CN107728296A - Optical lens - Google Patents

Optical lens Download PDF

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Publication number
CN107728296A
CN107728296A CN201610650204.9A CN201610650204A CN107728296A CN 107728296 A CN107728296 A CN 107728296A CN 201610650204 A CN201610650204 A CN 201610650204A CN 107728296 A CN107728296 A CN 107728296A
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China
Prior art keywords
lens
diopter
lens group
optical lens
optical
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Granted
Application number
CN201610650204.9A
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Chinese (zh)
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CN107728296B (en
Inventor
赖圣棠
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Young Optics Inc
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Light Phenix Optical Co Ltd
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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
    • G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
    • 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

Abstract

A kind of optical lens, including the first lens group, the second lens group and the aperture between the first lens group and the second lens group.First lens group has a negative diopter and the number of lenses comprising tool diopter is less than 3, and number of lenses of second lens group with positive diopter and comprising tool diopter is less than 5 and second non-spherical lens of the lens group with diffraction face.Non-spherical lens with diffraction face is eligible：WhereinIt is respectively the diffraction face diopter with diffraction face lens, refraction diopter with V, with Abbe number.

Description

Optical lens
Technical field
A kind of present invention optical lens of confocal performance on tool diffraction element and day and night.
Background technology
The video camera of wired home monitoring in recent years has more and more booming trend, and people are for slimming and optics The requirement of performance also more and more higher.Meet the camera lens of such demand, generally need have low cost, large aperture, wide viewing angle, gently The features such as quantifying and be day and night confocal.Therefore, lightweight and day and night confocal can be taken into account by needing one kind badly at present, and can provide relatively low system Cause this and preferably the sampling image lens design of image quality.
The content of the invention
Other objects of the present invention and advantage can obtain further from the technical characteristic disclosed by the embodiment of the present invention Understanding.
One embodiment of the invention proposes a kind of optical lens, including the first lens group with negative diopter and with just in the wrong Second lens group of luminosity, the aperture being arranged between the first lens group and the second lens group, the first lens group and the second lens Group is sequentially set by a direction, wherein the number of lenses that the first lens group includes tool diopter is less than 3, the second lens group includes tool The number of lenses of diopter be less than 5 and second lens group include the lens in tool diffraction face and the lens in diffraction face meet following bar Part：
WhereinIt is respectively the diffraction face diopter with diffraction face lens, refraction diopter with V, with Abbe number.
Pass through the design of the embodiment of the present invention, it is possible to provide one kind can take into account lightweight and day and night confocal, and can provide relatively low Manufacturing cost and preferable image quality optical lens design.
Other objects of the present invention and advantage can from disclosed herein technical characteristic in be further understood. For the above and other objects, features and advantages of the present invention can be become apparent, special embodiment below simultaneously coordinates institute's accompanying drawing Formula, it is described in detail below.
Brief description of the drawings
Fig. 1 is the schematic diagram according to the optical lens 10a of one embodiment of the invention.
Fig. 2 to Fig. 5 is the image optics analogue data figure of Fig. 1 optical lens, and wherein Fig. 2~Fig. 3 is respectively visible ray With the light sector diagram of 850 nanometers of infrared lights, Fig. 4-Fig. 5 is respectively the diffraction optics of 587 nanometers of green glows and 850 nanometers of infrared lights Transfer curve figure.
Fig. 6 is the schematic diagram according to the optical lens 10b of another embodiment of the present invention.
Fig. 7 to Figure 10 is the image optics analogue data figure of Fig. 6 optical lens, and wherein Fig. 7~Fig. 8 is respectively visible ray With the light sector diagram of 850 nanometers of infrared lights, Fig. 9-Figure 10 is respectively the diffraction light of 587 nanometers of green glows and 850 nanometers of infrared lights Learn transfer curve figure.
Drawing reference numeral：
10a~10b optical lens
12 optical axises
14 apertures
16 glass covers
18 imaging planes
