New occupant pressure sensor

Abstract

Novel occupant pressure sensor, characterized in that the novel occupant pressure sensor comprises: a detection film unit (1), wherein the detection film unit (1) comprises a first film layer (13), a spacer layer (14) and a second film layer (15) arranged sequentially; wherein a conductive material (12) is arranged on one side of the first film (13) and the second film (14) near the spacer layer (14), wherein one end of the first film layer (13) extends outwards along a longitudinal direction of the detection film unit (1) and an electrical connection area (11) is formed at its terminal end, which is exposed outside the spacer layer (14) and the second film layer (15), wherein the electrical connection area (11) has at least two circuit terminals (111); an electrical connection unit (2), wherein the electrical connection unit (2) comprises a printed circuit board structure (21) at one end of the electrical connection unit (2); wherein at least two first conductive parts (23) are arranged on the printed circuit board structure (21); wherein the printed circuit board structure (21) is fixed to the electrical connection area (11) via at least one fixing structure (3), such that the first conductive parts (23) are each in contact with the circuit terminals (111), thereby establishing a conductive connection between the detection film unit (1) and the electrical connection unit (2) and forming a detection circuit.

Description

TECHNICAL AREA

[0001] The present disclosure relates generally to the technical field of a car seat, in particular a novel occupant pressure sensor. STATE OF THE ART

[0002] Currently, vehicles such as cars are equipped with occupancy sensors that automatically detect the presence of drivers and passengers in the vehicle seats and can distinguish objects from people, and serve to provide seat occupancy signals to various devices.

[0003] The occupant pressure sensor for a car seat on the market is primarily a membrane switch structure. The product performs a detection function by connecting a detection film unit to a wiring harness. Currently, the detection film unit and the wiring harness are mainly assembled and connected using crimp connectors, and then a resistor module is installed according to a detection point circuit.

[0004] However, this leads to a very complicated assembly step, which is detrimental to the production efficiency and automation of occupant pressure sensors. When manufacturing products with resistive components, metal foil ceramic resistors are typically used. However, these resistors, despite having the same power rating and different resistance values, essentially have the same external dimensions, frequently leading to handling errors and product failure. A novel occupant pressure sensor is proposed to address this issue. ILLUSTRATION OF THE USE SAMPLE

[0005] In view of the aforementioned defects or shortcomings in the prior art, it is desirable to provide a novel occupant pressure sensor that reduces the error rate when using external resistors and is easy to manufacture.

[0006] The present application provides a novel occupant pressure sensor comprising: a detection film unit, the detection film unit comprising a first film layer, a spacer layer and a second film layer arranged sequentially; wherein a conductive material is arranged on one side of the first film and the second film near the spacer layer, wherein one end of the first film layer extends outwards along a longitudinal direction of the detection film unit and an electrical connection area is formed at its terminal end, which is exposed outside the spacer layer and the second film layer, wherein the electrical connection area has at least two circuit terminals; an electrical connection unit, wherein the electrical connection unit comprises a printed circuit board structure at one end of the electrical connection unit; wherein at least two first conductive parts are arranged on the printed circuit board structure; wherein the printed circuit board structure is fixed to the electrical connection area via at least one fixing structure, such that the first conductive parts are each in contact with the circuit terminals, thereby establishing a conductive connection between the detection film unit and the electrical connection unit and forming a detection circuit.

[0007] According to a technical solution provided by the present application, at least one first connection hole is provided in the electrical connection area; and The printed circuit board structure has at least one second connection hole, wherein the second connection hole is arranged correspondingly to the first connection hole; and the second connection hole and the first connection hole serve, in conjunction with the fixing structure, to fix the detection film unit and the electrical connection unit.

[0008] According to a technical solution provided by the present application, the fixing structure is a rivet or a bolt-nut or a bayonet fitting or a connector or a clamp.

