CN102650726B - Pick-up lens - Google Patents
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- CN102650726B CN102650726B CN201110162331.1A CN201110162331A CN102650726B CN 102650726 B CN102650726 B CN 102650726B CN 201110162331 A CN201110162331 A CN 201110162331A CN 102650726 B CN102650726 B CN 102650726B
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Abstract
The invention provides wide-angle and the pick-up lens of distortion can be revised well.Be configured with in order from object side near optical axis for first lens (L1) of concave-concave shape, make near optical axis the meniscus shape convex surface facing object side negative the second lens (L2), near optical axis for the 3rd lens (L3) of biconvex shape, near optical axis for the 4th lens (L4) of concave-concave shape, be the 5th lens (L5) of biconvex shape near optical axis.In the structure shown here, the face of the object side of the second lens (L2) is formed as focal power along with the shape convex surface facing object side strengthened towards edge part from optical axis X, the face of the image planes side of the 5th lens (L5) is formed as the aspherical shape with flex point.
Description
Technical field
The present invention relates to the pick-up lens of the picture forming subject on the imaging apparatus such as ccd sensor or cmos sensor, relate to and be suitable for being assemblied in the pick-up lens in mobile phone, digital still camera, portable information terminal, security monitoring video camera, projector for real object, scanner, web camera etc.
Background technology
Due to the development of ICT (ICT (information and communication technology): Information and Communication Technology), sharedization of information and knowledge makes progress, and has occurred the ICT equipment based on this ICT in recent years.Wherein, can carry out to the planar object such as textbook or data and even three-dimensional object the projector for real object amplifying projection, namely so-called document camera (document camera) is popularized widely centered by the scene of educating or meeting room.Display data at one's side or material object directly can be amplified by document camera, so when such as using in meeting room, speaker can carry out flexible speech, and the participant as the opposing party easily can understand the content of speech, grasps the material object etc. as projection objects.
Document camera is many times placed on desk usually, so certainly desirably small-sized, and wishes to project subtly or show the information such as more word or figure.Therefore, for the pick-up lens be assemblied in document camera, requirement can tackle miniaturization and high resolving power, and requires the wide angle at the imaging field angle for tackling large image pickup scope.But, as high-resolution reply, while revising various aberration well, seek miniaturization, and the wide angle will seeking imaging field angle is difficult.Such as, when seeking the miniaturization of pick-up lens, because power of lens one by one strengthens, so be difficult to revise various aberration well.Therefore, when actual design pick-up lens, it is important that balance meets these requirements well.
As the pick-up lens that imaging field angle is large, the such as known pick-up lens recorded in patent documentation 1.This pick-up lens is configured with in order from object side to be had front group of negative focal power and has rear group of positive focal power and form.Front group is made up of the second negative lens of the first lens of concave-concave shape and the meniscus shape of concave surface facing object side, and rear group is made up of the 5th lens of the 3rd lens of biconvex shape, the 4th lens of concave-concave shape and biconvex shape.In the structure shown here, by the synthesis focal length of the synthesis focal length of front group relative to the ratio of the focal length of whole lens system and rear group is suppressed in the preferred range respectively relative to the ratio of the focal length of whole lens system, the increase of the distortion of accompanying with this wide angle can be suppressed while the wide angle of seeking imaging field angle.
[patent documentation 1] Japanese Unexamined Patent Publication 2009-134175 publication
Summary of the invention
For the pick-up lens assembled in above-mentioned document camera, be strongly required verily to the ability that the form of projection objects thing is made a video recording.According to the pick-up lens that above-mentioned patent documentation 1 is recorded, although diagonal field of view angular width reaches about 130 °, but distortion is comparatively large, so be difficult to the form of verily taking projection objects thing.
Taking into account of the wide angle of such photography field angle and the good correction of distortion, not being problem specific to the pick-up lens that assembles in above-mentioned document camera, is also common problem in the equipment that digital still camera, portable information terminal, security monitoring video camera, scanner, web camera etc. are less in the pick-up lens assembled.
The present invention proposes in view of the problem of above-mentioned prior art, its object is to provide a kind of wide-angle and can revise the pick-up lens of distortion well.
In order to solve above-mentioned problem, in the present invention, be configured with first lens with negative focal power in order to image planes side from object side, there are the second lens of negative focal power, there are the 3rd lens of positive focal power, there are the 4th lens of negative focal power, 5th lens with positive focal power are formed, be the radius-of-curvature in the face of image planes side the first lens forming be positive shape, the face being object side the second lens forming becomes focal power along with the shape convex surface facing object side strengthened from optical axis towards edge part, and the radius-of-curvature in the face of image planes side is positive shape, the radius-of-curvature being the face of object side the 3rd lens forming is just, the radius-of-curvature in the face of image planes side is negative shape, the radius-of-curvature being the face of object side the 4th lens forming is negative, the radius-of-curvature in the face of image planes side is positive shape, the radius-of-curvature being the face of object side the 5th lens forming is just, the radius-of-curvature in the face of image planes side is negative shape, and the face of this image planes side is formed as the aspherical shape with flex point.
As pick-up lens, according to this structure, sought the wide angle at imaging field angle by first lens with negative focal power and second lens equally with negative focal power.In addition, by the face of the face of the object side of the second lens and the image planes side of the 5th lens, the distortion produced in the first lens is revised suitably.
In the pick-up lens of said structure, wish that the mode weakened with focal power compared with each lens of the first lens, the 3rd lens, the 4th lens and the 5th lens forms the second lens.Generally from object side, configure two lens with negative focal power in order, when the focal length of whole lens system is kept certain while relatively strengthen the power of lens being configured in image planes side time, the position of the principal point of whole lens system is mobile to the direction (image planes side) away from the second lens, so back focal length is elongated.Such lens construction is unfavorable for the miniaturization of pick-up lens.Therefore, in the present invention, by making the second power of lens the most weak in whole lens system, while balance seeks the wide angle at imaging field angle and the correction of distortion well, the miniaturization of pick-up lens can be realized.