20 first lens groups
30 second lens groups
L1-L5 lens
S1-S13 surfaces
Embodiment
For the present invention foregoing and other technology contents, feature and effect, in the following embodiment coordinated with reference to schema Detailed description in, can clearly present.The direction term being previously mentioned in following examples, such as：It is upper and lower, left and right, preceding Or it is rear etc., only it is the direction with reference to annexed drawings.Therefore, the direction term used is intended to be illustrative and not intended to limit this hair It is bright.
Fig. 1 is schematic diagram of the display according to the optical lens 10a of one embodiment of the invention.Optical lens 10a is arranged at one and put Big side (Fig. 1 left side；For example, thing side) and a reduced side (Fig. 1 right side；For example, image side) between.As shown in figure 1, optics Camera lens 10a includes the first lens group (being, for example, pre-group) 20, the tool with negative diopter and between Zoom Side and reduced side There is positive diopter and the second lens group (be, for example, after group) 30 between the first lens group 20 and reduced side and positioned at the One aperture 14 of one lens group 20 and the Inter of the second lens group 30.Furthermore glass cover 16 and image sensing can be set in reduced side Device, imaging plane is denoted as 18 in optical lens 10a visible ray effective focal length, and glass cover 16 positioned at the second lens group 30 with In visible ray effective focal length between imaging plane 18.First lens group 20 can be included along optical lens 10a optical axis 12 from amplification Side is to the one first lens L1 and one second lens L2 of reduced side sequential, and the second lens group 30 can be included along optical lens One threeth lens L3, one fourth lens L4 and one fiveth lens L5 of the 10a optical axis 12 from Zoom Side to reduced side sequential, First lens L1 to the 5th lens L5 diopter is respectively negative, positive, positive and negative, just.In the present embodiment, the 4th lens L4 can To include the non-spherical lens in a diffraction face, the first lens L1, the second lens L2 and the 5th lens L5 are non-spherical lens, and the Three lens L3 are biconvex lens.In addition, the first lens L1 to the 5th lens L5 is separated each other two-by-two.In one embodiment, wherein There is identical radius of curvature on the adjacent two sides of two lens and forms balsaming lens, and the embodiment of the present invention is not limited thereto system.Light Camera lens 10a lens design parameters, profile, asphericity coefficient and diffraction face are learned respectively as shown in table one, table two and table three, Yu Ben In the following each design example of invention, aspherical multinomial can be represented with following equation：
In above-mentioned formula (1), Z is the offset (sag) of optical axis direction, and c is osculating sphere (osculating Sphere the inverse of radius), that is, the inverse close to the radius of curvature at optical axis, k are quadratic surface coefficient (conic), r It is aspherical height, as from lens centre toward the height of rims of the lens.The A-D of table two represents aspherical polynomial 4 respectively Rank item, 6 rank items, 8 rank items, 10 rank term system numerical value.
In following each design example of the invention, diffraction face multinomial can be represented with following equation：
φ (r)=(2 π/λ0)∑Cnr2n(2)；
In above-mentioned formula (2), φ (r) is the phase letter of diffraction element (diffractice optical element) Number (phase), r are and the radial distance of optical lens optical axis (radial distance), λ0It is reference wavelength (reference Wavelength), that is to say, that diffraction face (diffractice optical surface) is that lens surface adds phase function (phase).C1~C2 of table three represents the polynomial 2 rank item in diffraction face, 4 rank term system numerical value respectively.
Table one
S1 spacing is distances of surface S1 to the S2 in optical axis 12, S2 spacing be surface S2 to S3 optical axis 12 away from From, S13 spacing be glass cover S13 surfaces to imaging plane 18 in visible ray effective focal length optical axis 12 distance；
Visible ray effective focal length (EFL of visible light)=3.984mm；
Infrared light effective focal length (EFL of NIR 850nm light)=3.981mm；
F-number (F-Number)=2.0；
Maximum field of view angle (Max.field of view, FOV)=103.2 degree；
Maximum imaging circle (Max.Image Circle, IMA)=7.54mm of imaging plane in visible ray effective focal length；
Camera lens overall length (distance of imaging plane on total track length, TTL, S1 to visible ray effective focal length)= 23.5mm。
Table two
S1 S2 S3 S4
K 0 0 0 0
A 1.031E-03 -5.591E-04 -1.937E-03 -8.18E-05
B -8.090E-05 -1.908E-04 9.177E-06 3.206E-06
C 4.695E-06 -1.152E-05 -1.122E-05 4.662E-06
D -9.313E-08 -1.412E-06 1.830E-06 -2.115E-07
S8 S9 S10 S11
K 6.593E+00 -6.251E+00 -3.680E+00 2.024E+00
A -2.157E-03 -4.432E-03 -4.799E-03 4.021E-04
B 0 3.055E-04 1.797E-04 -4.327E-05
C 0 0 -1.512E-05 0
D 0 0 5.706E-07 0
