JPH10148694A - Information communication system in plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the work efficiency while lessening burden on workers by performing two-way commutations between the work filed and control room of a plant. SOLUTION: A monitor cameral 1 and a wireless telephone switching station 2 are arranged in the work field 14 of a nuclear power plant or the like, and each worker carriers a portable information terminal 10 having telephone function and image I/O function. A system controller 4 comprising a display and a data base server is arranged in a control room 15 and connected with the field side through data transfer units 3a, 3b. Commutation is made between the control room 15 and the work site 14 through the portable information terminal 10 using voice, image or test data. The system is also provided with a function for providing a guide on the portable information terminal 10 at the time of moving in the field, and an emergency function for instructing the work or guiding evacuation. An amplification type MOS sensor is employed in the monitor camera 1 and the portable information terminal 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-plant information communication system that enables two-way communication between a worker at a work site in a plant and an operator in a control room.

[0002]

2. Description of the Related Art Conventionally, facilities for handling radioactive materials, such as nuclear power plants, are divided into a radiation control area and a peripheral protection area based on the radiation dose equivalent, and the radiation control area is further divided into several sections.

[0003] Within the radiation control area, the annual dose equivalent limit of radiation workers is specified, and restrictions on entry and the like are determined in consideration of the dose equivalent rate and work time of each worker.

[0004] On the other hand, in order to add, update, or temporarily install equipment in the radiation management area, or to control equipment from outside the radiation management area, installation work of a dedicated cable is required each time. However, as described above, it is difficult to carry out such a large-scale construction due to restrictions on work in the radiation control area. Therefore, especially in an area under a high radiation dose, a monitoring television camera is usually installed as a means for avoiding radiation exposure of the worker during operation, instead of a wired communication means such as a telephone. The television camera monitors the situation at the site and the work status of the workers in the control room.

[0005]

For example, when performing an operation of installing an apparatus in a work place having such a high radiation dose, a communication means between the work place and the outside cannot be secured. It is necessary to enter the work place from outside and operate the device. At this time, when entering and exiting the radiation control area, wear a special work clothes and carry a radiation meter to prevent radioactive contamination of workers,
In addition, it is necessary to perform preparations such as registration of entry into the area, and there is a problem that the work process is lengthened with the accumulation of the time required for the work, resulting in poor work efficiency.

Also, in the field work in a power plant, there is a limit to the items brought into the work site for the purpose of reducing waste in case of contamination due to the radiation control area. ing. Therefore, in such a site work, it is difficult to access information such as a work procedure and a moving position of a work place, so that much time is required for confirming the information. When trouble occurs at the work site,
Since the necessary goods and documents were not on site, there was a lack of information, and it was necessary to temporarily suspend work for troubleshooting.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is an in-plant information which enables a user to smoothly check necessary information while monitoring and controlling the on-site equipment while checking the status of the on-site video. A communication system is provided.

[0008] The present invention also provides an in-plant information communication system that facilitates communication between a work site and a control room by introducing portable equipment without large-scale construction such as installation of a dedicated cable in a radiation control area. I do.

[0009]

In order to achieve the above object, according to the present invention, a work site imaging device and a radio telephone relay station installed at a work site in a plant, and wireless communication with the radio telephone relay station are performed. A portable information terminal having a wireless telephone unit, a first display means for displaying an image and an image input unit for capturing an image of a work site, a second display means provided in a control room for displaying information and storing the information System controller having information management means for performing the operation, a telephone control means provided in the control room and connected to the telephone, a work site imaging device connected to the telephone and the system controller on the control room side, a radio telephone relay station, and a work site And an information transfer device connected on the side of the plant. With this configuration, the information on the control room side and the information on the work site side can be transferred to each other.

Further, according to the present invention, an information transfer device transfers information based on video and audio of a work site to a control room side, and at least one of an image, a voice, and a text stored in information control means on the control room side. By transmitting information composed of the information to the work site, bidirectional communication between the control room and the work site is performed. With this configuration, video and wireless communication systems can be combined using data transfer devices to monitor work site conditions in the control room and send appropriate instructions from the control room to workers so that work can proceed efficiently. Can be.

