CN103229086B - Imaging lens system and camera head - Google Patents
Imaging lens system and camera head Download PDFInfo
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- CN103229086B CN103229086B CN201280003492.9A CN201280003492A CN103229086B CN 103229086 B CN103229086 B CN 103229086B CN 201280003492 A CN201280003492 A CN 201280003492A CN 103229086 B CN103229086 B CN 103229086B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 117
- 230000005499 meniscus Effects 0.000 claims abstract description 12
- 230000014509 gene expression Effects 0.000 claims description 33
- 230000003287 optical effect Effects 0.000 claims description 23
- 239000011521 glass Substances 0.000 claims description 21
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 230000004075 alteration Effects 0.000 abstract description 37
- 102220028712 rs112992946 Human genes 0.000 description 27
- 238000010586 diagram Methods 0.000 description 19
- 102220221185 rs530961288 Human genes 0.000 description 18
- 201000009310 astigmatism Diseases 0.000 description 15
- 102220008985 rs193922564 Human genes 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 7
- 102220010919 rs397507454 Human genes 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
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- 238000000034 method Methods 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/003—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having two lenses
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Abstract
The invention provides a kind of imaging lens system and employ the camera head of this imaging lens system, this imaging lens system is that formability etc. is good and have modified the imaging lens system of two chip architectures of various aberration.Imaging lens system is made up of opening aperture, the first lens and the second lens successively from object side, above-mentioned first lens have convex surface at object side and have the positive meniscus lens of concave surface in image side, above-mentioned second lens are the negative lenses making face, paraxial concave surface facing image side, face, above-mentioned image side possesses aspheric surface, this aspheric surface has flex point and periphery has convex form, and this imaging lens system meets following conditional :-1.10 < (1-n1) f/r2 <-0.20 (1);-0.18 < (n2-1) f/r3 < 0.18 (2);-0.25 < (1-n2) f/r4 <-0.02 (3).Wherein, n1: above-mentioned first lens are relative to the line refractive index of d; N2: above-mentioned second lens are relative to the refractive index of d line; R2: the radius-of-curvature (mm) in above-mentioned first face, lens image side; R3: the radius-of-curvature (mm) of above-mentioned second lens object side; R4: the radius-of-curvature (mm) in above-mentioned second face, lens image side.
Description
Technical Field
The present invention relates to an imaging lens suitable for an imaging device using a solid-state imaging element such as a CCD (Charge Coupled device) type image sensor or a CMOS (Complementary metal oxide) type image sensor.
Background
In recent years, with the increase in performance and reduction in size of imaging devices using solid-state imaging devices such as CCD-type image sensors and CMOS-type image sensors, mobile phones (including smart phones) and portable information terminals equipped with imaging devices have become popular. Further, there is an increasing demand for further downsizing and high performance of the imaging lens mounted on the imaging device. Recently, such a mobile terminal is often equipped with two cameras, a high-pixel and high-performance main camera and a low-pixel and small-sized sub camera.
As an imaging lens for a main camera, imaging lenses having a three-to five-piece structure have been proposed because of the need for higher performance. On the other hand, as an imaging lens for a sub-camera, an imaging lens having a one-piece structure is mainly used because low pixels of VGA or less are common so far, but recently, with the increase in the number of pixels of a sub-camera, in addition to the reduction in thickness (full-length) and the increase in performance that can be achieved for high pixels such as 130 ten thousand pixels and 200 ten thousand pixels, an imaging lens having a two-piece structure that can achieve higher performance than the one-piece structure has been proposed.
As an imaging lens having a two-piece structure, imaging lenses having positive and negative structures as disclosed in patent documents 1 to 4 are known.
Patent document 1: international publication No. 2006/35990 handbook
Patent document 2: japanese patent laid-open publication No. 2011-28213
Patent document 3: japanese patent laid-open publication No. 2010-113124
Patent document 4: japanese patent laid-open publication No. 2011-145491
However, the imaging lens described in patent document 1 has the following problems: the curvature of the image side surface of the second lens is large, and the amount of recess to the inflection point is large, so that the formability is deteriorated. In particular, in a lens made of a hard material such as a glass molded lens, if moldability is deteriorated, variation in the shape of the lens surface during molding is increased, and it is difficult to ensure sufficient optical performance.
The imaging lens described in patent document 2 has the following problems: since the curvature of the image side surface of the second lens is small, the aberration correction is insufficient, and the curvature of the object side surface of the second lens is increased to compensate for the insufficient aberration correction, which results in an increase in the angle of view within the effective diameter and a deterioration in formability.
Further, the imaging lens described in patent document 3 has the following problems: although the imaging lens is formed with consideration for moldability, the curvature of the image side surface of the first lens is small and Petzval (Petzval) and large, so that correction of field curvature is insufficient, and when the total length of the lens is shortened, performance deterioration is caused, and it is difficult to cope with high pixelation of the imaging element.
The imaging lens described in patent document 4 has a problem of poor formability due to an excessively large curvature on the object side of the second lens.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object thereof is to provide an imaging lens having a two-piece structure in which aberrations are corrected, which has better moldability than conventional imaging lenses, and an imaging device using the imaging lens.