[0009] According to a technical solution provided by the present application, the fixing structure has a fixing surface which is in contact with an upper surface of the first film layer, wherein a buffer structure is arranged on the fixing surface.

[0010] According to a technical solution provided by the present application, the printed circuit board structure is a printed circuit board or a flexible printed circuit board.

[0011] According to a technical solution provided by the present application, a predetermined resistance module is arranged on the printed circuit board structure.

[0012] According to a technical solution provided by the present application, at least two second conductive parts are also arranged on the printed circuit board structure, wherein the second conductive parts serve to be conductively connected to external electrical components via a cable harness or a connection.

[0013] According to a technical solution provided by the present application, the first conductive part, the specified resistance module and the second conductive part can be distributed on the same side of the printed circuit board structure, or one of them can be distributed on one side and the other two can be distributed on the other side of the printed circuit board structure.

[0014] According to a technical solution provided by the present application, an edge of the spacer layer extends on one side near the electrical connection area along the longitudinal direction of the detection film unit, forming an extension section that projects beyond the length of the second film layer; wherein an edge of the printed circuit board structure is arranged on one side near the first film layer in conjunction with the extension section to reduce damage to the printed circuit board structure and the detection film unit.

[0015] According to a technical solution provided by the present application, the novel occupant pressure sensor also comprises a protective housing; wherein the printed circuit board structure, a connection point between the printed circuit board structure and the detection film unit, and a connection point between the printed circuit board structure and the cable harness are all arranged within the protective housing, the protective housing serving to protect a connection stability between the printed circuit board structure and the detection film unit.

[0016] In summary, these technical solutions specifically disclose a novel occupant pressure sensor. The occupant pressure sensor comprises a detection film unit and an electrical connection unit, wherein the detection film unit comprises a first film layer, a spacer layer, and a second film layer arranged sequentially; wherein a conductive material is arranged on one side of both the first film and the second film near the spacer layer; wherein one end of the first film layer extends outward along a longitudinal direction of the detection film unit and forms an electrical connection area at its terminal end, which is exposed outside the spacer layer and the second film layer, and wherein the electrical connection area has at least two circuit terminals; wherein the electrical connection unit comprises a printed circuit board structure at one end of the electrical connection unit.wherein at least two first conductive parts are arranged on the printed circuit board structure; wherein the printed circuit board structure is fixed to the electrical connection area via at least one fixing structure, such that the first conductive parts are each in contact with the circuit terminals, thereby establishing a conductive connection between the detection film unit and the electrical connection unit and forming a detection circuit.

[0017] In the production of products with resistance modules for existing occupant pressure sensors, the detection film unit and the wiring harness are primarily assembled and connected by crimping. This results in a very complex assembly process and is not advantageous for fully automated manufacturing. In contrast, the printed circuit board structure in the electrical connection unit of the present application functions as a conductive component and is fixed to the first conductive parts and the circuit connections in the detection film unit by means of a fixing structure. This enables contact and a conductive connection between the detection film unit and the electrical connection unit, significantly improving the simplicity and efficiency of assembly and also being more advantageous for the design of a fully automated manufacturing process. BRIEF DESCRIPTION OF THE FIGURES

