CN109270602B - Composite coating layer, lens barrel, lens and shooting equipment - Google Patents
Composite coating layer, lens barrel, lens and shooting equipment Download PDFInfo
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- CN109270602B CN109270602B CN201811523058.9A CN201811523058A CN109270602B CN 109270602 B CN109270602 B CN 109270602B CN 201811523058 A CN201811523058 A CN 201811523058A CN 109270602 B CN109270602 B CN 109270602B
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- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 239000011247 coating layer Substances 0.000 title claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 122
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 61
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 59
- AZCUJQOIQYJWQJ-UHFFFAOYSA-N oxygen(2-) titanium(4+) trihydrate Chemical compound [O-2].[O-2].[Ti+4].O.O.O AZCUJQOIQYJWQJ-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000010410 layer Substances 0.000 claims description 423
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims 1
- 230000000694 effects Effects 0.000 description 17
- 238000003384 imaging method Methods 0.000 description 15
- 230000004313 glare Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 238000002310 reflectometry Methods 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 7
- 238000000576 coating method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000031700 light absorption Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 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 2
- 239000006229 carbon black Substances 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 230000003238 somatosensory effect Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- 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
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/113—Anti-reflection coatings using inorganic layer materials only
- G02B1/115—Multilayers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Optics & Photonics (AREA)
- Surface Treatment Of Optical Elements (AREA)
Abstract
The invention discloses a composite coating layer, a lens barrel, a lens and shooting equipment, wherein the composite coating layer comprises eleven coating layers formed by combining a silicon dioxide coating layer, a titanium pentoxide coating layer, a silicon dioxide and titanium pentoxide mixed coating layer, and the thicknesses of the same coating layers are different.
Description
Technical Field
The invention relates to the technical field of photography, in particular to a composite coating layer, a lens barrel, a lens and photographing equipment.
Background
The camera is an extremely important ring in various factors of imaging quality of the shooting equipment, and along with development of the smart phone, the smart phone becomes the most widely used shooting equipment at present, and performance indexes of various aspects of the shooting equipment are always developed at high speed. The shooting capability of the mobile phone is one of the performances of the mobile phone, which is most concerned by consumers. The pixels of the mobile phone camera are from 30 ten thousand to 4100 ten thousand in the early stage, and depend on the development of the adopted sensor, lens and software technology, wherein the lens is used as a component for carrying out the first processing procedure on light rays, and is exposed to the outside, and a lens hood can not be arranged like a camera lens in the design of the mobile phone lens, so that the light entering quantity of the mobile phone lens inevitably comprises more non-imaging light except imaging light, the non-imaging light irradiates on the inner wall of the lens barrel, and the imaging light also irradiates between the lenses and the inner wall of the lens barrel after passing through the lenses, so that the actual imaging light contains messy light rays reflected between the inner wall of the lens barrel and the lenses, and the final imaging forms ghost images and flare, and the phenomenon is more obvious when a bright light source is contained in a shot.
Disclosure of Invention
The invention mainly aims to provide a composite coating layer which aims to reduce the reflection of light on the inner wall of a lens barrel so as to improve the imaging quality of shooting equipment.