Here, although the imaging lens is small, the present invention aims to achieve a reduction in size at a level satisfying the following expression. By satisfying this range, the entire imaging device can be reduced in size and thickness.
L/2Y<1.00 （7）
Wherein,
l: distance on optical axis from lens surface closest to object side to image side focus of whole system of image pickup lens
2Y: the imaging surface diagonal length of the solid-state imaging element (diagonal length of the rectangular effective pixel region of the solid-state imaging element).
Here, the image side focal point refers to an image point when a parallel light ray parallel to the optical axis enters the imaging lens. When a parallel flat plate such as an optical low-pass filter, an infrared cut filter, or a seal glass of a solid-state imaging device package is disposed between the image-side-most surface of the imaging lens and the image-side focal position, the value of L is calculated by setting the parallel flat plate portion to an air-converted distance. In addition, the range of the following formula is more preferable.
L/2Y<0.90 （7）'
The imaging lens according to claim 1, which comprises, in order from an object side, an aperture stop, a first lens and a second lens,
the first lens is a positive meniscus lens having a convex surface on the object side and a concave surface on the image side,
the second lens element is a negative lens element having a paraxial concave surface facing an image side surface, the image side surface having an aspherical surface having an inflection point and a convex shape at its periphery,
the imaging lens is characterized by satisfying the following conditional expression:
﹣1.10<（1﹣n1）f/r2<﹣0.20 （1）
﹣0.18<（n2﹣1）f/r3<0.18 （2）
﹣0.25<（1﹣n2）f/r4<﹣0.02 （3）
wherein,
n 1: refractive index of the first lens relative to d line
n 2: refractive index of the second lens with respect to d-line
r 2: radius of curvature (mm) of the image side surface of the first lens element
r 3: radius of curvature (mm) of the side surface of the second lens body
r 4: radius of curvature (mm) of the image side surface of the second lens element
f: focal length (mm) of the whole system.
The configuration in which the first lens is a positive lens and the second lens is a negative lens is a so-called telephoto type, and thus the total optical length can be shortened. Further, by forming the first lens into a meniscus lens with the convex surface facing the object side, the principal point position of the first lens having a large power can be positioned on the object side, and thus the total optical length can be further shortened. In addition, although the exit pupil position is generally close to the image plane when the total optical length is shortened, and thus the telecentricity is ensured, by positioning the aperture stop closest to the object side and the exit pupil position closer to the object side, and by setting the image side surface of the second lens to an aspherical surface having an inflection point and a convex shape at its periphery (that is, the peripheral portion has positive power), the incident angle of light rays to the peripheral portion of the screen can be reduced, and good telecentricity can be ensured.
When the value of conditional expression (1) is lower than the upper limit, the power can be applied to the concave surface of the image-side surface of the first lens, and therefore the petzval sum can be reduced, and the field curvature can be corrected favorably. In addition, by making the value of conditional expression (1) higher than the lower limit, generation of high-order aberration caused by the concave surface becoming excessively strong can be prevented. The imaging lens of the present invention preferably satisfies the following conditional expression (1').
﹣0.90<（1﹣n1）f/r2<﹣0.30 （1'）
When the value of conditional expression (2) is lower than the upper limit or higher than the lower limit, the curvature of the object side surface of the second lens decreases, and therefore the angle of view of the optical surface is narrowed, and the moldability is good. The imaging lens of the present invention preferably satisfies the following conditional expression (2').
﹣0.15<（n2﹣1）f/r3<0.15 （2'）
When the value of conditional expression (3) is lower than the upper limit, the power of the image side surface of the second lens is increased, and therefore the petzval sum is reduced, and the field curvature can be corrected favorably. Further, since the concave surface of the image side surface of the second lens is weakened by setting the value of conditional expression (3) higher than the lower limit, the amount of sag until the inflection point of the peripheral positive power can be suppressed to be small, and good moldability can be ensured. The imaging lens of the present invention preferably satisfies the following conditional expression (3').
﹣0.20<（1﹣n2）f/r4<﹣0.05 （3'）
The imaging lens according to claim 2 is characterized in that the invention according to claim 1 satisfies the following conditional expression.
﹣10.0<（SAG3/f）×1000<0 （4）
Wherein,
SAG 3: the amount of recess at the seventh position of the effective diameter of the second lens object side surface
By suppressing the amount of recess of the second lens object side surface to be small so as to satisfy expression (4), the optical surface can be made gentle, and therefore, the moldability can be favorably ensured. Here, the "effective diameter" refers to a position through which the outermost light ray of the light ray imaged as the highest image height passes.
The imaging lens according to claim 3 is characterized in that, in addition to the invention according to claim 1 or 2, the second lens has an infrared cut coating layer on an object side surface thereof.
