CN217902222U - Code reader optical system based on super lens and code reader - Google Patents
Code reader optical system based on super lens and code reader Download PDFInfo
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Abstract
The application provides a code reader optical system and code reader based on super lens, wherein, this code reader optical system based on super lens includes: the device comprises a light supplementing module and an imaging module; the light supplement module comprises: a plurality of fill-in lamps; the imaging module includes: an image sensor and a superlens; a plurality of light supplement lamps are arranged around the super lens; after the bar code to be identified is illuminated by the plurality of light supplementing lamps, changing the focal length of the super lens; the focus is changed the back super lens acquire and is come from the light of bar code, and will come from the light convergence of bar code is to image on the image sensor, obtains the clear image of bar code to utilize the super lens that can zoom to replace the mechanical zoom system and the liquid lens zoom system that use traditional imaging element, simplified the optical system structure of code reader, reduced the mechanical loss, weight and the volume of code reader, be favorable to the miniaturization and the lightweight of code reader.
Description
Technical Field
The application relates to the technical field of code readers, in particular to a code reader optical system based on a super lens and a code reader.
Background
At present, code readers are more and more widely applied along with more and more code scanning scenes. Code readers having a variable focus optical system are becoming the mainstream choice because they can read barcodes of different working distances. However, the zoom optical system in the code reader with the zoom optical system generally adopts a mechanical zoom system and a liquid lens zoom system, and both of the two zoom systems need to use a conventional imaging element, which results in a large volume and heavy weight of the code reader, which is not favorable for the miniaturization and light weight of the code reader.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the embodiments of the present application aim to provide a code reader optical system and a code reader based on a superlens.
In a first aspect, an embodiment of the present application provides a superlens-based code reader optical system, including: the device comprises a light supplementing module and an imaging module;
the light supplement module comprises: a plurality of fill-in lamps; the imaging module includes: an image sensor and a superlens;
a plurality of light supplement lamps are arranged around the super lens;
after the bar code to be identified is illuminated by a plurality of light supplement lamps, changing the focal length of the superlens by applying excitation;
and the superlens with the changed focal length acquires light rays from the bar code and converges the light rays from the bar code on the image sensor for imaging to obtain a clear image of the bar code.
In a second aspect, an embodiment of the present application further provides a code reader, including: a superlens based code reader optical system as described in the first aspect above.
In the solutions provided in the foregoing first aspect to the second aspect of the embodiments of the present application, by providing a superlens capable of zooming in a code reader optical system based on the superlens, before identifying a barcode, zooming in the superlens, so that the zoomed superlens converges light from the barcode onto an image sensor for imaging, thereby obtaining a clear image of the barcode; compared with a code reader adopting a mechanical zoom system with a traditional imaging element and a liquid lens zoom system in the related technology, the code reader utilizes the zoom super lens to replace the mechanical zoom system and the liquid lens zoom system which use the traditional imaging element, and the super lens has the characteristic of lightness and thinness, so that the optical system structure of the code reader can be simplified, the mechanical loss, the weight and the volume of the code reader can be reduced, the code reader is very beneficial to miniaturization and lightweight, and the code reader can adapt to a smaller installation environment; moreover, the stepless focal length adjustment of the optical system of the code reader is realized, and the response speed is higher.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of an optical system of a superlens-based code reader provided by an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating superlens zooming in an imaging module of a superlens-based code reader optical system provided by an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating an identification barcode of a code reader having the superlens based code reader optical system according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a superlens structure provided by an embodiment of the present application;
fig. 5 is a schematic structural diagram illustrating a fill-in lamp with a super-surface according to an embodiment of the present disclosure;
fig. 6 shows a schematic structural diagram of structural units respectively included in a super-surface provided by an embodiment of the present application.
An icon: 100. a light supplement lamp; 200. an image sensor; 202. a superlens; 2002. a substrate; 2004. a nanostructure; 2006. a phase change material layer; 2008. a first electrode layer; 2010. a second electrode layer; 500. and (4) super-surface.
