JP6945465B2 - Receiver for disaster prevention monitoring system - Google Patents

Description

The present invention relates to a receiver used in a disaster prevention monitoring system (including a fire alarm system) such as a fire receiver that receives a signal from a fire detector, a transmitter, or the like to warn of a fire, and particularly a P-type receiver. Regarding the technology that is effective for the information display section in.

Conventionally, some fire receivers that receive a signal from a fire detector, a transmitter, or the like to warn of a fire are provided with an information display unit that displays detailed contents of an event such as a fire that has occurred. For example, the R-type fire receiver is provided with an information display unit including a relatively large liquid crystal display, and is configured to be able to display detailed information. In some cases, the information display unit is configured as a touch panel type input device.
On the other hand, the P-type fire receiver is often configured to display a code on a 7-segment display capable of displaying simple numbers and symbols even if there is no information display unit. Therefore, there is a problem that the displayed contents are difficult to understand, and the accurate grasp of the situation and the transmission of information to the related departments are delayed.

Conventionally, as an invention relating to information display in a fire alarm system equipped with a detector, for example, there is an invention in which a display device capable of displaying information by a message on a liquid crystal display is provided in a disaster prevention monitoring device (Patent Document). 1).
The display device of the disaster prevention monitoring device described in Patent Document 1 is provided with a switch means for selectively displaying a notification screen, a panel failure screen, and a line failure screen in the vicinity of the display area of the message display, and each screen is provided. A selection indicator lamp and a display unit indicating each screen name are individually provided corresponding to the above, and the selection indicator lamp corresponding to the selected screen is displayed.

Japanese Unexamined Patent Publication No. 08-180279

In the display device in the disaster prevention monitoring device described in Patent Document 1, since a plurality of event display areas and menu display areas are provided in one display unit, the display unit becomes large and the display unit is displayed. Since the unit is configured to be controlled by the main function unit that detects fire, if a new fire occurs while checking the displayed information, the displayed information will change to new event information. Therefore, there is a problem that there is a possibility that the information of the previous event cannot be fully understood.

The present invention has been made in the background as described above, and an object of the present invention is to display detailed information about an event that occurred when an event occurred in a monitored area in an easy-to-understand manner by a simple operation. The purpose is to provide a receiver for a disaster prevention monitoring system that can be used.
Another object of the present invention is to provide a receiver for a disaster prevention monitoring system capable of displaying information on an event that has occurred separately from the main function.
Still another object of the present invention is to provide a receiver for a disaster prevention monitoring system capable of reducing power consumption and promptly notifying that there is information to be displayed when a new event occurs. There is.

In order to solve the above problems, the invention according to the present application is
A main function unit that can detect the occurrence of an event according to a signal from a terminal device installed in the monitoring target area, and an information display function unit that can display information corresponding to the event detected by the main function unit. In a receiver for a disaster prevention monitoring system, which includes an event occurrence notification unit for notifying the occurrence of an event and a housing having an information display unit for displaying information related to the occurrence event on the front surface.
A storage means for storing information related to the event is provided.
The main function unit includes an event generation information output means capable of generating a signal in response to an event that detects the occurrence and outputting the signal to the information display function unit.
The housing provides the information display of a command input / notification means having a notification means capable of notifying the occurrence of an event corresponding to the monitoring target area and an operation means for inputting a command related to display on the information display unit. In preparation for the vicinity of the part
The information display function unit includes information display control means that receives a signal from the operation means as an input and executes and controls information display to the information display unit.
When the information display control means receives the event occurrence information from the main function unit, the notification means is operated, and the information related to the occurrence event is read out from the storage means in response to the operation of the operation means. The information display unit is displayed as a character string, the operation of the notification means is stopped, and the information display by the information display unit is stopped when a predetermined time elapses or the operation means is operated. It is a thing.

According to the above means, when the information display control means receives the event occurrence information from the main function unit, the notification means is operated, so that it is notified that the event has occurred and that there is information related to the occurrence event. Can be done. Further, since the information related to the generated event is displayed as a character string on the information display unit according to the operation of the operating means, it is possible to easily know what the generated event is.
Further, the operation of the notification means is stopped when the information is displayed on the information display unit, and the information display by the information display unit is stopped when a predetermined time elapses or the operation means is operated, so that the power consumption is reduced. At the same time, it is possible to promptly notify that there is information to be displayed when a new event occurs.

