SBR sensor

Abstract

The utility model provides an SBR sensor. A first thin film layer, an insulating ventilation layer and a second thin film layer are all provided with pressure sensing areas. A plurality of sensing area through holes are formed in the part, located in the pressure sensing area, of the insulating ventilation layer; the first thin film layer and the second thin film layer are both provided with induction area conductive contacts in one-to-one correspondence with the induction area through holes, the insulating ventilation layer is further provided with a ventilation groove, and any induction area through hole is communicated with the ventilation groove; a leading-out wire, a ventilation catheter and a sleeve are arranged in the leading-out area; the lead-out wire is electrically connected with the conductive contact of the induction area; the ventilation guide pipe comprises a first ventilation opening and a second ventilation opening, the first ventilation opening is communicated with the ventilation groove, the sleeve comprises an air containing cavity, the second ventilation opening is communicated with the air containing cavity, the sensor is in a closed state in the whole process, good waterproof and dustproof performance is achieved, and the possibility of false alarm can be reduced while high sensitivity is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, and in particular to an SBR sensor. Background Technology

[0002] The Safety Belt Reminder (SBR) is a system that reminds the driver and front passenger when they are not wearing seat belts. The SBR sensor (also called a seat occupancy sensor) is a thin-film contact sensor. The SBR sensor's contacts are evenly distributed across the pressure-bearing surface of the seat. When someone is seated, the sensor receives external pressure and generates a trigger signal. When the controller receives this trigger signal and detects that someone is not wearing a seat belt, it issues a visual and audible alarm to remind the passenger to fasten their seat belt.

[0003] In one known technical solution, when the center of the SBR sensor contact is not under force, the contact is supported by double-sided adhesive around its perimeter. For the SBR sensor contact to conduct, air must be expelled from the contact area. This vent connects the sensor to the outside. Since the SBR sensor is typically installed on the foam inside the seat, in humid environments, this foam can absorb moisture, causing water to enter the SBR. Once water enters the SBR, the contact will conduct, triggering an alarm and affecting the user experience.

[0004] The purpose of this invention is to provide an SBR sensor to solve the problems existing in the prior art. It has a simple structure, good waterproof and dustproof performance, and can reduce the possibility of false alarms while ensuring high sensitivity. Utility Model Content

[0005] The purpose of this invention is to provide an SBR sensor to solve the problems existing in the prior art, which has good waterproof and dustproof performance, and can reduce the possibility of false alarms while ensuring high sensitivity.

[0006] To achieve the above objectives, this utility model provides the following solution: An SBR sensor is provided, comprising a first thin film layer, an insulating and ventilated layer, and a second thin film layer stacked sequentially; pressure sensing areas are provided on the first thin film layer, the insulating and ventilated layer, and the second thin film layer; the portion of the insulating and ventilated layer located in the pressure sensing area has multiple sensing area through holes; conductive contacts corresponding one-to-one with the sensing area through holes are provided on both the first and second thin film layers; the insulating and ventilated layer also has a venting groove, and any one of the sensing area through holes is connected to the venting groove; an output area is provided, comprising an output wire, a venting conduit, and a sleeve; the output wire is electrically connected to the conductive contacts of the sensing area; the venting conduit includes a first vent and a second vent, the first vent is connected to the venting groove, the sleeve includes a gas-containing cavity, and the second vent is connected to the gas-containing cavity.

[0007] Preferably, the conductive contacts of the sensing area on the first thin film layer are divided into a first sensing area contact and a second sensing area contact; the conductive contacts of the sensing area on the second thin film layer are third sensing area contacts; adjacent third sensing area contacts are electrically connected; the lead wires include a first lead wire and a second lead wire, the first lead wire is electrically connected to the first sensing area contact, and the second lead wire is electrically connected to the second sensing area contact.

[0008] Preferably, the first thin film layer, the insulating and ventilated layer, and the second thin film layer are all provided with a tail connection area. The tail connection area includes a first lead-out circuit and a second lead-out circuit. The two ends of the first lead-out circuit are electrically connected to the first sensing area contact and the first lead-out wire, respectively. The two ends of the second lead-out circuit are electrically connected to the second sensing area contact and the second lead-out wire, respectively. Both the first lead-out circuit and the second lead-out circuit are provided on the first thin film layer.

[0009] Preferably, the venting groove extends to the insulating venting layer located in the tail connection area, and the venting groove in the tail connection area is provided with a gas inlet, which communicates with the venting conduit.

[0010] Preferably, it further includes a terminal block, wherein the first lead-out circuit is electrically connected to the first lead-out wire through the terminal block, and the second lead-out circuit is electrically connected to the second lead-out wire through the terminal block.

