CN101393317B - Double-piece photographic lens - Google Patents

Abstract

The invention discloses a two-chip photographic lens, which can provide high optical performance by utilization of selection of adequate lens materials and exertion of optimal refracting power and adequate chromatism compensation. The two-chip photographic lens is provided with an aperture, a first lens an a second lens which are arranged in turn from the object side, wherein the first lens is a positive half falcate lens the convex surface of which faces to the object side; the second lens is a negative half falcate lens the convex surface of which faces to the image side; and the two-chip photographic lens is a plastic lens both surfaces of which are aspheric surfaces, and meets the following conditional expressions: f1/f is more than 0.55 and less than 0.95, f2/f is more than -2.0 and less than -1.0, and v1-v2 is more than 27.0, wherein f refers to the focal distance of an optical system, f1 refers to the focal distance of the first lens, f2 refers to the focal distance of the second lens, v1 refers to the dispersion ratio of the first lens, and v2 refers to the dispersion ratio of the second lens. The two-chip photographic lens can be applied in the field of a portable small machine with high optical performance.

Description

Double-piece photographic lens

Technical field

The present invention relates to a kind of eyeglass, be specifically related to a kind of double-piece photographic lens.

Background technology

At present employed a kind of photographic lens is made of two eyeglasses, from the thing side, is arranged in order and is aperture, first eyeglass (Lens) and second eyeglass (Lens).

Along with the exploitation of mobile phone to low price, all the time, corresponding high image quality (1,000,000～3,000,000 picture element) technology all adopts the optical design of three formations, though the person of designing and developing also is required to reach the optical design of two formations, but will be with two optical designs of reaching high picture element, have a big problem, that is exactly the characteristic meeting variation of incident angle.

, be used in the progressing greatly during exploitation of small eyeglass on CCD or the CMOS solid-state image pickup sub-prime, slightly the also specification of quality of tolerable on CCD or CMOS solid-state image pickup sub-prime of the characteristic of the incident angle of variation;

And also in the middle of progressing greatly, the optical property of using usual plastic material to reach along with the use of new material, can realize required optical property in the exploitation of glass lens material in recent years.

Small-sized and possess high performance two contents that constitute the patent documentation following 1～4 of photographic lens:

Patent documentation 1 spy opens the 2004-170460 communique;

Patent documentation 2 spies open the 2005-121685 communique;

Patent documentation 3 spies open the 2006-154517 communique;

Patent documentation 4 spies open the 2006-178026 communique;

The aperture of these some patented products all is configured in the thing side, causes that to penetrate out the Rising-moon position far away apart from image planes, guarantees good incident angle also.

Remaining problem is:

What first eyeglass of patent documentation 1 used is the glass mirror of high unit price, the refracting power that also has its second eyeglass a little less than, can't definitely reach look and receive the difference revisal.

First and second eyeglass of patent documentation 2,4 is to use same material, look receive difference can't revisal to very sufficient, therefore can't guarantee that high optical property is arranged.

Second eyeglass of patent documentation 3 is convex surface negative eyeglasses towards the thing side, therefore, is exactly the concave surface that is not easy to make as side, and the periphery of eyeglass is swung to the shape of picture side, so burnt guaranteeing after the mechanism, is not easy to reach.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of double-piece photographic lens, by selecting appropriate lens materials, gives only refracting power, receives the also appropriate revisal of difference, thereby a kind of photographic lens of high optical property is provided.

For solving the problems of the technologies described above, the technical solution of double-piece photographic lens of the present invention is:

Photographic lens of the present invention is from the thing side, is arranged in order two formation photographic lens into aperture, first eyeglass (Lens) and second eyeglass (Lens);

This first eyeglass (Lens) is the positive half-crescent shape eyeglass of convex surface towards the thing side;

This second eyeglass (Lens) is the negative half-crescent shape eyeglass of convex surface towards the picture side;

And first eyeglass (Lens) and second eyeglass (Lens) are the glass lens of both-sided aspherical, and the conditional that satisfies following (1)～(3) is the feature of this photographic lens:

0.55＜f1/f＜0.95 ……………………………………(1)

-2.0＜f2/f＜-1.0 ……………………………………(2)

27.0＜v1-v2 ……………………………………(3)

Aforementioned f is that focal length, the f1 of whole optical system is that focal length, the f2 of first eyeglass is that focal length, the v1 of second eyeglass is that dispersion rate, the v2 of first eyeglass is the dispersion rate of second eyeglass.