In the pick-up lens of said structure, the focal length of whole lens system is being set to f, when the focal length of the second lens is set to f2, is iting is desirable to satisfy the following conditional expression (1).
-40＜f2/f＜-5(1)
Conditional (1) is the condition of the miniaturization for more suitably seeking pick-up lens.When exceeding higher limit "-5 ", the second power of lens strengthens compared with the focal power of whole lens system, so the effective diameter of the first lens increases, is difficult to the miniaturization seeking pick-up lens.On the other hand, when lower than lower limit "-40 ", second power of lens weakens compared with the focal power of whole lens system, be conducive to the miniaturization of pick-up lens, but the chromatic aberation of multiplying power becomes revises deficiency (relative to reference wavelength, short wavelength increases to negative direction), be difficult to obtain good imaging performance.
In the pick-up lens of said structure, the radius-of-curvature in the face of the image planes side of the first lens is being set to R2, when the radius-of-curvature in the face of the object side of the second lens is set to R3, is iting is desirable to meet following conditional
(2)。
0.01＜R2/R3＜0.4(2)
Conditional (2) is for distortion is suppressed in good scope, simultaneously in the lump the condition that astigmatism suppresses in good scope.When exceeding higher limit " 0.4 ", effective for the distortion revising barrel-shaped (bearing), but meridian ellipse swings to negative direction (object side), and astigmatic difference increases.Therefore, be difficult to astigmatism to suppress in good scope.On the other hand, when lower than lower limit " 0.01 ", barrel-shaped distortion increases, and meridian ellipse swings to positive dirction (image planes side).Now, astigmatic difference also increases, so be difficult to astigmatism to suppress in good scope.
In the pick-up lens of said structure, when the focal length of the first lens is set to f1, when the focal length of the second lens is set to f2, it is desirable to meet following conditional (3).
0.02＜f1/f2＜0.8(3)
Conditional (3) is for revising curvature of the image, simultaneously the condition that the chromatic aberation of multiplying power suppresses in good scope.When exceeding higher limit " 0.8 ", the first power of lens weakens relatively compared with the second lens, effective for the chromatic aberation revising multiplying power, but because image planes swing to negative direction (object side), so be difficult to obtain good imaging performance.On the other hand, when lower than lower limit " 0.02 ", the first power of lens strengthens relatively compared with the second lens, so the chromatic aberation of multiplying power becomes revise deficiency.In addition, image planes swing to positive dirction (image planes side), and astigmatic difference increases.Therefore, be now also difficult to obtain good imaging performance.
In the pick-up lens of this structure, by meeting following conditional (3A) further, distortion and astigmatism can be suppressed in better scope.
0.02＜f1/f2＜0.5(3A)
In the pick-up lens of upper structure, the focal length of whole lens system is being set to f, when the focal length of the 3rd lens is set to f3, is iting is desirable to meet following conditional (4).
0.5＜f3/f＜1.2(4)
Conditional (4) is for chromatic aberation is suppressed in good scope, astigmatism and curvature of the image is suppressed the condition in good scope simultaneously.When exceeding higher limit " 1.2 ", relative to the focal power of whole lens system, the 3rd power of lens weakens, and the chromatic aberation on axle becomes revises surplus (relative to reference wavelength, short wavelength increases to positive dirction), the chromatic aberation outside axle becomes revises deficiency.In addition, because image planes swing to positive dirction, so be difficult to curvature of the image to suppress in good scope.And, because astigmatic difference increases, so be also difficult to astigmatism to suppress in good scope.On the other hand, when lower than lower limit " 0.5 ", relative to the focal power of whole lens system, the 3rd power of lens strengthens, and the chromatic aberation therefore on axle becomes revises deficiency.In addition, image planes swing to negative direction, and astigmatism also increases.Therefore, be in either case all difficult to obtain good imaging performance.
In the pick-up lens of said structure, the face of the image planes side from the second lens is being set to df to the distance on the optical axis in the face of the object side of the 3rd lens, when the face of the image planes side from the 3rd lens is set to dr to the distance on the optical axis in the face of the object side of the 4th lens, it is desirable to satisfy the following conditional expression (5).
0.8＜df/dr＜2.5(5)
Conditional (5) well the chromatic aberation of multiplying power and distortion is suppressed in good scope for balancing, and the condition that astigmatism suppresses in good scope.When exceeding higher limit " 2.5 ", the chromatic aberation of multiplying power becomes revises not enough and barrel-shaped distortion increase, is difficult to obtain good imaging performance.On the other hand, when lower than lower limit " 0.8 ", although effective for the correction of chromatic aberation and barrel-shaped distortion, image planes swing to negative direction and astigmatic difference increases, and are now also difficult to obtain good imaging performance.
In the pick-up lens of said structure, the focal length of whole lens system is being set to f, when the synthesis focal length of the 4th lens and the 5th lens is set to f45, is iting is desirable to satisfy the following conditional expression (6).
5＜f45/f＜15(6)
Conditional (6) is for suppressing in preset range from the light of pick-up lens outgoing to the incident angle of imaging apparatus, and revises the condition of curvature of the image.As everyone knows, for the light that can be taken in imaging apparatus, textural at imaging apparatus, as the boundary of incident angle aspect, is provided with so-called maximum incident angle degree.When the extraneous light of this maximum incident angle degree is to imaging apparatus, because shade (shading) phenomenon becomes the dark image of periphery.Therefore, need to suppress in preset range from the light of pick-up lens outgoing to the incident angle of imaging apparatus.
