CN108885330A - Imaging lens system, lens unit and photographic device - Google Patents
Imaging lens system, lens unit and photographic device Download PDFInfo
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- CN108885330A CN108885330A CN201780019586.8A CN201780019586A CN108885330A CN 108885330 A CN108885330 A CN 108885330A CN 201780019586 A CN201780019586 A CN 201780019586A CN 108885330 A CN108885330 A CN 108885330A
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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
- G02B13/04—Reversed telephoto objectives
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The present invention provides, and there is long back focal length, wide field angle to be ensured that, be bigbore while focusing deviation small cheap imaging lens system when having good optical property and environmental change.Imaging lens system (10) is successively substantially comprised from object side：1st lens (L1), are formed by glass, have negative focal power, have concave shape in image side surface；2nd lens (L2), are formed by glass, have positive focal power；3rd lens (L3), are formed by plastics, have negative focal power, have at least one aspherical shape；4th lens (L4), it is formed by plastics, with positive focal power, there is at least one aspherical shape, meet conditional (1) related with value f12/f, conditional related with value f3/f4 (2) and conditional related with value D34/f (3).
Description
Technical field
The present invention relates to the imaging lens system for the wide-angle type being substantially made of 4 lens and has the imaging lens system
Lens unit and photographic device.
Background technique
In recent years, the miniaturization of the photographing elements such as CCD, CMOS, high pixelation are in progress.At the same time, has this
The miniaturization of the image capturing apparatus main body of a little photographing elements is also in progress, saturating for the camera shooting for being equipped on the image capturing apparatus main body
Mirror also requires miniaturization, high performance.In turn, for being equipped on the lens of vehicle-mounted vidicon, surveillance camera etc., it is desirable that ring
Border tolerance is high so that be also able to use under severe environment, also requires cheap and light-duty.As in such field
The fewer imaging lens system of previously known lens number, such as the imaging lens system of patent document 1 and 2 can be enumerated.
Expectation for the lens in above-mentioned field is harsh year by year, it is desirable that while meeting multiple high requests.I.e. it is desired to take the photograph as follows
As lens：While for lens number few and small-sized structure, having can such as match between lens system and photographing element
Cover glass, optical filter back focal length long like that are set, and is heavy caliber so that being also able to use under the low light conditions such as night,
Aberration is also satisfactorily corrected while 60 ° or more of wide-angle is ensured that under full view.In addition to this, as vehicle-mounted pick-up
Machine, surveillance camera etc., the fixed-focus without automatic focusing function it is in the majority, focusing caused by environmental change deviates direct
Resolution ratio performance is influenced, so becoming more to reinforce for the expectation of environment resistance (especially for the characteristic of temperature change)
It is strong.
However, the content documented by above patent document 1 and 2, is the letter being made of 4 lens in whole system
Meet wide-angle while single optical system and heavy caliber and long back focal length ensure, but glass lens is widely used, thus
The research for environment resistance is hardly needed, so being and cheap opposite structure.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2009-14947 bulletin
Patent document 2：Japanese Unexamined Patent Publication 2011-257462 bulletin
Summary of the invention
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide have long back focal length, wide field angle
It is ensured that, deviateing small cheap take the photograph for bigbore while when there is good optical property and environmental change focusing
As lens.
In addition, the purpose of the present invention is to provide the lens units and photographic device that have above-mentioned imaging lens system.
At least one purpose in achieve the goals above reflects the imaging lens system of one aspect of the present invention from object
It rises and successively substantially comprises in side：1st lens, are formed by glass, have negative focal power, have concave shape in image side surface；2nd
Lens are formed by glass, have positive focal power；3rd lens, are formed by plastics, have negative focal power, have at least one
Aspherical shape；And the 4th lens, formed by plastics, there is positive focal power, there is at least one aspherical shape, meet with
Under conditional.
0.8 < f12/f < 1.2 ... (1)
- 1.65 < f3/f4 < -0.8 ... (2)
0≤D34/f < 0.04 ... (3)
Wherein, value f is the focal length of lens whole system, and value f12 is the synthesis focal length of the 1st lens and the 2nd lens, and value f3 is
The focal length of 3rd lens, value f4 are the focal length of the 4th lens, and value D34 is the interval on optical axis of the 3rd lens and the 4th lens.
