CN110297305A - Optical system, lens unit and filming apparatus - Google Patents

Abstract

One kind optical system that is small-sized and can ensuring good optical property, lens unit and filming apparatus are provided.Photographing optical system (10) substantially successively includes the 1st lens (L1) with negative refractive power from object side, the 2nd lens (L2) with negative refractive power, the 3rd lens (L3) with positive refractive power, diaphragm (ST), the 4th lens (L4) with negative refractive power, the 5th lens (L5) with positive refractive power, and the 6th lens (L6), the side of the object of 2nd lens (L2) has convex face shape, the side of the object of 6th lens (L6) has recessed face shape, value ν d3 is set as to the Abbe number of the 3rd lens (L3), meet conditional below (1): d3 >=40 ... ν (1).

Description

Optical system, lens unit and filming apparatus

Technical field

The present invention is more particularly directed to the optical systems for filming apparatus such as in-vehicle camera, portable terminal camera, supervision cameras And have the lens unit and filming apparatus of the optical system.

Background technique

In recent years, it is known that a kind of small-sized bat for filming apparatus such as in-vehicle camera, portable terminal camera, supervision cameras Take the photograph lens (for example, referring to Patent Documents 1 to 3).For such filming apparatus CCD (Charge Coupled Device, Charge-coupled device) and type imaging sensor or CMOS (Complementary Metal Oxide Semiconductor, it is complementary Metal-oxide semiconductor (MOS)) capturing elements such as type imaging sensor are sought high pixelation and miniaturization.Along with this, having The capture apparatus main body of these capturing elements is also increasingly miniaturized, to carry capture lens thereon also in addition to require it is bright and Except good optical property, miniaturization and lightweight are also required.

In the optical system of patent document 1, leads to excessive use plastic lens and realize inexpensive design.But F Value does not become the bright optical system of the F value required in recent years secretly to 2.0.In addition, the focal length relative to whole system, overall length Become larger, the miniaturization of optical system is not implemented.

In the optical system of patent document 2, also by the design for mostly realizing low cost using plastic lens.But Be, due to mostly using plastic lens and optical property is lower, be not implemented optical system high performance.

In the optical system of patent document 3, also by the design for mostly realizing low cost using plastic lens.But It is that F value secretly to 2.3, can not become the bright optical system of the F value required in recent years.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2017-037119 bulletin

Patent document 2: Japanese Unexamined Patent Publication 2017-044731 bulletin

Patent document 3: Japanese Unexamined Patent Publication 2017-167253 bulletin

Summary of the invention

The present invention proposes, and it is an object of the present invention to provide small-sized and can ensure good optical property in view of the aforementioned technical background Optical system.

In addition, the purpose of the present invention is to provide assemble the lens unit and filming apparatus of above-mentioned optical system.

At least one of in order to achieve the above purpose, the optical system of one aspect of the present invention is reflected, from object It substantially successively includes: the 1st lens with negative refractive power that side, which is risen,；The 2nd lens with negative refractive power；With positive 3rd lens of refractive power；Diaphragm；The 4th lens with negative refractive power；The 5th lens with positive refractive power；And the 6th Lens, the side of the object of the 2nd lens have convex face shape, and the side of the object of the 6th lens has recessed face shape, meet following Conditional:

40≤νd3…(1)

Wherein, value ν d3 is the Abbe number of the 3rd lens.

At least one of in order to achieve the above purpose, reflect one aspect of the present invention lens unit have on The lens barrel of the optical system and holding optical system stated.

At least one of in order to achieve the above purpose, reflect one aspect of the present invention filming apparatus have on The capturing element for the picture that the optical system and detection stated are obtained from optical system.

Detailed description of the invention

Fig. 1 is the lens unit and filming apparatus for the photographing optical system that explanation has an embodiment of the invention Figure.

Fig. 2 (A) is the sectional view of photographing optical system of embodiment 1 etc., and Fig. 2 (B)~2 (D) is aberration diagram.

Fig. 3 (A) is the sectional view of photographing optical system of embodiment 2 etc., and Fig. 3 (B)~3 (D) is aberration diagram.

Fig. 4 (A) is the sectional view of photographing optical system of embodiment 3 etc., and Fig. 4 (B)~4 (D) is aberration diagram.

Fig. 5 (A) is the sectional view of photographing optical system of embodiment 4 etc., and Fig. 5 (B)~5 (D) is aberration diagram.

Fig. 6 (A) is the sectional view of photographing optical system of embodiment 5 etc., and Fig. 6 (B)~6 (D) is aberration diagram.

Fig. 7 (A) is the sectional view of photographing optical system of embodiment 6 etc., and Fig. 7 (B)~7 (D) is aberration diagram.

Fig. 8 (A) is the sectional view of photographing optical system of embodiment 7 etc., and Fig. 8 (B)~8 (D) is aberration diagram.

Fig. 9 (A) is the sectional view of photographing optical system of embodiment 8 etc., and Fig. 9 (B)~9 (D) is aberration diagram.

Figure 10 (A) is the sectional view of photographing optical system of embodiment 9 etc., and Figure 10 (B)~10 (D) is aberration diagram.

Figure 11 (A) is the sectional view of photographing optical system of embodiment 10 etc., and Figure 11 (B)~11 (D) is aberration diagram.

Specific embodiment

Fig. 1 is sectional view of the explanation as the filming apparatus 100 of an embodiment of the invention.Filming apparatus 100 has Its is set to play the function as filming apparatus 100 for the camera model 30 for forming picture signal and and making camera model 30 work The processing unit 60 of energy.

Camera model 30 have built-in photographing optical system 10 lens unit 40 and will be by 10 shape of photographing optical system At shot object image be transformed to the sensor portion 50 of picture signal.

Lens unit 40 has photographing optical system 10 and supports the lens barrel 41 of photographing optical system 10.Photographing optical system 10 are made of the 1st~the 6th lens L1~L6.Lens barrel 41 is by resin, metal, the shapes such as material for being mixed in resin glass fibre At, store in inside and keep lens etc..In the metal of lens barrel 41, it is mixed in resin the feelings that the material of glass fibre formed Under condition, it is not easy to thermally expand compared with resin, it being capable of steadily establishing shot optical system 10.Lens barrel 41 has for coming from object side Light incidence opening OP.