Further, according to the receiver having the above configuration, since the information display function unit having the control means separate from the control means of the main function unit is provided, the operation of the main function that performs the original monitoring is different. It can be separated to display information about the event that occurred. Therefore, the information display function unit is not restricted to immediately execute the display when a new event imposed on the main function unit occurs, and continues to display the information of the previously generated event. This makes it possible for the observer to accurately grasp the situation.

Here, preferably, the information display function unit includes a display operation means capable of inputting a command regarding the content displayed on the information display unit, and the display operation means is provided during execution of information display by the information display unit. Detailed information related to the generated event is read out from the storage means and displayed on the information display unit according to the operation.
According to such a configuration, detailed information about the event that has occurred can be grasped by looking at the information displayed on the information display unit.

Further, preferably, the information display control means is configured to erase the memory of the occurrence event from the memory when the information display by the information display unit is stopped.
According to such a configuration, it is possible to prevent the information of the event that has already been displayed from being displayed again due to an erroneous operation of the display operation unit or the like, causing confusion in grasping the situation. In addition, when a new event occurs, it is possible to promptly notify that there is information to be displayed.

Further, preferably, one of the operation modes is a setting mode, and the predetermined time can be set in the setting mode.
According to the receiver having the above configuration, the predetermined time until the display of the information by the information display unit is stopped can be changed according to the system.

Further, preferably, the information display unit is configured by a dot matrix type fluorescent display tube.
According to such a configuration, information can be easily displayed by a character string, and the viewing angle can be increased by using a fluorescent display tube for the information display unit, and it is easy from a distant position or an oblique direction. The displayed contents can be read. Further, even if a fluorescent display tube having a relatively short life is used for the information display unit, the display is stopped (turned off) after a predetermined time has passed since the information was displayed, so that the display can be used for a long period of time. Can continue to do.

Further, preferably, the display operation means is instructed to display an operation button on the information display unit and to change the information displayed on the information display unit. It is configured to include operation buttons.
According to such a configuration, the information can be easily displayed when it is necessary to display the information, and the displayed information can be changed. Therefore, even in the information display unit having a small number of displayed characters, the information is displayed in order. More information can be displayed by displaying.

According to the receiver for the disaster prevention monitoring system of the present invention, detailed information about the event that occurred when the event occurred in the monitored area can be displayed in an easy-to-understand manner by a simple operation. In addition, information about the event that occurred can be displayed separately from the main function. Further, the power consumption can be reduced, and when a new event occurs, it is possible to promptly notify that there is information to be displayed.

It is a front view which shows one Embodiment of the fire receiver as a receiver provided with the information display part which concerns on this invention. It is a block diagram which shows the structural example of the main function part provided in the fire receiver of embodiment. It is a block diagram which shows the structural example of the information display function part provided in the fire receiver of embodiment. It is a flowchart which shows an example of the procedure of the mode change processing in the information display function part in the fire receiver of embodiment. It is a flowchart which shows an example of the control procedure in the operation mode in the information display function part in the fire receiver of embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a front panel of a P-type fire receiver to which the present invention is applied. The fire receiver 10 of FIG. 1 is installed in the disaster prevention center or the central control room of the building, receives a fire signal from a detector or a transmitter installed in the building, and sounds a district acoustic device to cause a fire. The fire receiver 10 has a function of notifying the occurrence of a fire by displaying a lamp or the like provided on the front panel of the fire receiver 10.

As shown in FIG. 1, on the front panel of the fire receiver 10, the main operation unit 11 displays the operating status of the fire receiver such as turning on the AC power, issuing a fire alarm, and inputting a transmitter signal by lighting various lamps. And the area display window 12 for the fire alarm line that displays the line where the fire was reported and the line where the detector line was broken, and the smoke prevention / exhaust system that displays the place where the fire occurred and the place where the smoke prevention terminal etc. was operated. District display window 13 for lines, speaker 14 for notifying the occurrence of fire, etc., acoustic operation unit 15 equipped with a push button for stopping the sound of the receiver and bell (district sound), the operation mode of the receiver and the battery described later. An information display unit 16 consisting of a dot matrix type VFD (fluorescent display tube) that displays information such as the results of a test, a display operation unit 17 having a shift button for changing the display content, and a receiver. The information display unit 16 is provided with an information operation unit 18 having an information button 18a and an information lamp 18b to display and confirm the contents of the fire and the contents of the abnormality.

