CN101031836A - Imaging lens - Google Patents
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- CN101031836A CN101031836A CN 200580032903 CN200580032903A CN101031836A CN 101031836 A CN101031836 A CN 101031836A CN 200580032903 CN200580032903 CN 200580032903 CN 200580032903 A CN200580032903 A CN 200580032903A CN 101031836 A CN101031836 A CN 101031836A
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Abstract
A high-performance imaging lens where the overall length of a lens system can be reduced without increasing the number of lenses, which is compact, and whose aberration can be excellently corrected. The imaging lens has a lens system at least having a first lens, an aperture stop, and a second lens. The first lens has a convex surface on an object side lens surface, and the lens system satisfies the expressions of 0.5 < f1/f < 1.5 ...(1) 1.0 < f/r1 < 4.0 ...(2), where f1 is the focal length of the first lens, f the focal length of the lens system, r the curvature radius of the object side lens surface of the first lens. Further, the second lens (2) is a double-concave lens, and when at least either of the lens surfaces in each of the first lens (1) and the second lens (2) is an aspheric shape, the lens system satisfies the expressions of 0.6 < f1/f < 1.0 ...(3) 1.8 < (n-1)f/r1 < 2.5 ...(4), where n1 is the refraction factor of the first lens.
Description
Technical field
The present invention relates to carry the imaging len on digital camera cameras such as (DSC:digital still camera).
Background technology
In recent years, adopt the popularity rate of the digital camera of solid-state imaging element (solid-state image sensor) such as CCD and video camera etc. to rise.And, because carrying the quantity of communication apparatus, the mobile phone of described solid-state image sensor of lift-launch and imaging len and notebook computer etc. also increasing, so the requirement of the imaging len of its use is increased sharply.Along with the miniaturization of carrying the communication apparatus, slimming and high efficiency, the imaging len of its lift-launch also is required miniaturization, slimming and high efficiency simultaneously, also become the content that is required for the ease of popularizing cost degradation.
Two pieces of lens of available technology adopting are to satisfy the requirement to this.In TOHKEMY 2001-174701 communique and the TOHKEMY 2002-296495 communique described prior art is disclosed for example.
In addition, along with the mobile phone or the notebook computer of band camera function, and PDA etc. carries popularizing rapidly of communication apparatus, begins higher optical property is produced requirement.Therefore, various lens are developed as imaging len.These class lens are disclosed in, for example, and in TOHKEMY 2002-258155 communique and the TOHKEMY 2004-177628 communique.
Summary of the invention
Imaging len of the present invention is the imaging len that is made of the lens combination that comprises first lens, aperture diaphragm (aperturestop) and second lens at least, wherein,
First lens are the positive meniscus shaped lenses (positivemeniscus lens) that have convex surface on the object side lens face,
The focal length that makes first lens is that the focal length of f1, lens combination is that the radius-of-curvature of f, the first lens object side lens face is r1, and then lens combination satisfies following condition:
0.5＜f1/f＜1.5 ……(1)，
1.0＜f/r1＜4.0 ……(2)。
Imaging len of the present invention is the imaging len that constitutes by having the lens combination of aperture diaphragm, first lens and second lens successively at least from object side, wherein,
First lens are the positive meniscus shaped lenses that have convex surface on the object side lens face,
Second lens are biconcave lenss,
In any one lens of first lens and second lens, one of them side's lens face has aspherical shape,
The focal length that makes lens combination is that the focal length of f, first lens is that the refractive index (refractive index) of f1, first lens is r1 for the radius-of-curvature of the object side of n1, first lens, and then lens combination satisfies following two conditionals:
0.6＜f1/f＜1.0 ……(3)，
1.8＜(n1-1)f/r1＜2.5 ……(4)。
Description of drawings
What Fig. 1 represented is the sectional view of imaging len in the embodiment of the present invention 1.
What Fig. 2 A represented to Fig. 2 C is the aberration diagram about imaging len shown in Figure 1.
What Fig. 3 represented is the sectional view of imaging len in the embodiment of the present invention 2.
What Fig. 4 A represented to Fig. 4 C is the aberration diagram about imaging len shown in Figure 3.
