JP6840039B2 - Seat belt device - Google Patents

Description

The present invention relates to a seatbelt device.

Conventionally, a buckle including a power generation unit that generates power by inserting a tongue attached to a seatbelt and a transmission unit that wirelessly transmits a signal indicating that the tongue has been inserted using the power generated by the power generation unit. Is known (see, for example, Patent Documents 1 to 3).

Japanese Unexamined Patent Publication No. 2008-238947 Japanese Unexamined Patent Publication No. 2008-308014 JP 2015-000592

The conventional transmitter provided on the buckle uses the power generated by the power generator provided on the buckle to wirelessly transmit a signal indicating that the tongue has been inserted into the buckle. However, since the length of time from when the tongue begins to be inserted into the buckle until the insertion is completed is very short, the amount of power generated by the power generation unit provided in the buckle by the tongue insertion operation does not increase so much. In some cases. In such a case, the amount of power that the transmitter can use for wireless transmission is reduced.

Therefore, the present disclosure provides a seatbelt device capable of increasing the amount of electric power that can be used by a transmission unit that wirelessly transmits information about a state detected on the buckle side.

In one aspect of the disclosure,
With seat belts
The tongue attached to the seat belt and
The buckle from which the tongue is inserted and removed,
The retractor that winds up the seat belt and
A power generation unit provided on the retractor and generating electricity by pulling out the seat belt from the retractor or winding it around the retractor.
A detection unit provided on the buckle to detect a predetermined state,
Provided is a seatbelt device including a transmission unit that wirelessly transmits information about a state detected by the detection unit using the electric power generated by the power generation unit.

According to the seatbelt device according to one aspect of the present disclosure, the transmission unit uses the electric power generated by the power generation unit provided in the retractor to provide information on a state detected by the detection unit provided in the buckle. Wirelessly transmit. The length of time that the seatbelt is pulled out of or wound up by the retractor is relatively long, for example, longer than the time from when the tongue begins to be inserted into the buckle until its insertion is complete. Therefore, the amount of power generated by the power generation unit provided in the retractor by the seatbelt pulling-out operation or winding operation increases. For example, the amount of power generation is larger than that in the form in which the power generation unit provided on the buckle generates power by the insertion operation of the tongue. As a result, the amount of power that the transmitter can use for wireless transmission can be increased.

Therefore, according to one aspect of the present disclosure, it is possible to increase the amount of power that can be used by the transmission unit that wirelessly transmits information about the state detected on the buckle side.

It is a figure which shows an example of the structure of a seat belt device. It is a figure which shows an example of the structure of the seatbelt reminder system which concerns on 1st Embodiment. It is a figure which shows an example of the circuit structure of the retractor and the buckle which concerns on 1st Embodiment. It is a figure which shows an example of the structure of the seatbelt reminder system which concerns on 2nd Embodiment. It is a figure which shows an example of the structure of the retractor and the buckle which concerns on 2nd Embodiment.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings.

FIG. 1 is a diagram showing an example of the configuration of a seatbelt device. The seatbelt device 101 shown in FIG. 1 is an example of a seatbelt device mounted on a vehicle. The seatbelt device 101 includes, for example, a seatbelt 104, a retractor 103, a shoulder anchor 106, a tongue 107, and a buckle 108.

The seat belt 104 is an example of a seat belt that restrains an occupant 111 sitting on the seat 102 of the vehicle, and is a band-shaped member that is retractably wound around the retractor 103. Seat belts are also called webbing. The belt anchor 105 at the tip of the seat belt 104 is fixed to the seat 102 or the vehicle body in the vicinity of the seat 102.

The retractor 103 is an example of a seatbelt winder that enables the seatbelt 104 to be wound up or pulled out. The retractor 103 restricts the seatbelt 104 from being pulled out from the retractor 103 when an acceleration / deceleration or a vehicle angle equal to or higher than a predetermined value is detected, such as when a vehicle collides. The retractor 103 is fixed to the seat 102 or the vehicle body in the vicinity of the seat 102. The retractor 103 is an example of a seatbelt retractor.

