JP2010108128A - Warning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively issue a warning to a driver. <P>SOLUTION: In a vehicle with an occupant protection device for operating a headrest by driving a headrest actuator when collision is predicted, a warning device includes a monitoring camera for monitoring a sitting occupant and monitors a sitting occupant (300). When detecting the abnormality of a driver such as drowsy driving or inattentive driving, the warning device: issues a warning by driving the headrest actuator and stimulating the head of the sitting occupant (302, 304); detects the contact of the head to the headrest by an electrostatic sensor; and generates a warning sound by a warning generator when there is no contact (S306, 308). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an alarm device, and more particularly, to an alarm device that is provided in a vehicle and issues an alarm to a passenger's snoozing driving or the like.

  For example, a technique described in Patent Document 1 has been proposed as an alarm device that is installed in a vehicle and issues an alarm for a drowsy driving or the like.

In the technology described in Patent Document 1, a vibration or impact generator is embedded in the seat of the driver's seat, and an alarm sound generator is embedded in the headrest or the backrest or in the ceiling plate on the driver's head, Proposed to activate the vibration / blow generator in the seat to activate the vibration / blow in the vicinity of the driver's buttocks and stimulate the driver's wake by generating a warning sound. Has been.
JP-A-7-195957

  However, in Patent Document 1, since the switch is turned on according to the driver's will, there is room for improvement because the alarm device does not operate unless the driver operates the switch.

  Furthermore, in the technique described in Patent Document 1, vibration or striking is given to the buttocks far from the driver's head, and there is room for improvement in order to perform an effective alarm.

  The present invention has been made in consideration of the above facts, and an object thereof is to effectively give a warning to a driver.

  In order to achieve the above object, the invention according to claim 1 is based on monitoring means for monitoring a seated occupant, drive means for driving a headrest movable to the seated occupant side, and a monitoring result of the monitoring means. And a control means for controlling the driving means so that the headrest moves toward the seated occupant when it is necessary to give an alarm to the seated occupant.

  According to the first aspect of the present invention, the monitoring means monitors the seated occupant. For example, the seated occupant is monitored by photographing the seated occupant with a monitoring camera or the like.

  Moreover, the headrest which can move to the seating occupant side can be moved by driving the drive means.

  Then, the control means controls the driving means so that the headrest moves to the seated occupant side when it is necessary to give an alarm to the seated occupant based on the monitoring result of the monitoring means. For example, the control means controls the driving means to control the headrest on the side of the seated occupant when the driver detects that the occupant is falling asleep or looks aside from the monitoring result of the monitoring means. By moving to, the headrest of the seated occupant can be stimulated by the headrest to give an alarm. Accordingly, the head of the seated occupant is stimulated, so that an alarm can be effectively performed.

  In addition, as in the second aspect of the present invention, the vehicle further includes detection means for detecting contact or proximity of the headrest to the head of the seated occupant due to movement of the headrest, and the drive means includes a collision prediction means for predicting a collision. When a collision is predicted by the driving means that is driven until the detection means detects contact or proximity of the headrest to the head, and the control means needs to warn the seated occupant The driving means may be controlled until a predetermined amount of movement or a predetermined time elapses after the detection means detects the contact or proximity of the headrest to the head. That is, an alarm may be performed using a headrest that operates at the time of collision prediction. This makes it possible to share components.

  Further, the invention according to claim 1 or claim 2 further includes alarm means for audibly issuing an alarm to a seated occupant, as in the invention according to claim 3, wherein the control means monitors the monitoring means. Based on the result, the alarm means may be further controlled so as to issue an alarm when it is necessary to issue an alarm to the seated occupant. An alarm means for issuing an alarm to the seated occupant is further provided, and the control means needs to give an alarm to the seated occupant after performing the control of the driving means when it is necessary to alert the seated occupant a predetermined number of times. In some cases, the alarm means may be further controlled to issue an alarm. As a result, not only a stimulus to the head but also an audible alarm can be given.

  Further, in the invention of claim 2, as in the invention of claim 5, it further comprises alarm means for audibly issuing an alarm to the seated occupant, and when the control means controls the drive means, the detection means If the contact or proximity of the headrest to the head is not detected, the alarm means may be further controlled to issue an alarm. Thus, even when the head is not within the headrest operating range due to the posture of the seated occupant, a warning can be reliably issued.

  As described above, according to the present invention, when it is necessary to monitor a seated occupant and give an alarm to the seated occupant, the headrest can be moved to give a stimulus to the head. There is an effect that the alarm can be effectively performed.

Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram showing a schematic vehicle mounting position of an occupant protection device provided in a vehicle on which an alarm device according to the first embodiment of the present invention is mounted.

  The vehicle equipped with the alarm device according to the first embodiment of the present invention is equipped with an occupant protection device, and the occupant protection device detects a distance to an obstacle ahead as shown in FIG. A front millimeter wave radar 12 for detecting the distance to the front obstacle, a front side millimeter wave radar 14 for detecting the distance to the front obstacle, a stereo camera 16 for photographing the front, and a rear millimeter for detecting the distance to the rear obstacle. A wave radar 18, a rear side millimeter wave radar 20 for detecting a distance to an obstacle on the rear side, and a collision determination ECU (Elecgtronic Control Unit) 22 are provided. The front millimeter wave radar 12, the front side millimeter wave radar 14, the stereo camera 16, the rear side millimeter wave radar 18, and the rear side millimeter wave radar 20 monitor the vehicle periphery and output the monitoring result to the collision determination ECU 22.

  The front millimeter wave radar 12 is provided, for example, near the center of the front grille, and the front side millimeter wave radar 14 is provided near both ends in the vehicle width direction in the bumper, and emits millimeter waves to the front and front sides of the vehicle, respectively. Thus, it is provided to receive the radio wave reflected from the object and to measure the distance to the object, the relative speed with the own vehicle, and the like based on the propagation time and the frequency difference caused by the Doppler effect. Further, the rear millimeter wave radar 18 and the rear side millimeter wave radar 20 are provided in a rear bumper or the like, and receive the radio waves reflected from the object by emitting millimeter waves to the rear and rear sides of the vehicle, It is provided to measure the distance to the object, the relative speed with the host vehicle, and the like based on the propagation time and the frequency difference caused by the Doppler effect.

  The stereo camera 16 is provided in the vicinity of the center above the front windshield glass, and is provided for photographing the front of the vehicle to detect surrounding obstacles and to measure the distance to the obstacles. Note that the stereo camera 16 may be omitted.

  Then, the collision determination ECU 22 obtains detection results of the front millimeter wave radar 12, the front side millimeter wave radar 14, the stereo camera 16, the rear millimeter wave radar 18, and the rear side millimeter wave radar 20, and performs collision prediction. Since various known techniques can be applied to the collision prediction, detailed description is omitted.

  In addition, the occupant protection device according to the embodiment of the present invention includes a headrest that can be shifted to the seated occupant side, and seat control that controls the operation of the headrest 24 when a rear collision is predicted by the collision determination ECU 22. The ECU 26 is further provided. Specifically, when a rear collision is predicted, the seat control ECU 26 moves the headrest 24 toward the occupant's head and suppresses the movement of the occupant's head in the event of a collision. It comes to protect. In addition to the headrest 24, the seat control ECU 26 may further control the inclination angle of the seat back 28 and the like according to the collision prediction.

  FIG. 2 is a diagram for explaining an alarm device according to the first embodiment of the present invention.

  The alarm device according to the first embodiment of the present invention includes a monitoring camera 30 for detecting an abnormality of a seated occupant, and the seated occupant takes a drowsy driving operation from the photographed result. When the abnormality of the seated occupant (driver) is detected by detecting whether or not he / she is driving aside, as shown by the dotted line in FIG. 2, the headrest is detected. 24 is actuated toward the head of the seated occupant, and the head of the seated occupant is stimulated by the headrest 24 so as to call attention.

  For example, as shown in FIG. 2, the monitoring camera 30 may be arranged on a steering column, or may be arranged on a ceiling or the like.

  FIG. 3 is a block diagram showing a configuration of a control system including the alarm device according to the first embodiment of the present invention and the above-described occupant protection device.

  The seat control ECU 26 is connected to the bus 32 as shown in FIG. 3, and the seat control ECU 26 is in contact with or close to the headrest actuator 34 for operating the headrest 24 and the head of the seated occupant. An electrostatic sensor 36 for detection is connected.

  The bus 32 is connected to a collision determination ECU 22 and is connected to a front millimeter wave radar 12, a front side millimeter wave radar 14, a stereo camera 16, a rear millimeter wave radar 18, and a rear side millimeter wave radar 20. Has been.

  The bus 32 is connected to an alarm control ECU 10 that performs control for detecting an abnormality of the seated occupant and issuing an alarm. The alarm control ECU 10 is connected to the monitoring camera 30 described above and an alarm generator 38 that emits an alarm sound (may be an alarm announcement) to the occupant.

