JPH10240394A - Computer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a computer system with which plural input devices are arranged at the separate spots of arithmetic unit and the influence of noise is eliminated as well in such a case. SOLUTION: An arithmetic unit A and 1st and 2nd input devices B1 and B2 are connected by a balance signal transmission line 21 and with the 1st input device B1 as a main device, corresponding to the on signal input of input request switch 13 provided at the 2nd input device B, a switching control circuit 14 detects the end of transmission/reception signal of 1st input device B1 and switches input operation to the 2nd input device B2 later. A bidirectional signal between the arithmetic unit A, keyboard 2 and mouse 3 is converted to a unidirectional signal by signal mixer circuits 9 and 15 and signal separator circuits 10 and 16 and a balance signal is transmitted between respective line drivers 5, 7 and 11 and line receivers 6, 8 and 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer device provided with a plurality of input devices for one computing device, and a switch for connecting only one of the plurality of input devices to the computing device. The present invention relates to a computer device comprising means and capable of operating normally even when the plurality of input devices and the arithmetic device are arranged at a distance from each other.

[0002]

2. Description of the Related Art In general, a computer device of a level called a personal computer is provided with a keyboard and a pointing device such as a mouse and a trackball as input means. FIG. 8 shows the configuration of such a computer device.

FIG. 8 is a circuit diagram showing the configuration of a computer apparatus according to the prior art, which comprises an arithmetic unit 30 and a full keyboard 31 and a mouse 32 (or a trackball) as input means. The arithmetic unit 30
The keyboard 31 and the mouse 32 are connected by bidirectional transmission paths 27 and 28 for bidirectional TTL level signals.

The arithmetic unit 30 is provided with a communication control circuit 25a for bidirectional signal transmission with the keyboard 31 and a communication control circuit 26a for bidirectional signal transmission with the mouse 32. A communication control circuit 25b for bidirectional signal transmission with the arithmetic unit 30 is provided at 31, and a communication control circuit 26b for bidirectional signal transmission with the arithmetic unit 30 is provided at the mouse 32. When a control command is output from the arithmetic unit 30 to the keyboard 31, a data signal and a clock signal are output from the communication control circuit 25a, and the keyboard 31 is output through the bidirectional transmission path 27.
To the communication control circuit 25b. Conversely, when data is output from the keyboard 31 to the arithmetic device 30, a data signal and a clock signal are output from the communication control circuit 25b of the keyboard 31 and input to the communication control circuit 25a of the arithmetic device 30. Similar signal transmission is performed for the mouse 32.

[0005]

When the computer device configured as described above is used as a control device of a production facility such as an electronic component mounting device, an installation location of an arithmetic device and
In some cases, the input device must be installed at a distance of several meters or more. Since the bidirectional signal transmission between the arithmetic unit and the input device is a serial signal transmission, when the arithmetic unit and the input device are installed apart from each other in this way, the control signals between them are transmitted from peripheral devices to the control device. Malfunction may occur due to the noise of the control signal, or the control signal may cause electromagnetic interference to peripheral devices.

Further, there is a demand to perform an input operation on the arithmetic unit from a plurality of places. For example, in the case of an electronic component mounting apparatus, as shown in FIG. 2, the electronic component mounting apparatus 20 has electronic components to be mounted on its front and rear surfaces. The user performs operations such as setting electronic components on the front and rear surfaces, and inputs an operation command such as a type of a circuit board to be mounted from an input device of a computer device as a control device. However, the electronic component mounting apparatus 20 is a large facility by itself,
In addition, since these are line-structured, the front and rear surfaces cannot be freely moved between the front and rear surfaces. In order to improve work efficiency, it is necessary to be able to perform input operations to the computer device from both the front and rear surfaces. Had been requested.

However, in principle, the computing device and the input device of the computer device have a one-to-one correspondence. When a plurality of input devices are provided, one of the input devices performs an input operation. When an input operation is performed from the other input device, the input operation becomes invalid.

