JP4664018B2 - Wireless time information transmission system - Google Patents

Description

  The present invention generally relates to a time information transmission system that performs time correction wirelessly. More specifically, the present invention performs time adjustment of a second wireless device, such as a slave clock, in a relay manner, even if the radio range of a first wireless device, for example, a parent clock, that corrects the time is limited. It is related with the time information transmission system which can be.

  The first wireless device transmits the reference time information wirelessly, such as radio waves, and the second wireless device arranged around the first wireless device receives it and sets the time based on the reference time information of the first wireless device. There is known a wireless time information transmission system that is modified to match the time of a first wireless device. The reference time of the first wireless device is generated by receiving radio waves from an external standard time information source. Since this wireless time information transmission system does not require a wire for transmitting time information, a plurality of second wireless devices that display the time that coincides with the time of the first wireless device can be relatively freely located within the site. Or it is suitable for arranging on the premises.

  However, in this wireless time information transmission system, if the first wireless device uses a relatively large output radio wave to transmit the reference time information, it is subject to legal restrictions and requires procedures such as a license. . In addition, the transmission device of the first wireless device also requires a large-scale device.

  For this reason, it is conceivable that the reference time information is transmitted from the first wireless device to the second wireless device using a weakly output radio wave with lenient or no legal restrictions. However, in this case, the effective radio wave coverage of the first wireless device is limited. Therefore, the arrangement range of the second radio apparatus that can be covered by one first radio apparatus is limited, and there is a problem that the second radio apparatus cannot be arranged so far away from the first radio apparatus. .

  In addition, since the first radio apparatus transmits the reference radio wave with a weak radio wave, whether or not the second radio apparatus receives the radio wave of the reference time information from the first radio apparatus and corrects the time. It is preferable to actually confirm. This is because even if the second wireless device is arranged relatively close to the first wireless device, the weak radio wave is easily affected by interference from other radio waves and obstacles. This is because the time of the reference time information from the first wireless device may not be correctly received and the time cannot be corrected. Therefore, in order to ensure the reliability of the time information transmission system, the first wireless device and the second wireless device can communicate wirelessly in both directions, and the first wireless device always allows the second wireless device to communicate. A system that monitors the state of the second wireless device by polling is conceivable. However, when a large number of second wireless devices are polled and monitored by one first wireless device, the receiving devices of all the second wireless devices need to be constantly operated in order to receive polling. There is a problem that the power consumption of the second wireless device increases.

  Therefore, the present invention solves the above-mentioned problems of the prior art, and even if the first radio apparatus can output only comparatively weak radio waves, the second radio apparatus can be arranged relatively widely and freely. In addition, it is possible to confirm whether or not the second wireless device is receiving time information, and the second wireless device can perform simple and power-saving for a large number of second wireless devices, and the second thereof. An object of the present invention is to provide a wireless device.

  To achieve the above purpose. The present invention is a time information transmission system including a plurality of second wireless devices that receive time information wirelessly from a first wireless device and adjust the time, wherein the slave clock receives the time information. Correction means for correcting its own time based on the received time information, and transmission means for wirelessly transmitting time information for correcting the time of another child clock based on the corrected own time And a rank control means for providing rank information to the transmission means for transmitting the rank information for distinguishing from the received time information to the transmitted time information, and providing a wireless time information transmission system. To do.

  In the configuration of the wireless time information transmission system of the present invention, even if the wireless output of the first wireless device that transmits the reference time information for time correction is weak and the reachable range is limited, the time information of the first wireless device is limited. The time correction can be performed in a relay manner from the slave clock that has received the signal to another slave clock. Therefore, the time can be corrected even if the second wireless device is arranged at a position where the time information cannot be received directly from the first wireless device.

  According to another embodiment of the present invention, in the above configuration, the second wireless device further transmits the individual identification information for identifying itself to the transmitted time information. There is provided a wireless time information transmission system characterized by having an individual identification information control means for giving to a transmission means.