[0011] Further, the radio telephone control station installed in the plant has a control jurisdiction area in which radio communication with the information portable terminal is possible and the current position of the information portable terminal carried by the worker is determined by the radio telephone relay station. It is characterized in that it is specified by the system controller whether it is within the control and monitoring area of the station. This makes it possible to grasp the position and work status of the worker in the control room in more detail and perform necessary control.

Further, the present invention is characterized in that, in the event of an emergency, a system controller communicates information relating to the handling of an individual emergency through an information portable terminal to a worker in a plant carrying the information portable terminal by image or voice. I do. Thus, the present system can be used as a means for sending an appropriate instruction according to the location of each worker in an emergency and ensuring safety in an emergency.

The portable information terminal according to the present invention comprises an information input means for inputting information to be transferred from an operator to a system controller, and a helmet worn by the operator. It is provided with voice input means for extracting the voice of the worker and transmitting it to the wireless telephone relay station. Accordingly, it is possible to exchange appropriate information while performing the work, reduce the burden on the worker, and perform communication of appropriate information on the work situation in real time.

The information input means of the portable information terminal is built in the helmet, and the worker can use the first input of the helmet.
Of a plurality of information items displayed on the display means is set so that information related to the specific item is input by gazing at the display unit of a specific item for a certain period of time and stopping the line of sight.
By adopting the line-of-sight input method in this way, the burden on the worker can be reduced and the time required for the work can be reduced.

Further, according to the present invention, as a work site image pickup apparatus, an image pickup area in which unit cells including photodiodes are arranged in a two-dimensional matrix on a semiconductor substrate, and a vertical selection means for selecting a readout row of this image pickup area And a plurality of vertical signal lines arranged in the column direction from which the detection signals of the photodiodes corresponding to the selected row are read out, and the detection signals are sequentially read out from these vertical signal lines to horizontal signal lines arranged in the row direction. A horizontal transistor, and a noise elimination circuit between the vertical signal line and the horizontal selection transistor, which converts a voltage appearing on the vertical signal line into charges, and suppresses noise by subtracting in a charge region. Using an image pickup device. As a result, it is possible to realize an imaging apparatus with lower power consumption than before, so that it is possible to monitor and control the situation of the work site in more detail by adding a surveillance camera as needed.

Further, according to the present invention, as an image pickup device used for an image input unit of a personal digital assistant, an image pickup area in which unit cells including photodiodes are arranged in a matrix two-dimensionally on a semiconductor substrate; Vertical selection means for selecting a readout row; a plurality of vertical signal lines arranged in a column direction for reading out a detection signal of a photodiode corresponding to the selected row; and horizontal signals arranged in a row direction from these vertical signal lines. A signal line is provided with a horizontal transistor for sequentially reading out a detection signal, and between a vertical signal line and a horizontal selection transistor, a voltage appearing on the vertical signal line is converted into a charge, and subtraction is performed in a charge region to reduce noise. An imaging device provided with a noise elimination circuit for suppressing noise is used. As a result, it is possible to realize an imaging device with lower power consumption than before, and thus it is possible to easily use the information portable terminal for a long time.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the intra-plant information communication system according to the present embodiment. The monitoring camera 1 installed at the work site 14 in the plant and the data transfer device 3a are connected by a video cable 11a. A radio telephone relay station 2 also installed at the work site
Is connected to the data transfer device 3a by a telephone cable 12a. The wireless telephone relay station 2 receives a wireless signal from the portable information terminal 10 used in the work place. Here, it is assumed that the wireless telephone relay station 2 is provided everywhere in the plant so that the entire area for performing information communication in the plant is in any of the relay station areas.

A work measuring instrument 16 such as a portable radiation measuring instrument used at the work site 14 includes a signal cable 13.
It can be connected to the portable information terminal 10 via d, and the data of the measuring device 16 can be transferred via the portable information terminal 10.

The data transfer device 3 installed at the work site 14
“a” is connected to the data transfer device 3b installed on the control room 15 side by a signal cable 13a. Information is exchanged by transferring data between the work site 14 and the control room 15 to each other by the two data transfer devices 3a and 3b.