Detailed Description
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
At present, code readers are generally divided into handheld code readers (i.e., handheld code scanning guns) and fixed-position code readers according to use scenarios. The code reader with fixed position can read the bar code in industrial production. The code reader is generally divided into a fixed-focus code reader with fixed working distance and a variable-focus code reader capable of realizing perfect imaging according to different working distances. The fixed focus code reader is usually limited by a use scene, and can only read codes at a preset working distance, once the working distance is changed, clear imaging cannot be realized, and the code reading effect is influenced, so that the limitation is very large. The variable-focus code reader can zoom the imaging lens according to different working distances so as to obtain a clear imaging effect of the bar code and read data of the bar code. Aiming at a shot bar code image, a weighing standard is arranged in the code reader, when the definition of the bar code image is lower than a set image definition standard, a lens of the code reader is controlled to automatically zoom, and zooming is finished until the definition of the bar code image acquired by the code reader is higher than the set image definition standard. Common zoom code readers are generally as follows.
One is a mechanical zoom type code reader, the mechanical zoom part includes: the electric lens seat and the servo circuit drive the focusing micro motor, and the mechanical zooming part drives the imaging element group in the lens to move back and forth along the axial direction of the main optical axis of the lens, so that the effect of adjusting the focal length is realized. This approach relies entirely on mechanical movement and has the following disadvantages: firstly, mechanical movement needs a certain time, and particularly the reciprocating movement needs to be carried out near a focusing clear band to adjust the optimal focusing position, so that certain hysteresis exists; moreover, since a space reserved for the axial movement of the lens is required, the volume of the lens with the conventional imaging element group is large, and the overall volume of the mechanical zoom code reader is inevitably increased.
The other is a code reader which adopts a liquid lens for zooming. A liquid lens is an optical element made of liquid. The liquid lens can dynamically adjust the refractive index of the liquid lens or change the focal length of the lens by changing the curvature of the liquid lens without mechanical control and only changing the internal structure of the liquid lens by external voltage driving, thereby realizing the automatic zooming of the lens, and realizing the seamless zooming of different objects at different distances by adjusting the radians of the objects similar to the crystalline lens of human eyes. The liquid lens has the advantages of non-mechanical focusing and capability of greatly prolonging the service life; and stepless regulation is realized through electric control, and the focusing speed is higher than that of the mechanical focusing. However, the liquid lens is also required to be used with a conventional imaging element, so that the code reader using the liquid lens is also large in size and heavy in weight; moreover, the imaging effect of the liquid lens is limited by the clear aperture, so that obvious stray light interference exists in the imaging process, and the imaging definition is slightly poor; moreover, the manufacturing cost is high.
Based on this, the embodiment of the application provides a code reader optical system and a code reader based on a super lens, wherein a super lens capable of zooming is arranged in the code reader optical system based on the super lens, before a bar code is identified, the super lens is zoomed, so that the zoomed super lens converges light rays from the bar code onto an image sensor for imaging, and a clear image of the bar code is obtained; the super lens capable of zooming is utilized to replace a mechanical zooming system and a liquid lens zooming system which use the traditional imaging element, and the super lens has the characteristics of lightness and thinness, so that the optical system structure of the code reader can be simplified, the mechanical loss, weight and volume of the code reader can be reduced, the code reader is very beneficial to miniaturization and lightweight, and the code reader can adapt to smaller installation environment; moreover, the stepless focal length adjustment of the optical system of the code reader is realized, and the response speed is higher.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and examples.
Examples
Referring to the front view of the superlens-based code reader optical system shown in fig. 1 and the schematic view of the superlens zoom in the imaging module of the superlens-based code reader optical system shown in fig. 2, the present embodiment proposes a superlens-based code reader optical system, including: light filling module and imaging module.
The light supplement module comprises: a plurality of fill-in lamps 100; the imaging module includes: an image sensor 200 and a superlens 202.
In the code reader optical system based on the superlens proposed in the present embodiment, the superlens is used as a zoom optical lens of the code reader optical system based on the superlens.
In order to enable the image sensor to receive the light from the barcode converged by the superlens, the distance between the image sensor and the superlens should be less than or equal to the focal length of the image sensor.
Optionally, the image sensor is located at a focal plane of the superlens.
The barcode, may be but is not limited to: one-dimensional codes and two-dimensional codes.
As shown in fig. 1, a plurality of fill-in lamps may be disposed around the superlens. Of course, besides the situation shown in fig. 1, the plurality of light supplement lamps may be arranged in other manners, which is not described herein again.
For imaging operations, the image sensor, including but not limited to: CMOS and CCD.