  According to this configuration, since the plurality of second wireless devices can be individually identified, the second wireless devices can be individually managed in the time information transmission system.

  Furthermore, according to another embodiment of the present invention, in the second configuration, the transmission means is configured to perform another second wireless communication according to the rank information from the rank control means and the individual identification information from the individual identification information control means. A wireless time information transmission system is provided that transmits time information at a predetermined time so as not to overlap with the apparatus.

  According to this configuration, it is possible to avoid congestion and interference even when a plurality of second wireless devices transmit using the same transmission frequency.

  Furthermore, according to another embodiment of the present invention, in the first configuration, the receiving means has means for stopping reception of the time information for a predetermined time after receiving the time information successfully. A wireless time information transmission system is provided.

  According to this configuration, once the second wireless device has successfully received the time information, the reception of the time information transmitted by the other second wireless device is prevented thereafter, and repeated time adjustment and transmission are avoided. can do. Further, the power consumption of the receiving means can be saved.

  Further, according to another embodiment of the present invention, in the first configuration, the second radio apparatus receives the time information of the receiver, rank information associated with the received time information, and the received time information There is provided a wireless time information transmission system comprising means for displaying reception information including the individual identification information of the transmission source accompanying the time information.

  According to this configuration, the reception confirmation of the time information of the second radio apparatus and the propagation path thereof can be grasped, and thereby the arrangement or relocation of the first radio apparatus or the second radio apparatus can be facilitated.

  Furthermore, according to another embodiment of the present invention, in the second configuration, the transmitting means may determine whether or not the receiver can receive time information, rank information associated with the received time information, and received time information. A wireless time information transmission system is provided that transmits reception information including the individual identification information of a transmission source to a first wireless device.

  According to this configuration, the reception confirmation of the time information of the second wireless device and the propagation path of the time information can be grasped by the first wireless device.

  Furthermore, according to another embodiment of the present invention, in the sixth configuration, the second radio apparatus relays transmission of received information from another second radio apparatus to the first radio apparatus. A wireless time information transmission system is provided.

  According to this configuration, since each second wireless device relays the reception information of the other second wireless device to the first wireless device, the first wireless device outside the wireless output reachable range of the second wireless device. The received information can be transmitted to the wireless device.

  Furthermore, according to another embodiment of the present invention, in the seventh configuration, the first radio apparatus includes means for receiving reception information from each second radio apparatus, and each second radio apparatus. There is provided a wireless time information transmission system having display means for displaying received information.

  According to this configuration, the first wireless device can grasp the reception state of the time information of the plurality of second wireless devices, and can centrally manage the plurality of second wireless devices.

  Furthermore, according to another embodiment of the present invention, in the first configuration, bidirectional wireless communication is performed between the first wireless device and the second wireless device, or between the second wireless devices. There is provided a wireless time information transmission system further including a repeater for relaying.

  According to this configuration, when the second wireless device is placed outside the reachable range of the radio wave, the first radio device is provided with a repeater that relays the radio wave so that the radio wave reaches the second radio device. The time information can be received from the other wireless device or the time can be adjusted, or the transmission of the received information from the second wireless device to the first wireless device can be relayed. The degree of freedom of arrangement can be increased.

  Further, according to another aspect of the present invention, in the second wireless device for the time information transmission system that receives the time information wirelessly from the first wireless device and corrects the time, the second wireless device Receiving means for receiving information, correcting means for correcting its own time based on the received time information, and time for correcting the time of the other second radio apparatus based on the corrected own time There is provided a second wireless device characterized by having a transmitting means for transmitting information wirelessly.

According to this configuration, since the second wireless device transmits the time information in a relay manner, even if the first wireless device has a weak wireless output, the second wireless device is wirelessly output from the first wireless device. Can be placed outside the reach of
In addition, the first wireless device, each second wireless device, and a repeater are provided with a display unit for displaying received information, and the above transmission operation and reception operation can be started by manual operation of a predetermined operation switch. Then, when the wireless time information transmission system is installed, the installation work can be performed while confirming the reception state at a desired time, and the work efficiency is improved.