In order to achieve the above object, the present invention provides a coating layer comprising:
the first film layer is plated on the inner wall of the lens barrel and is a silicon dioxide film layer; the first film layer thickness d 1 ∈[20nm，30nm]；
The second film layer is plated on the first film layer, and is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the second film layer 2 ∈[10nm，20nm]；
A third film layer plated on the second film layer, wherein the third film layer is a silicon dioxide film layer; thickness d of the third film layer 3 ∈[80nm，100nm]；
A fourth film layer plated on the third film layer, wherein the fourth film layer is a titanium pentoxide film layer; thickness d of the third film layer 4 ∈[10nm，15nm]；
A fifth film layer plated on the fourth film layer, wherein the fifth film layer is a silicon dioxide film layer; thickness d of the fifth film layer 5 ∈[130nm，150nm]；
A sixth film layer plated on the fifth film layer, wherein the sixth film layer is a titanium pentoxide film layer; thickness d of the sixth film layer 6 ∈[10nm，15nm]；
A seventh film layer plated on the sixth film layer, wherein the seventh film layer is a silicon dioxide film layer; thickness d of the seventh film layer 7 ∈[55nm，65nm]；
An eighth film layer plated on the seventh film layer, wherein the eighth film layer is a titanium pentoxide film layer; thickness d of the eighth film layer 8 ∈[40nm，50nm]；
A ninth film layer plated on the eighth film layer, wherein the ninth film layer is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the ninth film layer 9 ∈[25nm，35nm]；
A tenth film layer plated on the ninth film layer, wherein the tenth film layer is a titanium pentoxide film layer; thickness d of the tenth film layer 10 ∈[45nm，55nm]；
An eleventh film layer coated on the tenth layerThe eleventh film layer is a silicon dioxide film layer; thickness d of the eleventh film layer 11 ∈[75nm，85nm]。
Preferably, the device further comprises a twelfth film plated on the eleventh film, wherein the twelfth film is an AF film; thickness d of the twelfth film layer 12 ∈[35nm，45nm]。
Preferably, the thickness d of the third film layer 3 ∈[85nm，95nm]。
Preferably, the thickness d of the fifth film layer 5 ∈[135nm，145nm]。
The invention also provides a lens barrel, wherein the inner wall of the lens barrel is plated with a composite film layer, and the composite film layer comprises:
the first film layer is plated on the inner wall of the lens barrel and is a silicon dioxide film layer; the first film layer thickness d 1 ∈[20nm，30nm]；
The second film layer is plated on the first film layer, and is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the second film layer 2 ∈[10nm，20nm]；
A third film layer plated on the second film layer, wherein the third film layer is a silicon dioxide film layer; thickness d of the third film layer 3 ∈[80nm，100nm]；
A fourth film layer plated on the third film layer, wherein the fourth film layer is a titanium pentoxide film layer; thickness d of the third film layer 4 ∈[10nm，15nm]；
A fifth film layer plated on the fourth film layer, wherein the fifth film layer is a silicon dioxide film layer; thickness d of the fifth film layer 5 ∈[130nm，150nm]；
A sixth film layer plated on the fifth film layer, wherein the sixth film layer is a titanium pentoxide film layer; thickness d of the sixth film layer 6 ∈[10nm，15nm]；
A seventh film layer plated on the sixth film layer, wherein the seventh film layer is a silicon dioxide film layer; thickness d of the seventh film layer 7 ∈[55nm，65nm]；
An eighth film layer coated on the seventh film layer, the eighth filmThe layer is a titanium pentoxide film layer; thickness d of the eighth film layer 8 ∈[40nm，50nm]；
A ninth film layer plated on the eighth film layer, wherein the ninth film layer is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the ninth film layer 9 ∈[25nm，35nm]；
A tenth film layer plated on the ninth film layer, wherein the tenth film layer is a titanium pentoxide film layer; thickness d of the tenth film layer 10 ∈[45nm，55nm]；
An eleventh film layer plated on the tenth film layer, wherein the eleventh film layer is a silicon dioxide film layer; thickness d of the eleventh film layer 11 ∈[75nm，85nm]。
The invention also provides a lens, the lens barrel adopts a lens barrel with the inner wall plated with a composite film layer, and the composite film layer comprises:
the first film layer is plated on the inner wall of the lens barrel and is a silicon dioxide film layer; the first film layer thickness d 1 ∈[20nm，30nm]；
The second film layer is plated on the first film layer, and is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the second film layer 2 ∈[10nm，20nm]；
A third film layer plated on the second film layer, wherein the third film layer is a silicon dioxide film layer; thickness d of the third film layer 3 ∈[80nm，100nm]；
A fourth film layer plated on the third film layer, wherein the fourth film layer is a titanium pentoxide film layer; thickness d of the third film layer 4 ∈[10nm，15nm]；
A fifth film layer plated on the fourth film layer, wherein the fifth film layer is a silicon dioxide film layer; thickness d of the fifth film layer 5 ∈[130nm，150nm]；
