JP2019123263A - Notification device and notification system - Google Patents

Abstract

To transmit notification information to a seating subject by vibration of a seat exactly.SOLUTION: In a notification device 6 which transmits the notification information to a crew member U by vibration of a vibration part 20 correspondent to the notification information among a plurality of vibration parts 20 disposed to dot around a seat surface 18 of a seat 4 with which a body of the crew member U which is the seating subject can be contacted, it is configured to comprises a pressure measurement part 62 which measures pressure caused to the seat surface 18 and a vibration change part 56 which alters respective vibrations of the vibration part 20 correspondent to the notification information on the basis of pressure distribution measured by the pressure measurement part 62.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a notification device and a notification system.

  BACKGROUND Conventionally, there is known a driving support device that transmits driving support information to a driver by providing a vibrating member on a driving seat of a vehicle and vibrating these (see, for example, Patent Document 1 and Patent Document 2).

JP, 2010-128667, A Unexamined-Japanese-Patent No. 2017-22442

However, depending on the posture or the like of the seated person sitting on the seat such as the driver's seat, transmission of vibration to the seated person may be insufficient and notification information may not be properly transmitted to the seated person.
An object of the present invention is to provide an informing device and an informing system capable of accurately notifying informing information to a seated person.

  The present invention is a notification that transmits the notification information to the seat occupant by the vibration of the vibration unit corresponding to notification information among a plurality of vibration units arranged on the sheet surface of the seat to which the body of the seat contact can contact. An apparatus, comprising: a pressure measurement unit that measures a pressure generated on the sheet surface; and a vibration that changes each vibration of the vibration unit corresponding to the notification information based on a pressure distribution measured by the pressure measurement unit. And a change unit.

  Still preferably, in the notification device, the vibration changing unit does not vibrate the vibration unit disposed in a range in which the pressure is lower than a first threshold among the vibration units corresponding to the notification information. It is characterized by

  Still preferably, in the notification device according to the present invention, the vibration changing unit further includes a pressure range equal to or higher than a second threshold that is a threshold of the pressure at which the vibration of the vibrating unit is suppressed among the vibrating units corresponding to the notification information. And the vibration unit disposed in the housing is not vibrated.

  Still preferably, in a case where the pressure is not arranged in the range from the first threshold to the second threshold, the vibration changing unit according to the present invention is any of the vibration changing units corresponding to the notification information. It is characterized by vibrating the other vibration part near the said vibration part corresponding to alerting | reporting information.

  The present invention relates to the notification device, wherein the vibration changing unit is configured to maintain a constant stimulus given to the seated person by the vibration of the vibrating unit based on the pressure of the portion where the vibrating unit is disposed. The vibration mode of the vibration unit is changed.

  The present invention, in the above notification device, includes a pressure distribution specifying unit that specifies a pressure distribution of the sheet surface based on a combination of movable states of the movable portion, and the sheet surface of the sheet includes a plurality of movable portions. It is characterized by having.

  The present invention comprises a sheet in which a plurality of vibrating portions are scattered and disposed on a sheet surface of a sheet to which a seated person's body can come in contact, and vibrates the vibrating portions corresponding to notification information among the plurality of vibrating portions. And a notification system for transmitting the notification information to the seated person, wherein vibration based on the pressure distribution generated on the seat surface by the contact of the seated person changes the vibration of the vibration unit corresponding to the notification information. A change unit is provided.

  According to the present invention, notification information can be accurately transmitted to a seated person.

It is a figure which shows typically the structure of the alerting | reporting system which concerns on embodiment of this invention. It is a figure showing an example of composition of a sheet. It is a figure which shows typically the structure which concerns on a vibration of a sheet | seat. It is a block diagram which shows the functional structure of a alerting | reporting system. It is a figure which shows an example of correspondence of a sheet | seat surface, a vibration area, and alerting | reporting information. It is a flowchart which shows operation | movement of a alerting | reporting system. It is a figure which shows the relationship between the adjustment state of the backrest surface of a seat, and pressure distribution.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a view schematically showing a configuration of a notification system 1 according to the present embodiment.
The notification system 1 is mounted on the vehicle 2 and transmits notification information to an occupant U such as a driver, and includes a notification information output unit 3, a seat 4 on which the occupant U sits, and an notification device 6. There is.
The notification information output unit 3 generates notification information according to the traveling condition of the vehicle 2 and the like, and outputs a notification signal for requesting output of the notification information to the notification device 6. The seat 4 is configured to be able to vibrate based on the control of the notification device 6, and when the notification device 6 vibrates the seat 4 based on the notification signal, notification information is transmitted to the occupant U by vibration. In the following, the seat 4 will be described using the front seat of the vehicle 2 as an example.

