KR100885660B1 - Producing methods of passenger detector - Google Patents

Abstract

A producing methods of a passenger detector is provided to adjust precisely expansion degree of an airbag for a long term by reducing deviation of resistance value and increasing endurance of a pressure reduction resistance part. A producing methods of a passenger detector comprises a step of forming a PPD lower pattern consisting of a plurality of sensors and a connection part on one side of a lower film, and an SBR lower pattern consisting of a plurality of sensing parts and a linking part on a lower film(S17); a step of forming PPD upper pattern including a pressure reduction resistor part and an SBR upper pattern including a corresponding sensing part and a corresponding linking part on upper film(S25,S27); a step of boring a connection hole on double sided tape in order to conform a plurality of sensors and sensing part to the connection hole; and a step of adhering the lower film and the upper film through a double sided tape for the sensors, the pressure reduction resistor part, the sensing part, and the twin sensing part to face each other.

Description

Manufacturing Method of Passenger Presence Sensor Integrated with SBI and PD Sensors {PRODUCING METHODS OF PASSENGER DETECTOR}

The present invention relates to a method for manufacturing a passenger presence sensor for detecting seating of passengers, and more particularly, the SBR sensor related to the seat belt wearing and the PPD sensor related to the airbag driving are integrated to reduce the cost and the manufacturing process. In particular, the PPD sensor relates to a method for manufacturing a passenger presence sensor that reduces the deviation of the resistance value of the pressure-sensitive resistor for the accuracy of passenger characteristics while increasing the durability.

In general, the vehicle is equipped with a device that detects whether the passenger is wearing a seat belt to sound an alarm when not wearing, and the device to inflate the airbag in the seat of the passenger in the event of a crash.

The device that detects the seat belt is detected by the seat belt resistor (SBR) sensor built into the seat, and the alarm is not filled when the seat belt is detected by the SBR sensor. It's supposed to ring

The airbag inflator is equipped with a Passenger Presence Detector (PPD) sensor built into the seat seat to determine whether the passenger is on board, the weight and size of the passenger, so that the airbag is not inflated in a seat without passengers. The degree of inflation of the airbag is adjusted accordingly.

As such, the SBR sensor related to detecting whether the seat belt is worn and the PPD sensor related to the inflation of the air bag are devices for the safety of passengers.

As a result, the time and labor costs of installing the SBR and PPD sensors on the seats have not only increased, but the production cost of the two sensors has to be increased, resulting in increased material costs and complicated manufacturing processes.

The PPD sensor not only detects the passenger's boarding, but also estimates the passenger's body size from the passenger's weight, the passenger's seating position, the passenger's position, etc., thereby protecting the passenger from collision by adjusting the degree of inflation of the airbag. In addition, secondary damage from airbag inflation should be avoided.

In other words, the PPD sensor should be able to precisely control the degree of inflation of the airbag due to its high durability and reliability.

By the way, the conventional PPD sensor is made by simply printing a circuit pattern having a plurality of sensing units on the film, the durability and reliability is poor.

More specifically, the seat of the vehicle is provided with a heating wire, the film of the PPD sensor repeats the expansion and contraction occurs that the circuit pattern is separated from the film everywhere, the circuit pattern detection unit is likely to malfunction.

In addition, the detection unit of the PPD sensor circuit pattern is configured to extract the characteristics of the passengers (weight, size, sitting position, etc.) by changing the resistance value due to the pressure applied by the weight as the passenger sits. Many of the sensing units have a large resistance value, which makes it difficult to accurately extract passenger characteristics.

The present invention has been made to solve the above problems, the PPD sensor and the SBR sensor is integrated to provide a manufacturing method of the passenger presence sensor that can be carried out to reduce the manufacturing cost, reduce the manufacturing process and can be quickly mounted on the seat. For the purpose.

In addition, it is another object of the present invention to provide a method for manufacturing a passenger presence sensor that can more precisely control the airbag inflation degree by increasing the durability and reliability of the PPD sensor.