A sixth film layer plated on the fifth film layer, wherein the sixth film layer is a titanium pentoxide film layer; thickness d of the sixth film layer 6 ∈[10nm，15nm]；
A seventh film layer plated on the sixth film layer, wherein the seventh film layer is a silicon dioxide film layer; the saidThickness d of seventh film layer 7 ∈[55nm，65nm]；
An eighth film layer plated on the seventh film layer, wherein the eighth film layer is a titanium pentoxide film layer; thickness d of the eighth film layer 8 ∈[40nm，50nm]；
A ninth film layer plated on the eighth film layer, wherein the ninth film layer is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the ninth film layer 9 ∈[25nm，35nm]；
A tenth film layer plated on the ninth film layer, wherein the tenth film layer is a titanium pentoxide film layer; thickness d of the tenth film layer 10 ∈[45nm，55nm]；
An eleventh film layer plated on the tenth film layer, wherein the eleventh film layer is a silicon dioxide film layer; thickness d of the eleventh film layer 11 ∈[75nm，85nm]。
The invention also provides shooting equipment, which adopts a lens with the inner wall of the lens barrel plated with a composite film layer, wherein the composite film layer comprises:
the first film layer is plated on the inner wall of the lens barrel and is a silicon dioxide film layer; the first film layer thickness d 1 ∈[20nm，30nm]；
The second film layer is plated on the first film layer, and is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the second film layer 2 ∈[10nm，20nm]；
A third film layer plated on the second film layer, wherein the third film layer is a silicon dioxide film layer; thickness d of the third film layer 3 ∈[80nm，100nm]；
A fourth film layer plated on the third film layer, wherein the fourth film layer is a titanium pentoxide film layer; thickness d of the third film layer 4 ∈[10nm，15nm]；
A fifth film layer plated on the fourth film layer, wherein the fifth film layer is a silicon dioxide film layer; thickness d of the fifth film layer 5 ∈[130nm，150nm]；
A sixth film layer plated on the fifth film layer, wherein the sixth film layer is a titanium pentoxide film layer; the sixth film layerThickness d 6 ∈[10nm，15nm]；
A seventh film layer plated on the sixth film layer, wherein the seventh film layer is a silicon dioxide film layer; thickness d of the seventh film layer 7 ∈[55nm，65nm]；
An eighth film layer plated on the seventh film layer, wherein the eighth film layer is a titanium pentoxide film layer; thickness d of the eighth film layer 8 ∈[40nm，50nm]；
A ninth film layer plated on the eighth film layer, wherein the ninth film layer is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the ninth film layer 9 ∈[25nm，35nm]；
A tenth film layer plated on the ninth film layer, wherein the tenth film layer is a titanium pentoxide film layer; thickness d of the tenth film layer 10 ∈[45nm，55nm]；
An eleventh film layer plated on the tenth film layer, wherein the eleventh film layer is a silicon dioxide film layer; thickness d of the eleventh film layer 11 ∈[75nm，85nm]。
According to the technical scheme, the multilayer coating is adopted, so that the effects of the film layer on light reflection resistance, reflection reduction and absorption are comprehensively utilized for multiple times, the reflectivity of the film layer is reduced, and the glare phenomenon in photography is weakened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a composite membrane layer according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of the composite film of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. 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.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
With the rapid development of intelligent devices, photography is no longer a building of heavy and professional devices to create activities, and becomes an indispensable part of life of people at present, and the photography is self-timer and beautiful, and photos or videos presented in various social circles represent the coming of the shooting times of the whole people. However, even so, backlighting, which has long plagued the photography industry, remains an problematic issue. In addition to the difficulty in handling the contrast problem, the problem of disturbance of the backlight is accompanied by the problem of glare in the final image, i.e. glare in the case of backlight.
The reason that glare is generated is mainly that the light entering the camera head contains a lot of other light besides the imaging light directly irradiating the sensor, other light is blocked by the aperture and cannot directly irradiate the sensor, but the light is reflected in the lens barrel, after reflection, part of the light irradiates the sensor through the aperture, so that the light finally irradiates the sensor to mix with stray light, and as a result, on an imaged photo, some halation or light spots appear around the light source, which is the so-called glare phenomenon. Of course, the cause of the flare phenomenon includes reflection between lenses in addition to reflection from the inner wall of the lens barrel, and only reflection from the inner wall of the lens barrel plays a major role in the formation of the flare phenomenon.