According to the wireless time information transmission system of the present invention, since the sub timepiece is configured to relay radio waves in a relay manner, a wide range can be covered with the radio wave intensity of a weak output radio device or a specific low power radio device. . In addition, there is a child clock at each stage of time information transmission from the first wireless device to the second wireless device, and the first wireless device of the lower second wireless device while correcting its own time Therefore, the delay of time information as seen in simple signal relay does not occur. When the second wireless device receives the time information, it corrects its own time and transmits the time information for time correction for the lower second wireless device, but the time zone for transmission is changed to the other second wireless device. Therefore, even if the same transmission frequency is used in the entire wireless time information transmission system, the transmission signal does not cause congestion or interference, and the signal information transmission means can be freely selected. Wide degree. Since it is possible to display whether or not the time information can be received and the rank of the received time information on each second wireless device, it is possible to easily install or move the clock. Since the parent clock can grasp and manage the reception of the time information signal for time correction of each second wireless device and the information of the transmission system of the time information, the system reliability is high.
In addition, the first wireless device, each second wireless device, and the repeater are provided with a display unit for displaying received information, and the above transmission operation and reception operation can be started by operating the operation switch manually. For example, when the wireless time information transmission system is installed, the work can be performed while confirming the reception state at a desired time, and the work efficiency is improved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an outline of a wireless parent-child clock system 1 as an example of a wireless time information transmission system according to an embodiment of the present invention. The wireless parent-child clock system 1 includes a parent clock 2 as an example of the first wireless device, a plurality of first child clocks 3A, a plurality of second child clocks 3B, and a third wireless device as examples of the second wireless device. A child clock 3C, and repeaters 41 and 42 arranged between one of the plurality of second child clocks 3B and the third child clock 3C are provided.

  Between the master clock 2 and the first slave clock 3A, between the first slave clock 3A and the second slave clock 3B, between the one second slave clock 3B and the repeater 41, and between the repeater 41 and the relay The units 42 and between the repeater 42 and the third sub-clock 3C are connected so as to be capable of bidirectional communication with radio waves having a predetermined output and a predetermined frequency. The output and frequency are selected to be values that do not require a license or permission under legal regulations. The radio waves may have the same frequency.

  The master clock 2 has the configuration shown in the block diagram of FIG. That is, the master clock 2 receives an external standard time information radio wave (broadcast time signal or radio wave JJY) by the antenna 20 and the receiver 21, and matches the standard time by the time correction means 23 via the decoder 22. Correction information for correction is created and sent to the timing means 24. The time measuring means 24 corrects its own time so that it matches the standard time, and corrects the time display of the time display means 25. Further, the time measuring means 24 sends reference time information for correcting the time of the slave clock to the encoder 26 by transmitting to the slave clock. The encoder 26 receives data for identifying information from the master clock 2 from the identification number control means 27, attaches it to the reference time information, and sends it to the transmitter 28. The transmitter 28 transmits data identifying the reference time information and the information from the parent clock via the antenna 20 toward the child clock with a predetermined frequency and an output carrier wave.

  As will be described later, the master clock 2 receives radio waves conveying received information from each slave clock by the antenna 20 and the receiver 21, and the decoder 22 identifies the information from each slave clock and is received by the display means 22A. The reception information of each slave clock is displayed.

  The radio wave transmitted by the master clock 2 and the radio wave described later transmitted by each slave clock may have the same frequency. However, as will be described later, transmission is performed by shifting the time so that the transmission times of the master clock 2 and the slave clock do not match, thereby avoiding interference. Instead of this, interference may be avoided by setting the radio wave transmitted by the parent clock 2 and the radio wave transmitted by each child clock to different frequencies.