The retractor 103 may have a function of winding the seat belt 104 on the spool by the power of the motor. For example, before a vehicle collision, the retractor 103 operates a motor based on a signal from a sensor such as a millimeter-wave radar to wind the seatbelt 104 on a spool, pretension the seatbelt 104, and use the seatbelt 104. Quickly restrain occupants. Further, the retractor 103 operates a motor when the engagement between the tongue 107 and the buckle 108 is released, and winds the seatbelt 104 with a spool, for example. Further, the retractor 103, for example, operates a motor to adjust the tension of the seatbelt 104 according to a driving situation (vehicle condition), so that the occupant is restrained by the seatbelt 104 and when the seatbelt 104 is fastened. Improve each comfort.

The state of the vehicle is, for example, the presence / absence of the seatbelt 104 pulled out, the presence / absence of the occupant 111, the traveling speed of the vehicle, the acceleration of the vehicle, the steering operation, the accelerator operation, the brake operation, the operation of the buckle 108, the door operation, and the operation by the occupant. It refers to a state that represents the operation input of a possible in-vehicle selection switch.

The shoulder anchor 106 is an example of a belt insertion tool through which the seat belt 104 is inserted, and is a member that guides the seat belt 104 pulled out from the retractor 103 toward the shoulder portion of the occupant 111. The shoulder anchor 106 is fixed to the seat 102 or the vehicle body in the vicinity of the seat 102.

The tongue 107 is an example of a belt insertion tool through which the seat belt 104 is inserted, and is a component slidably attached to the seat belt 104 guided by the shoulder anchor 106.

The buckle 108 is a component into which a flat locking portion of the tongue 107 attached to the seat belt 104 is inserted and removed, and the tongue 107 is detachably connected. The buckle 108 is fixed to, for example, the floor of the vehicle body or the seat 102.

With the tongue 107 connected to the buckle 108, the portion of the seatbelt 104 between the shoulder anchor 106 and the tongue 107 is the shoulder belt portion 109 that restrains the chest and shoulders of the occupant 111. With the tongue 107 connected to the buckle 108, the portion of the seat belt 104 between the belt anchor 105 and the tongue 107 is the lap belt portion 110 that restrains the waist portion of the occupant 111.

<First Embodiment>
FIG. 2 is a diagram showing an example of the configuration of the seatbelt reminder system according to the first embodiment. The seatbelt reminder system 100 shown in FIG. 2 is one of the in-vehicle systems mounted on the vehicle. The seatbelt reminder system 100 includes a retractor 130, a buckle 180, a receiver 112, a control device 113, and a notification device 114.

The retractor 130 is an example of the retractor 103 (see FIG. 1). The retractor 130 includes a base plate 133, a spool 132, and a power generation unit 11.

The spool 132 is rotatably supported by the base plate 133. The spool 132 is a rotating member that winds up the seat belt 104 that restrains the occupant 111.

The power generation unit 11 is an example of a power generation unit provided in the retractor 130. The power generation unit 11 generates electricity when the seat belt 104 is pulled out from the spool 132 of the retractor 130 or wound up on the spool 132 of the retractor 130. The power generation unit 11 converts, for example, the rotational motion of the rotation shaft of the spool 132 into electric power.

The power generation unit 11 is, for example, the above-mentioned motor that rotates the spool (that is, the above-mentioned motor is also used as a generator). Alternatively, the power generation unit 11 may be a generator provided in the retractor 103 separately from the above-mentioned motor. Alternatively, the power generation unit 11 may be provided in the retractor 130 in which the above-mentioned motor is not provided.

The buckle 180 is an example of the buckle 108 (see FIG. 1). The buckle 180 includes an operation button 181. The operation button 181 is an example of an operation member that receives a push operation for releasing the connection between the tongue 107 and the buckle 180 from the occupant's fingers.