What Fig. 5 represented is the sectional view of imaging len in the embodiment of the present invention 3.
What Fig. 6 A represented to Fig. 6 C is the aberration diagram about imaging len shown in Figure 5.
What Fig. 7 represented is the sectional view of imaging len in the embodiment of the present invention 4.
What Fig. 8 A represented to Fig. 8 C is the aberration diagram about imaging len shown in Figure 7.
Embodiment
At first, preferred implementation 1 and 2 of the present invention is described.
In the imaging len of described prior art, there is following problem.Promptly, disclosed imaging len is 2 pieces of versions in described TOHKEMY 2001-174701 communique and the TOHKEMY 2002-296495 communique, and the lens that constitute first lens become negative power (be also referred to as negative refraction power, negative focal length or only be called negative lens) or more weak positive (be also referred to as positive refracting power, positive focal length or only be called positive lens).Therefore, the lens total length is big with respect to the ratio of the focal length of lens combination, in TOHKEMY 2001-174701 communique in the disclosed imaging len, its lens total length is approximately 2.3 times with respect to the ratio of lens combination focal length, and in TOHKEMY 2002-296495 communique in the disclosed imaging len, its lens total length is approximately 1.6 times with respect to the ratio of lens combination focal length.Therefore, particularly, there is the problem that lacks the structure miniaturization as the imaging len that is used in the mobile phone with slimming demand etc.
The present invention proposes in view of above-mentioned prior art problems, and its purpose is to provide a kind of and shortens the total length of lens combination and have high performance imaging len.
The imaging len that the present invention relates to is by the imaging len that lens combination constituted that comprises first lens, aperture diaphragm and second lens at least, and first lens are the positive meniscus shaped lenses that have convex surface on the object side lens face.And the focal length that makes first lens is that the focal length of f1, lens combination is that the radius-of-curvature of f, the first lens object side lens face is r1, and then lens combination meets the following conditions:
0.5＜f1/f＜1.5 ……(1)，
1.0＜f/r1＜4.0 ……(2)。
The imaging len that relates to said structure is by two pieces of lens, that is: form lens combination as first lens of the meniscus shaped lens that just (has power, refracting power or focal length) that on the object side lens face, has convex surface and as second lens of the positive meniscus shaped lens that on the image-side lens face, has convex surface.In addition, aperture diaphragm is set at front (object side) or back (image-side) of first lens.
Herein, conditional among the present invention (1) is that the power (power) of preceding group (front lens) (first lens) of duplet lens system is configured into the fixed conditional of professional etiquette, is illustrated in when realizing miniaturization to carry out the condition that each aberration (aberration) is revised well.
That is, when the ratio of the focal distance f 1 of first lens and the focal distance f of lens combination surpasses going up in limited time of conditional (1), die down at the power configuration of preceding group (front lens) of lens combination, the total length of lens combination is elongated.On the contrary, when surpass conditional (1) following in limited time owing to strengthen, so forwardly each aberration of producing of lens can't be revised by back group (rear portion lens) (second lens) at the power configuration of preceding group (front lens) of lens combination.
In addition, the conditional among the present invention (2) is to carry out the defined terms formula at the power division of the object side lens face of first lens of lens combination, is illustrated in when having the height lens performance, can make it have the condition of good workability.
That is, when the proportionate relationship of the focal distance f of the radius-of-curvature r1 of the object side lens face of first lens and lens combination surpasses going up in limited time of conditional (2), the curvature of the first lens object side lens face is excessive, the processing of first lens difficulty that becomes.On the other hand, prescribe a time limit when surpassing the following of conditional (2), make the correction of distorting aberration become difficult, simultaneously, because it is big that the image incident angle in maximum visual angle becomes, particularly in the imaging len that uses solid-state imaging element, produce shade (shading) (limb darkening etc.), thereby can't improve the performance of lens.
Thus, the result who studies repeatedly through the inventor shows, by constituting lens combination by two pieces of lens, and the eligible formula of each parameter (1) of lens combination and can realize miniaturization, can carry out the correction of each aberration well by the formula of satisfying condition (1) (2), and,, and can develop the good imaging len of processability by the formula of satisfying condition (2).By adopting described lens combination, when miniaturization can be realized, can carry out good correction to each aberration.