[0018] Further features, functions and advantages of the present application will become clearer by reading the detailed description of the non-restrictive embodiments with reference to the following accompanying drawings. It shows: Fig. 1 a structural schematic representation of a novel occupant pressure sensor; Fig. 2 a schematic representation of the assembly of a detection film unit and a PCB circuit board in a novel occupant pressure sensor; Fig. 3 a structural schematic representation of the detection film unit in a novel occupant pressure sensor; Fig. 4 a structural schematic representation of a printed circuit board structure in a novel occupant pressure sensor; Fig. 5 a schematic representation of the use of a first fixing structure in a novel occupant pressure sensor; Fig. 6 a schematic representation of the use of a second fixing structure in a novel occupant pressure sensor; Fig. 7 a schematic representation of a first buffer structure corresponding to the fixing structure in a novel occupant pressure sensor; Fig. 8 a schematic representation of a second buffer structure corresponding to the fixing structure in a novel occupant pressure sensor; Fig. 9 a schematic representation of a third buffer structure corresponding to the fixing structure in a novel occupant pressure sensor; Fig. 10 a schematic representation of the assembly of a third buffer structure corresponding to the fixing structure in a novel occupant pressure sensor; Fig. 11 a schematic representation of a first film layer in a novel occupant pressure sensor in a first state; Fig. 12 a schematic representation of the first film layer in a novel occupant pressure sensor in a second state; Fig. 13 a schematic representation of the first film layer in a novel occupant pressure sensor in a third state; Fig. 14 a schematic representation of a first printed circuit board structure in a novel occupant pressure sensor; Fig. 15 a circuit diagram that corresponds to the first printed circuit board structure; Fig. 16 a schematic representation of a second printed circuit board structure in a novel occupant pressure sensor; Fig. 17 a circuit diagram that corresponds to the second printed circuit board structure; Fig. 18 a schematic representation of a third printed circuit board structure in a novel occupant pressure sensor; Fig. 19 a circuit diagram corresponding to the third printed circuit board structure; Fig. 20 a schematic representation of a novel occupant pressure sensor as a whole. Reference symbol list: 1 detection film unit 11 electrical connection area 12 conductive material 111 Circuit connection 13 first foil layer 14 spacer layer 141 Extension section 15 second foil layer 16 printed conductor layer 17 first connecting hole 2 electrical connection units 21 Printed circuit board structure 22 specified resistance module 23 first conductive part 24 second connecting hole 25 second conductive part 26 Signal line section 5 Wiring harness 6 Control 3 Fixing structure 31 Buffer structure 4 protective housings DESCRIPTION OF THE EXECUTION FORMS

[0019] The present application is explained in more detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein serve only to interpret the invention and do not constitute a limitation of that invention. It should also be noted that, for the sake of clarity, only the parts dependent on the invention are shown in the accompanying drawings.

[0020] It should be noted that the embodiments and features in the embodiments in the present application may be combined with one another as long as there is no conflict. The present application is explained in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0021] Reference is made to a structural schematic representation of a novel occupant pressure sensor provided by the present embodiments and a schematic representation of the assembly of a detection film unit and a PCB circuit board, as shown in Fig. 1 and Fig. 2 are shown. To solve the problems of complex assembly and frequent misuse of external resistors, which can easily lead to product failure, in existing occupant pressure sensors, the embodiments of the present application provide a novel occupant pressure sensor comprising: a detection film unit 1, wherein the detection film unit 1 comprises a first film layer 13, a spacer layer 14 and a second film layer 15 arranged one after the other; wherein a conductive material 12 is arranged on one side of the first film 13 and the second film 14 near the spacer layer 14, wherein one end of the first film layer 13 extends outwards along a longitudinal direction of the detection film unit 1 and an electrical connection area 11 is formed at its terminal end, which is exposed outside the spacer layer 14 and the second film layer 15, wherein the electrical connection area 11 has at least two circuit terminals 111; an electrical connection unit 2, wherein the electrical connection unit 2 comprises a printed circuit board structure 21 at one end of the electrical connection unit 2; wherein at least two first conductive parts 23 are arranged on the printed circuit board structure 21; wherein the printed circuit board structure 21 is fixed to the electrical connection area 11 via at least one fixing structure 3, such that the first conductive parts 23 are each in contact with the circuit terminals 111, thereby establishing a conductive connection between the detection film unit 1 and the electrical connection unit 2 and forming a detection circuit.