The retractor 130 and the buckle 180 are connected to each other via at least one wire (two wires 51 and 52 in the illustrated embodiment). For example, the wiring 51 is a power harness, and the wiring 52 is a ground harness. The electric power generated by the power generation unit 11 is input to the buckle 180 via the wiring 51. In the form without the wiring 52, the grounds of the retractor 130 and the buckle 180 are connected to, for example, a ground portion of a vehicle body or the like.

The receiver 112 is an in-vehicle device that wirelessly receives information (insertion / extraction information) about the insertion / removal state of the tongue 107 and the buckle 180. The receiver 112 receives the insertion / removal information wirelessly transmitted from the buckle 180 and transmits it to the control device 113 mounted on the vehicle.

The control device 113 uses at least the insertion / removal information received from the receiver 112 to remind the occupant 111 to wear the seatbelt 104 when it is determined that the occupant 111 is not wearing the seatbelt 104. Is output to the notification device 114. The control device 113 is, for example, an electronic control device (so-called ECU (Electronic Control Unit)) including a CPU (Central Processing Unit) for executing the processing and a microcomputer having a built-in memory. The CPU is an example of a processor. The receiver 112 and the control device 113 may be integrated.

The notification device 114 is an in-vehicle device that receives a reminder signal output from the control device 113. Based on the received remind signal, the notification device 114 notifies the occupant of information prompting the occupant to wear the seatbelt 104 by at least one of visual and audible warning methods. Specific examples of the notification device 114 include a display and a speaker.

In this way, by transmitting and receiving the insertion / removal information between the buckle 180 and the receiver 112 by wireless communication, it is possible to reduce the number of wire harnesses for transmitting the insertion / removal information by wired communication. If the number of wire harnesses can be reduced, for example, the degree of freedom in seat layout is improved, and the weight of the vehicle can be reduced.

FIG. 3 is a diagram showing an example of the circuit configuration of the retractor and the buckle according to the first embodiment. The retractor 130 and the buckle 180 are connected to each other by two wires 51 and 52.

The retractor 130 includes an internal power supply line 21, an internal ground line 22, a power generation unit 11, a rectifying unit 14, a Zener diode 19 and a capacitor 20.

The internal power supply line 21 is a current path connected between the first electrode of the power generation unit 11 and the wiring 51, and the internal ground line 22 is between the second electrode of the power generation unit 11 and the wiring 52. It is a connected current path.

The rectifying unit 14 converts the AC powers 12 and 13 output from the power generation unit 11 into DC power 23, and outputs the DC power 23 to the internal power supply line 21. The rectifying unit 14 has four diodes 15 to 18. The diode 15 has an anode connected to the first electrode side of the power generation unit 11 and is inserted in series with the internal power supply line 21. The diode 16 has a cathode connected to the second electrode side of the power generation unit 11 and is inserted in series with the internal ground line 22. The diode 17 has an anode connected to the anode of the diode 16 and a cathode connected to the anode of the diode 15. The diode 18 has an anode connected to the cathode of the diode 16 and a cathode connected to the cathode of the diode 15.

The Zener diode 19 is connected in parallel to the output side of the rectifying unit 14, and has an anode connected to the internal ground line 22 and a cathode connected to the internal power supply line 21. The voltage of the DC power 23 (DC voltage) is clamped by the Zener voltage of the Zener diode 19.

The capacitor 20 is connected in parallel to the output side of the rectifying unit 14 and the Zener diode 19, and has one end connected to the internal power supply line 21 and the other end connected to the internal ground line 22. The voltage of the DC power 23 is smoothed by the capacitor 20.

The buckle 180 has an internal power supply line 31, 42, an internal ground line 32, capacitors 33, 35, a regulator 34, a buckle switch 36, a resistor 37, and a transmission unit 41.