In order to eliminate glare, it is common practice to blacken the inner wall of the lens barrel, and some large-sized lenses are processed by adhering black flannelette to the inner wall of the lens barrel to reduce reflection of light by the inner wall of the lens barrel. Black flannelette is adhered to the inner wall of the lens barrel or black paint is adopted to blacken the inner wall of the lens barrel, so that the effect is not very good, and the glare phenomenon is easy to occur when a bright light source is contained in an imaging area.
In addition, the sensitivity of the photoelectric sensor to light is different from that of human eyes, the sensitive wave band of human eyes to light is the visible light wave band, the sensitive range of the photoelectric sensor used by the camera to light is larger than the sensitive range of human eyes to light, particularly, the influence of ultraviolet light on imaging is obvious, and when the ultraviolet light is strong, the shot photo is easy to whiten just because of the exposure of the sensor to the ultraviolet light. And, it is obtained through comparison test that some of the light rays causing glare are ultraviolet light.
In general, for a user of a single-lens reflex camera, interference of ultraviolet rays can be eliminated by adding a UV mirror (for filtering ultraviolet rays) to a lens. However, the UV lens is not designed for the lens itself, and general UV lens has a negative effect on imaging, and UV lens with smaller negative effect is more expensive.
Therefore, the invention provides a super black composite coating layer, which is coated on the inner wall of the lens barrel to reduce the reflection of light on the inner wall of the lens barrel, thereby reducing or even completely eliminating the glare phenomenon.
Referring to fig. 1, the composite coating layer provided by the present invention includes eleven coating layers, wherein a first coating layer is directly coated on the inner wall of the lens barrel, and a silicon dioxide coating layer is used, and the thickness of the silicon dioxide coating layer is between 20nm and 30 nm; the second film layer is plated on the first film layer, and adopts a silicon dioxide and titanium pentoxide mixed film layer, and the thickness of the second film layer is between 10nm and 20 nm; the third film layer is plated on the second film layer, and adopts a silicon dioxide film layer, and the thickness of the silicon dioxide film layer is between 80nm and 100 nm; the fourth film layer is plated on the third film layer, and is a titanium pentoxide film layer with the thickness of 10nm to 15 nm; the fifth film layer is plated on the fourth film layer, and adopts a silicon dioxide film layer, and the thickness of the silicon dioxide film layer is between 130nm and 150 nm; the sixth film layer is plated on the fifth film layer, and is a titanium pentoxide film layer with the thickness of 10nm to 15 nm; the seventh film layer is plated on the sixth film layer, and adopts a silicon dioxide film layer, and the thickness of the silicon dioxide film layer is between 55nm and 65 nm; the eighth film layer is plated on the seventh film layer, and is a titanium pentoxide film layer with the thickness of 40nm to 50 nm; the ninth film layer is plated on the eighth film layer, and adopts a silicon dioxide and titanium pentoxide mixed film layer, and the thickness of the film layer is between 25nm and 35 nm; the tenth film layer is plated on the ninth film layer, and is a titanium pentoxide film layer with the thickness of 45nm to 55 nm; the eleventh film is plated on the tenth film, and a silicon dioxide film is adopted, and the thickness of the silicon dioxide film is between 75nm and 85 nm.
For sodium yellow light (wavelength of 589 nm), the standard refractive index of the silicon dioxide film layer is 1.46, the standard refractive index of the titanium pentoxide film layer is 2.35, and under different film plating processes, the refractive indexes of the silicon dioxide film layer and the titanium pentoxide film layer are changed, but the qualified film layer cannot deviate from the standard refractive index too much. The refractive index of the silicon dioxide and the titanium pentoxide mixed film layer is between the standard refractive index of the silicon dioxide and the standard refractive index of the titanium pentoxide. The wavelength range of visible light in vacuum is between 380nm and 780nm, the wavelength of ultraviolet light is less than 380nm, and the wavelength of infrared light is more than 780nm. The same medium has different refractive indices for different light waves and is inversely proportional to the wavelength, for example, for sodium yellow light, the standard refractive index of the silica film is 1.46, for 380nm light at the lower limit of visible wavelengths, the standard refractive index of silica is 1.46×589/380=2.26, and for 380nm light at the lower limit of visible wavelengths, the standard refractive index of the titanium pentoxide film is 2.35×589/380=3.64.