On the other hand, a system controller 4 for managing the entire system is installed in the control room 15 and is connected to the data transfer device 3b by a video cable 11b. The system controller 4 is connected to the image display 6 via a video cable 11c, and a signal cable 13c.
e, it is connected to the database server 5, and it is connected to the image server 9 by the video cable 11d. An image in the work site 14 is displayed on the display 6, and information is managed and stored by the database server 5 and the image server 9. These pieces of information are called by the system controller 4 as needed.

The system controller 4 and the telephone controller 7 are connected by a signal cable 13c and a telephone cable 12b. Telephone controller 7 has telephone 8 and telephone cable
Connected at 12c.

The wireless telephone relay station 2 monitors and controls the information portable terminal 10 under its jurisdiction by making a wireless call. The radio telephone relay station 2 is used for such an information portable terminal 10.
Is constantly communicated to the telephone controller 7 in the control room via the data transfer devices 3a and 3b. Information about the terminal from the telephone controller 7 is transferred to the system controller 4. That is, the system controller 4
Reads the data of each wireless telephone relay station 2 inputted to the telephone controller 7 and stores information indicating when each information portable terminal 10 was in which relay station area in the map data in the system controller 4 for each relay station. Classify and record.
In this way, the position fluctuation of each portable information terminal 10 is accumulated in the system controller 4 in time series, and the control room can monitor which telephone relay station area each worker is in.

FIG. 2 is a front view of the portable information terminal. The portable information terminal 10 includes a wireless telephone unit 21 having an antenna 21a for performing wireless communication, a display 22 for both input and display, and an image input unit 23 using a small camera. In this way, the video, sound and instruction of the work site 14 are sent to the control room side, and the screen information and sound from the control room 15 are taken in.

FIG. 3 shows the information portable terminal 10 and other portable devices.
FIG. 16 is a front view showing a connection state with the device 16; Here, the portable device 16 is assumed to be a work measuring device such as a portable radiation measuring device. The external connection terminal of the portable information terminal 10 and the external connection terminal of the portable device 16 are connected by a dedicated signal cable 13d, and information such as measured values obtained by the portable device 16 is directly input to the portable information terminal 10 for data transfer. By transferring the data by the devices 3a and 3b, the burden on the operator is reduced and accurate measurement values are transmitted to the control room 15 side. The connection with the external connection terminal 10 is not limited to the portable device 16, and the above-described information transfer is also possible for a measuring device set up at a work site.

FIG. 4 is a block diagram showing a flow of information transfer between the system controller 4 and the surveillance camera 1. The surveillance camera 1 captures an image 24a of the work site 14 at a wide angle. The video 24a is sent to the system controller 4 via the data transfer devices 3a and 3b, and is displayed on the display 6 connected to the system controller 4. On the display 6, together with an enlarged image 24b of a part of the site image 24a (shown by a dashed box in the figure), data 26 on the device 25 shown in the enlarged image 24b and a screen control panel 27 are displayed together. Is done.

That is, at each work site 14, a device 25 such as a radiation dosimeter or a flow meter for measuring various data is used.
Then, the type of data 26 to be read for each device 25 is specified in advance. Then, data such as numerical values are read from the screen information, and settings are made so that the data is displayed on the display 6 of the system controller 4. In the example of the figure, a case where a dosimeter is shown as the device 25 is shown, but at this time, a dose value is shown as data 26.

Display 6 of system controller 4
Using the screen control panel 27 above, an operator in the control room 15 selects one of the devices shown in the on-site image 24a and makes it an enlarged image 24b to obtain necessary measurement information of the device. Can be.

The captured image 24a of the surveillance camera 4 or the enlarged image 24b on the display 6 is stored in the image server 9 connected to the system controller 4. This storage object is taken image 24a or enlarged image 24.
Whether or not b is selected can be selected by the system controller 4.

FIG. 5 is an explanatory diagram showing an example of a learning function provided by the present system. As an example of the learning function, a case where a worker performs similar work in a plurality of plants will be described.