The internal power supply lines 31 and 42 are paths for supplying the DC power 23 (that is, the power generated by the power generation unit 11) input to the buckle 180 from the retractor 130 via the wiring 51 to the transmission unit 41. The internal power supply lines 31 and 42 are current paths connected between the wiring 51 and the transmission unit 41. The internal power supply line 31 is a current path connected between the input terminal IN of the regulator 34 and the wiring 51, and the internal power supply line 42 is between the output terminal OUT of the regulator 34 and the power supply terminal VCS of the transmission unit 41. It is a current path connected to. The internal ground line 32 is a current path connected between the wiring 52 and the ground terminal GND of the transmission unit 41.

The capacitor 33 is connected between the internal power supply line 31 and the internal ground line 32. The voltage of the DC power 23 (that is, the power generated by the power generation unit 11) input from the retractor 130 to the buckle 180 via the wiring 51 is smoothed by the capacitor 33.

The regulator 34 converts the DC power 23 input to the buckle 180 into a voltage to generate an internal power supply voltage whose voltage value is lower than the voltage of the DC power 23. The regulator 34 steps down the power input from the input terminal IN and outputs a DC internal power supply voltage from the output terminal OUT. The regulator 34 is, for example, an integrated circuit including an IN terminal connected to the internal power supply line 31, an OUT terminal connected to the internal power supply line 42, and a GND terminal connected to the internal ground line 32.

The capacitor 35 is connected between the internal power supply line 42 and the internal ground line 32. The internal power supply voltage generated by the regulator 34 is smoothed by the capacitor 35.

The buckle switch 36 is an example of a detection unit provided on the buckle to detect a predetermined state. The buckle switch 36 operates as the tongue 107 is inserted into the buckle 180 or the tongue 107 is pulled out of the buckle 180. The buckle switch 36 detects the insertion / removal state of the tongue 107 and the buckle 180, and outputs a buckle switch signal indicating the insertion / removal state. A resistor 37 is connected between the buckle switch 36 and the internal power supply line 42.

For example, when the tongue 107 is pulled out of the buckle 180, the buckle switch 36 turns off the path between the internal ground line 32 and the connection node 44. As a result, a signal indicating a state in which the tongue 107 is pulled out from the buckle 180 (in the illustrated embodiment, a buckle switch signal having a high voltage value) is transmitted from the connection node 44 between the resistor 37 and the buckle switch 36. It is input to 41. On the other hand, when the tongue 107 is inserted into the buckle 180, the buckle switch 36 turns on the path between the internal ground line 32 and the connection node 44. As a result, a signal indicating the state in which the tongue 107 is inserted into the buckle 180 (in the illustrated embodiment, a buckle switch signal having a low voltage value) is transmitted from the connection node 44 between the resistor 37 and the buckle switch 36. It is input to the unit 41.

The transmission unit 41 wirelessly transmits information about the state detected by the buckle switch 36 using the electric power generated by the power generation unit 11. The transmitter 41 has, for example, a control circuit 38, a transmitter 39, and an antenna 40.

The control circuit 38 has an insertion / removal determination function for determining the insertion / removal state of the tongue 107 and the buckle 180. The control circuit 38 is in a state in which the tongue 107 is inserted in the buckle 180 or a state in which the tongue 107 is removed from the buckle 180 based on a buckle switch signal indicating a detection result of the insertion / removal state of the tongue 107 and the buckle 180. Is determined. For example, when the control circuit 38 detects a buckle switch signal having a high voltage value, the control circuit 38 determines that the tongue 107 is in a state of being pulled out from the buckle 180. On the other hand, when the control circuit 38 detects, for example, a buckle switch signal having a low voltage value, the control circuit 38 determines that the tongue 107 is in a state of being inserted into the buckle 180. The control circuit 38 outputs an insertion / removal determination signal indicating the determination result of the insertion / removal state of the tongue 107 and the buckle 180 from the general-purpose terminal IO.

