Patent Application
20200118434
The present disclosure relates to an information processor and a vehicle system configured to notify a vehicle driver of information.
A technology is known by which, at an intersection, when a vehicle should stop for a stop signal of a traffic light but is traveling at a predetermined speed or higher, the display of a traffic light on an intersecting road, which intersects the road on which the vehicle is travelling, is changed, so that a person in a vehicle traveling on the intersecting road is notified of the vehicle ignoring the stop signal to enter the intersection (see JP-A-2009-151701, for example).
With the abovementioned technology, however, an accident prevention system needs to be installed for each intersection at which the existence of a dangerous vehicle needs to be announced. Accordingly, it is not realistic to announce the existence of a dangerous vehicle at an arbitrary intersection.
The embodiments address the above-described issue, and a general purpose thereof is to provide an information processor and a vehicle system capable of performing, at an arbitrary intersection, notification of accurate caution information at the time of passing through the intersection.
To resolve the issue above, an information processor of one embodiment includes: a first acquirer configured to acquire, when a first vehicle is traveling on a first road toward an intersection and a second vehicle is traveling on a second road, which intersects the first road, toward the intersection, a traveling tendency of the first vehicle from a first storage unit storing the traveling tendency at an intersection of each of a plurality of vehicles; a second acquirer configured to acquire, when the first vehicle is traveling on the first road toward the intersection and the second vehicle is traveling on the second road toward the intersection, riskiness of the intersection from a second storage unit storing the riskiness of each of a plurality of intersections; a judgment unit configured to judge whether or not there is caution information at the time of passing through the intersection, based on the traveling tendency of the first vehicle acquired by the first acquirer and the riskiness of the intersection acquired by the second acquirer; and a notification unit configured to notify, when the judgment unit has judged that there is caution information at the time of passing through the intersection, the second vehicle of the caution information at the time of passing through the intersection, before the second vehicle enters the intersection.
According to the embodiment, when the first vehicle is traveling on the first road toward the intersection and the second vehicle is traveling on the second road toward the intersection, the traveling tendency of the first vehicle is acquired from the first storage unit, and the riskiness of the intersection is acquired from the second storage unit. Based on the traveling tendency of the first vehicle and the riskiness of the intersection, whether or not there is caution information at the time of passing through the intersection is judged, and, when it is judged that there is caution information at the time of passing through the intersection, the second vehicle is notified of the caution information at the time of passing through the intersection. Therefore, accurate caution information at the time of passing through the intersection can be conveyed at an arbitrary intersection.
The information processor may further include: a third acquirer configured to acquire vehicle information at the time of entering an intersection of each of a plurality of vehicles; a first deriver configured to derive the traveling tendency at an intersection of each vehicle based on the vehicle information of each of a plurality of vehicles acquired by the third acquirer and to store the traveling tendency thus derived in the first storage unit; and a second deriver configured to derive the riskiness of each intersection based on the vehicle information of each of a plurality of vehicles acquired by the third acquirer and to store the riskiness thus derived in the second storage unit.
The judgment unit may judge the riskiness at the time of entering the intersection, as the caution information at the time of passing through the intersection.
When the traveling tendency of the first vehicle indicates a tendency to contravene the traffic regulations, the judgment unit may judge the riskiness at the time of entering the intersection to be higher, and, when the riskiness of the intersection is higher, the judgment unit may also judge the riskiness at the time of entering the intersection to be higher.
The first road may be a road with a stop instruction, and the second road may be a priority road.
Another embodiment relates to a vehicle system. The vehicle system includes: a first storage unit storing a traveling tendency at an intersection of each of a plurality of vehicles; a second storage unit storing riskiness of each of a plurality of intersections; a first acquirer configured to acquire, when a first vehicle is traveling on a first road toward an intersection and a second vehicle is traveling on a second road, which intersects the first road, toward the intersection, the traveling tendency of the first vehicle from the first storage unit; a second acquirer configured to acquire, when the first vehicle is traveling on the first road toward the intersection and the second vehicle is traveling on the second road toward the intersection, the riskiness of the intersection from the second storage unit; a judgment unit configured to judge whether or not there is caution information at the time of passing through the intersection, based on the traveling tendency of the first vehicle acquired by the first acquirer and the riskiness of the intersection acquired by the second acquirer; and a notification unit configured to notify, when the judgment unit has judged that there is caution information at the time of passing through the intersection, the second vehicle of the caution information at the time of passing through the intersection, before the second vehicle enters the intersection.
