CN108931818B

CN108931818B - Anti-disassembly detecting device

Info

Publication number: CN108931818B
Application number: CN201710373598.2A
Authority: CN
Inventors: 阙郁智
Original assignee: Nanning Fugui Precision Industrial Co Ltd
Current assignee: Nanning Fulian Fugui Precision Industrial Co Ltd
Priority date: 2017-05-24
Filing date: 2017-05-24
Publication date: 2020-06-05
Anticipated expiration: 2037-05-24
Also published as: CN108931818A

Abstract

An anti-disassembly detecting device for detecting whether a housing of a product is disassembled, the anti-disassembly detecting device comprising: the circuit comprises a first detection circuit, a first shielding cover, a second detection circuit and a gate circuit. The first detection circuit is used for receiving the control signal and correspondingly outputting a first signal according to the first trigger signal. The first shielding cover is arranged in the first detection circuit and used for correspondingly shielding the first trigger signal according to the state that whether the shell is disassembled. The second detection circuit is used for receiving the control signal and correspondingly outputting a second signal according to a second trigger signal. The gate circuit, the first detection circuit and the second detection circuit are used for receiving the first signal and the second signal, forming the first signal and the second signal into a signal sequence, and outputting a detection signal with the shell detached when the signal sequence is judged to be different from the preset sequence. The anti-disassembly detection device provided by the invention can find whether the product shell is illegally opened in real time, thereby greatly ensuring the safety of the internal information of the product.

Description

Anti-disassembly detecting device

Technical Field

The present invention relates to a detection circuit, and more particularly to an anti-detachment detection device.

Background

In some products, in order to prevent lawless persons from stealing internal information of the products during working, structures for preventing users from disassembling the product shells are generally arranged. If set up the protector of some automatic re-setting contacts in the product, through the contact of protector and some other structures for the thick point of automatic re-setting is pressed or is bounced correspondingly, with after the shell is disassembled to the product, the protector control product is out of work, does not steal with corresponding information in the protection product, and nevertheless the protector structure is more complicated, and the precision of limiting a quantity is lower, poor stability, is unfavorable for protecting the product.

Disclosure of Invention

Accordingly, there is a need for an anti-disassembly detecting device to accurately detect whether a product is disassembled, so as to protect internal information of the product during operation.

The anti-disassembly detecting device provided by the embodiment of the invention is used for detecting whether the shell of a product is disassembled, and comprises: the circuit comprises a first detection circuit, a first shielding cover, a second detection circuit and a gate circuit. The first detection circuit is used for receiving the control signal and correspondingly outputting a first signal according to the first trigger signal. The first shielding cover is arranged in the first detection circuit and used for correspondingly shielding the trigger signal according to the state that whether the shell is disassembled. The second detection circuit is used for receiving the control signal and correspondingly outputting a second signal according to a second trigger signal. The gate circuit, the first detection circuit and the second detection circuit are used for receiving the first signal and the second signal, forming the first signal and the second signal into a signal sequence, and outputting a detection signal with the shell detached when the signal sequence is judged to be different from the preset sequence.

Preferably, the first detection circuit includes: a first signal transmitting circuit and a first signal receiving circuit. The first signal transmitting circuit is used for receiving the control signal and transmitting a first trigger signal. The first signal receiving circuit is used for receiving a first trigger signal to output a first signal.

Preferably, the first signal transmitting circuit includes: the LED comprises a first light emitting diode and a first triode. The anode of the first light emitting diode is electrically connected to the power supply through the first resistor and used for emitting a first trigger signal. The first conduction end of the first triode is electrically connected with the cathode of the first light emitting diode, the second conduction end of the first triode is electrically connected with the ground, the controlled end of the first triode is electrically connected with the ground through the second resistor, and the controlled end of the first triode is used for receiving a control signal.

Preferably, the first triode is an NPN-type triode, the first conducting end of the first triode is a collector, the second conducting end of the first triode is an emitter, and the controlled end of the first triode is a base.

Preferably, the first signal receiving circuit includes a first photodetector, a first conducting terminal of the first photodetector is electrically connected to the power supply through a third resistor, a second conducting terminal of the first photodetector is electrically connected to ground, a photodetector terminal of the first photodetector is configured to receive a second trigger signal, a first conducting terminal of the first photodetector serves as an output terminal of the first detecting circuit to output a first signal, when the first shielding cover does not shield the first trigger signal, the photodetector terminal receives the first trigger signal, and the first conducting terminal of the first photodetector is conducted with the second conducting terminal of the first photodetector.