The full view of photographing optical system 10 is 120 ° or more.1st~the 6th lens L1 of composition photographing optical system 10~ L6 is directly or indirectly held in the inner surface side of lens barrel 41 in their flange part or peripheral part, carries out about the optical axis side AX To and with the vertical direction optical axis AX positioning.Lens barrel 41 also carries as diaphragm (aperture diaphragm) ST, optical filter F1 Optical parameter in addition to lens L1~L6.

Sensor portion 50 has: the solid-state image pickup of light-to-current inversion is carried out to the shot object image formed by photographing optical system 10 Element 51, the substrate 52 for supporting the solid-state image pickup element 51 and the sensor branch that solid-state image pickup element 51 is kept via substrate 52 Frame 53.Solid-state image pickup element 51 is, for example, cmos type imaging sensor.Substrate 52 has for making 51 work of solid-state image pickup element Wiring, peripheral circuit of work etc..Sensor stand 53 is formed by resin or other materials, by solid-state image pickup element 51 relative to light Axis AX is positioned.The state quilt that the lens barrel 41 of lens unit 40 is positioned in a manner of by sensor support body 53 is embedded in It is fixed.

Solid-state image pickup element (capturing element) 51 has the photoelectric conversion department 51a as shooting face I, is formed in its periphery Signal processing circuit (not shown).The pixel i.e. components of photo-electric conversion are two-dimensionally configured in photoelectric conversion department 51a.In addition, solid Capturing element 51 is not limited to above-mentioned cmos type imaging sensor, is also possible to assemble other capturing elements such as CCD Element.

Optical filter can be configured between the lens for constituting lens unit 40 or between lens unit 40 and sensor portion 50 Deng.In the example in fig 1, optical filter F1 is configured between the 6th lens L6 of photographing optical system 10 and solid-state image pickup element 51. Optical filter F1 is the parallel of seal glass for contemplating optical low pass filter, IR cut-off filter, solid-state image pickup element 51 etc. Plate.Although optical filter F1 can be used as the filter part configuration of separate component, but can also configure not as separate component, and It is to assign the function to any lens face for constituting photographing optical system 10.For example, in the case where IR-cut filter, It can implement infrared cutoff coating on the surface of 1 or 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 drives Dynamic portion 61 makes solid-state image pickup element 51 work and controlling signal to outputs such as the circuits for accompanying solid-state image pickup element 51.Member Part driving portion 61 can receive the supply or energy for driving the voltage of solid-state image pickup element 51, clock signal from control unit 68 It is enough by YUV corresponding with the output signal of solid-state image pickup element 51 or other digital pixel signals to external circuit output.It is defeated Entering portion 62 is the part for accepting the operation of user, and storage unit 63 is information needed for the work of keeping filming apparatus 100, by phase The part of the image data that machine module 30 obtains etc., display unit 64 are to show the information that should be prompted to user, photograph The part of image etc..The work of the blanket ground of control unit 68 control element driving portion 61, input unit 62, storage unit 63 etc., such as can It is enough that various image procossings are carried out to the image data obtained by camera model 30.By filming apparatus 100 for example as vehicle-mounted phase In the case where machine use, image procossing appropriate is implemented to show image to driver.

Although the concrete function of processing unit 60 can be according to assembling this filming apparatus 100 in addition, omitting detailed description The purposes of equipment carry out appropriate adjustment.Filming apparatus 100 can be equipped on the dress for various purposes such as in-vehicle camera, supervision camera It sets.

Hereinafter, referring to Fig.1, being illustrated to the photographing optical system 10 etc. of the 1st embodiment.In addition, illustrated in Fig. 1 Photographing optical system 10 becomes the photographing optical system 10A same structure with following embodiments 1.

The photographing optical system 10 of diagram substantially successively includes the 1st lens with negative refractive power from object side L1, the 2nd lens L2 with negative refractive power, the 3rd lens L3 with positive refractive power, diaphragm ST, with negative refractive power The 4th lens L4, with the 5th lens L5 of positive refractive power and the 6th lens L6.

In above-mentioned photographing optical system 10, diaphragm ST is configured between the 3rd lens L3 and the 4th lens L4, accordingly light Late ST can be configured at the immediate vicinity of optical system.Thereby, it is possible to take into account front lens (that is, the 1st lens L1) and rear lens The path of (that is, the 6th lens L6).In addition, can make to penetrate exit pupil position from bat if diaphragm ST is configured at more by object side It takes the photograph that face I is separate, therefore can ensure required telecentricity when using solid-state image pickup elements 51 such as CMOS, CCD, before capable of making thoroughly Mirror diameter miniaturization, but there are problems that rear lens diameter can enlargement this.On the other hand, if diaphragm ST is configured at more by picture Side can then be such that rear lens diameter minimizes, but penetrate exit pupil position accordingly, it is difficult to ensure telecentricity, and to deposit closer to image side In this enlarged problem of front lens diameter meeting.

In addition, above-mentioned photographing optical system 10 is configured with 2 negative lenses in object side, to be rendered as inverse coke (retrofocus) type.Thereby, it is possible to make entrance pupil be located closer to object side, so front lens diameter can be made to minimize While realize wide angle.In addition, with negative lens be 1 the case where compared with, focal power can be divided, so can reduce Coma, astigmatism, the curvature of field and the distortion that 1st and the 2nd lens L1, L2 is generated.In addition, by segmentation focal power, with by 1 thoroughly Microscope group compares loaded on the case where lens barrel 41, when can reduce relative to the 1st and the 2nd lens L1, L2 is assembled in lens barrel 41 Core shift error aberration change, so production can be made to improve.

In addition, can be by the way that position before diaphragm ST will be located at and the 3rd lens L3 passed through for thick light beam is set For positive lens, Lai Xiuzheng is in the 1st and the 2nd lens L1, L2 spherical aberration generated and coma.In addition, for diaphragm ST For being located at the 4th and the 5th lens L4, L5 of image side, pass through thick light, therefore, the 4th and the 5th in entire image height Lens L4, L5 are big to the contribution degree of light.Therefore, by by compared with diaphragm ST be located at image side the 4th and the 5th lens L4, L5 is formed as the structure of negative lens and positive lens, can effectively correct color difference and ratio chromatism, on axis.In addition, by as above The lens for configuring be located at image side compared with diaphragm ST like that are stated, can reduce outside the axis later as the 5th lens L5 of positive lens Therefore height of the light away from optical axis AX can minimize rear lens diameter.