In conditional (6), when exceeding higher limit " 15 ", relative to the focal power of whole lens system, the synthesis focal power of the 4th lens and the 5th lens weakens relatively, increase from the injection angle of the light of pick-up lens outgoing, be difficult to suppress in preset range from the light of pick-up lens outgoing to the incident angle of imaging apparatus.In addition, because image planes swing to positive dirction, so be difficult to obtain good imaging performance.On the other hand, when lower than lower limit " 5 ", relative to the focal power of whole lens system, the synthesis focal power of the 4th lens and the 5th lens strengthens relatively, can easily suppress in preset range from the light of pick-up lens outgoing to the incident angle of imaging apparatus, but image planes swing to negative direction and astigmatic difference increases.Therefore, be now also difficult to obtain good imaging performance.
In the pick-up lens of said structure, the Abbe number of the 4th lens is being set to ν d4, when the Abbe number of the 5th lens is set to ν d5, is iting is desirable to satisfy the following conditional expression (7).
ν d4 < 35 and 45 < ν d5 < 80 (7)
Conditional (7) is the condition for chromatic aberation is suppressed in good scope.When scope beyond conditional (7), on axle and outside axle, chromatic aberation all becomes to be revised not enough, is difficult to obtain good imaging performance.
In addition, in the pick-up lens of this structure, the Abbe number of the first lens is being set to ν d1, the Abbe number of the second lens is being set to ν d2, when the Abbe number of the 3rd lens is set to ν d3, iting is desirable to also to satisfy the following conditional expression (8).
45 < ν d1 < 80,45 < ν d2 < 80 and 45 < ν d3 < 80 (8)
Conditional (8) is the condition for chromatic aberation is suppressed in better scope.When exceeding the scope of conditional (8), on axle and outside axle, chromatic aberation all becomes revises deficiency, is difficult to obtain good imaging performance.
In addition, in the pick-up lens of said structure, the focal length of the 4th lens is being set to f4, when the focal length of the 5th lens is set to f5, is iting is desirable to satisfy the following conditional expression (9).
-1.5＜f4/f5＜-0.5(9)
Conditional (9) is for chromatic aberation and astigmatism are suppressed the condition in good scope.When exceeding higher limit "-0.5 ", chromatic aberation becomes revises surplus.In addition, meridian ellipse swings to positive dirction, and astigmatic difference increases.Therefore, be difficult to obtain good imaging performance.On the other hand, when lower than lower limit "-1.5 ", chromatic aberation becomes revises deficiency.In addition, meridian ellipse swings to negative direction, and astigmatic difference also increases.Therefore, be now also difficult to obtain good imaging performance.
According to pick-up lens of the present invention, can wide-angle be provided and have modified the pick-up lens of distortion well.
Accompanying drawing explanation
Fig. 1 is about an embodiment of the invention, represents the camera lens sectional view of the Sketch of the pick-up lens of numerical example 1.
Fig. 2 is the aberration diagram of the lateral aberration representing the pick-up lens shown in Fig. 1.
Fig. 3 is the aberration diagram representing the spherical aberration of the pick-up lens shown in Fig. 1, astigmatism, distortion.
Fig. 4 is about same embodiment, represents the camera lens sectional view of the Sketch of the pick-up lens of numerical example 2.
Fig. 5 is the aberration diagram of the lateral aberration representing the pick-up lens shown in Fig. 4.
Fig. 6 is the aberration diagram representing the spherical aberration of the pick-up lens shown in Fig. 4, astigmatism, distortion.
Fig. 7 is about same embodiment, represents the camera lens sectional view of the Sketch of the pick-up lens of numerical example 3.
Fig. 8 is the aberration diagram of the lateral aberration representing the pick-up lens shown in Fig. 7.
Fig. 9 is the aberration diagram representing the spherical aberration of the pick-up lens shown in Fig. 7, astigmatism, distortion.
Figure 10 is about same embodiment, represents the camera lens sectional view of the Sketch of the pick-up lens of numerical example 4.
Figure 11 is the aberration diagram of the lateral aberration representing the pick-up lens shown in Figure 10.
Figure 12 is the aberration diagram representing the spherical aberration of the pick-up lens shown in Figure 10, astigmatism, distortion.
Figure 13 is about same embodiment, represents the camera lens sectional view of the Sketch of the pick-up lens of numerical example 5.
Figure 14 is the aberration diagram of the lateral aberration representing the pick-up lens shown in Figure 13.
Figure 15 is the aberration diagram representing the spherical aberration of the pick-up lens shown in Figure 13, astigmatism, distortion.
Symbol description
L1: the first lens
L2: the second lens
L3: the three lens
L4: the four lens
L5: the five lens
10: optical filter
Embodiment
Below, describe in detail with reference to accompanying drawing and the present invention is specialized and an embodiment obtaining.
Fig. 1, Fig. 4, Fig. 7, Figure 10, Figure 13 represent the camera lens sectional view corresponding to numerical example 1 ~ 5 of present embodiment respectively.Whichever numerical example, basic lens construction is all identical, so the lens construction of the pick-up lens of present embodiment is described at this camera lens sectional view with reference to numerical example 1.
As shown in Figure 1, the pick-up lens of present embodiment, is arranged the first lens L1 with negative focal power, the second lens L2 with negative focal power in order, has the 3rd lens L3 of positive focal power, has the 4th lens L4 of negative focal power and have the 5th lens L5 of positive focal power and form from object side to image planes side.Optical filter 10 is configured between the 5th lens L5 and image planes IM.Also this optical filter 10 can be omitted.In addition, in the pick-up lens of present embodiment, the face of the image planes side of the 3rd lens L3 is provided with aperture diaphragm.