Preferably, the second detection circuit includes: a second signal transmitting circuit and a second signal receiving circuit. The second signal transmitting circuit is used for receiving the control signal and transmitting a second trigger signal. The second signal receiving circuit is used for receiving a second trigger signal to output a second signal.

Preferably, the second signal transmitting circuit includes: a second light emitting diode and a second triode. The anode of the second light emitting diode is electrically connected to the power supply through the fourth resistor and used for emitting a second trigger signal. The first conduction end of the second triode is electrically connected with the cathode of the second light emitting diode, the second conduction end of the second triode is electrically connected with the ground, the controlled end of the second triode is electrically connected with the ground through a fifth resistor, and the controlled end of the second triode is used for receiving a control signal.

Preferably, the second triode is an NPN-type triode, the first conducting end of the second triode is a collector, the second conducting end of the second triode is an emitter, and the controlled end of the second triode is a base.

Preferably, the second signal receiving circuit includes a second photodetector, a first conducting terminal of the second photodetector is electrically connected to the power supply, a second conducting terminal of the second photodetector is electrically connected to ground through a sixth resistor, the photodetector of the second photodetector is configured to receive a second trigger signal, the second conducting terminal of the second photodetector serves as an output terminal of the second detecting circuit to output a second signal, and when the photodetector receives the second trigger signal, the first conducting terminal of the second photodetector is conducted to the second conducting terminal of the second photodetector.

Preferably, the gate circuit is an and circuit.

The anti-disassembly detection device provided by the invention can find whether the product shell is illegally opened in real time, thereby greatly ensuring the safety of the internal information of the product.

Drawings

Fig. 1 is a partial circuit diagram of an embodiment of an anti-detachment detection device according to the invention.

Fig. 2 is a partial circuit diagram of another embodiment of the tamper-proof detection device according to the present invention.

Fig. 3 is a schematic view of a light shield of an embodiment of the anti-detachment detection device of the invention.

Fig. 4 is a schematic view of a light shield according to another embodiment of the anti-detachment detection device of the present invention.

Fig. 5 is a circuit diagram of another embodiment of the tamper-proof detection device according to the present invention.

Fig. 6 is a schematic view of the anti-detachment detection device disposed on the PCB according to an embodiment of the present invention.

Description of the main elements

The first detection circuit A

Second detection circuit B

First shield In1

Shielding can In, In2

Gate circuit AND

Control signal CON

First signal V_OUT1

Second signal V_OUT2

Detecting signal V_{OUT_Y}

Power supply Vcc

First resistor R1

Second resistor R2

Third resistor R3

Fourth resistor R4

Fifth resistor R5

Sixth resistor R6

First light emitting diode D1

Second light emitting diode D2

First triode Q1

First photodetector Q2

Second triode Q3

Second photodetector Q4

Ground GND

Position Unit _ A, Unit _ B, Unit _ C

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The invention provides an anti-disassembly detection device which is used for detecting whether a shell of a product is disassembled or not. The anti-disassembly detecting device includes: a first detection circuit A, a first shield In1, a second detection circuit B AND a gate AND. The first detection circuit a is configured to receive the control signal CON and output a first signal V according to a first trigger signal F1_OUT1. The first shielding In1 is disposed In the first detection circuit a and is used for shielding the first trigger signal F1 according to a state that the housing is detached. The second detection circuit B is used for receiving the control signal CON and outputting a second signal V according to a second trigger signal F2_OUT2. The gate circuit AND is electrically connected with the first detection circuit A AND the second detection circuit B AND is used for receiving a first signal V_OUT1And a second signal V_OUT2And the first signal V is converted into the second signal V_OUT1And a second signal V_OUT2Forming a signal sequence, and outputting a detection signal V with the casing detached when the signal sequence is different from the predetermined sequence_{OUT_Y}。

The detailed implementation mode of the invention refers to the attached drawings and the following description.

Fig. 1 is a partial circuit diagram of an embodiment of an anti-detachment detection device according to the invention. Referring to fig. 1, a part of the circuit diagram in fig. 1 is used as the first detection circuit a of the present invention.

In this embodiment, the first detection circuit a includes: the first signal transmitting circuit and the first signal receiving circuit. The first signal transmitting circuit is configured to receive the control signal CON and transmit a first trigger signal F1. The first signal receiving circuit is configured to receive a first trigger signal F1 to output a first signal VOUT 1.