In a certain plant A, an operator
The inspection work of the valve shown in (a) was performed. At this time, an inspection procedure consisting of five items related to the valve shown in FIG. 5A was prepared, and the inspection work was performed based on this. Next, in another plant B, an operator performs a check operation of the valve shown in FIG. At this time, although there are some differences in the inspection of the valve from plant to plant, the work content and the equipment used for the work are almost common among the plants. Therefore, a slight change or addition is made based on the inspection procedure already created in the plant A to newly create a valve inspection procedure in the plant B, and the inspection work is performed based on this. That is, the inspection procedure created in the plant A is stored in the database 5 in the system controller 4 as text data, and is called at the time of the inspection of the plant B to change the order of the work procedure, thereby creating the inspection procedure in the plant B. In the example of the figure, the plant A
, The valve is closed, the flow rate is measured, the valve is opened, and the radiation is measured. In the plant B, this order is changed.

As described above, the work inspection procedure for a plurality of plants can be easily created only by appropriately changing the order, so that the work can be performed in a short time in the inspection of a plurality of plants.

FIG. 6 is an explanatory diagram showing an example of a procedure of a work using the bidirectional transfer function at the work site 14 and the control room 15 of the video data by the present system. A case in which a worker carrying the information portable terminal 10 is performing a valve inspection work will be described.

As shown in FIG. 6A, the display 6 of the system controller 4 in the control room shows the situation 25a of the working site through the monitoring camera 1. On the other hand, on the display 22 of the information portable terminal 10 on the work site side, an inspection item check sheet 26a for valve inspection work is displayed. The operator inputs that the inspection has been completed among the inspection items from the terminal 10 and the corresponding item indicates that the inspection has been completed. Here, it is assumed that a worker wants detailed information on a certain inspection item. Here, as an example, it is assumed that an operator wants to obtain detailed information on a valve assembly procedure. At this time, the worker requests transmission of necessary information through the portable information terminal 10.

In response to the request signal, the operator of the system controller 4 in the control room 15 confirms the state of the site on the display and records the information stored in the image server 9 which records the progress of the work performed in the past. The user selects a necessary video from among them, and if necessary, attaches text data such as a description of the procedure for the work stored in the database server 5 to the video, outputs detailed image information, and searches for information. The image information 26b relating to the assembly of the valve is transferred and displayed on the display 22 of the terminal 10. The worker can reliably perform the work based on the past image and the description transferred in this manner.

The operation can be confirmed from the control room 15 through the display 6 of the system controller 4. By performing the bidirectional transfer of the video data in this way, it is possible to improve the accuracy and efficiency of the work by transmitting accurate information to the worker as needed.

The emergency response function of the present system will be described below. FIG. 7 shows a display example of the display 6 of the system controller 4 and the display unit 22 of the information portable terminal 10 carried by each worker when a fire, an earthquake, or the like occurs, as an example of the emergency response function. The emergency response function of the present system is to operate in the event of a trouble or emergency and to send necessary instruction information individually to workers, responsible persons and inspection factors.

As shown in FIG. 7A, in an emergency, the emergency response function operates automatically or manually, and the system controller 4 determines the position of each information portable terminal 10, that is, the position of the worker in the plant. Figure out. The display 6 of the system controller 4 shows the position information of the worker. Also, by the system controller 4,
Determine and identify workers who are in a position suitable for responding to emergency measures.

The display 22 of the portable information terminal 10 of the worker A responding to the emergency measures specifically indicates the emergency measure method as shown in FIG. 7B. In addition, on the display 22 of the information portable terminal 10 of the other operator B who needs evacuation, an optimal emergency evacuation route from the current position is specifically illustrated as shown in FIG. 7 (c). The work result and the evacuation progress information are transmitted to the system controller 4 one by one.

Hereinafter, the emergency response function will be described in detail. FIG. 8 is a flowchart showing a procedure when a worker under inspection finds a damaged valve.
The worker who discovers the breakage of the valve activates the emergency response system using the portable information terminal 10. As a result, the emergency response program of the system controller 4 is started, and the person in charge is automatically notified of the occurrence of the emergency by the communication means such as the portable information terminal 10. At this time, the image of the damaged portion is sent to the display 6 of the system controller 4 in the control room through the image input unit 23 of the portable information terminal 10 or by the wide-angle image of the surveillance camera 1. The person in charge will contact the person in charge and the person who is familiar with how to handle the damaged part. If urgency is high,
The emergency response system makes its own judgment and automatically notifies the person in charge at the same time as the person in charge and the person who is familiar with how to deal with the damaged part. The flow of the judgment of the degree of urgency and the automatic communication is set in advance in this emergency response program.

