CN109001894A - It is a kind of it is small distortion, high-low temperature resistant tight shot - Google Patents
It is a kind of it is small distortion, high-low temperature resistant tight shot Download PDFInfo
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- CN109001894A CN109001894A CN201811226193.7A CN201811226193A CN109001894A CN 109001894 A CN109001894 A CN 109001894A CN 201811226193 A CN201811226193 A CN 201811226193A CN 109001894 A CN109001894 A CN 109001894A
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- 230000003287 optical effect Effects 0.000 claims abstract description 28
- 238000003384 imaging method Methods 0.000 claims abstract description 15
- 125000006850 spacer group Chemical group 0.000 claims description 13
- 239000000571 coke Substances 0.000 claims description 12
- 229910001374 Invar Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 238000002848 electrochemical method Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 2
- 235000015170 shellfish Nutrition 0.000 claims 1
- 230000004075 alteration Effects 0.000 abstract description 6
- 238000012937 correction Methods 0.000 abstract description 5
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- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000005321 cobalt glass Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
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- 238000010304 firing Methods 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- Physics & Mathematics (AREA)
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- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The present invention discloses the tight shot of the small distortion of one kind, high-low temperature resistant, is related to tight shot field.Tight shot includes the first lens, diaphragm, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, optical filter and imaging device, the light issued from object successively after the first lens, diaphragm, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens and optical filter, is imaged on an imaging device.Tight shot of the invention has excellent permeability, and has carried out aberration, chromatic aberration correction, solves the problems, such as the purple boundary of visible light wave range imaging.Full glass tight shot of the invention is when corresponding chip size is 1/2.9 inch, have the characteristics that distortion it is small, aperture is big, it is compact-sized, as plane chief ray incidence angles are small, it can also allow camera lens that can keep excellent performance, and good reliability under high/low temperature (- 40 DEG C to 105 DEG C) environment.
Description
Technical field
The present invention relates to tight shot fields, more particularly to a kind of small distortion, the tight shot of high-low temperature resistant.
Background technique
In recent years, in terms of safety-security area, requirement of the market to safety monitoring camera lens is higher and higher, for example imaging requirements are high
Clearly, disappear purple boundary, veiling glare be few, size require it is short and small, can adapt to harsh high and low temperature environment, waterproof Anti-scratching etc..Wherein,
The camera lens of focal length 8mm or so is widely used in various occasions because the range of its observation is more moderate.Existing large aperture,
The camera lens of focal length 8mm or so is to meet fine definition, low distortion etc. to require, and the number of lenses used is relatively more, causes camera lens knot
Structure is complicated, volume is big；To adapt to harsh high and low temperature environment, microscope base is formed using metal material processing, eyeglass using aspherical,
It is at high cost.
Summary of the invention
The object of the present invention is to provide a kind of small distortion, the tight shot of high-low temperature resistant, it is bigger than normal, no to solve optics overall length
The problem of adapting to harsh high and low temperature environment.
To achieve the above object, the present invention provides following schemes:
A kind of small distortion, high-low temperature resistant tight shot, comprising: the first lens, diaphragm, the second lens, the third lens, the
Four lens, the 5th lens, the 6th lens and optical filter.
It is saturating that the light issued from object passes sequentially through first lens, the diaphragm, second lens, the third
After mirror, the 4th lens, the 5th lens, the 6th lens and the optical filter, it is imaged on an imaging device.
First lens are the double concave glass lens with negative power.
Second lens are the lenticular glass lens with positive light coke.
The third lens are the lenticular glass lens with positive light coke.
4th lens are the double concave glass lens with negative power.
The exit facet of the third lens and the plane of incidence of the 4th lens are glued together.
5th lens are the falcate glass lens with positive light coke, and the plane of incidence of the 5th lens is described
The concave surface of falcate glass lens, the exit facet of the 5th lens are the convex surface of the falcate glass lens.
6th lens are the falcate glass lens with positive light coke, and the plane of incidence of the 6th lens is described
The convex surface of falcate glass lens, the exit facet of the 6th lens are the concave surface of the falcate glass lens.