This photographic lens is two formations, and first eyeglass (Lens) is the positive half-crescent shape eyeglass of convex surface towards the thing side.Second eyeglass (Lens) is the negative half-crescent shape eyeglass of convex surface towards the picture side.And first eyeglass (Lens) and second eyeglass (Lens) are the glass lens of both-sided aspherical.At this, when following, it is excessive that the refracting power of first eyeglass just becomes as the lower limit that reaches conditional (1) for f1/f, and back Jiao just shortens.Also have, non-ly check and accept difference and coma (comatic aberration) can become bad.When above, the positive refracting power of first eyeglass just dies down f1/f as the higher limit that reaches conditional (1), and optical full length is elongated.

F2/f is as when the lower limit of conditional (2) is following, and the change of the refracting power of this second eyeglass is too little, the multiplying power look is received the revisal difficulty of difference, and then made peripheral mis-behave.F2/f is as when the higher limit of conditional (2) is above, and it is excessive that the refracting power of this second eyeglass becomes; Therefore, receive the balance of difference in order to obtain look, the positive refracting power of this first eyeglass grow of also having to, also the foozle with core shift also becomes big.

V1-v2 is when the lower limit of conditional (3) is following in this way, and this look is received the revisal of difference with insufficient, solid-state image pickup sub-prime (CCD or CMOS) that can't corresponding high picture element;

So,, can know the technology practice of the present invention, not only receive the also appropriate revisal of difference, more can provide high performance photographic lens from each embodiment described later for satisfying above-mentioned conditional (1) (2) (3).

In addition, following conditional (4) is satisfied in the present invention's expectation, and performance will be better:

0.85＜TL/f＜1.15 ……………………………………(4)

Aforementioned TL is the distance (parallel plane glass part then be converted into distance between mirrors) of the object side of first eyeglass to image planes, also has, and aforementioned parallel plane glass is meant optics Low pass filter and coverglass etc.

TL/f is when the lower limit of conditional (4) is following in this way, and its optical system diminishes, and becomes lens shape and the thickness of making difficulty; Also have, what the characteristic of its incident angle also became can't allow.

The TL/f when higher limit of conditional (4) is above in this way, optical system become big, reach miniaturization and have any problem.

What deserves to be mentioned is that the present invention is if can meet the following conditions formula (5) also can be better:

0.18＜d2/f＜0.32 ……………………………………(5)

Aforementioned d2 is the interval of first eyeglass and second eyeglass.

D2/f is when the lower limit of conditional (5) is following in this way, that the interval of its first eyeglass that positive refracting power arranged and second eyeglass that negative refracting power is arranged becomes is too narrow, the balance change of the outer performance of axle bad; Its results of property and each are received poor becoming can't obtain good revisal.

D2/f is when the higher limit of conditional (5) is above in this way, and the interval of its first eyeglass and second eyeglass becomes too wide and then makes the external diameter of second eyeglass become big, can't reach miniaturization; Can allow contrast differences apart from expansion in addition.

The present invention is if the formula (6) that can meet the following conditions can produce better performance again:

-3.65＜(r1+r2)/(r1-r2)＜-1.50 …………………(6)

Aforesaid r1 is the thing side radius-of-curvature of first eyeglass, the picture side radius-of-curvature that r2 is first eyeglass.

(r1+r2)/(r1-r2) in this way conditional (6) though lower limit when following, back burntly can guarantee that but sphere receives difference and become big.

When (r1+r2)/(r1-r2) higher limit of conditional (6) is above in this way, the back Jiao shorten.

Note conditional (7) also has better performance if can satisfy down in the present invention:

-1.3＜r3/f＜-0.5 ……………………………………(7)

Aforementioned r3 is the thing side radius-of-curvature of second eyeglass;

R3/f is when the lower limit of conditional (7) is following in this way, and the sag of chain of its second lens perimeter changes and becomes greatly, the difficulty of the one-tenth deformation of eyeglass.

R3/f is when the higher limit of conditional (7) is above in this way, and the negative refracting power grow of its second eyeglass, the total length of eyeglass are elongated.