Like this, according to relating to imaging len of the present invention, realize miniaturization by each parameter that constitutes lens combination and lens combination by two pieces of lens formula (1) that satisfies condition, can carry out good correction to each aberration by the formula of satisfying condition (1) (2), and, can improve processing characteristics by the formula of satisfying condition (2).
Below, with reference to accompanying drawing, preferred implementation of the present invention is described.
Embodiment 1
The sectional view of the imaging len that relates to embodiments of the present invention 1 that Fig. 1 represents.
The imaging len of present embodiment is made of the lens combination that begins to have successively first lens 101, aperture diaphragm 103 and second lens 102 from object side as shown in Figure 1.First lens 101 are the positive meniscus shaped lenses that have convex surface on object side lens face (first lens, first face) 106.Second lens are 102 to be the positive meniscus shaped lenses that have convex surface on image-side lens face (second lens, second face) 109.In addition, between the image-side lens face 109 of second lens 102 and imaging surface 105, dispose opticses (panel or light filter) 104 such as panel (faceplate) in the solid-state imaging elements such as CCD or light filter.
Each parameter value of imaging len in having the present embodiment of said structure is as shown in table 1.Herein, rj begins successively radius-of-curvature (mm) to j face sequence number Rj from object side.For face sequence number Rj, it when j is 1 the object side lens face 106 of first lens 101, when j is 2 image-side lens faces (first lens, second face) 107 of first lens 101, being object side lens faces (second lens, first face) 108 of second lens 102 when j is 3, is image-side lens faces 109 of second lens 101 when j is 4.Dj begins successively to the individual face Center Gap (mm) of j from object side.Nd is the refractive index of each lens in the d line (wavelength is the light of 0.58756 μ m), ν d is the Abbe number (abbe number) of each lens in the d line, f is the focal length (mm) of lens combination, and Fno. is full aperture F value (Full Aperture F Value), and L represents the total length (mm) of lens combination.Wherein, the other * of face sequence number represents aspheric surface.
In addition, order is x, is that h, paraxial radius-of-curvature are that r, the constant of the cone are that κ, the m time asphericity coefficient are A apart from the height of optical axis apart from the distance (sinkage (sag)) of the optical axis direction of the tangent plane of vertex of surface
m(m=4,6,8,10,12), then aspherical shape can be represented by following formula:
x＝{(1/r)h
2}/[1+{1-(1+κ)(1/r)
2h
2}
1/2]+A
4h
4+A
6h
6+A
8h
8+A
10h
10+A
12h
12……(X)。
Therefore, below show κ and A in the following formula (X)
mValue is carried out specific to aspherical shape.
[table 1]
f＝2.628、Fno＝3.2、L＝3.305
Lens data
| The face sequence number | rj | dj | Nd | νd |
| R1 * | 0.700 | |||
| 0.5 | 1.68985 | 52.83 | ||
| R2 * | 0.695 | |||
| 0.12 | ||||
| Aperture diaphragm | ∞ | |||
| 0.475 | ||||
| R3 * | -2.797 | |||
| 0.908 | 1.52997 | 55.73 | ||
| R4 * | -1.155 | |||
| 0.15 | ||||
| R5 | ∞ | |||
| 0.5 | 1.51680 | 64.20 | ||
| R6 | ∞ | |||
| 0.652 | ||||
| IMA | ∞ |
Asphericity coefficient
| R1 | R2 | R3 | R4 | |
| κ | 2.8317E-01 | 2.2685E+00 | 1.5921E+01 | 3.7023E-01 |
| A 4 | -4.9731E-02 | -1.1404E-01 | -4.1096E-01 | 3.3537E-02 |
| A 6 | 1.5962E-01 | -9.7563E-01 | 2.4183E+00 | -3.3923E-01 |
| A 8 | -6.8503E-01 | -1.0840E+01 | -8.0945E+00 | 6.2224E-01 |
| A 10 | 0.0000E+00 | 0.0000E+00 | 9.9482E+00 | -4.3038E-01 |
| A 12 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 |
In addition, in the present embodiment, the focal distance f 1 of first lens 101 is 3.542mm, and the focal distance f of lens combination is 2.628mm.Therefore, 0.5＜f1/f=1.34＜1.5, the formula that satisfies condition (1).In addition, the radius-of-curvature r1 of the object side lens face 106 of first lens 101 is 0.700mm.Therefore, 1.0＜f/r1=3.75＜4.0, the formula that satisfies condition (2).In addition, with the focal distance f of the total length L scioptics system of lens combination and the value L/f after standardizing is 1.26.Therefore, the total length L of lens combination is below 1.3 times of focal distance f, can realize the imaging len of very miniaturization.