  The time measuring means 24 controls the power supply control means 29 to supply power to the transmitter 28 or the receiver 21 only during the transmission time of the predetermined reference time information or the reception time of the predetermined standard time information and the radio wave from the slave clock. To save power consumption.

  The first child clock 3A, the second child clock 3B, and the third child clock 3C have the same configuration shown in FIG. Each child clock 3A, 3B, 3C can communicate with the parent clock 2 and other child clocks bidirectionally by the antenna 30, the receiver 31, and the transmitter 38.

  As shown in FIG. 1, the first child clock 3A is a child clock capable of two-way communication with the parent clock 2 directly by radio waves. The second child clock 3B cannot communicate directly with the parent clock 2 via radio waves, but is a child clock capable of bidirectional communication with one first child clock 3A via radio waves. The third child clock 3C cannot directly communicate with the master clock 2 and the first child clock 3A by radio waves, but can communicate with the second child clock 3B by radio waves. It is.

  Referring to FIG. 3 again, the configuration of the slave clock will be described by taking the first slave clock 3A as an example. The slave clock 3A receives the reference time information from the master clock 2 by the antenna 30 and the receiver 31, and sends it to the time correction means 33 via the decoder 32. The decoder 32 decodes the information indicating that it has been sent from the parent clock 2, displays on the display means 32A that the reference time information has been successfully received from the parent clock 2, and further via the rank control means 37A. The power supply from the power control means 39 to the receiver 31 is stopped, and reception is stopped for a predetermined time.

  The time correction means 33 creates correction information for correcting its own time based on the reference time information from the parent clock 2 and corrects the time of the time measuring means 34 to match the time of the parent clock 2. Then, the time measuring means 34 corrects the time display of the time display 35 and sends first reference time information for correcting the time of the second sub-clock 3B to the encoder 36. The first reference time information is transmitted at a predetermined transmission time of the first sub clock 3A described later. The first reference time information is time information corresponding to a predetermined transmission time of the first child clock 3A, and is different from the reference time information from the parent clock 2.

The encoder 36 adds data for distinguishing from the reference time information of the parent clock to the first reference time information. When the slave clock 3A receives the reference time information from the master clock 2 by the receiver 31, the decoder 32 sends information indicating that the master clock 2 is sent from the master clock 2 to the rank control means 37A. Based on the information from the decoder 32, the rank control unit 37A sends data indicating that the time information to be transmitted is the first reference time information to the encoder 36. The individual identification number control means 37 gives the encoder 36 data for identifying the child clock 3A from other child clocks in the parent-child clock system. The encoder 36 indicates, in the first reference time information from the time measuring means 34, data indicating the first reference time information from the rank control means 37A and a specific child clock from the individual identification number control means 37. The data is added and sent to the transmitter 38.

  The transmitter 38 transmits information from the encoder 36 to another child clock via the antenna 30 at a predetermined time. This predetermined time is determined as will be described later, so that it does not overlap with the transmission time of the parent clock 2 and other child clocks 3A, 3B, and 3C using the same transmission frequency, thereby avoiding interference. . The transmission time of each child clock is the rank of the child clock, that is, the first child clock 3A that directly receives the reference time information from the parent clock 2, and the first reference time information from the first child clock. The second child clock 3B and the third child clock 3C receiving the second reference time information from the second child clock are sequentially shifted so as to be delayed. Furthermore, since a plurality of sub-clocks can exist even at the same rank, each sub-clock is transmitted at a transmission time that is further subdivided according to the individual identification number of the sub-clock.

  The power supply control means 39 obtains its own rank from the rank control means 37A, obtains its own individual identification number from the individual identification number control control means 37, knows that the predetermined time has been reached from the time measuring means 34, and transmits the transmitter. Power is supplied to 38 and transmission is performed.