The control circuit 38 is, for example, a microcomputer having a built-in CPU and memory for executing such insertion / removal determination processing. For example, the control circuit 38 includes a power supply terminal VCS connected to the internal power supply line 42, an input terminal IN connected to the connection node 44, a ground terminal GND connected to the internal ground line 32, and an input terminal of the transmitter 39. It has a general-purpose terminal IO connected to IN.

In response to the insertion / removal determination signal from the control circuit 38, the transmitter 39 transmits insertion / removal information indicating whether the tongue 107 is inserted into the buckle 180 or the tongue 107 is removed from the buckle 180 via the antenna 40. Send wirelessly. The transmitter 39 is connected to, for example, a power supply terminal VCS connected to the internal power supply line 42, an input terminal IN connected to the control circuit 38, a ground terminal GND connected to the internal ground line 32, and an antenna 40. It is an integrated circuit provided with an output terminal OUT.

Therefore, the transmission unit 41 wirelessly transmits the insertion / removal information about the state detected by the buckle switch 36 provided on the buckle 180 by using the electric power generated by the power generation unit 11 provided on the retractor 130. The length of time that the seatbelt 104 is pulled out of or wound up on the retractor 130 is relatively long, for example, compared to the time from when the tongue 107 begins to be inserted into the buckle 180 until its insertion is complete. long. Therefore, the amount of power generated by the power generation unit 11 provided in the retractor 130 by the pull-out operation or the winding operation of the seatbelt 104 increases. For example, the amount of power generation is larger than that in the form in which the power generation unit provided on the buckle generates power by the insertion operation of the tongue. As a result, the amount of power that the transmission unit 41 can use for wireless transmission can be increased. Therefore, the amount of power that can be used by the transmission unit 41 that wirelessly transmits the insertion / extraction information about the state detected by the buckle switch 36 on the buckle 180 side can be increased.

<Second embodiment>
FIG. 4 is a diagram showing an example of the configuration of the seatbelt reminder system according to the second embodiment. The seatbelt reminder system 200 shown in FIG. 4 is one of the in-vehicle systems mounted on the vehicle. The seatbelt reminder system 200 includes a retractor 230, a buckle 280, a receiver 112, a control device 113, and a notification device 114. The description of the same configuration and effect as that of the first embodiment of the second embodiment will be omitted or simplified by referring to the above description.

In the first embodiment (see FIG. 2), the transmission unit provided in the buckle 180 wirelessly transmits information about the state detected on the buckle 180 side by using the electric power generated by the power generation unit 11. On the other hand, in the second embodiment (see FIG. 4), the transmission unit provided in the retractor 230 uses the electric power generated by the power generation unit 11 to provide information about the state detected on the buckle 280 side. Send wirelessly.

In FIG. 4, the retractor 230 is an example of the retractor 103 (see FIG. 1). The buckle 280 is an example of the buckle 108 (see FIG. 1).

The retractor 230 and the buckle 280 are connected to each other via at least one wire (two wires 53 and 54 in the illustrated embodiment). For example, the wiring 53 is a signal harness, and the wiring 54 is a ground harness. In the form without the wiring 52, the grounds of the retractor 130 and the buckle 180 are connected to, for example, a ground portion of a vehicle body or the like.

In the first embodiment described above (see FIG. 2), the electric power generated by the power generation unit 11 is input from the retractor 130 to the buckle 180 via the wiring 51. On the other hand, in the second embodiment (see FIG. 4), the signal representing the state detected on the buckle 280 side is input from the buckle 280 to the retractor 230 via the wiring 53.

In FIG. 4, the receiver 112 is an in-vehicle device that wirelessly receives information (insertion / extraction information) about the insertion / removal state of the tongue 107 and the buckle 280. The receiver 112 receives the insertion / removal information wirelessly transmitted from the retractor 230 and transmits it to the control device 113 mounted on the vehicle. The functions of the receiver 112, the control device 113, and the notification device 114 are the same as those in the above-described embodiment.