By providing the optical surface with the infrared cut function, it is possible to omit other components having the infrared cut function such as an infrared cut filter, and thus it is possible to reduce the cost. It is known that when an optical surface is coated with an infrared cut coating, a difference in film thickness is generated between the central portion and the peripheral portion of the lens because the lens is provided with a curvature. In particular, since the surface angle of the surface satisfying the expressions (2) and (4) is suppressed to be small, the change in film thickness occurring when the infrared cut coating is used as an optical surface can be suppressed to be small, and the shift of the wavelength characteristic of the coating to the short wavelength side can be suppressed to be minimum.
The imaging lens according to claim 4 is characterized in that the invention according to any one of claims 1 to 3 satisfies the following conditional expression.
0.30<d3/f<0.60 （5）
Wherein,
d 3: on-axis thickness (mm) of the second lens
When the value of conditional expression (5) is less than the upper limit, the thickness of the second lens is not excessively thick, and the total optical length can be shortened. Further, by setting the value of conditional expression (5) higher than the lower limit, the thickness of the second lens is not excessively thin, and even if the peripheral portion of the image-side surface has a concavity toward the object side, the edge thickness can be secured, so that the moldability can be secured satisfactorily. The imaging lens of the present invention preferably satisfies the following conditional expression (5').
0.35<d3/f<0.50 （5'）
The imaging lens according to claim 5 is characterized in that the invention according to any one of claims 1 to 4 satisfies the following conditional expression.
﹣20.0<f2/f1<﹣5.0 （6）
Wherein,
f 1: focal length (mm) of the first lens
f 2: a focal length (mm) of the second lens.
The conditional expression (6) is a conditional expression indicating a power ratio of the first lens to the second lens. When the value of conditional expression (6) is lower than the upper limit, the power of the first lens is sufficiently higher than the power of the second lens, and the total optical length can be suppressed to be small. Further, when the value of conditional expression (6) is higher than the lower limit, the second lens has a certain power with respect to the first lens, and the petzval sum can be reduced, so that the field curvature can be corrected favorably. In addition, since the principal point of the entire system can be located closer to the object side, the total optical length can be further shortened.
The imaging lens of the present invention preferably satisfies the following conditional expression (6').
﹣17.0<f2/f1<﹣8.0 （6'）
The imaging lens according to claim 6 is characterized in that, in the invention according to any one of claims 1 to 5, the second lens is made of glass. The second lens satisfying the formulas (2) and (3) is easy to process a mold and has excellent moldability when glass is used as a raw material. In addition, in the case of a lens made of a hard material such as a glass molded lens, if moldability is deteriorated, variation in the shape of the lens surface during molding is increased, and it is difficult to ensure sufficient optical performance.
The imaging lens according to claim 7 is characterized in that, in the invention according to any one of claims 1 to 5, the second lens is made of resin. The second lens satisfying the expressions (2) and (3) can ensure a highly accurate surface shape even if it shrinks during molding.
The imaging device according to claim 8 is characterized by comprising the imaging lens according to any one of claims 1 to 7 and a solid-state imaging element, and satisfying the following expression.
L/2Y<1.00 （7）
Wherein,
l: a distance on an optical axis from a lens surface closest to an object side to an image side focus of the entire imaging lens system
2Y: the imaging surface diagonal length of the solid-state imaging device (the diagonal length of the rectangular effective pixel region of the solid-state imaging device).
The imaging device according to claim 9 is characterized in that the invention according to claim 8 satisfies the following expression.
L/2Y<0.90 （7'）
According to the present invention, it is possible to provide an imaging lens having a two-piece structure in which various aberrations are corrected, and which has better moldability than conventional imaging lenses, and an imaging device using the imaging lens.
Drawings
Fig. 1 is a perspective view of the imaging device LU according to the present embodiment.
Fig. 2 is a cross-sectional view of the structure of fig. 1, taken along the line of arrows ii-ii and viewed in the direction of the arrows.
Fig. 3 is a diagram showing the mobile phone T, fig. 3 (a) is a diagram showing the folded mobile phone when it is unfolded and viewed from the inside, and fig. 3 (b) is a diagram showing the folded mobile phone when it is unfolded and viewed from the outside.
Fig. 4 is a sectional view of an imaging lens according to embodiment 1.
Fig. 5 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to example 1.
Fig. 6 is a sectional view of an imaging lens according to embodiment 2.
Fig. 7 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to example 2.
Fig. 8 is a sectional view of an imaging lens according to embodiment 3.
Fig. 9 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to example 3.
Fig. 10 is a sectional view of an imaging lens according to embodiment 4.
Fig. 11 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to example 4.
Fig. 12 is a sectional view of an imaging lens according to embodiment 5.
Fig. 13 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to example 5.
Fig. 14 is a sectional view of an imaging lens according to embodiment 6.
Fig. 15 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to example 6.
Fig. 16 is a sectional view of an imaging lens according to embodiment 7.
Fig. 17 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to example 7.