Embodiments will now be described, by way of example only, with reference to the accompanying drawings that are meant to be exemplary, not limiting, and wherein like elements are numbered alike in several figures, in which:
Various embodiments now will be described. The embodiments are illustrative and are not intended to be limiting.
Each vehicle-mounted device 10 is mounted on a vehicle 14, which is an automobile. Each vehicle-mounted device 10 performs wireless communication with the server device 12. The wireless communication standard is not particularly limited, and may be 3G (third-generation mobile communication system), 4G (fourth-generation mobile communication system), or 5G (fifth-generation mobile communication system), for example. Each vehicle-mounted device 10 may perform wireless communication with the server device 12 via a base station, which is not illustrated. The server device 12 may be installed in a data center, for example, and functions as an information processor for processing big data transmitted from the multiple vehicle-mounted devices 10.
The communication unit 22 performs wireless communication with the server device 12. The communication unit 22 regularly transmits, to the server device 12, vehicle information acquired by the vehicle information acquirer 20. To the vehicle information, information for identifying the vehicle 14 as the transmission source is attached. The frequency of transmitting the vehicle information can be appropriately determined through experiments or the likes, and may be the same as the frequency at which the vehicle information acquirer 20 acquires the vehicle information, for example.
When caution information at the time of passing through an intersection is transmitted from the server device 12 to the subject vehicle, the communication unit 22 receives the caution information at the time of passing through the intersection. The output unit 24 then provides, to the driver, the caution information at the time of passing through the intersection thus received by the communication unit 22. The communication unit 22 and the output unit 24 will be detailed later.
The communication unit 30 performs wireless communication with the communication unit 22 of each of the multiple vehicle-mounted devices 10. The communication unit 30 receives vehicle information of multiple vehicles 14 from the communication units 22 of the multiple vehicle-mounted devices 10. The vehicle information includes vehicle information at the time of entering an intersection. The communication unit 30 outputs the vehicle information of the multiple vehicles 14 to the third acquirer 32.
The third acquirer 32 acquires the vehicle information of the multiple vehicles 14 received by the communication unit 30. The third acquirer 32 then outputs the vehicle information of the multiple vehicles 14 to the vehicle information storage unit 34. Accordingly, the vehicle information storage unit 34 stores the vehicle information of the multiple vehicles 14 acquired by the third acquirer 32.
Based on the vehicle information of the multiple vehicles 14 stored in the vehicle information storage unit 34, the first deriver 36 regularly derives the traveling tendency at an intersection of each vehicle 14 and stores the traveling tendency thus derived in the first storage unit 40. Namely, the traveling tendency at an intersection is specific to each vehicle 14 and is regularly updated. The frequency of deriving the traveling tendency at an intersection can be appropriately determined through experiments or the likes. The first storage unit 40 stores the traveling tendency at an intersection of each of the multiple vehicles 14.
The traveling tendency at an intersection of each vehicle 14 indicates whether or not the driver of the vehicle 14 tends to contravene the traffic regulations at an intersection. More specifically, the traveling tendency at an intersection of each vehicle 14 indicates whether the driver tends not to stop or tends to stop late at an intersection with a stop instruction. The stop instruction includes a red signal, a stop sign, and a stop line, for example. The position of the stop instruction can be identified based on map data stored in a storage unit, which is not illustrated.
The traveling tendency at an intersection of each vehicle 14 can be expressed as a numerical value, for example. In the following, an example will be described in which, when the numerical value indicating the traveling tendency at an intersection of a vehicle 14 is larger, the driver of the vehicle 14 is more likely to contravene the traffic regulations at an intersection, and is more likely not to stop or more likely to stop late at a stop instruction. As the ratio of the number of times a vehicle 14 has not stopped or has stopped late at a stop instruction to the number of times the vehicle 14 has passed through an intersection becomes larger, the numerical value indicating the traveling tendency at an intersection of the vehicle 14 also becomes larger.
When a vehicle 14 travels on a road with a stop instruction and when the speed of the vehicle 14 passing through an intersection is a first threshold or higher, the first deriver 36 judges that the vehicle 14 has not stopped at the stop instruction, so as to increase the numerical value indicating the traveling tendency at an intersection of the vehicle 14. When the speed of the vehicle 14 passing through the intersection is less than the first threshold, the first deriver 36 judges that the vehicle 14 has stopped at the stop instruction.