In addition, the generation of the curvature of field and distortion that are able to suppress under high image height therefore can by having the 6th lens L6 Ensure good optical property.

In addition, the 6th lens L6 can have negative and positive arbitrary refractive index, more preferably there is negative refractive power.? In the case that 6th lens L6 has negative refractive power, the image side principle point location from the image side surface of the 6th lens L6 can be made more to lean on Therefore object side can be such that overall length minimizes.In addition, due to that can make through the off-axis ray after the 6th lens L6 to away from optical axis The direction of AX high reflects, therefore can reduce the ray height of the off-axis ray by the 6th lens L6, can make the 6th lens L6 Path.

1st lens L1 has spherical shape.The light for being configured at the high image height of the 1st lens L1 near object side passes through phase For the position of optical axis AX high.Therefore, the diameter of the 1st lens L1 tends to get bigger.By making the 1st lens L1 spherical lens, energy It is enough that cost is reduced compared with non-spherical lens.

The side of the object of 2nd lens L2 is in convex face shape.In general, the normal of lens face and light angulation It is smaller, more it is able to suppress the generation of aberration.In the 2nd lens L2, the 2nd lens L2 is big to the contribution of the light of high image height.Pass through Make the 2nd lens L2 object side have convex form negative falcate (bumps) lens, can reduce high image height light and The normal angulation of lens face is able to suppress the curvature of field and distortion in the side of the object generation of the 2nd lens L2, therefore energy Enough ensure good optical property.

The side of the object of 6th lens L6 has recessed face shape.As a result, more particularly to reducing the light and lens of high image height The curvature of field and distortion generated in the side of the object of the 6th lens L6 can be inhibited smaller by the normal angulation in face, because This, it can be ensured that good optical property.

At least one of 2nd and the 3rd lens L2, L3 is with aspherical shape, and the 4th~the 6th lens L4~L6 is at least One has aspherical shape.Thereby, it is possible to effectively correct each aberration, it can be ensured that good optical property.

1st lens L1 is glass lens.1st lens of the optical system used in vehicle-mounted lens, monitoring lens L1 becomes the state exposed relative to the external world, and therefore, lens face is easy to scratch, it is possible to make optical performance degradation.By making the 1st Lens L1 is glass lens, can prevent the scuffing to lens face, can ensure while improving environmental suitability good Optical property.

Additionally, it is preferred that the 2nd~the 6th lens L2~L6 is also glass lens.Glass lens is compared with plastic lens, temperature Variations in refractive index under variation is small.Logical excessive use plastic lens can be realized low cost, but become in temperature change and humidity The reason of changing under big such harsh environment, becoming optical property variation.Therefore, by making to constitute comprising the 2nd~the 6th lens L2 All lens of optical system including~L6 are glass lens, even if also can be realized optical property under harsh environment Change small optical system.

Photographing optical system 10 meets conditional below.

40≤νd3…(1)

Wherein, value ν d3 is the Abbe number of the 3rd lens L3.

3rd lens L3 be located at tightly the position before diaphragm ST, thick light pass through in each image height, but each image height away from light The light of axis AX is lower by height, therefore, is especially become larger to the contribution degree of axis glazed thread.By the value ν d3 for making conditional (1) More than lower limit, can color difference on axis be inhibited smaller, it can be ensured that good optical property.

Photographing optical system 10 meets conditional below.

1.5<f123/f456…(2)

Wherein, value f123 is the synthesis focal length from the 1st lens L1 to the 3rd lens L3, and value f456 is from the 4th lens L4 to The synthesis focal length of 6 lens L6.

In addition, photographing optical system 10 more preferably meets conditional below.

1.5<f123/f456<15…(2)’

Conditional (2) defines the synthesis focal length from the 1st lens L1 to the 3rd lens L3 relative to from the 4th lens L4 to the 6th The ratio between synthesis focal length of lens L6.By make conditional (2) value f123/f456 be higher than lower limit, relative to from the 4th lens L4 to The synthesis focal length of 6th lens L6 will not become too small from the synthesis focal length of the 1st lens L1 to the 3rd lens L3.Therefore, by the 1st Image side principle point location that lens L1 is constituted to the 6th lens L6, from the image side surface of the 6th lens L6, which will not be located at, more leans on object Side, back focal length will not be too short.It is accordingly possible to ensure being inserted into optical light filter after the lens of image side i.e. the 6th lens L6 The space of equal optical elements.In addition, enabling to dust to be not easy to mirror figure when dust is attached on the lens face near image side Picture.

Photographing optical system 10 meets conditional below.

4.5<f123/f…(3)

Wherein, value f is the focal length of whole system.

In addition, photographing optical system 10 more preferably meets conditional below.

4.5<f123/f<25…(3)’

Conditional (3) define from the 1st lens L1 to the 3rd lens L3 synthesis focal length relative to whole system focal length it Than.By making the value f123/f of conditional (3) be higher than lower limit, will not become from the synthesis focal length of the 1st lens L1 to the 3rd lens L3 It is too small.Therefore, it will not become too strong, be able to suppress in the 1st lens L1 from the synthesis focal power of the 1st lens L1 to the 3rd lens L3 Each aberration generated to the 3rd lens L3, it can be ensured that good optical property.In addition, due to from the 1st lens L1 to the 3rd lens The synthesis focal power of L3 will not be too strong, therefore, can prevent the enlargement of front lens diameter.

Photographing optical system 10 meets conditional below.

3.5<L/f<5.5…(4)

Wherein, value L is the overall length (that is, the distance of the face near object side of optical system to imaging surface) of whole system.

Conditional (4) defines focal length the ratio between of the overall length relative to whole system.In the past, as inverse burnt type, using The optical system that object side is configured with the structure of strong negative lens is more, since entrance pupil is located proximate to object side, can Wide angle is realized while minimizing front lens diameter, and still, principle point location is easy to be located at image side, exists relative to coke Away from this elongated problem of overall length.By meeting conditional (4), the short small-sized optics of overall length can be realized although focal length is long System.By making the value L/f of conditional (4) lower than the upper limit, overall length can be made to shorten relative to focal length.On the other hand, by making The value L/f of conditional (4) is higher than lower limit, will not become too short relative to focal length overall length, each power of lens of optical system It will not become too strong, therefore, be able to suppress each aberration generated in each lens, it can be ensured that good optical property.

Photographing optical system 10 meets conditional below.

f2/f<-2.5…(5)

Wherein, value f2 is the focal length of the 2nd lens L2.