At least one purpose in achieve the goals above, the lens unit for reflecting one aspect of the present invention have
Above-mentioned imaging lens system and the lens barrel for keeping imaging lens system.
At least one purpose in achieve the goals above, the photographic device for reflecting one aspect of the present invention have
The photographing element of the picture of said lens unit and projection based on the lens unit.
Detailed description of the invention
Fig. 1 is the lens unit and photographic device for the imaging lens system that explanation has an embodiment of the invention
Figure.
Fig. 2A of Fig. 2 is the cross-sectional view of imaging lens system of embodiment 1 etc., and Fig. 2 B~2D is aberration diagram.
Fig. 3 A of Fig. 3 is the cross-sectional view of imaging lens system of embodiment 2 etc., and Fig. 3 B~3D is aberration diagram.
Fig. 4 A of Fig. 4 is the cross-sectional view of imaging lens system of embodiment 3 etc., and Fig. 4 B~4D is aberration diagram.
Fig. 5 A of Fig. 5 is the cross-sectional view of imaging lens system of embodiment 4 etc., and Fig. 5 B~5D is aberration diagram.
Fig. 6 is the enlarged partial sectional view for illustrating the variation of the 3rd and the 4th lens in imaging lens system shown in FIG. 1.
Specific embodiment
Fig. 1 is the cross-sectional view for being shown as the photographic device 100 of an embodiment of the invention.Photographic device 100 has
It is standby：Camara module 30, is used to form picture signal；And processing unit 60, by acting camara module 30, so that playing
Function as photographic device 100.
Camara module 30 has：Lens unit 40, built-in imaging lens system 10；And sensor portion 50, it will be saturating by imaging
The shot object image that mirror 10 is formed is transformed to picture signal.
Lens unit 40 has the imaging lens system 10 as wide-angle optics and is incorporated with the lens barrel 41 of imaging lens system 10.
Imaging lens system 10 is made of the 1st~the 4th lens L1~L4.Lens barrel 41 is mixed by resin, metal, by glass fibre and resin
Material etc. formed, lens etc. are contained in inside and are kept.By metal, the material for mixing glass fibre and resin
In the case where forming lens barrel 41, compared with resin, it is not easy to thermally expand, can steadily fixes imaging lens system 10.Lens barrel 41 has
Make the opening OP of the light incidence from object side.
The full view of imaging lens system 10 is 60 ° or more.The the 1st~the 4th lens L1~L4 of imaging lens system 10 is constituted at them
Flange part or peripheral part, be directly or indirectly held in the inner surface side of lens barrel 41, carry out about the direction optical axis AX
And the positioning in the direction vertical with optical axis AX.In particular, the 4th lens L4 is supported on lens barrel 41 across the 3rd lens L3.It is specific and
Speech, the cricoid fitting projection 10b for being set to the flange part 4b of the 4th lens L4 are embedded in the flange part for being set to the 3rd lens L3
The cricoid chimeric recess portion 10a of 3b and carry out the positioning about the direction optical axis AX and the direction vertical with optical axis AX.Pass through this
Sample is made into the construction for keeping the 3rd lens L3 chimeric with the 4th periphery lens L4, is able to maintain the alignment of two lens L3, L4, so
It is able to suppress lens offset error, it is impinging one another to can be avoided optical surface.
Sensor portion 50 has：Solid-state imager 51 is shot to by 10 formation of imaging lens system (wide-angle optics)
Body image carries out light-to-current inversion；Substrate 52 supports the solid-state imager 51；Sensor holder 53 keeps solid through substrate 52
Photographing element 51.Solid-state imager 51 is, for example, cmos type imaging sensor.Substrate 52 has for keeping solid-state image pickup first
Wiring, the peripheral circuit etc. that part 51 acts.Sensor holder 53 is formed by resin and other materials, not only with respect to optical axis AX
Solid-state imager 51 is positioned, optical filter F1 is also supported in the mode opposed with solid-state imager 51.Lens unit 40
Lens barrel 41 is fixed in the state of being positioned in a manner of being embedded in sensor holder 53.