[0022] The occupant pressure sensor serves to automatically detect the presence of drivers and passengers in vehicle seats and can distinguish objects from people, e.g., as a warning system for unfastened seat belts, a vehicle safety system, or a comfort adjustment system, etc. In this embodiment, the occupant sensor primarily comprises two main parts: the detection film unit 1 and the electrical connection unit 2.The detection film unit 1 comprises a first film layer 13, a spacer layer 14 and a second film layer 15, which are arranged one after the other, wherein on one side of the first film 13 and the second film 14 near the spacer layer 14 a conductive material 12 is arranged, which corresponds to a circuit switch structure on the two film layers and serves to establish a contact between two electrodes at corresponding film induction positions when pressure is applied to the detection film unit 1 and then to establish a conductive connection.

[0023] Furthermore, an electrical connection area 11 is formed at one end of the detection film unit 1, which is exposed outside the spacer layer 14 and the second film layer 15. The electrical connection area 11 serves to establish a contact-based electrical connection with the electrical connection unit 2, thus forming a conductive detection circuit. The electrical connection area 11 has two mutually insulated circuit terminals 111 made of the conductive material 12. The conductive material 12 can be a silver layer and a carbon layer, the carbon layer effectively protecting the silver layer from oxidation. Additionally, the conductive material 12 can also be composed of other conductive substances.

[0024] Next, at least two mutually insulated first conductive parts 23 are arranged on the printed circuit board structure 21 at one end of the electrical connection unit 2. The two first conductive parts 23 are each brought into contact with and fixed to the circuit terminals 111 via a fixing structure 3. Thus, once contact and a conductive connection have been established between the first conductive parts 23 and the circuit terminals 111, a conductive connection between the detection film unit 1 and the electrical connection unit 2 is already established, thereby forming a detection circuit. The first conductive part 23 can be in the form of a coating of conductive material or a terminal fixed to the printed circuit board structure 21.

[0025] It should be explained that the aforementioned "film induction position" refers specifically to a position on the spacer layer 14 where at least one through-hole is provided. In a practical application scenario, the conductive material 12 on the first film 13 and the conductive material 12 on the second film 14 come into contact with each other in at least one through-hole when the first film 13 is subjected to a transmitted external pressure, thereby establishing contact and subsequently the conductive connection at the film induction positions. In this case, this corresponds to a conductive state of the circuit switch on the detection film unit 1. If the detection film unit 1 and the electrical connection unit 2 are also conductively connected, then the entire detection circuit is conductive and can output a corresponding electrical signal externally.

[0026] In a preferred embodiment, at least one first connecting hole 17 is provided at the circuit terminal, as shown in Fig. 13, Fig. 15, Fig. 17 and Fig. 19 shown; and On the printed circuit board structure 21, at least one second connecting hole 24 is provided, wherein the second connecting hole 24 is arranged correspondingly to the first connecting hole 17; and the second connecting hole 24 and the first connecting hole 17 serve, in conjunction with the fixing structure 3, to fix the detection film unit 1 and the electrical connecting unit 2.

[0027] The first connecting hole 17 can be cut using processing equipment such as a punching machine, a laser machine, or a vibratory cutter, whereby a single hole can be cut multiple times or several holes can be cut at once. If the first connecting hole 17 is cut with a fully automatic punching machine in the actual cutting process, the device automatically tracks the marking symbols (the marking symbols can be a "cross", "dot", or "Torx") on the first film layer 13 to ensure the accuracy of the film punching. It is specifically designed for the Fig. 11 and Fig. 12. To refer to the depicted form of the marking symbols.

[0028] Simultaneously, a second connection hole 24, corresponding to the first connection hole 17, must also be planned on the printed circuit board structure 21. After providing the second connection hole 24, space is reserved around the hole for the arrangement of the first conductive part 23, so that the fixing structure 3 can be successively passed through the second connection holes 24, which correspond to the first connection holes 17, in order to fix the electrical connection area 11 to the printed circuit board structure 21.

[0029] In a preferred embodiment, the fixing structure 3 is a rivet or a bolt-nut or a screw or a bayonet fitting or a connector or a clamp.