In the pick-up lens of said structure, the radius of curvature R 1 the first lens L1 being formed as the face of object side is negative, and the radius of curvature R 2 in the face of image planes side is positive shape, near optical axis X, namely become the shape of biconcave lens.The face of the object side of the first lens L1 of present embodiment is formed as the aspherical shape with flex point (inflection point).That is, the face of the object side of the first lens L1, becomes the shape of concave surface facing object side near optical axis X, becomes the shape convex surface facing object side at edge part.In the present embodiment, near 50% of the maximum effective diameter of the first lens L1, flex point is provided with.In addition, not the shape of these first lens L1 is defined as the shape of present embodiment.As long as the radius of curvature R 2 in the face of the shape image planes side of the first lens L1 is positive shape, above-mentioned radius of curvature R 1 can be formed as and above-mentioned radius of curvature R 2 is all positive shape, namely near optical axis X convex surface facing the shape of the meniscus shaped lens of object side.
The radius of curvature R 4 second lens L2 being formed as the radius of curvature R 3 in the face of object side and the face of image planes side is all positive shape, near optical axis X, namely become the shape of the meniscus shaped lens convex surface facing object side.The face of the object side of the second lens L2 of present embodiment is aspheric surface, is formed as focal power along with the shape convex surface facing object side strengthened towards edge part from optical axis X.That is, the face of the object side of the second lens L2 is formed as the aspherical shape diminished to rims of the lens portion sweep from optical axis X.In addition, not the shape of these second lens L2 is defined as the shape of present embodiment.As long as the radius of curvature R 4 in the face of the shape image planes side of the second lens L2 is positive shape, it is negative for can being formed as above-mentioned radius of curvature R 3, and above-mentioned radius of curvature R 4 is positive shape, near optical axis X, namely become the shape of biconcave lens.
In the present embodiment, the mode weakened with focal power compared with each lens of the first lens L1, the 3rd lens L3, the 4th lens L4 and the 5th lens L5 forms above-mentioned second lens L2.Thereby, it is possible to balance seeks the wide angle at imaging field angle and the correction of distortion well, and seek the miniaturization of pick-up lens suitably.
The radius of curvature R 5 3rd lens L3 being formed as the face of object side is just, the radius of curvature R 6 in the face of image planes side is negative shape, near optical axis X, namely become the shape of biconvex lens.
The radius of curvature R 7 4th lens L4 being formed as the face of object side is negative, and the radius of curvature R 8 in the face of image planes side is positive shape, near optical axis X, namely become the shape of biconcave lens.In addition, the radius of curvature R 9 the 5th lens L5 being formed as the face of object side is just, the radius of curvature R 10 in the face of image planes side is negative shape, near optical axis X, namely become the shape of biconvex lens.In the present embodiment, the face of the image planes side of the 5th lens L5 is formed the aspherical shape with flex point.That is, the face of the image planes side of the 5th lens L5, becomes the shape convex surface facing image planes side near optical axis X, becomes the shape of concave surface facing image planes side at edge part.In the present embodiment, near 60% of the maximum effective diameter of the 5th lens L5, flex point is provided with.The shape in the face of the shape in the face of such shape in the face of the image planes side of the 5th lens L5 and the object side of above-mentioned first lens L1 and the object side of above-mentioned second lens L2 together contributes to revising distortion well.Specifically, the off-axis ray inciding the first lens L1 through the face of the face of object side of the first lens L1, the face of the object side of the second lens L2 and the image planes side of the 5th lens L5, revises its light path successively thus.As a result, distortion is suppressed in good scope.In addition, according to such shape of the 5th lens L5, suppress in preset range from the light of the 5th lens L5 outgoing to the incident angle of image planes IM.
The pick-up lens of present embodiment meets conditional (1) ~ (9) shown below.Therefore, pick-up lens according to the present embodiment, achieves the wide angle of pick-up lens and taking into account of good lens error correction.
-40＜f2/f＜-5 (1)
0.01＜R2/R3＜0.4 (2)
0.02＜f1/f2＜0.8 (3)
0.5＜f3/f＜1.2 (4)
0.8＜df/dr＜2.5 (5)
5＜f45/f＜15 (6)
νd4＜35、45＜νd5＜80 (7)
45 < ν d1 < 80,45 < ν d2 < 80 and 45 < ν d3 < 80 (8)
Wherein,
F: the focal length of whole lens system
The focal length of the f1: the first lens L1
The focal length of the f2: the second lens L2
The focal length of the f3: the three lens L3
The synthesis focal length of the f45: the four lens L4 and the 5th lens L5
The radius-of-curvature in the face of the image planes side of the R2: the first lens L1
The radius-of-curvature in the face of the object side of the R3: the second lens L2
Df: the distance the optical axis from the face of the image planes side of the second lens L2 to the face of the object side of the 3rd lens L3
Dr: the distance the optical axis from the face of the image planes side of the 3rd lens L3 to the face of the object side of the 4th lens L4
The Abbe number of ν d1: the first lens L1
The Abbe number of ν d2: the second lens L2
The Abbe number of ν d3: the three lens L3
The Abbe number of ν d4: the four lens L4
The Abbe number of ν d5: the five lens L5
In the pick-up lens of present embodiment, in order to distortion and astigmatism are suppressed in better scope, satisfy the following conditional expression (3A).
0.02＜f1/f2＜0.5(3A)
In addition, in the pick-up lens of present embodiment, the focal length of the 4th lens is being set to f4, when the focal length of the 5th lens is set to f5, is satisfying the following conditional expression (9).
-1.5＜f4/f5＜-0.5(9)
Above-mentioned whole conditional (1) ~ (9) of demand fulfillment (comprising conditional (3A), identical below), by meeting each conditional individually, can not obtain the action effect corresponding with each conditional respectively.