Referring to FIG. 3, a schematic view of an identification bar code of a code reader having the superlens based code reader optical system; when the code reader optical system based on the superlens needs to image the bar code, a plurality of light supplementing lamps in the light supplementing system are turned on, light supplementing light beams emitted by the light supplementing lamps illuminate the bar code to be recognized, namely the bar code to be recognized is illuminated by the light supplementing lamps, and in order to obtain a clear image of the bar code, the focal length of the superlens needs to be changed by applying excitation.
In one embodiment, the manner in which the stimulus is applied to the superlens includes, but is not limited to: an electrically controlled excitation mode, an optically controlled excitation mode and a mechanical excitation mode.
The electrically controlled excitation mode may be to apply voltage excitation to the superlens, that is, to change the refractive index of the nanostructure/filling material in the superlens by applying voltage to change the focal length of the superlens. Namely, the electric control excitation mode can change the focal length of the super lens by loading different voltages on the super lens.
The light-operated excitation mode can be that controllable light is focused on the nano structure of the super lens, and the light is controlled to excite the nano structure to change the refractive index, so that the zoom of the super lens is realized.
The mechanical excitation mode can be a mode of changing the position arrangement of the nano structures by mechanically stretching the substrate of the super lens to realize the zoom of the super lens.
And the superlens with the changed focal length acquires light rays from the bar code and converges the light rays from the bar code on the image sensor for imaging to obtain a clear image of the bar code.
The light from the bar code is the light reflected by the bar code and entering the superlens.
The focus position of the super lens is adjusted on the main optical axis of the super lens, so that the super lens is zoomed, and after zooming, the focus position of the super lens can be located on the main optical axis of the super lens, so that the imaging module can obtain a clear image of the bar code.
For the characteristic that the superlens can perform phase modulation on wavefront, amplitude, polarization, and the like of an incident light beam, in order to achieve the purpose of zooming the superlens, in the code reader optical system based on the superlens provided in this embodiment, different excitations may be applied to the superlens, so as to change the focal length of the superlens.
Specifically, referring to the schematic structural diagram of the superlens shown in fig. 4, the superlens includes: a substrate 2002, nanostructures 2004, a phase change material layer 2006, a first electrode layer 2008, and a second electrode layer 2010.
A plurality of nanostructures are arranged on one side of the substrate, the first electrode layer is filled around the nanostructures, and the height of the first electrode layer is lower than that of the nanostructures; the phase change material layer is arranged on one side, far away from the substrate, of the first electrode layer and is filled around the nano structure, and the sum of the heights of the first electrode layer and the phase change material layer is larger than or equal to the height of the nano structure; the second electrode layer is arranged on one side, far away from the substrate, of the phase change material layer.
The first electrode layer and the second electrode layer can load voltage on the phase-change material layer, and the phase-change material layer can change the focal length of the superlens according to different loaded voltages.
As shown in fig. 4, the upper surface of the phase change material layer is not lower than the upper surface of the nano-structure, so as to avoid the nano-structure contacting the second electrode layer.
After the phase change material layer receives the voltages applied by the first electrode layer and the second electrode layer, the phase change state of the phase change material layer is changed, so that the focal length of the super lens is changed. In this embodiment, the first electrode layer may be a positive electrode layer, and the second electrode layer may be a negative electrode layer; alternatively, the first electrode layer may be a negative electrode layer, and the second electrode layer may be a positive electrode layer, which is not limited in this embodiment.
The super lens not only comprises a substrate and a nanostructure, but also selects a phase change material layer as a filling material to be filled around the nanostructure in a targeted manner, the characteristic that the phase change material layer can correspondingly change a phase change state after being influenced by voltage is utilized, so that the focal length of the super lens is changed, a certain voltage is applied to the phase change material layer filled around the nanostructure by adopting a first electrode layer and a second electrode layer, when the phase change material layer receives the voltage, the focal length of the super lens can be changed by the phase change material layer, the focal length at the moment is different from the focal length when the voltage is not applied, and the stepless focal length adjustment of the optical system of the code reader is realized. The imaging module of the superlens can realize large-range focusing at the axial position of the code reader to obtain a clear bar code image; the code reader optical system based on the super lens uses the super lens to replace a traditional optical lens or a liquid lens to realize zooming, has the advantages of light weight, thin overall thickness, simple system, lower price and high productivity, has simpler overall structure, and is relatively stable in the process of changing the focal length of the super lens.
