Anti-lost system for optical disc and optical disc

Abstract

This application relates to an anti-loss system for optical discs and an optical disc itself. The anti-loss system includes an anti-loss circuit and a monitoring module installed on a mobile terminal. The anti-loss circuit is coupled to a transparent ring region in the middle of the optical disc base. The anti-loss circuit has a short-range wireless communication module for wireless communication with the monitoring module. The monitoring module provides reminders according to a preset reminder method based on the wireless communication status. This application uses hardware and software to construct a complete system for anti-loss applications of optical discs, featuring ease of use, convenient management, and compliance with relevant confidentiality regulations.

Description

Technical Field

[0001] This application relates to the fields of finding and storing items, and in particular to an anti-loss system for optical discs and the optical disc itself. Background Technology

[0002] Secrets are categorized into four types: state secrets, work secrets, trade secrets, and personal privacy. The most common types are state secrets, work secrets, and trade secrets. There are two main types of entities that use CDs to transmit classified information: those dealing with state secrets, such as enterprises and research institutions, and those needing to protect their own trade secrets. Generally, entities dealing with state secrets transmit classified information by having individuals carry CDs containing the information. For trade secrets that could bring significant economic benefits to the rights holder, businesses may also use classified CDs to transmit the information.

[0003] If such classified CDs are lost while being carried by an individual, it will cause huge losses to both the country and the enterprise.

[0004] Currently, mainstream smart anti-loss devices mainly focus on device loss prevention and person loss prevention. Device loss prevention devices are relatively simple in form, mainly consisting of anti-loss patches or pendants, while person loss prevention devices come in a wider variety of forms, including pendants, watches, necklaces, shoes, etc. Additionally, placing confidential CDs in a smart secure case can also prevent loss.

[0005] While the aforementioned existing technologies can indeed play a certain role in preventing the loss of classified CDs, significant risks still exist.

[0006] 1. The physical entity that cannot achieve the anti-loss function is inseparable from the classified CD.

[0007] While existing products on the market can indeed help prevent the loss of classified CDs to some extent, significant risks still exist.

[0008] 1.1. Solutions using anti-loss devices

[0009] This method involves attaching the classified CD to the anti-loss device using ropes, hooks, or patches. However, this method is unreliable and prone to accidental separation. Furthermore, it is too simple and lacks concealment, making it easily detectable and posing a risk of deliberate separation.

[0010] 1.2. Solution using smart safes

[0011] This solution involves placing classified CDs in a secure box. However, there's a risk that, due to objective factors, the user might not actually place the classified CD in the smart secure box, yet the smart secure box itself might not detect this and still report it as normal, potentially leading to a major data breach. Furthermore, this method forces users to carry an extra box with just one CD when they go out, increasing their burden and reducing the user experience.

[0012] 2. CDs with anti-loss features cannot be used in the same way as ordinary CDs.

[0013] If a standard anti-loss device is used in conjunction with a classified CD, the CD must be removed from the anti-loss device before it can be inserted into a CD reader / writer; otherwise, the CD will not function properly. This approach adds extra steps to using the CD, increasing the difficulty for users and reducing the user experience.

[0014] 3. Existing solutions may violate current national and corporate laws and regulations.

[0015] The data stored on the classified CDs is classified information, and the location information of the classified CDs themselves is not allowed to be accessed by public networks according to national secrecy regulations. The "Standards for Level 1 / 2 / 3 Secrecy Qualification of Weapon and Equipment Research and Production Units" clearly stipulates that "without approval, devices with wireless communication functions and electronic devices with functions such as shooting and recording shall not be brought into key secrecy departments."

[0016] Many existing anti-loss solutions use products with built-in positioning and communication functions, directly interconnecting with public wireless communication networks, making physical isolation from the internet impossible. This approach violates relevant regulations and would not be acceptable to users dealing with matters involving state secrets. Summary of the Invention

[0017] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides an anti-loss system for optical discs and an optical disc.

[0018] This application provides an anti-loss system for optical discs, the anti-loss system including an anti-loss circuit and a monitoring module installed on a mobile terminal; the anti-loss circuit is coupled to a transparent ring area in the middle of the optical disc base, the anti-loss circuit has a short-range wireless communication module, the short-range wireless communication module is used to communicate wirelessly with the monitoring module; the monitoring module is used to provide reminders according to a preset reminder method based on the wireless communication status.