According to the present invention, a plurality of input devices are arranged for one arithmetic unit, and a single input operation can be performed by switching the input devices. It is an object of the present invention to provide a computer device adopting a signal transmission method that does not cause a failure as described above.

[0009]

According to a first aspect of the present invention, there is provided a computer apparatus comprising an arithmetic unit, an input unit, and a display unit. A plurality of combinations are provided, and the input device is provided with input operation request means for requesting an input operation to the arithmetic device, and when an input operation request is output by the input operation request means from one input device,
Switching means for switching the connection with the arithmetic device from the other input device to one input device after the end of the input operation of the other input device is detected is provided.

According to the above arrangement, a plurality of input devices can be arranged with respect to the arithmetic device, and only one input device can be connected to the arithmetic device by the switching means. Even if a combination of the above is arranged, there is a one-to-one correspondence between the arithmetic device and the input device.
The switching means, when an input request is made from the input request means provided in the input device, performs a switching operation after detecting the end of the input operation of another input device,
Even if there are a plurality of input devices, it does not hinder the ongoing input operation. In the control of a large-scale production facility, there are cases where it is desired to perform an input operation to the arithmetic unit from a plurality of places, and this can be effectively applied to such a request.

According to a second aspect of the present invention, there is provided a computing device, an input device having a keyboard and a pointing device, and a display device, wherein a bidirectional communication is provided between the computing device and the keyboard and the pointing device. In a computer device that performs signal transmission, a plurality of combinations of the input device and the display device are provided for the arithmetic device, and two bidirectional signals corresponding to the keyboard and the pointing device are combined into one. A signal mixing circuit that mixes the two-way signal into two-way signals corresponding to a keyboard and a pointing device while mixing the two-way signal into a two-way signal; And the received signal are separated into unidirectional signals, and the transmitted and received signals separated into unidirectional signals are bidirectional signals. A return signal separation circuit and a balanced signal conversion circuit that converts the unidirectional signal to a balanced signal and returns the balanced signal to a unidirectional signal are provided on the arithmetic device side and on each of the plurality of input devices. A balanced signal transmission line is connected between the balanced signal conversion circuit on the computing device side and the balanced signal conversion circuits on each of the plurality of input devices, and input operation request means for requesting the input device to perform an input operation on the computing device is provided. Switching means for, when an input operation request is output from one input device by the input operation requesting means, detecting that the input operation of another input device is completed, and switching the connection with the arithmetic device from the other input device to the one input device; Is provided.

In the above configuration, when it is desired to install the arithmetic unit and the input unit at a large distance from each other, signal transmission is performed by balanced signal transmission in order to prevent malfunction due to intrusion of noise from a signal transmission path therebetween. The input device is provided with a keyboard and a pointing device, and signals are transmitted as bidirectional signals between the keyboard and the pointing device. Therefore, in order to perform the balanced signal transmission with a small number of transmission lines, the signal transmission is performed. In the direction, two bidirectional signals corresponding to the keyboard and the pointing device are converted into one bidirectional signal by a signal mixing circuit, and the bidirectional signal is converted into a unidirectional signal of a transmission signal and a reception signal by a signal separation circuit. The one-way signal is converted into a balanced signal by a balanced signal conversion circuit and transmitted to a balanced signal transmission line. In the signal receiving direction, the balanced signal from the balanced signal transmission path is the reverse, a unidirectional signal,
The signal is converted into one bidirectional signal and two bidirectional signals, and the signal corresponding to the keyboard and the pointing device is transmitted. Further, a plurality of input devices are arranged, and the signal transmission between the input device and the arithmetic device requested to be input by the switching means is connected to the signal transmission path after detecting the end of the input operation of another input device. Is switched between the arithmetic device and the input device that has requested input.