Description of the symbols:
b … operating keys; d1 and D2 … display screens; f … infrared cut filter; an L1 … first lens; an L2 … second lens; an L3 … third lens; LN … imaging lens; LU … camera; a CG … glass cover; s … aperture stop; an IM … image sensor; an IMa … photoelectric conversion portion; t … mobile phone.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of an imaging device LU according to the present embodiment, and fig. 2 is a cross-sectional view of the structure of fig. 1 taken along the line of arrows ii-ii and viewed in the direction of the arrows. As shown in fig. 2, the imaging device LU includes: a CMOS image sensor IM as a solid-state image sensor having a photoelectric conversion portion IMa; an image pickup lens LN for causing the image sensor IM to pick up an image of a subject; and an external connection terminal (electrode), not shown, for transmitting and receiving an electric signal thereof, which are integrally formed.
The imaging lens LN is composed of a first lens L1 made of glass or resin and a second lens L2 made of glass or resin in this order from the object side (upper side in fig. 2). When a lens is made of glass, the lens can be formed by glass molding or a droplet method. The first lens L1 is a positive meniscus lens having a convex surface on the object side and a concave surface on the image side, and the second lens L2 is a negative lens having a paraxial concave surface directed to the image side surface, and the image side surface has an aspherical surface having an inflection point and a convex shape on the periphery, and satisfies the following conditional expressions.
-1.1O＜(l-n1)f/r2＜-0.20 (1)
-0.18＜(n2-1)f/r3＜0.18 (2)
-0.25＜(1-n2)f/r4＜-0.05 (3)
Wherein,
n 1: refractive index of the first lens L1 for d-line
n 2: refractive index of the second lens L2 for d-line
r 2: radius of curvature (mm) of image side surface of first lens
r 3: radius of curvature (mm) of the second lens object side
r 4: radius of curvature (mm) of image side surface of second lens
f: focal distance of the entire system (mm)
A photoelectric conversion portion IMa as a light receiving portion in which pixels (photoelectric conversion elements) are two-dimensionally arranged is formed in a central portion of a plane on the light receiving side of the image sensor IM, and the image sensor IM is connected to a signal processing circuit (not shown). The signal processing circuit includes a driving circuit unit for sequentially driving the pixels to obtain signal charges, an a/D conversion unit for converting the signal charges into digital signals, and a signal processing unit for forming image signals and outputting the image signals using the digital signals. Further, a plurality of pads (not shown) are disposed near the outer edge of the light-receiving side plane of the image sensor IM, and the plurality of pads are connected to the image sensor IM via unillustrated electric wires. The image sensor IM converts the signal charge from the photoelectric conversion unit IMa into an image signal such as a digital YUV signal, and outputs the image signal to a predetermined circuit via an electric wire (not shown). Here, Y is a luminance signal, U (= R-Y) is a color difference signal of red and luminance signals, and V (= B-Y) is a color difference signal of blue and luminance signals. The solid-state imaging element is not limited to the CMOS type image sensor, and other types such as CCD may be used.
The image sensor IM is connected to an external circuit (for example, a control circuit included in a host device of a portable terminal on which the image pickup device is mounted) via an external connection terminal, and can receive a voltage and a clock signal for driving the image sensor IM from the external circuit and output a digital YUV signal to the external circuit.
The upper portion of the image sensor IM is sealed by a glass cap CG. An infrared cut filter F in a parallel flat plate shape is provided above the glass cover CG (on the object side) via a spacer SP3, a flange portion (outside of the lens portion) of the second lens L2 is fixed above the infrared cut filter F at a predetermined distance via a spacer SP2, and a flange portion (outside of the lens portion) of the first lens L1 is fixed above the second lens L2 via a spacer SP 1.
The outside of the lenses L1 and L2 is covered by the casing BX, the lower surface of the upper flange BXa of the casing BX is supported in contact with the upper surface of the flange of the first lens L1 (outside of the lens portion), and the lower end of the casing BX is supported in contact with the glass cover CG. The aperture formed in the upper flange BXa of the housing BX constitutes the diaphragm S.
Next, a mobile phone as an example of a mobile terminal provided with an imaging device will be described based on an external view of fig. 3. Fig. 3 (a) is a view of the folded mobile phone as viewed from the inside, and fig. 3 (b) is a view of the folded mobile phone as viewed from the outside.
In fig. 3 (a) and 3 (B), the upper casing 71 as a housing provided with display screens D1 and D2 and the lower casing 72 provided with operation keys B of the mobile phone T are connected via a hinge 73. In the present embodiment, the main imaging device MC for taking a picture of a landscape or the like is provided on the front surface side of the upper casing 71, and the imaging device LU including the wide-angle imaging lens LN is provided on the rear surface side of the upper casing 71 and above the display screen D1.
The imaging lens LN can image, by the imaging device LU, the upper body of the user himself who holds the mobile phone by hand in a state of facing the imaging device LU as shown in fig. 3. The image signal can be transmitted to a mobile phone of a communication destination, the image of the user can be displayed, and a normal call can be made, thereby realizing a so-called video phone. Note that the mobile phone T is not limited to a folder type.
(examples)
Next, preferred examples of the above-described embodiments will be described. The present invention is not limited to the following examples. The meanings of the symbols of the examples are as follows.