Description of drawings

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:

Figure 1A is that the eyeglass of embodiment 1 constitutes synoptic diagram;

Figure 1B is that the sphere of embodiment 1 is received poor, non-poor, the askew differential intention that gets of checking and accepting;

Fig. 2 A is that the eyeglass of embodiment 2 constitutes synoptic diagram;

Fig. 2 B is that the sphere of embodiment 2 is received poor, non-poor, the askew differential intention that gets of checking and accepting;

Fig. 3 A is that the eyeglass of embodiment 3 constitutes synoptic diagram;

Fig. 3 B is that the sphere of embodiment 3 is received poor, non-poor, the askew differential intention that gets of checking and accepting;

Fig. 4 A is that the eyeglass of embodiment 4 constitutes synoptic diagram;

Fig. 4 B is that the sphere of embodiment 4 is received poor, non-poor, the askew differential intention that gets of checking and accepting;

Fig. 5 A is that the eyeglass of embodiment 5 constitutes synoptic diagram;

Fig. 5 B is that the sphere of embodiment 5 is received poor, non-poor, the askew differential intention that gets of checking and accepting;

Fig. 6 A is that the eyeglass of embodiment 6 constitutes synoptic diagram;

Fig. 6 B is that the sphere of embodiment 6 is received poor, non-poor, the askew differential intention that gets of checking and accepting;

Fig. 7 A is that the eyeglass of embodiment 7 constitutes synoptic diagram;

Fig. 7 B is that the sphere of embodiment 7 is received poor, non-poor, the askew differential intention that gets of checking and accepting;

Fig. 8 A is that the eyeglass of embodiment 8 constitutes synoptic diagram;

Fig. 8 B is that the sphere of embodiment 8 is received poor, non-poor, the askew differential intention that gets of checking and accepting;

Fig. 9 A is that the eyeglass of embodiment 9 constitutes synoptic diagram;

Fig. 9 B is that the sphere of embodiment 9 is received poor, non-poor, the askew differential intention that gets of checking and accepting.

Among the figure, 1 aperture, 2 first eyeglasses, 3 second eyeglasses, 4 parallel plane glass, 5 shooting faces.

Embodiment

Below will double-piece photographic lens of the present invention be described with suitable embodiment and accompanying drawing, wherein Fig. 1～shown in Figure 9 be embodiment 1 to embodiment 9 eyeglass pie graph (Figure 1A～Fig. 9 A) with receive difference figure (Figure 1B～Fig. 9 B); Show the data of each embodiment with table 1A～table 9A and table 1B～table 9B in addition; Receive shown in the difference figure is that each sphere is received poor (mm of unit), non-poor (mm of unit), the distortion receipts poor (% of unit) of checking and accepting.Be photographic lens of the present invention, the built-in optical system of the portable machines such as portable phone of solid-state image pickup sub-prime is arranged, possess especially suitable formation is arranged.

＜about the pie graph of eyeglass 〉

Figure 1A～Fig. 9 A is the optical arrangement of each embodiment of expression, photographic lens among each embodiment is along optical axis, begin to be arranged in order by aperture 1, first eyeglass (Lens) 2, second eyeglass (Lens) 3, parallel plane glass 4 and shooting face 5 are disposed by the thing side and form, this parallel plane glass 4 is the usefulness of excision infrared ray, and itself and shooting face 5 be protection solid-state image pickup sub-primes (CCD and CMOS) jointly;

Aforementioned first eyeglass (Lens) the 2nd, convex surface be towards the positive half-crescent shape eyeglass of thing side, second eyeglass (Lens) the 3rd, and convex surface is towards the negative half-crescent shape eyeglass of picture side, and first eyeglass (Lens) 2 and second eyeglass (Lens) the 3rd, the glass lens of both-sided aspherical;

Each receives non-checking and accepting shown in the difference in the curve shown in difference figure, and S is that the receipts of expression sagittal image planes are poor, and T is that the receipts of expression meridional image planes are poor; Also have, aforementioned receipts difference figure also relevant for the data of d line, receives difference figure from these and can understand, and the present invention's revisal arrives the practical level of not having anxiety.

＜about the set of data of embodiment 1 eyeglass 〉

At first, illustrate about embodiment 1:

The focal length f=4.00mm of full optical system;

Fno.＝3.21；

Picture angle 2 ω=59.1 °;

Then, see also table 1A, begin successively the surface number of first eyeglass (Lens) 2, second eyeglass (Lens) 3 and parallel plane glass 4 is surface 1～surface 6 from the thing side, other be expressed as radius-of-curvature r (being paraxial radius-of-curvature mm), face d (mm) and flexion rate nd, dispersion rate vd at interval.Aforementioned the 1st, the 2nd ... the 6th face is to survey beginning numbering successively from thing, and for example: the 5th is parallel plane glass with the 6th face, is which all is r=∞, and for this point, other embodiment is identical.