When a vehicle 14 travels on a road with a stop instruction and when the degree of deceleration of the vehicle 14 entering an intersection is a second threshold or greater and, in addition, the brake operation amount of the vehicle 14 entering the intersection is a third threshold or greater, the first deriver 36 judges that the vehicle 14 has stopped late at the stop instruction, so as to increase the numerical value indicating the traveling tendency at an intersection of the vehicle 14. When the degree of deceleration is less than the second threshold or when the brake operation amount is less than the third threshold, the first deriver 36 judges that the vehicle 14 has appropriately stopped at the stop instruction. The optimum value of each of the first threshold, second threshold, and third threshold can be appropriately determined through experiments or the likes.
The first deriver 36 may set the amount by which the numerical value indicating the traveling tendency at an intersection is increased when it is judged that the vehicle 14 has not stopped, to be greater than the amount by which the numerical value indicating the traveling tendency at an intersection is increased when it is judged that the vehicle 14 has stopped late.
Based on the vehicle information of the multiple vehicles 14 stored in the vehicle information storage unit 34, the second deriver 38 regularly derives the riskiness of each intersection and stores the riskiness thus derived in the second storage unit 42. Namely, the riskiness is specific to each intersection and is regularly updated. The second storage unit 42 stores the riskiness of each of multiple intersections.
The riskiness of each intersection may be expressed as a numerical value, for example, and is the sum of first riskiness and second riskiness. The first riskiness indicates how many vehicles 14 have not stopped or have stopped late at a stop instruction at the intersection. For example, if drivers cannot visually recognize a stop instruction easily at an intersection, the first riskiness of the intersection will be higher.
When a vehicle 14 travels on a road with a stop instruction and when the speed of the vehicle 14 passing through an intersection is the first threshold or higher, the second deriver 38 judges that the vehicle 14 has not stopped at the stop instruction, so as to increase the first riskiness of the intersection. When the speed of the vehicle 14 passing through the intersection is less than the first threshold, the second deriver 38 judges that the vehicle 14 has stopped at the stop instruction.
When a vehicle 14 travels on a road with a stop instruction and when the degree of deceleration of the vehicle 14 entering an intersection is the second threshold or greater and, in addition, the brake operation amount of the vehicle 14 entering the intersection is the third threshold or greater, the second deriver 38 judges that the vehicle 14 has stopped late at the stop instruction, so as to increase the first riskiness of the intersection. When the degree of deceleration is less than the second threshold or when the brake operation amount is less than the third threshold, the second deriver 38 judges that the vehicle 14 has appropriately stopped at the stop instruction.
The second deriver 38 may set the amount by which the first riskiness is increased when it is judged that the vehicle 14 has not stopped, to be greater than the amount by which the first riskiness is increased when it is judged that the vehicle 14 has stopped late.
The second riskiness indicates the poorness of visibility at the intersection, and, if the visibility from one road toward another road is poor at an intersection because of an obstacle, such as a building and a wall, located near the intersection, the second riskiness of the intersection will be higher. The second riskiness is a fixed value preset for each intersection and is stored in the second storage unit 42 in advance. The second riskiness may be updated with some frequency, such as once a year. Also, the second riskiness needs not necessarily be used.
The multiple intersection monitoring units 44 respectively monitor predetermined intersections. Each of the multiple intersection monitoring units 44 has the same functions except monitoring a different intersection. In the following, an intersection monitoring unit 44 monitoring an intersection 100 shown in
The intersection monitoring unit 44 comprises a traveling vehicle identifier 50, a first acquirer 52, a second acquirer 54, a judgment unit 56, and a notification unit 58. The traveling vehicle identifier 50 acquires, from the vehicle information storage unit 34, current position information and current bearing information of each vehicle present near the predetermined intersection 100. The vehicle information thus acquired includes information of a first vehicle 14a and a second vehicle 14b traveling toward the intersection 100, and may also include information of a vehicle that has passed through the intersection 100. Based on map data and the acquired current position and traveling direction of each vehicle present near the predetermined intersection 100, the traveling vehicle identifier 50 identifies the first vehicle 14a traveling on the first road R1 with a stop instruction toward the intersection 100, and the second vehicle 14b traveling on the second road R2 as a priority road toward the intersection 100. The traveling vehicle identifier 50 then notifies the first acquirer 52 and the second acquirer 54 of the identification of the first vehicle 14a and the second vehicle 14b. In this example, the vehicle-mounted device 10 is mounted on each of the first vehicle 14a and the second vehicle 14b.