  Here, the process performed by the above-described collision determination ECU 22 will be described. FIG. 4 is a flowchart illustrating an example of a flow of processing performed by the collision determination ECU 22.

  In step 100, the distance to the front obstacle is input, and the process proceeds to step 102. That is, detection results of the front millimeter wave radar 12, the front side millimeter wave radar 14, the stereo camera 16, and the like are input.

  In step 102, the relative speed is calculated, and the routine proceeds to step 104. For example, the relative speed is calculated from the distance to the front object detected every predetermined time by the millimeter wave radar. Note that the relative speed may be calculated by obtaining the distance by performing image processing on the imaging result of the stereo camera 16.

  In step 104, the detection result of the millimeter wave radar is newly input, and the process proceeds to step 106.

  In step 106, a time t until the collision is calculated, and the process returns to step 100 and the above-described processing is repeated. That is, the distance to the front object detected by the front millimeter wave radar 12, the front side millimeter wave radar 14, the stereo camera 16 and the like and the time t from the relative speed calculated in step 102 to the collision are calculated. It returns and the above-mentioned processing is repeated.

  That is, in this embodiment, collision prediction is performed by calculating the collision prediction time. For the collision prediction, other methods may be applied instead of calculating the collision prediction time.

  Subsequently, processing performed by the seat control ECU 26 in accordance with the collision prediction by the collision determination ECU 22 will be described. FIG. 5 is a flowchart illustrating an example of a flow of processing performed by the seat control ECU 26. The process in FIG. 5 starts when an ignition switch (not shown) is turned on, and ends when a collision is detected by a collision detection sensor or the like provided on the bumper or the like when the ignition switch is turned off. explain.

  In step 200, the collision prediction time t calculated by the collision determination ECU 22 is input, and the process proceeds to step 202.

  In step 202, it is determined whether or not the predicted collision time t is less than a predetermined time t1, and if the determination is affirmative, the process proceeds to step 204, and if the determination is negative, the process proceeds to step 216.

  In step 204, it is determined whether or not the collision prediction is backward prediction. This determination is detected by the front millimeter wave radar 12, the front side millimeter wave radar 14, the stereo camera 16, the rear millimeter wave radar 18, the rear side millimeter wave radar 20 and the like when the collision prediction ECU 22 calculates the collision prediction time. It is determined whether or not the direction of the obstacle is backward. If the determination is negative, the collision prediction is determined to be a forward collision, and the process proceeds to step 206. If the determination is affirmative, the process proceeds to step 208.

  In step 206, a forward collision process is performed, the process returns to step 200, and the above-described process is repeated. As the front collision process, for example, in the case of a configuration in which the inclination angle of the seat back 28 is adjusted, a process of controlling the angle of the seat back to be within an appropriate range is performed.

  On the other hand, in step 208, it is determined whether or not the headrest 38 is being driven. This determination is made as to whether or not the headrest actuator 34 has already started to be driven after step 210 described later. If the determination is negative, the process proceeds to step 210. If the determination is affirmative, step 210 is performed. Move to 212.

  In step 210, driving of the headrest actuator 34 is started, and the process returns to step 200 and the above-described processing is repeated.

  In step 212, it is determined whether or not the seated occupant head is close to the headrest 38. This determination is made by determining whether the seated occupant's head is close to or in contact with the headrest 38 by determining whether or not the detection result of the capacitance sensor 36 is equal to or greater than a predetermined value. Shifts to step 214. If the determination is negative, the flow returns to step 200 and the above-described processing is repeated.

  In step 214, the driving of the headrest actuator 34 is stopped, and the process returns to step 200 and the above-described processing is repeated.

  On the other hand, if the predicted collision time t is greater than or equal to time t1 and the process proceeds to step 216, it is determined whether or not the headrest 38 is being driven. That is, it is determined whether or not the collision prediction time t is less than the time t1 and the headrest 38 has started to be driven. If the determination is affirmative, the process proceeds to step 218. Returning to 200, the above-described processing is repeated.

  In step 218, since the headrest actuator 34 is driven, the headrest actuator 34 is reset to stop driving the headrest actuator 34, and the process returns to step 200 to repeat the above processing. As a reset, when the headrest actuator 34 is driven, the headrest actuator 34 is driven so as to return to the state of the headrest 38 before the headrest actuator 34 is driven.