In the present embodiment, the lens face of each lens is defined as required by aspheric surface.The aspherical shape adopted in these lens, is set to Z at the axle optical axis direction, and the height in the direction vertical with optical axis is set to H, circular cone coefficient is set to k, asphericity coefficient is set to A
4, A
6, A
8, A
10, A
12, A
14time, represented by following formula.
[mathematical expression 1]
Then, the numerical example of the pick-up lens of present embodiment is represented.In each numerical example, f represents the focal length of whole lens system, and Fno represents F value (F number), and ω represents half picture angle.In addition, i represents the face numbering from object side counting, and R represents radius-of-curvature, and d represents the distance (interval, face) between the lens face along optical axis, and Nd represents the refractive index for d line, and ν d represents the Abbe number for d line.In addition, for aspheric, after the numbering i of face, additional * (asterisk) symbol represents.
Numerical example 1
Below represent basic lens data.
f＝2.84mm、Fno＝2.44、ω＝46.9°
f1＝-3.53mm
f2＝-100.00mm
f3＝2.47mm
f4＝-2.55mm
f5＝3.02mm
f45＝24.28mm
Aspherical surface data
1st
k＝0.000，A
4＝3.446E-02，A
6＝-3.599E-03，A
8＝-8.291E-05，
A
10＝1.543E-05
2nd
k＝0.000，A
4＝1.750E-02，A
6＝-1.105E-02，A
8＝3.441E-02，
A
10＝-1.719E-02，A
12＝3.262E-03
3rd
k＝0.000，A
4＝-3.026E-02，A
6＝3.233E-02，A
8＝-1.004E-02，
A
10＝2.042E-03
4th
k＝0.000，A
4＝3.205E-02，A
6＝-3.662E-03，A
8＝8.714E-03，
A
10＝-2.056E-03
5th
k＝0.000，A
4＝2.103E-02，A
6＝-3.153E-02，A
8＝3.669E-02，
A
10＝-2.507E-02，A
12＝5.415E-03
6th
k＝-6.021，A
4＝-2.650E-02，A
6＝1.713E-03，A
8＝1.064E-02，
A
10＝-1.641E-02，A
12＝6.241E-03
7th
k＝0.000，A
4＝-1.003E-01，A
6＝2.765E-03，A
8＝-5.120E-02，
A
10＝9.268E-02，A
12＝-4.181E-02
8th
k＝0.000，A
4＝-6.169E-02，A
6＝-2.045E-02，A
8＝1.781E-02，
A
10＝-3.303E-03，A
12＝-2.295E-04
9th
k＝0.000，A
4＝6.242E-02，A
6＝-1.454E-02，A
8＝-6.595E-03，
A
10＝6.315E-03，A
12＝-1.348E-03
10th
k＝0.000，A
4＝3.200E-02，A
6＝1.686E-03，A
8＝1.200E-02，
A
10＝1.294E-03，A
12＝-1.979E-03，A
14＝2.615E-04
Below represent the value of each conditional.
f2/f＝-35.21
R2/R3＝0.36
f1/f2＝0.035
f3/f＝0.87
df/dr＝1.72
f45/f＝8.55
f4/f5＝-0.84
So, the pick-up lens of this numerical example 1 satisfies condition formula (1) ~ (9).In addition, the distance (air characteristic chamber length) the optical axis X from the face of the object side of the first lens L1 to image planes IM is 9.82mm, achieves the miniaturization of pick-up lens.
Fig. 2, about the pick-up lens of numerical example 1, is divided into the lateral aberration (identical in Fig. 5, Fig. 8, Figure 11 and Figure 14) that meridian direction and sagitta of arc direction represent corresponding relative to the ratio H (hereinafter referred to as " image height is than H ") of maximum image height with each image height.In addition, Fig. 3, about the pick-up lens of numerical example 1, show respectively spherical aberration (mm), astigmatism (mm) and distortion (%).In these aberration diagrams, in spherical aberration diagram, illustrate the aberration amount corresponding with each wavelength of g line (435.84nm), F line (486.13nm), e line (546.07nm), d line (587.56nm), C line (656.27nm), in astigmatism figure, show respectively the aberration amount in sagittal image surface S and the aberration amount (identical in Fig. 6, Fig. 9, Figure 12 and Figure 15) in meridianal image surface T.As shown in FIG. 2 and 3, according to the pick-up lens of this numerical example 1, revise image planes well, revise each aberration suitably.
Numerical example 2
Below represent basic lens data.
f＝2.84mm、Fno＝2.46、ω＝46.9°
f1＝-3.47mm
f2＝-90.04mm
f3＝2.48mm
f4＝-2.58mm
f5＝3.03mm
f45＝28.01mm
Aspherical surface data
1st
k＝0.000，A
4＝3.517E-02，A
6＝-3.879E-03，A
8＝-4.207E-05，
A
10＝1.425E-05
2nd
k＝0.000，A
4＝1.750E-02，A
6＝-1.105E-02，A
8＝3.441E-02，
A
10＝-1.719E-02，A
12＝3.262E-03
3rd
k＝0.000，A
4＝-3.105E-02，A
6＝3.378E-02，A
8＝-1.052E-02，
A
10＝2.170E-03
4th
k＝0.000，A
4＝3.205E-02，A
6＝-3.662E-03，A
8＝8.714E-03，
A
10＝-2.056E-03
5th
k＝0.000，A
4＝5.577E-03，A
6＝-8.975E-03，A
8＝-1.789E-04，
A
10＝-8.581E-05，A
12＝-1.741E-03
6th
k＝-4.450，A
4＝-3.024E-02，A
6＝1.075E-02，A
8＝-2.034E-02，
A
10＝1.403E-02，A
12＝-4.934E-03
7th
k＝0.000，A
4＝-1.075E-01，A
6＝-2.729E-02，A
8＝4.481E-02，
A
10＝-3.235E-03，A
12＝-7.411E-03
8th
k＝0.000，A
4＝-1.039E-01，A
6＝1.145E-02，A
8＝1.077E-03，
A
10＝-1.078E-04，A
12＝-2.254E-04
9th
k＝0.000，A
4＝5.538E-02，A
6＝-5.087E-03，A
8＝-1.266E-02，
A
10＝8.470E-03，A
12＝-1.670E-03
10th
k＝0.000，A
4＝3.103E-02，A
6＝5.686E-03，A
8＝9.425E-03，
A
10＝3.140E-03，A
12＝-2.706E-03，A
14＝3.394E-04
Below represent the value of each conditional.