[0030] Since the printed circuit board structure 21 and the electrical connection area 11 are conductively connected by contact, the printed circuit board structure 21 and the electrical connection area 11 must be fixed to one another by means of the fixing structure 3, which further improves the ease of assembly. For example, the fixing structure 3 can be in any form of fixing component such as a rivet, bolt-nut, bayonet fitting, connector, or clamp. The form of rivet or bolt-nut is specified in Fig. 5 and Fig. Figure 6 illustrates that the fixing structure 3 firmly connects the detection film unit 1 and a circuit connection unit 2 by pressing and fixing, whereby the specific form is not limited to the example structure mentioned above, but can be adapted depending on the actual production process.

[0031] If a rivet is used as the fixing structure, it can be hollow or solid and made of a metallic or non-metallic material. The rivet can be installed by turning or pressing. With a non-metallic material, installation by ultrasonic welding is also possible, although there are no specific definitions for this method.

[0032] In a preferred embodiment, the fixing structure 3, as shown in Fig. Figures 7-10 show a fixing surface which is in contact with an upper surface of the first film layer 13, wherein a buffer structure 31 is arranged on the fixing surface.

[0033] The buffer structure 31 is arranged on an end surface of the fixing structure 3 that must come into contact with the first film layer 13. Its purpose is to reduce damage and destruction of the first film layer 13 by the fixing structure 3 during the bonding process and to prevent the conductive structure on the first film layer 13 from breaking off. Specifically, the buffer structure 31 can be configured as several protrusions or depressions arranged in a ring on the fixing surface, or as a gently rounded structure located at an edge of the fixing surface, or as several spaced-apart recesses arranged around the circumference of the fixing surface to reduce the contact area of ​​the fixing surface with the first film layer 13 or to reduce the impact force of the edge of the fixing surface on the first film layer 13.In the actual design process, the form of the fixing structure 3 can be designed according to process requirements, without any special specific definitions existing in this regard.

[0034] In a preferred embodiment, the circuit board structure 21 is a printed circuit board or a flexible circuit board.

[0035] Printed circuit boards, also known as PCBs, typically use glass fiber reinforced epoxy resin as a substrate and exhibit a certain degree of hardness and rigidity. Flexible printed circuit boards, also known as FPCs, are usually made of flexible materials such as polyimide (PI), polyester (PET), or similar materials and can be bent and folded. The specific selection process can be chosen based on the actual process requirements.

[0036] In a preferred embodiment, a predetermined resistance module 22 is arranged on the printed circuit board structure 21, as shown in Fig. 16 and Fig. 18 shown.

[0037] The printed circuit board structure 21 serves as an electrically conductive connecting component between the electrical connection unit 2 and the detection film unit 1. Therefore, the specified resistance can be pre-set on the printed circuit board structure 21 according to the configured connection type and the required parameters, such as resistance value. This standardizes the printed circuit board structure 21 in the early assembly phase, preventing frequent resistor mix-ups during assembly and simultaneously benefiting from automated production, thus accelerating the production cycle.

[0038] Specifically, the circuit design of the printed circuit board structure can have 21 different forms, e.g. a single circuit without a resistor, a single circuit with a resistor or a double circuit with a resistor, etc., and can be adapted depending on the previous design of the detection point circuit.

[0039] Examples of this are the following arrangements: the state with a single circuit without resistance, as in Fig. 14 shown, or the state with a single circuit with resistance (series and parallel resistances or only series resistance or only parallel resistance), as in Fig. 16 shown, or the state with a double-circle structure (one circle without resistance and one circle with resistance), as in Fig. 18 shown.

[0040] It is easy to see that the number of circuit connections 111 differs depending on the circuit configuration. In the case of a single circuit, two circuit connections should be formed at the electrical connection area 11, and in the case of a double circuit, four circuit connections are formed at the electrical connection area 11 accordingly (as can be seen from Fig. 13). Depending on the different embodiments, the number of first conductive parts 23 is also adjusted accordingly and is not limited to the number listed in this embodiment.