FL: focal length of whole camera lens (mm)
BF: back focal length (mm) (distance from the final optical surface to the paraxial image surface after removing the parallel plate when the parallel plate is set to the air-converted length)
Fno: number F
w: half angle of view (°)
Ymax: length (mm) of half of the diagonal line length of the imaging surface of the solid-state imaging element
TL: the distance (mm) on the optical axis from the lens surface closest to the object side to the image side focus of the entire image pickup lens (wherein the "image side focus" means an image point obtained by setting the parallel flat plate to an air conversion length when parallel rays parallel to the optical axis are incident on the image pickup lens)
r: radius of curvature (mm) of the refracting surface
d: axial surface spacing (mm)
nd: refractive index of lens material at normal temperature of d-line
vd: abbe number of lens material
STO: aperture diaphragm
In each embodiment, a surface denoted by "", after each surface number, is a surface having an aspherical shape, and the aspherical shape is represented by the following "expression 1" with the vertex of the surface being the origin, the X axis being taken in the optical axis direction, and the height in the direction perpendicular to the optical axis being h.
[ formula 1]
Wherein,
ai: aspheric coefficient of order i
R: reference radius of curvature
K: a conic constant.
In addition, in the following (including lens data of the table), an index (e.g., 2.5x 10) of 10 is represented by E (e.g., 2.5E-002)－02). The object side of the first lens is a first surface, and the surface numbers of the lens data are sequentially assigned thereto. In the examples, the units of the numerical values indicating the lengths are all mm.
(example 1)
Table 1 shows lens data of example 1. Fig. 4 is a sectional view of the lens of example 1. The imaging lens according to embodiment 1 includes, in order from the object side, an aperture stop S, a first lens L1, and a second lens L2, the first lens L1 being a positive meniscus lens having a convex surface on the object side and a concave surface on the image side, and the second lens L2 being a negative lens having a paraxial concave surface facing the image side surface, the image side surface having an aspherical surface having an inflection point and a convex shape on the periphery. F is an infrared cut filter, CG is a glass cover, and IM is a solid-state image pickup element.
[ Table 1]
Reference wavelength 587.56nm
Unit: mm is
Coefficient of aspheric surface
3：K＝-4.42830e+000，A3＝1.95700e-002，A4＝9.65840e-001，A6＝-8.98080e-001，A8＝-2.17300e+001，A10＝3.89000e+002，A12＝-2.98010e+003，A14＝1.12680e+004，A16＝-1.69290e+004
4：K＝-5.00000e+001，A3＝4.60780e-001，A4＝-4.30670e-001，A6＝9.84810e+000，A8＝－１.02650e+002，A10＝8.50080e+002，A1２＝-4.59480e+003，A14＝1.43470e+004，A16＝-1.87400e+004
5：Ｋ＝０.00000e+000，A4＝-4.74040e-001，A6＝1.18080e+000，A8＝-1.32070e+001，A10＝5.38720e+001，A12＝-9.71240e+001，A14＝1.83010e+002，A16＝-1.01490e+003，A18＝２.50480e+003，A20＝-1.91630e+003
6：K＝0.00000e+000，A4＝-9.02160e-002，A6＝-1.31520e-001，A8＝２.57910e-001，A10＝-3.88240e-001，A12＝2.37370e-001，A14＝6.04190e-002，A16＝-1.63310e-001，A18＝7.72210e-002，A20＝-1.18490e-002
Fig. 5 is an aberration diagram (spherical aberration (a), astigmatism (b), and distortion (c)) of example 1. Here, in the spherical aberration diagram, the solid line represents the amount of spherical aberration with respect to the d-line, the broken line represents the amount of spherical aberration with respect to the g-line, and in the astigmatism diagram, the solid line represents the sagittal surface (sagittal surface) and the broken line represents the meridional surface (meridional surface) (the same applies hereinafter).
(example 2)
Table 2 shows lens data of example 2. Fig. 6 is a sectional view of the lens of example 2. The imaging lens according to embodiment 2 includes, in order from the object side, an aperture stop S, a first lens L1, and a second lens L2, the first lens L1 being a positive meniscus lens having a convex surface on the object side and a concave surface on the image side, and the second lens L2 being a negative lens having a paraxial concave surface facing the image side surface, the image side surface having an aspherical surface having an inflection point and a convex shape on the periphery. Further, F denotes an infrared cut filter, CG denotes a glass cover, and lM denotes a solid-state image pickup element.