Solid-state imager (photographing element) 51 has the photoelectric conversion department 51a as imaging surface I, is formed on its periphery
Signal processing circuit (not shown).The pixel that is components of photo-electric conversion are configured with to 2 dimensions in photoelectric conversion department 51a.This
Outside, solid-state imager 51 is not limited to above-mentioned cmos type imaging sensor, other photographing elements such as CCD can also be filled
Enter.
Furthermore it is possible to match between the lens for constituting lens unit 40 or between lens unit 40 and sensor portion 50
Set optical filter etc..In the example in fig 1, optical filter F1 is configured at the 4th lens L4 and solid-state imager 51 of imaging lens system 10
Between.Optical filter F1 is the flat of seal glass for imagining optics low pass filter, IR edge filter, solid-state imager 51 etc.
Row plate.Optical filter F1 can also be configured as independent filter member, but can not separate configurations but composition is taken the photograph
As the arbitrary lens face of lens 10 assigns the function.For example, for cutoff filter, it can also be at 1
Or apply infrared cutoff coating on the surface of multi-disc lens.
Processing unit 60 has element driving portion 61, input unit 62, storage unit 63, display unit 64 and control unit 68.Element
Driving portion 61 is by being output to external circuit (specifically, appended by solid-state imager 51 for YUV and other digital pixel signals
The circuit etc. of band), or from the receiving of control unit 68 for driving the voltage of solid-state imager 51, the supply of clock signal, from
And act solid-state imager 51.Input unit 62 is to accept the part of the operation of user, and storage unit 63 is keeping photographic device
The part of information needed for 100 movement, the image data got by camara module 30 etc., display unit 64 are that display should mention
Show to the part of image obtained from the information of user, photography etc..Control unit 68 can sum up control element driving portion 61, input
The movement of portion 62, storage unit 63 etc., such as various image procossings are carried out to the image data obtained by camara module 30.
Although the specific function of processing unit 60 is loaded into according to this photographic device 100 in addition, omitting detailed description
Equipment purposes and suitably adjust.Photographic device 100 can be equipped on the various uses such as vehicle-mounted vidicon, surveillance camera
Device.
Hereinafter, referring to Fig.1, illustrating imaging lens system (wide-angle optics) 10 of the 1st embodiment etc..In addition, in Fig. 1
The imaging lens system 10 exemplified is 11 same structure of imaging lens system with aftermentioned embodiment 1.
The imaging lens system (wide-angle optics) 10 of diagram is with being followed successively by negative, positive, negative, positive light focus from object side
Spend 4 lens arrangements of configuration.If being concretely demonstrated, imaging lens system 10 is successively substantially comprised from object side：It is negative
The 1st lens L1, positive the 2nd lens L2, the 3rd negative lens L3 and the 4th positive lens.1st and the 2nd lens L1, L2 by
Glass is formed.3rd and the 4th lens L3, L4 is formed by plastics (or resin).About being configured at the position for being exposed to extraneous gas
The 1st lens L1 set is set to glass system to improve tolerance to climate.In turn, vehicle-mounted vidicon is being contemplated, is monitoring and takes the photograph
In the case where use under the severe environment of camera etc., preferably to the side of the object of the 1st lens L1 implement for improve intensity,
Traumatic resistance, the processing of resistance to chemical reagents, reflection prevent from handling.In turn, hydrophobic painting preferably is applied to the side of the object of the 1st lens L1
Layer, hydrophilic coating.1st lens L1 has concave shape in image side surface.2nd lens L2 preferably has two convex forms.3rd and the 4th
Lens L3, L4 are respectively provided at least one aspherical shape.In addition, in the example in the figures, the 1st and the 2nd lens L1, L2's
Side of the object and image side surface have spherical shape, but these lens L1, L2 can also be respectively provided at least one aspherical shape
Shape.In the case where the 1st and the 2nd lens L1, L2 of glass system has aspherical, cost increase, but optical property improves.Such as
It has been described above like that, the 3rd lens L3 is that lens are chimeric each other with the 4th lens L4.The strong aspherical plastic lens of focal power
Eccentric error sensitivity is often got higher.Therefore, do not make two lens L3, L4 all chimeric with lens barrel 41 by being made into, and only make to appoint
Anticipate a side lens it is chimeric with lens barrel 41, the lens of another party and the directly chimeric structure of the lens of other sides itself can press down
Group processed is eccentric (specifically, bias between the 3rd and the 4th lens L3, L4).It can also be by the 3rd and the 4th lens L3, L4
It is made into cemented lens.It in this case, being capable of correcting chromatic aberration better.It is provided between the 1st lens L1 and the 2nd lens L2
Be open diaphragm ST.Imaging lens system 10 is such as flowering structure：On the basis of the diaphragm ST that is open, before the object side for the diaphragm ST that is open is set as
Group Gr1, is set as rear group Gr2 for image side.
