) of the second lens piece L2 be 1.578mm apart from d, can satisfy condition: 0.4f≤d＜0.9f; The radius-of-curvature of the concave surface 22 of the second lens piece L2 (thing side) again | R3|=2.332mm can satisfy condition: 0.5f≤| R3|≤100f; And the effective focal length f1 of the first lens piece L1 is 1.933mm, and the effective focal length f2 of the second lens piece L2 is 23.932mm, its | f2|/| f1|=12.381 can satisfy condition: 5＜| f2|/| f1|＜15; And the Abbe number of first lens piece and second lens piece (Abbe ' s number) Vd is respectively 56,31, can satisfy condition: 20≤Vd≤60.

Please refer to Fig. 3 to shown in Figure 7, it is respectively five different visual fields (actual image height 0 of present embodiment, 0.33,0.66,0.99,1.32mm) lateral light fan figure (transverse ray fan plot), the curvature of field of imaging (field curvature) figure, the distortion of imaging (distortion) figure, five visual field (actual image heights 0,0.33,0.66,0.99,1.32mm) modulation transfer function (the modulation transfer function) figure that produced during corresponding 0 to 120LP/mm spatial frequency (spatial frequency), relative exposure (relative illumination) figure that corresponding zero visual field with full visual field is produced; And rely on above-mentioned table (), table (two) and Fig. 3 to shown in Figure 7, the camera lens total length of the utility model sampling image lens (total length) is 2.47814mm as can be known, provable sampling image lens of the present utility model has high resolving power and can effectively dwindle lens length again, make to the utlity model has smaller size smaller and lower cost, and can promote application of the present utility model.

More than shown in only be this novel preferred embodiment, novel for this only is illustrative, and nonrestrictive.Those skilled in the art is understood, and can carry out many changes to it in these spirit and scope that novel claim limited, revise, even the equivalence change, but all will fall in this novel protection domain.

Claims (10)

1. eyeglass formula optical shooting lens, it is characterized in that: it is arranged in regular turn along same optical axis and by the thing side:

First lens piece of one positive diopter, it is a meniscus non-spherical lens, and its convex surface is in the thing side;

Second lens piece of one positive diopter, it is a meniscus non-spherical lens, and its convex surface is in the picture side;

One infrared filter; With

One image sensor;

Wherein, meet the following conditions:

0.4f≤d＜0.9f；

0.5f≤|R3|≤100f；

5＜| f2|/| f1|＜15; With

20≤Vd≤60；

Wherein, f is the camera lens effective focal length, d is that the thing side of first lens piece is to the distance of second lens piece as the side, R3 is the radius-of-curvature of the second lens piece thing side, f1 is the effective focal length of first lens piece, f2 is the effective focal length of second lens piece, and Vd is the Abbe number of first lens piece and second lens piece.

2. two eyeglass formula optical shooting lens according to claim 1 is characterized in that: the convex surface of first lens piece of described positive diopter and concave surface have at least one side to be aspheric surface.

3. two eyeglass formula optical shooting lens according to claim 1 is characterized in that: the convex surface of second lens piece of described positive diopter and concave surface have at least one side to be aspheric surface.

4. two eyeglass formula optical shooting lens according to claim 1 is characterized in that: also comprise a preposition aperture.

5. two eyeglass formula optical shooting lens according to claim 4 is characterized in that: the aperture diaphragm of putting aperture before described is to be positioned on the thing side convex surface of described first lens piece or before.

6. two eyeglass formula optical shooting lens according to claim 1 is characterized in that: also comprise a mid-aperture.

7. two eyeglass formula optical shooting lens according to claim 6 is characterized in that: the aperture diaphragm of described aperture be on the picture side of described first lens piece or on the thing side of second lens piece or first lens piece as the side and the second lens piece thing side between.

8. two eyeglass formula optical shooting lens according to claim 1, it is characterized in that: described first lens piece is glass lens or modeling glass lens.

9. two eyeglass formula optical shooting lens according to claim 1, it is characterized in that: described second lens piece is glass lens or modeling glass lens.

10. two eyeglass formula optical shooting lens according to claim 1, it is characterized in that: described infrared filter is a glass mirror.

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