  Further, the power supply control means 39 starts supplying power to the receiver 31 at a predetermined transmission time of the reference time information from the parent clock 2 and the child clock higher than its own rank, and receives the reference time information. Then, the supply of power to the receiver 31 is stopped after reception. Here, since the first slave clock 3A has the highest rank, the receiver 31 is operated during the transmission time of the master clock 2. As a result, power consumption for reception can be saved. In addition to this, the reception of the first or second reference time information transmitted by another child clock is prevented, thereby preventing repeated correction of the time and transmission of the reference time information again.

  In addition, the child clock 3A sends received information including information indicating its own individual identification number, whether reference time information can be received, and information received from the parent clock to the parent clock 2 at a predetermined time. Send. As will be described later, the predetermined time is a time zone different from the time information transmission time, and a different time is assigned to each rank and each individual identification number. When the power supply control means 38 knows that the predetermined time has come from the time counting means 34, the individual identification number control means 37, and the rank control means 37A, it receives the information of its own individual identification number and the reference time information. Power is supplied to the transmitter 38 in order to transmit to the master clock 2 reception information including information indicating whether it has been received and received from the master clock.

  Further, the child clock 3A has a lower rank child clock, that is, whether the second child clock 3B and the third child clock 3C receive their own individual identification number information, time information, and reception time information. When the reception information including the transmission source information is sent to the master clock 2, radio waves are relayed. For this reason, the child clock 3A supplies power to the receiver 31 and the transmitter 38 during the time period when the child clock of the lower rank transmits the reception information to the parent clock, and receives the radio wave from the child clock of the lower rank. Relay to watch 2.

The second sub-clock 3B has the same configuration as the first sub-clock 3A and performs a similar operation. The second sub clock 3B analyzes the fact that the first reference time information from the first sub clock 3A has been received by the decoder 32 and notifies the rank control means 37A. The rank control means 37A identifies that it is the rank of the second child clock, sends the data indicating that the time information transmitted by itself is the second reference time information to the encoder 36, and further adds the second In order to perform reception and transmission at the reception time and transmission time assigned to the child clock, the power supply control means 39 is used to instruct the time for supplying power to the receiver 31 and the transmitter 39. The receiver 31 stops receiving for a certain period of time after receiving the first reference time information, and prevents receiving time information transmitted by other child clocks. Further, the decoder 32 displays on the display means 32A a display indicating that the identification number of the child clock that is the transmission source of the received time information and the first reference time information have been received.
In the above description of the operation, the second child clock 3B has been described as being in a state where it cannot receive the reference time information transmitted from the parent clock 2, but when the reference time information can be received, It operates in the same manner as the child clock 3A, and the time information transmitted by itself is used as the first reference time information.

  The time correction means 33 corrects the time of its own clock means 34 based on the first reference time information, and corrects the time display of the time display means 35. Then, the second reference time information to be used for time correction by the third child clock 3C of the next rank is sent to the encoder 36. The encoder 36 adds the specific individual identification number of the child clock 3B from the individual identification number control means 37 to the time information and information indicating the second reference time information, and sends the information to the transmitter 38. The second reference time information transmitted by the second child clock 3B is time information at a transmission time determined by the rank of the second child clock 3B and the individual identification number as will be described later.

The third sub-clock 3C has the same configuration as the first and second sub-clocks 3A and 3B, and performs a similar operation. What should be noted here is that the third sub clock 3C is in a position where it cannot receive radio waves directly from the second sub clock 3B, and therefore between the second sub clock 3B and the third sub clock 3C. In addition, in the case of FIG. 1, a necessary number of radio wave repeaters, for example, two radio wave repeaters 41 and a radio wave repeater 42 are interposed to perform bidirectional radio wave communication.
The radio wave repeaters 41 and 42 do not have a time display unit, have the same configuration as the child clocks 3A, 3B, and 3C, and have individual identification numbers of the child clocks. The radio wave repeaters 41 and 42 are ranks of the third and fourth child clocks, respectively.
Further, the repeaters 41 and 42 use the same display means as the slave clocks to determine whether radio waves can be received, the rank of the received radio waves, that is, the reference time information, the first or second reference time information, and The transmission source can be displayed and used when the repeaters 41 and 42 are installed. In addition, it is good also as what consists of a receiving / transmission means for a simple radio wave repeater as a repeater.