Also have, shown in the table 1B is the aspheric surface coefficient, be that any embodiment also is that whole eyeglass faces all is that aspheric surface forms, the asphericity coefficient of aspherical shape is A, B, C, D, E, the height of optical axis is that H, optical axis direction displacement are X, and when being benchmark with each vertex of surface, following conditional is set up:

X＝(1/R)H ²/[1+{1-(1+K)(H/R) ²} ^1/2]+AH ⁴+BH ⁶+CH ⁸+DH ¹⁰+EH ¹²；

R is that paraxial radius-of-curvature, K are that the souvenir of E-03 of circular cone coefficient, asphericity coefficient etc. is 10 ^-3The meaning; All identical for this point with other embodiment data representation.

	r	d	nd	vd
						∞	0.000
1	1.2095	0.503	1.54340	56.5
					2	4.3175	1.013
3	-3.2164	1.424	1.63200	23.4
					4	-23.7226	0.460

	r	d	nd	vd
						5	∞	0.300	1.51680	64.2
6	∞	0.489

Table 1A

The 1st		The 2nd		The 3rd		The 4th
								K＝	5.13693E-01	K＝	-2.01029E+01	K＝	9.89833E-01	K＝	-3.37706E+01
A＝	-3.38891E-02	A＝	1.66529E-02	A＝	-1.83805E-01	A＝	-4.13464E-02
								B＝	-2.46407E-01	B＝	3.78489E-01	B＝	-2.92570E-01	B＝	-8.59505E-03
C＝	1.94521E+00	C＝	-3.49597E+00	C＝	-8.51336E-01	C＝	6.22959E-03
								D＝	-9.79369E+00	D＝	1.05518E+01	D＝	1.13853E+01	D＝	-6.77233E-03
E＝	2.47586E+01	E＝	2.10595E+00	E＝	-4.69092E+01	E＝	4.13201E-03

Table 1B

＜embodiment 2 〉

About being described as follows of embodiment 2:

Full optical system focal length f=4.62mm;

Fno.＝2.92；

Picture angle 2 ω=56.0 °;

	r	d	nd	vd
						∞	0.000
1	1.3562	0.564	1.54340	56.5
					2	5.0355	1.239
3	-2.7596	1.828	1.63200	23.4
					4	-9.8418	0.449
5	∞	0.300	1.51680	64.2
					6	∞	0.488

Table 2A

Table 2A is that the set of data, the table 2B of eyeglass is the expression asphericity coefficient.

The 1st		The 2nd		The 3rd		The 4th
								K＝	1.29242E-01	K＝	3.15006E-01	K＝	-3.21073E-01	K＝	-7.86269E+00
A＝	-9.08382E-04	A＝	2.70775E-02	A＝	-1.91369E-01	A＝	-2.08962E-02
								B＝	-9.27818E-02	B＝	-3.35055E-02	B＝	3.72625E-01	B＝	-9.83922E-03
C＝	6.37964E-01	C＝	-1.38815E-01	C＝	-2.20644E+00	C＝	6.10556E-03
								D＝	-2.50149E+00	D＝	4.33982E-01	D＝	6.22376E+00	D＝	-4.02529E-03
E＝	5.15472E+00	E＝	3.42007E-01	E＝	-1.17844E+01	E＝	1.51404E-03

Table 2B

＜embodiment 3 〉

Explanation about embodiment 3:

The focal length f=3.14mm of full optical system;

Fno.＝3.22；

Picture angle 2 ω=58.1 °;

Table 3A is that the set of data, the table 3B of eyeglass is the expression asphericity coefficient.

	r	d	nd	vd
						∞	0.000
1	0.8061	0.495	1.54340	56.5
					2	1.5423	0.787
3	-3.7096	0.774	1.63200	23.4
					4	-352.5598	0.253
5	∞	0.500	1.51680	64.2
					6	∞	0.400