FIG. 2 is a view showing an example of the configuration of the seat 4.
The seat 4 of the present embodiment includes a seat cushion 8 which is a seating portion of the occupant U, a seat back 10 which is a backrest portion, and a headrest 12 provided on an upper portion of the seat back 10. Each of the seat backs 10 is provided with side support portions 14 and 16 that prevent lateral displacement of the occupant U by sandwiching both sides of the occupant U in the width direction.

Further, each part of the seat 4 is configured such that the position and posture thereof can be adjusted in accordance with the size and preference of the occupant U's own body.
Specifically, the seat cushion 8 is configured to be movable in the front-rear direction in the vehicle compartment, and pivots around the rear end 8A2 to change the height of the front end 8A1 of the seat surface 8A. The inclination of the seat surface 8A can be changed. Further, the seat back 10 is configured to be rotatable about the lower end portion 10A1 to change the inclination of the backrest surface 10A, and the headrest 12 is configured to be able to change the height position, and each of the side support portions 14 and 16 The posture of is also configured to be adjustable.

FIG. 3 is a view schematically showing a configuration relating to the vibration of the sheet 4.
As shown in the figure, inside the sheet 4, a large number of vibration units 20 are disposed in a scattered manner. The vibration unit 20 emits vibration under the control of the notification device 6, and includes a speaker called a subwoofer that outputs a deep bass (bass band). As this speaker, a suitable speaker such as a dynamic type speaker using cone paper or the like, or an exciter which vibrates a contact surface to output sound or vibration is used.
The notification device 6 selectively vibrates the vibration unit 20 by inputting a vibration output signal, which is a sound source for vibrating the speaker, to the vibration unit 20 to be vibrated. As the vibration output signal, for example, an appropriate signal such as a sine wave signal or a sweep signal (a signal obtained by stepwise changing the frequency of the output sound) is used.

Among the seats 4, the vibrating portions 20 are dispersedly disposed over the entire area of the seat surface 18 which is a surface with which the body of the occupant U can come in contact. In the present embodiment, the seat 4 includes, as the seat surface 18, the seat surface 8A of the seat cushion 8, the backrest surface 10A of the seatback 10, and the front surface 12A of the headrest 12. Dottedly placed.
Further, a sheet-like pressure detection device 24 is provided on the sheet 4 so as to cover the entire area of the sheet surface 18. The pressure detection device 24 detects the pressure in the surface of the seat surface 18 and outputs the pressure to the notification device 6, and, for example, includes a number of pressure sensors regularly arranged on the surface of the pressure detection device 24. There is.

FIG. 4 is a block diagram showing a functional configuration of the notification system 1.
As described above, the notification information output unit 3 generates notification information according to the traveling condition of the vehicle 2 and the like, and outputs to the notification device 6 a notification signal requesting the notification device 6 to output the notification information. . The notification information includes appropriate information related to the traveling of the vehicle 2. For example, vehicle deviation information indicating that the vehicle 2 has deviated from the lane, vehicle approaching information indicating that another vehicle is approaching behind the vehicle 2, a sharp curve or an obstacle in the planned travel route, etc. And warning information such as a curve indicating that the driver is approaching, drowsy information notifying the drowsiness of the driver, and arrival information notifying arrival at a predetermined destination.
The notification information output unit 3 has a method of capturing an image around the vehicle 2 for image analysis, a method of detecting other vehicles around by irradiating a radar wave and measuring a reflected wave, and a driver's condition. The traveling condition of the vehicle 2 is detected by various commonly used methods such as a method of detecting by image analysis, a method of obtaining various information from a navigation device, a vehicle sensor, an ECU of the vehicle 2 or the like. The broadcast information of is generated.

The notification device 6 includes a signal control unit 50, a vibration control unit 52, an amplification unit 54, and a vibration change unit 56, and is configured by a computer having a processor such as a CPU or an MPU.
When receiving the notification signal from the notification information output unit 3, the signal control unit 50 selects the vibration unit 20 to be vibrated based on the notification signal. More specifically, in the present embodiment, not all the vibrating portions 20 of the sheet 4 vibrate regardless of the notification information, but the sheet surface 18 of the sheet 4 is divided into a plurality of vibration areas, and vibration is generated. A vibration area to be caused is determined for each of the notification information.