[0011] Preferably, the sleeve is fitted over the outside of the lead wire and the ventilation duct.

[0012] Preferably, the end of the lead wire away from the terminal is connected to a connector, and the sleeve is located between the connector and the terminal.

[0013] Preferably, the conductive contact of the sensing area includes a silver paste conductive layer and a carbon paste protective coating.

[0014] Preferably, the insulating and ventilated layer is made of PET double-sided adhesive, and the first film layer and the second film layer are adhered to the PET double-sided adhesive.

[0015] Preferably, both the first film layer and the second film layer are PET films.

[0016] The present invention achieves the following technical advantages over the prior art:

[0017] 1. A first thin film layer and a second thin film layer are disposed in the pressure sensing area. The first and second thin film layers can be fixed on both sides of the insulating ventilated layer. When the SBR sensor is subjected to pressure, the gas in the sensing area through the through hole is discharged into the gas-bearing cavity in the sleeve through the vent groove. At this time, the entire sensor is always a fully sealed structure, and water and dust from the external environment will not enter the sensor. The conductive contacts of the sensing area on the first thin film layer abut against the conductive contacts of the sensing area on the second thin film layer, and a signal is sent out through the lead wire. When the pressure on the SBR sensor is removed, the air in the gas-bearing cavity of the sleeve flows freely in the vent groove and the sensing area through hole, causing the conductive contacts of the sensing areas on the first and second thin film layers to separate. Throughout the entire process, the sensor is always a fully sealed structure, preventing external moisture and dust from entering the sensor, and has excellent waterproof and dustproof performance, as well as high sensitivity and a low possibility of false alarms.

[0018] Other technical solutions of this utility model have also achieved the following technical effects:

[0019] 2. The first sensing area contact on the first thin film layer is connected to the first lead-out circuit, forming a first conductive layer on the first thin film layer; the second sensing area contact on the first thin film layer is connected to the second lead-out circuit, forming a second conductive layer on the first thin film layer. The first and second conductive layers are independent of each other. The third sensing area contacts on the second thin film layer are interconnected to form a third conductive layer. When the pressure sensing area is subjected to pressure, gas is discharged through the vent groove, and the first and second thin film layers deform. The sensing area conductive contacts on the first or second thin film layer can pass through the sensing area through-holes on the insulating vent layer. When at least one first sensing area contact and at least one second sensing area contact simultaneously abut against the third sensing area contact, the first, second, and third conductive layers are electrically connected, thereby electrically connecting the first and second conductive layers, generating a trigger signal. The trigger signal can be output through the first and second lead-out circuits. When the vehicle's main control system receives the trigger signal and detects that the occupant in the seat is not wearing a seatbelt, the main control system can issue visual and audible alarms to remind the passenger to fasten their seatbelt. In this invention, a trigger signal can only be emitted when the first sensing area contact and the second sensing area contact simultaneously come into contact with the third sensing area contact, thus ensuring high sensitivity while reducing the possibility of false alarms. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an exploded view of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the first conductive layer and the second conductive layer of this utility model;

[0023] Figure 3 This is a schematic diagram of the third conductive layer of this utility model;

[0024] Figure 4 This is a schematic diagram of the insulating and ventilated layer of this utility model;

[0025] Figure 5 This is a schematic diagram of the overall structure of this utility model.

[0026] The components are as follows: 1. Pressure sensing area; 2. First thin film layer; 3. Second thin film layer; 4. Insulating and venting layer; 5. Sensing area through hole; 6. Sensing area conductive contact; 7. Ventilation groove; 8. Ventilation duct; 9. Sleeve; 10. First sensing area contact; 11. Second sensing area contact; 12. Third sensing area contact; 13. First conductive layer; 14. Second conductive layer; 15. Tail connection area; 16. First lead-out circuit; 17. Second lead-out circuit; 18. Terminal block; 19. Connector; 20. Silver paste conductive layer; 21. Carbon paste protective coating; 22. Hot melt adhesive block; 23. Third conductive layer; 24. Lead-out wire. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Please refer to Figure 1-5 As shown, this embodiment provides an SBR sensor, including a first thin film layer 2, an insulating and ventilated layer 4, and a second thin film layer 3 stacked sequentially. Pressure sensing areas 1 are provided on the first thin film layer 2, the insulating and ventilated layer 4, and the second thin film layer 3. At least one sensing area through-hole 5 is formed on the insulating and ventilated layer 4 within the pressure sensing area 1. Preferably, the sensing area through-holes 5 are arranged in a dot matrix on the insulating and ventilated layer 4, which is made of insulating material and can insulatingly separate the first thin film layer 2 and the second thin film layer 3. Sensing area conductive contacts 6 are provided on both the first thin film layer 2 and the second thin film layer 3, and each sensing area conductive contact 6 corresponds one-to-one with the sensing area through-hole 5. Ventilation grooves 7 are also formed on the insulating and ventilated layer 4, and any through-hole is connected to a ventilation groove 7. The SBR sensor also includes a lead-out area, in which lead-out wires 24, ventilated conduits 8, and sleeves 9 are provided. The lead-out wires 24 are electrically connected to the sensing area conductive contacts 6. Electrical connection to the outside world can be achieved through the lead-out wires 24. The venting conduit 8 includes a first vent and a second vent. The first vent communicates with the venting groove 7, and the second vent communicates with the air-containing cavity in the sleeve 9. Preferably, the sleeve 9 has a closed structure, the air-containing cavity is located inside the sleeve 9, and the volume of the air-containing cavity is much larger than the combined volume of the sensing area through hole 5 and the venting groove 7. That is, the volume of the air-containing cavity inside the sleeve 9 is much larger than the exhaust volume of the conductive contact 6 in the sensing area when it is in contact.