What Fig. 2 A represented to Fig. 2 C is the aberration diagram about imaging len shown in Figure 1.That Fig. 2 A represents is spherical aberration (spherical aberration), and that Fig. 2 B represents is astigmatism (ast-igmatism), and what Fig. 2 C represented is to distort aberration.
In the present embodiment, compared with prior art, not only can realize the imaging len of very miniaturization, but also can carry out good correction each aberration.
In addition, in the lens combination of present embodiment, what lens face 106,107,108 and 109 adopted is the lens of aspheric surface, but the present invention is not limited thereto, also can carry out suitable selection to it.
In addition, first lens of the present invention and second lens preferably use resin material.All use resin material by all lens, manufacture and can reduce cost and be convenient to.
Embodiment 2
Below, the embodiment 2 that relates to imaging len of the present invention is described.
What Fig. 3 represented is the sectional view of the imaging len in the embodiment of the present invention 2.
Relating to the imaging len of present embodiment and the difference of embodiment 1 is: as shown in Figure 3, the position of the aperture diaphragm 103 of present embodiment is positioned at the shape difference of image-side lens face 109 of the place ahead (object side), second lens 102 of first lens 101 and the position of imaging surface 105 is positioned on the end face of optics (panel and light filter) 104.
Each parameter value of imaging len in having the present embodiment of said structure is as shown in table 2.Represent the meaning of each numerical value identical herein, with embodiment 1.
[table 2]
f＝2.323、Fno＝2.85、L＝2.632
Lens data
| The face sequence number | rj | dj | Nd | νd |
| Aperture diaphragm | ∞ | |||
| 0.05 | ||||
| R1 * | 0.782 | |||
| 0.572 | 1.606019 | 57.427987 | ||
| R2 * | 1.314 | |||
| 0.52 | ||||
| R3 * | 13.894 | |||
| 0.9 | 1.478 | 56 | ||
| R4 * | 3.442 | |||
| 0.24 | ||||
| R5 | ∞ | |||
| 0.4 | 1.516798 | 64.198258 | ||
| R6(IMA) | ∞ |
Asphericity coefficient
| R1 | R2 | R3 | R4 | |
| κ | -8.2257E-01 | 5.1816E-01 | 0.0000E+00 | 0.0000E+00 |
| A 4 | 1.8399E-01 | 4.1192E-01 | -6.2582E-01 | -4.6135E-01 |
| A 6 | 2.3617E+00 | 4.4581E+00 | 1.6949E-01 | 5.9372E-01 |
| A 8 | -2.2671E+01 | -4.7764E+01 | 1.9894E+00 | -7.9928E-01 |
| A 10 | 1.2446E+02 | 2.7136E+02 | -1.3495E+01 | 3.9079E-01 |
| A 12 | -2.4472E+02 | -4.2054E+02 | 1.7067E+01 | -6.0955E-02 |
Wherein, in the present embodiment, the focal distance f 1 of first lens 101 is 2.669mm, and the focal distance f of lens combination is 2.323mm.Therefore, 0.5＜f1/f=0.86＜1.5, the formula that satisfies condition (1).In addition, the radius-of-curvature r1 of the object side lens face 106 of first lens 101 is 0.782mm.Therefore, 1.0＜f/r1=2.97＜4.0, the formula that satisfies condition (2).In addition, with the focal distance f of the total length L scioptics system of lens combination and the value L/f after standardizing is 1.13.Therefore, the total length L of lens combination is below 1.3 times of focal distance f, can realize the imaging len of very miniaturization.