Imaging lens system (wide-angle optics) 10 meets conditional below (1)~(3).
0.8 < f12/f < 1.2 ... (1)
- 1.65 < f3/f4 < -0.8 ... (2)
0≤D34/f < 0.04 ... (3)
Wherein, value f is the focal length of lens whole system, and value f12 is the synthesis focal length of the 1st lens L1 and the 2nd lens L2, value
F3 is the focal length of the 3rd lens L3, and value f4 is the focal length of the 4th lens L4, and value D34 is the optical axis AX of the 3rd lens L3 and the 4th lens L4
On interval.
For without automatically focus (AF) fixed-focus optical system in the case where, defocus caused by temperature change
As problem, but meet conditional (1)~(3), to become defocusing using plastic lens and when being not easy to cause temperature change
Structure.Specifically, set in a manner of the range to meet conditional (1) glass lens (specifically, the 1st and
2nd lens L1, L2) synthesis focal length, thus by the 1st lens L1 and the 2nd lens L2 substantially determine optical system focal length, even if
Plastic lens, i.e. the 3rd and the 4th lens L3, L4 are expanded or are reduced because of temperature change, the influence that defocuses associated with it
Become smaller.In turn, as the 3rd lens L3 and the 4th lens L4 of plastic lens for being easy to be influenced by temperature change while meeting
Conditional (2) and (3), so as to which the synthesis focal power of plastic lens is set at essentially 0, so can be made into more not
Easily cause the structure defocused.
In addition, in imaging lens system 10, the material of the 1st~the 4th lens L1~L4 also meet conditional below (4)~
(7)。
70 < vd1 < 100 ... (4)
30 < vd2 < 50 ... (5)
20 < vd3 < 30 ... (6)
50 < vd4 < 60 ... (7)
Wherein, value vd1 is the Abbe number under the d line of the 1st lens L1, and value vd2 is the Abbe number under the d line of the 2nd lens L2,
Value vd3 is the Abbe number under the d line of the 3rd lens L3, and value vd4 is the Abbe number under the d line of the 4th lens L4.
Vehicle-mounted vidicon, surveillance camera use on the way, not only imagine daytime use, it is also contemplated that the use at night,
So not only needing to cope with the camera shooting under visible light, it is also necessary to cope with the camera shooting under near infrared light.Therefore, in the light of fixed-focus
In system, the range correcting chromatic aberration in visible light near infrared light is needed.By using meeting the above conditions (4)~(7)
Range material, can be in the range correcting chromatic aberration of visible light near infrared light.
About the above conditions (4) and (5), it is preferably set as the range of following formula.
75 < vd1 < 85 ... (4) '
35 < vd2 < 45 ... (5) '
In addition, imaging lens system 10 also meets conditional below (8).
- 1.2 < ff/fr < -1.0 ... (8)
Wherein, value ff is the focal length of pre-group Gr1, and value fr is the focal length of rear group Gr2.
By meeting the range of conditional (8), small-sized optical system can be also made into while there is long back focal length
System.By being more than the lower limit of conditional (8), so as to ensure enough back focal length.On the other hand, by being lower than conditional
(8) the upper limit so that back focal length will not be too long, and can be realized the miniaturization of imaging lens system 10.