[0030] Working principle: A first thin film layer 2 and a second thin film layer 3 are disposed in the pressure sensing area 1. The first thin film layer 2 and the second thin film layer 3 can be fixed on both sides of the insulating ventilated layer 4, for example, by adhesive bonding, separating the first thin film layer 2 and the second thin film layer 3 to create a certain gap between them. When the SBR sensor is subjected to pressure, the gas in the sensing area through hole 5 is discharged into the gas-bearing cavity in the sleeve 9 through the vent groove 7. At this time, the entire sensor is always a fully sealed structure, and water and dust from the external environment will not enter the sensor. The conductive contact 6 of the sensing area on the first thin film layer 2 abuts against the conductive contact 6 of the sensing area on the second thin film layer 3, and sends a signal outward through the lead wire 24. When the pressure on the SBR sensor disappears, the air in the gas-bearing cavity of the sleeve 9 flows freely in the vent groove 7 and the sensing area through hole 5, causing the conductive contacts 6 of the sensing areas on the first thin film layer 2 and the second thin film layer 3 to separate. Throughout the process, the sensor remains fully sealed, preventing external moisture and dust from entering it. It boasts excellent waterproof and dustproof performance, high sensitivity, and a low probability of false alarms.

[0031] In one embodiment, the conductive contacts 6 of the sensing area on the first thin film layer 2 are divided into a first sensing area contact 10 and a second sensing area contact 11, and the first sensing area contact 10 and the second sensing area contact 11 are independent of each other; the conductive contacts 6 of the sensing area on the second thin film layer 3 are third sensing area contacts 12, adjacent third sensing area contacts 12 are electrically connected, and multiple third sensing area contacts 12 are electrically connected to form a third conductive layer 23. The lead wire 24 also includes a first lead wire and a second lead wire, the first lead wire is electrically connected to the first sensing area contact 10, and the second lead wire is electrically connected to the second sensing area contact 11.

[0032] The SBR sensor also includes a rear connection area 15, in which a first lead-out circuit 16 and a second lead-out circuit 17 are disposed. The first lead-out circuit 16 is connected to the first sensing area contact 10 to form a first conductive layer 13, and the second lead-out circuit 17 is connected to the second sensing area contact 11 to form a second conductive layer 14. The first conductive layer 13 and the second conductive layer 14 are independent of each other. The other end of the first lead-out circuit 16 is electrically connected to the first lead wire, and the other end of the second lead-out circuit 17 is connected to the second lead wire. The first lead wire and the second lead wire can be connected to the main control system of the vehicle. Preferably, one end face of the sensing area through hole 5 is strictly aligned with the first sensing area contact 10 and the second sensing area contact 11, and the other end face is strictly aligned with the third sensing area contact 12. The main bodies of the first sensing area contact 10, the second sensing area contact 11, and the third sensing area contact 12 are all circular and of equal size. The sensing area through hole 5 is also a circular through hole, and the diameter of the sensing area through hole 5 is smaller than the diameter of the first sensing area contact 10, the second sensing area contact 11, and the third sensing area contact 12, ensuring that only the sensing area conductive contact 6 can enter the sensing area through hole 5.