  The third sub clock 3C analyzes the fact that the fourth reference time information from the radio wave repeater 42 has been received by the decoder 32 and notifies the rank control means 37A. The rank control means 37A identifies that it is the rank of the fifth sub-clock, and when it sends time information, sends information indicating that it is fifth reference time information to the encoder 36. Further, the power supply control means instructs to supply power to the receiver 31 and the transmitter 39 at the reception time and transmission time assigned to the fifth sub-clock. Further, the decoder 32 displays on the display means 32A the identification number of the relay 42 that is the transmission source of the received fourth reference time information and that the fourth reference time information has been received.

  FIG. 1 shows the first child clock 3A to the third child clock 3C. However, a fourth, fifth, or more child clocks are further arranged, and bidirectional communication is performed by radio waves in a relay manner. It can also be connected as possible.

  Each of the child clocks 3A, 3B, 3C has a unique individual identification number in the individual identification number control means 37, but the others have the same configuration, and the rank control means 37A receives basic time information from the parent clock 2 The first child clock 3A receives the first reference time information from the first child clock 3A, the second child clock 3B receives the first reference time information from the first child clock 3A, or the second reference time information from the second child clock 3B. In the case of reception, the third child clock 3C is automatically ranked. As a result, the sub-clocks can be exchanged and can be easily moved.

  Next, with reference to FIG. 4, time allocation at the time of downlink in which time information for time correction is transmitted between the parent clock and the child clock will be described. The downlink is performed, for example, once a day using 1 hour at 2 o'clock. However, the time required for each child clock to receive and transmit time information is the allocated time, 1 second in this example. In addition, once the timepiece for adjusting the time is received, the child timepiece can prevent unnecessary power consumption because the receiver is turned off as described above. Subsequent reception of time information is not performed after the reception by the receiver is stopped, so that repeated time correction and transmission can be prevented. Each child clock gives priority to time information that is higher in rank, that is, closer to the parent clock, among time information such as receivable reference time information, first reference time information, and second reference time information. It is configured to receive.

  As shown in FIG. 4, one minute from 2 o'clock to 2:01 is the transmission time zone of the time information of the first child clock 3A having rank 1, that is, the first reference time information. This one-minute time zone is further subdivided into 60 time zones at 1-second intervals, and assigned in correspondence with the individual identification number of the first child clock 3A (specific number between 1 and 60). Transmission is performed in 1 second of the specified time zone. One minute from 2:01 to 2: 2 is the transmission time zone of the time information of the second sub clock 3B having rank 2, that is, the second reference time information. This one-minute time zone is further subdivided into 60 time zones at intervals of one second, and assigned in correspondence with the individual identification number of the second sub-clock 3B (a specific number between 1 and 60). Transmission is performed in 1 second of the specified time zone. The same applies when there are child clocks of the following ranks. In this way, even if radio waves having the same frequency are used, there is no interference.

  Next, with reference to FIG. 5, the time allocation of the uplink for transmitting the reception information indicating the reception status of each slave clock from the first or third slave clock 3A, 3B, 3C to the master clock 2 by radio waves will be described. To do. The reception information of each child clock includes the individual identification number of the child clock, the availability of reception of time information for time correction, the rank of the received time information (that is, reference time information, first and second reference time information, etc. And the individual identification number of the transmission source of the received time information. Uplink is performed, for example, once a day using 1 hour at 3 o'clock. However, the time required for each sub-clock to transmit information is the allocated time, 1 second in this example. Therefore, useless power consumption can be prevented. The reception operation is started in each slave clock at the start of the uplink, and the reception operation is stopped from the slave clock for which the transmission operation is completed. In this way, information on the reception status of each slave clock is collected in the master clock, the operation status of the entire system is confirmed, and if necessary, the arrangement of repeaters or the position of the slave clock can be changed.