In addition, imaging lens system 10 also meets conditional below (9).
R2 < | R1 | ... (9)
Wherein, value R1 is the radius of curvature of the side of the object of the 1st lens L1, and value R2 is the song of the image side surface of the 1st lens L1
Rate radius.
By meeting the range of conditional (9), it is able to suppress the generation of spherical aberration, and ensure wide field angle.
In addition, imaging lens system 10 also meets conditional below (10).
1.3 < D12/f < 2.2 ... (10)
Wherein, value f is the focal length of whole system, and value D12 is the interval on the optical axis AX of the 1st lens L1 and the 2nd lens L2.
By being lower than the upper limit of conditional (10), so as to realize the miniaturization of imaging lens system 10.On the other hand, pass through
Spherical aberration can be relatively easily corrected without increasing the focal power of the 1st lens L1 more than the lower limit of conditional (10)
And ratio chromatism,.
About the above conditions (10), it is preferably set as the range of following formula.
1.4 < D12/f < 2.1 ... (10) '
In addition, imaging lens system 10 can also also have substantially without focal power other optical elements (such as lens,
Filter member etc.).
In imaging lens system 10 described above is equal, it is made into and is followed successively by negative, positive, negative, positive focal power from object side and matches
It sets, the 3rd and the 4th lens L3, L4 is made into aspherical plastic lens, be few saturating thus in the optical system of wide-angle
Even aberration can be also satisfactorily corrected in heavy caliber while eyeglass number.In addition, by using multi-disc plastic lens, thus with
The case where being all made of glass lens is compared, and realizes cost effective.
Such imaging lens system 10 can be suitable for the video camera of the not fixed-focus of focusing function.As being used
Specific purposes, can enumerate the safety cameras such as surveillance camera, call gate video camera, certification video camera, marketing camera shooting
The lens of machine are equipped on automobile, the vehicle-mounted vidicon lens of other moving bodys, medical endoscope, health care measurement, work
The medical treatment such as sight glass and Industrial Optics lens etc. in the industry.In addition, imaging lens systems 10 etc. may be used also other than it can be applied to these
To be applied to require the purposes of wide angle.
In addition, lens unit 40 and photographic device 100 are grown by the way that above-mentioned imaging lens system 10 to be packed into, to become and have
Back focal length, wide field angle is ensured that, is being bigbore while poly- when having good optical property and environmental change
Coke deviates small cheap structure.
(embodiment)
Hereinafter, showing the embodiment of imaging lens system of the invention etc..The mark used in embodiments is as described below.
F：F number
w：Maximum full view
PD：Defocusing and (considering refractive index and thermal expansion) when 30 DEG C of temperature variations
R：Radius of curvature
D：Axis upper surface interval
nd：Refractive index of the lens material relative to d line
vd：The Abbe number of lens material
In embodiments, recording the face of " * " behind the number of each face is the face with aspherical shape, aspherical
Shape using the vertex in face as origin, using X-axis as optical axis direction, the height in the direction vertical with optical axis is set as h, to
Under " formula 1 " indicate.
[formula 1]
Wherein,
Ai：I asphericity coefficient
R：Radius of curvature
K：The constant of the cone
(embodiment 1)
The whole element of the imaging lens system of embodiment 1 described below.
F：2.0
w：96.8°
PD：0.0027mm
Table 1 below shows the data of the lens face of the imaging lens system of embodiment 1.In addition, being used in table 1 below is equal
" Surf.N " indicates face number, indicates opening diaphragm with " ST ", indicates infinitely great with " INF ".