In some cases, the person in charge contacts the person who is familiar with the treatment method of the relevant place, and inquires the person in charge of the relevant manufacturer or the like. If the degree of urgency is high, the system controller 4 Will notify the person in charge of the relevant manufacturer or the like directly of the emergency.

In response to the notification / communication, the responsible person, the person in charge of the manufacturer, and the like make a study on how to deal with the situation. The system controller 4 supports such a study. First, the same countermeasure as that in the manual corresponding to the situation is displayed on the display 6 of the system controller 4.
Will be displayed. In addition, the information stored in the database 5 of the system controller 4 is automatically searched for a past case similar to the situation and a countermeasure for the case, and appropriate information is presented. Further, the system controller 4 checks with an instruction from a person in charge of the manufacturer or the like.

In accordance with the work execution method determined on the basis of such information, an instruction of a work procedure is input from the person in charge to the on-site worker via the system controller 4. Based on this, the work performed by the worker is sequentially confirmed in the control room by the above-described two-way transfer between the work site and the control room, and an appropriate instruction is given to the site, whereby the work proceeds smoothly.

For the peripheral workers who are working around the work site, the countermeasures regarding the peripheral devices are individually determined by the person in charge via the information portable terminal 10 of each worker via the system controller 4. Will be contacted.

At this time, the system controller 4 knows the position of the worker at each site by the portable information terminal 10 and the wireless telephone relay station 2 carried by each worker. Therefore, if there is a nearby worker who needs to be evacuated due to the valve breakage, an evacuation instruction is automatically sent to the relevant nearby worker through the portable information terminal 10 and an optimal evacuation route for the portable information terminal 10 is determined. Search and show evacuation guidance.

When the work or evacuation is performed quickly in this way, the system controller 4 completes the treatment at the site and evacuates the nearby workers based on the information on the information portable terminal 10 held by the on-site workers and the nearby workers. Confirm the completion, and inform the information portable terminal 10 of the person in charge and the responsible person that all work and evacuation are completed.

With such a series of emergency response functions, quicker and more accurate work and evacuation can be performed. Hereinafter, a second embodiment of the present invention will be described. This embodiment is an information portable terminal according to the first embodiment shown in FIG.
Instead of 10, a helmet-type information portable terminal 30 shown in FIG. 9 is used. The information portable terminal 30 has the functions of the information portable terminal built in a work helmet cap 31.

The helmet cap 31 has an antenna 32 for communicating with the radio telephone relay station 2. Information is displayed on the transmission type head-up display 33. The input of information is performed by an input remote controller (not shown), or a head-up display 33
It may be set so that some functions are operated by gazing at an object on the display 33 with the line of sight by applying the line of sight input technology. This display may be a head-mounted display.

An image capturing camera unit 34 is built in the top of the helmet cap 31 and sends a working image to the control room 15 side. A speaker 35 is attached to the ear cover,
Voice communication from the control room 15 is enabled. And this cap body
A voice input microphone 37 and a surrounding sound capturing microphone 38 are attached to a flexible arm 36 attached to 31, and a worker's voice is sent to the control room 15 side via an antenna 32. The ambient sound capturing microphone 38 is for capturing ambient noise in order to remove the noise entering the voice input microphone 37 by applying an opposite phase to extract only the voice of the worker.

The helmet-type information portable terminal 30 having such a structure is suitable for performing bidirectional communication with the control room 15 without hindering the work even if both hands are closed during the work. Therefore, according to the present embodiment, the same operational effects as those of the first embodiment can be obtained, and at the same time, the working efficiency can be further improved.

Hereinafter, a third embodiment of the present invention will be described. In the present embodiment, the surveillance camera 1 installed at the work site in the in-plant information communication system according to the first or second embodiment can perform noise suppression described in Japanese Patent Application No. 7-206143. This is an imaging device using an amplification type MOS sensor. FIG. 10 is a circuit configuration diagram of the imaging device according to the present embodiment.