Table three
S8
C1 -9.580E-04
C2 -3.751E-05
Fig. 2~Fig. 3 is respectively the light sector diagram (ray fan plot) of visible ray and 850 nanometers of infrared lights, wherein X-axis Position for light by entrance pupil, Y-axis are the relative value for the position that chief ray is projected to image plane (such as imaging plane 18). Fig. 4 to Fig. 5 is the present embodiment optical lens 10a image optics analogue data figure, and wherein Fig. 4~Fig. 5 is respectively 587 nanometers green The diffraction optics transfer curve figure of light and 850 nanometers of infrared lights (modulation transfer function, MTF), Both focal plane offsets are about 7 microns.It should be noted that the green of 555 nanometers of 587 nanometers of green glow substitution can also be used Light draws image optics analogue data figure.The figure gone out shown by Fig. 2~Fig. 5 analogue data figures in the range of standard, Thus can verify that the optical lens 10a of the present embodiment can actually have good optical imagery quality and day and night confocal spy concurrently Property.
It can be 2.0 that the optical lens of the present embodiment, which can include two lens groups and f-number, optical lens can include tool one around The a piece of non-spherical lens in face is penetrated to correct aberration and aberration.Furthermore following condition can be met：
20<V<60 (4)；
|(0.5*IMA)/(EFL*TAN(X))-1|<0.3 (5)；
TTL/IMA<3.3 (6)；
WhereinFor diffraction face S8 diopters, it is the C1/ (- 0.5) in table three,For non-spherical lens L4 refraction Diopter, V are non-spherical lens L4 Abbe number, and EFL is camera lens visible ray effective focal length, and IMA is in visible ray effective focal length The maximum imaging circle of imaging plane, X be maximum field of view angle 1/2, TTL be camera lens overall length (on S1 to visible ray effective focal length into The distance of image plane).Specifically, it is assumed that the optical lens of the present embodiment is designed to comply withNow around Penetrate that diopter is big, the number of turns of diffraction micro-structural is more, and manufacture difficulty is high.Furthermore if the optical lens of the present embodiment is designed to accord with Close | (0.5*IMA)/(EFL*TAN (X)) -1 |>0.3, then, it is seen that the deformation of image amount in light effective focal length on imaging plane is big. If the optical lens of the present embodiment is designed to comply with TTL/IMA>3.3, then camera lens volume is relatively large, unfavorable miniaturization.Cause This, the optical lens of the present embodiment is configured to conform to the condition of formula (3), (4), (5) and (6), can have concurrently optical lens good The low and day and night confocal characteristic of optical imagery quality well, manufacture difficulty.
Fig. 6 is schematic diagram of the display according to the optical lens 10b of another embodiment of the present invention.Optical lens 10b is arranged at one Zoom Side (Fig. 6 left side；For example, thing side) and a reduced side (Fig. 6 right side；For example, image side) between.As shown in fig. 6, light Learn camera lens 10b include the first lens group (for example, pre-group) 20 with negative diopter and positioned at Zoom Side and reduced side between, The second lens group (be, for example, after group) 30 with positive diopter and between the first lens group 20 and reduced side and it is located at One aperture 14 of the first lens group 20 and the Inter of the second lens group 30.Furthermore glass cover 16 and image sense can be set in reduced side Device is surveyed, imaging plane is denoted as 18 in optical lens 10b visible ray effective focal length, and glass cover 16 is located at the second lens group 30 Between imaging plane 18 in visible ray effective focal length.First lens group 20 can include the optical axis 12 along optical lens 10b from putting Big side is to the one first lens L1 and one second lens L2 of reduced side sequential, and the second lens group 30 can be included along optical frames One threeth lens L3, one fourth lens L4 and one fiveth lens of the head 10b optical axis 12 from Zoom Side to reduced side sequential L5, the first lens L1 to the 5th lens L5 diopter is respectively negative, positive, positive and negative, just.In the present embodiment, the 5th lens L5 Can be the non-spherical lens for including a diffraction face, the first lens L1, the second lens L2 and the 4th lens L4 are non-spherical lens, and 3rd lens L3 is biconvex lens.In addition, the first lens L1 to the 5th lens L5 is separated each other two-by-two.In one embodiment, its In the adjacent two sides of two lens have identical radius of curvature and form balsaming lens, the embodiment of the present invention is not limited thereto system. Optical lens 10b lens design parameters, profile, asphericity coefficient and diffraction face respectively as shown in table four, table five and table six, its The A-D of middle table five represents 4 rank items, 6 rank items, 8 rank items, the 10 rank term system numerical value of aspherical multinomial (as shown in Equation 1) respectively. C1~C2 of table six represents 2 rank items of diffraction face multinomial (as shown in Equation 2), 4 rank term system numerical value respectively.