Although not particularly limited, in this embodiment, the VFD (Vacuum Fluorescent Display Tube) of the information display unit 16 is of a size capable of displaying, for example, a 16-character katakana sentence for two lines. .. A liquid crystal display panel may be used instead of the VFD, but the viewing angle can be increased by using the VFD, and the displayed contents can be easily read from a distant position or an oblique direction. Can be done.
The district display windows 12 and 13 have a plurality of lamps for notifying the occurrence of a fire or the operation of a smoke prevention terminal (smoke exhaust damper, smoke prevention shutter, etc.) for each district line, and the district name corresponding to each lamp. Alternatively, it is composed of a display column (display plate) indicating the installation location in characters.

In the information operation unit 18, the information lamp 18b blinks when there is a factor for notifying the observer (occurrence of an event such as a fire or an abnormality), and when the information button 18a is pressed while the information lamp 18b is blinking, the blinking lights up. The information display unit 16 displays fire information and abnormality information in katakana or the like. Further, a child door 10a that can be opened and closed is provided at the lower part of the front panel of the fire receiver 10, and inside the child door 10a, a battery test switch button 19A that commands the start of the battery test and a command to start the fire test are commanded. An internal operation unit 19 having a fire test switch button 19B for commanding a fire test, a test recovery button 19C for commanding recovery from a test, a fire recovery button 19D for commanding recovery from a fire test, and the like is provided.

The display operation unit 17 has a shift button (Δ) 17A for progressively advancing the display contents, a shift button (▽) 17B for reverse advancing, a “back” button 17C for returning the display mode to the original state, and a display mode. A "decision" button 17D is provided to determine.
Further, although not shown, the control board that drives each display unit (12, 13, 16) and the speaker 14 in response to the command input from the operation unit (11, 17, 18) is the housing of the fire receiver 10. It is installed inside. Further, a backup power supply device that supplies power to the control board and the like in the event of a power failure of the commercial AC power supply and a backup power supply test device for testing the standby power supply device are provided inside the housing of the fire receiver 10.

2 and 3 show configuration examples of the main function unit and the information display control unit provided in the fire receiver.
As shown in FIG. 2, the main function unit 20 includes a control unit 21a including a microcomputer (CPU) and the like provided in the housing of the fire receiver 10, input / output units (I / O) 22a to 22d, and a memory. 23a to 23c are provided, and these blocks are connected via a data bus and an address bus to form a main control board 21.
The memory 23a is a ROM for storing a program, the memory 23b is a RAM for work, and the memory 23c is a memory for storing data related to interlocking settings and the like, and can be configured as an EEPROM or a flash memory.

Further, the main function unit 20 controls the sensor line district circuit 24a and the smoke prevention device, which supply power to terminal devices such as sensors connected to a plurality of district lines and receive and process a warning signal. Smoke prevention circuit 24b that sends a signal and receives and processes a drive response signal from smoke prevention equipment, district acoustic circuit 24c that sounds each district acoustic device or all district acoustic devices, fire signal to other equipment, etc. Serial communication port (serial I / O) 25a that outputs event history information such as fire detection signals stored in the memory 23c to an external personal computer via a communication cable, fire or abnormality It is provided with a serial communication port (serial I / O) 25b or the like that outputs a signal notifying the display control board 31 (see FIG. 3) of the information display function unit that an event such as the above has occurred.

Further, on the main control board 21, the above-mentioned main operation unit 11 (see FIG. 1), a district display window 12 for a fire alarm line displaying a line in which a fire has been reported and a line in which a sensor wire disconnection has occurred, and a fire Stops the area display window 13 for the smoke prevention line that displays the place where the smoke is generated and the place where the smoke prevention terminal is operated, the speaker 14 that notifies the occurrence of a fire, the sound of the receiver and the bell (district sound). An acoustic operation unit 15 provided with a push button for the purpose is connected. The district display windows 12 and 13 are each composed of a plurality of lamps for notifying the occurrence of a fire or the operation of the smoke prevention device for each district (see FIG. 1). Since the configuration and functions of the main function unit 20 may be the same as those of the conventional fire receiver, detailed description thereof will be omitted.