Table 3A

The 1st		The 2nd		The 3rd		The 4th
								K＝	5.61761E-01	K＝	2.97022E-01	K＝	-1.88710E+01	K＝	1.00000E+00
A＝	-4.39698E-02	A＝	3.24764E-01	A＝	-4.33358E-01	A＝	-1.35113E-01
								B＝	-9.60236E-01	B＝	5.16416E-01	B＝	2.18731E-01	B＝	-1.66172E-01
C＝	9.73796E+00	C＝	2.85387E+00	C＝	-1.59626E+01	C＝	3.39366E-01
								D＝	-7.15122E+01	D＝	-1.75796E+01	D＝	1.40289E+02	D＝	-3.16976E-01
E＝	2.96511E+02	E＝	2.60540E+02	E＝	-5.88477E+02	E＝	4.94315E-02

Table 3B

＜embodiment 4 〉

Explanation about embodiment 4:

The focal length f=4.00mm of full optical system;

Fno.＝3.21；

Picture angle 2 ω=58.9 °;

Table 4A is that the set of data, the table 4B of eyeglass is the expression asphericity coefficient.

	r	d	nd	vd
						∞	0.000
1	1.1480	0.508	1.51357	56.8
					2	4.4250	1.018
3	-2.6737	1.424	1.63200	23.4
					4	-9.9728	0.460
5	∞	0.300	1.51680	64.2
					6	∞	0.489

Table 4A

The 1st		The 2nd		The 3rd		The 4th
								K＝	4.90158E-01	K＝	-1.40193E+01	K＝	-5.75445E+00	K＝	-3.37687E+01
A＝	-3.92128E-02	A＝	1.87887E-02	A＝	-2.32245E-01	A＝	-4.16298E-02
								B＝	-2.27515E-01	B＝	4.77155E-01	B＝	-3.56468E-01	B＝	-6.77383E-03
C＝	1.87992E+00	C＝	-4.04707E+00	C＝	-2.28723E-01	C＝	1.57537E-03
								D＝	-9.71245E+00	D＝	1.18076E+01	D＝	9.48334E+00	D＝	-6.72410E-03
E＝	2.46752E+01	E＝	3.00780E+00	E＝	-4.91502E+01	E＝	6.09171E-03

Table 4B

＜embodiment 5 〉

Explanation about embodiment 5:

The focal length f=3.80mm of full optical system;

Fno.＝3.05；

Picture angle 2 ω=61.6 °;

Table 5A is that the set of data, the table 5B of eyeglass is the expression asphericity coefficient.

	r	d	nd	vd
						∞	0.000
1	1.2110	0.500	1.54340	56.5
					2	4.5326	0.976
3	-3.5189	1.265	1.60730	26.6
					4	-31.3702	0.460
5	∞	0.300	1.51680	64.2
					6	∞	0.492

Table 5A

The 1st		The 2nd		The 3rd		The 4th
								K＝	3.58145E-01	K＝	-4.44131E+01	K＝	8.71123E-01	K＝	8.52248E-01
A＝	-2.54403E-02	A＝	1.13437E-02	A＝	-1.60232E-01	A＝	-4.81666E-02
								B＝	-2.89336E-01	B＝	6.59310E-01	B＝	-8.58893E-01	B＝	-1.12689E-02
C＝	2.20118E+00	C＝	-5.61432E+00	C＝	1.79418E+00	C＝	8.69445E-03
								D＝	-1.01746E+01	D＝	1.60916E+01	D＝	7.37499E+00	D＝	-1.53795E-02
E＝	2.37981E+01	E＝	-1.16886E+00	E＝	-5.73676E+01	E＝	1.22324E-02

Table 5B

＜embodiment 6 〉

Explanation about embodiment 6:

The focal length f=3.19mm of full optical system;

Fno.＝2.94；

Picture angle 2 ω=57.1 °;

	r	d	nd	vd
						∞	0.000
1	0.7894	0.524	1.54340	56.5
					2	1.4736	0.750
3	-2.8978	0.799	1.63200	23.4
					4	-24.3264	0.385
5	∞	0.300	1.51680	64.2
					6	∞	0.391

Table 6A

The 1st		The 2nd		The 3rd		The 4th
								K＝	7.10189E-03	K＝	-7.26930E-01	K＝	-1.62371E+01	K＝	-2.37479E+01
A＝	6.29796E-02	A＝	1.31317E-01	A＝	-8.05037E-01	A＝	-2.36455E-01
								B＝	-6.51339E-01	B＝	6.47390E+00	B＝	2.69337E+00	B＝	1.79767E-01
C＝	1.14712E+01	C＝	-5.47926E+01	C＝	-2.51006E+01	C＝	-1.94376E-01
								D＝	-8.01281E+01	D＝	2.46547E+02	D＝	1.48383E+02	D＝	8.29011E-03
E＝	3.01764E+02	E＝	-2.37800E+02	E＝	-5.82044E+02	E＝	8.63535E-02

Table 6B

Table 6A is that the set of data, the table 6B of eyeglass is the expression asphericity coefficient.