Optionally, tight shot further include:
Lens barrel and end cap.
The end cap is arranged in described lens barrel one end, and the optical filter is glued at the other end of the lens barrel, and described first
Lens, the diaphragm, second lens, the third lens, the 4th lens, the 5th lens and the described 6th are thoroughly
Mirror is successively installed in the end cap, the lens barrel and the optical filter.
Optionally, tight shot further include: multiple spacer rings；
The spacer ring is separately positioned between first lens and the second lens, and second lens and the third are saturating
It is between the 5th lens and the 6th lens and described between the 4th lens and the 5th lens between mirror
Between end cap and the lens barrel.
Optionally, the spacer ring between first lens and the second lens uses invar alloy or super Invar alloy material
Material is processed into, then is surface-treated through electrochemical method.
Optionally, refractive index≤1.70 of first lens, Abbe number≤35 of first lens；
Refractive index >=1.90 of second lens, Abbe number≤40 of second lens；
Refractive index≤1.65 of the third lens, Abbe number >=60 of the third lens；
Refractive index >=1.80 of 4th lens, Abbe number≤30 of the 4th lens；
Refractive index >=1.75 of 5th lens, Abbe number≤50 of the 5th lens；
Refractive index >=1.80 of 6th lens, Abbe number≤45 of the 6th lens；
And difference >=0.20 of the refractive index of the refractive index of the 4th lens and the third lens, the third lens
Abbe number and the 4th lens Abbe number difference >=30.
Optionally, first lens be preceding group of lens, second lens, the third lens, the 4th lens,
Lens group is organized after 5th lens and the 6th lens composition.
Optionally, the ratio of the combined focal length of the focal length of the preceding group lens and the rear group lens group is greater than -1 and is less than
0。
Optionally, the optical filter is the optical module for passing through 436nm to the visible light of 656nm wave band.
The specific embodiment provided according to the present invention, the invention discloses following technical effects: the present invention provides a kind of small
It distorts, the tight shot of high-low temperature resistant, including the first lens, diaphragm, the second lens, the third lens, the 4th lens, the 5th are thoroughly
Mirror, the 6th lens, optical filter and imaging device, from object issue light successively pass through the first lens, diaphragm, the second lens,
After the third lens, the 4th lens, the 5th lens, the 6th lens and optical filter, it is imaged on an imaging device.Fixed-focus mirror of the invention
Head has excellent permeability, and has carried out aberration, chromatic aberration correction, solves the problems, such as the purple boundary of visible light wave range imaging.The present invention
Full glass tight shot when corresponding chip size is 1/2.9 inch, have distort small, aperture is big, it is compact-sized, as plane
The small feature of chief ray incidence angles can also allow camera lens that can keep excellent property under high/low temperature (- 40 DEG C to 105 DEG C) environment
Can, good reliability.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of the small distortion of the embodiment of the present invention, high-low temperature resistant tight shot；
Fig. 2 is the light path schematic diagram of the small distortion of the embodiment of the present invention, high-low temperature resistant tight shot；
Fig. 3 is the small distortion of the embodiment of the present invention, point range figure of the high-low temperature resistant tight shot at visible light 436-656nm；
Fig. 4 is the small distortion of the embodiment of the present invention, MTF of the high-low temperature resistant tight shot at visible light 436-656nm, 20 DEG C
Curve graph；
Fig. 5 is the small distortion of the embodiment of the present invention, the curvature of field of the high-low temperature resistant tight shot at visible light 436-656nm and abnormal
Become figure；
Fig. 6 is the small distortion of the embodiment of the present invention, relative illumination of the high-low temperature resistant tight shot at visible light 436-656nm
Curve graph；
Fig. 7 is the small distortion of the embodiment of the present invention, defocus MTF of the high-low temperature resistant tight shot at visible light 436-656nm
Curve graph；
Fig. 8 is the small distortion of the embodiment of the present invention, ratio chromatism, of the high-low temperature resistant tight shot at visible light 436-656nm
Curve graph；
Fig. 9 is the small distortion of the embodiment of the present invention, high-low temperature resistant tight shot at visible light 436-656nm, -40 DEG C
MTF curve figure；
Figure 10 is the small distortion of the embodiment of the present invention, high-low temperature resistant tight shot at visible light 436-656nm, 105 DEG C
MTF curve figure.