f2/f＝-31.70
R2/R3＝0.36
f1/f2＝0.039
f3/f＝0.87
df/dr＝1.60
f45/f＝9.86
f4/f5＝-0.84
So, the pick-up lens of this numerical example 2 satisfies condition formula (1) ~ (9).In addition, the distance (air characteristic chamber length) the optical axis X from the face of the object side of the first lens L1 to image planes IM is 9.82mm, achieves the miniaturization of pick-up lens.
Fig. 5, about the pick-up lens of numerical example 2, represents the lateral aberration more corresponding than H with image height, and Fig. 6 show respectively spherical aberration (mm), astigmatism (mm) and distortion (%).As shown in figs.5 and 6, according to the pick-up lens of this numerical example 2, also revise image planes well in the same manner as numerical example 1, revise each aberration suitably.
Numerical example 3
Below represent basic lens data.
f＝2.88mm、Fno＝2.39、ω＝46.5°
f1＝-3.80mm
f2＝-26.87mm
f3＝2.47mm
f4＝-2.48mm
f5＝2.94mm
f45＝26.61mm
Aspherical surface data
1st
k＝0.000，A
4＝3.686E-02，A
6＝-5.745E-03，A
8＝1.870E-04，
A
10＝5.956E-06
2nd
k＝0.000，A
4＝1.751E-02，A
6＝-1.104E-02，A
8＝3.441E-02，
A
10＝-1.719E-02，A
12＝3.262E-03
3rd
k＝0.000，A
4＝-9.374E-03，A
6＝6.269E-02，A
8＝-2.628E-02，
A
10＝4.905E-03
4th
k＝0.000，A
4＝5.912E-02，A
6＝3.630E-02，A
8＝-1.591E-02，
A
10＝1.982E-03
5th
k＝0.000，A
4＝1.531E-02，A
6＝-1.525E-02，A
8＝1.315E-02，
A
10＝-9.891E-03，A
12＝1.540E-03
6th
k＝-4.370，A
4＝-1.958E-02，A
6＝3.714E-03，A
8＝-5.359E-03，
A
10＝3.662E-04，A
12＝7.524E-06
7th
k＝0.000，A
4＝-1.051E-01，A
6＝-1.030E-02，A
8＝2.021E-02，
A
10＝6.272E-03，A
12＝-9.737E-03
8th
k＝0.000，A
4＝-1.045E-01，A
6＝1.099E-02，A
8＝2.017E-03，
A
10＝-2.032E-03，A
12＝2.975E-04
9th
k＝0.000，A
4＝5.185E-02，A
6＝-1.019E-02，A
8＝-7.167E-03，
A
10＝5.543E-03，A
12＝-1.096E-03
10th
k＝0.000，A
4＝3.369E-02，A
6＝3.097E-03，A
8＝1.059E-02，
A
10＝1.521E-03，A
12＝-2.110E-03，A
14＝2.993E-04
Below represent the value of each conditional.
f2/f＝-9.33
R2/R3＝0.057
f1/f2＝0.14
f3/f＝0.86
df/dr＝1.61
f45/f＝9.24
f4/f5＝-0.84
So, the pick-up lens of this numerical example 3 satisfies condition formula (1) ~ (9).In addition, the distance (air characteristic chamber length) the optical axis X from the face of the object side of the first lens L1 to image planes IM is 9.81mm, achieves the miniaturization of pick-up lens.
Fig. 8, about the pick-up lens of numerical example 3, represents the lateral aberration more corresponding than H with image height, and Fig. 9 show respectively spherical aberration (mm), astigmatism (mm) and distortion (%).As shown in FIG. 8 and 9, according to the pick-up lens of this numerical example 3, also revise image planes well in the same manner as numerical example 1, revise each aberration suitably.
Numerical example 4
Below represent basic lens data.
f＝2.89mm、Fno＝2.41、ω＝46.3°
f1＝-3.69mm
f2＝-34.00mm
f3＝2.45mm
f4＝-2.44mm
f5＝2.97mm
f45＝39.98mm
Aspherical surface data
1st
k＝0.000，A
4＝3.687E-02，A
6＝-5.740E-03，A
8＝1.887E-04，
A
10＝6.376E-06
2nd
k＝0.000，A
4＝1.756E-02，A
6＝-1.098E-02，A
8＝3.442E-02，
A
10＝-1.719E-02，A
12＝3.263E-03
3rd
k＝0.000，A
4＝-9.178E-03，A
6＝6.269E-02，A
8＝-2.629E-02，
A
10＝4.902E-03
4th
k＝0.000，A
4＝5.879E-02，A
6＝3.639E-02，A
8＝-1.581E-02，
A
10＝2.045E-03
5th
k＝0.000，A
4＝1.545E-02，A
6＝-1.530E-02，A
8＝1.306E-02，
A
10＝-9.959E-03，A
12＝1.505E-03
6th
k＝-4.363，A
4＝-1.962E-02，A
6＝3.683E-03，A
8＝-5.399E-03，
A
10＝3.216E-04，A
12＝-3.783E-05
7th
k＝0.000，A
4＝-1.044E-01，A
6＝-1.076E-02，A
8＝1.963E-02，
A
10＝5.953E-03，A
12＝-9.788E-03
8th
k＝0.000，A
4＝-1.044E-01，A
6＝1.120E-02，A
8＝2.062E-03，
A
10＝-2.045E-03，A
12＝2.817E-04
9th
k＝0.000，A
4＝5.193E-02，A
6＝-1.016E-02，A
8＝-7.135E-03，
A
10＝5.560E-03，A
12＝-1.092E-03
10th
k＝0.000，A
4＝3.354E-02，A
6＝3.112E-03，A
8＝1.059E-02，
A
10＝1.515E-03，A
12＝-2.114E-03，A
14＝2.978E-04
Below represent the value of each conditional.