＜embodiment 7 〉

Explanation about embodiment 7:

The focal length f=4.60mm of full optical system;

Fmo.＝2.92；

Picture angle 2 ω=56.5 °;

Table 7A is that the set of data, the table 7B of eyeglass is the expression asphericity coefficient.

	r	d	nd	vd
						∞	0.000
1	1.3425	0.571	1.54340	56.5
					2	5.2669	1.080
3	-3.0317	1.980	1.63200	23.4
					4	-26.6517	0.449
5	∞	0.300	1.51680	64.2
					6	∞	0.488

Table 7A

The 1st		The 2nd		The 3rd		The 4th
								K＝	1.10618E-01	K＝	-2.36552E+01	K＝	-2.28303E+00	K＝	1.00000E+00
A＝	-8.17337E-04	A＝	2.47246E-02	A＝	-1.81589E-01	A＝	-1.46972E-02
								B＝	-1.16572E-01	B＝	8.59359E-03	B＝	1.44908E-01	B＝	-1.60219E-02
C＝	6.78642E-01	G＝	-3.33697E-01	C＝	-1.36826E+00	C＝	1.24196E-02
								D＝	-2.51847E+00	D＝	7.72366E-01	D＝	4.48092E+00	D＝	-6.75955E-03
E＝	5.08028E+00	E＝	-1.01624E-01	E＝	-9.68300E+00	E＝	2.22118E-03

Table 7B

＜embodiment 8 〉

Explanation about embodiment 8:

The focal length f=3.13mm of full optical system;

Fno.＝3.21；

Picture angle 2 ω=57.8 °;

Table 8A is that the set of data, the table 8B of eyeglass is the expression asphericity coefficient.

	r	d	nd	vd
						∞	0.000
1	0.7348	0.505	1.49420	71.6
					2	1.5635	0.724
3	-2.2706	0.828	1.63200	23.4
					4	-10.0795	0.253
5	∞	0.500	1.51680	64.2
					6	∞	0.397

Table 8A

The 1st		The 2nd		The 3rd		The 4th
								K＝	1.13364E-01	K＝	-2.80266E+00	K＝	-4.01612E+01	K＝	-1.36994E+01
A＝	-6.37307E-03	A＝	3.03256E-01	A＝	-1.15091E+00	A＝	-2.09078E-01
								B＝	-3.15177E-01	B＝	5.93720E+00	B＝	3.65521E+00	B＝	1.63913E-01
C＝	1.01027E+01	C＝	-4.95726E+01	C＝	-2.39585E+01	C＝	-1.78355E-01
								D＝	-8.51753E+01	D＝	1.38543E+02	D＝	1.26209E+02	D＝	-1.16812E-02
E＝	3.31819E+02	E＝	9.12385E+02	E＝	-5.70006E+02	E＝	5.95663E-02

Table 8B

＜embodiment 9 〉

Explanation about embodiment 9:

The focal length f=3.08mm of full optical system;

Fno.＝2.95；

Picture angle 2 ω=61.5 °;

Table 9A is that the set of data, the table 9B of eyeglass is the expression asphericity coefficient.

	r	d	nd	vd
						∞	0.000
1	0.7695	0.536	1.49420	71.6
					2	1.7391	0.714
3	-2.5825	0.810	1.71000	35.0
					4	-7.9486	0.250
5	∞	0.500	1.51680	64.2
					6	∞	0.391

Table 9A

The 1st		The 2nd		The 3rd		The 4th
								K＝	-2.38111E-02	K＝	-9.51996E-01	K＝	-8.61175E-01	K＝	1.00000E+00
A＝	7.54939E-02	A＝	3.88981E-01	A＝	-1.69855E-01	A＝	-2.98493E-02
								B＝	-9.20573E-01	B＝	-6.55625E-01	B＝	-2.43226E+00	B＝	-4.71325E-01
C＝	1.32884E+01	C＝	2.81058E+01	C＝	-8.80176E-01	C＝	9.95531E-01
								D＝	-8.64652E+01	D＝	-2.81394E+02	D＝	1.11711E+02	D＝	-1.12620E+00
E＝	3.15706E+02	E＝	1.69623E+03	E＝	-6.99084E+02	E＝	5.68837E-01