FIG. 5 is a view showing an example of the correspondence between the seat surface 18, the vibration area, and the notification information.
As shown in the figure, in the present embodiment, the seat surface 8A of the seat cushion 8 and the backrest surface 10A of the seatback 10 in the seat surface 18 are side support vibration areas corresponding to the left and right side support portions 14 and 16, respectively. , It is divided into other central vibration area. Further, the central vibration area is divided into a central vibration area of the seat surface belonging to the seat surface 8A and a central vibration area of the backrest surface belonging to the backrest surface 10A.
Further, the entire front surface 12A of the headrest 12 in the seat surface 18 is divided as one headrest vibration area.

The side support vibration area is associated with the vehicle deviation information, and when the vehicle deviation information is notified, the vibration area corresponding to the lane on which the vehicle 2 deviates is designated among the left and right side support vibration areas among the left and right side support vibration areas And all the vibration units 20 arranged in the vibration area are selected as vibration targets.
Of the central vibration area, the backrest surface central vibration area is associated with the vehicle approach information, and is disposed in the backrest surface central vibration area when another vehicle approaches the rear of the vehicle 2 or the like. All vibration units 20 are selected as vibration targets.
In the central vibration area, the seat surface central vibration area and the headrest vibration area are associated with the drowsiness information, and when the driver is detected drowsy, the seat surface central vibration area of the driver's seat 4, And all the vibration parts 20 arrange | positioned in a headrest vibration area are selected as vibration object.

  Of course, the correspondence shown in FIG. 5 is merely an example and can be appropriately changed.

  Referring back to FIG. 4, the vibration control unit 52 generates the above-described vibration output signal to be output to the vibration unit 20 of the vibration target selected by the signal control unit 50, and outputs the generated vibration output signal to the amplification unit 54. The amplification unit 54 amplifies the vibration output signal and outputs the amplified signal to each of the vibration units 20 to be vibrated in the sheet 4. When the vibration unit 20 vibrates based on the vibration output signal, the notification information is notified to the occupant U.

  The vibration changing unit 56 changes the vibrating unit 20 to be vibrated based on the pressure distribution on the sheet surface 18 of the sheet 4, and the vibration of the vibrating unit 20 is based on the pressure at the arrangement location of the vibrating unit 20. And outputs the change results to the vibration control unit 52. When the change result is input, the vibration control unit 52 generates a vibration output signal according to the changed vibration mode based on the change result, and outputs the vibration output signal to the vibration unit 20 after the change. Output.

The sheet 4 includes a pressure measurement unit 62 in addition to the above-described multiple vibration units 20.
The pressure measurement unit 62 includes the pressure detection device 24 described above, measures the pressure distribution of the sheet surface 18 based on the pressure detected by the pressure detection device 24, and outputs the measurement result to the notification device 6.

  Next, the vibration unit 20 to be vibrated by the vibration changing unit 56 and the change of the vibration mode will be described in more detail.

  As for the change of the vibration unit 20 to be vibrated, the vibration changing unit 56 excludes the vibration unit 20 of the area where the vibration is less likely to be transmitted to the occupant U among the vibration units 20 belonging to the vibration area corresponding to the notification information. Change to Thereby, it is possible to suppress unnecessary vibration of the vibration unit 20 which hardly contributes to transmission of notification information.

  An area where vibration is hardly transmitted to the occupant U (hereinafter referred to as "ineffective area") is specified based on the pressure distribution, and in the present embodiment, in the pressure distribution, an area where the pressure is lower than the first threshold Pth1. And, two areas of the area exceeding the second threshold Pth2 are specified as invalid areas. The first threshold value Pth1 is a pressure that indicates that the body of the occupant U is not in contact with the seat surface 18 or that the contact is not sufficient for transmitting vibration. On the other hand, the second threshold Pth2 is a pressure at which the vibration of the vibrating portion 20 is suppressed by the contact of the body of the occupant U, and the sensation is dulled by the strong contact, so that the vibration is hardly transmitted to the occupant U as a sensation. Specific pressure values of the first threshold Pth1 and the second threshold Pth2 are values appropriately determined by experiments or the like.