[0019] Optionally, the anti-loss circuit includes components, an antenna, and a substrate; the substrate is a ring-shaped PCB, one side of the substrate serves as the antenna bearing surface, and the other side is used to mount the components; the antenna surface is coated with a coating material.

[0020] Optionally, the annular substrate has one or more of the following properties:

[0021] The center of gravity of the annular substrate coincides with the center of gravity of the optical disc;

[0022] The thickness of the annular substrate ensures that it can be properly inserted into an optical disc reader / writer after assembly with the optical disc.

[0023] The weight of the ring substrate is such that, after assembly with the optical disc, it will not cause the drive motor of the optical disc reader / writer to malfunction due to overload.

[0024] Optionally, the protruding components on the anti-loss circuit are hollowed out in the transparent ring area in the middle of the optical disc base by mechanical processing.

[0025] Optionally, the components of the anti-loss circuit include a short-range wireless communication module, a clock crystal oscillator for providing the clock required for chip operation, and a decoupling capacitor for power supply filtering; the antenna is an arc-shaped irregular structure.

[0026] Optionally, the anti-loss system further includes a power supply device, which is located at the center of the optical disc holder base and coincides with the center of the optical disc.

[0027] Optionally, the power supply device is provided with three spring-type probes corresponding to the positive and negative terminal contact holes and positioning holes of the battery; the anti-loss circuit is designed with positive and negative terminal contact holes and positioning holes of the battery that are in close contact with the three spring-type probes.

[0028] Optionally, the wireless communication between the monitoring module and the short-range wireless communication module adopts a unidirectional mode of retrieval plus broadcasting.

[0029] Optionally, the short-range communication module is specifically used to send broadcast information containing identification information in a one-way mode; the monitoring module is specifically used to start continuously searching for the broadcast information of optical discs after startup, select the optical discs with pre-determined identification from the list of searched devices and bind them; and continuously receive the broadcast information of the bound optical discs, and provide reminders according to a preset reminder method based on the received signal strength and whether the broadcast information is detected within a preset time.

[0030] This application also provides an optical disc, on which the anti-loss system described in any of the above claims is provided.

[0031] The technical solutions provided in this application have the following advantages compared with the prior art:

[0032] The embodiments of this application employ hardware and software to construct a complete system for preventing the loss of classified optical discs, featuring ease of use, convenient management, and compliance with relevant confidentiality regulations. Compared to existing solutions for preventing the loss of classified optical discs, it offers the following advantages.

[0033] 1. This application provides effective security for the carrying of classified CDs outside the home;

[0034] 2. This application improves the management level of classified materials in units handling classified information and reduces the risk of leakage of classified information;

[0035] 3. This application has high security, does not introduce security vulnerabilities, and does not pose any risks in use;

[0036] 4. This application is easy to use and simple to operate. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 Block diagrams illustrating the configuration of the anti-loss systems provided in various embodiments of this application;

[0040] Figure 2 Schematic diagrams of the anti-loss circuits provided in various embodiments of this application;

[0041] Figure 3 Schematic diagrams of the printed antenna shape and performance provided for various embodiments of this application;

[0042] Figure 4 Schematic diagrams of the appearance of printed antennas provided for various embodiments of this application;

[0043] Figure 5 Schematic diagrams of anti-loss optical discs and specially designed optical disc cases with power supply devices provided in various embodiments of this application;

[0044] Figure 6 APP software flowcharts provided for various embodiments of this application;

[0045] Figure 7 These are schematic diagrams of the main interfaces of the APP provided in various embodiments of this application. Detailed Implementation

[0046] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0047] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0048] Example 1

[0049] This invention provides an anti-loss system for optical discs, comprising an anti-loss circuit and a monitoring module disposed on a mobile terminal. The anti-loss circuit is coupled to a transparent ring region in the middle of the optical disc substrate. The anti-loss circuit has a short-range wireless communication module for wirelessly communicating with the monitoring module. The monitoring module provides reminders according to a preset reminder method based on the wireless communication status. The short-range wireless communication module can be a short-range wireless communication chip.

[0050] In this embodiment of the invention, the optical disc can also be described as an anti-loss optical disc. The mobile terminal can be a mobile phone, and the monitoring module can be implemented using an APP. The preset reminder method can be vibration and ringtone alarms.