Table four
S1 spacing is distances of surface S1 to the S2 in optical axis 12, S2 spacing be surface S2 to S3 optical axis 12 away from From, S13 spacing be glass cover S13 surfaces to imaging plane 18 optical axis 12 distance；
Visible ray effective focal length (EFL of visible light)=3.883mm；
Infrared light effective focal length (EFL of NIR 850nm light)=3.876mm；
F-number (F-Number)=2.0；
Maximum field of view angle (Max.field of view, FOV)=104.9 degree；
Maximum imaging circle (Max.Image circle, IMA)=7.54mm of imaging plane in visible ray effective focal length；
Camera lens overall length (distance of imaging plane on total track length, TTL, S1 to visible ray effective focal length)= 23.5mm。
Table five
S1 S2 S3 S4
K 0 0 0 0
A 1.658E-03 -6.320E-04 -2.464E-03 -3.682E-04
B -7.884E-05 -8.546E-05 4.376E-05 1.835E-05
C 3.126E-06 -5.632E-06 -6.879E-06 3.135E-06
D -5.407E-08 -1.236E-06 1.078E-06 -1.587E-07
S8 S9 S10 S11
K 1.692E+01 -7.793E+00 -4.575E+00 2.006E+00
A -3.103E-03 -3.109E-03 -4.439E-03 -3.899E-04
B 0 4.067E-04 2.971E-04 -1.406E-05
C 0 0 -1.504E-05 0
D 0 0 7.472E-07 0
Table six
S11
C1 -1.048E-03
C2 4.038E-06
Fig. 7~Fig. 8 is respectively the light sector diagram (ray fan plot) of visible ray and 850 nanometers of infrared lights, wherein X-axis Position for light by entrance pupil, Y-axis are the relative value for the position that chief ray is projected to image plane (such as imaging plane 18). Fig. 9 to Figure 10 is the present embodiment optical lens 10b image optics analogue data figure, and wherein Fig. 9~Figure 10 is respectively 587 nanometers The diffraction optics transfer curve figure of green glow and 850 nanometers of infrared lights (modulation transfer function, MTF), both focal plane offsets are about 1 micron.It should be noted that 555 nanometers of green glow substitution 587 can also be used to receive The green glow of rice draws image optics analogue data figure.The figure gone out shown by Fig. 7~Figure 10 analogue data figures is in standard In the range of, thus can verify that the optical lens 10b of the present embodiment can actually have good optical imagery quality concurrently and day and night be total to Burnt characteristic.
It can be 2.0 that the optical lens of the present embodiment, which can include two lens groups and f-number, optical lens can include tool one around The a piece of non-spherical lens in face is penetrated to correct aberration and aberration.Furthermore following condition can be met：
20<V<60 (4)；
|(0.5*IMA)/(EFL*TAN(X))-1|<0.3 (5)；
TTL/IMA<3.3 (6)；
WhereinFor diffraction face S11 diopters, it is the C1/ (- 0.5) in table six,For non-spherical lens L5 refraction Diopter, V are non-spherical lens L5 Abbe number, and EFL is camera lens visible ray effective focal length, and IMA is in visible ray effective focal length The maximum imaging circle of imaging plane, X be maximum field of view angle 1/2, TTL be camera lens overall length (on S1 to visible ray effective focal length into The distance of image plane).Specifically, it is assumed that the optical lens of the present embodiment is designed to comply withNow around Penetrate that diopter is big, the number of turns of diffraction micro-structural is more, and manufacture difficulty is high.Furthermore if the optical lens of the present embodiment is designed to accord with Close | (0.5*IMA)/(EFL*TAN (X)) -1 |>0.3, then, it is seen that the deformation of image amount on light effective focal length imaging plane is big.If The optical lens of the present embodiment is designed to comply with TTL/IMA>3.3, then camera lens volume is relatively large, unfavorable miniaturization.Therefore, The optical lens of the present embodiment is configured to conform to the condition of formula (4), (5), (6) and (7), can have concurrently optical lens good The low and day and night confocal characteristic of optical imagery quality, manufacture difficulty.
Pass through embodiment 10a and 10b design, it is possible to provide a kind of to take into account lightweight and day and night confocal characteristic, and energy Relatively low manufacturing cost and the sampling image lens design of preferable image quality are provided, furthermore, the angle of visual field of the embodiment of the present invention can Between 80 degree to 110 degree.
Although the present invention is disclosed above with preferred embodiment, so it is not limited to the present invention, any this area skill Art personnel, without departing from the spirit and scope of the present invention, when can make a little change and retouching, therefore the protection model of the present invention Enclose to work as and be defined depending on claim.In addition, any embodiment or claim of the present invention be not necessary to reach disclosed herein Whole purposes or advantage or feature.In addition, summary part and title are intended merely to aid in patent document search to be used, not use To limit the interest field of the present invention.