Further, a third invention of the present application comprises a computing device, an input device having a keyboard and a pointing device, and a display device, and a bidirectional communication between the computing device and the keyboard and the pointing device. In a computer device for signal transmission, a plurality of the input devices are provided for the arithmetic device, and two bidirectional signals corresponding to the keyboard and the pointing device are mixed into one bidirectional signal. With one
A signal mixing circuit for returning the mixed two-way signal to two two-way signals corresponding to a keyboard and a pointing device, and converting the mixed two-way signal into a unidirectional signal of a transmission signal and a reception signal A signal separating circuit that separates the transmission signal and the reception signal into a bidirectional signal, and a light that converts the unidirectional signal into an optical signal and converts the optical signal into a unidirectional signal; A signal conversion circuit is provided on the arithmetic device side and on each of the plurality of input devices, and the optical signal conversion circuit on the arithmetic device side and the optical signal conversion circuit on each of the plurality of input devices are connected by an optical cable. And an input operation requesting means for requesting an input operation to the arithmetic device in the input device, and when an input operation request is output from the input operation requesting device from one input device, the input operation of the other input device is performed. Characterized in that the end of the work is provided with a switching means for switching the connection between the computing device to an input device from another input device after being detected.

In the above configuration, when it is desired to install the arithmetic unit and the input unit at a large distance, signal transmission is performed by optical signal transmission in order to prevent malfunction due to intrusion of noise from a signal transmission path therebetween. Therefore, an optical signal conversion circuit and an optical cable are used instead of the balanced signal conversion circuit and the balanced signal transmission line in the second invention. That is, in the signal transmission direction, the one-way signal converted by the signal separation circuit is converted into an optical signal by the optical signal conversion circuit and transmitted to the optical cable.
In the signal receiving direction, the optical signal from the optical cable is converted into a unidirectional signal in the opposite manner. According to this signal transmission configuration, the signal transmission path is electrically insulated by optical signal conversion, so that common mode noise is removed, and the optical cable is not affected by electromagnetic noise. Can also prevent malfunction due to the influence of noise. Therefore,
When computer equipment is used to control production equipment, the effects of noise are small even in environments with large ambient noise, and conversely, the effects on peripheral devices due to the emission of noise from the signal transmission line can be eliminated. it can.

Further, the signal mixing circuit according to the second and third inventions mixes two bidirectional signals corresponding to a keyboard and a pointing device by transferring them in a time-division manner into one bidirectional signal. By canceling the time division, the combined two-way signal is returned to two two-way signals corresponding to the keyboard and the pointing device.

The signal transmission between the arithmetic unit and the keyboard and the pointing device is two bidirectional signals of the arithmetic unit to the keyboard, the keyboard to the arithmetic unit, the arithmetic unit to the pointing device, and the pointing device to the arithmetic unit. Is transferred in a time-sharing manner,
It can be converted into one bidirectional signal. Conversely, by canceling the time division transfer, one bidirectional signal can be returned to two bidirectional signals.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The embodiment described below is an example embodying the present invention, and does not limit the technical scope of the present invention.

FIG. 1 is a block diagram showing a configuration of a computer device according to a first embodiment of the present invention, and FIG. 2 is a front view (a) of an electronic component mounting device in which the computer device according to the present embodiment is applied as a control device. 3) is a perspective view showing a rear surface appearance (b).

In FIG. 1, a computer device 1 according to the first embodiment is configured as a control device for controlling a mounting operation of an electronic component mounting device 20 shown in FIG. It comprises a first input device B1 disposed on the front side of the device 20 and a second input device B2 disposed on the rear side of the electronic component mounting device 20.

The computer device 1 is replaced with an electronic component mounting device 2
When it is used as a control device of a production facility such as 0, the arithmetic unit A and the input devices B1 and B2 may have to be installed at remote positions. Further, when an input operation is desired to be performed from two places of the input devices B1 and B2, it is necessary to set a use state different from a general use state.