Fig. 4 A～Fig. 4 C represents is the aberration diagram of imaging len shown in Figure 3.What Fig. 4 A represented is spherical aberration, and what Fig. 4 B represented is astigmatism, and what Fig. 4 C represented is to distort aberration.
In the present embodiment, compared with prior art, not only can realize the imaging len of very miniaturization, but also can carry out good correction each aberration.
In addition, in the lens combination of present embodiment, what lens face 106,107,108 and 109 adopted is the lens of aspheric surface, but the present invention is not limited thereto, can carry out suitable selection to it.
Below, embodiments of the present invention 3 and embodiment 4 are described.
Recently, particularly follow described miniaturization of carrying the communication apparatus, for imaging len, the requirement of miniaturization and low cost is also more and more stronger more when having higher optical property.Therefore, people are desirably in and reduce lens piece number, also have the appearance above the imaging len of the height optical property of prior art when realizing miniaturization and simple for structureization.In addition, the glass cost is higher than more than the plastics cost twice, and when the processed glass lens, its bore is more little difficult more.
The present invention proposes in view of above-mentioned prior art problems, and its purpose is to provide a kind of does not increase lens piece number, can realize miniaturization and the imaging len that can well revise aberration.
Relate to imaging len of the present invention and be by begin to have aperture diaphragm successively from object side, the imaging len that lens combination constituted of first lens and second lens.Described first lens are the meniscus shaped lenses that protrude and have positive refracting power at object side.Described second lens are biconcave lenss.In any one lens in described first lens and second lens, one of them side's lens face has aspherical shape, and described lens combination meets the following conditions:
0.6＜f1/f＜1.0 ……(3)，
1.8＜(n1-1)f/r1＜2.5 ……(4)。
Wherein, f is the focal length of lens combination, and f1 is the focal length of first lens, and n1 is the refractive index of first lens, and r1 is the radius-of-curvature of face of the object side of first lens.
Herein, the conditional among the present invention (3) is that the focal length at first lens carries out the defined terms formula, is illustrated in when obtaining miniaturization, has the condition of good aberration performance.
That is,, be difficult to revise to distorting aberrations such as aberration when the ratio of the focal length of first lens and the focal length of lens combination is the lower limit of conditional (3) when following.Another is convenient, and when the higher limit that is conditional (3) was above, equipment integral was tending towards maximizing, and can't realize the miniaturization lens.
In addition, the conditional among the present invention (4) is that the refracting power at first lens carries out the defined terms formula, is illustrated in when obtaining miniaturization, has the condition of good aberration performance.
Promptly, setting (n1-1) f/r1 that relates to the focal distance f of the refractive index n 1 of radius-of-curvature r1, first lens of the object side of first lens and lens combination is that the lower limit of conditional (4) is when following, it is thick in the center thickness increase that the axle of first lens is gone up core, can't realize the lens of miniaturization.On the other hand, when the higher limit that is conditional (4) is above, be difficult to make an outer light beam, and make the correction of spherical aberration also become difficult fully by first lens.
According to imaging len of the present invention, satisfy condition formula (3) and conditional (4) and can to obtain total length very short by the very simple lens combination of structure that makes so-called two groups two pieces, be approximately focal length below 1.2 times and the imaging len with good aberration performance.
In addition, first lens of the present invention and second lens preferably all use resin material.All use resin material and can reduce cost and be convenient to and manufacture by all lens.
Below, with reference to accompanying drawing, preferred implementation of the present invention is described.
(embodiment 3)
The sectional view of the imaging len that relates to embodiments of the present invention 3 that Fig. 5 represents.
As shown in Figure 5, the imaging len of present embodiment is made of the lens combination that begins to have successively aperture diaphragm 503, first lens 501 and second lens 502 from object side.First lens 501 are the meniscus shaped lenses that protrude and have positive refracting power at object side lens face (first lens, first face) 506.Second lens 502 are biconcave lenss.In the present embodiment, first lens 501 and second lens 502 all use resin material, and any one lens face 506,507,508,509 all has aspherical shape.
Each parameter value of imaging len of present embodiment with described structure is as shown in table 3.