  Therefore, the vibration change unit 56 determines only the vibration unit 20 in which the pressure of the pressure distribution is in the range from the first threshold Pth1 to the second threshold Pth2 among the vibration units 20 corresponding to the notification information as the vibration target Change the initial vibration target. As a result of this change, the location at which the body of the occupant U is in contact with the seat surface 18 due to the sitting posture of the occupant U, the position and orientation of each portion of the seat 4, the size difference of the body of the occupant U, etc. Even if the degree of contact is different, only the vibration unit 20 contributing to the transmission of notification information vibrates, so wasteful vibration can be suppressed while achieving reliable transmission.

However, if the pressure exceeds the second threshold Pth2 in the entire vibration area corresponding to the notification information, no vibration unit 20 actually vibrates in the vibration area. In this case, the vibration changing unit 56 arranges the pressure in the range from the first threshold Pth1 to the second threshold Pth2 in the vibrating unit 20 near the original vibrating area (for example, the vibrating area adjacent to the original vibrating area). Vibrate what is being done.
Thereby, the pressure on the vibration area corresponding to the notification information exceeds the second threshold Pth2 and the vibration generated in the vibration area is suppressed, or the body is not in contact with the vibration area. Even if it is present, notification information can be reliably transmitted by vibrating another nearby vibration unit 20 instead.

  With regard to the change of the vibration mode, the vibration changing unit 56 changes the vibration mode generated by the vibration unit 20 to a vibration mode that gives the occupant U a stimulus of appropriate strength.

If it explains in full detail, the vibration mode for notifying crew member U information information is beforehand set up so that the stimulus given to crew member U may become appropriate.
However, even if the vibration is the same, the stronger the body of the occupant U in close contact with the seat surface 18, the stronger the stimulus felt by the occupant U. Depending on the degree of adhesion, the stimulus of vibration is too strong and may surprise the occupant U It is possible to give a feeling of pleasure. On the contrary, if the closeness of the body is weak, the stimulus of the vibration is too weak, and the transmission of the notification information to the occupant U may be inaccurate.
Therefore, the vibration changing unit 56 of the present embodiment maintains the stimulation due to the vibration constant regardless of the degree of adhesion of the occupant U to the seat surface 18 by changing the vibration mode according to the pressure distribution. . Specifically, when the pressure is equal to or higher than the third threshold Pth3 in the pressure distribution, the vibration changing unit 56 changes the vibration mode of the vibrating unit 20 so that the stimulus given to the occupant U is weakened, and vice versa On the other hand, in the case of the fourth threshold value or less, the vibration mode of the vibration unit 20 is changed so that the stimulation becomes stronger. The third threshold Pth3 is a pressure indicating that the stimulus to the occupant U is too strong in the prescribed vibration mode of the vibrating unit 20, and the fourth threshold Pth4 is a stimulus for the occupant U in the prescribed vibration mode of the vibrating unit 20. Is a pressure that is too weak.

  The “prescribed vibration mode” is a vibration mode set in advance for each of the notification information, and the third threshold Pth3 and the fourth threshold Pth4 are set for each of the notification information. For example, when notifying drowsiness information, a stronger stimulus is given to the occupant U than the other notification information, and based on this, the third threshold Pth3 and the fourth threshold Pth4 corresponding to the drowsiness information are also appropriately Adjusted to

  In addition, the vibration changing unit 56 changes the vibration mode to make the stimulation constant by appropriately changing various parameters (amplitude, frequency, phase, vibration waveform (envelope), rhythm of vibration) related to the vibration. Do. For example, the vibration changing unit 56 strengthens the vibration as the pressure is higher, or increases the frequency of the vibration, or changes the rhythm of the vibration according to the level of the pressure to thereby specify the vibration defined for each of the notification information. The stimulus provided by the embodiment is maintained substantially constant regardless of the pressure at the vibration point.

Next, the operation of this embodiment will be described.
FIG. 6 is a flowchart showing the operation of the notification system 1.
When the ACC power supply of the vehicle 2 is turned on, the notification system 1 enters a start start state (system ON) (step S1: Yes). Along with this, the pressure measurement unit 62 of the sheet 4 starts measuring the pressure distribution of the sheet surface 18, and outputs the measurement result of the pressure distribution to the notification device 6 in real time (step S2).