In FIG. 10, the photodiode 41 (41-
1-1, 41-1-2,..., 41-3-3) amplifying transistors 42 (42-1-1, 42-1-2,.
, 42-3-3), a vertical selection transistor 43 (43-1-1, 43-1-2,...) For selecting a line from which a signal is read.
43-3-3), reset transistor 44 for resetting signal charge (44-1-1, 44-1-2,..., 44-3-3)
Are arranged two-dimensionally in a matrix. Although 3 × 3 cells are arranged in the figure, actually more unit cells are arranged.

The horizontal address lines 46 (46-1, 46-2, 46-) wired in the horizontal direction from the vertical shift register 55 are provided.
3) is connected to the gate of the vertical selection transistor 43 and determines a line from which a signal is read. Similarly, the reset line 47 wired in the horizontal direction from the vertical shift register 45
(47-1, 47-2, 47-3) are reset transistors
Connected to 44 gates. The source of the amplifying transistor 42 is connected to a vertical signal line 48 (48-1, 48-
2, 48-3), and one end thereof is provided with a load transistor 49 (49-1, 49-2, 49-3).

The vertical signal lines 48 (48-1, 48-2, 48)
-3) is the slice transistor 58 (58-1, 58-2, 58)
-3). A slice capacitor 59 (59-1, 59) is connected to the source of the slice transistor 58.
−2, 59-3) are connected, and the other ends thereof are connected to the slice pulse supply terminal 60. In order to reset the source voltage of the slice transistor 58, a slice reset transistor 62 (62-1, 62-2, 62-1) is connected between the source of the slice transistor 58 and the slice power supply terminal 61.
62-3) is provided, and a slice reset terminal 63 is connected to the gate of the transistor 62.

The drain of the slice transistor 58
The slice charge transfer capacitors 64 (64-1, 64-2, 64-3) are connected. In order to reset the drain charge of the slice transistor 58, the slice transistor
A drain set transistor 66 (66-1, 66-2, 66-3) is provided between the drain 58 and the storage drain power supply terminal 65, and a drain set terminal 67 is connected to the gate of the transistor 66. Further, the drain of the slice transistor 58 is connected to a horizontal selection transistor driven by a selection pulse supplied from the horizontal shift register 54.
It is connected to the horizontal signal line 55 via 70 (70-1, 70-2, 70-3).

In the imaging device configured as described above, the voltage appearing on the vertical signal line 48 is converted into electric charge, and subtraction is performed in the electric charge region, thereby suppressing noise. next,
A driving method of the imaging device will be described. FIG. 11 is a timing chart showing the operation of the present device, and FIG. 12 is a potential diagram of the slice transistor 58.

First, when an address pulse 101 for setting the horizontal address line 46-1 to a high level is applied, only the vertical selection transistor 43 of this line is turned ON, and a source follower circuit is constituted by the amplification transistor 42 and the load transistor 49 of this line. You. Then, a gate voltage of the amplification transistor 42, that is, a voltage substantially equal to the voltage of the photodiode 41 appears at the vertical signal line 48 and the gate of the slice transistor 58.

Next, a slice reset pulse 106 is applied to the slice reset terminal 63 to turn on the slice reset transistor 62 and initialize the charge of the slice capacitance 59. Further, the slice reset transistor 62 is turned off.
Then, the first slice pulse is supplied to the slice pulse supply terminal 60.
107 is applied. As a result, the channel potential V under the gate of the slice transistor 58 to which the signal voltage is applied.
Beyond _sch , the first slice charge is transferred to the drain. At this time, since the drain reset pulse 108 is applied to the drain reset terminal 67 and the drain reset transistor 66 is ON, the drain potential is fixed at the voltage V _sdd of the storage drain power supply terminal 65. Therefore, the first slice charge is discharged through the drain reset transistor 66.

Next, the drain reset transistor 66
Is turned off, a reset pulse 103 for setting the reset line 47-1 to a high level is applied, and the reset transistor 4 on this line is turned on to reset the signal charge. Then, a voltage appears when there is no signal charge in the vertical signal line 48 and the gate of the slice transistor 58. Next, a second slice pulse 109 is applied to the slice pulse supply terminal 60. As a result, the second slice charge is transferred to the drain beyond the channel potential _V0ch below the gate of the slice transistor 58 to which the voltage when there is no signal charge is applied. At this time, the drain reset transistor
Since the switch 66 is OFF, the second slice charge is transferred to the slice charge transfer capacitor 64 connected to the drain.