Wherein, the 1, first lens；2, diaphragm；3, the second lens；4, the third lens；5, the 4th lens；6, the 5th lens；7,
6th lens；8, optical filter.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is the structural schematic diagram of the small distortion of the embodiment of the present invention, high-low temperature resistant tight shot；Fig. 2 is that the present invention is implemented
Example it is small distortion, high-low temperature resistant tight shot light path schematic diagram.
Referring to Fig. 1 and Fig. 2, the small distortion of one kind provided in an embodiment of the present invention, high-low temperature resistant tight shot, comprising: the
One lens 1, diaphragm 2, the second lens 3, the third lens 4, the 4th lens 5, the 5th lens 6, the 6th lens 7 and optical filter 8.
The light issued from object passes sequentially through the first lens 1, diaphragm 2, the second lens 3, the third lens 4, the 4th lens
5, it after the 5th lens 6, the 6th lens 7 and optical filter 8, is imaged on an imaging device.
First lens 1 are the double concave glass lens with negative power.
Second lens 3 are the lenticular glass lens with positive light coke.
The third lens 4 are the lenticular glass lens with positive light coke.
4th lens 5 are the double concave glass lens with negative power.
The exit facet of the third lens 4 and the plane of incidence of the 4th lens 5 are glued together；
5th lens 6 are the falcate glass lens with positive light coke, and the plane of incidence of the 5th lens 6 is falcate glass
The concave surface of lens, the exit facet of the 5th lens 6 are the convex surface of falcate glass lens.
6th lens 7 are the falcate glass lens with positive light coke, and the plane of incidence of the 6th lens 7 is falcate glass
The convex surface of lens, the exit facet of the 6th lens 7 are the concave surface of falcate glass lens.
Preferably, tight shot provided in an embodiment of the present invention further include:
Lens barrel and end cap；End cap is arranged in lens barrel one end, and optical filter 8 is glued at the other end of lens barrel, the first lens 1, light
Late 2, second lens 3, the third lens 4, the 4th lens 5, the 5th lens 6 and the 6th lens 7 are successively installed on end cap, lens barrel and filter
In mating plate 8.
Preferably, tight shot provided in an embodiment of the present invention further include: multiple spacer rings；Spacer ring is separately positioned on first thoroughly
Between mirror 1 and the second lens 3, between the second lens 3 and the third lens 4, between the 4th lens 5 and the 5th lens 6, the 5th lens
6 and the 6th between lens 7 and between end cap and lens barrel, prevent eyeglass from colliding.
The spacer ring of first lens 1 and the second lens 3 uses invar alloy or super Invar alloy material to be processed into first, so
It is surface-treated by electrochemical method to reduce stray light.
Microscope base by thermal expansion coefficient 50 × 10^ (- 6)/DEG C or so material be made, the preferred glass fibre LCP of material
(LCP: enhancing polymeric liquid crystal copolymer) or polycarbonate (PC).Camera lens is arranged in pairs or groups microscope base, and can import 436nm to 656nm can
Light-exposed wave band is applied to safety monitoring and images, and when corresponding chip size is 1/2.9 inch, having small distortion, (distortion is lower than
1.6%), high-low temperature resistant (- 40 DEG C~105 DEG C), aperture big (F/#=1.8), compact-sized rationally (optics overall length Total
Track Length, TTL≤24mm), the purple boundary that disappears, as plane chief ray incidence angles (CRA, Chief Ray Angle) small (CRA
12.5 ° of <) the features such as.