The first signal transmitting circuit comprises a first light emitting diode D1 and a first transistor Q1. The anode of the first light emitting diode D1 is electrically connected to the power Vcc through the first resistor R1, and is used for emitting the first trigger signal F1. A first conduction end of the first transistor Q1 is electrically connected to a cathode of the first light emitting diode D1, a second conduction end of the first transistor Q1 is electrically connected to ground GND, a controlled end of the first transistor Q1 is electrically connected to ground GND through the second resistor R2, and the controlled end of the first transistor Q1 is configured to receive the control signal CON.

The first signal receiving circuit includes a first photodetector Q2. The first conducting terminal of the first photo detector Q2 is electrically connected to a power source Vcc through a third resistor R3, the second conducting terminal of the first photo detector Q2 is electrically connected to ground GND, the photo detection terminal of the first photo detector Q2 is configured to receive a second trigger signal F2, and the first conducting terminal of the first photo detector Q2 is used as the output terminal of the first detection circuit a to output a first signal VOUT 1.

As shown In fig. 1, the first shielding In1 is disposed In the first detection circuit a, and can correspondingly affect the transmission and reception of the first trigger signal F1 In the first detection circuit a. When the high-level control signal CON is transmitted to the first signal transmitting circuit, the first transistor Q1 is turned on, the first light emitting diode D1 emits light normally, and when the first shielding cover In1 does not shield the first trigger signal F1, the photo detector receives the first trigger signal F1, and the first conducting terminal of the first photo detector Q2 is conducted with the second conducting terminal of the first photo detector Q2.

In this embodiment, the first transistor Q1 is an NPN transistor, and is mainly used as a switch for controlling the on/off of the circuit, so that when receiving the control signal CON, the circuit can be turned on, so that the first light emitting diode D1 can emit light normally. A first conducting terminal of the first transistor Q1 is a collector, a second conducting terminal of the first transistor Q1 is an emitter, and a controlled terminal of the first transistor Q1 is a base. In other embodiments, the type of the transistor may be changed according to the circuit form of the present invention, for example, a PNP type transistor is used, or a field effect transistor is directly used to achieve the function of the first transistor Q1 as a switch.

Fig. 2 is a partial circuit diagram of another embodiment of the tamper-proof detection device according to the present invention. Referring to fig. 2, a portion of the circuit diagram in fig. 2 is used as the second detection circuit B of the present invention.

In this embodiment, the second detection circuit B includes: second signal emitting powerAnd a second signal receiving circuit. The second signal transmitting circuit is configured to receive the control signal CON and transmit a second trigger signal F2. The second signal receiving circuit is used for receiving a second trigger signal F2 to output a second signal V_OUT2。

The second signal transmitting circuit comprises a second light emitting diode D2 and a second transistor Q3. The anode of the second light emitting diode D2 is electrically connected to the power Vcc through the fourth resistor R4, and is used for emitting the second trigger signal F2. A first conduction end of the second transistor Q3 is electrically connected to a cathode of the second light emitting diode D2, a second conduction end of the second transistor Q3 is electrically connected to ground GND, a controlled end of the second transistor Q3 is electrically connected to ground GND through a fifth resistor R5, and the controlled end of the second transistor Q3 is configured to receive the control signal CON.

In this embodiment, the second transistor Q3 is an NPN transistor, the first conducting terminal of the second transistor Q3 is a collector, the second conducting terminal of the second transistor Q3 is an emitter, and the controlled terminal of the second transistor Q3 is a base. In other embodiments, the type of the transistor may be changed according to the circuit form of the present invention, for example, a PNP type transistor is used, or a field effect transistor is directly used to achieve the function of the second transistor Q3 as a switch.

The second signal receiving circuit includes a second photo detector Q4, a first conducting terminal of the second photo detector Q4 is electrically connected to a power source Vcc, a second conducting terminal of the second photo detector Q4 is electrically connected to a ground GND through a sixth resistor R6, a photo detection terminal of the second photo detector Q4 is used for receiving a second trigger signal F2, and a second conducting terminal of the second photo detector Q4 is used as an output terminal of the second detection circuit B to output a second signal V_OUT2When the photo-detecting terminal receives the second trigger signal F2, the first conducting terminal of the second photo-detector Q4 is conducted with the second conducting terminal of the second photo-detector Q4. As shown In FIG. 2, when the emission of the second trigger signal F2 is blocked by no shield In2, the second signal V_OUT2Is high.

Referring to fig. 3 and 4 together, fig. 3 is a schematic view of a light shield of an embodiment of the tamper-proof detection device of the present invention, and fig. 4 is a schematic view of a light shield of another embodiment of the tamper-proof detection device of the present invention.