In order to achieve the above object, the SBR sensor and PPD sensor integrated passenger presence sensor manufacturing method of the present invention

A PPD bottom pattern formed of a plurality of sensing units, a plurality of sensing units interconnecting each other, and an end of the sensing unit connected to a connection port;

A lower film preparation step of forming an SBR lower pattern including a plurality of sensing units and a link unit interconnecting the plurality of sensing units on one surface of the lower film;

An upper PPD pattern including a corresponding sensing unit contacting each of the plurality of sensing units by pressing force;

The SBR upper pattern is formed on one surface of the upper film including contact links connected to each of the plurality of sensing parts by pressing force, the resistance value being changed according to the pressing pressure, and a corresponding link part connected at the end thereof to another connection port. Preparing an upper film;

A double-sided tape preparation step of drilling the connection hole on the double-sided tape such that the connection hole is disposed at a position corresponding to each of the plurality of sensing and sensing units;

And a film laminating step of adhering the lower film and the upper film with the double-sided tape to face the plurality of sensing units, the pressure-sensitive resistor unit, and the plurality of sensing units and the corresponding sensing units.

And the lower film preparation step

A preheat drying step of preheating the lower film to prevent subsequent shrinkage;

Aluminum printing step of printing by pressing the aluminum on the entire surface of the pre-heated lower film, and

A lower pattern forming step of forming a PPD lower pattern and an SBR lower pattern of aluminum on one surface of the lower film by laminating, exposing and etching the dry film;

And a carbon printing step of printing carbon on the PPD lower pattern and the SBR lower pattern of the aluminum.

The upper film preparation step

A preheat drying step of preheating and drying the upper film to prevent subsequent shrinkage;

Forming a SBR upper pattern by printing silver on a predetermined portion of a preheated upper film and printing carbon on the silver surface to form the SBR upper pattern;

And a PPD upper pattern forming step of forming the PPD upper pattern by printing a carbon solution mixed with a concentrated adhesive on a predetermined portion of one surface of the preheated and dried upper film.

Preheating of the preheat drying step of the upper film and the lower film is carried out at 120 degrees for 16 minutes,

Aluminum printing and carbon printing of the lower film is carried out at 110 degrees for 16 minutes,

Silver printing and carbon printing of the upper perm is characterized in that it is carried out at 110 degrees for 16 minutes.

The present invention having the configuration as described above, PPD sensor and SBR sensor is integrated, material cost is reduced, manufacturing process is reduced, the price is excellent,

Preheat and dry the upper film and the lower film to prevent shrinkage in the future, and the pressure-sensitive resistor part of the PPD sensor is printed by implementing carbon liquid mixed with concentrated adhesive (varnish-PC25) to increase the durability of the pressure-sensitive resistor part and reduce the deviation of resistance value. An object of the present invention is to provide a method for manufacturing a passenger presence sensor which can precisely adjust the degree of expansion of an airbag for a long time.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

Figure 1 is a flow chart of the manufacturing process of the passenger presence sensor according to the present invention, Figure 2 is a plan view of the lower film formed PPD lower pattern and SBR lower pattern through the lower film preparation step, Figure 3 is a top film preparation step 5 is a plan view of the upper film having the PPD upper pattern and the SBR upper pattern formed thereon, FIG. 5 is a plan view of the double-sided tape which has undergone the double-sided tape preparation step, and FIG. 5 is a plan view of the passenger presence sensor completed through the film lamination step.

As shown in Figure 1, the passenger presence sensor manufacturing method of the present invention, the lower film preparation step (S11-S19), the upper film preparation step (S21-S27), the double-sided tape preparation step (S31-S33), and film lamination Steps S41-S47 are made.

Here, the lower film preparation step, the upper film preparation step, the double-sided tape preparation step is not a priority between each other, any step may proceed first. Therefore, the description in the above order does not limit the scope of the manufacturing method of the present invention by only the above order.

The lower film preparation step includes a receipt and inspection step (S11), a preheating drying step (S13), an aluminum printing step (S15), a lower pattern forming step (S17), and a carbon printing step (S19).

In the receiving and inspection step (S11), after wearing the lower film 10, the specifications, materials, etc. are inspected and foreign substances on the surface of the lower film 10 are reconsidered. In the present invention, the lower film 10 used a pen film of 188um.

In the preheating drying step (S13), the lower film 10, which has undergone the wearing and inspection step, is heated and dried at about 120 degrees for 16 minutes to minimize shrinkage of the lower film 10 afterwards.

This prevents the lower film 10 from being expanded / contracted by the heating wire of the seat, thereby preventing the durability and reliability of the passenger presence sensor from being lowered, and preventing the contraction in the next process, thereby forming the surface of the lower film 10. It is a process for reducing the up, down, left and right deviation of the circuit pattern.