[0041] In a preferred embodiment, as in Fig. 4 shown, on the printed circuit board structure 21 at least two second conductive parts 25 are also arranged, wherein the second conductive parts 25 serve to be conductively connected to external electrical components via a cable harness 5 or a connection.

[0042] The second conductive part 25 can be in the form of a coating of conductive material or a connection fixed to the circuit board structure 21, without this being specifically defined. The external electrical components include a cable harness 5 / connector and a controller 6, the controller 6 serving to detect or receive and report back the electrical signals generated by the detection film unit 1, and the cable harness 5 or connector serving to be connected to the second conductive part 25.If the second conductive part 25 is present in the actual process in the form of a coating of conductive material, the assembly method for the printed circuit board structure 21 and the cable harness 5 consists of soldering and fixing the stripped ends of the cable harness to the second conductive part 25 using a tin-based connection, thus establishing a conductive circuit relationship between the detection film unit 1, the printed circuit board structure 21, and the controller 6. This allows for savings in conductive material and facilitates platform-based and automated production.

[0043] In particular, if the second conductive part 25 serves for conductive connection to external electrical components via terminals, the terminals can be formed integrally with the second conductive part 25 or connected to the second conductive part 25 later. The terminals can be inserted directly into a rubber box to form a connector for connection with a mating connector of the external electrical components.

[0044] Combined with Fig. 15, Fig. 17 and Fig. As can be seen from Figure 19 and the preceding description of the circuit design of the printed circuit board structure 21, the positive and negative terminals, as well as the individual pins PIN1, PIN2, PIN3, and PIN4 in the schematic circuit diagram, represent the connection nodes of the corresponding number of second conductive parts 25 with the cable harness 5 / connector for establishing the conductive connection with external electrical components. The switch marking in the schematic circuit diagram represents a conductive state of the detection film unit 1. When, in a circuit designed for a single conductive connection, the conductive material 12 on the first film 13 and the conductive material 12 on the second film 14 come into contact with each other under pressure in a provided through-hole and are conductively connected, the circuit switch is in a closed state.Accordingly, the circuit switch is in an open state when the conductive material 12 on the first foil 13 and the conductive material 12 on the second foil 14 do not come into contact with each other in this through-hole. In a circuit designed for a double conductive connection, the conductive material 12 on the first foil 13 and the conductive material 12 on the second foil 14 must come into contact with each other under pressure in at least two independent through-holes arranged on both sides of the spacer layer 14 and subsequently be conductively connected for the circuit switch to be in a closed state.Accordingly, the circuit switch is in the open state when the conductive material 12 on the first foil 13 and the conductive material 12 on the second foil 14 come into contact with each other only in a single through-hole or do not come into contact with each other in either of the two through-holes.

[0045] Regarding the arrangement of the specified resistor module in the circuit, reference should be made to the circuit diagrams in Fig. Reference is made to paragraphs 14 to 19. This shows that the presence of a resistance module has a direct influence on the characteristics of the electrical detection signal. For example, Fig. 17: If the detection film unit 1 is pressurized and conductive, the circuit switch is closed and the detection circuit detects only R1. If the detection film unit 1 is non-conductive, the circuit switch is open and the detection circuit detects R1 + R2. This allows the detection circuit to determine, based on the different detection results, whether a driver and a passenger are in the seats. Furthermore, if no predefined resistance module 22 is provided, the conductivity of the circuit can be used as a detection result (see Fig. 15). For example, Fig. 19: Since the Fig. 19 of the circuit design of Fig. 18 corresponds to two circuits, one of which is without resistance (see the line in the upper block in Fig. 19) and a resistance circuit (see the line in the lower block in Fig. 19), in which R4 and R3 are connected in series and parallel. In a practical application scenario, the two circuits can supply the detection functions of various modules of the entire vehicle. In this case, the conductivity of the circuit and the detected resistance value can be used as the detection result. Specifically, for the circuit without a resistor in the upper block in Fig. 19. The circuit is conductive when the switch is closed and non-conductive when the switch is open. For the resistor circuit in which R4 and R3 are connected in series and parallel, see the lower block in Fig. 19 is detected when the circuit switch R4 + R3 is closed and when the circuit switch R3 is open.