[0051] This invention presents a complete system for preventing the loss of classified optical discs, comprising hardware and software. It is characterized by ease of use, convenient management, and compliance with relevant confidentiality regulations. Compared to existing solutions for preventing the loss of classified optical discs, it offers the following advantages.

[0052] 1. This application provides effective security for the carrying of classified CDs outside the home;

[0053] 2. This application improves the management level of classified materials in units handling classified information and reduces the risk of leakage of classified information;

[0054] 3. This application has high security, does not introduce security vulnerabilities, and does not pose any risks in use;

[0055] 4. This application is easy to use and simple to operate.

[0056] The following uses a classified optical disc as an example to describe in detail the optional specific implementation methods of the embodiments of the present invention.

[0057] This embodiment provides an anti-loss system that can promptly detect when a classified optical disc moves away from its carrier beyond a certain distance and trigger an alarm. For example... Figure 1 As shown, this system consists of hardware including an anti-loss CD and a special CD case, and an APP software that can be installed on a mobile phone.

[0058] The anti-loss principle employed in this embodiment involves coupling an anti-loss circuit with short-range wireless communication capabilities into the transparent ring area in the center of the optical disc base. Because the anti-loss circuit is made sufficiently thin and light, its tight coupling with the optical disc does not affect its normal read / write operation. The optical disc with the aforementioned anti-loss circuit is inserted into a specially designed optical disc case equipped with a power supply, enabling short-range wireless communication between the disc and the user's mobile phone, which has a dedicated app pre-installed. When the distance between the user's mobile phone and the classified optical disc exceeds a preset distance, the phone vibrates and rings to alert the user that they are too far from the disc, thus achieving the anti-loss function when carrying the classified optical disc outside the home.

[0059] The system architecture used in this embodiment is only for preventing the loss of classified optical discs and does not cover other classified media such as paper documents, USB flash drives, and external hard drives. Therefore, in addition to preventing loss, the classified optical disc loss prevention system must also comply with relevant policies and regulations. Thus, the design concept of the classified optical disc loss prevention system must adhere to the following principles.

[0060] 1. The anti-loss circuit should be made as compact as possible so that it cannot be easily separated from the optical disc;

[0061] 2. Minimize the overall weight of the anti-loss disc so as not to affect its normal use;

[0062] 3. The system connects to the user's mobile phone via short-range wireless communication and does not access public wireless networks;

[0063] 4. The system can completely cut off power in classified locations and does not actively transmit radio signals;

[0064] 5. The system uses a unique and proprietary communication method to prevent malicious attacks.

[0065] I. Hardware Technical Solution of this Implementation Method

[0066] The hardware technical solution includes circuit design, antenna design, structural design, and power supply design.

[0067] For circuit design:

[0068] like Figure 2As shown, the anti-loss circuit consists of a dedicated short-range wireless communication chip, an external oscillation circuit, and resistor-capacitor components. The communication chip encodes the fixed-content digital broadcast signal, performs up-conversion processing through the internal RF circuit, and simultaneously couples the RF signal to a planar hard-brush antenna to radiate the broadcast signal. The external crystal oscillator provides the frequency source required for the communication chip to operate. The anti-loss circuit uses very few electronic components: only a dedicated short-range wireless communication chip, a crystal oscillator to provide the clock signal required for chip operation, and a decoupling capacitor for power supply filtering. Specifically, the communication chip encodes the fixed-content digital broadcast signal, performs up-conversion processing through the internal RF circuit, and simultaneously couples the RF signal to a planar hard-brush antenna to radiate the broadcast signal. The external crystal oscillator provides the frequency source required for the communication chip to operate.

[0069] In a general sense, any communication between the sender and receiver that transmits information via electromagnetic waves (infrared, radio microwaves) over a short distance, typically within tens of meters, can be considered short-range wireless communication. Its main characteristics are as follows:

[0070] 1. Short communication distance, with a coverage distance generally between 10 and 200 meters;

[0071] 2. Low transmission power, generally less than 100mW;

[0072] 3. Wide range of applications: It can be freely connected to various personal portable electronic devices, computer peripherals and various home appliances to achieve information sharing and wireless transmission of multiple services.