As shown in FIG. 3, the information display function unit 30 in the present embodiment receives event occurrence information from the information display control board 31 provided in the housing of the fire receiver 10 and the main function unit 20. The serial communication port (serial I / O) 34a and the serial communication port 34b for transmitting / receiving data to / from an external personal computer (PC) or the like are provided.
The information display control board 31 of the information display function unit 30 can be configured by a microcomputer (CPU) and a memory such as a ROM or RAM, similarly to the main control board 21.

The information display control board 31 is provided with a setting switch button 19E for giving a command to shift to a mode for performing various settings, and also includes a setting switch button 19E, an information button 18a of the information operation unit 18, and a display operation unit 17. Command signals are input from the shift buttons 17A and 17B, the "back" button 17C, and the "decision" button 17D. The information display control board 31 is configured to perform display drive control of the information display unit 16 and lighting drive control of the information lamp 18b in response to signals from these input means. Specifically, the information display control board 31 normally suspends the display of the information display unit 16, blinks the information lamp 18b when receiving a signal from the main function unit 20, and blinks the information lamp 18b while the information lamp 18b is blinking. When the information button 18a is pressed, the blinking is changed to lit, and the information display unit 16 displays fire information and abnormality information.

Further, the information display control board 31 has a remaining time until the next 10-minute discharge test can be performed during the 10-minute discharge test by the backup power supply test device provided in the housing of the fire receiver 10. It is configured to have a function of displaying the required charging time-elapsed time) on the information display unit 16. In the 10-minute discharge test, the battery test switch button 19A provided in the internal operation unit 19 (see FIG. 1) in the housing and the decision switch button 17D provided in the front panel are simultaneously pressed (on operation). It starts by. In this way, the information display unit 16 can be used not only for displaying information when an event such as a fire or abnormality occurs, but also for displaying the elapsed time during various tests, the voltage measured during the test, and the like. It is configured.

FIG. 4 shows a flowchart of an example of a mode change processing procedure set by operating the setting switch button 19E provided in the fire receiver and the buttons 17A to 17D of the display operation unit 17. The fire receiver 10 in the present embodiment first enters the initialization mode when the power is turned on. Further, the timer 33 starts the timekeeping operation when the power is turned on.

As shown in FIG. 4, in the mode change process, first, the data (initial value) in the internal memory is read in step S1, and then it is determined whether or not a predetermined time (for example, 30 seconds) has elapsed (step S2). Then, when the predetermined time (30 seconds) elapses, the transition from the initialization mode to the normal operation mode is performed.

During the operation mode shifted from step S2, if it is determined that the setting switch button 19E has been pressed and held (for example, 3 seconds) (Yes) except when a fire is triggered, the setting can be made at the site as in step S3. Transition to the setting mode (site).
In this setting mode, various settings can be performed by operating any of the operation buttons 17A to 17D provided on the information display unit 16 and the display operation unit 17.

Next, the procedure of the display control of the information display unit 16 and the lighting control of the information lamp 18b of the information operation unit 18 executed by the information display control board 31 in the operation mode will be described with reference to the flowchart of FIG.
When the operation mode is started, the information display control board 31 first determines whether or not event occurrence information has been input from the main control board 21 of the main function unit 20 (step S11). Here, if it is determined that the event occurrence information has been input (Yes), the process proceeds to step S12, and information related to the event that has occurred (text data indicating the type and content of the fire or abnormality) is stored from the memory (EEPROM) 23c. Read. Subsequently, the information lamp 18b of the information operation unit 18 is blinked (step S13).

Next, the process proceeds to step S14, and it is determined whether or not the information button 18a has been pressed, and if it is determined that the information button 18a has not been pressed (No), the process returns to step S11. If it is determined in step S14 that the information button 18a has been pressed (Yes), the process proceeds to step S15, the information lamp 18b is changed from blinking to lit, and the first text is displayed on the information display unit 16.