In addition, photographing optical system 10 more preferably meets conditional below.

-25<f2/f<-2.5…(5)’

Conditional (5) defines focal length the ratio between of the focal length of the 2nd lens L2 relative to whole system.In the 2nd lens L2, The light of especially high image height passes through in the position relative to optical axis AX high, and therefore, the influence generated to the light of high image height becomes Greatly.It is lower than the upper limit by the value f2/f of conditional (5), the focal length of the 2nd lens L2 will not be too short.Therefore, it is able to suppress because of the 2nd thoroughly The focal power of mirror L2 is become too strong and the curvature of field and distortion at the high image height that generates.In addition, due to the 2nd lens L2 focal length not Become too short, therefore, is able to suppress and is changed relative to the aberration of core shift error when the 2nd lens L2 to be assembled into lens barrel 41.Root According to above content, by meeting conditional (5), can be realized the miniaturization of optical system and ensuring good optical characteristics.

Photographing optical system 10 meets conditional below.

54≤νd1…(6)

Wherein, value ν d1 is the Abbe number of the 1st lens L1.

It is that the light of high image height passes through the lens of highest position positioned at the 1st lens L1 near object side.Therefore, the 1st Influence of the lens L1 to the light of high image height is big, and especially in terms of color difference, the influence to ratio chromatism, becomes larger.Therefore, by Using the glass material for meeting conditional (6) in 1st lens L1, it is able to suppress times of the 1st lens L1 generated at high image height Rate color difference, it can be ensured that good optical property.

Photographing optical system 10 meets conditional below.

35≤νd6…(7)

Wherein, value ν d6 is the Abbe number of the 6th lens L6.

6th lens L6 of position closest to the image side is that the light of high image height passes through the lens of highest position.Therefore, Influence of the 6th lens L6 to the light of high image height is big, and especially in terms of color difference, the influence to ratio chromatism, can become larger.Therefore, lead to It crosses in the 6th lens L6, using the glass material for meeting conditional (7), is able to suppress generating at high image height for the 6th lens L6 Ratio chromatism, it can be ensured that good optical property.

Photographing optical system 10 meets conditional below.

35<νd5-νd4…(8)

Wherein, value ν d4 is the Abbe number of the 4th lens L4, and value ν d5 is the Abbe number of the 5th lens L5.

4th and the 5th lens L4, L5 is located at the position after diaphragm ST, since thick light beam passes through in each image height, Therefore, influence of the 4th and the 5th lens L4, the L5 to color difference on axis and ratio chromatism, is big.By the value ν for making conditional (8) D5- ν d4 is higher than lower limit, and color difference can be made on the axis of the 4th lens L4 generation with negative focal power with positive light focus 5th lens L5 of degree is generated in reverse direction, therefore, can offset color difference on axis by the 4th and the 5th lens L4, L5.As a result, It is able to suppress color difference on axis.

In addition, photographing optical system 10 can also have substantially without focal power other optical elements (such as Lens, filter part etc.).

Photographing optical system 10 described above is in small-sized and with lens arrangement as described above and has good Optical property.

(embodiment)

Hereinafter, showing the embodiment of photographing optical system of the invention etc..Symbol used in each embodiment is as follows.

F: the focal length of whole system

Fno:F number

2w: maximum full view

ENTP: entrance pupil position (from the 1st face to the distance of entrance pupil position)

EXTP: penetrate exit pupil position (from shooting face to the distance for penetrating exit pupil position)

R: radius of curvature

D: face interval on axis

Nd: refractive index of the lens material relative to d line

Vd: the Abbe number of lens material

ED: effective diameter

In embodiments, being labeled with the face of " * " after the number of each face is the face with aspherical shape, about aspheric The shape in face, is set as origin for the vertex in face, takes X-axis in the direction of the optical axis, and the height in the direction vertical with optical axis is set as h, It is indicated with " formula 1 " below.

[formula 1]

Wherein,

Ai:i asphericity coefficient

R: radius of curvature

K: the constant of the cone

(embodiment 1)

By the overall specifications of the photographing optical system of embodiment 1 described below.

F=5.11 (mm)

Fno=1.60

(2w=120.00 °)

ENTP=5.19 (mm)

EXTP=-4.77 (mm)

The data of the lens face of the photographing optical system of embodiment 1 are shown in table 1 below.In addition, below In table 1 etc., face number is indicated with " Surf.N ", indicates aperture diaphragm with " ST ", indicate infinitely great with " INF ".

(table 1)

The asphericity coefficient of the lens face of embodiment 1 is shown in table 2 below.In addition, (including the saturating of table later Mirror data), it is set as indicating 10 power (such as 2.5 × 10 using E (such as 2.5E-02)^-02)。

(table 2)

3rd face

K=1.074532E-01, A4=-1.624884E-03, A6=-2.328955E-04,

A8=5.001098E-06, A10=0.000000E+00

4th face

K=-8.986798E-01, A4=1.470839E-03, A7=-2.647765E-04,

A8=1.291450E-05, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-5.290430E-03, A8=4.261773E-04,

A8=-3.650813E-05, A10=1.608478E-06

13rd face

K=0.000000E+00, A4=-8.969457E-03, A6=3.647311E-04,

A8=-9.201162E-06, A10=1.730727E-07

The simple lens data of embodiment 1 are shown in table 3 below.

(table 3)

Fig. 2 (A) is the sectional view of photographing optical system 10A of embodiment 1 etc..Photographing optical system 10A has: having negative Refractive power and object side in convex curved month type the 1st lens L1, with negative refractive power and object side be in convex bent moon 2nd lens L2 of type, with positive refractive power and in the 3rd lens L3 of biconvex, with negative refractive power and in object side in convex Curved month type the 4th lens L4, with positive refractive power and in biconvex the 5th lens L5, with negative refractive power and in object Side is in the 6th lens L6 of recessed curved month type.1st, the 3rd~the 5th lens L1, L3~L5 has spherical surface as optical surface.2nd and 6th lens L2, L6 has aspherical as optical surface.4th and the 5th lens L4, L5 is engagement made of being engaged with bonding agent Lens.1st~the 6th lens L1~L6 is formed by glass.Diaphragm (aperture is configured between the 3rd lens L3 and the 4th lens L4 Diaphragm) ST.The optical filter F1 of thickness appropriate is configured between the 6th lens L6 and solid-state image pickup element 51.Optical filter F1 is Assume the parallel flat of seal glass of optical low pass filter, IR cut-off filter, solid-state image pickup element 51 etc..Label I Indicate the shooting face for being projected face as solid-state image pickup element 51.In addition, about label F1, I, in later embodiment Equally.