[0073]

[0074] Optionally, the selected short-range wireless communication chip features a high-performance, low-power 32-bit processor, 256KB of SPI NOR system flash memory, and supports multiple common protocols. It has multiple programmable GPIO pins, built-in 64KB SRAM, and supports interfaces such as PWM / PDM / DMA / I2C / SPI / UART. The chip integrates wireless transceiver circuitry, filtering circuitry, and dedicated signal processing circuitry internally; only an external antenna is needed to achieve short-range wireless communication functionality. The short-range wireless communication chip can be configured in a low-power mode via software, periodically broadcasting its identity identifier. The broadcast time is configurable by software; the chip remains in sleep mode at other times to minimize power consumption.

[0075] The crystal oscillator uses the commercially available small SMD2520 package, which measures 2.5mm x 2.0mm.

[0076] For antenna design:

[0077] The antenna is crucial to the product design; its space cannot exceed 300mm², and its shape must be an irregular structure with arc-shaped boundaries. For example, one end of the antenna connects to an anti-loss circuit; the other end matches the shape of the outer ring of an optical disc, forming an arc; two parallel openings are provided between the two ends of the antenna, making it a Z-shaped three-segment structure; the arc shape and the three-segment structure constitute an arc-shaped irregular structure. Currently, the antenna structures of existing short-range wireless communication devices on the market are basically rectangular, and their operating frequencies and dimensions do not meet the requirements.

[0078] To meet the specific requirements of this product's antenna, a printed antenna method is used to achieve a tight integration with the PCB. At the same time, considering the actual physical distribution of the metal and dielectric layers around the antenna, detailed electromagnetic field simulation is performed using the electromagnetic field simulation software HFSS.

[0079] like Figure 3 The diagram shows the outline and performance of the printed antenna. Optionally, the printed antenna dimensions are 17.4mm × 20.3mm, with an area of ​​approximately 180, ensuring stable and reliable communication. It also allows for precise control of signal power and effective communication distance, preventing issues related to excessive alarm distance.

[0080] To improve the reliability of the antenna and protect it from external temperature, humidity, salt spray, and physical abrasion, a special coating material is used to protect it and also enhance the product's appearance.

[0081] For structural design:

[0082] (1) Physical shape and material of circuit board

[0083] The anti-loss circuit consists of component assembly and a substrate. The physical shape and size of the substrate determine the installation location of the anti-loss circuit. Considering that the anti-loss circuit needs to be tightly integrated with ordinary optical discs without affecting the normal use of the discs, the substrate must have the following characteristics:

[0084] The center of gravity of the substrate must be perfectly aligned with the center of gravity of the optical disc; otherwise, the optical disc will vibrate during high-speed rotation due to the deviation of the center of gravity, affecting the normal use of the optical disc.

[0085] The thickness of the substrate cannot be too high, and after assembly with the optical disc, it can be normally placed into the optical disc reading and writing device without causing structural conflict.

[0086] The substrate itself is relatively lightweight, so excessive weight will not cause the drive motor of the optical disc reader / writer to fail due to overload.

[0087] The substrate should be able to withstand a certain amount of external stress impact.

[0088] Based on the above considerations, this embodiment uses a ring-shaped PCB solution to address the aforementioned requirements. One side of the substrate serves as the planar antenna support surface, while the other side is used to assemble the necessary components. Simultaneously, the substrate thickness is strictly controlled, and the component layout is rationally planned through simulation calculations to ensure that the physical center of gravity of the anti-loss circuit coincides with the optical disc. The inherent properties of the PCB material also ensure a uniform distribution of the center of gravity and mechanical strength within a relatively small physical space.

[0089] (2) Processing of optical disc media

[0090] To achieve the aforementioned tight coupling effect, a special design scheme was adopted: the portion of the optical disc relative to the protruding components on the anti-loss circuit was hollowed out by mechanical processing, making full use of the media thickness of the non-storage area of ​​the optical disc, and controlling the overall height of the anti-loss optical disc within a fixed and precise range to adapt to the vast majority of optical disc reading and writing devices on the market.

[0091] like Figure 4 As shown, the difference between a loss-proof CD and a regular CD is that the loss-proof CD has a ring-shaped short-range wireless communication circuit coupled to the transparent ring area in the middle of the disc substrate on one side of the printed layer of a regular CD. Compared with a regular CD, the thickness of the loss-proof CD is only slightly increased. This ensures that the loss-proof CD can be inserted into most CD / DVD reading and writing devices currently on the market and complete normal CD / DVD reading and writing.