  As shown in FIG. 5, uplink transmission is started from a lower child clock in reverse to the downlink case. That is, one minute from 3 o'clock to 3 o'clock is the transmission time zone of the reception information of the rank 60 slave clock. This 1-minute time zone is further subdivided into 60 time zones at 1-second intervals, and 1 second of the time zone assigned for each child clock individual identification number (specify a specific number between 1 and 60). Send to. The radio wave transmitted by the slave clock is sequentially relayed by the host slave clock and sent to the master clock 2.

One minute from 3:55 to 3:56 is a transmission time zone of the reception information of the third sub clock 3C which is ranked 5. This 1 minute time zone is further subdivided into 60 time zones at 1 second intervals as described above, and the child clock 3C transmits in 1 second of the time zone assigned corresponding to its own individual identification number. . The child clock 3C includes its own individual identification number, whether or not the time information can be received, the rank of the time information (that is, the fourth reference time information), and the individual identification number of the transmitter 42 of the transmission source. Send received information. The reception information of the third slave clock 3C is added to the reception information transmitted at the transmission timings of the relay 42, the relay 41, the second slave clock 3B, and the first slave clock 3A. These are relayed by these and received by the master clock 2.
One minute from 3:56 to 3:57 is the transmission time zone of the reception information of the repeater 42 which is rank 4. This 1 minute time zone is further subdivided into 60 time zones at 1 second intervals as described above, and the repeater 42 performs transmission in 1 second of the time zone assigned corresponding to its own individual identification number. .
One minute from 3:57 to 3:58 is a transmission time zone of the reception information of the repeater 41 of rank 3. This 1 minute time zone is further subdivided into 60 time zones at 1 second intervals as described above, and the repeater 41 transmits in 1 second of the time zone assigned corresponding to its own individual identification number. .

  One minute from 3:58 to 3:59 is a transmission time zone of the reception information of the second sub clock 3B having rank 2. This 1-minute time zone is further subdivided into 60 time zones at 1-second intervals as described above, and the child clock 3B corresponds to its own individual identification number (a specific number between 1 and 60). The transmission is performed in one second of the assigned time zone. The transmission radio wave of the second slave clock 3B is relayed to the first slave clock 3A and delivered to the master clock 2.

  The first child clock 3A, which is the first rank, transmits the reception information directly to the parent clock 2 during the allotted 1 second of 1 minute from 3:59 to 4 o'clock. In this way, even if radio waves having the same frequency are used, there is no interference.

The master clock 2 receives the reception information from all the sub-clocks 3A, 3B, 3C at 4 o'clock and displays the reception information on the display means 22A. Depending on the displayed reception status, it is possible to confirm whether each slave clock has actually received the time information and corrected the time and the propagation path. If necessary, a repeater can be placed or the slave clock can be moved. As a result, the reliability of the parent-child clock system can be improved.
Moreover, the transmission operation and the reception operation of the master clock 2, each slave clock 3A, 3B, 3C and the repeaters 41 and 42 at the time of downlink or uplink as described above can be started by manual operation with an operation switch. Then, when the parent / child clock system is installed, the installation work can be performed while confirming the reception state at a desired time, and the work efficiency is improved.