FIG. 5 is a diagram showing an example of the circuit configuration of the retractor and the buckle according to the second embodiment. The retractor 230 and the buckle 280 are connected to each other by two wires 53 and 54. Of the forms shown in FIG. 5, the description of the same configuration and effect as the form shown in FIG. 3 described above will be omitted or simplified by referring to the above description.

In FIG. 3, which shows the first embodiment, the internal power supply line 42, the regulator 34, the resistor 37, and the transmission unit 41 are provided on the buckle 180. On the other hand, in FIG. 5 according to the second embodiment, the internal power supply line 42, the regulator 34, the resistor 37, and the transmission unit 41 are provided in the retractor 230.

In FIG. 5, the internal power supply lines 21 and 42 are paths for supplying DC power 23 (power generated by the power generation unit 11) to the transmission unit 41. The internal power supply lines 21 and 42 are current paths connected between the power generation unit 11 and the transmission unit 41. The internal ground line 22 is a current path connected to the wiring 54. A resistor 37 is connected between the internal power supply line 42 and the wiring 53. The connection node 45 and the wiring 53 are connected by an internal signal line 43. A resistor 37 is connected between the buckle switch 36 and the internal power supply line 42.

For example, when the tongue 107 is pulled out of the buckle 280, the buckle switch 36 turns off the path between the wire 53 and the wire 54 (ie, between the internal ground line 22 and the connection node 45). To do. As a result, a signal indicating a state in which the tongue 107 is pulled out from the buckle 280 (in the illustrated embodiment, a buckle switch signal having a high voltage value) is transmitted from the connection node 45 between the resistor 37 and the wiring 53 to the transmission unit 41. Is entered in. On the other hand, when the tongue 107 is inserted into the buckle 280, the buckle switch 36 turns on the path between the wiring 53 and the wiring 54 (that is, between the internal ground line 22 and the connection node 45). To. As a result, a signal indicating the state in which the tongue 107 is inserted into the buckle 280 (in the illustrated embodiment, a buckle switch signal having a low voltage value) is transmitted from the connection node 45 between the resistor 37 and the wiring 53. It is input to 41.

The transmission unit 41 wirelessly transmits information about the state detected by the buckle switch 36 using the electric power generated by the power generation unit 11. The transmitter 41 has, for example, a control circuit 38, a transmitter 39, and an antenna 40. The functions of the control circuit 38, the transmitter 39, and the antenna 40 are the same as those in the above-described embodiment.

Therefore, the transmission unit 41 wirelessly transmits the insertion / removal information about the state detected by the buckle switch 36 provided on the buckle 280 by using the electric power generated by the power generation unit 11 provided on the retractor 230. The length of time that the seatbelt 104 is pulled out of or wound up on the retractor 230 is relatively long, for example, compared to the time from when the tongue 107 begins to be inserted into the buckle 280 until its insertion is complete. long. Therefore, the amount of power generated by the power generation unit 11 provided in the retractor 230 by the pull-out operation or the winding operation of the seatbelt 104 increases. For example, the amount of power generation is larger than that in the form in which the power generation unit provided on the buckle generates power by the insertion operation of the tongue. As a result, the amount of power that the transmission unit 41 can use for wireless transmission can be increased. Therefore, the amount of power that can be used by the transmission unit 41 that wirelessly transmits the insertion / extraction information about the state detected by the buckle switch 36 on the buckle 280 side can be increased.

Although the seatbelt device has been described above according to the embodiment, the present invention is not limited to the above embodiment. Various modifications and improvements, such as combinations and substitutions with some or all of the other embodiments, are possible within the scope of the present invention.

For example, the transmission unit 41 is provided on the buckle 180 in the first embodiment, and is provided on the retractor 230 in the second embodiment. However, a part or all of the transmission unit 41 may be provided at a place other than the buckle and the retractor (for example, the sheet 102 (see FIG. 1)). For example, the control circuit 38 is provided in the buckle or the retractor, and the transmitter 39 and the antenna 40 are provided in a place other than the buckle and the retractor.

