CN105005804A - Highly secure miniature optical label system - Google Patents

Abstract

The invention discloses a micro-optical label system with high security, which includes a light source, a light-transmitting substrate and an optical microlens imaging system, and a two-dimensional code pattern is arranged on the light-transmitting substrate; wherein, the light-transmitting substrate is located at On the object focal plane of the optical microlens imaging system, the light output by the light source is projected onto the light-transmitting substrate to generate transmitted light, and the transmitted light is transmitted through the optical microlens imaging system to an external receiving end. Based on the confocal imaging technique, a novel micro-optical labeling system is proposed. Among them, the light source can be LED, and the size of the miniature two-dimensional code light-transmitting substrate is designed according to the optical characteristics of the optical microlens imaging system and the receiving end of the optical label such as a mobile phone camera. The miniature two-dimensional code can use various methods such as password anti-counterfeiting and software encryption to keep the contained information confidential. Therefore, the design system of the miniature optical label has extremely high security.

Description

A Miniature Optical Labeling System with High Security

technical field

The invention relates to the fields of information security technology and micro-optical imaging technology, in particular to a high-security micro-optical label system.

Background technique

With the continuous development of information technology, various labels are used everywhere, among which barcode technology and radio frequency automatic identification (RFID) are the most widely used. At present, bar code technology, as a key information identification and information collection technology, is constantly developing in the application process. In the early 1990s, people invented two-dimensional bar codes, which are used to store relevant information of numbers, texts, pictures, and sounds. The one-dimensional barcode can only store numbers and characters, which increases the amount of information storage. Moreover, it also has the characteristics of high information density, strong error correction ability, strong confidentiality, and fast reading speed. However, two-dimensional barcodes and one-dimensional barcodes have a common disadvantage: larger size.

In today's information society, with the introduction of the concept of the Internet of Things, the current application of RFID tags based on RFID technology continues to rise. Although RFID has the advantages of large information capacity, fast and convenient identification methods, etc., it has high costs and low confidentiality. Strong, vulnerable to electromagnetic interference and other shortcomings.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a micro-optical label system with high security. The present invention combines two-dimensional barcode technology and micro-optical imaging technology to overcome the shortcomings of two-dimensional barcode and RFID. It has the advantages of large amount of stored information, small size, high security and low cost.

The present invention adopts the following technical solutions for solving the problems of the technologies described above:

According to the present invention, a micro-optical label system with high security includes a light source, a light-transmitting substrate and an optical microlens imaging system, and regular patterns are arranged on the light-transmitting substrate; wherein, the light-transmitting substrate is located On the object focal plane of the microlens imaging system, the light output by the light source is projected onto the light-transmitting substrate to generate transmitted light, and the transmitted light is transmitted through the optical microlens imaging system to an external receiving end.

As a further optimization scheme of a highly secure micro-optical label system according to the present invention, the regular graphic is a two-dimensional code graphic.

As a further optimization scheme of a high-security micro-optical label system described in the present invention, the light source is an LED.

As a further optimization scheme of the high-security micro-optical label system described in the present invention, the light output by the light source is background light.

As a further optimization scheme of a high-security micro-optical label system described in the present invention, the optical imaging of the optical micro-lens imaging system adopts confocal technology.

As a further optimization scheme of a high-security micro optical label system in the present invention, the size of the regular pattern on the transparent substrate is calculated according to the optical characteristics of the optical microlens imaging system and the external receiving end.

As a further optimization scheme of a highly secure micro-optical tag system described in the present invention, the external receiving end is a mobile phone camera.

As a further optimization scheme of a high-security micro-optical label system in the present invention, the two-dimensional code adopts password anti-counterfeiting or software encryption to keep information confidential.

As a further optimization scheme of a highly secure micro-optical label system described in the present invention, the information is fingerprints and photos.

Compared with the prior art, the present invention adopts the above technical scheme and has the following technical effects: the present invention combines two-dimensional barcode technology and micro-optical imaging technology, overcomes the shortcomings of two-dimensional barcode and RFID, and has the advantages of both, such as storage Large amount of information, small size, high security, low cost, etc.

Description of drawings

Figure 1 is a schematic diagram of the structure of the micro-optical label system.

Figure 2 is an optical schematic diagram of the miniature optical label.

The reference signs in the figure are interpreted as: 1-light source, 2-miniature two-dimensional code light-transmitting substrate, 3-optical microlens imaging system, 4-receiving end, 5-field diaphragm of receiving end.

Detailed ways

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

As shown in FIG. 1 , a schematic structural diagram of a micro-optical label system with high security, including a light source 1 , a micro-two-dimensional code light-transmitting substrate 2 , and an optical micro-lens imaging system 3 . Among them, the light source is background light, which can be LED, and the miniature two-dimensional barcode can be protected by password anti-counterfeiting, software encryption, and the information contained in it, such as fingerprints and photos, for confidentiality. The system is similar to the optical transmitter in the wireless optical communication system, and can be divided into light source, modulator and optical antenna. The LED is the light source, the miniature two-dimensional code light-transmitting substrate is the modulator, the optical microlens imaging system is the optical antenna, and the LED light source projects light on the micro-two-dimensional code light-transmitting substrate. Through the black square, the information is modulated to the optical antenna in this way, and the optical antenna converts the modulated light source output signal into a transmission beam output.