The substrate of the superlens may be quartz glass, crown glass, flint glass, etc., and the plurality of nanostructures disposed on one side of the substrate of the superlens (the upper side of the substrate is shown in fig. 4) may be highly uniform nanostructures, which may apply a geometric phase to incident light when the nanostructures are polarization-dependent structures, such as nanofins and nanoellipsoids; when the nanostructures are polarization independent structures, such as nanocylinders and nanosquare structures, they can apply a propagation phase to incident light; and, these nanostructures can be all-dielectric structural units, have high transmittance in the visible light band, and the selectable materials include: titanium oxide, silicon nitride, fused silica, aluminum oxide, gallium nitride, gallium phosphide, amorphous silicon, crystalline silicon, hydrogenated amorphous silicon, and the like.
When the loaded voltage changes, the phase change material layer can change the refractive index of the phase change material layer.
When the refractive index is small, the focal length of the superlens becomes large.
In the case where the refractive index becomes large, the focal length of the superlens becomes small.
In one embodiment, the fill Light is a Light-Emitting Diode (LED). In order to identify different forms of barcodes in different application scenarios, the LEDs include, but are not limited to: white LEDs, red LEDs, or blue LEDs.
When the code reader reads a code, the light supplement lamp is needed to illuminate a visual field, and conditions are provided for a lens to acquire light from the bar code. Under ideal conditions, the light supplementing light beams emitted by the light supplementing lamp can uniformly illuminate the bar code to be identified, and no over-bright or over-dark area exists in the field of view of the lens. However, due to the complexity of the code scanning scene, the barcode is often located on different materials, and may be located on a highly reflective metal or a surface with very uneven reflection of incident light, or even may be located on an arc surface. If the light supplementing light beam irradiates the highly reflective surface, strong stray light reflected by the highly reflective surface around the barcode also enters the visual field of the superlens, so that the barcode image is overexposed, the overexposed barcode image is unclear, the barcode cannot be identified and cannot be identified, and the success rate of barcode identification is reduced.
In the related art, in order to eliminate the strong reflection stray light entering the lens, one method is to place the plane where the code reader and the barcode are located in a relatively inclined manner, so that the strong reflection stray light does not enter the lens, and the purpose of passively eliminating the strong reflection stray light entering the lens of the code reader is achieved. The other method is active reflection elimination, a polarizing filter is added in front of a lens of the code reader, and the polarizing filter is used for offsetting partial strong reflection stray light, so that the strong reflection stray light is blocked before entering the lens. The method for eliminating the strong reflection stray light has high requirements on the polarization performance and extinction ratio of the polarization filter, has very strict requirements on the material performance and the assembly process of the polarization filter, and cannot achieve the best effect of eliminating the strong reflection stray light with slight deviation. There is therefore a need for better ways to achieve elimination of strongly reflected stray light.
Therefore, in the code reader optical system based on the super lens proposed in the embodiment, the super surface is used to eliminate the strong reflection stray light entering the lens. The super surface is placed in front of the light supplement lamp, namely, emergent light of the light supplement lamp is firstly subjected to phase modulation of the super surface. The sub-wavelength micro-nano structure in the super-surface enables the light supplementing light beam emitted by the light supplementing lamp to be uniformly diffused out and uniformly diffused to the detection plane with the bar code, so that the light supplementing light beam can uniformly illuminate the whole view field of the detection plane with the bar code, and meanwhile, an over-exposure phenomenon cannot be generated in a certain area of the detection plane, and strong reflection stray light is prevented from being incident into a lens; the specific phase relationship that the metasurface should be designed to determine can be determined by generalized Snell's law.
Specifically, referring to the schematic structural diagram of the fill-in light with a super-surface shown in fig. 5, in order to eliminate strong reflection stray light entering a lens by using the super-surface, in the optical system of the code reader based on the super-lens according to the embodiment, the fill-in light module further includes: a super surface 500.
The super surface is located on the light emitting side of the light supplement lamp.
And the super surface is used for carrying out phase modulation on the light supplementing light beam emitted by the light supplementing lamp, and the light supplementing light beam after phase modulation can be uniformly diffused to the bar code.
Specifically, in order to perform phase modulation on a fill-in light beam emitted by a fill-in light lamp, the super-surface includes: the device comprises a substrate and a plurality of micro-nano structures. The micro-nano structures are arranged on the substrate.