[ Table 2]
Reference wavelength 587.56nm
Unit: mm is
Coefficient of aspheric surface
3：K＝-4.40583e+000，A3＝-3.52063e-003，A4＝8.87648e-001，A6＝-1.37562e+000，A8＝-2.11593e+001，A10＝4.25059e+002，A12＝-3.19571e+003，A14＝1.12751e+004，A16＝-1.53899e+004
4：K＝-5.00000e+001，A3＝3.97337e-001，A4＝-4.98522e-001，A6＝1.03872e+001，A8＝-1.15793e+002，A10＝9.34071e+002，A12＝-4.60672e+003，A14＝１.23904e+004，A16＝-1.36840e+004
5：K＝0.00000e+000，A4＝-5.09306e-001，A6＝1.86433e+000，A8＝-1.36358e+001，A10＝4.81356e+001，A12＝-1.00943e+002，A14＝2.40224e+002，A16＝-7.55447e+002，A18＝1.34373e+003，A20＝-8.85488e+002
6：K＝０.00000e+000，A4＝-1.12968e-001，A6＝-1.26251e-001，A8＝2.82773e-001，A10-3.93303e-001，A12＝2.24028e-001，A1４＝5.85290e-002，A16＝-1.58629e-001，A18＝8.29624e-002，A20＝-1.52528e-002
Fig. 7 is an aberration diagram (spherical aberration (a), astigmatism (b), and distortion (c)) of example 2.
(example 3)
Table 3 shows lens data of example 3. Fig. 8 is a sectional view of the lens of example 3. The imaging lens according to embodiment 3 is composed of, in order from the object side, an aperture stop S, a first lens L1, and a second lens L2, wherein the first lens L1 is a positive meniscus lens having a convex surface on the object side and a concave surface on the image side, and the second lens L2 is a negative lens having a paraxial concave surface facing the image side surface, and the image side surface has an aspherical surface having an inflection point and a convex shape on the periphery. Further, F denotes an infrared cut filter, CG denotes a glass cover, and lM denotes a solid-state image pickup element.
[ Table 3]
Reference wavelength 587.56nm
Unit: mm is
Coefficient of aspheric surface
3：K＝-6.01260e+000，A3＝3.75767e-002，A4＝9.55063e-001，A6＝-1.88262e+000，A8＝-2.24516e+001，A10＝4.54566e+002，A12＝－3.18006e+003，A14＝9.91073e+003，A16＝-1.11738e+004
4：K＝1.26415e+001，A3＝4.22193e-001，A4＝-1.62799e+000，A6＝1.29438e+001，A8＝-1.15022e+002，A10＝9.16295e+002，A12＝-4.67268e+003，A14＝1.25006e+004，A16＝-1.30901e+004
5：K＝0.00000e+000，A4＝-2.82274e-001，A6＝9.87052e-001，A8＝-1.21176e+001，A10＝5.00541e+001，A12＝-1.02408e+002，A14＝2.13102e+002，A16＝-8.12319e+002，A18＝1.77837e+003，A20＝-1.38317e+003
6：K＝0.00000e+000，A4＝-5.42322e-002，A6＝-1.62605e-001，A8＝3.10050e-001，A10＝-3.83069e-001，A12＝2.15983e-001，A14＝5.90651e-002，A16＝-1.58014e-001，A18＝8.26739e-002，A20＝-1.46841e-002
Fig. 9 is an aberration diagram (spherical aberration (a), astigmatism (b), and distortion (c)) of example 3.
(example 4)
Table 4 shows lens data of example 4. Fig. 10 is a sectional view of the lens of example 4. The imaging lens according to embodiment 4 includes, in order from the object side, an aperture stop S, a first lens L1, and a second lens L2, the first lens L1 being a positive meniscus lens having a convex surface on the object side and a concave surface on the image side, and the second lens L2 being a negative lens having a paraxial concave surface facing the image side surface, the image side surface having an aspherical surface having an inflection point and a convex shape on the periphery. Further, F denotes an infrared cut filter, CG denotes a glass cover, and lM denotes a solid-state image pickup element.
[ Table 4]
Reference wavelength 587.56nm
Unit: mm is
Coefficient of aspheric surface
3：K＝-3.15541e+000，A3＝-3.56669e-002，A4＝9.24268e-001，A6＝-1.05369e-001，A８＝-3.30585e+001，A1０＝4.60558e+002，A1２＝-3.00381e+00+，A14＝９.82347e+003，A16＝-1.28446e+004
4：K＝6.90028e+000，A3＝２.93943e-001，A4＝-1.57193e+000，A6＝1.67272e+001，A8＝-1.44248e+002，A10＝8.94175e+002，A1２＝-4.18454e+003，A14＝1.34391e+004，A14＝-2.09593e+004
5：K＝0.00000e+000，A4＝-5.35224e-001，A6＝１.53473e+000，A8＝-1.18000e+001，A10＝4.37271e+001，A1２＝-1.05196e+002，A14＝3.34103e+002，A16＝-1.20857e+003，A18＝2.26001e+003，A20＝-1.52940e+003
6：K＝0.00000e+0000，A4＝-1.27106e-001，A6＝-1.02122e-001，A8＝2.51530e-001，A10＝-3.87909e-001，A12＝2.31039e-001，A14＝6.36030e-002，A16＝-1.65851e-001，A18＝8.24530e-002，A20＝-1.40219e-002
Fig. 11 is an aberration diagram (spherical aberration (a), astigmatism (b), distortion (c)) of example 4.