Thereafter, when the notification information output unit 3 generates the notification information and outputs the notification signal by, for example, occurrence of an event to be notified (step S3: Yes), in the notification device 6, the vibration control unit 52 Based on the notification signal, a vibration area associated with the notification information is specified, and the vibration unit 20 included in the vibration area is specified as a vibration target (step S4).
On the other hand, in the notification device 6, the vibration changing unit 56 determines the change between the vibrating unit 20 to be vibrated and the vibration mode based on the pressure distribution of the seat surface 18, and outputs the change result to the vibration control unit 52. (Step S5). Then, based on the change result, the vibration control unit 52 generates a vibration output signal that vibrates the changed vibration unit 20 with the changed vibration, and outputs the vibration output signal to the changed vibration unit 20. (Step S6).
Each of the vibration units 20 vibrates according to the vibration output signal (step S7), and the notification information is notified to the occupant U by this vibration.

  The processes of steps S2 to S7 are repeatedly performed until the output of the notification signal is stopped (step S8: Yes), that is, the notification of the notification information currently notified is not necessary. Thereby, even during notification of the notification information, when the seating posture of the occupant U changes due to the adjustment of each part of the seat 4, the sway of the vehicle 2, etc., the change is detected in step S2, The vibration unit 20 to be vibrated and the vibration mode are changed in real time according to the change of the distribution.

  According to the present embodiment, the following effects can be obtained.

The notification device 6 of the present embodiment controls each vibration of the vibration unit 20 corresponding to the notification information, based on the pressure distribution generated on the seat surface 18 of the seat 4 by the contact of the occupant U who is a seated person.
Thereby, the notification information can be accurately transmitted to the occupant U regardless of the difference in the sitting posture of the occupant U, the size of the body, and the like.

  The notification device 6 of the present embodiment does not vibrate the vibrating unit 20 disposed in the range in which the pressure is lower than the first threshold Pth1 among the vibrating units 20 corresponding to the notification information. The first threshold value Pth1 is a pressure that indicates that the body of the occupant U is not in contact with the seat surface 18 or that the contact is not sufficient for transmission of vibration, which makes it difficult to contribute to transmission of notification information. Wasteful vibration of the vibration unit 20 can be suppressed.

  The notification device 6 of the present embodiment is a vibration unit disposed in a pressure range of the second threshold Pth2 or more, which is a threshold of the pressure at which the vibration of the vibration unit 20 is suppressed, among the vibration units 20 corresponding to the notification information. Do not shake 20. Thereby, waste of the vibrating portion 20 at a portion where the vibration of the vibrating portion 20 is suppressed by contact of the body of the occupant U, and further, at a portion where the sensation is dulled by strong contact and the vibration is hardly transmitted to the occupant U as a sense Vibration can be suppressed.

In the notification device 6 of the present embodiment, when the pressure is not arranged in the range from the first threshold Pth1 to the second threshold Pth2, none of the vibration units 20 corresponding to the notification information is near the vibration area corresponding to the notification information. The other vibration unit 20 is vibrated.
Thereby, the pressure on the vibration area corresponding to the notification information exceeds the second threshold Pth2 and the vibration generated in the vibration area is suppressed, or the body is not in contact with the vibration area. Even if it is present, notification information can be reliably transmitted by vibrating another nearby vibration unit 20 instead.

The notification device 6 of the present embodiment performs the vibration mode of the vibration unit 20 based on the pressure of the portion where the vibration unit 20 is disposed so as to maintain a constant stimulus given to the occupant U by the vibration of the vibration unit 20. change.
Thus, the stimulus given by the vibration can be maintained constant regardless of the degree of adhesion of the occupant U to the seat 4, and notification information can be reliably and appropriately transmitted to the occupant U.

  The embodiment described above is merely an example of the present invention, and any modification and application can be made without departing from the spirit of the present invention.