f2/f＝-11.76
R2/R3＝0.029
f1/f2＝0.11
f3/f＝0.85
df/dr＝1.64
f45/f＝13.83
f4/f5＝-0.82
So, the pick-up lens of this numerical example 4 satisfies condition formula (1) ~ (9).In addition, the distance (air characteristic chamber length) the optical axis X from the face of the object side of the first lens L1 to image planes IM is 9.79mm, achieves the miniaturization of pick-up lens.
Figure 11, about the pick-up lens of numerical example 4, represents the lateral aberration more corresponding than H with image height, and Figure 12 show respectively spherical aberration (mm), astigmatism (mm) and distortion (%).As shown in figs. 11 and 12, according to the pick-up lens of this numerical example 4, also revise image planes well in the same manner as numerical example 1, revise each aberration suitably.
Numerical example 5
Below represent basic lens data.
f＝2.82mm、Fno＝2.32、ω＝47.3°
f1＝-4.33mm
f2＝-14.26mm
f3＝2.45mm
f4＝-2.53mm
f5＝2.91mm
f45＝20.23mm
Aspherical surface data
1st
k＝0.000，A
4＝3.691E-02，A
6＝-5.744E-03，A
8＝1.841E-04，
A
10＝5.497E-06
2nd
k＝0.000，A
4＝1.960E-02，A
6＝-1.117E-02，A
8＝3.437E-02，
A
10＝-1.717E-02，A
12＝3.276E-03
3rd
k＝0.000，A
4＝-9.616E-03，A
6＝6.246E-02，A
8＝-2.636E-02，
A
10＝4.911E-03
4th
k＝0.000，A
4＝6.008E-02，A
6＝3.682E-02，A
8＝-1.586E-02，
A
10＝1.863E-03
5th
k＝0.000，A
4＝1.473E-02，A
6＝-1.537E-02，A
8＝1.323E-02，
A
10＝-9.785E-03，A
12＝1.598E-03
6th
k＝-4.383，A
4＝-1.953E-02，A
6＝3.724E-03，A
8＝-5.307E-03，
A
10＝4.546E-04，A
12＝1.197E-04
7th
k＝0.000，A
4＝-1.046E-01，A
6＝-9.770E-03，A
8＝2.043E-02，
A
10＝6.342E-03，A
12＝-9.673E-03
8th
k＝0.000，A
4＝-1.043E-01，A
6＝1.088E-02，A
8＝1.922E-03，
A
10＝-2.088E-03，A
12＝2.659E-04
9th
k＝0.000，A
4＝5.180E-02，A
6＝-1.019E-02，A
8＝-7.184E-03，
A
10＝5.529E-03，A
12＝-1.105E-03
10th
k＝0.000，A
4＝3.427E-02，A
6＝3.179E-03，A
8＝1.061E-02，
A
10＝1.529E-03，A
12＝-2.108E-03，A
14＝2.997E-04
Below represent the value of each conditional.
f2/f＝-5.06
R2/R3＝0.016
f1/f2＝0.30
f3/f＝0.87
df/dr＝1.71
f45/f＝7.17
f4/f5＝-0.87
So, the pick-up lens of this numerical example 5 satisfies condition formula (1) ~ (9).In addition, the distance (air characteristic chamber length) the optical axis X from the face of the object side of the first lens L1 to image planes IM is 9.77mm, achieves the miniaturization of pick-up lens.
Figure 14, about the pick-up lens of numerical example 5, represents the lateral aberration more corresponding than H with image height, and Figure 15 show respectively spherical aberration (mm), astigmatism (mm) and distortion (%).As shown in Figure 14 and Figure 15, according to the pick-up lens of this numerical example 5, also revise image planes well in the same manner as numerical example 1, revise each aberration suitably.
Therefore, time in the image pickup optical system that the pick-up lens of above-mentioned embodiment is used for being equipped with in mobile phone, digital still camera, portable information terminal, security monitoring video camera, projector for real object, scanner, web camera etc., high performance and the miniaturization of this video camera etc. can be taken into account.
The present invention, as pick-up lens, can be used in requiring miniaturization, wide angle, and requires the equipment of the good capability for correcting of distortion, the pick-up lens such as, be equipped with in the equipment such as document camera or scanner.
Claims (10)
1. a pick-up lens, is characterized in that,
Be configured with in order from object side to image planes side first lens with negative focal power, second lens with negative focal power, have positive focal power the 3rd lens, have negative focal power the 4th lens, have positive focal power the 5th lens and form
The radius-of-curvature being the face of image planes side described first lens forming is positive shape,
The face being object side described second lens forming becomes focal power along with the shape convex surface facing object side strengthened from optical axis towards edge part, and the radius-of-curvature in the face of this object side is just, and the radius-of-curvature in the face of image planes side is positive shape,
The radius-of-curvature being the face of object side described 3rd lens forming is that just the radius-of-curvature in the face of image planes side is negative shape,
The radius-of-curvature being the face of object side described 4th lens forming is negative, and the radius-of-curvature in the face of image planes side is positive shape,
The radius-of-curvature being the face of object side described 5th lens forming is that just the radius-of-curvature in the face of image planes side is negative shape, and the face of image planes side is formed as the aspherical shape with flex point.