(table 1)
Table 2 below shows the asphericity coefficient of the lens face of embodiment 1.In addition, hereafter (lens data including table),
10 power (such as 2.5 × 10 is indicated using E (such as 2.5E-02)-02)。
(table 2)
6th face
K=-2.6946E+00, A4=-1.2155E-02, A6=4.9888E-04, A8=9.5137E-05,
A10=-2.3991E-05, A12=1.4888E-06, A14=0.0000E+00
7th face
K=-1.1866E+00, A4=-9.7766E-03, A6=-3.8798E-04, A8=1.3563E-04,
A10=-7.1703E-06, A12=-3.1353E-07, A14=0.0000E+00
8th face
K=-2.3885E-01, A4=4.1911E-05, A6=-2.3815E-03, A8=4.0207E-04,
A10=-3.3856E-05, A12=1.9613E-06, A14=-8.4247E-08
9th face
K=-2.8858E+00, A4=-1.7658E-03, A6=-9.3635E-04, A8=4.3709E-04,
A10=-8.7673E-05, A12=9.0497E-06, A14=-3.5485E-07
Fig. 2A is the equal cross-sectional view of the imaging lens system 11 of embodiment 1.Imaging lens system 11 has with the flat of negative focal power
Recessed the 1st lens L1, two with positive focal power the 2nd convex lens L2, two with negative focal power the 3rd recessed lens
L3 and two the 4th convex lens L4 with positive focal power.3rd and the 4th lens L3, L4 has non-as optical surface
Spherical surface.1st and the 2nd lens L1, L2 is formed by glass, and the 3rd and the 4th lens L3, L4 is formed by plastics.In the 1st lens L1
Configured with opening diaphragm ST between the 2nd lens L2.Thickness appropriate is configured between the 4th lens L4 and solid-state imager 51
The optical filter F1 of degree.Optical filter F1 is the sealing for being envisioned with optics low pass filter, IR edge filter, solid-state imager 51
The parallel flat of glass etc..Appended drawing reference I indicates the imaging surface for being projected face as solid-state imager 51.In addition, about
Appended drawing reference F1, I is also identical in later embodiment.
Fig. 2 B~2D shows the aberration diagram (spherical aberration, astigmatism and distortion aberration) of the imaging lens system 11 of embodiment 1.
(embodiment 2)
The whole element of the imaging lens system of embodiment 2 described below.
F：2.0
w：97.4°
PD：0.0013mm
Table 3 below shows the data of the lens face of the imaging lens system of embodiment 2.
(table 3)
Table 4 below shows the asphericity coefficient of the lens face of embodiment 2.
(table 4)
6th face
K=-2.5360E+01, A4=-1.6838E-02, A6=2.9078E-03, A8=-5.2744E-04,
A10=5.9126E-05, A12=-2.9430E-06, A14=2.1701E-08
7th face
K=-7.6637E-01, A4=1.9638E-03, A6=-3.0325E-03, A8=5.0220E-04,
A10=-2.9478E-05, A12=-6.8946E-07, A14=9.0652E-08
8th face
K=4.7842E-01, A4=1.5608E-03, A6=-4.1509E-03, A8=8.3052E-04,
A10=-9.8822E-05, A12=7.0248E-06, A14=-2.6726E-07
9th face
K=-1.2941E+00, A4=-9.9983E-05, A6=-6.0676E-04, A8=2.5408E-04
A10=-4.9160E-05, A12=4.9743E-06, A14=-1.8050E-07
Fig. 3 A is the equal cross-sectional view of the imaging lens system 12 of embodiment 2.Imaging lens system 12 has with the flat of negative focal power
Recessed the 1st lens L1, two with positive focal power the 2nd convex lens L2, two with negative focal power the 3rd recessed lens L3
And two the 4th convex lens L4 with positive focal power.3rd and the 4th lens L3, L4 has aspheric as optical surface
Face.1st and the 2nd lens L1, L2 is formed by glass, and the 3rd and the 4th lens L3, L4 is formed by plastics.The 1st lens L1 with
Configured with opening diaphragm ST between 2nd lens L2.Thickness appropriate is configured between the 4th lens L4 and solid-state imager 51
Optical filter F1.
Fig. 3 B~3D shows the aberration diagram (spherical aberration, astigmatism and distortion aberration) of the imaging lens system 12 of embodiment 2.
(embodiment 3)
The whole element of the imaging lens system of embodiment 3 described below.
F：2.0
w：97.4°
PD：-0.0006mm
Table 5 below shows the data of the lens face of the imaging lens system of embodiment 3.