Claims (10)

  1. A kind of 1. optical lens, it is characterised in that including：
    One the first lens group and second lens group with positive diopter with negative diopter；
    One aperture, it is arranged between first lens group and second lens group, wherein first lens group includes tool diopter Number of lenses be less than 3, second lens group include tool diopter number of lenses be less than 5 and second lens group include one tool There are the lens in a diffraction face；And
    There are the lens in the diffraction face to meet following condition for this：
    WhereinIt is respectively that this has the diffraction face diopter of the diffraction face lens, refraction diopter with V, with Abbe Number.
  2. A kind of 2. optical lens, it is characterised in that including：
    One has the first lens group of negative diopter, includes two lens；
    One has the second lens group of positive diopter, and comprising three lens, and a wherein lens include a diffraction face, and this is first saturating Lens group is sequentially set with second lens group by a thing side a to image side；
    One aperture, it is arranged between first lens group and second lens group；And
    The optical lens meets following condition：
    |(0.5*IMA)/(EFL*TAN(X))-1|<0.3；
    Wherein, EFL is the optical lens visible ray effective focal length, and IMA is that imaging is flat in the optical lens visible ray effective focal length The maximum imaging circle in face, X is the 1/2 of the optical lens maximum field of view angle.
  3. A kind of 3. optical lens, it is characterised in that including：
    One has the first lens group of negative diopter, and the number of lenses that first lens group includes tool diopter is less than 3；
    One has the second lens group of positive diopter, the number of lenses that second lens group includes tool diopter be less than 5 and this Two lens groups include a lens with a diffraction face；
    One aperture, it is arranged between first lens group and second lens group；And
    The optical lens meets following condition：
    TTL/IMA<3.3；
    Wherein TTL is the optical lens overall length, and IMA is the maximum imaging of imaging plane in the optical lens visible ray effective focal length Circle.
  4. 4. the optical lens as described in any in claims 1 to 3, it is characterised in that have the diffraction face the lens meet under Row condition：
    20<V<60。
  5. 5. the optical lens as described in any in claims 1 to 3, it is characterised in that first lens group has negative diopter And non-spherical lens and the non-spherical lens of the negative diopter of a tool including a tool positive diopter.
  6. 6. the optical lens as described in any in claims 1 to 3, it is characterised in that second lens group has positive diopter And non-spherical lens and the non-spherical lens of the negative diopter of a tool including a tool positive diopter.
  7. 7. the optical lens as described in any in claims 1 to 3, it is characterised in that the lens are non-spherical lens.
  8. 8. the optical lens as described in any in claims 1 to 3, it is characterised in that second lens group is near the aperture Lens be a spherical lens.
  9. 9. optical lens as claimed in claim 8, it is characterised in that the spherical lens meets following condition：
    V>70。
  10. 10. the optical lens as described in any in claims 1 to 3, it is characterised in that the optical lens meets following condition： If using 555 nanometers or 587 nanometers of green glows by a focal plane of the optical lens as measuring basis, the optical lens can meet 850 nanometers of infrared lights are less than 8 microns in the focal plane displacement, from the measuring basis.
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TWI684805B (en) * 2018-03-28 2020-02-11 先進光電科技股份有限公司 Optical image capturing system

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TWI684805B (en) * 2018-03-28 2020-02-11 先進光電科技股份有限公司 Optical image capturing system

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