CN114153049B - Fixed-focus radiation-proof lens - Google Patents
Fixed-focus radiation-proof lens Download PDFInfo
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- CN114153049B CN114153049B CN202111480527.5A CN202111480527A CN114153049B CN 114153049 B CN114153049 B CN 114153049B CN 202111480527 A CN202111480527 A CN 202111480527A CN 114153049 B CN114153049 B CN 114153049B
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- 230000005855 radiation Effects 0.000 claims abstract description 59
- 239000011521 glass Substances 0.000 claims abstract description 30
- 239000006185 dispersion Substances 0.000 claims description 26
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 7
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 7
- 108700041286 delta Proteins 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 abstract description 20
- 238000002834 transmittance Methods 0.000 abstract description 12
- 150000002500 ions Chemical class 0.000 abstract description 11
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 7
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 229910052684 Cerium Inorganic materials 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000005304 optical glass Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- -1 cerium ion Chemical class 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
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- 238000003860 storage Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000005260 alpha ray Effects 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
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005250 beta ray Effects 0.000 description 1
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- 229910052796 boron Inorganic materials 0.000 description 1
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- 239000011575 calcium Substances 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
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- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
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- 229910052700 potassium Inorganic materials 0.000 description 1
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- 229910052710 silicon Inorganic materials 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
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a fixed-focus radiation-proof lens, which comprises a first lens group, a second lens group and a third lens group, wherein the focal length of the first lens group is A, the focal length of the second lens group is B, and the focal length of the third lens group is C, wherein the A is a fixed value, and then the numerical values of B and C satisfy the following conditions: 0.4A < B < 0.6A,0.15A < C < 0.2A. According to the invention, ce < 4+ > ions and lead are added into the glass, and the Ce < 4+ > ions capture negative ions e < - > generated by ionization when the glass is irradiated by high-energy rays such as gamma rays, so that the decrease of the transmittance caused by the generation of color centers in the glass is prevented, the metal lead can shield X and gamma radiation, the optical lens has the light transmittance reduced by only 25% after being subjected to high-intensity irradiation, and compared with the conventional optical lens reduced by about 90%, the optical lens has a great progress, and the service life of the optical lens is greatly prolonged.
Description
Technical Field
The invention relates to the technical field of radiation protection lenses, in particular to a fixed-focus radiation protection lens.
Background
The optical lens is generally designed by adopting a plurality of pieces of optical glass according to optical characteristics, the optical glass is formed by mixing high-purity oxides of silicon, boron, sodium, potassium, zinc, magnesium, calcium, barium, lead and the like according to a specific formula and then melting the mixture at a high temperature, and the coloring of oxide color centers formed by positive holes and free electrons caused by nuclear radiation is realized in an irradiation environment.
In the prior art, under a nuclear radiation scene, the common lens is subjected to nuclear radiation, especially gamma radiation, and then the material of the lens is aged rapidly due to the reason of the material, the phenomenon is that the color center of an oxide is colored, the main specific exterior is the browning of the lens, namely, the original colorless and transparent material of the lens is changed into brown, the light transmittance reduction ratio reaches 90 percent after irradiation, and the service life of the optical lens is reduced.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, a fixed focus radiation protection lens is provided.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a fixed focus radiation protection camera lens, includes first lens group, second lens group and third lens group, the focus of first lens group is A, the focus of second lens group is B, the focus of third lens group is C, wherein A is the constant value, then the numerical value of B and C satisfies:
0.4A＜B＜0.6A，0.15A＜C＜0.2A；
the first lens group consists of a first lens, a second lens, a third lens and a fourth lens, the second lens group consists of a fifth lens, a sixth lens and a seventh lens, and the third lens group consists of an eighth lens and a ninth lens;
the first lens and the eighth lens adopt ZF type glass, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the ninth lens adopt HS type glass, the ZF type comprises cerium oxide with the weight percentage of delta 1 and Pb with the weight percentage of lambda 1, the HS type comprises cerium oxide with the weight percentage of delta 2 and Pb with the weight percentage of lambda 2, the numerical range of delta 1 is 0.1-0.5%, the numerical range of lambda 1 is 4-8%, the numerical range of delta 2 is 2-4%, and the numerical range of lambda 2 is 0.1-0.3%.