Table 9B

Aforementioned photographic lens of the present invention be first eyeglass 2 and second eyeglass 3 two constitute; Aforementioned f is that focal length, the f1 of full optical system is that focal length, the f2 of first eyeglass 2 is that focal length, the v1 of second eyeglass 3 is dispersion rate, v2 of first eyeglass 2 when being dispersion rates of second eyeglass 3, will satisfies following conditional:

0.55＜f1/f＜0.95 …………………………………(1)

-2.0＜f2/f＜-1.0 ………………………………(2)

27.0＜v1-v2 …………………………………………(3)

F1/f is when the lower limit of conditional (1) is following in this way, and it is excessive that the refracting power of second eyeglass 3 just becomes, and back Jiao just shortens.Also have, non-ly check and accept difference and coma (comatic aberration) becomes bad.

F1/f is when the higher limit of conditional (1) is above in this way, and the positive refracting power of first eyeglass 2 just dies down, and optical full length is elongated.

F2/f is as when the lower limit of conditional (2) is following, and the change of the refracting power of second eyeglass 3 is too little, the multiplying power look is received the revisal difficulty of difference, and then made peripheral mis-behave.

F2/f is as when the higher limit of conditional (2) is above, and it is excessive that the negative refracting power of second eyeglass 3 becomes; Therefore, receive the balance of difference for obtaining look, the positive refracting power of first eyeglass 2 also have to grow, also become big with the foozle of core shift.

V1-v2 is when the lower limit of conditional (3) is following in this way, and its look is received the revisal of difference with insufficient, solid-state image pickup sub-prime (CCD or CMOS) that can't corresponding high picture element.

When TL is the object side of first eyeglass to the distance (the parallel plane glass part is converted into distance between mirrors) of image planes, need to satisfy following conditional:

0.85＜TL/f＜1.15 ………………………………………(4)

TL/f in this way below the lower limit of conditional (4) constantly, optical system diminishes, and becomes shape and the thickness of making difficulty; What in addition, the incident angle characteristic became can't allow.

The TL/f when higher limit of conditional (4) is above in this way, optical system become big, will reach the miniaturization difficulty.

Among the present invention, when d2 is the interval of first eyeglass and second eyeglass, will satisfy following formula:

0.18＜d2/f＜0.32 …………………………………(5)

D2/f is when the lower limit of conditional (5) is following in this way, first eyeglass 2 that positive refracting power arranged with have the interval of second eyeglass 3 of negative refracting power to narrow down; And it is bad that the balance of the outer performance of axle becomes, and consequently all receipts differences can't obtain good revisal.

D2/f is when the higher limit of conditional (5) is above in this way, and the interval of first eyeglass 2 and second eyeglass 3 becomes too wide and then makes the external diameter of second eyeglass 3 become big, can't reach miniaturization; Also have, contrast differences is apart from expansion.

Among the present invention, when r1 is the thing side radius-of-curvature of first eyeglass, picture side radius-of-curvature that r2 is first eyeglass, satisfy following formula:

-3.65＜(r1+r2)/(r1-r2)＜-1.50 ………………(6)

When (r1+r2)/(r1-r2) lower limit of conditional (6) is following in this way, though but the back is burnt can guarantee that sphere receipts difference becomes big.

When (r1+r2)/(r1-r2) higher limit of conditional (6) was above in this way, back Jiao shortened.

Among the present invention, when r3 is the thing side radius-of-curvature of second eyeglass 3, will satisfy following conditional:

-1.3＜r3/f＜-0.5 ……………………………………(7)

R3/f is when the lower limit of conditional (7) is following in this way, and the sag of chain of second eyeglass, 3 peripheries changes and becomes greatly, the difficulty of the one-tenth deformation of eyeglass.

R3/f is when the higher limit of conditional (7) is above in this way, and the negative refracting power grow of second eyeglass 3, the total length of eyeglass are elongated.

The parameter of above terms and conditions formula is table 10 shown in table 10, table 11,11 α represents to make a video recording the maximum incident angle of sub-prime.