The installation location of the production equipment is an environment in which other production equipment and incidental equipment are present in the surroundings, and there are many sources of noise that adversely affect the computer device 1, and at the same time, unnecessary radiation from the computer device 1 is generated. It can also cause electromagnetic interference to surrounding equipment. Therefore, when the signal transmission path between the arithmetic unit A of the computer device 1 and the input devices B1 and B2 becomes long, a configuration that is not affected by noise and does not radiate noise is required. Further, when an input operation is performed on the arithmetic unit A from two places,
Input operations cannot be performed at the same time from a single location, and simply performing a switching operation will impede each other's input operations. The computer device 1 according to the present embodiment has a configuration corresponding to a special state when used as a control device of a production facility as described above.

The first input device B1 and the second input device B2 each include a keyboard 2, a mouse (pointing device) 3, and a display device 4. In this computer device 1, one arithmetic unit A
Since there are two input devices B1 and B2, the first input device B1 or the second input device B2 is connected to the arithmetic unit A by switching. In the case of the present embodiment, as shown in FIG. 2A, the first input device B1 disposed on the front surface of the electronic component mounting device 20 is used as a main input device, and as shown in FIG. The second input device B2 disposed on the rear surface of the electronic component mounting device 20 makes an input operation request, and after detecting that the input operation of the first input device B1 has been completed, performs an arithmetic operation. Connection to device A is first
From the input device B1 to the second input device B2. The input operation request can be made by an input request switch (input operation request means) 13 provided in the second input device B2. Regarding the control of the switching operation for switching the connection to the arithmetic device A to the first input device B1 or the second input device B2, the signal transmission between the arithmetic device A and the first and second input devices B1, B2 A description will be given after the configuration is described.

The arithmetic unit A of the computer device 1 having the above-described configuration is arranged at a distance from the first input device B1 and the second input device B2, which is farther than the normal arrangement. Therefore, a configuration of signal transmission for preventing noise from being mixed in the signal transmission line during the period and for reducing the number of transmission lines is provided.

Signal transmission between the keyboard 2 and the mouse 3 of the first and second input devices B1 and B2 and the arithmetic unit A is bidirectional signal transmission, respectively. In the transmission direction to the arithmetic unit A, the corresponding two bidirectional signals are mixed by the signal mixing circuit 9 to be converted into one bidirectional signal. The signal is converted into a unidirectional signal with the received signal, and is converted into a line driver (balanced signal conversion circuit) 11 and a line receiver (balanced signal conversion circuit) 12
To the balanced signal transmission path 21. Conversely, in the receiving direction from the arithmetic unit A, the balanced signal from the balanced signal transmission path 21 is converted into a unidirectional signal by the line receiver 12, and the unidirectional signal is converted into one bidirectional signal by the signal separating circuit 10. Then, the mixing is released by the signal mixing circuit 9 and converted into two bidirectional signals corresponding to the keyboard 2 and the mouse 3 respectively.

On the other hand, two directions corresponding to the keyboard interface 18 and the mouse interface 17 connected to the system bus of the arithmetic unit A correspond to the transmission directions to the first and second input devices B1 and B2. In, the signal is mixed by a signal mixing circuit 15 and converted into one bidirectional signal, and one bidirectional signal is converted by a signal separation circuit 16 into a unidirectional signal of a transmission signal and a reception signal, and the switching control circuit 14 Then, the first input device B1 is connected to the balanced signal transmission line 21 by the line driver 5 and the second input device B2 is connected to the balanced signal transmission line 21 by the line driver 7. Conversely, the first and second input devices B1, B2
In the receiving direction, the balanced signal from the balanced signal transmission path 21 is converted into a unidirectional signal by the line receiver 6 or 8, the unidirectional signal is converted into one bidirectional signal by the signal separating circuit 16, and the signal is mixed. The mixing is released by the circuit 15 and converted into two bidirectional signals of the keyboard interface 18 and the mouse interface 17, respectively.

FIG. 3 shows the signal mixing circuit 15 of the arithmetic unit A.
2 is a circuit diagram illustrating a configuration of a signal separation circuit 16. FIG.