  Thus, in the present embodiment, when a rear collision is predicted, the headrest 24 is operated by controlling the driving of the headrest actuator 34. Therefore, in the case of a collision, the headrest 24 moves the seated occupant's head. It is suppressed by the operation of, and damage to the occupant can be suppressed to protect the occupant.

  Next, an example of the flow of processing performed by the alarm control ECU 10 of the alarm device according to the first embodiment of the present invention will be described. FIG. 6 is a flowchart illustrating an example of a flow of processing performed by the alarm control ECU 10 of the alarm device according to the first embodiment of the present invention.

  In step 300, the photographing result of the monitoring camera 30 is acquired by the alarm control ECU 10, and the process proceeds to step 302.

  In step 302, it is determined by the alarm control ECU 10 whether or not a driver abnormality is detected. The determination is performed by, for example, performing image processing on a captured image captured by the monitoring camera 30 to detect whether the seated occupant's eyes have been opened or closed, and determining whether the eye-closed state has passed for 2 seconds or more. It is determined whether or not the time during which the camera is facing in a direction other than the front has exceeded a predetermined time or the like. If the determination is affirmative, the process proceeds to step 304. If the determination is negative, the process proceeds to step 310.

  In step 304, the headrest operation process is performed by the alarm control ECU 10, and the process proceeds to step 306. In the headrest operation process, for example, the alarm control ECU 10 controls the seat control ECU 26 so that the headrest actuator 34 is driven so that the headrest 24 hits the head of the seated occupant several times. In the present embodiment, the seat control ECU 26 receives an instruction from the alarm control ECU 10 and detects the head of the seated occupant by the electrostatic sensor 36, and then drives the headrest actuator to drive a predetermined amount (for example, 20 mm) or a predetermined time. After driving 34, the headrest actuator 34 is driven so that the headrest 24 again hits the head of the occupant. Thus, an alarm can be given when the occupant is driving asleep or driving aside. At this time, since the headrest 24 gives a stimulus to the seated occupant's head, the occupant can be awakened more effectively than a stimulus to the occupant's body when driving asleep.

  In step 306, it is determined by the alarm control ECU 10 whether the headrest 24 has contacted the head. This determination is performed by acquiring the detection result of the electrostatic sensor 36 via the seat control ECU 26 and the alarm control ECU 10 determining whether or not the detection result of the electrostatic sensor 36 has reached a predetermined threshold value or more. Is determined to be in contact with or close to the head. If the determination is negative, the process proceeds to step 308. If the determination is negative, the process proceeds to step 310.

  In step 308, the alarm control ECU 10 controls the alarm generator 38 to generate an alarm sound, and the process proceeds to step 310. That is, since the headrest 24 did not contact the head of the seated occupant, the alarm by the headrest 24 could not be made, so an alarm with an alarm sound is given. As a result, it is possible to effectively warn for a drowsy driving or a side-by-side driving. The alarm sound generated by the alarm generator 38 may be a predetermined alarm announcement.

  In step 310, it is determined by the alarm control ECU 10 whether or not the ignition switch has been turned off. If the determination is negative, the process returns to step 300 and the above-described processing is repeated. Terminate the process.

  As described above, in this embodiment, when an abnormality is detected by monitoring an abnormality such as a driver's dozing operation or a side-viewing operation, the headrest 24 is activated and an alarm is issued, so that it is more effective than stimulating the body. Can alert the passengers.

  Moreover, in this embodiment, the components can be shared by using a system that operates the headrest 24 included in the occupant protection device as an alarm.

Furthermore, in the case of a occupant's drowsy driving or the like, the headrest 24 may not reach the occupant's head, but in this case, an alarm sound is generated by the alarm generator 38, so the alarm is reliably given. be able to.
(Second Embodiment)
Next, an alarm device according to the second embodiment of the present invention will be described. In addition, since this embodiment differs only in the process performed by alarm control ECU10 of the alarm device concerning 1st Embodiment, only the process performed by alarm control ECU10 is demonstrated. Further, since the configuration is basically the same as that of the first embodiment, the same reference numerals are used for explanation.

  FIG. 7 is a flowchart showing an example of a flow of processing performed by the alarm control ECU 10 of the alarm device according to the second embodiment of the present invention.

  In step 400, the flag F is set to 0 by the alarm control ECU 10, and the routine proceeds to step 402. Note that the flag F is a flag for confirming the number of times that the headrest 24 is actuated to warn the seated occupant.

  In step 402, the acquisition result of the monitoring camera 30 is started by the alarm control ECU 10, and the process proceeds to step 404.