After the preheating drying step S13, aluminum is printed on the entire surface of the lower film 10 by thermocompression. (S15) Thermocompression is performed at 110 degrees for 16 minutes. Aluminum is firmly adhered to the surface of the lower film 10 by thermocompression printing aluminum. The thickness of aluminum is about 9um.

After printing aluminum, although not shown in the drawing, a fixing piercing hole drilling operation is performed on the lower film 10 for the next step.

Next, in the lower pattern forming step (S17), a PPD lower pattern and an SBR lower pattern are formed.

The lower pattern forming step includes washing the aluminum surface, laminating a dry film on the aluminum surface and coating the coating, exposing the dry film surface to form a circuit pattern, and leaving only the circuit pan developed by etching. Dry film).

On the lower film 10 through the lower pattern forming step, a PPD lower pattern comprising a plurality of (about 50 to 60) sensing parts 11 and connecting parts 13 interconnecting the sensing parts 11; An SBR lower pattern including a plurality of sensing units 15 (about 8) and a link unit 17 connecting the sensing units 15 is formed.

The end of the connecting portion 13 is connected to the connection port to transmit a detection signal to the airbag unit.

Next, low-resistance carbon is printed and dried on the aluminum surface forming the PPD lower pattern and the SBR lower pattern. (S19) Carbon printing is performed at 110 degrees for 16 minutes.

The upper film preparation step includes a receiving and inspecting step (S21), a preheating drying step (S23), and an upper pattern forming step (S25, S27).

In the receiving and inspection step, after receiving the upper film 20, the specifications, materials, etc. are inspected and foreign substances on the surface of the upper film 20 are reconsidered. In the present invention, the lower film 10 used a pen film of 125um.

In the preheating drying step (S23), the upper film 20 that has undergone the wearing and inspection step is heated and dried at about 120 degrees for 16 minutes to minimize shrinkage of the upper film 20 afterwards.

This is a process for preventing the durability and reliability of the passenger presence sensor by preventing the upper film 20 from expanding / contracted by the heating wire of the seat.

Next, the upper pattern forming step includes a PPD upper pattern forming step S27 and an SBR upper pattern forming step S25, and there is no priority between them.

SBR upper pattern forming step (S25) is made of a process of printing silver on one surface of the upper film 20, and printing carbon on the printed silver surface. Printing is performed at 110 degrees for 16 minutes.

PPD upper pattern forming step (S27) is made of a process of concentrating the varnish (PC-25) as an adhesive, and mixing the concentrated varnish with the carbon liquid, and then printing the mixed carbon liquid on one surface of the upper film (20). Printing is performed at 110 degrees for 16 minutes.

By mixing the concentrated adhesive with the carbon liquid, the carbon is more tightly printed on the upper film 20 so that it is not easily separated from the upper film 20, and the concentrated adhesive condenses the carbon liquid (by increasing the density of the carbon) so that the resistance value is increased. The deviation of is reduced.

A pressure sensing resistor 21 (FSR; Force Sensing Resistor) is formed at a position corresponding to each of the plurality of sensing units 11 on one surface of the upper film 20 through the upper pattern forming step, and the plurality of sensing units ( 15) a corresponding sensing unit 25 is formed at a position corresponding to each, and the corresponding sensing units 25 are connected to each other through a corresponding link unit 27. And the end of the corresponding link unit 27 is connected to another connection port and transmits a detection signal to the seat belt wearing detection unit.

For reference, the pressure-sensitive resistor 21 is a kind of thick film sensor having a characteristic that the resistance decreases when the vertical pressing force is increased. When the pressing force of 1-10,000 [gr] is changed, the resistance value is 500-1 [ k ohm].

The double-sided tape preparation step includes a receiving and inspection step (S31) and a connection hole 31, drilling step (S33).

In the receiving and inspection step (S31), the size and material of the received double-sided tape 30 is examined. As the double-sided tape 30, a double-sided tape 30 for hot mat adhesion is used.

After the receipt and inspection, the connection part 31 is drilled at a position corresponding to the sensing part 11 and the sensing part 15 of the lower pattern by a Thomson operation to detect the sensing part 11 and the pressure-sensitive resistance part 21, In addition, the sensing unit 15 and the corresponding sensing unit 25 face each other, and the connection unit 13 of the PPD lower pattern and the link unit 17 of the SBR upper pattern are not shorted. The sensing unit 11 and the pressure-sensitive resistor 21, the sensing unit 15, and the corresponding sensing unit 25 face each other so as to be in contact with each other, and the connection unit 13 and the link are connected to each other through a double-sided tape 30. The part 17 is separated so as not to be shorted.