As a further description of the above technical solution:
the first lens is in a shape of a double-sided concave curved surface, the concave curved surface is an arc-shaped curved surface, the length of the first lens is a1, the width of the first lens is b1, the radius of the arc-shaped curved surface is r1, wherein 5A1 is more than b1 and less than 7a1, r1=3pi a1, and 0.04A is more than a1 and less than 0.05A;
one side of the second lens is in a convex curved surface shape, the other side of the second lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc-shaped curved surfaces, the length of the second lens is a2, the width of the second lens is b2, the radius of the convex curved surface of the second lens is r21, the radius of the concave curved surface of the second lens is r22, b1 is more than b2 and less than 1.2b1,4a2 is more than b2 and less than 5a2, r21=3pi a2, and r22=0.8r21;
one side of the third lens is in a convex curved surface shape, the convex curved surface is an arc curved surface, the length of the third lens is a3, the width of the third lens is b3, the radius of the convex curved surface is r3, b1 is more than b3 and less than 1.1b1,9a3 is more than b3 and less than 11a3, and r3=3pi a3;
one side of the fourth lens is in a convex curved surface shape, the other side of the fourth lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc-shaped curved surfaces, the length of the fourth lens is a4, the width of the fourth lens is b4, the radius of the convex curved surface is r41, the radius of the concave curved surface is r42, b1 is more than b4 and less than 1.2b1, 10a4 is more than b4 and less than 12a4, r41=3pi a4, and r42=0.9r41.
As a further description of the above technical solution:
the fifth lens is in a shape of a double-sided concave curved surface, the concave curved surface is an arc-shaped curved surface, the length of the fifth lens is a5, the width of the fifth lens is b5, the radius of the arc-shaped curved surface is r5, b1 is more than b5 and less than 1.1b1,5a5 is more than b5 and less than 7a5, and r5=3pi a5;
the sixth lens is in a shape of a double-sided convex curved surface, the convex curved surface of the sixth lens is an arc-shaped curved surface, the length of the sixth lens is 0, the width of the sixth lens is b6, the radius of the arc-shaped curved surface is r6, b1 is more than b6 and less than 1.1b1, and r6=0.5pi b6;
the seventh lens is in a shape of a double-sided convex curved surface, the convex curved surface of the seventh lens is an arc-shaped curved surface, the length of the seventh lens is a7, the width of the seventh lens is b7, and the radius of the arc-shaped curved surface is r7, wherein b1 is more than b7 and less than 1.1b1,6a7 is more than b7 and less than 8a7, and r7=3pi a7.
As a further description of the above technical solution:
one side of the eighth lens is in a convex curved surface shape, the other side of the eighth lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are arc-shaped curved surfaces, the length of the eighth lens is a8, the width of the eighth lens is b8, the radius of the convex curved surface is r81, the radius of the concave curved surface is r82, b1 is more than b8 and less than 1.2b1,3a8 is more than b8 and less than 4a8, r81=3pi a8, and r82=0.7r81.
As a further description of the above technical solution:
one side of the ninth lens is in a convex curved surface shape, the other side of the ninth lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are arc-shaped curved surfaces, the length of the ninth lens is a9, the width of the ninth lens is b9, the radius of the convex curved surface is r91, the radius of the concave curved surface is r92, b1 is more than b9 and less than 1.2b1,8a9 is more than b9 and less than 10a9, r91=3pi a9, and r92=0.9r91.
As a further description of the above technical solution:
the refractive index of the first lens is Nd1, nd1 is more than 1.7 and less than 1.9, the dispersion coefficient is Vd1, and Vd1 is more than 20 and less than 30;
the refractive index of the second lens is Nd2, nd2 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd2, and Vd2 is more than 60 and less than 65;
the refractive index of the third lens is Nd3, nd3 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd3, and Vd3 is more than 60;
the refractive index of the fourth lens is Nd4, nd4 is more than 1.5 and less than 1.6, the dispersion coefficient is Vd4, and Vd4 is more than 55.
As a further description of the above technical solution:
the refractive index of the fifth lens is Nd5, nd5 is more than 1.7 and less than 1.9, the dispersion coefficient is Vd5, and Vd5 is more than 30 and less than 40.
As a further description of the above technical solution:
the refractive index of the sixth lens is Nd6, nd6 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd6, and Vd6 is more than 60.
As a further description of the above technical solution:
the refractive index of the seventh lens is Nd7, and Nd7 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd7, and Vd7 is more than 60;
the refractive index of the eighth lens is Nd8, nd8 is more than 1.7 and less than 1.9, the dispersion coefficient is Vd8, and Vd8 is more than 20 and less than 30.