Fig. 2 (B)~2 (D) shows aberration diagram (spherical aberration, astigmatism and abnormal of the photographing optical system 10A of embodiment 1 Become).

(embodiment 2)

By the overall specifications of the photographing optical system of embodiment 2 described below.

F=4.87 (mm)

Fno=1.60

(2w=120.00 °)

ENTP=5.14 (mm)

EXTP=-4.93 (mm)

The data of the lens face of the photographing optical system of embodiment 2 are shown in table 4 below.

(table 4)

The asphericity coefficient of the lens face of embodiment 2 is shown in table 5 below.

(table 5)

3rd face

K=8.490109E-02, A4=-2.889466E-03, A6=-1.038759E-04,

A8=1.558407E-06, A10=0.000000E+00

4th face

K=-1.079921E+00, A4=-1.493043E-03, A6=-1.889487E-04,

A8=1.146423E-05, A10=0.000000E+00

5th face

K=0.000000E+00, A4=-1.137313E-03, A6=2.594269E-06, A8=0.000000E+00, A10=0.000000E+00

6th face

K=0.000000E+00, A4=4.903884E-05, A6=3.578433E-05,

A8=0.000000E+00, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-8.493088E-03, A6=1.093650E-03,

A8=-1.632637E-04, A10=8.691583E-06

13rd face

K=0.000000E+00, A4=-8.208992E-03, A6=5.511346E-04,

A8=-4.489897E-05, A10=1.472478E-06

The simple lens data of embodiment 2 are shown in table 6 below.

(table 6)

Fig. 3 (A) is the sectional view of photographing optical system 10B of embodiment 2 etc..Photographing optical system 10B has: having negative Refractive power and object side in convex curved month type the 1st lens L1, with negative refractive power and object side be in convex bent moon 2nd lens L2 of type, with positive refractive power and in the 3rd lens L3 of biconvex, with negative refractive power and in object side in convex Curved month type the 4th lens L4, with positive refractive power and in biconvex the 5th lens L5, with negative refractive power and in object Side is in the 6th lens L6 of recessed curved month type.1st, the 4th and the 5th lens L1, L4, L5 have spherical surface as optical surface.2nd, 3rd and the 6th lens L2, L3, L6 has aspherical as optical surface.4th and the 5th lens L4, L5 is to be engaged with bonding agent Made of cemented lens.1st~the 6th lens L1~L6 is formed by glass.It is configured between the 3rd lens L3 and the 4th lens L4 There is diaphragm (aperture diaphragm) ST.The optical filter F1 of thickness appropriate is configured between the 6th lens L6 and solid-state image pickup element 51.

Fig. 3 (B)~3 (D) shows aberration diagram (spherical aberration, astigmatism and abnormal of the photographing optical system 10B of embodiment 2 Become).

(embodiment 3)

By the overall specifications of the photographing optical system of embodiment 3 described below.

F=3.57 (mm)

Fno=1.60

(2w=170.00 °)

ENTP=4.28 (mm)

EXTP=-4.75 (mm)

The data of the lens face of the photographing optical system of embodiment 3 are shown in table 7 below.

(table 7)

The asphericity coefficient of the lens face of embodiment 3 is shown in table 8 below.

(table 8)

3rd face

K=7.190465E-01, A4=-1.049769E-03, A6=-2.005107E-04,

A8=0.000000E+00, A10=0.000000E+00

4th face

K=-2.022474E+00, A4=1.107115E-02, A6=-6.137177E-04,

A8=0.000000E+00, A10=0.000000E+00

5th face

K=0.000000E+00, A4=-2.903510E-03, A6=-1.276619E-04,

A8=0.000000E+00, A10=0.000000E+00

6th face

K=0.000000E+00, A4=-4.992387E-04, A6=1.483626E-05,

A8=0.000000E+00, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-7.969897E-03, A6=8.653563E-04,

A8=-1.477482E-04, A10=0.000000E+00

13rd face

K=0.000000E+00, A4=-8.819385E-03, A6=2.070926E-04,

A8=-1.757791E-05, A10=0.000000E+00

The simple lens data of embodiment 3 are shown in table 9 below.

(table 9)

Fig. 4 (A) is the sectional view of photographing optical system 10C of embodiment 3 etc..Photographing optical system 10C has: having negative Refractive power and object side in convex curved month type the 1st lens L1, with negative refractive power and object side be in convex bent moon 2nd lens L2 of type, with positive refractive power and object side in recessed curved month type the 3rd lens L3, with negative refractive power And object side in convex curved month type the 4th lens L4, with positive refractive power and in biconvex the 5th lens L5, with negative Refractive power and object side be in recessed curved month type the 6th lens L6.1st, the 4th and the 5th lens L1, L4, L5 make with spherical surface For optical surface.2nd, the 3rd and the 6th lens L2, L3, L6 have aspherical as optical surface.1st~the 6th lens L1~L6 is It is formed by glass.Diaphragm (aperture diaphragm) ST is configured between the 3rd lens L3 and the 4th lens L4.In the 6th lens L6 and solid The optical filter F1 of thickness appropriate is configured between capturing element 51.

Fig. 4 (B)~4 (D) shows aberration diagram (spherical aberration, astigmatism and abnormal of the photographing optical system 10C of embodiment 3 Become).

(embodiment 4)

By the overall specifications of the photographing optical system of embodiment 4 described below.

F=4.95 (mm)

Fno=1.60

(2w=120.00 °)

ENTP=5.23 (mm)

EXTP=-6.06 (mm)

The data of the lens face of the photographing optical system of embodiment 4 are shown in table 10 below.

(table 10)

The asphericity coefficient of the lens face of embodiment 4 is shown in table 11 below.