The miniature two-dimensional barcode can be protected by password anti-counterfeiting, software encryption, and the information contained in it, such as fingerprints and photos, for confidentiality. According to the optical characteristics of the optical microlens imaging system and the receiving end of the optical label, such as a mobile phone camera, the size of the micro two-dimensional code light-transmitting substrate is designed. The micro-two-dimensional code light-transmitting substrate is located on the object focal plane of the optical microlens imaging system, and the imaging plane of the micro-two-dimensional code light-transmitting substrate at the receiving end is located on the image-space focal plane of the receiving end imaging system.

As shown in Figure 2: an optical schematic diagram of a micro-optical label with high security, the field of view diaphragm 5 at the receiving end passes through the image plane formed by the optical microlens imaging system 3 in the object space, the receiving end 4, the receiving end end of the field diaphragm 5. d1 is the aperture size of the imaging surface of the field diaphragm 5 at the receiving end in the object space through the optical microlens imaging system 3, which limits the size d2 of the micro-two-dimensional code light-transmitting substrate, which is located in the optical The object focal plane of the microlens imaging system, so d3 is equal to the focal length of the microlens imaging system, d4 is the detection distance from the micro-optical label to the receiving end, and d5 is the aperture size of the field stop 5 at the receiving end.

Taking the mobile phone camera as an example at the receiving end, the technical solution of the present invention is further described in detail: the minimum value of the size d2 of the miniature two-dimensional code is determined by the pixels of the image sensor of the mobile phone camera; assuming that the focal length of the objective lens of the mobile phone camera is f', then Based on the theoretical calculation of Gaussian optics, according to Newton's formula and vertical magnification formula, the imaging size d2'=f'·d5/d4 of the size d2 of the micro-two-dimensional code transparent substrate can be designed. According to GB/T 18284-2000 in the standard QR Code of the People’s Republic of China series of QR Code, the number of modules with the highest capacity version 40 is 177×177. In order to satisfy the reading requirements of the mobile phone camera, each module occupies at least four pixels, and the pixel points of the image sensor of the mobile phone camera are at least (177×2)×(177×2)=354×354=125316. When the array size of the mobile phone camera image sensor is 7176×5319 μm and the pixel size is 1.8 μm, the minimum size of the two-dimensional code block that can be distinguished and recognized is 354×1.8 μm=0.6372mm. If a photoplotter with an accuracy of 40 μm is used to make a micro-two-dimensional code light-transmitting substrate, and the number of modules of the micro-two-dimensional code is 25×25, the size of the micro-two-dimensional code block is 25×40 μm=1mm, which is greater than 0.6372mm fulfil requirements.

According to GB/T18284-2000 in the standard QR Code of the People’s Republic of China series of QR Code, the number of modules with the highest capacity version 40 is 177×177. In order to satisfy the reading at the receiving end, each module occupies at least four pixels, so the image sensor pixels at the receiving end are at least (177×2)×(177×2)=354×354=125316. If the array size of the image sensor at the receiving end is m×n (μm) and the pixel size is p (μm), the minimum size of the two-dimensional code block that can be resolved and recognized is 354×p (μm).

The invention discloses a micro-optical label system with high security, which aims to combine two-dimensional barcode technology and micro-optical imaging technology, overcome the shortcomings of two-dimensional barcode and RFID, and have the advantages of both, such as storing information Large quantity, small size, high safety, low cost, etc. The present invention adopts the structural form of "light source + miniature two-dimensional code light-transmitting substrate + optical microlens imaging system". The miniature two-dimensional code light-transmitting substrate is located The imaging plane of the substrate at the receiving end is located on the image square focal plane of the imaging system at the receiving end, forming a confocal imaging system. Based on the theoretical calculation of Gaussian optics, according to the optical characteristics of the optical microlens imaging system and the optical label receiving end such as the mobile phone camera, the size of the light-transmitting substrate of the miniature two-dimensional code is designed. The miniature two-dimensional code can adopt password anti-counterfeiting, software encryption and other Methods keep the contained information confidential. The invention can provide a new idea for the design of high-safety information labels. Therefore, the design system of the miniature optical label has extremely high security, which can provide a reliable technical idea for information security.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. have a micro-optical tag system for high security, it is characterized in that, comprise light source, transparent substrates and optical microlens imaging system, described transparent substrates is provided with regular figure; Wherein, described transparent substrates is positioned on the object space focal plane of optical microlens imaging system, produces transmitted light after the light that described light source exports is projected to transparent substrates, and this transmitted light exports transmitting beam to external reception end through optical microlens imaging system.

2. a kind of micro-optical tag system with high security according to claim 1, it is characterized in that, described regular figure is two-dimension code pattern.

3. a kind of micro-optical tag system with high security according to claim 1, it is characterized in that, described light source is LED.

4. a kind of micro-optical tag system with high security according to claim 1, is characterized in that, the light that described light source exports is bias light.

5. a kind of micro-optical tag system with high security according to claim 1, is characterized in that, have employed common focusing technology in the optical imagery of described optical microlens imaging system.

6. a kind of micro-optical tag system with high security according to claim 1, is characterized in that, the size of the regular figure on described transparent substrates calculates according to the optical characteristics of optical microlens imaging system, external reception end.

7. a kind of micro-optical tag system with high security according to claim 1, it is characterized in that, described external reception end is mobile phone camera.

8. a kind of micro-optical tag system with high security according to claim 2, is characterized in that, described Quick Response Code adopts the method for cipher counterfeit-proof or software cryptography to maintain secrecy to information.

9. a kind of micro-optical tag system with high security according to claim 8, it is characterized in that, described information is fingerprint, photo.