[0092] For power supply design:

[0093] The system is designed to use a separate power supply unit, independent of the anti-loss circuit, to power the anti-loss disc. In non-classified locations, the two can be combined for normal operation and anti-loss functionality. In classified locations, the power supply unit can be quickly separated, allowing the anti-loss disc to be used independently.

[0094] like Figure 5 As shown, the power supply for the anti-loss disc is designed as a separate circuit with a battery, integrated with the disc case. It contacts the metal contacts on the anti-loss circuit via a metal spring pin. The power supply is located at the center of the disc case base, coinciding with the center of the anti-loss disc.

[0095] When designing the physical interface of the power supply device, the following two points are mainly considered:

[0096] (1) Connector selection

[0097] When ordinary metal pins are used as the physical contact points between the anti-loss circuit and the power supply device, an additional housing is required to ensure accurate alignment and stable contact of the connector. However, due to size limitations, anti-loss optical discs cannot accommodate additional accessories besides the contact pins, making a stable power supply a potential issue affecting system reliability. To address this, we considered using connectors that generate deformation stress upon contact as the physical contact points, without adding any additional accessories. This, in conjunction with the optical disc case, ensures a stable and reliable contact between the anti-loss circuit and the power supply device.

[0098] The connector used in this embodiment is a precision connector called a Pogo Pin, widely used in semiconductor devices, typically in precision connections in electronic products such as mobile phones, communications, automobiles, medical devices, and aerospace. Because a Pogo Pin is a very fine probe, its size can be made extremely small, thus reducing the weight of the connector, saving space, and improving the product's appearance. This spring-loaded probe is formed by riveting three basic components—a pin, a tube, and a spring—using precision instruments. It is also known as a spring pin, spring-loaded probe, or PogoPin connector. The bottom of the Pogo Pin's plunger is usually beveled. This bevel ensures that the plunger remains in contact with the inner wall of the tube during operation, allowing current to primarily flow through the gold-plated plunger and tube, ensuring the Pogo Pin's stability and low impedance.

[0099] (2) Contact point location distribution

[0100] like Figure 5 As shown, the anti-loss circuit is designed with positive and negative battery contact holes and a structural positioning hole, which correspond to the three spring pins on the power supply unit of the CD case. In use, the anti-loss CD is inserted into the CD case, and the three spring pins on the power supply unit make tight contact with the corresponding contact holes and positioning holes on the anti-loss CD, thus powering up the anti-loss circuit and enabling normal operation. Because the positions and angles of the three contact points are not uniformly distributed, effective positioning is ensured, preventing reverse polarity of the power supply.

[0101] II. Software Technical Solution of this Implementation Method

[0102] The software in this embodiment includes a mobile app and embedded software embedded in the short-range wireless communication chip. The implementation scheme adopted in this embodiment is a one-way "retrieval + broadcast" mode: the mobile app only performs scanning and detection, without involving data communication; it is only responsible for establishing connections with nodes with known identity IDs and determining whether the current connection is broken. The embedded software in the short-range wireless communication chip is only responsible for sending broadcast information with fixed content, providing its identity ID in a one-way, uninterrupted manner.

[0103] The above communication scheme ensures that the entire anti-loss system remains in a secure mode, eliminating the possibility of unauthorized intrusion or takeover of confidential data by other devices. The broadcast messages emitted by the anti-loss circuit remain unchanged and refuse to receive any external commands. As long as the system's power supply is not depleted, it will continuously send broadcast signals containing only ID information. The mobile app only parses the received broadcast signals, determining their amplitude and duration to determine whether to trigger an alert. Because of this one-way communication system, this system reliably prevents unauthorized intrusion into the communication link by third parties.

[0104] For mobile apps:

[0105] like Figure 6 As shown, after the mobile app is launched, it continuously searches for broadcast information about the anti-loss CD. From the list of found devices, it selects a device with a pre-determined ID and binds it. Simultaneously, the app continuously receives broadcast information from the bound anti-loss CD, dynamically refreshing and displaying the received signal strength. If the app detects that the bound anti-loss CD has not been detected within a preset time, it will control the phone to vibrate and ring continuously to remind the user that the confidential CD has been moved and is at risk of being lost.