As a further description of the above technical solution:
the refractive index of the ninth lens is Nd9, nd9 is more than 1.7 and less than 1.9, and the dispersion coefficient is Vd9 and Vd9 is more than 40.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. according to the invention, ce < 4+ > ions and lead are added into the glass, and the Ce < 4+ > ions capture negative ions e < - > generated by ionization when the glass is irradiated by high-energy rays such as gamma rays, so that the decrease of the transmittance caused by the generation of color centers in the glass is prevented, the metal lead can shield X and gamma radiation, the optical lens has the light transmittance reduced by only 25% after being subjected to high-intensity irradiation, and compared with the conventional optical lens reduced by about 90%, the optical lens has a great progress, and the service life of the optical lens is greatly prolonged.
2. In the invention, by limiting the size range and the positions of 9 lenses, the invention has the following advantages: direct projection lens does not need extra shielding and refraction, needs few materials, is simple in design, low in cost, fixed-focus in design and 35mm in focal length, and can cover large-angle large-aperture in design, and F=1.8.
Drawings
Fig. 1 shows an overall structure schematic diagram of a fixed-focus radiation protection lens provided according to an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a first lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a fourth lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 6 shows a schematic structural diagram of a fifth lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a sixth lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a seventh lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an eighth lens of the fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a ninth lens of the fixed focus radiation protection lens according to an embodiment of the present invention.
Legend description:
1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. a seventh lens; 8. an eighth lens; 9. and a ninth lens.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Returning to the problem itself, since the lens material rapidly ages and brown after the optical glass is subjected to the ionization effect of nuclear radiation, particularly gamma radiation, it is desirable to find a material that is resistant to the ionization effect.
Common photon nuclear radiation is alpha rays, beta rays and gamma rays, and common particle radiation is neutron radiation and proton radiation. Alpha ray ionization is not strong, even can not penetrate a piece of white paper, beta ray ionization is slightly strong, but can not penetrate an aluminum plate with a few millimeters; gamma-ray ionization is determined by its energy, high energy gamma-rays can penetrate tens of centimeters of lead plates, and gamma-rays above 1MeV are quite dangerous. Essentially, neutron radiation ultimately has a strong ionization effect due to gamma rays derived from neutrons after impact with the atomic lattice of the glass. The energy of neutron radiation differs, as does the gamma rays derived therefrom. Another effect of neutron radiation is that some atoms, such as cobalt, tend to absorb excess neutrons as a source of gamma radiation. Similar atoms are also metallic zinc, iodine, and the like. Proton radiation is slightly better than neutron radiation because it does not allow other atoms to become the source of radiation, otherwise proton radiation is substantially equivalent to neutron radiation.
In the nuclear radiation environment, video monitoring needs to be performed on key areas, such as a nuclear island area, a nuclear fuel concentration area, a nuclear waste treatment area, a radioactive medical substance storage area, a nuclear weapon storage area, a high-energy nuclear physics research experiment area and an outer space high-energy nuclear area of a nuclear power station.
Referring to fig. 1-10, the present invention provides a technical solution: a fixed-focus radiation-proof lens comprises a first lens group, a second lens group and a third lens group, wherein the focal length of the first lens group is A, the focal length of the second lens group is B, and the focal length of the third lens group is C, wherein A is a fixed value, and then the numerical values of B and C satisfy the following conditions:
0.4A＜B＜0.6A，0.15A＜C＜0.2A；
the first lens group consists of a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4, the second lens group consists of a fifth lens 5, a sixth lens 6 and a seventh lens 7, and the third lens group consists of an eighth lens 8 and a ninth lens 9;
the first lens 1 and the eighth lens 8 are ZF-type glass, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the ninth lens 9 are HS-type glass, the ZF-type glass contains cerium oxide with the weight percentage of delta 1 and Pb with the weight percentage of lambda 1, the HS-type glass contains cerium oxide with the weight percentage of delta 2 and Pb with the weight percentage of lambda 2, the numerical range of delta 1 is 0.1-0.5%, the numerical range of lambda 1 is 4-8%, the numerical range of delta 2 is 2-4%, and the numerical range of lambda 2 is 0.1-0.3%.