(example 5)
Table 5 shows lens data of example 5. Fig. 12 is a sectional view of the lens of example 5. The imaging lens according to embodiment 5 includes, in order from the object side, an aperture stop S, a first lens L1, and a second lens L2, the first lens L1 being a positive meniscus lens having a convex surface on the object side and a concave surface on the image side, and the second lens L2 being a negative lens having a paraxial concave surface facing the image side surface, the image side surface having an aspherical surface having an inflection point and a convex shape on the periphery. CG is a glass cover, and lM is a solid-state imaging element. In the present embodiment, an infrared cut coating is applied to the object side surface of the second lens L2.
[ Table 5]
Reference wavelength 587.56nm
Unit: mm is
Coefficient of aspheric surface
3：K＝-8.16625e+000，A3＝3.18129e-002，A4＝9.89771e-001，A6＝-5.88553e-001，A8＝-3.76841e+001，A10＝4.99253e+002，Al2＝-3.04725e+003，A14＝９.22448e+003，A16＝-1.10219e+004
4：K＝4.33221e+000，A3＝3.63077e-001，A4＝-1.67171e+000，A6＝１.58862e+001，A8＝-1.35829e+002，A10＝9.18381e+002，A12＝－4.32723e+003，A14＝１.19693e+004，A16＝-1.38134e+004
5：K＝0.00000e+000，A4＝-4.49680e-001，A6＝9.33256e-001，A8＝-7.59496e+000，A10＝3.81113e+001，A12＝-1.56340e+002，A14＝4.54470e+002，A16＝-7.88247e+002，A18＝5.54498e+002，A20＝-2，58002e+001
6：K＝0.00000e+000，A4＝-8.15697e-002，A6＝-7.84948e-002，A8＝２.35133e-001，A10＝-3.93798e-001，A12＝２.37718e-001，A14＝7.46519e-002，A16＝-1.71513e-001，A18＝8.12837e-002，A20＝-1.30862e-002
Fig. 13 is an aberration diagram (spherical aberration (a), astigmatism (b), and distortion (c)) of example 5.
(example 6)
Table 6 shows lens data of example 6. Fig. 14 is a sectional view of the lens of example 6. The imaging lens according to embodiment 6 is composed of, in order from the object side, an aperture stop S, a first lens L1, and a second lens L2, wherein the first lens L1 is a positive meniscus lens having a convex surface on the object side and a concave surface on the image side, and the second lens L2 is a negative lens having a paraxial concave surface facing the image side surface, and the image side surface has an aspherical surface having an inflection point and a convex shape on the periphery. Further, F denotes an infrared cut filter, CG denotes a glass cover, and lM denotes a solid-state image pickup element.
[ Table 6]
Reference wavelength 587.56nm
Unit: mm is
Coefficient of aspheric surface
3：K＝-2.47242e+000，A3＝-2.03904e-002，A4＝5.28641e-001，A5＝2.54642e+000，A６＝-8.21916e+000，A8＝3.04775e+001，A10＝-4.41460e+001，A1２＝-2.28918e+002，A14＝8.29246e+002，A16=-3.23533e+002
4：K＝-3.43564e-001，A3＝1.96346e-002，A4＝２.34363e-001，A5＝1.90841e+000，A6＝-6.24281e+000，A8＝4.77867e+001，A10＝-1.42714e+002，A12＝-1.22119e+003，A14＝１.24465e+004，A16＝-2.93322e+004
5：K＝0.00000e+000，A3＝1.63283e-001，A4＝-7.76179e-001，A6＝-3.60913e-001，A8＝6.84326e+000，A10＝-4.15614e+001，A1２＝8.54161e+001，A14＝-1.47110e+001，A1６＝-1.74300e+002
6：K＝0.00000e+000，A４＝7.94924e-002，A６＝-7.06609e-001，A8＝9.79988e-001，A10＝－3.12305e-001，A1２＝-6.37242e-001，A14＝５.03041e-001，A16＝１.24628e-001，A18＝-2.27376e-001，A20＝5.74678e-002
Fig. 15 is an aberration diagram (spherical aberration (a), astigmatism (b), and distortion (c)) of example 6.
(example 7)
Table 7 shows lens data of example 7. Fig. 16 is a sectional view of the lens of example 7. The imaging lens according to embodiment 7 includes, in order from the object side, an aperture stop S, a first lens L1, and a second lens L2, the first lens L1 being a positive meniscus lens having a convex surface on the object side and a concave surface on the image side, and the second lens L2 being a negative lens having a paraxial concave surface facing the image side surface, the image side surface having an aspherical surface having an inflection point and a convex shape on the periphery. Further, F denotes an infrared cut filter, CG denotes a glass cover, and lM denotes a solid-state image pickup element.