When the first vehicle 14a is traveling on the first road R1 toward the intersection 100 and the second vehicle 14b is traveling on the second road R2 toward the intersection 100, the first acquirer 52 acquires the traveling tendency of the first vehicle 14a from the first storage unit 40. The first acquirer 52 then outputs the traveling tendency of the first vehicle 14a to the judgment unit 56.
When the first vehicle 14a is traveling on the first road R1 toward the intersection 100 and the second vehicle 14b is traveling on the second road R2 toward the intersection 100, the second acquirer 54 acquires the riskiness of the intersection 100 from the second storage unit 42. The second acquirer 54 then outputs the riskiness of the intersection 100 to the judgment unit 56.
Based on the traveling tendency of the first vehicle 14a acquired by the first acquirer 52 and the riskiness of the intersection 100 acquired by the second acquirer 54, the judgment unit 56 judges whether or not there is caution information at the time of passing through the intersection.
For example, the judgment unit 56 may judge whether or not there is caution information at the time of passing through the intersection, based on an evaluation value calculated by substituting the numerical value indicating the traveling tendency of the first vehicle 14a and the riskiness of the intersection 100 into a predetermined calculation formula. The predetermined calculation formula may be a calculation formula for calculating as the evaluation value the sum of the numerical value indicating the traveling tendency of the first vehicle 14a and the riskiness of the intersection 100, a calculation formula for calculating as the evaluation value the product of the numerical value indicating the traveling tendency of the first vehicle 14a and the riskiness of the intersection 100, or another calculation formula. When the evaluation value is a judgment threshold or greater, the judgment unit 56 judges that there is caution information at the time of passing through the intersection, and, when the evaluation value is less than the judgment threshold, the judgment unit 56 judges that there is no caution information at the time of passing through the intersection. The optimum value of the judgment threshold can be appropriately determined through experiments or the likes.
The judgment unit 56 may retain a table containing correspondence relationships between the traveling tendency of the first vehicle 14a, the riskiness of the intersection 100, and whether or not there is caution information, and may refer to the table to judge whether or not there is caution information at the time of passing through the intersection.
The judgment unit 56 may judge the riskiness at the time of entering the intersection, as the caution information at the time of passing through the intersection. In this case, the judgment unit 56 may use the aforementioned evaluation value, as the riskiness at the time of entering the intersection. Namely, when the traveling tendency of the first vehicle 14a indicates a tendency to contravene the traffic regulations, the judgment unit 56 judges the riskiness at the time of entering the intersection to be higher, and, when the riskiness of the intersection 100 is higher, the judgment unit 56 also judges the riskiness at the time of entering the intersection to be higher.
For example, when the numerical value indicating the traveling tendency of the first vehicle 14a is large and the first vehicle 14a is highly likely to contravene the traffic regulations at an intersection, the judgment unit 56 judges the riskiness at the time of entering the intersection to be high, even if the riskiness of the intersection 100 is low. Also, when the riskiness of the intersection 100 is high, the judgment unit 56 judges the riskiness at the time of entering the intersection to be high, even if the numerical value indicating the traveling tendency of the first vehicle 14a is small and the first vehicle 14a is less likely to contravene the traffic regulations at an intersection.
The judgment unit 56 outputs the judgment result to the notification unit 58. When the judgment unit 56 has judged that there is caution information at the time of passing through the intersection, the notification unit 58 notifies, via the communication unit 30, the second vehicle 14b of the caution information at the time of passing through the intersection, before the second vehicle 14b enters the intersection 100. More specifically, the notification unit 58 outputs the caution information at the time of passing through the intersection to the communication unit 30. The communication unit 30 then transmits the caution information at the time of passing through the intersection to the second vehicle 14b. To the caution information at the time of passing through the intersection, information for identifying the second vehicle 14b as the transmission destination is attached.