| Glass model | Cerium oxide content wt% | Pb content wt% | Refractive index | Abbe number |
| ZF | 0.1-0.5 | 4-8 | 1.7-1.8 | 26-30 |
| HS | 2-4 | 0.1-0.3 | 1.4-1.5 | 60-70 |
The first lens 1 is in a shape of a double-sided concave curved surface, the concave curved surface is an arc-shaped curved surface, the length of the first lens 1 is a1, the width of the first lens 1 is b1, the radius of the arc-shaped curved surface is r1, wherein 5A1 is more than b1 and less than 7a1, r1=3pi a1, and 0.04A is more than a1 and less than 0.05A;
one side of the second lens 2 is in a convex curved surface shape, the other side of the second lens 2 is in a concave curved surface shape, the convex curved surface and the concave curved surface are arc-shaped curved surfaces, the length of the second lens 2 is a2, the width of the second lens is b2, the radius of the convex curved surface is r21, the radius of the concave curved surface is r22, b1 is more than b2 and less than 1.2b1,4a2 is more than b2 and less than 5a2, r21=3pi a2, and r22=0.8r21;
one side of the third lens 3 is in a convex curved surface shape, the convex curved surface is an arc curved surface, the length of the third lens 3 is a3, the width of the third lens is b3, the radius of the convex curved surface is r3, wherein b1 is more than b3 and less than 1.1b1,9a3 is more than b3 and less than 11a3, and r3=3pi a3;
one side of the fourth lens 4 is in a convex curved surface shape, the other side of the fourth lens 4 is in a concave curved surface shape, the convex curved surface and the concave curved surface are arc-shaped curved surfaces, the length of the fourth lens 4 is a4, the width of the fourth lens is b4, the radius of the convex curved surface is r41, the radius of the concave curved surface is r42, b1 is more than b4 and less than 1.2b1, 10a4 is more than b4 and less than 12a4, r41=3pi a4, and r42=0.9r41.
The fifth lens 5 is in a shape of a double-sided concave curved surface, the concave curved surface is an arc-shaped curved surface, the length of the fifth lens 5 is a5, the width of the fifth lens 5 is b5, the radius of the arc-shaped curved surface is r5, b1 is more than b5 and less than 1.1b1,5a5 is more than b5 and less than 7a5, and r5=3pi a5;
the sixth lens 6 is in a shape of a double-sided convex curved surface, the convex curved surface is an arc-shaped curved surface, the length of the sixth lens 6 is 0, the width of the sixth lens 6 is b6, the radius of the arc-shaped curved surface is r6, b1 is smaller than b6 and smaller than 1.1b1, and r6=0.5pi b6;
the seventh lens 7 is in a shape of a double-sided convex curved surface, the convex curved surface of the seventh lens 7 is an arc-shaped curved surface, the length of the seventh lens 7 is a7, the width of the seventh lens is b7, and the radius of the arc-shaped curved surface is r7, wherein b1 is more than b7 and less than 1.1b1,6a7 is more than b7 and less than 8a7, and r7=3pi a7.
One side of the eighth lens 8 is in a convex curved surface shape, the other side of the eighth lens 8 is in a concave curved surface shape, the convex curved surface and the concave curved surface are arc-shaped curved surfaces, the length of the eighth lens 8 is a8, the width of the eighth lens is b8, the radius of the convex curved surface is r81, the radius of the concave curved surface is r82, b1 is more than b8 and less than 1.2b1,3a8 is more than b8 and less than 4a8, r81=3pi a8, and r82=0.7r81.
One side of the ninth lens 9 is in a convex curved surface shape, the other side of the ninth lens 9 is in a concave curved surface shape, the convex curved surface and the concave curved surface are arc-shaped curved surfaces, the length of the ninth lens 9 is a9, the width of the ninth lens is b9, the radius of the convex curved surface is r91, the radius of the concave curved surface is r92, b1 is more than b9 and less than 1.2b1,8a9 is more than b9 and less than 10a9, r91=3pi a9, and r92=0.9r91.
The refractive index of the first lens 1 is Nd1, nd1 is more than 1.7 and less than 1.9, the dispersion coefficient is Vd1, and Vd1 is more than 20 and less than 30; the refractive index of the second lens 2 is Nd2, nd2 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd2, and Vd2 is more than 60 and less than 65; the refractive index of the third lens 3 is Nd3, nd3 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd3, and Vd3 is 60; the refractive index of the fourth lens 4 is Nd4, nd4 is more than 1.5 and less than 1.6, the dispersion coefficient is Vd4, and Vd4 is more than 55; the refractive index of the fifth lens 5 is Nd5, and 1.7 < Nd5 < 1.9, and the dispersion coefficient is Vd5, and 30 < Vd5 < 40.