The modulation phase of the super surface to the supplementary lighting beam emitted by the supplementary lighting lamp satisfies the generalized Snell's law, that is, the modulation phase of the super surface to the supplementary lighting beam emitted by the supplementary lighting lamp satisfies the following formulas 1 to 4:
wherein n is i The method comprises the steps of representing the refractive index of a first medium to light from a bar code in the process of propagating the light from the bar code in the first medium inside an imaging module; n is t The refractive index of the second medium to the light from the bar code is represented in the process that the light from the bar code is uniformly diffused by the super surface and is transmitted by the second medium outside the code reader optical system based on the super lens; theta r The reflection angle of the light from the bar code after being incident to the super surface and reflected by the super surface is represented; theta.theta. i Representing the angle of incidence of light from the bar code onto the super-surface;
representing the modulation phase of the micro-nano structure at the position of the super surface (x, y) on the light supplementing light beam; theta.theta. t The emergent angle of the light from the bar code after being incident on the super surface and being modulated by the super surface phase is represented; phi is a unit of r1 A wave vector representing the projection of a ray from the barcode reflected by the super-surface onto a plane perpendicular to the plane of incidence; phi is a unit of t1 The projection of the wave vector of the light emitted from the bar code after being modulated by the super surface phase on a plane vertical to the incident plane is represented; k is a radical of formula 0 And (= 2 pi/lambda), wherein lambda represents the wavelength of light of a light filling lamp of the code reader.
Under the condition of satisfying the generalized Snell's law, the phase modulation of the supplementary lighting beam emitted by the supplementary lighting lamp by the super-surface satisfies the following formula 5 by deducing the above four formulas:
wherein,
representing the modulation phase of the micro-nano structure positioned at the position of the super surface (x, y) to the supplementary lighting beam; (x, y) represents the position coordinates of the micro-nano structure relative to the center of the super surface; λ represents the wavelength of the fill-in light beam; f denotes the focal length of the super surface.
The micro-nano structure of the super surface can be guided and designed through the formula 5, and phase modulation of the light supplementing light beam is achieved.
Referring to a schematic structural diagram of structural units respectively included in the super surface shown in fig. 6, each structural unit can modulate incident light, and a micro-nano structure can directly adjust and control characteristics such as a light phase; in this embodiment, the micro-nano structure is an all-dielectric structure unit, and has a high transmittance at least in a visible light band, and the selectable materials include: titanium oxide, silicon nitride, fused silica, aluminum oxide, gallium nitride, gallium phosphide, hydrogenated amorphous silicon, and the like. The micro-nano structures are arranged in an array, so that structural units can be divided; the structural units can be regular hexagons, squares, sectors and the like, and the central position of each structural unit or the central position and the vertex position of each structural unit are respectively provided with a micro-nano structure. All the micro-nano structures can be located on the same side of the substrate, or a part of the micro-nano structures are located on one side of the substrate, and the other part of the micro-nano structures are located on the other side of the substrate.
It should be noted that the substrate of the super surface is an integral layer structure, and a plurality of structural units in the super surface may be artificially divided, that is, a plurality of micro-nano structures are arranged on the substrate, so that a structural unit including one or more micro-nano structures may be divided, or a plurality of structural units may form a super surface of an integrated structure.
The code reader optical system based on the super lens provided by the embodiment uses the super lens to replace the traditional imaging element (lens group and/or imaging lens), realizes automatic zooming of the super lens by loading different voltages to the super lens, simplifies the structure, realizes the function of stepless focal length adjustment, reduces the mechanical loss and volume, and has quicker response. In addition, the strong reflection stray light on the surface of the bar code is eliminated by utilizing the phase modulation effect of the super surface on the light, and the purpose of uniform light supplement imaging is achieved.
This embodiment also provides a code reader, including: the superlens-based code reader optical system described above.
In summary, in the code reader optical system and the code reader based on the superlens provided in this embodiment, the superlens capable of zooming is disposed in the code reader optical system based on the superlens, and before the barcode is identified, the superlens is zoomed, so that the zoomed superlens converges light from the barcode onto the image sensor for imaging, and a clear image of the barcode is obtained; compared with a code reader adopting a mechanical zoom system with a traditional imaging element and a liquid lens zoom system in the related technology, the code reader has the advantages that the super lens capable of zooming is utilized to replace the mechanical zoom system and the liquid lens zoom system which use the traditional imaging element, and the super lens has the characteristic of lightness and thinness, so that the optical system structure of the code reader can be simplified, the mechanical loss, the weight and the volume of the code reader can be reduced, the code reader is very beneficial to miniaturization and lightweight, and the code reader can adapt to smaller installation environment; moreover, the stepless focal length adjustment of the optical system of the code reader is realized, and the response speed is higher.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. A superlens based code reader optical system, comprising: the device comprises a light supplementing module and an imaging module;
the light supplement module comprises: a plurality of fill-in lamps; the imaging module includes: an image sensor and a superlens;
a plurality of light supplement lamps are arranged around the super lens;
after the bar code to be identified is illuminated by a plurality of light supplement lamps, changing the focal length of the superlens by applying excitation;
and the superlens with the changed focal length acquires the light rays from the bar code and converges the light rays from the bar code onto the image sensor for imaging to obtain a clear image of the bar code.