In FIG. 3, when a control command is output from the arithmetic unit A to the keyboard 2 or the mouse 3, two asynchronous transmission signals output from the keyboard interface 18 or the mouse interface 17 of the arithmetic unit A are: Mixing control LSI 15 in signal mixing circuit 15
a, and two transmission signals are converted into one transmission signal by a predetermined conversion procedure. Conversely, data input from the keyboard 2 or the mouse 3 is a mixed control LSI
15a, one received signal is converted into two received signals composed of a data signal and a clock signal by a preset conversion procedure, and the keyboard interface 1
8 and the mouse interface 17.

The mixing operation of the signals by the mixing control LSI 15a is performed by time-division transfer as shown in FIG. A transmission signal from the computing device A to the keyboard 2, a transmission signal from the keyboard 2 to the computing device A, a transmission signal from the computing device A to the mouse 3, and a transmission signal from the mouse 3 to the computing device A at a certain synchronous timing. To divide. In the figure, synchronization (1) is a timing at which a transmission signal is output from the arithmetic device A to the keyboard 2, and synchronization (2) is a timing at which a transmission signal is output from the keyboard 2 to the arithmetic device A. , Synchronization (3) is a timing for outputting a transmission signal from the arithmetic unit A to the mouse 3, and synchronization (4) is a timing from the mouse 3 to the arithmetic unit A.
This is the timing at which the transmission signal is output toward. Thereafter, synchronization (1) to (4) are repeated.

The signal separating circuit 16 shown in FIG. 3 converts one bidirectional signal converted by the signal mixing circuit 15 into a unidirectional signal and conversely converts a unidirectional signal into one bidirectional signal. I do. When a signal is transmitted from the arithmetic unit A to the keyboard 2 or the mouse 3, one bidirectional signal is obtained by transmitting a communication control command to a data signal input in accordance with a communication procedure and a communication speed preset by the separation control LSI 16a. It is added and output as a transmission signal. On the other hand, the received signals from the first or second input device B1, B2 are input to the separation control LSI 16a, and the communication control command is deleted from the received signals in accordance with a preset communication procedure and communication speed to calculate. The data signal and the clock signal are output to the signal mixing circuit 15 as input data to the device A.

The signal mixing circuit 9 and the signal separation circuit 10 on the first and second input devices B1 and B2 have the same configuration, and include two bidirectional signals of the keyboard 2 and the mouse 3 and one bidirectional signal. , And between a bidirectional signal and a unidirectional signal.

FIG. 5 is a circuit diagram showing a configuration for connecting a unidirectional signal of a transmission signal and a reception signal by a balanced signal transmission line.

Signal transmission between the arithmetic unit A and the first input device B1 is performed by a line driver 5, a line receiver 12,
Balanced signal transmission lines 21 and 21 each formed by a twisted pair line between the line driver 11 and the line receiver 6
The signal transmission between the arithmetic unit A and the second input device B2 is performed by the balanced signal transmission paths 21 and 21 between the line driver 7 and the line receiver 12 and between the line driver 11 and the line receiver 8 respectively. They are connected so that unidirectional signals can be transmitted as balanced signals.

Since the line receivers 6, 8, and 12 in this balanced signal transmission are configured as differential amplifiers, common mode noise is removed, and the balanced signal transmission path 21 is a pair of two pairs having higher balance. Since twisted pair wires are used, normal mode noise is less likely to occur, signal transmission with excellent noise resistance can be performed, and even if the signal transmission distance is long, malfunction due to external noise and peripheral equipment due to unnecessary radiation Can be eliminated.

Therefore, according to the above configuration, since the arithmetic unit A and the first and second input devices B1 and B2 are connected by the balanced signal transmission line 21, they are hardly affected by noise from peripheral devices. On the contrary, since no electromagnetic interference is given to the peripheral devices, a normal operation can be ensured even when the arithmetic unit A and the first and second input devices B1 and B2 are installed at separated points in the production facility. .