1 is a schematic view of a parent-child clock system according to an embodiment of the present invention. 1 is a block diagram of a parent clock of a parent-child clock system according to an embodiment of the present invention. The block diagram of the child clock of the parent-child clock system by embodiment of this invention. The time chart which shows the time allocation at the time of the downlink of the time information for the time correction of the parent-child clock system by embodiment of this invention. The time chart which shows the time allocation at the time of the uplink of the reception information of the child clock of the parent-child clock system by embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Parent child clock system 2 Parent clock 3A, 3B, 3C Child clock 31 Receiver 33 Time correction means 37A Rank control means 38 Transmitter

Claims (14)

A plurality of second wireless devices that receive time information wirelessly from the first wireless device and correct the time, and the time information is transmitted from the first wireless device to the second wireless device of the first rank; The time information is sequentially relayed from the second wireless device of the first rank to the second wireless device of the second rank in a relay manner. A time information transmission system,
The second radio apparatus includes a receiving unit that receives time information, a correcting unit that corrects its own time based on the received time information, and another second unit based on the corrected own time . The wireless device transmits the time information for correcting the time of the wireless device and the received time information, and indicates the rank of the first wireless device from the first wireless device. Rank control means for giving the rank information to the transmission means to transmit the rank information to the transmitted time information, and individual identification information for identifying itself is attached to the transmitted time information and transmitted. Therefore , there is provided an individual identification information control means for giving individual identification information to the transmission means . The transmission means follows the time information according to the rank information from the rank control means and the individual identification information from the individual identification information control means at a predetermined time so as not to overlap with another second radio apparatus. The wireless time information transmission system according to claim 1 , wherein: 3. The wireless time information transmission according to claim 1, wherein the reception means has means for stopping reception of time information for a predetermined time after succeeding reception of time information. system. The second radio apparatus includes reception information including whether the receiver can receive time information, rank information associated with the received time information, and the individual identification information of the transmission source associated with the received time information. wireless time information transmission system according to claim 2 or 3 having means for displaying. The transmission means receives reception information including whether or not the receiver can receive the time information, rank information associated with the received time information, and the individual identification information that is the transmission source of the received time information. The wireless time information transmission system according to any one of claims 2 to 4 , wherein the wireless time information transmission system transmits to a wireless device. 6. The wireless time information transmission system according to claim 5 , wherein the second wireless device relays transmission of the reception information from another second wireless device to the first wireless device. The first wireless device includes receiving means for receiving the reception information from the second wireless devices and display means for displaying the reception information of the second wireless devices. Item 7. A wireless time information transmission system according to item 6 . Between said first wireless device and the second wireless device, or between the second wireless device, according to claim 1 to 7, further comprising a repeater for relaying bidirectional wireless communication The wireless time information transmission system according to any one of the above. The wireless time information transmission system according to claim 8 , wherein the repeater is the second wireless device that does not have a time display unit that displays its own time . The repeater includes display means for displaying whether or not the receiver can receive the time information, rank information associated with the received time information, and the individual identification information of the transmission source associated with the received time information. Item 10. A wireless time information transmission system according to Item 9 . 5. The wireless time information transmission system according to claim 4 , wherein the second wireless device is capable of performing the transmission operation and the reception operation in response to a manual operation of a predetermined operation switch. The wireless time information transmission system according to claim 7 , wherein the first wireless device is operable in response to a manual operation of a predetermined operation switch for each of the transmission operation and the reception operation. The wireless time information transmission system according to claim 10 , wherein the repeater is operable to perform the relay operation in response to a manual operation of a predetermined operation switch. A plurality of second wireless devices that receive time information wirelessly from the first wireless device and correct the time, and the time information is received from the first wireless device in the first rank; Relay type to the device meter, from the second wireless device of the first rank to the second wireless device of the second rank, and the time information sequentially to the second wireless device of the lower rank in the second radio device for time information transfer system for transferring a,
The second radio apparatus includes a receiving unit that receives time information, a correcting unit that corrects its own time based on the received time information, and another second unit based on the corrected own time. The transmission means for wirelessly transmitting time information for correcting the time of the wireless device is distinguished from the received time information, and the rank of the own time information from the first wireless device is ranked The rank control means for giving the rank information to the transmission means to transmit the rank information indicating the time information to be transmitted, and the individual identification information for identifying itself is attached to the time information to be transmitted. A second wireless device comprising individual identification information control means for giving individual identification information to the transmission means for transmission .

Images