(table 11)

3rd face

K=2.017233E-01, A4=-1.987446E-03, A6=-1.209980E-04,

A8=0.000000E+00, A10=0.000000E+00

4th face

K=-8.159516E-01, A4=-3.217344E-04, A6=-3.401830E-04,

A8=1.939074E-05, A10=0.000000E+00

5th face

K=0.000000E+00, A4=-1.789504E-03, A6=0.000000E+00,

A8=0.000000E+00, A10=0.000000E+00

6th face

K=0.000000E+00, A4=-1.289295E-04, A6=0.000000E+00,

A8=0.000000E+00, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-7.637974E-03, A6=3.137057E-04,

A8=-4.227067E-05, A10=0.000000E+00

13rd face

K=0.000000E+00, A4=-7.966052E-03, A6=1.707259E-04,

A8=-6.891223E-06, A10=0.000000E+00

The simple lens data of embodiment 4 are shown in table 12 below.

(table 12)

Fig. 5 (A) is the sectional view of photographing optical system 10D of embodiment 4 etc..Photographing optical system 10D has: having negative Refractive power and be the 1st lens L1 of convex curved month type in object side, with negative refractive power and in object side be convex bent moon 2nd lens L2 of type, with positive refractive power and object side be recessed curved month type the 3rd lens L3, with negative refractive power And it is the 4th lens L4 of convex curved month type, the 5th lens L5 with positive refractive power and biconvex, bends with negative in object side Luminous power and object side be recessed curved month type the 6th lens L6.1st, the 4th and the 5th lens L1, L4, L5 have spherical surface conduct Optical surface.2nd, the 3rd and the 6th lens L2, L3, L6 have aspherical as optical surface.4th and the 5th lens L4, L5 be Cemented lens made of being engaged with bonding agent.1st~the 6th lens L1~L6 is formed by glass.It is saturating in the 3rd lens L3 and the 4th Diaphragm (aperture diaphragm) ST is configured between mirror L4.Thickness appropriate is configured between the 6th lens L6 and solid-state image pickup element 51 The optical filter F1 of degree.

Fig. 5 (B)~5 (D) shows aberration diagram (spherical aberration, astigmatism and abnormal of the photographing optical system 10D of embodiment 4 Become).

(embodiment 5)

By the overall specifications of the photographing optical system of embodiment 5 described below.

F=4.93 (mm)

Fno=1.60

(2w=120.00 °)

ENTP=5.15 (mm)

EXTP=-6.37 (mm)

The data of the lens face of the photographing optical system of embodiment 5 are shown in table 13 below.

(table 13)

The asphericity coefficient of the lens face of embodiment 5 is shown in table 14 below.

(table 14)

3rd face

K=3.316209E-01, A4=-2.113593E-03, A6=-1.210219E-04,

A8=0.000000E+00, A10=0.000000E+00

4th face

K=-3.331985E-01, A4=-2.956339E-03, A6=-3.522070E-04,

A8=0.000000E+00, A10=0.000000E+00

5th face

K=0.000000E+00, A4=-1.567304E-03, A6=0.000000E+00,

A8=0.000000E+00, A10=0.000000E+00

6th face

K=0.000000E+00, A4=-1.525632E-04, A6=0.000000E+00,

A8=0.000000E+00, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-6.802468E-03, A6=2.121134E-04,

A8=-3.608763E-05, A10=0.000000E+00

13rd face

K=0.000000E+00, A4=-6.768958E-03, A6=9.308062E-05,

A8=-3.375939E-06, A10=0.000000E+00

The simple lens data of embodiment 5 are shown in table 15 below.

(table 15)

Fig. 6 (A) is the sectional view of photographing optical system 10E of embodiment 5 etc..Photographing optical system 10E has: having negative Refractive power and object side in convex curved month type the 1st lens L1, with negative refractive power and object side be in convex bent moon 2nd lens L2 of type, with positive refractive power and object side in recessed curved month type the 3rd lens L3, with negative refractive power And object side in convex curved month type the 4th lens L4, with positive refractive power and in biconvex the 5th lens L5, with negative Refractive power and object side be in recessed curved month type the 6th lens L6.1st, the 4th and the 5th lens L1, L4, L5 make with spherical surface For optical surface.2nd, the 3rd and the 6th lens L2, L3, L6 have aspherical as optical surface.4th and the 5th lens L4, L5 For cemented lens made of being engaged with bonding agent.1st~the 6th lens L1~L6 is formed by glass.In the 3rd lens L3 and the 4th Diaphragm (aperture diaphragm) ST is configured between lens L4.Configured with appropriate between the 6th lens L6 and solid-state image pickup element 51 The optical filter F1 of thickness.

Fig. 6 (B)~6 (D) shows aberration diagram (spherical aberration, astigmatism and abnormal of the photographing optical system 10E of embodiment 5 Become).

(embodiment 6)

By the overall specifications of the photographing optical system of embodiment 6 described below.

F=5.18 (mm)

Fno=1.60

(2w=120.00 °)

ENTP=5.17 (mm)

EXTP=-5.86 (mm)

The data of the lens face of the photographing optical system of embodiment 6 are shown in table 16 below.

(table 16)

The asphericity coefficient of the lens face of embodiment 6 is shown in table 17 below.

(table 17)

3rd face

K=4.813686E-01, A4=-1.475065E-03, A6=-2.003896E-04,

A8=0.000000E+00, A10=0.000000E+00

4th face

K=-2.362824E-01, A4=2.391717E-04, A6=-3.831023E-04,

A8=0.000000E+00, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-4.221206E-03, A6=1.592116E-04,

A8=4.528629E-06, A10=0.000000E+00

13rd face

K=0.000000E+00, A4=-7.286229E-03, A6=2.157199E-04,

A8=0.000000E+00, A10=0.000000E+00

The simple lens data of embodiment 6 are shown in table 18 below.

(table 18)

Fig. 7 (A) is the sectional view of photographing optical system 10F of embodiment 6 etc..Photographing optical system 10F has: having negative Refractive power and object side in convex curved month type the 1st lens L1, with negative refractive power and object side be in convex bent moon 2nd lens L2 of type, with positive refractive power and in the 3rd lens L3 of biconvex, with negative refractive power and in object side in convex Curved month type the 4th lens L4, with positive refractive power and in biconvex the 5th lens L5, with negative refractive power and in object Side is in the 6th lens L6 of recessed curved month type.1st, the 3rd~the 5th lens L1, L3~L5 has spherical surface as optical surface.2nd and 6th lens L2, L6 has aspherical as optical surface.4th and the 5th lens L4, L5 is engagement made of being engaged with bonding agent Lens.1st~the 6th lens L1~L6 is formed by glass.Diaphragm (aperture is configured between the 3rd lens L3 and the 4th lens L4 Diaphragm) ST.The optical filter F1 of thickness appropriate is configured between the 6th lens L6 and solid-state image pickup element 51.