In the present embodiment, as shown In the figure, the first shield In1 can be designed as the shield In shown In fig. 3 and 4. The shield In is designed In the shape of an arch, and the shield In of fig. 3 and 4 is different In that the shield In of fig. 3 can block transmission of the trigger signal when the shield In of fig. 3 is disposed In the detection circuit, while the shield In of fig. 4 is used to confuse a user, that is, the shield In of fig. 4 does not block transmission of the trigger signal when the shield In of fig. 4 is disposed In the detection circuit. When the shielding can In of fig. 3 is disposed In the first detection circuit a or the second detection circuit, the transmission of the first trigger signal F1 or the second trigger signal F2 can be effectively blocked. This facilitates the disassembly of the product housing. When the housing of the product is disassembled, the housing may be provided with a plurality of bayonets or the like, and when the housing is disassembled, the bayonets may draw the shield case to move, so that the shield case In of each detection circuit is separated from the detection circuit. In appearance, the shielding cases In fig. 3 and 4 are the same, when the housing is disassembled, the fasteners are separated from the shielding cases, and at this time, the shielding cases are also separated from the detecting circuits, and the shielding cases are mixed together In a scattered manner. In the invention, the buckles arranged on the product shell can be In contact with a part of the shielding cover In when the shell is not disassembled, and when the shell is disassembled, the buckles on the shell can correspondingly drive the shielding cover In to be separated from each detection circuit, so that each detection circuit can detect that the shielding cover is separated out, and the product shell is judged to be disassembled.

Referring to fig. 5 and fig. 6, fig. 5 is a circuit schematic diagram of another embodiment of the tamper-proof detection device of the present invention. Fig. 6 is a schematic view of the anti-detachment detection device disposed on the PCB according to an embodiment of the present invention.

The disassembly prevention detection device includes a plurality of detection circuits, a plurality of shield cases, AND a gate AND. In the present embodiment, two first detection circuits a and one second detection circuit B are taken as an example for explanation, that is, two first detection circuits a and one second detection circuit B of the tamper-proof detection device of the present embodiment are taken as an example. The first detection circuit a and the second detection circuit B have the same connection relationship as described in the above embodiments, and are not described in detail here.

The input terminal of the first detection circuit a and the input terminal of the second detection circuit B are commonly connected to the output terminal of the CPU (not shown) for receiving the control signal CON. The output end of the first detection circuit a AND the output end of the second detection circuit B are commonly connected to the input ends of the gate AND, so that the gate AND can correspondingly receive the output signals of the detection circuits. Further, the gate circuit AND outputs the first signal V_OUT1And a second signal V_OUT2Forming a signal sequence, and outputting a detection signal V with the casing detached when the signal sequence is different from the predetermined sequence_{OUT_Y}. In this embodiment, the gate AND is an AND circuit, when the housing is not disassembled, the first detection circuit a is under the condition that the first shielding cover In1 covers, the first detection circuit a outputs a high level to the gate AND, the second detection circuit B is covered by the shielding cover In shown In fig. 4, but the second trigger signal F2 In the second detection circuit B can still normally transmit, the second detection circuit B also outputs a high level to the gate AND, at this time, the gate AND outputs a high level detection signal V_{OUT_Y}. In other embodiments, the gate circuit may be configured as an or gate circuit or other gate circuits.

Specifically, each of the detecting circuits is provided with a shielding case as shown in fig. 5, and two first detecting circuits a and one second detecting circuit B are randomly arranged in a position Unit _ A, Unit _ B, Unit _ C of the PCB shown in fig. 6. When the product housing is not disassembled, when the control signal CON is transmitted to each of the detecting circuits, the first trigger signals F1 of the two first detecting circuits a are all shielded by the first shielding cover In1, and the first signals V output by the two first detecting circuits a_OUT1Is high. The second trigger signal F2 of the second detection circuit B is not shielded by the shield In2, and the second signal V outputted by the second detection circuit B_OUT2Also high level, in this case, the gate circuit AND takes three high levels as a preset sequence, which is recorded as sequence 111AND outputs high level to CPU, AND then CPU makes product work normally. When the product housing is disassembled, the shielding cases In1 AND In2 of each detection circuit are separated from the detection circuit AND mixed together, AND when it is difficult for a thief to restore the corresponding shielding case to the corresponding detection circuit, the gate AND is difficult to form the sequence 111. When the detection circuit composition sequence is different from the preset sequence, the gate circuit AND outputs the low-level detection signal V_{OUT_Y}That is, the gate AND outputs the detection signal V at a low level_{OUT_Y}As the information that the shell is disassembled, the CPU is made to know that the shell is disassembled, so that the product can not work normally.