After all of the lower film 10, the upper film 20, the double-sided tape 30 is prepared through such a process

After the double-sided tape 30 releases the double-sided protective film, the lower film 10, the double-sided tape 30, the upper film 20 are adhesively assembled in the order of lamination, and laminated to the lower film 10 and the upper film 20. (S41, S43)

After forming the product by pressing the outer film of the laminated film by Thomson's work, the resistance value of the pressure-sensitive resistor 21 of the PPD upper pattern and the corresponding sensing unit 25 of the SBR upper pattern is inspected to complete the work. S45, S47)

In the above description of the present invention, a method for manufacturing a passenger presence sensor in which a PPD sensor and an SBR sensor are integrated with a specific process has been described with reference to the accompanying drawings, but the present invention can be variously modified and changed by those skilled in the art. Such modifications and variations are to be interpreted as falling within the protection scope of the present invention.

1 is a manufacturing process flowchart of the passenger presence sensor according to the present invention.

Figure 2 is a plan view of the lower film after the lower film preparation step.

3 is a plan view of the upper film undergoing the upper film preparation step.

Figure 4 is a plan view of the double-sided tape passed through the double-sided tape preparation step.

5 is a plan view of the passenger presence sensor completed through the film lamination step.

<Description of the symbols for the main parts of the drawings>

10: lower film 11: the detection unit

13 connection part 15 sensing part

17: link portion 20: upper film

21: decompression resistance unit 25: corresponding sensing unit

27: link portion 30: double-sided tape

31: connecting hole

Claims (4)

A PPD bottom pattern formed of a plurality of sensing units, a plurality of sensing units interconnecting each other, and an end of the sensing unit connected to a connection port; A lower film preparation step of forming an SBR lower pattern including a plurality of sensing units and a link unit interconnecting the plurality of sensing units on one surface of the lower film; An upper portion of the PPD including a pressure-sensitive resistor that is in contact with each of the plurality of sensing units by a pressing force, and the resistance value changes according to the pressing force; Forming an SBR upper pattern on one surface of the upper film including a corresponding sensing part contacting each of the plurality of sensing parts by pressing force, and a corresponding link part interconnecting the plurality of corresponding sensing parts and having an end portion connected to another connection port. Upper film preparation step; A double-sided tape preparation step of drilling the connection hole on the double-sided tape such that the connection hole is disposed at a position corresponding to each of the plurality of sensing and sensing units; Integrating the SBR sensor and the PPD sensor comprising a plurality of sensing unit and the pressure-sensitive resistor unit, the film laminating step of bonding the lower film and the upper film with the double-sided tape so that the plurality of sensing unit and the corresponding sensing unit facing each other. Passenger presence sensor manufacturing method. The method of claim 1, wherein the lower film preparation step A preheat drying step of preheating the lower film to prevent subsequent shrinkage; Aluminum printing step of printing by pressing the aluminum on the entire surface of the pre-heated lower film, and A lower pattern forming step of forming a PPD lower pattern and an SBR lower pattern of aluminum on one surface of the lower film by laminating, exposing and etching the dry film; And a carbon printing step of printing carbon on the PPD lower pattern and the SBR lower pattern of the aluminum, wherein the SBR sensor and the PPD sensor are integrated. According to claim 1 or 2, wherein the upper film preparation step A preheat drying step of preheating and drying the upper film to prevent subsequent shrinkage; Forming a SBR upper pattern by printing silver on a predetermined portion of a preheated upper film and printing carbon on the silver surface to form the SBR upper pattern; Passenger presence detection integrated with the SBR sensor and PPD sensor characterized in that it comprises a PPD upper pattern forming step of forming the PPD upper pattern by printing a carbon solution mixed with a concentrated adhesive on a predetermined portion of the pre-heated upper film Sensor manufacturing method. The method of claim 3, wherein Preheating of the preheat drying step of the upper film and the lower film is carried out at 120 degrees for 16 minutes, Aluminum printing and carbon printing of the lower film is carried out at 110 degrees for 16 minutes, Silver printing and carbon printing of the upper pitch is carried out at 110 degrees for 16 minutes SBR sensor and PPD sensor integrated passenger presence sensor manufacturing method characterized in that.

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