Fig. 7 (B)~7 (D) shows aberration diagram (spherical aberration, astigmatism and abnormal of the photographing optical system 10F of embodiment 6 Become).

(embodiment 7)

By the overall specifications of the photographing optical system of embodiment 7 described below.

F=5.05 (mm)

Fno=1.60

(2w=120.00 °)

ENTP=4.88 (mm)

EXTP=-5.62 (mm)

The data of the lens face of the photographing optical system of embodiment 7 are shown in table 19 below.

(table 19)

The asphericity coefficient of the lens face of embodiment 7 is shown in table 20 below.

(table 20)

3rd face

K=8.444764E-01, A4=-2.614988E-03, A6=-1.738652E-04,

A8=-5.218844E-06, A10=0.000000E+00

4th face

K=1.217372E-01, A4=-1.466915E-03, A6=-3.640626E-04,

A8=1.384098E-05, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-3.774998E-03, A6=3.237505E-04,

A8=-3.419817E-05, A10=1.583963E-06

13rd face

K=0.000000E+00, A4=-7.444015E-03, A6=3.210729E-04,

A8=-1.166117E-05, A10=2.547001E-07

The simple lens data of embodiment 7 are shown in table 21 below.

(table 21)

Fig. 8 (A) is the sectional view of photographing optical system 10G of embodiment 7 etc..Photographing optical system 10G has: having negative Refractive power and object side in convex curved month type the 1st lens L1, with negative refractive power and object side be in convex bent moon 2nd lens L2 of type, with positive refractive power and in the 3rd lens L3 of biconvex, with negative refractive power and in object side in convex Curved month type the 4th lens L4, with positive refractive power and in biconvex the 5th lens L5, with negative refractive power and in object Side is in the 6th lens L6 of recessed curved month type.1st, the 3rd~the 5th lens L1, L3~L5 has spherical surface as optical surface.2nd and 6th lens L2, L6 has aspherical as optical surface.4th and the 5th lens L4, L5 is engagement made of being engaged with bonding agent Lens.1st~the 6th lens L1~L6 is formed by glass.Diaphragm (aperture is configured between the 3rd lens L3 and the 4th lens L4 Diaphragm) ST.The optical filter F1 of thickness appropriate is configured between the 6th lens L6 and solid-state image pickup element 51.

Fig. 8 (B)~8 (D) shows aberration diagram (spherical aberration, astigmatism and abnormal of the photographing optical system 10G of embodiment 7 Become).

(embodiment 8)

By the overall specifications of the photographing optical system of embodiment 8 described below.

F=5.07 (mm)

Fno=1.60

(2w=120.00 °)

ENTP=5.19 (mm)

EXTP=-5.17 (mm)

The data of the lens face of the photographing optical system of embodiment 8 are shown in table 22 below.

(table 22)

The asphericity coefficient of the lens face of embodiment 8 is shown in table 23 below.

(table 23)

3rd face

K=6.235838E-01, A4=-2.071776E-03, A6=-2.321987E-04,

A8=0.000000E+00, A10=0.000000E+00

4th face

K=-6.841718E-01, A4=2.395688E-04, A6=-3.383195E-04,

A8=1.620589E-05, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-3.846583E-03, A6=0.000000E+00,

A8=0.000000E+00, A10=0.000000E+00

13rd face

K=0.000000E+00, A4=-7.189751E-03, A6=1.702006E-04,

A8=0.000000E+00, A10=0.000000E+00

The simple lens data of embodiment 8 are shown in table 24 below.

(table 24)

Fig. 9 (A) is the sectional view of photographing optical system 10H of embodiment 8 etc..Photographing optical system 10H has: having negative Refractive power and object side in convex curved month type the 1st lens L1, with negative refractive power and object side be in convex bent moon 2nd lens L2 of type, with positive refractive power and in the 3rd lens L3 of biconvex, with negative refractive power and in object side in convex Curved month type the 4th lens L4, with positive refractive power and in biconvex the 5th lens L5, with negative refractive power and in object Side is in the 6th lens L6 of recessed curved month type.1st, the 3rd~the 5th lens L1, L3~L5 has spherical surface as optical surface.2nd and 6th lens L2, L6 has aspherical as optical surface.4th and the 5th lens L4, L5 is engagement made of being engaged with bonding agent Lens.1st~the 6th lens L1~L6 is formed by glass.Diaphragm (aperture is configured between the 3rd lens L3 and the 4th lens L4 Diaphragm) ST.The optical filter F1 of thickness appropriate is configured between the 6th lens L6 and solid-state image pickup element 51.

Fig. 9 (B)~9 (D) shows aberration diagram (spherical aberration, astigmatism and abnormal of the photographing optical system 10H of embodiment 8 Become).

(embodiment 9)

By the overall specifications of the photographing optical system of embodiment 9 described below.

F=5.01 (mm)

Fno=1.60

(2w=160.00 °)

ENTP=4.82 (mm)

EXTP=-4.89 (mm)

The data of the lens face of the photographing optical system of embodiment 9 are shown in table 25 below.

(table 25)

The asphericity coefficient of the lens face of embodiment 9 is shown in table 26 below.

(table 26)

3rd face

K=6.507905E-01, A4=-2.343577E-03, A6=-2.230943E-04,

A8=0.000000E+00, A10=0.000000E+00

4th face

K=-3.111814E-01, A4=-5.469224E-04, A6=-4.670266E-04,

A8=2.277932E-05, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-4.771348E-03, A6=1.349028E-04,

A8=-9.672968E-06, A10=0.000000E+00

13rd face

K=0.000000E+00, A4=-7.175196E-03, A6=1.869686E-04,

A8=-2.115236E-06, A10=0.000000E+00

The simple lens data of embodiment 9 are shown in table 27 below.

(table 27)

Figure 10 (A) is the sectional view of photographing optical system 10I of embodiment 9 etc..Photographing optical system 10I has: having Negative refractive power and object side in the 1st lens L1 of convex curved month type, with negative refractive power and in object side in convex curved 2nd lens L2 of month type, it is in positive refractive power and in the 3rd lens L3 of biconvex, with negative refractive power and in object side 4th lens L4 of convex curved month type, with positive refractive power and in biconvex the 5th lens L5, with negative refractive power and in object Side is in the 6th lens L6 of recessed curved month type.1st, the 3rd~the 5th lens L1, L3~L5 has spherical surface as optical surface.2nd with And the 6th lens L2, L6 have it is aspherical be used as optical surface.4th and the 5th lens L4, L5 is to connect made of being engaged with bonding agent Close lens.1st~the 6th lens L1~L6 is formed by glass.Diaphragm (hole is configured between the 3rd lens L3 and the 4th lens L4 Diameter diaphragm) ST.The optical filter F1 of thickness appropriate is configured between the 6th lens L6 and solid-state image pickup element 51.