In the embodiment described above, the pressure distribution of the sheet surface 18 of the sheet 4 is detected by the pressure detection device 24 using a pressure sensor. However, it is not always necessary to use a pressure sensor to identify the pressure distribution.
More specifically, since there is a correlation between the seating posture of the occupant U and the pressure distribution, the pressure distribution can be specified based on the seating posture. Further, since there is a correlation between the position of each part of the seat 4 and the posture and the posture of each part of the body of the occupant U, the sitting posture of the occupant U is based on the position of each part of the seat 4 and the posture. It can be identified.
For example, as shown in FIG. 7, the sitting posture of the occupant U changes according to the inclination of the backrest surface 10A of the seatback 10, and the pressure distribution on the backrest surface 10A and the seating surface 8A also changes. Specifically, as the backrest surface 10A is inclined rearward, the pressure applied to the backrest surface 10A is higher, and at the same time, the pressure tends to be widely dispersed in the seating surface 8A.
In practice, the pressure distribution differs depending on not only the inclination angle of the backrest 10A, but also the height of the seating surface 8A and the positions before and after the adjustment state of each part of the seat 4.

  Therefore, the pressure at which the position of each part of the seat 4 and the adjustment state (movable state) of the posture are acquired from the sheet 4 and the pressure distribution on the sheet surface 18 is specified based on the combination of the respective adjusted states (movable state) By providing the distribution specifying unit in the notification device 6, the pressure distribution can be specified without using a pressure sensor.

  In the embodiment described above, the seat 4 has been described by taking the front seat of the vehicle 2 as an example, but the seat 4 may be a rear seat. In addition to the above-described portions, the seat 4 may be provided with another portion such as an armrest. By applying the present invention to the rear seat, for example, arrival at a planned arrival site can be notified to the occupant U of the rear seat by vibration.

  Further, the seat 4 of the present invention is not limited to the seat of the vehicle 2, and may be a chair such as a home or an office.

The above-mentioned FIG. 3 is a schematic diagram showing the functional configuration of the notification device 6 according to the main processing content in order to make the present invention easy to understand, and the configuration of the notification device 6 corresponds to the processing content. It can also be classified into more components.
Also, one component can be classified to perform more processing.
Also, the processing of each component may be performed by one hardware or may be performed by a plurality of hardware.
In addition, processing of each component may be realized by one program or may be realized by a plurality of programs.

  The processing unit of the flowchart of FIG. 6 is divided according to the main processing content, and the present invention is not limited by the method and name of division of the processing unit.

Reference Signs List 1 alarm system 2 vehicle 3 alarm information output unit 4 seat 6 alarm device 8A seat surface 10A backrest surface 12A front 18 seat surface 20 vibration unit 24 pressure detection device 52 vibration control unit 56 vibration change unit 62 pressure measurement unit U occupant (seated person )

Claims (7)

It is a notification device for transmitting the notification information to the seat occupant by the vibration of the vibration portion corresponding to the notification information among the plurality of vibration portions arranged on the sheet surface of the seat to which the body of the seat contact can contact. ,
A pressure measurement unit that measures the pressure generated on the sheet surface;
A vibration change unit that changes each vibration of the vibration unit corresponding to the notification information based on the pressure distribution measured by the pressure measurement unit;
A notification device comprising: The vibration change unit is
The notification device according to claim 1, wherein among the vibration units corresponding to the notification information, the vibration units arranged in a range in which the pressure is lower than a first threshold value are not vibrated. The vibration change unit is
Among the vibration units corresponding to the notification information, the vibration units arranged in a pressure range equal to or higher than a second threshold which is a threshold value of the pressure at which the vibration of the vibration unit is suppressed are not vibrated.
The notification device according to claim 2, characterized in that: The vibration change unit is
In any of the vibration units corresponding to the notification information, when the pressure is not disposed in the range from the first threshold to the second threshold, another vibration unit near the vibration unit corresponding to the notification information The notification device according to claim 3, characterized in that it vibrates. The vibration change unit is
The vibration mode of the vibrating portion is changed based on the pressure of the portion where the vibrating portion is disposed so as to maintain a constant stimulus given to the seated person by the vibration of the vibrating portion. The notification apparatus in any one of 2-4. The sheet surface of the sheet includes a plurality of movable parts,
The notification device according to any one of claims 1 to 5, further comprising: a pressure distribution specifying unit that specifies a pressure distribution on the sheet surface based on a combination of movable states of the movable parts. The seat surface of the seat to which the seated person's body can come in contact is provided with a sheet in which a plurality of vibration parts are interspersed,
A notification system that vibrates the vibration unit corresponding to notification information among a plurality of vibration units, and transmits the notification information to the seat occupant,
A notification system comprising: a vibration change unit configured to change each vibration of the vibration unit corresponding to the notification information based on a pressure distribution generated on the seat surface by the contact of the seat occupant.

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