After that, the process proceeds to step S16, and after resetting the timer to start the timekeeping operation, it is determined whether or not a preset predetermined time (for example, 5 seconds) has elapsed (step S17). Then, if it is determined that the predetermined time (5 seconds) has not elapsed (No), the process proceeds to step S18, it is determined whether or not the information button 18a has been pressed, and the information button 18a has not been pressed (No). If it is determined, the process proceeds to step S20, and it is determined whether or not the "decision" button 17D (or the "back" button 17C) has been pressed.

Then, in step S20, if it is determined that the "OK" button 17D (or "Back" button 17C) has been pressed (Yes), the process proceeds to step S21 to proceed to the first sentence (or one before) of the detailed text. Displayed text) is displayed on the information display unit 16 and the process proceeds to step S22. Further, if it is determined in step S20 that the "OK" button 17D has not been pressed (No), the process proceeds to step S22. In step S22, it is determined whether or not the shift button 17A or 17B has been pressed.
Here, if it is determined that the shift button 17A or 17B is pressed (Yes), the process proceeds to step S23 to display the next text sentence (or one previous text sentence) on the information display unit 16, and then step S16. Return to, reset the timer, start it, and repeat the above process.

On the other hand, when it is determined in step S17 that a predetermined time (for example, 5 seconds) has elapsed (Yes), or when it is determined in step S18 that the information button 18a is pressed while the information lamp 18b is lit (Yes). In step S19, the information lamp 18b is turned off and the display of the information display unit 16 is stopped. As a result, control is performed so that the display of the information display unit 16 disappears when a predetermined time (5 seconds) has elapsed since the last button operation. Then, after stopping the blinking of the information lamp 18b and the display of the information display unit 16 in step S19, the process returns to step S11 and waits for the occurrence signal of the next event.
Further, in step S19, the display is stopped, and the event occurrence information related to the event that has been displayed up to that point is erased from the memory on the information display control board 31. As a result, it is possible to prevent the information (read information) of the event that has already been displayed due to an erroneous operation of the display operation unit 17 from being redisplayed and causing confusion in grasping the situation. In addition, by displaying the information, it is possible to notice that a new event has occurred.

As described above, in this embodiment, when an event occurs, the information lamp 18b blinks, and when the information button 18a is operated while the event occurs, information related to the event (fire, abnormality type, etc.) is a character string. Since it is displayed as, the observer can easily recognize what kind of event has occurred. Further, if the "OK" button 17D is operated during the display, detailed information on the event that has occurred is displayed, so that the observer can grasp the details of the event that has occurred.
Further, the information display is started by the operation of the information button 18a, and even if the next event occurs during the information display, the information lamp 18b is not blinked, and a predetermined time (for example, 5 seconds) has elapsed after the operation is completed. At that point, the display of the information display unit 16 disappears, and the display can be performed when the next event occurs. Therefore, there is no possibility that the display is interrupted during the confirmation of the content of the event.

As described above, in the fire receiver of this embodiment, since the information display control board 31 that does not configure the main function is provided separately from the main control board 21 of the main function unit 20, a new event (a new event during information display) Even if a fire) occurs, it is not necessary to immediately display the information on the information display unit 16, and the display indicated immediately before can be continued. Then, when a new event occurs after the information display is completed, the information lamp 18b blinks, and unconfirmed event information can be displayed by operating the display operation unit 17. If the next event (fire) occurs during the information display of the information display unit 16, the main control board 21 immediately causes the district display windows 12 and 13 to display the event (fire) to notify the occurrence of the event (fire). ..

Moreover, in the fire receiver of this embodiment, as described above, the information display control board 31 only receives the signal from the main control board 21 of the main function unit 20, and the information display control board 31 moves to the main control board 21. It does not have a function to send a signal, that is, it has a configuration that can be operated for information display separately from the alarm of the main function, so it has special authority such as disaster prevention manager, manufacturer's specialist, fire equipment engineer, etc. Even if an event occurs in which the receiver panel can be operated or the inside of the panel cannot be opened to take corrective action without it, a person who does not have the authority or knowledge can operate the information operation unit 17 to display information. It is possible to easily confirm the content of the event that has occurred by displaying the information of the event that has occurred in the unit 16, and to give a detailed explanation and report to the above-mentioned special authority beneficiary.