  In step 404, the alarm control ECU 10 determines whether or not a driver abnormality is detected. The determination is performed by, for example, performing image processing on a captured image captured by the monitoring camera 30 to detect whether the seated occupant's eyes have been opened or closed, and determining whether the eye-closed state has passed for 2 seconds or more. It is determined whether or not the vehicle is directed in a direction other than the front for a predetermined time or more. If the determination is affirmative, the process proceeds to step 406. If the determination is negative, the process proceeds to step 424.

  In step 406, it is determined by the alarm control ECU 10 whether the driver abnormality is detected for the first time or the second time. The determination determines whether the flag F is 0 or 1. If the determination is affirmative, the process proceeds to step 408, and if the determination is negative, the process proceeds to step 418.

  In step 408, the alarm control ECU 10 controls the driving of the headrest actuator 34 via the seat control ECU 26, whereby the headrest 24 is actuated around several times and the process proceeds to step 410. The operation of the headrest 24 is returned after the headrest actuator 34 is driven so as to be driven for a predetermined amount (for example, 20 mm) or for a predetermined time after the head of the occupant is detected by the electrostatic sensor 36 as in the first embodiment. Then, the headrest actuator 34 is driven so that the headrest 24 again hits the head of the passenger. Thus, an alarm can be given when the occupant is driving asleep or driving aside. At this time, since the headrest 24 gives a stimulus to the seated occupant's head, the occupant can be awakened more effectively than a stimulus to the occupant's body when driving asleep.

  In step 410, it is determined whether or not the driver abnormality is detected for the second time. This determination determines whether or not the flag F is 1. If the determination is affirmative, the process proceeds to step 412, and if the determination is negative, the process proceeds to step 414.

  In step 412, the alarm generator 38 is controlled by the alarm control ECU 10 to generate a voice announcement, and the process proceeds to step 414. For example, a message such as “Please take a break at the nearest parking place” is issued.

  In step 414, the flag F is incremented and the routine proceeds to step 416.

  In step 416, it is determined by the alarm control ECU 10 whether or not a predetermined time has elapsed since the first or second driver abnormality is detected. If the determination is negative, the process returns to step 404 to perform the above-described processing. Is repeated and if the determination is affirmative, the routine proceeds to step 424. The predetermined time is a time for checking the effect of the alarm after the headrest 24 is driven, and is, for example, several minutes (for example, 3 minutes).

  On the other hand, if the determination in step 406 is negative, that is, if the abnormality of the driver is detected for the third time, the process proceeds to step 418, and the driving of the headrest actuator 34 is controlled by the alarm control ECU 10 via the seat control ECU 26. Accordingly, the headrest 24 is driven to vibrate after being actuated several times before and after, and the process proceeds to step 420. The operation of the headrest 24 is returned after the headrest actuator 34 is driven so as to be driven for a predetermined amount (for example, 20 mm) or for a predetermined time after the head of the occupant is detected by the electrostatic sensor 36 in the same manner as in Step 408. The headrest actuator 34 is driven so that the headrest 24 again hits the head of the seated occupant. Further, in the state where the head of the seated occupant is in contact with the headrest 24, the drive of the headrest actuator 34 is reversed in the forward and backward directions so that the headrest 24 vibrates. Thus, an alarm can be given when the seated occupant is driving asleep or driving aside. At this time, since the vibration is also performed in addition to the operation of the headrest 24 at the first and second alarms, the alarm can be performed more effectively.

  In step 420, it is determined again by the alarm control ECU 10 whether a driver abnormality has been detected. If the determination is affirmative, the routine proceeds to step 418, where the headrest 24 is driven to give an alarm, and the determination is negative. If so, the process proceeds to step 422.

  In step 422, the alarm control ECU 10 controls the alarm generator 38 to generate a voice announcement, and the process proceeds to step 424. For example, a message such as “Please take a break at the nearest parking place” is issued.

  In step 424, the flag F is initialized to 0, and the process proceeds to step 422.

  In step 426, it is determined by the alarm control ECU 10 whether or not the ignition switch is turned off. If the determination is negative, the process returns to step 404 and the above processing is repeated, and the determination in step 426 is affirmed. By the way, a series of processing is completed.