Herein, rj relates to begin successively radius-of-curvature (mm) to j face sequence number Rj from object side.Face sequence number R1 is that object side lens face 506, the R2 of first lens 501 is the image-side lens face (first lens, second face) 507 of first lens 501, the object side lens face (second lens, first face) 508 that R3 is second lens 502, the image-side lens face (second lens, second face) 509 that R4 is second lens 501.Dj begins successively Center Gap (mm) to j face from object side.Nd relates to the refractive index of the lens of d line, and ν d is the Abbe number of each lens of d line, and f is the focal length (mm) of lens combination, and Fno. is a full aperture F value.
In addition, order is x, is that h, paraxial radius-of-curvature are that r, the constant of the cone are that κ, the m time asphericity coefficient are A apart from the height of optical axis apart from the distance (sinkage (sag)) of the optical axis direction of the tangent plane of vertex of surface
m(m=4,6,8,10,12), then aspherical shape can be represented with following formula:
x＝{(1/r)h
2}/[1+{1-(1+κ)(1/r)
2h
2}
1/2]+A
4h
4+A
6h
6+A
8h
8+A
10h
10+A
12h
12……(X)。
Therefore, below show κ and A in the following formula (X)
mValue is carried out specific to aspherical shape.
[table 3]
f＝4.64，Fno＝4.02
Lens data
| The face sequence number | rj | dj | Nd | νd |
| Aperture diaphragm | ∞ | |||
| 0.00 | ||||
| R1 | 1.332 | |||
| 0.84 | 1.5247 | 56.40 | ||
| R2 | 2.608 | |||
| 1.06 | ||||
| R3 | -51.691 | |||
| 2.00 | 1.5247 | 56.40 | ||
| R4 | 7.318 | |||
| 1.06 | ||||
| IMA | ∞ |
Asphericity coefficient
| R1 | R2 | R3 | R4 | |
| κ | -1.7046E+00 | -6.2653E+01 | 0.0000E+00 | -2.5790E+00 |
| A 4 | 8.3075E-02 | 4.3744E-01 | -8.6810E-02 | -1.8699E-02 |
| A 6 | 1.3124E-01 | -7.0522E-01 | -1.2928E-02 | -5.8500E-03 |
| A 8 | -1.8008E-01 | 1.0322E+00 | 5.3340E-03 | 1.2880E-03 |
| A 10 | 9.4460E-04 | -4.4363E-02 | 5.7170E-02 | -1.3600E-05 |
| A 12 | 0.0000E+00 | 0.0000E+00 | 0.0000E+00 | 0.0000E-00 |
In addition, in the present embodiment, the focal distance f 1 of first lens 501 is 4.21mm, and the focal distance f of lens combination is 4.64mm.Therefore, 0.6＜f1/f=0.91＜1.0, the formula that satisfies condition (3).In addition, the refractive index n 1 of first lens 501 is that the radius-of-curvature r1 of the object side 506 of 1.5247, the first lens 501 is 1.332mm.Therefore, 1.8＜(n1-1) f/r1=1.83＜2.5, the formula that satisfies condition (4).
What Fig. 6 A～Fig. 6 C represented is the aberration diagram about imaging len shown in Figure 5.What Fig. 6 A represented is spherical aberration, and what Fig. 6 B represented is astigmatism, and what Fig. 6 C represented is to distort aberration.
As shown in Figure 6 because by the very simple lens combination of structure that makes two groups two pieces satisfy condition formula (21) and conditional (22), and can obtain to be approximately focal length below 1.2 times and very short and imaging len that have good aberration performance.In addition, because all lens all use resin material, manufacture so can reduce cost and be convenient to.
(the 4th embodiment)
The sectional view of the imaging len that relates to embodiment of the present invention 4 that Fig. 7 represents.
Present embodiment 4 adopts the lens combination identical with embodiment 3 and constitutes.Each parameter value (comprising asphericity coefficient) of imaging len in the present embodiment is shown in (table 4).