Further, the fire receiver 10 of the present embodiment uses the memory 23c of the main control board 21 of the main function unit 20 as time-series history information up to a predetermined number (for example, 1000) of data related to the events generated during the operation mode. Has the function of accumulating in. If the number exceeds a predetermined number, old data will be overwritten. Then, the accumulated history information can be read out by connecting a mobile terminal such as a personal computer to the serial communication port 25a of the main control board 21 via a communication cable. Further, the serial communication port 25a can be used to write a program executed by the control unit 21a on the main control board 21 to the memory 23c. As described above, since the serial communication port 25a for reading the history information is provided as a port separate from the serial communication port 25b for supplying the event occurrence information to the information display function unit 30, the main function unit 20 and the main function unit 20 and the serial communication port 25a are provided. History information can be read from the control board 31 without stopping the original operation of the information display function unit 30.

Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the history information of the event that has occurred in the memory of the main function unit 20 is accumulated and the history information can be read out. Data related to event occurrence information supplied in time series from the board 21 is transmitted to the information display function unit 30, stored as history information in the memory of the information display control board 31, and shifted to a predetermined mode (for example, inspection mode). It may be configured so that the history information can be read by doing so.

Further, in the above-described embodiment, the information button 18a and the information lamp 18b are arranged side by side, but the information button 18a may be composed of a semi-transparent member to provide the information lamp 18b inside the information button 18a. good.
Further, in the above description, the case where the present invention is applied to a P-type fire receiver has been described as an example, but the present invention is not limited to the P-type fire receiver, and an R-type fire receiver and other monitoring systems can be configured. It can be applied to various receivers. Further, although there is a sub-receiver as a display device for grasping the fire situation at a place other than the monitoring base where the fire receiver is installed, the present invention can be applied to the sub-receiver.

10 Fire receiver (monitoring device)
11 Main operation unit 12 District display window for fire alarm line 13 District display window for smoke-proof line 14 Speaker 15 Sound operation unit 16 Information display unit (display device)
17 Display operation unit 18 Information operation unit 18a Information button (operation button)
18b Information lamp (information notification lamp)
19 Internal operation unit 19E Setting switch button (operation button)
20 Main function unit 21 Main control board 30 Information display function unit 31 Information display control board

Claims (6)

A main function unit that can detect the occurrence of an event according to a signal from a terminal device installed in the monitoring target area, and an information display function unit that can display information corresponding to the event detected by the main function unit. A receiver for a disaster prevention monitoring system, comprising a housing having an event occurrence notification unit for notifying the occurrence of an event and an information display unit for displaying information related to the occurrence event on the front surface.
A storage means for storing information related to the event is provided.
The main function unit includes an event generation information output means capable of generating a signal in response to an event that detects the occurrence and outputting the signal to the information display function unit.
The housing provides the information display of a command input / notification means having a notification means capable of notifying the occurrence of an event corresponding to the monitoring target area and an operation means for inputting a command related to display on the information display unit. In preparation for the vicinity of the part
The information display function unit includes information display control means that receives a signal from the operation means as an input and executes and controls information display to the information display unit.
When the information display control means receives the event occurrence information from the main function unit, the notification means is operated, and the information related to the occurrence event is read out from the storage means in response to the operation of the operation means. It is configured to display as a character string on the information display unit, stop the operation of the notification means, and stop the information display by the information display unit when a predetermined time elapses or the operation means is operated. A receiver for a disaster prevention monitoring system that is characterized by being The information display function unit includes display operation means capable of inputting commands related to the contents displayed on the information display unit, and responds to the operation of the display operation means during execution of information display by the information display unit. The receiver for a disaster prevention monitoring system according to claim 1, wherein detailed information related to the occurrence event is read out from the storage means and displayed on the information display unit. The display operation means includes an operation button for instructing the information display unit to display information, and an operation button for instructing the information displayed on the information display unit to be changed. The receiver for a disaster prevention monitoring system according to claim 2, wherein the receiver is characterized by the above. The method according to any one of claims 1 to 3, wherein the information display control means is configured to erase the memory of the generated event from the memory when the information display by the information display unit is stopped. Receiver for disaster prevention monitoring system. The receiver for a disaster prevention monitoring system according to any one of claims 1 to 4 , wherein one of the operation modes is a setting mode, and the predetermined time can be set in the setting mode. The receiver for a disaster prevention monitoring system according to any one of claims 1 to 5 , wherein the information display unit is a dot matrix type fluorescent display tube.

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