2. The superlens-based code reader optical system of claim 1, wherein the means for applying an excitation to the superlens comprises: an electric control excitation mode;
and in the electric control excitation mode, different voltages are loaded on the super lens, so that the focal length of the super lens is changed.
3. The superlens-based code reader optical system of claim 2, wherein the superlens comprises: the phase change material comprises a substrate, a nano structure, a phase change material layer, a first electrode layer and a second electrode layer;
a plurality of nanostructures are arranged on one side of the substrate, the first electrode layer is filled around the nanostructures, and the height of the first electrode layer is lower than that of the nanostructures; the phase change material layer is arranged on one side, far away from the substrate, of the first electrode layer and is filled around the nano structure, and the sum of the heights of the first electrode layer and the phase change material layer is larger than or equal to the height of the nano structure; the second electrode layer is arranged on one side, far away from the substrate, of the phase change material layer;
the first electrode layer and the second electrode layer can load voltage on the phase change material layer, and the phase change material layer can change the focal length of the super lens according to different loaded voltages.
4. The superlens-based code reader optical system of claim 3, wherein the phase change material layer is capable of changing a refractive index of the phase change material layer upon a change in an applied voltage;
when the refractive index is smaller, the focal length of the superlens is larger;
in the case where the refractive index becomes large, the focal length of the superlens becomes small.
5. The superlens-based code reader optical system of any one of claims 1-4, wherein the fill light module further comprises: a super-surface;
the super surface is positioned on the light emitting side of the light supplementing lamp;
and the super surface is used for carrying out phase modulation on the light supplementing light beams emitted by the light supplementing lamp, and the light supplementing light beams after phase modulation can be uniformly diffused to the bar codes.
6. The superlens-based code reader optical system of claim 5, wherein the supersurface comprises: the device comprises a substrate and a plurality of micro-nano structures;
and the micro-nano structures are arranged on the substrate.
7. The superlens-based code reader optical system according to claim 6, wherein the phase modulation of the fill-in light beam emitted from the fill-in light lamp by the supersurface satisfies the following equation when the generalized Snell's law is satisfied:
wherein,
the representation is located in the super tableModulating the phase of the light supplementing light beam by the micro-nano structure at the surface (x, y) position; (x, y) represents the position coordinates of the micro-nano structure relative to the center of the super surface; λ represents the wavelength of the fill-in light beam; f denotes the focal length of the super surface.
8. The superlens-based code reader optical system according to any one of claims 1 to 4, wherein the fill light is a Light Emitting Diode (LED).
9. The superlens-based code reader optical system of claim 8, wherein the LED comprises: white LEDs, red LEDs, or blue LEDs.
10. The superlens-based code reader optical system of any one of claims 1-4, wherein the image sensor comprises: CMOS and CCD.
11. The superlens-based code reader optical system of claim 2, wherein the means for applying an excitation to the superlens further comprises: optically actuated and mechanically actuated.
12. A code reader, comprising: the superlens-based code reader optical system of any one of claims 1-11.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| US11988844B2 (en) | 2017-08-31 | 2024-05-21 | Metalenz, Inc. | Transmissive metasurface lens integration |
| CN118172361A (en) * | 2024-05-14 | 2024-06-11 | 山东省科学院激光研究所 | Bar code detection method and detection system based on liquid lens |
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2022
- 2022-08-24 CN CN202222232291.XU patent/CN217902222U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11988844B2 (en) | 2017-08-31 | 2024-05-21 | Metalenz, Inc. | Transmissive metasurface lens integration |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| CN118172361A (en) * | 2024-05-14 | 2024-06-11 | 山东省科学院激光研究所 | Bar code detection method and detection system based on liquid lens |
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