Next, the horizontal selection pulse 105 (105-1, 105-2, 105-3) is sequentially applied from the horizontal shift register 54 to the horizontal selection transistor 70 (70-1, 70-2, 70-3). The signals for one line are sequentially extracted from the horizontal signal line 55. By continuing this operation sequentially on the next line and the next line, all the two-dimensional signals can be read.

In this device, assuming that the value of the slice capacitance 59 is C _sl , the charge (second slice charge) finally read out to the horizontal signal line 55 is C _sl × (V _sch −V _0ch ), and the signal Since there is a charge proportional to the difference between when there is no signal and when there is no signal, the amplification transistor 42
Is characterized in that noise due to the threshold variation is suppressed.

Therefore, the imaging apparatus according to the present embodiment can suppress noise by converting the voltage appearing on the vertical signal line into charges and subtracting the charges in the charge area. In addition, power consumption can be further reduced as compared with the case where a conventional CCD camera or the like is used.

Taking advantage of the low power consumption of the surveillance camera 1 as described above, more surveillance cameras 1 are arranged at the work site, and the data transfer device 3 in the present embodiment is used.
The display 6 of the system controller 4 can be multi-channeled by using a and 3b to monitor the work site in detail. Moreover, the surveillance camera 1 in this case
In addition, since it is almost unnecessary to add a power supply capacity and a communication line, the expansion can be easily performed as compared with the related art.

Hereinafter, a fourth embodiment of the present invention will be described. In the present embodiment, the small camera of the image input unit 23 of the information portable terminal 10 in the in-plant information communication system according to the first or second embodiment performs noise suppression described in Japanese Patent Application No. 7-206143. This is an imaging apparatus using an amplifying MOS sensor capable of performing the above-described operations. The circuit configuration and operation of this imaging device have been described in the third embodiment, and a description thereof will not be repeated.

With this configuration, the same operation and effect as those of the first or second embodiment can be obtained, and at the same time, by adopting this imaging device, it is possible to realize an information portable terminal consuming less power than before. Even if a battery with the same performance is used, the terminal can be used for a long time.

[0065]

As described in detail above, according to the present invention, two-way communication between a work site and a control room by transmitting and receiving video, audio, and text data is easily and accurately performed, and a huge amount of data relating to the work is transmitted. By making appropriate selections and utilizing them effectively, the work situation is grasped sequentially in the control room, and necessary instructions are immediately sent to the site, thereby reducing the burden on the site workers, improving the accuracy of the work, and The required time can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of an intra-plant information communication system according to a first embodiment of the present invention.

FIG. 2 is a front view of the portable information terminal of the in-plant information communication system shown in FIG.

FIG. 3 is a front view showing a connection state between the portable information terminal shown in FIG. 2 and a measuring instrument for work.

4 is a block diagram showing a flow of information transmission between a system controller and a monitoring camera of the intra-plant information communication system shown in FIG.

5 (a) and 5 (b) are explanatory diagrams showing an example of a learning function of the in-plant information communication system shown in FIG.

6 (a) and 6 (b) are explanatory diagrams showing an example of a work procedure using a bidirectional video data transfer function of the intra-plant information communication system shown in FIG.

FIG. 7A is an explanatory diagram showing an example of a display display of a system controller when the emergency response function of the in-plant information communication system shown in FIG. 1 is used;
(B), (c) is explanatory drawing which shows an example of the display display of the portable information terminal in this case.

FIG. 8 is an explanatory diagram showing an example of a flow of an emergency response function of the intra-plant information communication system shown in FIG. 1;

FIG. 9 is a front view of a helmet-type information portable terminal of the in-plant information communication system according to the second embodiment of the present invention.

FIG. 10 is a circuit configuration diagram of an imaging device of an in-plant information communication system according to a third embodiment of the present invention.

FIG. 11 is a timing chart illustrating an operation of the imaging device of the in-plant information communication system according to the third embodiment of the present invention.