The antireflection film layer can be divided into a lens system antireflection film and a non-lens system antireflection film according to the application, wherein the lens system antireflection film is also called an antireflection film, and the composite coating layer provided by the invention belongs to the non-lens system antireflection film and mainly reduces reflection through absorption.
The surface layer film of the composite film layer, namely the eleventh layer film, reduces reflection by reversely utilizing the Bragg equation. The bragg equation is 2dsin θ=nλ, where θ is the angle of incidence, d is the dielectric layer thickness, λ is the wavelength, and n is a positive integer. When the optical path difference between the optical path of the incident light in the medium and the optical path of the incident light directly reflected by the incident surface is an integral multiple of the wavelength, the scattered light is enhanced, and the scattered light can be regarded as reflected light, that is, enhanced reflection. The reverse utilization of the Bragg equation is to design the film layer so that the optical path difference is an odd multiple of half wavelength, and reduce reflection through coherent cancellation.
Taking light in a propagation system of three dielectric layers as an example for simple explanation, the light source is positioned on the first dielectric layer, one part of incident light is injected into the second dielectric layer from the first dielectric layer, and the other part of the incident light is reflected back to the first dielectric layer through the interface between the first dielectric layer and the second dielectric layer; after passing through the interface between the second medium layer and the third medium layer, the light rays injected into the second medium layer are totally reflected back to the second medium layer, or part of the light rays are injected into the third medium layer, and the other part of the light rays are reflected back to the second medium layer; when the light reflected back to the second dielectric layer propagates to the interface between the second dielectric layer and the first dielectric layer, one part of the light is incident to the first dielectric layer, and the other part of the light is reflected back to the second dielectric layer. The light source light rays areThe light rays which are injected into the second medium layer through the interface between the first medium layer and the second medium layer are +.>The light reflected back to the first dielectric layer by the first dielectric layer and the second dielectric layer is +.>The light reflected back to the second dielectric layer through the interface between the second dielectric layer and the third dielectric layer is +.>The light rays which are injected into the first medium layer through the interface between the second medium layer and the first medium layer are +.>Then->And->Is coherent light. When->And->When the optical path difference of (a) is an integer multiple of the wavelength (an even multiple of half wavelength), the bragg equation 2dsinθ=nλ, < ->And->Interference superposition is enhanced, and reflection is enhanced at the moment; when->And->When the optical path difference of (2) is an odd multiple of half wavelength, < + >>And->Coherence counteracts, when the reflection is reduced. The reflection gradually changes from weakest to strongest as the optical path difference gradually changes from an odd multiple of half wavelength to an even multiple of half wavelength.
In the multi-medium layer propagation system, the interfaces of different mediums are multiple, the reflection between two adjacent medium surfaces can pass multiple times, and the corresponding refraction can also be multiple times, and the three medium layers can be referred to as multiple bundles and multiple groupsAndcoherent light, but with a light intensity which is relative to +.>And->Smaller, the effect of actual interference is also smaller.
The energy distribution of natural light is concentrated between 500nm and 750nm, so the thickness of the eleventh layer film of the invention is designed in a targeted anti-reflection way for the wave band range. According to the principle, the silicon dioxide has the best antireflection effect on natural light when the film thickness is between 55nm and 83nm in theory.
However, for the inner wall of the lens barrel, the light irradiated to the inner wall of the lens barrel is disordered, the inner wall of the lens barrel is not a plane, and when the data obtained by taking ideal parallel light as a principle is applied to the inner wall of the lens barrel, the anti-reflection effect is not ideal, in addition, according to the control of different coating process details, the stability of two key indexes of the refractive index and the thickness of a film can be different, the thickness of the silicon dioxide film layer on the surface layer is controlled to be between 70nm and 90nm, and the comprehensive anti-reflection effect is better under the specific environment of the lens barrel. On the premise of stable process, the thickness of the surface silicon dioxide film layer is controlled between 75nm and 85nm, so that the antireflection effect is better.