[0046] In a preferred embodiment, the first conductive part 23, the predetermined resistance module 22 and the second conductive part 25 can be distributed on the same side of the printed circuit board structure 21, or one of them can be distributed on one side and the other two can be distributed on the other side of the printed circuit board structure 21.

[0047] The first conductive part 23, the specified resistance module 22, and the second conductive part 25 can be conveniently arranged according to the current specifications of the printed circuit board structure 21. If the area of ​​the printed circuit board structure 21 is relatively small, to avoid short circuits, one of the first conductive part 23, the specified resistance module 22, and the second conductive part 25 can be arranged on a different side of the printed circuit board structure 21 than the other two (see Figure 2). Fig. 4) If the area of ​​the printed circuit board structure 21 is large enough, the first conductive part 23, the specified resistance module 22 and the second conductive part 25 can be arranged on the same side.

[0048] In particular, the specified resistor module 22 comprises a resistor and a circuit that connects the resistor to the first conductive part 23 and the second conductive part 25, wherein the resistor and the circuit are integrated, modularized, and standardized within the printed circuit board structure 21. Using this printed circuit board structure 21 for connection to the detection film unit 1 reduces the original cumbersome work steps, the risk of incorrect connections, and the use of conductive material.

[0049] In a preferred embodiment, an edge of the spacer layer 14 extends on one side near the electrical connection area 11 along the longitudinal direction of the detection film unit 1, forming an extension section 141 that projects beyond the length of the second film layer 15, as shown in Fig. 3, Fig. 5 and Fig. 6 shown; wherein an edge of the printed circuit board structure 21 is arranged on one side near the first film layer 13 in conjunction with the extension section 141 to reduce damage to the printed circuit board structure 21 and the detection film unit 1.

[0050] Since the individual layers of films in the detection film unit consist of flexible material, an edge of the printed circuit board structure 21 is located on one side near the first film layer 13 after pressing and fixing the first film layer 13 and the printed circuit board structure 21 via the fixing structure 3, directly below the extension section 141 of the spacer layer 14. In this way, the spacer layer 14 acts as a buffer layer, thereby effectively reducing the damage to the conductive material 12 on the first film layer 13 caused by collision with the printed circuit board structure 21.

[0051] In a preferred embodiment, this occupant pressure sensor comprises, as shown in Fig.20 shown, also a protective housing 4; wherein the printed circuit board structure 21, a connection point between the printed circuit board structure 21 and the detection film unit 1 and a connection point between the printed circuit board structure 21 and the cable harness 5 are all arranged inside the protective housing 4, wherein the protective housing 4 serves to protect the connection stability between the printed circuit board structure 21 and the detection film unit 1.

[0052] After the printed circuit board structure 21 and the detection film unit 1 have been fixed to the fixing structure 3 by pressing, the stability and safety of the occupant pressure sensor require a stable connection between the printed circuit board structure 21, the connection between the printed circuit board structure 21 and the detection film unit 1, and the connection between the printed circuit board structure 21 and the cable harness 5. Therefore, all these components should be located within the protective housing 4. The protective housing 4 can be a housing connector structure or an injection-molded, enclosing rubber block, without any specific definition.

[0053] The above description presents only preferred embodiments of the present application and illustrates the technical principles applied. The person skilled in the art should understand that the scope of the invention of the present application is not limited to the technical solutions formed by a particular combination of the above-mentioned technical features, but is intended to include other technical solutions formed by any combination of the above-mentioned technical features or their equivalents, without departing from the inventive concept. An example of this is a technical solution formed by replacing the above-mentioned features with technical features having similar functions that are disclosed (but not limited to) in the present application.