FIG. 12 is a potential diagram of a slice transistor in the imaging device of the in-plant information communication system according to the third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 surveillance camera 2 wireless telephone relay station 3a, 3b data transfer device 4 system controller 5 database / image server 6,22 display 7 telephone controller 8 telephone 9 video storage device 10 portable information terminal 11a, 11b, 11c, 11d, 11e video Cables 12a, 12b, 12c Telephone cables 13a, 13b, 13c, 13d Signal cable 14 Working site in plant 15 Control room 16 Measurement equipment for work 21 Wireless telephone unit 21a, 32 Wireless communication antenna 23, 34 Image capturing camera unit 31 Helmet cap 33 Head-up display 35 Speaker 37 Voice input microphone 38 Microphone for capturing ambient sound

Claims (8)

[Claims] 1. A work site imaging apparatus and a radio telephone relay station installed at a work site in a plant, a radio telephone unit for performing radio communication with the radio telephone relay station, and first display means for displaying an image and the work A portable information terminal having an image input unit for capturing an image of the site, a second controller provided in the control room for displaying information, and a system controller having information management means for storing information; provided on the control room side Telephone control means for connecting the telephone and the system controller to the control room, and an information transfer device for connecting the work site imaging device and the wireless telephone relay station at the work site. An in-plant information communication system, comprising: 2. The information transfer device transfers video and audio information of the work site to the control room side, and at least one of an image, a voice, and a text stored in the information management unit on the control room side. 2. The in-plant information communication system according to claim 1, wherein two-way communication between the control room and the work site is performed by transferring one piece of information to the work site side. 3. 3. The radio telephone control station installed in the plant has a control jurisdiction area capable of wireless communication with the information portable terminal, and the current position of the information portable terminal carried by the worker is 3. The intra-plant information communication system according to claim 1, wherein the system controller specifies whether the mobile telephone station is located in a control monitoring area of the wireless telephone relay station. 4. The system controller communicates, by an image or a voice, information regarding an individual emergency handling through the information portable terminal to an operator in a plant carrying the portable information terminal in an emergency. The in-plant information communication system according to claim 3, wherein 5. The portable information terminal comprises information input means for inputting information to be transferred from the worker to the system controller, and a helmet worn by the worker, and the helmet removes ambient noise. 5. The in-plant information communication system according to claim 4, further comprising voice input means for extracting a voice of the worker and transmitting the voice to the wireless telephone relay station. 6. The information input means is built in the helmet, and the worker operates the first input of the helmet.
6. The information related to a specific item among a plurality of items of information displayed on the display means is input by gazing at a display unit of a specific item for a certain period of time and stopping the line of sight. Information communication system in the plant. 7. The work site imaging apparatus includes: an imaging region in which unit cells including photodiodes are arranged in a matrix two-dimensionally on a semiconductor substrate; and a vertical selection unit that selects a readout row of the imaging region. A plurality of vertical signal lines arranged in a column direction for reading out a detection signal of a photodiode corresponding to a selected row, and a horizontal transistor for sequentially reading out detection signals from these vertical signal lines to a horizontal signal line arranged in a row direction And a noise removal circuit between the vertical signal line and the horizontal selection transistor, which converts a voltage appearing on the vertical signal line into charges, and subtracts the charges in a charge region to suppress noise. The in-plant information communication system according to claim 1, wherein the imaging device is incorporated in the information transfer device on the work site side. Tem. 8. An imaging device used for an image input unit of the portable information terminal, wherein an imaging region in which unit cells including photodiodes are arranged in a matrix two-dimensionally on a semiconductor substrate, and a readout row of the imaging region. , A plurality of vertical signal lines arranged in the column direction for reading out the detection signals of the photodiodes corresponding to the selected row, and horizontal signal lines arranged in the row direction from these vertical signal lines. A horizontal transistor that sequentially reads out a detection signal, and converts a voltage appearing on the vertical signal line into an electric charge between the vertical signal line and the horizontal selection transistor, and subtracts the electric charge in a charge region, thereby reducing noise. The intra-plant information communication system according to claim 1, wherein the information communication system is an imaging device including a noise removal circuit for suppressing noise.