2. pick-up lens according to claim 1, is characterized in that,
Described second lens are formed in the mode that focal power compared with each lens of described first lens, described 3rd lens, described 4th lens and described 5th lens weakens.
3. pick-up lens according to claim 1 and 2, is characterized in that,
The focal length of whole lens system is being set to f, when the focal length of described second lens is set to f2, is meeting
－40<f2/f<－5。
4. pick-up lens according to claim 1 and 2, is characterized in that,
The radius-of-curvature in the face of the image planes side of described first lens is being set to R2, when the radius-of-curvature in the face of the object side of described second lens is set to R3, is meeting
0.01<R2/R3<0.4。
5. pick-up lens according to claim 1 and 2, is characterized in that,
The focal length of described first lens is being set to f1, when the focal length of described second lens is set to f2, is meeting
0.02<f1/f2<0.8。
6. pick-up lens according to claim 1 and 2, is characterized in that,
The focal length of whole lens system is being set to f, when the focal length of described 3rd lens is set to f3, is meeting
0.5<f3/f<1.2。
7. pick-up lens according to claim 1 and 2, is characterized in that,
The face of the image planes side from described second lens is being set to df to the distance on the optical axis in the face of the object side of described 3rd lens, when the face of the image planes side from described 3rd lens is set to dr to the distance on the optical axis in the face of the object side of described 4th lens, is meeting
0.8<df/dr<2.5。
8. pick-up lens according to claim 1 and 2, is characterized in that,
The focal length of whole lens system is being set to f, when the synthesis focal length of described 4th lens and described 5th lens is set to f45, is meeting
5<f45/f<15。
9. pick-up lens according to claim 1 and 2, is characterized in that,
The Abbe number of described 4th lens is being set to ν d4, when the Abbe number of described 5th lens is set to ν d5, is meeting
νd4<35
45<νd5<80。
10. pick-up lens according to claim 9, is characterized in that,
The Abbe number of described first lens is being set to ν d1, the Abbe number of described second lens is being set to ν d2, when the Abbe number of described 3rd lens is set to ν d3, meeting
45<νd1<80
45<νd2<80
45<νd3<80。
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| JP2011-041392 | 2011-02-28 | ||
| JP2011041392A JP5584938B2 (en) | 2011-02-28 | 2011-02-28 | Imaging lens |
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| KR101452084B1 (en) | 2013-01-22 | 2014-10-16 | 삼성전기주식회사 | Subminiature optical system and portable device having the same |
| CN103969799B (en) * | 2013-12-18 | 2017-01-11 | 玉晶光电(厦门)有限公司 | Shooting device and optical imaging lens thereof |
| TWI475249B (en) | 2013-12-18 | 2015-03-01 | 玉晶光電股份有限公司 | Camera device and optical imaging lens thereof |
| KR101547461B1 (en) * | 2013-12-31 | 2015-08-27 | 주식회사 코렌 | Optical lens system |
| TWI570437B (en) * | 2015-06-26 | 2017-02-11 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI570434B (en) * | 2015-06-26 | 2017-02-11 | 先進光電科技股份有限公司 | Optical image capturing system |
| TWI570436B (en) * | 2015-06-26 | 2017-02-11 | 先進光電科技股份有限公司 | Optical image capturing system |
| CN105242383B (en) * | 2015-10-13 | 2017-11-24 | 利达光电股份有限公司 | Day and night confocal glass moulds hybrid lenses for a kind of large aperture |
| CN105278082B (en) * | 2015-11-19 | 2018-12-07 | 中山联合光电科技股份有限公司 | A kind of ultra-wide angle fish eye optical imaging lens |
| TWI660193B (en) * | 2015-11-27 | 2019-05-21 | 揚明光學股份有限公司 | Optical lens |
| TWI710815B (en) * | 2016-03-10 | 2020-11-21 | 先進光電科技股份有限公司 | Optical image capturing system |
| CN109477912B (en) | 2016-07-25 | 2022-02-18 | Lg伊诺特有限公司 | Light receiving device and laser radar |
| CN106597641B (en) * | 2017-01-22 | 2022-10-18 | 东莞市宇瞳光学科技股份有限公司 | Small-sized low-cost 4MP athermal prime lens |
| CN106932885A (en) * | 2017-04-11 | 2017-07-07 | 广东思锐光学股份有限公司 | A kind of fish eye lens |
| WO2021127899A1 (en) * | 2019-12-23 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
| WO2021134267A1 (en) * | 2019-12-30 | 2021-07-08 | 诚瑞光学(常州)股份有限公司 | Photographing optical lens |
| CN115268028A (en) * | 2022-08-30 | 2022-11-01 | 哈尔滨工业大学 | Flat-field telecentric scanning lens |
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| CN1749796A (en) * | 2004-09-17 | 2006-03-22 | 鸿富锦精密工业（深圳）有限公司 | The digital camera wide-angle lens |
| CN101276046A (en) * | 2007-03-30 | 2008-10-01 | 富士能株式会社 | Variable-power optical system and imaging device |
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| JP2004054013A (en) * | 2002-07-22 | 2004-02-19 | Nidec Copal Corp | Zoom lens |
| JP2009134175A (en) * | 2007-11-30 | 2009-06-18 | Olympus Imaging Corp | Image forming optical system |
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| CN1749796A (en) * | 2004-09-17 | 2006-03-22 | 鸿富锦精密工业（深圳）有限公司 | The digital camera wide-angle lens |
| CN101276046A (en) * | 2007-03-30 | 2008-10-01 | 富士能株式会社 | Variable-power optical system and imaging device |
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