Wherein, in the present embodiment, the focal distance f 1 of first lens 501 is 3.316, and the focal distance f of lens combination is 4.11mm.Therefore, 0.6＜f1/f=0.81＜1.0, the formula that satisfies condition (3).In addition, the refractive index n 1 of first lens 501 is that the radius-of-curvature r1 of the object side lens face 506 of 1.5247, the first lens 501 is 1.154mm.Therefore, 1.8＜(n1-1) f/r1=1.87＜2.5, the formula that satisfies condition (4).
What Fig. 8 A～Fig. 8 C represented is the aberration diagram about imaging len shown in Figure 7.What Fig. 8 A represented is spherical aberration, and what Fig. 8 B represented is astigmatism, and what Fig. 8 C represented is to distort aberration.
[table 4]
f＝4.11，Fno＝4.03
Lens data
| The face sequence number | rj | dj | Nd | νd |
| Aperture diaphragm | ∞ | |||
| 0.00 | ||||
| R1 | 1.154 | |||
| 0.75 | 1.5247 | 56.40 | ||
| R2 | 2.636 | |||
| 0.41 | ||||
| R3 | -6.224 | |||
| 3.11 | 1.5247 | 56.40 | ||
| R4 | 25.748 | |||
| 0.62 | ||||
| IMA | ∞ |
Asphericity coefficient
| R1 | R2 | R3 | R4 | |
| κ | -1.0874E+00 | -5.0163E+00 | 0.0000E+00 | 0.0000E+00 |
| A 4 | 1.2063E-01 | 2.8418E-02 | -1.6794E-01 | 1.0059E-02 |
| A 6 | -6.8300E-03 | 8.5405E-01 | -1.3217E-01 | -1.3965E-02 |
| A 8 | 3.4094E-01 | 2.3830E+00 | 1.2616E-01 | 2.4960E-03 |
| A 10 | -3.3592E-02 | 3.1384E-01 | 4.6397E-02 | -1.6400E-05 |
| A 12 | 0.0000E+00 | 0.0000E+00 | -1.3222E-02 | 0.0000E+00 |
In the present embodiment kind, as Fig. 7, shown in Figure 8 because by making the very simple lens combination of two groups of two pieces of structures satisfy condition formula (3) and conditional (4), and can obtain to be approximately focal length below 1.2 times and imaging len very short and that have good aberration performance.In addition, because all lens all use resin material, manufacture so can reduce cost and be convenient to.
In addition, in above embodiment, arbitrary in first lens 501 and second lens 502 example that constitutes by aspherical shape described.But be not limited thereto, also can adopt following constituted mode, that is: at least any one party is an aspherical shape in the lens face 506 and 507 of first lens 501, and at least any one party of the lens face 508 of second lens 502 and 509 is an aspherical shape.
Utilizability on the industry
Imaging len of the present invention, its lens combination is made of two pieces of lens, can realize miniaturization and can well revise each aberration, and have good processability. Therefore, be suitable for using as carrying the imaging len in the devices such as digital camera and minicam.
Claims (5)
1. imaging len is characterized in that:
It is the imaging len that is made of the lens combination that comprises first lens, aperture diaphragm and second lens at least, wherein,
Described first lens are the positive meniscus shaped lenses that have convex surface on the object side lens face,
The focal length that makes described first lens is that the focal length of f1, described lens combination is that the radius-of-curvature of f, the described first lens object side lens face is r1, and then described lens combination satisfies following two conditions:
0.5＜f1/f＜1.5 ……(1)，
1.0＜f/r1＜4.0 ……(2)。
2. imaging len as claimed in claim 1 is characterized in that:
Described lens combination disposes described first lens, described aperture diaphragm and described second lens successively from object side, wherein,
Described second lens have positive refracting power.
3. imaging len as claimed in claim 1 is characterized in that:
Described lens combination disposes described aperture diaphragm, described first lens and described second lens successively from object side, wherein,
Described second lens are the negative meniscus lens.