Referring back to
When the vehicle-mounted device 10 is not mounted on the first vehicle 14a, the traveling vehicle identifier 50 is unable to identify the first vehicle 14a, and the first acquirer 52 is unable to acquire the traveling tendency of the first vehicle 14a. Even in this case, the judgment unit 56 judges whether or not there is caution information at the time of passing through the intersection, based on the riskiness of the intersection 100 acquired by the second acquirer 54. When the riskiness of the intersection 100 is higher, the judgment unit 56 judges that there is caution information at the time of passing through the intersection.
The configuration described above may be implemented by a CPU or memory of any given computer, an LSI, or the like in terms of hardware, and by a memory-loaded program or the like in terms of software. In the present embodiment is shown a functional block configuration realized by cooperation thereof. Therefore, it would be understood by those skilled in the art that these functional blocks may be implemented in a variety of forms by hardware only, software only, or a combination thereof.
There will now be described the overall operation performed by the vehicle system 1 having the configuration set forth above.
According to the present embodiment, in the server device 12, the first storage unit 40 stores the traveling tendency at an intersection of each of multiple vehicles 14, and the second storage unit 42 stores the riskiness of each of multiple intersections. When the first vehicle 14a is traveling on the first road R1 toward the intersection 100 and the second vehicle 14b is traveling on the second road R2 toward the intersection 100, the traveling tendency of the first vehicle 14a is acquired from the first storage unit 40, and the riskiness of the intersection 100 is acquired from the second storage unit 42. Based on the traveling tendency of the first vehicle 14a and the riskiness of the intersection 100, whether or not there is caution information at the time of passing through the intersection is judged, and, when there is, the second vehicle 14b is notified of the caution information at the time of passing through the intersection. Therefore, at an arbitrary intersection, accurate caution information at the time of passing through the intersection can be conveyed in consideration of the features of the first vehicle 14a and the intersection.
Also, since the server device 12 collects vehicle information of multiple vehicles 14 and derives the traveling tendency at an intersection of each vehicle 14 and the riskiness of each intersection based on the vehicle information, the driver can be notified of accurate caution information at the time of passing through the intersection based on the vehicle information of the multiple vehicles 14.
Also, since the riskiness at the time of entering the intersection is judged, the driver can find how much attention to pay. Further, since the riskiness at the time of entering the intersection is judged to be higher when the traveling tendency of the first vehicle 14a indicates a tendency to contravene the traffic regulations, and the riskiness at the time of entering the intersection is also judged to be higher when the riskiness of the intersection 100 is higher, the riskiness at the time of entering the intersection can be appropriately judged.
The second embodiment differs from the first embodiment in that part of the processing in the server device 12 is performed by the vehicle-mounted device 10. In the following, description will be given mainly for the differences from the first embodiment.
The second embodiment will also be described with reference to the situation of the intersection 100 shown in
The communication unit 30 of the server device 12 receives the information of the intersection 100 transmitted from the vehicle-mounted device 10. The communication unit 30 then outputs the information of the intersection 100 to the control unit 72. Based on the information of the intersection 100 received by the communication unit 30, the control unit 72 acquires the current position information and the current bearing information of each vehicle present near the intersection 100 and outputs the current position information and current bearing information to the communication unit 30. The control unit 72 also acquires from the first storage unit 40 the traveling tendency of each vehicle present near the intersection 100 and outputs the traveling tendency to the communication unit 30. The control unit 72 also acquires from the second storage unit 42 the riskiness of the intersection 100 and outputs the riskiness to the communication unit 30. Accordingly, the communication unit 30 transmits, to the vehicle-mounted device 10 of the second vehicle 14b, the current position information, current bearing information, and traveling tendency of each vehicle present near the intersection 100, and the riskiness of the intersection 100, output by the control unit 72.
In the vehicle-mounted device 10 on the second vehicle 14b, the communication unit 22 receives the information as described above transmitted from the server device 12. Accordingly, the identifier 70 identifies the first vehicle 14a traveling on the first road R1 toward the intersection 100, based on the current position and the traveling direction of each vehicle present near the intersection 100 received by the communication unit 22.
When the first vehicle 14a is traveling on the first road R1 toward the intersection 100 and the second vehicle 14b is traveling on the second road R2 toward the intersection 100, the first acquirer 52 acquires the traveling tendency of the first vehicle 14a received by the communication unit 22. This process corresponds to the process by which the first acquirer 52 acquires the traveling tendency of the first vehicle 14a from the first storage unit 40 of the server device 12.