It is understood that various other changes and modifications may be made by those skilled in the art based on the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the claims of the present invention.

Claims

1. An anti-disassembly detecting device for detecting whether a housing of a product is disassembled, the anti-disassembly detecting device comprising:

the first detection circuit is used for receiving a control signal and correspondingly outputting a first signal according to a first trigger signal;

the first shielding cover is arranged in the first detection circuit and used for correspondingly shielding the first trigger signal according to the state that whether the shell is disassembled;

the second detection circuit is used for receiving the control signal and correspondingly outputting a second signal according to a second trigger signal;

the second shielding cover is arranged in the second detection circuit and does not shield the second trigger signal; and

and the gate circuit is electrically connected with the first detection circuit and the second detection circuit and is used for receiving the first signal and the second signal, forming the first signal and the second signal into a signal sequence, and outputting a detection signal with the shell detached when the signal sequence is judged to be different from a preset sequence.

2. The tamper-proof detection device of claim 1, wherein the first detection circuit comprises:

the first signal transmitting circuit is used for receiving the control signal and transmitting the first trigger signal; and

the first signal receiving circuit is used for receiving the first trigger signal to output the first signal.

3. The tamper-detection apparatus of claim 2, wherein the first signal transmitting circuit comprises:

the anode of the first light-emitting diode is electrically connected to a power supply through a first resistor and is used for emitting the first trigger signal; and

the first conduction end of the first triode is electrically connected with the cathode of the first light emitting diode, the second conduction end of the first triode is electrically connected with the ground, the controlled end of the first triode is electrically connected with the ground through a second resistor, and the controlled end of the first triode is used for receiving the control signal.

4. The device as claimed in claim 3, wherein the first transistor is an NPN transistor, the first conducting terminal of the first transistor is a collector, the second conducting terminal of the first transistor is an emitter, and the controlled terminal of the first transistor is a base.

5. The device as claimed in claim 2, wherein the first signal receiving circuit comprises a first photodetector, a first conducting terminal of the first photodetector is electrically connected to the power supply through a third resistor, a second conducting terminal of the first photodetector is electrically connected to ground, a light detecting terminal of the first photodetector is configured to receive the second trigger signal, the first conducting terminal of the first photodetector is used as an output terminal of the first detecting circuit to output the first signal, when the first shielding cover does not shield the first trigger signal, the light detecting terminal receives the first trigger signal, and the first conducting terminal of the first photodetector is electrically connected to the second conducting terminal of the first photodetector.

6. The tamper-proof detection device of claim 1, wherein the second detection circuit comprises:

the second signal transmitting circuit is used for receiving the control signal and transmitting the second trigger signal; and

and the second signal receiving circuit is used for receiving the second trigger signal to output the second signal.

7. The tamper-detection apparatus of claim 6, wherein the second signal transmitting circuit comprises:

the anode of the second light-emitting diode is electrically connected to the power supply through a fourth resistor and is used for emitting the second trigger signal; and

and a first conduction end of the second triode is electrically connected with the cathode of the second light emitting diode, a second conduction end of the second triode is electrically connected with the ground, a controlled end of the second triode is electrically connected with the ground through a fifth resistor, and the controlled end of the second triode is used for receiving the control signal.

8. The device according to claim 7, wherein the second transistor is an NPN transistor, the first conducting terminal of the second transistor is a collector, the second conducting terminal of the second transistor is an emitter, and the controlled terminal of the second transistor is a base.

9. The device as claimed in claim 6, wherein the second signal receiving circuit comprises a second photodetector, a first conducting terminal of the second photodetector is electrically connected to the power supply, a second conducting terminal of the second photodetector is electrically connected to ground through a sixth resistor, a photodetector terminal of the second photodetector is configured to receive the second trigger signal, a second conducting terminal of the second photodetector is used as an output terminal of the second detecting circuit to output the second signal, and when the photodetector terminal receives the second trigger signal, the first conducting terminal of the second photodetector is conducted to the second conducting terminal of the second photodetector.

10. The tamper-proof detection device as claimed in claim 1, wherein the first shield contacts with a latch in the housing when the housing is not disassembled, so that the latch drives the first shield to disengage from the first detection circuit when the housing is disassembled.