After the problem of surface reflection is solved by utilizing the eleventh film layer, the tenth film layer adopts the titanium pentoxide film layer to absorb the light rays entering the tenth film layer.
The absorption cut-off wavelength of the single-crystalline titanium pentoxide crystal is 400nm, namely light waves lower than 400nm can be absorbed by the single-crystalline titanium pentoxide crystal, the crystal growth of the titanium pentoxide film layer is not single-crystalline, but is in a polycrystal form composed of tiny single-crystal units, the energy level is far more complex than that of the single-crystalline titanium pentoxide crystal, the light absorption range is wider, the absorption capacity is better, more light rays entering the titanium pentoxide film layer can be absorbed, but the light rays cannot be absorbed completely, and a part of the light rays can penetrate the film layer. When the exogenous light rays are injected into the tenth film layer, the light rays are emitted and refracted at the interface formed by the two surfaces of the tenth film layer except the absorbed part, and at this time, the eleventh film layer, the tenth film layer and the ninth film layer form a propagation system of the three-layer dielectric layer. With reference to the anti-reflection design of the eleventh film, the tenth film performs a targeted anti-reflection design for light rays emitted by the eleventh film toward the tenth film but not absorbed by the tenth film, reducing the amount of light rays reflected back to the eleventh film layer from the interface of the tenth film and the eleventh film.
According to the energy distribution of the natural light spectrum and the absorption of the titanium pentoxide film layer to the natural light, the energy distribution of the light which is not absorbed after entering the tenth film layer can be obtained theoretically, and the thickness of the tenth film layer is designed according to the energy distribution, so that the reflection of the light of a concentrated wave band in the energy distribution is reduced. However, the thickness of the titanium pentoxide film also affects its absorption of light, with the absorption increasing with increasing film thickness. Through practical tests, when the thickness of the tenth film layer is in the range of 45nm-55nm, the light finally reflected from the tenth film layer back to the eleventh film layer can be controlled at a lower level. When the thickness of the film is difficult to be controlled within the range of 45-55 nm in the production process, the film should be controlled within the range of 40-65 nm, and more reflection can be generated when the thickness exceeds the range, so that the final effect of the composite film provided by the application cannot be achieved.
The greater the thickness of the titanium pentoxide film, the greater the amount of light absorbed, and from this point of view, the greater the thickness of the tenth film, but the greater the reflection and refraction that the light itself will transmit from the eleventh film to the tenth film, the thickness range of the tenth film being controlled to attenuate the reflection in the opposite direction using the bragg equation. However, for the composite film, the effect of the total thickness of the titanium pentoxide film on the total reflectivity of the composite film is still that the greater the total thickness of the titanium pentoxide film, the higher the total absorptivity of light, and the less the amount of reflection and transmission.
Therefore, when light is emitted from the tenth film layer to the deeper film layer, the absorption of light by the film layer is prioritized. The invention adopts the silicon dioxide and the titanium pentoxide mixed film layer as the transition layer adjacent to the tenth film layer, namely the ninth film layer, and then the eighth film layer adjacent to the ninth film layer still adopts the titanium pentoxide film layer to further absorb the light rays, which is not described in detail herein.
However, the titanium pentoxide film layer cannot fully absorb all spectral regions of natural light, and in a wave band with a wavelength greater than 550nm, the absorption rate of the titanium pentoxide film layer is very low, so that in order to eliminate light rays in the wave band, a method of combining a method of reducing reflection by using a Bragg equation in a reverse direction and a method of adding transmission by using light wave superposition in a forward direction is adopted to eliminate the light rays in the wave band. When the light finally reaches the inner wall of the lens barrel, the residual quantity is less, and the lens barrel also has a strong absorption effect, so that the light reflected by the inner wall of the lens barrel is extremely less, and the light of the extremely less part also needs to undergo the effect of eleven layers of films in the process of outwards transmitting, and finally, the quantity of the light reflected to the outside of the eleventh layer of films by the inner wall of the lens barrel can not cause any influence on the imaging of the sensor, so that the imaging can be completely ignored. Specifically, the three silicon dioxide film layers of the seventh film layer, the fifth film layer and the third film layer in the composite film layer provided by the application play roles of reducing reflection and increasing transmission. The transmission-increasing coating layer is designed as an antireflection film of the reference lens system, and is well known in the art and will not be described herein. The sixth film layer, the fourth film layer and the second film layer are transition layers, mainly play a role in separating the seventh film layer, the fifth film layer, the third film layer and the first film layer, and simultaneously also give consideration to light absorption. The first film plated on the inner wall of the lens cone adopts a silicon dioxide film layer, so that the adhesiveness of the composite film layer provided by the application can be improved, and the situation that the film layer falls off from the inner wall of the lens cone is avoided.