First lens 1 are the double concave glass lens of low-refraction, high dispersion, and the one side of the first lens 1 towards object space is
Concave surface, the another side of the first lens 1 towards image space are also concave surface, the refractive index (nd1)≤1.70 of the first lens 1, Abbe number
(Vd1)≤35。
Second lens 3 are the lenticular glass lens of high refractive index, high dispersion, and the one side of the second lens 3 towards object space is
Convex surface, the another side of the second lens 3 towards image space are also convex surface, the refractive index (nd2) >=1.90 of the second lens 3, Abbe number
(Vd2)≤40。
The third lens 4 are the lenticular glass lens of low-refraction, low dispersion, and the one side of the third lens 4 towards object space is
Convex surface, the another side of the third lens 4 towards image space are also convex surface, the refractive index (nd3)≤1.65 of the third lens 4, Abbe number
(Vd3)≥60。
4th lens 5 are the double concave glass lens of high refractive index, high dispersion, and the one side of the 4th lens 5 towards object space is
Concave surface, the another side of the 4th lens 5 towards image space are also concave surface, the refractive index (nd4) >=1.80 of the 4th lens 5, Abbe number
(Vd4)≤30。
5th lens 6 are the falcate glass lens of high refractive index, high dispersion, and the one side of the 5th lens 6 towards object space is
Concave surface, the another side of the 5th lens 6 towards image space are convex surface, the refractive index (nd5) >=1.75 of the 5th lens 6, Abbe number (Vd5)
≤50。
6th lens 7 are the falcate glass lens of high refractive index, high dispersion, and the one side of the 6th lens 7 towards object space is
Convex surface, the another side of the 6th lens 7 towards image space are concave surface, the refractive index (nd6) >=1.80 of the 6th lens 7, Abbe number (Vd6)
≤45。
The third lens 4 and the 4th lens 5 carry out gluing, form the balsaming lens of negative power, and the third lens 4 are towards image space
Convex surface and the 4th lens 5 towards the concave surface of object space be cemented surface.The folding of refractive index (nd4) and the third lens 4 of 4th lens 5
Rate (nd3) is penetrated, difference range between the two is-nd3 >=0.20 nd4, the Abbe number (Vd3) and the 4th lens 5 of the third lens 4
Abbe number (Vd4), difference range between the two is-Vd4 >=30 Vd3.
Camera lens is divided into two groups of front and back using diaphragm as boundary by camera lens, wherein the first lens 1 be preceding group of lens, the second lens 3,
Lens group is organized after the third lens 4, the 4th lens 5, the 5th lens 6, the 6th lens 7 composition, the focal length of preceding group of lens is denoted as ff, after
The combined focal length of group lens group is denoted as fb, the focal length f of preceding group of lensfWith the combined focal length f of the rear group lens groupbRatio be-
1<fb/ff<0。
Optical filter 8 is cutoff filter or smalt, and the spectral reflectivity of the visible light wave range of optical filter 8 is low,
The cut-off of repercussions section.
Fig. 3 is the small distortion of the embodiment of the present invention, point range figure of the high-low temperature resistant tight shot at visible light 436-656nm.
Referring to Fig. 3, wavelength takes g light, F light, e light, five wavelength of d light and C light, and g light is the visible light of 436nm, and F light can for 486nm's
It is light-exposed, visible light of the e light for 546nm, visible light of the d light for 588nm, visible light of the C light for 656nm, weight ratio 3:7:10:
8:3.From the figure 3, it may be seen that the disc of confusion under each visual field compares concentration, it is distributed also relatively uniform.Meanwhile there is not some visual field
Under disc of confusion the phenomenon that separating to open very much up and down with wavelength, illustrate that purple boundary disappears preferably.6 lens are used only in the present invention,
Number of lenses is less, and lens construction is simple, small in size.
Tight shot of the invention is in terms of spectral transmittance, to g light (436nm), F light (486nm), e light (546nm), d
Five wavelength of light (588nm) and C light (656nm) have excellent permeability, and have carried out aberration, chromatic aberration correction, and solving can
The purple boundary problem of light-exposed wave band imaging.