Figure 10 (B)~10 (D) show the photographing optical system 10I of embodiment 9 aberration diagram (spherical aberration, astigmatism and Distortion).

(embodiment 10)

By the overall specifications of the photographing optical system of embodiment 10 described below.

F=5.19 (mm)

Fno=1.60

(2w=120.00 °)

ENTP=5.36 (mm)

EXTP=-4.84 (mm)

The data of the lens face of the photographing optical system of embodiment 10 are shown in table 28 below.

(table 28)

The asphericity coefficient of the lens face of embodiment 10 is shown in table 29 below.

(table 29)

3rd face

K=5.069768E-01, A4=-2.315056E-03, A6=-1.674065E-04,

A8=0.000000E+00, A10=0.000000E+00

4th face

K=-2.548912E-01, A4=-2.033487E-03, A6=-4.422167E-04,

A8=0.000000E+00, A10=0.000000E+00

12nd face

K=0.000000E+00, A4=-6.354468E-03, A6=6.041170E-04,

A8=-7.952514E-05, A10=3.961534E-06

13rd face

K=0.000000E+00, A4=-8.577607E-03, A6=4.489956E-04,

A8=-2.473129E-05, A10=7.184231E-07

The simple lens data of embodiment 10 are shown in table 30 below.

(table 30)

Figure 11 (A) is the sectional view of photographing optical system 10J of embodiment 10 etc..Photographing optical system 10J has: having Negative refractive power and object side in the 1st lens L1 of convex curved month type, with negative refractive power and in object side in convex curved 2nd lens L2 of month type, it is in positive refractive power and in the 3rd lens L3 of biconvex, with negative refractive power and in object side 4th lens L4 of convex curved month type, with positive refractive power and in biconvex the 5th lens L5, with negative refractive power and in object Side is in the 6th lens L6 of recessed curved month type.1st, the 3rd~the 5th lens L1, L3~L5 has spherical surface as optical surface.2nd with And the 6th lens L2, L6 have it is aspherical be used as optical surface.4th and the 5th lens L4, L5 is to connect made of being engaged with bonding agent Close lens.1st~the 6th lens L1~L6 is formed by glass.Diaphragm (hole is configured between the 3rd lens L3 and the 4th lens L4 Diameter diaphragm) ST.The optical filter F1 of thickness appropriate is configured between the 6th lens L6 and solid-state image pickup element 51.

Figure 11 (B)~11 (D) show the photographing optical system 10J of embodiment 10 aberration diagram (spherical aberration, astigmatism and Distortion).

Table 31 below summarizes the value of each Examples 1 to 10 corresponding with each conditional (1)~(8), for reference.

(table 31)

More than, photographing optical system etc. is illustrated in conjunction with embodiment, but shooting optical system of the present invention System is not limited to above embodiment or embodiment, is able to carry out various modifications.

In addition, in the above-described embodiments, optical filter F1 can also using in-vehicle camera, supervision camera etc. use on the way Optical filter F1 is divided into 2 when being shot with visible light or near infrared light and it is made to be respectively provided with the knot of different effect etc. Structure.

Claims (15)

1. a kind of optical system,

Substantially successively include: from object side

The 1st lens with negative refractive power；

The 2nd lens with negative refractive power；

The 3rd lens with positive refractive power；

Diaphragm；

The 4th lens with negative refractive power；

The 5th lens with positive refractive power；And

6th lens,

The side of the object of 2nd lens has convex face shape,

The side of the object of 6th lens has recessed face shape,

Meet conditional below:

40≤νd3…(1)

Wherein,

ν d3 is the Abbe number of the 3rd lens.

2. optical system according to claim 1, wherein

Meet conditional below:

1.5<f123/f456…(2)

Wherein,

F123 is the synthesis focal length from the 1st lens to the 3rd lens,

F456 is the synthesis focal length from the 4th lens to the 6th lens.

3. optical system according to claim 1 or 2, wherein

Meet conditional below:

4.5<f123/f…(3)

Wherein,

F123 is the synthesis focal length from the 1st lens to the 3rd lens,

F is the focal length of whole system.

4. optical system described in any one of claim 1 to 3, wherein

Meet conditional below:

3.5<L/f<5.5…(4)

Wherein,

L is the overall length of whole system,

F is the focal length of whole system.

5. optical system according to any one of claims 1 to 4, wherein

Meet conditional below:

f2/f<-2.5…(5)

Wherein,

F2 is the focal length of the 2nd lens,

F is the focal length of whole system.

6. optical system according to any one of claims 1 to 5, wherein

6th lens have negative refractive power.

7. optical system described according to claim 1~any one of 6, wherein

Meet conditional below:

54≤νd1…(6)

Wherein,

ν d1 is the Abbe number of the 1st lens.

8. optical system according to any one of claims 1 to 7, wherein

Meet conditional below:

35≤νd6…(7)

Wherein,

ν d6 is the Abbe number of the 6th lens.

9. optical system described according to claim 1~any one of 8, wherein

Meet conditional below:

35<νd5-νd4…(8)

Wherein,

ν d4 is the Abbe number of the 4th lens,

ν d5 is the Abbe number of the 5th lens.

10. optical system described according to claim 1~any one of 9, wherein

1st lens have spherical shape.

11. optical system according to claim 10, wherein

At least one of 2nd lens and the 3rd lens with aspherical shape,

At least one of 4th lens, the 5th lens and the 6th lens are with aspherical shape.

12. optical system described in 0 or 11 according to claim 1, wherein

1st lens are glass lens.

13. optical system according to claim 12, wherein

2nd lens, the 3rd lens, the 4th lens, the 5th lens and the 6th lens are glass lens.

14. a kind of lens unit, has:

Optical system described in any one of claim 1~13；With

Keep the lens barrel of the optical system.

15. a kind of filming apparatus, has:

Optical system described in any one of claim 1~13；With

Detect the capturing element of the picture obtained from the optical system.