4. an imaging len is characterized in that,
It is to have the lens combination of aperture diaphragm, first lens and second lens successively at least and the imaging len that constitutes from object side, wherein,
Described first lens are the positive meniscus shaped lenses that have convex surface on the object side lens face,
Described second lens are biconcave lenss,
In any one lens of described first lens and described second lens, one of them side's lens face has aspherical shape,
The focal length that makes lens combination is that the focal length of f, first lens is that the refractive index of f1, first lens is that the radius-of-curvature of the object side of n1, first lens is r1, and then described lens combination satisfies following two conditionals:
0.6＜f1/f＜1.0 ……(3)，
1.8＜(n1-1)f/r1＜2.5 ……(4)。
5. as each described imaging len in the claim 1 to 4, it is characterized in that:
Described first lens and second lens all use resin material.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004281830A JP2006098504A (en) | 2004-09-28 | 2004-09-28 | Photographing lens |
| JP281830/2004 | 2004-09-28 | ||
| JP368808/2004 | 2004-12-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101031836A true CN101031836A (en) | 2007-09-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200580032903 Pending CN101031836A (en) | 2004-09-28 | 2005-09-28 | Imaging lens |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2006098504A (en) |
| CN (1) | CN101031836A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393317B (en) * | 2007-09-21 | 2010-08-18 | 大立光电股份有限公司 | Double-piece photographic lens |
| CN102736216A (en) * | 2011-04-05 | 2012-10-17 | 夏普株式会社 | Image pickup lens and image pickup module |
| CN108415152A (en) * | 2015-11-16 | 2018-08-17 | 董润 | One kind wearing display and sets alternative optical eyepiece camera lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI411812B (en) * | 2006-03-31 | 2013-10-11 | Hitachi Maxell | Camera lens assembly |
| JP5022066B2 (en) * | 2006-03-31 | 2012-09-12 | 日立マクセル株式会社 | Imaging lens unit |
| JP4861797B2 (en) | 2006-11-21 | 2012-01-25 | 株式会社エンプラス | Imaging lens and imaging apparatus provided with the same |
| WO2008102773A1 (en) | 2007-02-19 | 2008-08-28 | Konica Minolta Opto, Inc. | Imaging lens, imaging device, portable terminal and method for manufacturing imaging lens |
| WO2008102648A1 (en) | 2007-02-19 | 2008-08-28 | Konica Minolta Opto, Inc. | Imaging lens, imaging device, and mobile terminal |
| EP2116882A4 (en) | 2007-02-19 | 2012-03-07 | Konica Minolta Opto Inc | Imaging lens, imaging device, portable terminal and method for manufacturing imaging lens |
| KR101008704B1 (en) | 2008-10-17 | 2011-01-17 | (주)이오시스템 | Objective lens system for thermal image device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3891837B2 (en) * | 2001-12-07 | 2007-03-14 | 株式会社長野光学研究所 | Photo lens with 2 elements in 2 groups |
| JP3595308B2 (en) * | 2002-02-07 | 2004-12-02 | 株式会社エンプラス | Imaging lens |
| JP2004170460A (en) * | 2002-11-15 | 2004-06-17 | Matsushita Electric Ind Co Ltd | Imaging optical system, and digital still camera using it, video camera and mobile equipment using same |
| JP3820213B2 (en) * | 2002-12-16 | 2006-09-13 | 株式会社エンプラス | Imaging lens |
| JP3593530B2 (en) * | 2002-12-06 | 2004-11-24 | 株式会社エンプラス | Imaging lens |
| JP3452919B1 (en) * | 2003-01-22 | 2003-10-06 | マイルストーン株式会社 | Imaging lens |
-
2004
- 2004-09-28 JP JP2004281830A patent/JP2006098504A/en active Pending
-
2005
- 2005-09-28 CN CN 200580032903 patent/CN101031836A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393317B (en) * | 2007-09-21 | 2010-08-18 | 大立光电股份有限公司 | Double-piece photographic lens |
| CN102736216A (en) * | 2011-04-05 | 2012-10-17 | 夏普株式会社 | Image pickup lens and image pickup module |
| CN108415152A (en) * | 2015-11-16 | 2018-08-17 | 董润 | One kind wearing display and sets alternative optical eyepiece camera lens |
| CN108415152B (en) * | 2015-11-16 | 2020-04-07 | 深圳市柏英特电子科技有限公司 | Optical eyepiece lens for head-mounted display equipment |
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| Publication number | Publication date |
|---|---|
| JP2006098504A (en) | 2006-04-13 |
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