Fig. 4 is the small distortion of the embodiment of the present invention, MTF of the high-low temperature resistant tight shot at visible light 436-656nm, 20 DEG C
(modulation transfer function: Modulation Transfer Function) curve graph.MTF curve figure represents an optical system
Comprehensive solution as horizontal, as shown in Figure 4, full filed mtf value >=0.2 150lp/mm at, imaging is than more visible.
Fig. 5 is the small distortion of the embodiment of the present invention, the curvature of field of the high-low temperature resistant tight shot at visible light 436-656nm and abnormal
Become figure.Distortion curve indicates conventional optical distortion (F-Tan (theta)) the distortion sizes values in the case of different field angles,
Unit is %.As seen from Figure 5, optical distortion is barrel distortion, absolute value≤1.60%.
Fig. 6 is the small distortion of the embodiment of the present invention, relative illumination of the high-low temperature resistant tight shot at visible light 436-656nm
Curve graph.It will be appreciated from fig. 6 that curve decline is smooth, angle value > 0.548 is contrasted under maximum field of view, imaging picture is brighter.
Fig. 7 is the small distortion of the embodiment of the present invention, defocus MTF of the high-low temperature resistant tight shot at visible light 436-656nm
Curve graph, that spatial frequency takes is 75lp/mm, and defocus range is -0.03mm to 0.03mm.Fig. 7 can reflect curvature of field correction
Degree, when there are the curvature of field for a system, as a result, center can not be synchronous clear with periphery, i.e., field of view center is adjusted to clearest
When, edge is but not clear enough；Need by readjustment reduce field of view center clarity come allow field of view edge more clearly.By Fig. 7
As it can be seen that the curvature of field of tight shot of the present invention correct it is preferable.
Fig. 8 is the small distortion of the embodiment of the present invention, ratio chromatism, of the high-low temperature resistant tight shot at visible light 436-656nm
Curve graph is known that the degree of ratio chromatism, correction by the size of Fig. 8 combination pixel particle.As shown in Figure 8, the present invention is fixed
The ratio chromatism, of zoom lens corrects preferably, and purple boundary has elimination.
Fig. 9 is the small distortion of the embodiment of the present invention, high-low temperature resistant tight shot at visible light 436-656nm, -40 DEG C
MTF curve figure, Figure 10 are the small distortion of the embodiment of the present invention, high-low temperature resistant tight shot visible light 436-656nm, at 105 DEG C
MTF curve figure.Wherein, the thermal expansion coefficient of microscope base be set as 50 × 10^ (- 6)/DEG C, between the first lens 1 and the second lens 3
The thermal expansion coefficient of spacer ring be set as 0.9 × 10^ (- 6)/DEG C, the thermal expansion coefficient of lens barrel and other spacer rings be set as 23.2 × 10^ (-
6)/℃.By Fig. 9, Figure 10 it is found that under high and low temperature environment the mtf value of 150lp/mm full filed substantially >=0.2, clarity ratio
It is more stable.
In case study on implementation of the present invention, by object space side, by each mirror surface number consecutively, the first lens 1 are towards object space
Concave surface be R1, concave surface R2 of first lens 1 towards image space, the serial number Stop of 2 aperture diaphragm of diaphragm, the second lens 3 are towards object
Side convex surface be R4, the second lens 3 towards the convex surface of image space be R5, the third lens 4 towards the convex surface of object space be R6, the third lens
4 and the 4th the cemented surfaces of lens 5 be R7, the 4th lens 5 are R8 towards the concave surface of image space, and the 5th lens 6 are towards the concave surface of object space
For R9, the 5th lens 6 towards the convex surface of image space be R10, the 6th lens 7 towards the convex surface of object space be R11,7 direction of the 6th lens
The concave surface of image space be R12, optical filter 8 towards one face of object space be 13, optical filter 8 towards one face of image space be 14, image sensing
Device surface protection glass towards one face of object space be 15, image sensor surface protect glass towards one face of image space be 16.IMA
The final picture plane Image Plane indicated, that is, the receiving plane of imaging sensor.