Based on theoretical calculation, the selection of film thickness of each layer is combined with the actual application environment, a large number of cross comparison tests are carried out, the original data are too complicated, the ratio of the valuable data amount is too small, and the selected part of valuable data is shown in the following table:
the reflectivity is measured when the composite film is plated on the inner wall of the lens cone under the simulated natural light. The third film layer and the fifth film layer have larger influence on the comprehensive reflectivity, the optimal values of the thicknesses of the third film layer and the fifth film layer are tested in a targeted manner, and partial data are shown in the following table:
the above data shows that the reflectance of the composite film layer is more stable and more closely approaches the limit of the test when the thickness of the third film layer is between 85nm and 95nm and the thickness of the fifth film layer is between 135nm and 145 nm. Therefore, in the case where the process level can precisely control the plating film thickness, it is preferable to control the thickness of the third film layer and the thickness of the fifth film layer within the above-described ranges.
In addition, the limit reflectivity of the black cloth for absorbing light in industry can be about 3%, the black rubber can be about 4%, and the carbon black coating can be about 4%. At present, in some high-grade and large-size lens barrels, a layer of black flannelette is adhered to the inner wall of the lens barrel, so that the reflection of light on the inner wall of the lens barrel is reduced.
Of course, in terms of cost, the cost of adopting black flannelette is lower than that of adopting the multilayer coating proposed by the application, but its effect is also corresponding to be obviously lower than that of the composite coating layer proposed by the application, and the reflection of light of the inner wall of the lens barrel can not be eliminated by adopting a mode of adhering the flannelette in a small lens barrel, in the small lens barrel, the mode of adopting more coating at present, the reflectivity of the carbon black coating with better effect can only be about 4%, and the black rubber is easy to tear after being made into a thin layer, and can not be stably adhered in the lens barrel, so that the black rubber is unsuitable to be used as an antireflection layer of the inner wall of the lens barrel, and even if the defects of the black rubber are overcome, the reflectivity of the black rubber is far higher than that of the composite coating layer with the minimum reflectivity of 2.01% proposed by the application.
The inside of the lens is a non-closed space, and the lens can move during focusing and zooming, so that air flow is often generated between the inside of the lens barrel and the outside, and the air flow is also the reason that dust is easy to enter after the inside of the lens is used for a period of time. The dust also contains grease particles which are easy to adhere to the inner wall of the lens barrel, so that the lens is difficult to clean thoroughly without being disassembled. Therefore, referring to fig. 2, in other embodiments, the application further proposes to plate a twelfth film layer, namely an AF film, outside the eleventh film layer, where the AF film is an oil-stain-proof film widely used for a mobile phone screen at present, and has a better oil-stain-proof capability, so that dirt such as dust, oil stains and the like can be effectively prevented from adhering to the inner wall of the lens barrel. To avoid the influence of AF film on antireflection of other film layers, the AF film layer of the inventionThickness d of (2) 12 Between 35nm and 45 nm. When the thickness of the AF film layer is in this interval, the antireflection effect of the whole composite film layer is hardly adversely affected.
In addition, the application also provides a lens barrel with the inner wall adopting the composite coating layer and a lens adopting the lens barrel. The lens cone provided by the application can effectively eliminate the reflection of light inside the lens cone, and can obviously reduce glare even if a film plating lens with extremely high cost is not adopted. Based on this, the lens proposed in the present application can reduce the glare of the final imaging at a lower cost.