Arithmetic unit A and first and second input units B
As shown in FIG. 6, the signal transmission between the line drivers 1 and B2 is performed by connecting the line drivers 5, 7 and 11 to electric signal-optical signal conversion circuits 34, 35 and 38, and connecting the line receivers 6, 8 and 12 to light. Signal-electric signal conversion circuits 36, 37 and 39
, And the balanced signal transmission path 21 may be replaced with an optical cable 40, and the signal transmission may be performed by an optical signal.

Since signal transmission using an optical signal electrically insulates a signal transmission path, it is possible in principle to remove common mode noise and to reduce large common mode noise that cannot be eliminated in balanced signal transmission. It also works effectively. Therefore, even when the computing device A and the input device B are installed at a distance from each other in a production facility or the like having many noise sources, there is a particularly large source of inductive noise that is hardly affected by noise from peripheral devices. It is effective in such an environment. Further, since optical signal transmission does not generate electromagnetic radiation in principle, it does not cause electromagnetic interference to peripheral devices.

The above-described configuration in which the electric signal is converted into an optical signal and the signal transmission path is insulated can also be implemented by interposing a photocoupler in the signal transmission circuit.

Next, the arithmetic unit A is provided with two input units B1,
The configuration and control operation for switching and connecting B2 will be described.

In FIG. 1, in the computer device 1 having this configuration, a first input device B 1 and a second input device B 2 exist for one arithmetic device A. Either one can be performed, and this switching is performed by the switching control circuit 1 provided in the arithmetic unit A.
4. The operation of the switching control circuit 14 for controlling the switching between the first input device B1 and the second input device B2 will be described with reference to the flowchart shown in FIG. Note that S1, S2,... Shown in the figure are step numbers indicating control procedures, and correspond to numbers added to the text.

As shown in FIG. 1, the switching control circuit 14
Has a line driver 5 connected to the first input device B1.
, A line driver 6 connected to the second input device B2, and a line receiver 8 connected to the second input device B2.
The switching control circuit 14 connects to the signal separation circuit 16 by passing only the signal transmission on the side where the input operation is valid.

In the initial state where the power of the computer device 1 is turned on, the first input device B1 disposed on the front surface of the electronic component mounting device 20 is used as the main input device. The operation becomes effective (S1), and the switching control circuit 14 connects the line receiver 6 and the line driver 5 to the signal separation circuit 16. At this time, since the connection between the line receiver 8 and the line driver 7 and the signal separation circuit 16 is disconnected, the input operation of the second input device B2 becomes invalid and the input operation cannot be performed (S2).

If only the input operation by the valid first input device B1 is performed, the keyboard 2 or the mouse 3
If there is no transmission / reception of the transmission signal associated with the input operation by the user, this control operation ends (S3).

When the input operation is required in the second input device B2, the input request switch 13 is turned on (S4), and the on operation signal is switched to the switching control circuit 14
Is input to At this time, the switching control circuit 14 temporarily holds the input request and detects the presence or absence of the transmission and reception of the signal with the currently enabled first input device B1 (S
5) When the end of transmission / reception of the first input device B1 is detected, the input operation of the second input device B2 requested to be input is validated (S6), and the input operation of the first input device B1 is invalidated. (S7).

When the input operation of the second input device B2 that has become effective is completed, the input request switch 13 is turned on again (S8), and the ON operation signal is input to the switching control circuit 14 again. Therefore, the switching control circuit 1
4 detects the end based on the presence / absence of a transmission / reception signal with the second input device B2 in the same manner as described above (S9).
2 is invalidated, and the input operation by the first input device B1 is validated (S1).

Therefore, the ending operation of the computer device 1 can be ended in a state where the operation of the first input device B1 is valid. The bold line display of the signal transmission path illustrated in FIG. 1 indicates a transmission / reception path of a transmission signal between the arithmetic device A and the first input device B1 in a state where the first input device B1 is enabled.

In the present configuration, the input request switch 13 is provided in the second input device B2, but the input request switch 1 is provided in both the first and second input devices B1 and B2.
3 may be provided so that the input operation on the side that has requested the input becomes valid after the end of the other input operation is detected.