[0033] Working principle: The first sensing area contact 10 on the first thin film layer 2 is connected to the first lead-out circuit 16, forming a first conductive layer 13 on the first thin film layer 2; the second sensing area contact 11 on the first thin film layer 2 is connected to the second lead-out circuit 17, forming a second conductive layer 14 on the first thin film layer 2. The first conductive layer 13 and the second conductive layer 14 are independent of each other. The third sensing area contacts 12 on the second thin film layer 3 are interconnected to form a third conductive layer 23. When the pressure sensing area 1 is subjected to pressure, the gas in the SBR sensor is discharged through the vent groove 7 into the gas-containing cavity in the sleeve 9. The first thin film layer 2 and the second thin film layer 3 deform. The sensing area conductive contact 6 on the first thin film layer 2 or the second thin film layer 3 can be made to contact the sensing area conductive contact 6 on the first thin film layer 2 and the sensing area conductive contact 6 on the second thin film layer 3 through the sensing area through hole 5 on the insulating vent layer 4. When at least one first sensing area contact 10 and at least one second sensing area contact 11 simultaneously abut against the third sensing area contact 12, the first conductive layer 13, the second conductive layer 14 and the third conductive layer 23 are electrically connected, thereby making the first conductive layer 13 and the second conductive layer 14 electrically connected, generating a trigger signal. The trigger signal can be transmitted to the main control system of the car through the first lead-out circuit 16 and the second lead-out circuit 17. When the main control system receives the trigger signal and detects that the person in the seat is not wearing a seat belt, the main control system can issue a visual and audible alarm to remind the passenger to fasten the seat belt. In this invention, the distribution of the conductive contacts 6 in the sensing area is more in line with the human body structure and force characteristics. A trigger signal can only be emitted when the first sensing area contact 10 and the second sensing area contact 11 simultaneously abut against the third sensing area contact 12, ensuring high sensitivity while reducing the possibility of false alarms. When the pressure is removed and the contacts are no longer under pressure, the airflow in the gas-bearing cavity of the sleeve 9 flows freely through the venting groove 7. The airflow enters the SBR sensor, filling the sensing area through-hole 5, thus separating the conductive contacts 6 in the sensing area on the first thin film layer 2 from those on the second thin film layer 3. Preferably, the first thin film layer 2 and the second thin film layer 3 have a certain degree of elasticity. When the pressure sensing area 1 is subjected to pressure, the deformation of the first thin film layer 2 and the second thin film layer 3 is elastic deformation. When the pressure disappears, air re-enters the sensing area through-hole 5 through the venting groove 7, simultaneously restoring the deformation of the first thin film layer 2 and the second thin film layer 3, thus separating the contacts on the first thin film layer 2 and the second thin film layer 3.

[0034] In one embodiment, multiple first sensing area contacts 10 and second sensing area contacts 11 are provided, and the first sensing area contacts 10 and second sensing area contacts 11 are evenly distributed. Preferably, the first sensing area contacts 10 and second sensing area contacts 11 are arranged alternately in the horizontal direction. Adjacent first sensing area contacts 10 are electrically connected to each other and to the first lead-out circuit 16, and adjacent second sensing area contacts 11 are electrically connected and to the second lead-out circuit 17.

[0035] In one embodiment, a tail connection region 15 is provided on the first thin film layer 2, the second thin film layer 3, and the insulating venting layer 4. The first lead-out circuit 16 and the second lead-out circuit 17 are both located in the portion of the first thin film layer 2 located in the tail connection region 15. The venting groove 7 on the insulating venting layer 4 in the pressure sensing region 1 can extend to and penetrate the insulating venting layer 4 located in the tail connection region 15. The exhaust end of the venting groove 7 is connected to a venting conduit 8, through which air in the SBR sensor can be discharged to the outside.

[0036] In one embodiment, the leads of the first lead-out circuit 16 and the second lead-out circuit 17 are connected to terminals 18, which are also film terminals. The leads of terminals 18 are connected to lead wires 24, through which signals can be transmitted outwards. A sleeve 9 is fitted over both the vent duct 8 and the lead wires 24. The sleeve 9 is preferably made of PVC, forming a PVC sleeve, specifically a PVC heat-shrink sleeve. The two ends of the PVC heat-shrink sleeve shrink under heat to wrap around the lead wires 24 and the vent duct 8, thus providing organization and protection for the vent duct 8 and the lead wires 24. Preferably, the first lead-out circuit 16 and the second lead-out circuit 17 are electrically connected to the terminals 18, and a hot melt adhesive block 22 is formed on the outside of the terminals 18. The hot melt adhesive block 22 can wrap the terminals 18, providing waterproofing and dustproofing, and also making the connection between the terminals 18 and the first lead-out circuit 16 and the second lead-out circuit 17 more secure.

[0037] In this embodiment, a connector 19 is provided at the end of the lead wire 24 away from the terminal 18. The connector 19 can be connected to the connector of the vehicle body or other equipment to transmit current signals. The sleeve 9 is located between the connector 19 and the terminal 18.