	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Embodiment 5
						f 1/f	0.73	0.70	0.80	0.72	0.76
f 2/f	-1.51	-1.46	-1.89	-1.56	-1.75
						v 1-v 2	33.09	33.09	33.09	33.41	29.85
TL/f	1.02	1.03	0.97	1.03	1.02
						d 2/f	0.25	0.27	0.25	0.25	0.26
(r 1+r 2)/(r 1-r 2)	-1.78	-1.74	-3.19	-1.70	-1.73
						r 3/f	-0.80	-0.60	-1.18	-0.67	-0.93
α	26.1°	22.9°	27.9°	25.3°	27.3°

Table 10

	Embodiment 6	Embodiment 7	Embodiment 8	Embodiment 9
					f 1/f	0.77	0.68	0.74	0.77
f 2/f	-1.65	-1.21	-1.54	-1.86
					v 1-v 2	33.09	33.09	48.20	36.60
TL/f	0.95	1.03	0.97	0.98
					d 2/f	0.23	0.23	0.23	0.23
(r 1+r 2)/(r 1-r 2)	-3.31	-1.68	-2.77	-2.59
					r 3/f	-0.91	-0.66	-0.72	-0.84
α	27.8°	25.2°	27.7°	28.0°

Table 11

What deserves to be mentioned is that photographic lens of the present invention is the glass lens that is shaped, other concrete example is exactly that can to use second eyeglass 3 of flexion rate nd=1.632 be that Fluorene is a polyester; Second eyeglass 3 of flexion rate nd=1.71, the default Lumiplus that can use Gas KCC of Mitsubishi to make; But the present invention does not limit and uses plastic material.

As above, the present invention is the photographic lens of two formations, after the selecting for use of appropriate glass lens material, gives the most appropriate refracting power, appropriate receipts difference revisal, and high optical property photographic lens can be provided.

The present invention can be applicable among the small-sized field of machines of Portable of high optical property, especially on the mobile phone.

Claims (8)

1. double-piece photographic lens begins to be arranged in order from the thing side and is aperture, first eyeglass (Lens), second eyeglass (Lens); It is characterized in that:

First eyeglass (Lens) is the positive half-crescent shape of convex surface towards the thing side;

Second eyeglass (Lens) is the negative half-crescent shape of convex surface towards the picture side;

And first eyeglass (Lens) and second eyeglass (Lens) are the glass lens of both-sided aspherical, and formula meets the following conditions:

0.55＜f1/f＜0.95；

-2.0＜f2/f＜-1.0；

27.0＜v1-v2；

Aforementioned f is that focal length, the f1 of whole optical system is that focal length, the f2 of first eyeglass (Lens) is that focal length, the v1 of second eyeglass (Lens) is that dispersion rate, the v2 of first eyeglass (Lens) is the dispersion rate of second eyeglass (Lens).

2. double-piece photographic lens according to claim 1 is characterized in that: more satisfy following conditional; 0.85＜TL/f＜1.15, aforementioned TL is the distance of the object side of first eyeglass (Lens) to image planes.

3. double-piece photographic lens according to claim 1 and 2 is characterized in that: more satisfy following conditional; 0.18＜d2/f＜0.32, aforementioned d2 is the interval of first eyeglass (Lens) and second eyeglass (Lens).

4. double-piece photographic lens according to claim 1 and 2 is characterized in that: more satisfy following conditional;

-3.65＜(r1+r2)/(r1-r2)＜-1.50；

Aforementioned r1 is that thing side radius-of-curvature, the r2 of first eyeglass (Lens) is the picture side radius-of-curvature of first eyeglass (Lens).

5. double-piece photographic lens according to claim 3 is characterized in that: more satisfy following conditional;

-3.65＜(r1+r2)/(r1-r2)＜-1.50；

Aforementioned r1 is that thing side radius-of-curvature, the r2 of first eyeglass (Lens) is the picture side radius-of-curvature of first eyeglass (Lens).

6. double-piece photographic lens according to claim 1 and 2 is characterized in that: more satisfy following conditional;-1.3＜r3/f＜-0.5; Aforementioned r3 is the thing side radius-of-curvature of second eyeglass (Lens).

7. double-piece photographic lens according to claim 3 is characterized in that: more satisfy following conditional;-1.3＜r3/f＜-0.5; Aforementioned r3 is the thing side radius-of-curvature of second eyeglass (Lens).

8. double-piece photographic lens according to claim 4 is characterized in that: more satisfy following conditional;-1.3＜r3/f＜-0.5; Aforementioned r3 is the thing side radius-of-curvature of second eyeglass (Lens).

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