(table 5)
Table 6 below shows the asphericity coefficient of the lens face of embodiment 3.
(table 6)
6th face
K=-2.9216E+01, A4=-1.3523E-02, A6=1.5786E-03, A8=-2.0423E-04,
A10=1.9139E-05, A12=-7.2649E-07, A14=-1.9568E-08
7th face
K=-5.1186E-01, A4=3.7984E-03, A6=-3.9837E-03, A8=7.8640E-04,
A10=-7.3726E-05, A12=3.1569E-06, A14=-5.4749E-08
8th face
K=6.2445E-01, A4=2.5481E-03, A6=-3.9968E-03, A8=7.6921E-04,
A10=-8.3782E-05, A12=5.3296E-06, A14=-1.7574E-07
9th face
K=-1.4447E+00, A4=-4.0836E-05, A6=-7.0313E-04, A8=2.8062E-04,
A10=-5.1193E-05, A12=4.4993E-06, A14=-1.2974E-07
Fig. 4 A is the equal cross-sectional view of the imaging lens system 13 of embodiment 3.Imaging lens system 13 has two with negative focal power
Recessed the 1st lens L1, two with positive focal power the 2nd convex lens L2, two with negative focal power the 3rd recessed lens L3
And two the 4th convex lens L4 with positive focal power.3rd and the 4th lens L3, L4 has aspheric as optical surface
Face.1st and the 2nd lens L1, L2 is formed by glass, and the 3rd and the 4th lens L3, L4 is formed by plastics.The 1st lens L1 with
Configured with opening diaphragm ST between 2nd lens L2.Thickness appropriate is configured between the 4th lens L4 and solid-state imager 51
Optical filter F1.
Fig. 4 B~4D shows the aberration diagram (spherical aberration, astigmatism and distortion aberration) of the imaging lens system 13 of embodiment 3.
(embodiment 4)
The whole element of the imaging lens system of embodiment 4 described below.
F：2.0
w：128°
PD：0.0029mm
Table 7 below shows the data of the lens face of the imaging lens system of embodiment 4.
(table 7)
Table 8 below shows the asphericity coefficient of the lens face of embodiment 4.
(table 8)
6th face
K=-1.8561E+01, A4=-1.1239E-02, A6=6.7090E-04, A8=-8.8165E-05,
A10=3.0806E-06, A12=0.0000E+00, A14=0.0000E+00
7th face
K=-3.7073E+00, A4=-1.1593E-03, A6=6.2674E-04, A8=-2.4716E-04,
A10=3.4931E-05, A12=-1.9241E-06, A14=0.0000E+00
8th face
K=-1.6695E+00, A4=-2.2794E-03, A6=-1.6762E-05, A8=-2.4037E-06,
A10=3.6577E-07, A12=0.0000E+00, A14=0.0000E+00
Fig. 5 A is the equal cross-sectional view of the imaging lens system 14 of embodiment 4.Imaging lens system 14 has two with negative focal power
Recessed the 1st lens L1, two with positive focal power the 2nd convex lens L2, two with negative focal power the 3rd recessed lens L3
And two the 4th convex lens L4 with positive focal power.3rd and the 4th lens L3, L4 is cemented lens.3rd and the 4th
Lens L3, L4 have aspherical as optical surface.1st and the 2nd lens L1, L2 is formed by glass, the 3rd and the 4th lens
L3, L4 are formed by plastics.Configured with opening diaphragm ST between the 1st lens L1 and the 2nd lens L2.In the 4th lens L4 and solid
The optical filter F1 of thickness appropriate is configured between photographing element 51.
Fig. 5 B~5D shows the aberration diagram (spherical aberration, astigmatism and distortion aberration) of the imaging lens system 14 of embodiment 4.
In order to refer to, table 9 below will each Examples 1 to 4 corresponding with each conditional (1)~(8) and (10) value
Summarize.