[0038] In one embodiment, the conductive contact 6 in the sensing area is composed of a silver paste conductive layer 20 and a carbon paste protective coating 21. Preferably, the silver paste conductive layer 20 is directly disposed on the first thin film layer 2 and the second thin film layer 3, and the carbon paste protective coating 21 is then disposed on the silver paste conductive layer 20. The connection between adjacent contacts is also composed of the silver paste conductive layer 20 and the carbon paste protective coating 21. Furthermore, the first conductive layer 13 and the second conductive layer 14 are also both composed of the silver paste conductive layer 20 and the carbon paste protective coating 21.

[0039] In one embodiment, the insulating and ventilating layer 4 is made of PET double-sided adhesive. The first film layer 2 and the second film layer 3 are adhered to the PET double-sided adhesive. The through-holes in the insulating and ventilating layer 4 are perforated and no double-sided adhesive is used. Both the first film layer 2 and the second film layer 3 are made of PET material, and both are PET films.

[0040] It should be noted that, for those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An SBR sensor, characterized in that, It includes a first thin film layer (2), an insulating and ventilated layer (4), and a second thin film layer (3) stacked in sequence; each of the first thin film layer (2), the insulating and ventilated layer (4), and the second thin film layer (3) is provided with a pressure sensing area (1); The insulating ventilated layer (4) located in the pressure sensing area (1) has multiple sensing area through holes (5); the first thin film layer (2) and the second thin film layer (3) are each provided with sensing area conductive contacts (6) corresponding to the sensing area through holes (5); the insulating ventilated layer (4) is also provided with a ventilation groove (7); any one of the sensing area through holes (5) is connected to the ventilation groove (7); The lead-out area is provided with a lead-out wire (24), a ventilation duct (8), and a sleeve (9); the lead-out wire (24) is electrically connected to the conductive contact (6) of the sensing area; the ventilation duct (8) includes a first ventilation port and a second ventilation port, the first ventilation port is connected to the ventilation groove (7), the sleeve (9) includes a gas-containing cavity, and the second ventilation port is connected to the gas-containing cavity.

2. The SBR sensor according to claim 1, characterized in that, The conductive contacts (6) of the sensing area on the first thin film layer (2) are divided into a first sensing area contact (10) and a second sensing area contact (11); the conductive contacts (6) of the sensing area on the second thin film layer (3) are a third sensing area contact (12); adjacent third sensing area contacts (12) are electrically connected; the lead wire (24) includes a first lead wire and a second lead wire, the first lead wire is electrically connected to the first sensing area contact (10), and the second lead wire is electrically connected to the second sensing area contact (11).

3. The SBR sensor according to claim 2, characterized in that, Tail connection area (15) is provided on the first thin film layer (2), the insulating and ventilated layer (4) and the second thin film layer (3). The tail connection area (15) includes a first lead-out circuit (16) and a second lead-out circuit (17). The two ends of the first lead-out circuit (16) are electrically connected to the first sensing area contact (10) and the first lead-out wire, respectively. The two ends of the second lead-out circuit (17) are electrically connected to the second sensing area contact (11) and the second lead-out wire, respectively. The first lead-out circuit (16) and the second lead-out circuit (17) are both provided on the first thin film layer (2).

4. The SBR sensor according to claim 3, characterized in that, The ventilation groove (7) extends to the insulating ventilation layer (4) located in the tail connection area (15), and the ventilation groove (7) in the tail connection area (15) is provided with a gas port, which is connected to the ventilation duct (8).

5. The SBR sensor according to claim 3, characterized in that, It also includes a terminal block (18), through which the first lead-out circuit (16) is electrically connected to the first lead-out wire, and through which the second lead-out circuit (17) is electrically connected to the second lead-out wire.

6. The SBR sensor according to claim 1, characterized in that, The sleeve (9) is fitted over the outside of the lead wire (24) and the ventilation duct (8).

7. The SBR sensor according to claim 5, characterized in that, The end of the lead wire (24) away from the terminal (18) is connected to a connector (19), and the sleeve is located between the connector (19) and the terminal (18).

8. The SBR sensor according to claim 1, characterized in that, The conductive contact (6) in the sensing area includes a silver paste conductive layer (20) and a carbon paste protective coating (21).

9. The SBR sensor according to claim 1, characterized in that, The insulating and ventilated layer (4) is made of PET double-sided adhesive, and the first film layer (2) and the second film layer (3) are adhered to the PET double-sided adhesive.

10. The SBR sensor according to claim 9, characterized in that, Both the first film layer (2) and the second film layer (3) are PET films.

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