The refractive index of the sixth lens 6 is Nd6, and Nd6 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd6, and Vd6 is more than 60; the refractive index of the seventh lens 7 is Nd7, and Nd7 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd7, and Vd7 is more than 60; the refractive index of the eighth lens 8 is Nd8, and 1.7 < Nd8 < 1.9, the dispersion coefficient is Vd8, and 20 < Vd8 < 30, the refractive index of the ninth lens 9 is Nd9, and 1.7 < Nd9 < 1.9, the dispersion coefficient is Vd9, and 40 < Vd9.
The cerium ion has a unique characteristic, cerium is abbreviated as Ce, the cerium ion is generally provided with 4 positive charges and written as Ce4+, and by introducing Ce4+ ions into glass, the cerium ion can capture negative ions e-generated by ionization of the glass when the glass is irradiated by high-energy rays such as gamma rays and the like, and prevent the glass from generating color centers and reducing the transmittance.
The reaction formula generated is: ce4++ e- > Ce3+. The larger the amount of Ce4+ introduced, the stronger the irradiation resistance of the glass.
Metallic lead can shield X and gamma radiation, and the internal mechanism is that the larger the atomic number of lead is, the larger the density is. In the X, gamma high-energy photon radiation process, lead can enable high energy to have higher probability and self interaction, so as to achieve the effect of radiation shielding. Of course many heavy elements have the effect of shielding radiation. Lead is a relatively common metal among heavy elements, and can also be directly added into optical glass. Note that lead is a non-environmentally friendly metal and can only be used in certain situations
In the design, 9 pieces of glass are needed in total, the module design of the glass is shown in fig. 1, the back focal distance is designed to be 14mm for matching the image sensor, light enters from the left, is converged on the surface of the image sensor on the right, and the serial numbers of the glass from left to right are respectively 1-9.
Considering that part of metals (such as cobalt and zinc) are excited to become radiation sources again in the nuclear radiation neutron radiation scene, the structural design scheme needs to be considered next after the optical design is completed. In the structural scheme, it is first necessary to determine what material is used to make the lens structural member. The lens structure has two purposes, namely, glass used on the first fixed optical lens; secondly, shading is carried out on external light, so that stray light is prevented from entering the lens. Considering that nuclear radiation can cause rapid aging on a high polymer material, the design specially selects stainless steel 304 alloy which has excellent performance and does not contain cobalt and zinc to manufacture a structural member.
In order to achieve that stray light enters the lens, namely, the external light is shielded, the inner surface of the stainless steel 304 alloy needs to be blackened in the design process. Blackening treatment is a technological means for making the alloy surface generate compact black oxide, so that light rays are not emitted on the alloy surface. The special oxidant for the optical lens is used for high-temperature treatment, and a compact oxide layer is generated on the metal surface in the treatment process, so that the effect of preventing light reflection is achieved.
Implementation principle and technical effects:
after lens design and fabrication, we performed 10 sets of experiments with gamma radiation from a Co60 radiation source at a dose rate of 1X 105rad/h, and after 100 hours of irradiation, the total dose reached 1X 107rad.
After the irradiation is finished, the imaging of the lens is still intact, and the transmittance of the lens is tested, and the contrast is as follows:
| transmittance before irradiation | Transmittance after irradiation | Light transmittance reduction ratio before and after |
|
| 1# | 95％ | 72％ | 24.21％ |
| 2# | 96％ | 71％ | 26.04％ |
| 3# | 95％ | 73％ | 23.16％ |
| 4# | 96％ | 71％ | 26.04％ |
| 5# | 95％ | 70％ | 26.32％ |
| 6# | 96％ | 70％ | 27.08％ |
| 7# | 95％ | 72％ | 24.21％ |
| 8# | 96％ | 73％ | 23.96％ |
| 9# | 95％ | 71％ | 25.26％ |
| 10# | 96％ | 73％ | 23.96％ |
The experiment proves that by adding Ce < 4+ > ions and lead into glass, the Ce < 4+ > ions capture negative ions e < - > generated by ionization when the glass is irradiated by high-energy rays such as gamma rays, so that the reduction of the transmittance caused by the generation of color centers in the glass is prevented, the metal lead can shield X and gamma radiation, and the higher the atomic number and the higher the density of the lead are, the higher the probability of the high energy interaction of the lead and the lead can be realized in the X and gamma high-energy photon radiation process, so that the effect of shielding radiation is achieved, the light transmittance of the optical lens is reduced by only 25 percent after the optical lens is subjected to high-intensity irradiation, and compared with the reduction of about 90 percent of the traditional optical lens, the optical lens has great progress, and the service life of the optical lens is greatly prolonged.