Preferred parameter value of the present invention is as follows:
EFL=8.16mm, FNO=1.8, FOV=42 °, TTL=24.00mm, CRA≤11.21 °, wherein EFL is optics
The whole focal length value of camera lens, FNO are f-number, and FOV is field angle, and TTL is lens optical overall length, and CRA is that image planes chief ray enters
Firing angle.Photosensitive imaging chip is the OV2718 of OmniVision, unit: mm.
1 lens parameters sample table of table
Spacer ring between first lens and the second lens is process using super Invar alloy 4J32, then with electrochemistry side
Method is surface-treated；Lens barrel and remaining spacer ring are process using metallic aluminium, then anodic oxidation blackening process；The mirror of collocation
Seat is process using glass fiber reinforcement LCP or PC, is subtracted and is reduced costs.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (8)
1. the tight shot of a kind of small distortion, high-low temperature resistant characterized by comprising the first lens, diaphragm, the second lens, the
Three lens, the 4th lens, the 5th lens, the 6th lens and optical filter；
From object issue light pass sequentially through first lens, the diaphragm, second lens, the third lens,
After 4th lens, the 5th lens, the 6th lens and the optical filter, it is imaged on an imaging device；
First lens are the double concave glass lens with negative power；
Second lens are the lenticular glass lens with positive light coke；
The third lens are the lenticular glass lens with positive light coke；
4th lens are the double concave glass lens with negative power；
The exit facet of the third lens and the plane of incidence of the 4th lens are glued together；
5th lens are the falcate glass lens with positive light coke, and the plane of incidence of the 5th lens is the bent moon
The concave surface of shape glass lens, the exit facet of the 5th lens are the convex surface of the falcate glass lens；
6th lens are the falcate glass lens with positive light coke, and the plane of incidence of the 6th lens is the bent moon
The convex surface of shape glass lens, the exit facet of the 6th lens are the concave surface of the falcate glass lens.
2. tight shot according to claim 1, which is characterized in that further include:
Lens barrel and end cap；
The end cap is arranged in described lens barrel one end, and the optical filter is glued at the other end of the lens barrel, first lens,
The diaphragm, second lens, the third lens, the 4th lens, the 5th lens and the 6th lens according to
It is secondary to be installed in the end cap, the lens barrel and the optical filter.
3. tight shot according to claim 2, which is characterized in that further include: multiple spacer rings；
The spacer ring is separately positioned between first lens and the second lens, second lens and the third lens it
Between, between the 4th lens and the 5th lens, between the 5th lens and the 6th lens and the end cap
Between the lens barrel.
4. tight shot according to claim 3, which is characterized in that described between first lens and the second lens
Spacer ring is processed into using invar alloy or super Invar alloy material, then is surface-treated through electrochemical method.
5. tight shot according to claim 1, which is characterized in that
Refractive index≤1.70 of first lens, Abbe number≤35 of first lens；
Refractive index >=1.90 of second lens, Abbe number≤40 of second lens；
Refractive index≤1.65 of the third lens, Abbe number >=60 of the third lens；
Refractive index >=1.80 of 4th lens, Abbe number≤30 of the 4th lens；
Refractive index >=1.75 of 5th lens, Abbe number≤50 of the 5th lens；
Refractive index >=1.80 of 6th lens, Abbe number≤45 of the 6th lens；
And difference >=0.20 of the refractive index of the refractive index of the 4th lens and the third lens, the third lens Ah
Difference >=30 of the Abbe number of shellfish number and the 4th lens.
6. tight shot according to claim 1, which is characterized in that first lens be preceding group of lens, described second
Lens group is organized after lens, the third lens, the 4th lens, the 5th lens and the 6th lens composition.
7. tight shot according to claim 6, which is characterized in that the focal length of group lens and the rear group lens before described
The ratio of the combined focal length of group is greater than -1 and less than 0.
8. tight shot according to claim 1, which is characterized in that the optical filter is to make 436nm to 656nm wave band
The optical module that visible light passes through.
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| CN116299982A (en) * | 2023-05-11 | 2023-06-23 | 宁波永新光学股份有限公司 | Long-focus receiving optical system of low-temperature drift laser radar |
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