The application also provides shooting equipment adopting the lens provided by the application, and the shooting equipment comprises at least one of a mobile phone, a camera, a video camera, a tablet personal computer and an independent camera (such as a USB camera of a computer peripheral or a somatosensory camera of somatosensory equipment).
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (8)
1. The utility model provides a compound coating layer of absorption light, is plated in the lens cone inner wall, reduces the reflection of lens cone inner wall to light, its characterized in that includes:
the first film layer is plated on the inner wall of the lens barrel and is a silicon dioxide film layer; the first film layer thickness d 1 ∈[20nm，30nm]；
The second film layer is plated on the first film layer, and is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the second film layer 2 ∈[10nm，20nm]；
A third film layer plated on the second film layer, wherein the third film layer is a silicon dioxide film layer; thickness d of the third film layer 3 ∈[80nm，100nm]；
A fourth film layer coated on the third filmThe fourth film layer is a titanium pentoxide film layer; thickness d of the third film layer 4 ∈[10nm，15nm]；
A fifth film layer plated on the fourth film layer, wherein the fifth film layer is a silicon dioxide film layer; thickness d of the fifth film layer 5 ∈[130nm，150nm]；
A sixth film layer plated on the fifth film layer, wherein the sixth film layer is a titanium pentoxide film layer; thickness d of the sixth film layer 6 ∈[10nm，15nm]；
A seventh film layer plated on the sixth film layer, wherein the seventh film layer is a silicon dioxide film layer; thickness d of the seventh film layer 7 ∈[55nm，65nm]；
An eighth film layer plated on the seventh film layer, wherein the eighth film layer is a titanium pentoxide film layer; thickness d of the eighth film layer 8 ∈[40nm，50nm]；
A ninth film layer plated on the eighth film layer, wherein the ninth film layer is a mixed film layer of silicon dioxide and titanium pentoxide; thickness d of the ninth film layer 9 ∈[25nm，35nm]；
A tenth film layer plated on the ninth film layer, wherein the tenth film layer is a titanium pentoxide film layer; thickness d of the tenth film layer 10 ∈[45nm，55nm]；
An eleventh film layer plated on the tenth film layer, wherein the eleventh film layer is a silicon dioxide film layer; thickness d of the eleventh film layer 11 ∈[75nm，85nm]。
2. The composite coating layer according to claim 1, further comprising a twelfth film layer plated on the eleventh film layer, the twelfth film layer being an AF film layer; thickness d of the twelfth film layer 12 ∈[35nm，45nm]。
3. The composite coating layer according to claim 1, wherein the thickness d of the third coating layer 3 ∈[85nm，95nm]。
4. The composite coating layer according to claim 1, whereinIn that the thickness d of the fifth film layer 5 ∈[135nm，145nm]。
5. A lens barrel, wherein an inner wall of the lens barrel is coated with the composite coating layer according to any one of claims 1 to 4.
6. A lens comprising the lens barrel according to claim 5.
7. A photographing apparatus, characterized in that it comprises the lens as claimed in claim 6.
8. The photographing apparatus of claim 7, wherein the photographing apparatus comprises at least one of a cell phone, a camera, a video camera, a tablet computer, or a video camera.
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| CN104536067A (en) * | 2015-01-22 | 2015-04-22 | 浙江星星瑞金科技股份有限公司 | Far-infrared sapphire window protection screen for night vision |
| CN105403942A (en) * | 2015-12-02 | 2016-03-16 | 利达光电股份有限公司 | Blue-glass infrared cutoff filter and film plating method thereof |
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| CN105911617A (en) * | 2016-06-23 | 2016-08-31 | 江西兴邦光电股份有限公司 | Coating material capable of reducing reflectivity of optical lens |
| CN209070122U (en) * | 2018-12-12 | 2019-07-05 | 深圳菲比特光电科技有限公司 | Composite Coatings film layer, lens barrel, camera lens and capture apparatus |
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| CN104536067A (en) * | 2015-01-22 | 2015-04-22 | 浙江星星瑞金科技股份有限公司 | Far-infrared sapphire window protection screen for night vision |
| CN105403942A (en) * | 2015-12-02 | 2016-03-16 | 利达光电股份有限公司 | Blue-glass infrared cutoff filter and film plating method thereof |
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