By defining the size range and position of the 9 lenses, the following advantages are achieved: direct projection lens does not need extra shielding and refraction, needs few materials, is simple in design, low in cost, fixed-focus in design and 35mm in focal length, and can cover large-angle large-aperture in design, wherein F=1.8.
The optical specifications of the fixed Jiao Nai irradiation lens are as follows:
| focal length | 35mm |
| Transmission band | 400～700nm |
| Diagonal image height | 21.6mm |
| F number | 1.8 |
| Maximum light-transmitting aperture | 65mm |
| TTL | 120mm |
| Number of |
9 |
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. The utility model provides a fixed focus radiation protection camera lens, its characterized in that comprises first lens group, second lens group and the third lens group that the object space was arranged in proper order to the image space, the focus of first lens group is A, the focus of second lens group is B, the focus of third lens group is C, wherein A is the constant value, then the numerical value of B and C satisfies:
0.4A＜B＜0.6A，0.15A＜C＜0.2A；
the first lens group consists of a first lens (1), a second lens (2), a third lens (3) and a fourth lens (4), the second lens group consists of a fifth lens (5), a sixth lens (6) and a seventh lens (7), and the third lens group consists of an eighth lens (8) and a ninth lens (9);
the first lens (1) is in a double-sided concave curved surface shape, the object side surface of the second lens (2) is in a concave curved surface shape, the image side surface of the second lens (2) is in a convex curved surface shape, the object side surface of the third lens (3) is in a convex curved surface shape, the image side surface of the third lens (3) is in a plane, the object side surface of the fourth lens (4) is in a concave curved surface shape, the image side surface of the fourth lens (4) is in a convex curved surface shape, the fifth lens (5) is in a double-sided concave curved surface shape, the sixth lens (6) is in a double-sided convex curved surface shape, the seventh lens (7) is in a double-sided convex curved surface shape, the object side surface of the eighth lens (8) is in a convex curved surface shape, the image side surface of the eighth lens (8) is in a concave curved surface shape, the object side surface of the ninth lens (9) is in a convex curved surface shape, and the image side surface of the ninth lens (9) is in a concave curved surface shape;
the first lens (1) and the eighth lens (8) adopt ZF type glass, the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7) and the ninth lens (9) adopt HS type glass, the ZF type glass contains cerium oxide with the weight percentage of delta 1 and Pb with the weight percentage of lambda 1, the HS type glass contains cerium oxide with the weight percentage of delta 2 and Pb with the weight percentage of lambda 2, the numerical range of delta 1 is 0.1-0.5%, the numerical range of lambda 1 is 4-8%, the numerical range of delta 2 is 2-4%, and the numerical range of lambda 2 is 0.1-0.3%.
2. The fixed focus radiation protection lens according to claim 1, wherein the first lens (1) is in a shape of a double-sided concave curved surface, the concave curved surface is an arc curved surface, the first lens (1) has a length of a1, a width of b1, and a radius of r1, wherein 5A1 < b1 < 7a1, r1=3pi a1, and 0.04A < a1 < 0.05A;
the object side surface of the second lens (2) is in a concave curved surface shape, the image side surface of the second lens (2) is in a convex curved surface shape, the convex curved surface and the concave curved surface are both arc-shaped curved surfaces, the length of the second lens (2) is a2, the width of the second lens is b2, the radius of the convex curved surface is r21, the radius of the concave curved surface is r22, b1 is more than b2 and less than 1.2b1,4a2 is more than b2 and less than 5a2, r21=3pi a2, and r22=0.8r21;
the object side surface of the third lens (3) is in a convex curved surface shape, the image side surface of the third lens (3) is a plane, the convex curved surface is an arc curved surface, the length of the third lens (3) is a3, the width of the third lens is b3, the radius of the convex curved surface is r3, b1 is more than b3 and less than 1.1b1,9a3 is more than b3 and less than 11a3, and r3=3pi a3;
the object side surface of the fourth lens (4) is in a concave curved surface shape, the image side surface of the fourth lens (4) is in a convex curved surface shape, the convex curved surface and the concave curved surface are both arc-shaped curved surfaces, the length of the fourth lens (4) is a4, the width of the fourth lens is b4, the radius of the convex curved surface is r41, the radius of the concave curved surface is r42, b1 is more than b4 and less than 1.2b1, b 10a4 is more than b4 and less than 12a4, r41=3pi a4, and r42=0.9r41.