When the first vehicle 14a is traveling on the first road R1 toward the intersection 100 and the second vehicle 14b is traveling on the second road R2 toward the intersection 100, the second acquirer 54 acquires the riskiness of the intersection 100 received by the communication unit 22. This process corresponds to the process by which the second acquirer 54 acquires the riskiness of the intersection 100 from the second storage unit 42 of the server device 12.
The operation of the judgment unit 56 is the same as described in the first embodiment. When the judgment unit 56 has judged that there is caution information at the time of passing through the intersection, the notification unit 58 notifies the second vehicle 14b, or more specifically the driver of the second vehicle 14b, of the caution information at the time of passing through the intersection, before the second vehicle 14b enters the intersection 100. The notification unit 58 may be configured as a display unit that displays the caution information at the time of passing through the intersection in the form of text and images, as a speaker or the like that outputs the caution information at the time of passing through the intersection in the form of sound, or as a combination thereof.
According to the present embodiment, the effects of the first embodiment can be obtained and, in addition, the flexibility in the configuration of the vehicle system 1 can be improved.
Described above is an explanation based on exemplary embodiments. The embodiments are intended to be illustrative only, and it will be obvious to those skilled in the art that various modifications to a combination of constituting elements or processes could be developed and that such modifications also fall within the scope of the present disclosure.
For example, the judgment unit 56 may also judge whether or not there is a possibility of collision between the first vehicle 14a and the second vehicle 14b, based on the position and speed of the first vehicle 14a and the position and speed of the second vehicle 14b. For the judgment of the possibility of collision, well-known technologies can be employed. When the judgment unit 56 has judged that there is a possibility of collision and has also judged that there is caution information at the time of passing through the intersection, the notification unit 58 notifies the second vehicle 14b of the caution information at the time of passing through the intersection, before the second vehicle 14b enters the intersection 100. When the judgment unit 56 has judged that there is no possibility of collision, even though the judgment unit 56 has judged that there is caution information at the time of passing through the intersection, the notification unit 58 does not notify the second vehicle 14b of the caution information at the time of passing through the intersection. In this modification, since the notification of caution information is not performed when there is no possibility of collision between the first vehicle 14a and the second vehicle 14b, the caution information can be conveyed more appropriately in consideration of the traveling conditions of the first vehicle 14a and the second vehicle 14b.
The judgment unit 56 may also judge whether or not there is a possibility that the first vehicle 14a will stop at a stop instruction, based on the position, speed, brake operation information, and the likes of the first vehicle 14a. For example, when the first vehicle 14a is traveling before a stop instruction at a predetermined speed or less, with which a vehicle can stop at the stop instruction, and the first vehicle 14a also performs brake operation, the judgment unit 56 may judge that there is a possibility that the first vehicle 14a will stop. On the other hand, when the first vehicle 14a is traveling before the stop instruction at a speed higher than the predetermined speed, with which a vehicle cannot stop at the stop instruction, or when the first vehicle 14a does not perform brake operation before the stop instruction, the judgment unit 56 may judge that there is no possibility that the first vehicle 14a will stop. Accordingly, when the judgment unit 56 has judged that there is no possibility that the first vehicle 14a will stop, and the judgment unit 56 has also judged that there is caution information at the time of passing through the intersection, the notification unit 58 notifies the second vehicle 14b of the caution information at the time of passing through the intersection, before the second vehicle 14b enters the intersection 100. On the other hand, when the judgment unit 56 has judged that there is a possibility that the first vehicle 14a will stop, even though the judgment unit 56 has judged that there is caution information at the time of passing through the intersection, the notification unit 58 does not notify the second vehicle 14b of the caution information at the time of passing through the intersection. In this modification, the notification of caution information is not performed when there is a possibility that the first vehicle 14a will stop, even though the traveling tendency of the first vehicle 14a indicates a tendency to contravene the traffic regulations or even though the riskiness of the intersection 100 is high, so that the caution information can be conveyed more appropriately in consideration of the traveling conditions of the first vehicle 14a.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2017-198648 | Oct 2017 | JP | national |
This is a continuation application of U.S. patent application Ser. No. 16/156,475, filed Oct. 10, 2018 which claims priority to the disclosure of Japanese Patent Application No. 2017-198648 filed on Oct. 12, 2017, the entire contents of which all are incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16156475 | Oct 2018 | US |
| Child | 16714694 | US |