Claims

[1] Novel occupant pressure sensor, characterized by , that the novel occupant pressure sensor includes: a detection film unit (1), wherein the detection film unit (1) comprises a first film layer (13), a spacer layer (14) and a second film layer (15) arranged sequentially; wherein a conductive material (12) is arranged on one side of the first film (13) and the second film (14) near the spacer layer (14), wherein one end of the first film layer (13) extends outwards along a longitudinal direction of the detection film unit (1) and an electrical connection area (11) is formed at its terminal end, which is exposed outside the spacer layer (14) and the second film layer (15), wherein the electrical connection area (11) has at least two circuit terminals (111); an electrical connection unit (2), wherein the electrical connection unit (2) comprises a printed circuit board structure (21) at one end of the electrical connection unit (2); wherein at least two first conductive parts (23) are arranged on the printed circuit board structure (21); wherein the printed circuit board structure (21) is fixed to the electrical connection area (11) via at least one fixing structure (3), such that the first conductive parts (23) are each in contact with the circuit terminals (111), thereby establishing a conductive connection between the detection film unit (1) and the electrical connection unit (2) and forming a detection circuit. [2] Novel occupant pressure sensor according to claim 1, characterized by, that at least one first connection hole (17) is provided on the electrical connection area (11); and at least one second connection hole (24) is provided on the printed circuit board structure (21), wherein the second connection hole (24) is arranged correspondingly to the first connection hole (17); and the second connection hole (24) and the first connection hole (17) serve, in conjunction with the fixing structure (3), to fix the detection film unit (1) and the electrical connection unit (2). [3] Novel occupant pressure sensor according to claim 2, characterized by , that the fixing structure (3) is a rivet or a bolt and nut or a screw or a bayonet fitting or a connector or a clamp. [4] Novel occupant pressure sensor according to claim 3, characterized by, that the fixing structure (3) has a fixing surface which is in contact with an upper surface of the first film layer (13), wherein a buffer structure (31) is arranged on the fixing surface. [5] Novel occupant pressure sensor according to claim 3, characterized by , that the printed circuit board structure (21) is a printed circuit board or a flexible printed circuit board. [6] Novel occupant pressure sensor according to claim 1 or 5, characterized by , that a predetermined resistance module (22) is arranged on the printed circuit board structure (21). [7] Novel occupant pressure sensor according to claim 5, characterized by , that at least two second conductive parts (25) are arranged on the printed circuit board structure (21), wherein the second conductive parts (25) serve to be conductively connected to external electrical components via a cable harness (5) or a connection. [8] Novel occupant pressure sensor according to claim 6, characterized by , that the first conductive part (23), the specified resistance module (22) and the second conductive part (25) can be distributed on the same side of the printed circuit board structure (21) or one of them can be distributed on one side and the other two on the other side of the printed circuit board structure (21). [9] Novel occupant pressure sensor according to claim 1, characterized by , that an edge of the spacer layer (14) extends on one side near the electrical connection area (11) along the longitudinal direction of the detection film unit (1) forming an extension section (141) that projects beyond the length of the second film layer (15); wherein an edge of the printed circuit board structure (21) is arranged on one side near the first film layer (13) in conjunction with the extension section (141) to reduce damage to the printed circuit board structure (21) and the detection film unit (1). [10] Novel occupant pressure sensor according to claim 6, characterized by , that the novel occupant pressure sensor also comprises a protective housing (4); wherein the printed circuit board structure (21), a connection point between the printed circuit board structure (21) and the detection film unit (1) and a connection point between the printed circuit board structure (21) and the cable harness (5) are all arranged within the protective housing (4), wherein the protective housing (4) serves to protect a connection stability between the printed circuit board structure (21) and the detection film unit (1).

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