(table 9)
More than, imaging lens system etc. is illustrated in conjunction with embodiment, but imaging lens system of the invention is not limited to above-mentioned implementation
Mode or embodiment, are able to carry out various modifications.For example, showing the 3rd and the 4th lens in the above-described embodiments, on figure
L3, L4 are not the examples that lens are fitted into each other, but can also be fitted as illustrated in Fig. 1, Fig. 6 etc..
In addition, in the above-described embodiment, about optical filter F1, being used on the way in vehicle-mounted vidicon, surveillance camera etc.
When camera shooting under visible light or near infrared light, additionally it is possible to using optical filter F1 is divided into two panels and is respectively provided with different works
With etc. structures.
Claims (9)
1. a kind of imaging lens system, successively substantially comprises from object side：
1st lens, are formed by glass, have negative focal power, have concave shape in image side surface；
2nd lens, are formed by glass, have positive focal power；
3rd lens, are formed by plastics, have negative focal power, have at least one aspherical shape；And
4th lens, are formed by plastics, have positive focal power, have at least one aspherical shape,
Meet conditional below,
0.8 < f12/f < 1.2 ... (1)
- 1.65 < f3/f4 < -0.8 ... (2)
0≤D34/f < 0.04 ... (3)
Wherein,
f：The focal length of lens whole system
f12：The synthesis focal length of 1st lens and the 2nd lens
f3：The focal length of 3rd lens
f4：The focal length of 4th lens
D34：The interval on optical axis of 3rd lens and the 4th lens.
2. imaging lens system according to claim 1, wherein
The material of 1st lens~the 4th lens meets conditional below,
70 < vd1 < 100 ... (4)
30 < vd2 < 50 ... (5)
20 < vd3 < 30 ... (6)
50 < vd4 < 60 ... (7)
Wherein,
vd1：Abbe number under the d line of 1st lens
vd2：Abbe number under the d line of 2nd lens
vd3：Abbe number under the d line of 3rd lens
vd4：Abbe number under the d line of 4th lens.
3. imaging lens system according to claim 1 or 2, wherein
The imaging lens system has the diaphragm being configured between the 1st lens and the 2nd lens, will lean on object from the diaphragm
When side is set as pre-group, will be set as rear group by image side, meet conditional below,
- 1.2 < ff/fr < -1.0 ... (8)
Wherein,
ff：The focal length of the pre-group
fr：The focal length of group after described.
4. imaging lens system according to any one of claims 1 to 3, wherein
3rd lens are that lens are chimeric each other with the 4th lens.
5. imaging lens system described in any one according to claim 1~4, wherein
It is aspherical that 1st and the 2nd lens are respectively provided at least one.
6. imaging lens system according to any one of claims 1 to 5, wherein
The imaging lens system meets conditional below,
R2 < | R1 | ... (9)
Wherein,
R1：The radius of curvature of the side of the object of 1st lens
R2：The radius of curvature of the image side surface of 1st lens.
7. imaging lens system according to any one of claims 1 to 6, wherein
The imaging lens system meets conditional below,
1.3 < D12/f < 2.2 ... (10)
Wherein,
f：The focal length of whole system
D12：The interval on optical axis of 1st lens and the 2nd lens.
8. a kind of lens unit, has：
Imaging lens system described in any one in claim 1~7；And
Lens barrel keeps the imaging lens system.
9. a kind of photographic device, has：
Lens unit according to any one of claims 8；And
Photographing element projects the picture based on the lens unit.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2016-074265 | 2016-04-01 | ||
| JP2016074265 | 2016-04-01 | ||
| PCT/JP2017/013195 WO2017170843A1 (en) | 2016-04-01 | 2017-03-30 | Imaging lens, lens unit, and imaging device |
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| CN108885330A true CN108885330A (en) | 2018-11-23 |
| CN108885330B CN108885330B (en) | 2020-11-24 |
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| JP (1) | JP6635190B2 (en) |
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| CN117806009A (en) * | 2024-02-29 | 2024-04-02 | 江西联益光学有限公司 | Day and night confocal lens |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2017170843A1 (en) | 2019-02-14 |
| WO2017170843A1 (en) | 2017-10-05 |
| JP6635190B2 (en) | 2020-01-22 |
| CN108885330B (en) | 2020-11-24 |
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