3. A fixed focus radiation protection lens according to claim 2, characterized in that the fifth lens (5) is shaped as a double sided concave curved surface, the concave curved surface is an arc curved surface, the length of the fifth lens (5) is a5, the width is b5, the radius of the arc curved surface is r5, wherein b1 < b5 < 1.1b1,5a5 < b5 < 7a5, r5=3ρa5;
the sixth lens (6) is in a shape of a double-sided convex curved surface, the convex curved surface is an arc-shaped curved surface, the length of the sixth lens (6) is 0, the width of the sixth lens is b6, the radius of the arc-shaped curved surface is r6, b1 is more than b6 and less than 1.1b1, and r6=0.5pi b6;
the seventh lens (7) is in a shape of a double-sided convex curved surface, the convex curved surface of the seventh lens is an arc-shaped curved surface, the length of the seventh lens (7) is a7, the width of the seventh lens is b7, the radius of the arc-shaped curved surface is r7, b1 is more than b7 and less than 1.1b1,6a7 is more than b7 and less than 8a7, and r7=3pi a7.
4. A fixed focus radiation protection lens according to claim 3, wherein the object side surface of the eighth lens (8) is in a convex curved surface shape, the image side surface of the eighth lens (8) is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the eighth lens (8) is a8, the width is b8, the radius of the convex curved surface is r81, the radius of the concave curved surface is r82, b1 is less than b8 and less than 1.2b1,3a8 is less than b8 and less than 4a8, r81=3pi a8, and r82=0.7r81.
5. The fixed focus radiation protection lens of claim 4, wherein the object side surface of the ninth lens (9) is in a convex curved surface shape, the image side surface of the ninth lens (9) is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the ninth lens (9) is a9, the width is b9, the radius of the convex curved surface is r91, the radius of the concave curved surface is r92, wherein b1 < b9 < 1.2b1,8a9 < b9 < 10a9, r91=3pi a9, and r92=0.9r91.
6. The fixed focus radiation protection lens of claim 5 wherein the refractive index of said first lens (1) is Nd1 and 1.7 < Nd1 < 1.9, the dispersion coefficient is Vd1 and 20 < Vd1 < 30;
the refractive index of the second lens (2) is Nd2, nd2 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd2, and Vd2 is more than 60 and less than 65;
the refractive index of the third lens (3) is Nd3, nd3 is more than 1.5 and less than 1.65, the dispersion coefficient is Vd3, and Vd3 is more than 60;
the refractive index of the fourth lens (4) is Nd4, nd4 is more than 1.5 and less than 1.6, and the dispersion coefficient is Vd4 and Vd4 is more than 55 and less than Vd4.
7. The fixed focus radiation protection lens of claim 6 wherein said fifth lens (5) has a refractive index Nd5 and 1.7 < Nd5 < 1.9, and an abbe number Vd5 and 30 < Vd5 < 40.
8. A fixed focus radiation protection lens as claimed in claim 7, wherein the refractive index of the sixth lens element (6) is Nd6, and 1.5 < Nd6 <1.65, and the dispersion coefficient is Vd6, and 60< Vd6.
9. A fixed focus radiation protection lens as claimed in claim 8, wherein the refractive index of the seventh lens (7) is Nd7, and 1.5 < Nd7<1.65, and the dispersion coefficient is Vd7, and 60< Vd7;
the refractive index of the eighth lens (8) is Nd8, nd8 is more than 1.7 and less than 1.9, the dispersion coefficient is Vd8, and Vd8 is more than 20 and less than 30.
10. A fixed focus radiation protection lens as claimed in claim 9, wherein the refractive index of the ninth lens (9) is Nd9, and 1.7 < Nd9 < 1.9, and the dispersion coefficient is Vd9, and 40 < Vd9.
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