[0106] The app can monitor multiple bound CDs simultaneously, displaying the name and signal strength of each monitored CD in the device list. When an alarm is triggered, a warning pop-up will appear, indicating which CD has lost signal. If the CD owner knows the CD's location, they can click to cancel the alarm and temporarily disable the app's monitoring function.

[0107] For embedded software:

[0108] Embedded software embedded within the chip ensures the anti-loss circuit always operates in unidirectional broadcast mode. In this mode, the on-chip signal processing circuitry masks all input signals, locking the communication mode to simplex mode, sending data but not receiving it. This effectively prevents attackers from unauthorized access to and modification of the broadcast content.

[0109] Meanwhile, the embedded software configures the chip to broadcast data at preset fixed intervals. This further reduces system power consumption and extends usage time.

[0110] The key point of this invention is that: 1. This invention couples the anti-loss circuit to the transparent ring area in the middle of the optical disc base to form an anti-loss optical disc;

[0111] 2. Compared to ordinary CDs, the height increase on the front of the anti-loss CD is no more than 0.6mm;

[0112] 3. This invention separates the power supply device and the anti-loss circuit in the system and assembles them in the optical disc case;

[0113] 4. The anti-loss CD is connected to the power supply device through three non-uniformly distributed anti-misinsertion contacts;

[0114] 5. After separating the anti-loss CD from the special CD case, the anti-loss system will enter a non-working state;

[0115] 6. This invention limits the anti-loss circuit to a one-way broadcast mode through hardware and software methods;

[0116] 7. This invention conceals the antenna design area visually by covering it with PCB-specific ink;

[0117] The embodiments of the present invention adjust the transmission power in real time through a dynamic low-power algorithm, and the system can work continuously for no less than 6 days.

[0118] Example 2

[0119] This invention provides an optical disc containing the components of Embodiment 1. The embodiments of this invention refer to Embodiment 1 in their specific implementation and achieve the corresponding technical effects.

[0120] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0121] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0122] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A system for preventing the loss of optical discs, characterized in that, The anti-loss system includes an anti-loss circuit and a monitoring module installed on the mobile terminal; the anti-loss circuit is coupled to a transparent ring area in the middle of the optical disc base, and the anti-loss circuit has a short-range wireless communication module for wireless communication with the monitoring module; the monitoring module is used to provide reminders according to a preset reminder method based on the wireless communication status. The anti-loss circuit includes components, an antenna, and a substrate; the substrate is a ring-shaped PCB, one side of the substrate serves as the antenna bearing surface, and the other side is used to mount the components; the antenna surface is coated with a coating material. The anti-loss system also includes a power supply device, which is located at the center of the optical disc case base and coincides with the center of the optical disc. The power supply device is equipped with three spring-type probes corresponding to the positive and negative contact holes and positioning holes of the battery; the anti-loss circuit is designed with positive and negative contact holes and positioning holes of the battery that are in close contact with the three spring-type probes.

2. The anti-loss system according to claim 1, characterized in that, The substrate has one or more of the following properties: The center of gravity of the substrate coincides with the center of gravity of the optical disc; The thickness of the substrate ensures that it can be properly inserted into an optical disc reader / writer after assembly with the optical disc. The weight of the substrate ensures that, after assembly with the optical disc, it will not cause the drive motor of the optical disc reader / writer to malfunction due to overload.

3. The anti-loss system according to claim 1, characterized in that, The components of the anti-loss circuit include a short-range wireless communication module, a clock crystal oscillator for providing the chip with the necessary operating parameters, and a decoupling capacitor for power supply filtering; the antenna is an arc-shaped irregular structure.

4. The anti-loss system according to any one of claims 1-3, characterized in that, The wireless communication between the monitoring module and the short-range wireless communication module adopts a unidirectional mode of retrieval plus broadcasting.

5. The anti-loss system according to claim 4, characterized in that, The short-range wireless communication module is specifically used to send broadcast information containing identification information in a one-way mode; the monitoring module is specifically used to start continuously searching for the broadcast information of optical discs after startup, and select the optical discs with pre-determined identification from the list of searched devices for binding. It continuously receives broadcast messages from the bound CDs and provides reminders according to preset reminder methods based on the received signal strength and whether broadcast messages are detected within a preset time.

6. An optical disc, characterized in that, The optical disc is equipped with an anti-loss system as described in any one of claims 1-5.

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