Further, the retractor or the buckle may include a power storage unit that stores the electric power generated by the power generation unit 11. The power storage unit stores the electric power generated by the power generation unit 11, and supplies the stored electric power to a load different from the transmission unit 41 or the transmission unit 41. As a result, the electric power generated by the power generation unit 11 can be used by the load other than the transmission unit 41 or the transmission unit 41 even at a timing different from the timing at which the tongue insertion operation or extraction operation is performed. The load different from the transmission unit 41 may be a load such as a sensor or a lamp provided on the buckle, or an external load connected to the buckle via a wire harness. That is, the electric power generated by the power generation unit 11 can be used as the electric power for operating the transmission unit 41, the electric power for operating the sensor, the electric power for lighting the lamp, the electric power for operating the external load, and the like. Specific examples of the power storage unit include a capacitor and a secondary battery. Any of the capacitors 20, 33, and 35 may be used as such a power storage unit.

The sensor provided on the buckle is, for example, an occupant detection sensor that detects an occupant on a vehicle seat in a non-contact manner by transmitting and receiving electromagnetic waves. For example, the occupant detection sensor transmits an electromagnetic wave toward the upper part of the seat surface of the vehicle seat and receives a reflected wave for the transmitted electromagnetic wave to determine the presence or absence of an occupant on the seat surface and the heart rate of the occupant. Detects biological information such as. Specific examples of electromagnetic waves include radio waves such as microwaves in the SHF (Super High Frequency) band, infrared rays having a frequency higher than that of radio waves, and the like.

The occupant detection sensor is an example of a detection unit provided on the buckle to detect a predetermined state. The transmission unit 41 may wirelessly transmit the biological information detected by the occupant detection sensor by using the electric power generated by the power generation unit 11. That is, the transmission unit 41 may wirelessly transmit at least one of the biometric information and the insertion / extraction information by using the electric power generated by the power generation unit 11. Further, the information wirelessly transmitted by the transmission unit 41 may include information other than biological information and insertion / extraction information.

11 Power generation unit 36 Buckle switch 37 Resistance 38 Control circuit 39 Transmitter 40 Antenna 41 Transmission unit 42 Internal power supply line 51-54 Wiring 100,200 Seatbelt reminder system 101 Seatbelt device 103,130,230 Retractor 104 Seatbelt 107 Tongue 108, 180,280 buckle

Claims (6)

With seat belts
The tongue attached to the seat belt and
The buckle from which the tongue is inserted and removed,
The retractor that winds up the seat belt and
A power generation unit provided on the retractor and generating electricity by pulling out the seat belt from the retractor or winding it around the retractor.
A detection unit provided on the buckle to detect a predetermined state,
A seatbelt device including a transmission unit that wirelessly transmits information about a state detected by the detection unit using the electric power generated by the power generation unit. The transmitter is provided on the buckle.
The seatbelt device according to claim 1, wherein the electric power is input from the retractor to the buckle via wiring. The buckle has an internal power supply line connected between the wiring and the transmission unit, and a resistor connected between the internal power supply line and the detection unit.
The seatbelt device according to claim 2, wherein the signal representing the state detected by the detection unit is input to the transmission unit from between the resistor and the detection unit. The transmitter is provided on the retractor.
The seatbelt device according to claim 1, wherein a signal representing a state detected by the detection unit is input from the buckle to the retractor via wiring. The retractor has an internal power supply line connected between the power generation unit and the transmission unit, and a resistor connected between the internal power supply line and the wiring.
The seatbelt device according to claim 4, wherein the signal representing the state detected by the detection unit is input to the transmission unit from between the resistor and the wiring. The seatbelt device according to any one of claims 1 to 5, wherein the predetermined state includes an insertion / removal state of the tongue and the buckle.