  That is, in this embodiment, when a driver abnormality is detected, an alarm is given to the occupant by operating the headrest 24 as in the first embodiment, and the driver abnormality is detected twice during a predetermined time. When an alarm is issued, a break is urged by an announcement. When the alarm is detected three times, a strong alarm is given by further applying vibration to the operation of the headrest 24. By controlling in this way, as in the first embodiment, when an abnormality is detected by monitoring an abnormality such as a passenger's dozing or aside driving, the headrest 24 is activated and an alarm is given. It is possible to alert the occupant more effectively than to give a stimulus.

  Also in this embodiment, as in the first embodiment, it is possible to share components by using a system that operates the headrest 24 included in the occupant protection device as an alarm.

  In the present embodiment, the alarm generator 38 generates an alarm sound (alarm announcement) when the headrest 24 is operated and the alarm is issued a predetermined number of times (in this embodiment, twice). An alarm can be reliably performed.

  Furthermore, in the present embodiment, the alarm is performed by moving the headrest 24 back and forth several times until a predetermined number of times (two times in the present embodiment), and when further alarming is performed from the predetermined number of times (this example) In the embodiment, the third time), the headrest 24 is moved back and forth several times and the headrest 24 is operated so as to be further vibrated, so that the alarm can be performed more effectively.

  In each of the above embodiments, the alarm device is provided on the vehicle on which the occupant protection device that operates the headrest 24 is mounted. However, the present invention is not limited to this, and the headrest 24 is mounted without the occupant protection device. Only a configuration that operates may be provided as an alarm device.

  In each of the above embodiments, the alarm is generated by operating the headrest 24. However, the alarm generator 38 may generate an alarm sound simultaneously with the operation of the headrest 24. In this case, in the first embodiment, when the headrest 24 does not contact the head, a sound or announcement different from the alarm sound at the time of operation of the headrest 24 is emitted. If the alarm needs to be performed even if it is activated, a sound or announcement different from the alarm sound when the headrest 24 is activated may be emitted.

It is a figure which shows the general vehicle mounting position of the passenger | crew protection device provided in the vehicle by which the alarm device concerning 1st Embodiment of this invention is mounted. It is a figure for demonstrating the alarm device concerning 1st Embodiment of this invention. It is a block diagram which shows the structure of the control system containing the alarm device concerning 1st Embodiment of this invention, and the above-mentioned occupant protection device. It is a flowchart which shows an example of the flow of the process performed by collision judgment ECU. It is a flowchart which shows an example of the flow of the process performed by seat control ECU. It is a flowchart which shows an example of the flow of the process performed by alarm control ECU of the alarm device concerning 1st Embodiment of this invention. It is a flowchart which shows an example of the flow of the process performed by alarm control ECU of the alarm device concerning 2nd Embodiment of this invention.

Explanation of symbols

10 Alarm control ECU
12 Front millimeter wave radar 14 Front side millimeter wave radar 16 Stereo camera 18 Rear millimeter wave radar 20 Rear side millimeter wave radar 22 Collision judgment ECU
24 headrest 26 seat control ECU
30 Monitoring Camera 34 Headrest Actuator 36 Capacitance Sensor 38 Alarm Generator

Claims (5)

Monitoring means for monitoring seated occupants;
Driving means for driving a headrest movable to the seated occupant side;
Control means for controlling the drive means so that the headrest moves to the seated occupant side when it is necessary to warn the seated occupant based on the monitoring result of the monitoring means;
Alarm device with.   The detection unit further includes a detection unit that detects contact or proximity of the headrest to a head of a seated occupant due to movement of the headrest, and the detection is performed when a collision is predicted by a collision prediction unit that predicts a collision. Drive means that is driven until contact or proximity of the headrest to the head is detected by the means, and when the control means needs to warn a seated occupant, the detection means 2. The alarm device according to claim 1, wherein the driving unit is controlled until a predetermined amount of movement or a predetermined time elapses after contact or proximity of the headrest to the head is detected.   Alarm means for audibly alerting the seated occupant is further provided, and the control means is configured to alert the seated occupant when an alarm is required based on a monitoring result of the monitoring means. The alarm device according to claim 1 or 2, further controlling the means.   An alarm means for audibly alerting the seated occupant is further provided, and the control means alerts the seated occupant after performing the control of the driving means when the alarm needs to be given to the seated occupant a predetermined number of times. The alarm device according to claim 1 or 2, further controlling the alarm means so as to issue an alarm when it is necessary to perform the operation.   Alarm means for audibly alerting the seated occupant, and when the control means does not detect contact or proximity of the headrest to the head by the detection means when the drive means is controlled, 3. The alarm device according to claim 2, further controlling the alarm means to perform.

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