[ Table 7]
Reference wavelength 587.56nm
Unit: mm is
Coefficient of aspheric surface
3：K＝-7.95071e+000，A3＝2.35363e-002，A4＝9.82407e-001，A6＝-2.35928e+000，A8＝-2.33433e+001，A10＝4.65419e+002，A１２＝-3.19416e+003，A14＝1.01163e+004，A16＝-1.22571e+004
4：K＝1.10170e+001，A3＝3.78654e-001，A4＝-1.54800e+000，A6＝１.26252e+001，A8＝-1.18094e+002，A10＝9.22635e+002，A12＝-4.63530e+003，A14＝１.24582e+004，A16＝-1.34381e+004
5：K＝0.00000e+000，A4＝-2.59479e-001，A6＝8.63308e-001，A8＝-1.18218e+001，A10＝5.00452e+001，A12＝-1.03338e+002，A14＝2.11221e+002，A16＝-7.81989e+002，A18＝1.72624e+003，A20＝-1.38433e+003
6：K＝0.00000e+000，A4＝-3.32183e-002，A6＝-1.98003e-001，A8＝3.20956e-001，A10＝-3.80584e-001，A12＝2.13360e-001，A14＝5.92626e-002，A16＝-1.57226e-001，A18＝8.27200e-002，A20＝-1.50977e-002
Fig. 17 is an aberration diagram (spherical aberration (a), astigmatism (b), and distortion (c)) of example 7.
Table 8 shows the values of the examples corresponding to the respective conditional expressions in a comprehensive manner.
[ Table 8]
The present invention is not limited to the embodiments described in the specification, and it is obvious to those skilled in the art that the present invention includes other embodiments and modifications based on the embodiments and technical ideas described in the specification. The description and examples are intended for purposes of illustration only and the scope of the present invention is indicated by the claims.
Claims (8)
1. An imaging lens comprising, in order from an object side, an aperture stop, a first lens and a second lens,
the first lens is a positive meniscus lens having a convex surface on the object side and a concave surface on the image side,
the second lens element is a negative lens element having a paraxial concave surface facing an image side surface, the image side surface having an aspherical surface having an inflection point and a convex shape at the periphery thereof,
the imaging lens is characterized by satisfying the following conditional expression:
﹣1.10<(1﹣n1)f/r2<﹣0.20 (1)
﹣0.18<(n2﹣1)f/r3<0.18 (2)
﹣0.25<(1﹣n2)f/r4<﹣0.02 (3)
﹣10.0<(SAG3/f)×1000<0 (4)
wherein,
n 1: a refractive index of the first lens with respect to a d-line
n 2: refractive index of the second lens relative to d-line
r 2: radius of curvature (mm) of the image side surface of the first lens
r 3: radius of curvature (mm) of the second lens object side surface
r 4: radius of curvature (mm) of the image side surface of the second lens
f: focal length of the whole system (mm)
SAG 3: a depression amount at a seventh position of an effective diameter of the second lens object side.
2. The imaging lens according to claim 1,
the second lens has an infrared cut coating on an object side.
3. The imaging lens according to claim 1,
the following conditional expressions are satisfied:
0.30<d3/f<0.60 (5)
wherein,
d 3: an on-axis thickness (mm) of the second lens.
4. The imaging lens according to claim 1,
the following conditional expressions are satisfied:
﹣20.0<f2/f1<﹣5.0 (6)
wherein,
f 1: focal length (mm) of the first lens
f 2: a focal length (mm) of the second lens.
5. The imaging lens according to claim 1,
the second lens is made of glass.
6. The imaging lens according to claim 1,
the second lens is made of resin.
7. An image pickup apparatus is characterized in that,
the imaging lens according to any one of claims 1 to 6, and a solid-state imaging element, and satisfying the following expression:
L/2Y<1.00 (7)
wherein,
l: a distance on an optical axis from a lens surface closest to an object side to an image side focus of the entire imaging lens system
2Y: an imaging face diagonal length of the solid-state imaging element (a diagonal length of a rectangular effective pixel region of the solid-state imaging element).
8. The image pickup apparatus according to claim 7,
satisfies the following equation:
L/2Y<0.90 (7')。
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| JP2009251516A (en) * | 2008-04-10 | 2009-10-29 | Komatsulite Mfg Co Ltd | Imaging lens |
| US20100053778A1 (en) * | 2008-09-04 | 2010-03-04 | Enplas Corporation | Imaging lens |
| CN101937125A (en) * | 2009-06-26 | 2011-01-05 | 柯尼卡美能达精密光学株式会社 | Image pickup lens, image pickup device, and mobile terminal device |
| CN102129116A (en) * | 2010-01-14 | 2011-07-20 | 夏普株式会社 | Image pickup lens, image pickup module, and portable information device |
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| JP2009098492A (en) * | 2007-10-18 | 2009-05-07 | Konica Minolta Opto Inc | Imaging lens, imaging apparatus, and digital device |
| JP2011248319A (en) * | 2010-04-28 | 2011-12-08 | Sharp Corp | Imaging lens and imaging module |
| CN102236155A (en) * | 2010-04-28 | 2011-11-09 | 夏普株式会社 | Cameral lens and camera module |
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| US20100053778A1 (en) * | 2008-09-04 | 2010-03-04 | Enplas Corporation | Imaging lens |
| CN101937125A (en) * | 2009-06-26 | 2011-01-05 | 柯尼卡美能达精密光学株式会社 | Image pickup lens, image pickup device, and mobile terminal device |
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