Although the computer apparatus 1 according to the present embodiment described above has been applied to the electronic component mounter 20, the general use as a personal computer,
Even when used for controlling other mechanical devices, the present invention can be applied to a case where a plurality of input devices are to be arranged for one arithmetic device, or a case where the distance between the arithmetic device and the input device is to be increased. it can.

[0048]

As described above, according to the first aspect of the present invention, a plurality of input devices are arranged for an arithmetic device, and only one input device can be connected to the arithmetic device by the switching means. Even if a combination of an input device and a display device is arranged in a plurality of locations, the number of the arithmetic device and the input device is
A one-to-one correspondence is made. The switching means executes the switching operation after detecting the end of the input operation of another input device when an input request is made from the input requesting device provided in the input device. It does not interfere with ongoing input operations. In the control of a large-scale production facility, there are cases where it is desired to perform an input operation to the arithmetic unit from a plurality of places, and this can be effectively applied to such a request.

Further, according to the second aspect of the present invention, when it is desired to install the arithmetic unit and the input unit at a large distance from each other, a signal transmission is prevented in order to prevent a malfunction due to intrusion of noise from a signal transmission path therebetween. Is performed by balanced signal transmission. The input device is provided with a keyboard and a pointing device, and signals are transmitted as bidirectional signals between the keyboard and a pointing device, so that the balanced signal is transmitted with a small number of transmission lines. Each side and the plurality of input devices convert two bidirectional signals in the transmission direction, one bidirectional signal, a unidirectional signal, and a balanced signal in the order of transmission, and perform the conversion in the reverse order in the reception direction. Perform the conversion. With this configuration, even if the signal transmission path is lengthened by separating the arithmetic device and the input device, the influence of noise is small due to the balanced signal transmission. No malfunction or electromagnetic interference to peripheral devices. Furthermore, since input devices can be arranged in a plurality and switching can be made to signal transmission between the input device that requested input and the arithmetic device, the input operation can be performed from a plurality of places such as a large-scale production facility, and the production operation can be performed. Efficiency can be improved.

Further, according to the third aspect of the present invention, when it is desired to install the arithmetic unit and the input unit at a large distance from each other, signal transmission is prevented in order to prevent malfunction due to intrusion of noise from the signal transmission line between them. Is performed by optical signal transmission, and an optical signal conversion circuit and an optical cable can be used instead of the balanced signal conversion circuit and the balanced signal transmission line in the second invention. According to this configuration, since the signal transmission line is electrically insulated by the optical signal conversion, common mode noise is removed, and the optical cable is not affected by electromagnetic noise. Malfunction due to the influence can be prevented. Therefore, when a computer device is used to control a production facility, the influence of noise is small even in an environment with large peripheral noise, and conversely, the influence on peripheral devices due to radiation of noise from a signal transmission line is also eliminated. be able to.

Further, the signal mixing circuit according to the second and third inventions converts two bidirectional signals between the arithmetic unit and the keyboard and the pointing device into one bidirectional signal when they are transferred in a time-division manner. By canceling the time division transfer, one bidirectional signal can be
Can return to two bi-directional signals. By converting these two bidirectional signals into one bidirectional signal, the number of signal transmission lines can be reduced, and the intrusion of noise can be prevented.

[Brief description of the drawings]

FIG. 1 is an exemplary block diagram showing the configuration of a computer device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a front appearance (a) and a rear appearance (b) of an electronic component mounting machine in which a computer device is applied as a control device.

FIG. 3 is a circuit diagram showing a configuration of a signal mixing circuit and a signal separation circuit.

FIG. 4 is a synchronous timing chart for explaining the timing of time division by the signal mixing circuit.

FIG. 5 is a circuit diagram showing a configuration of balanced signal transmission.

FIG. 6 is a circuit diagram showing a configuration of optical signal transmission.

FIG. 7 is a flowchart showing a control procedure of a switching control circuit.

FIG. 8 is a circuit diagram showing a configuration of a computer device having a conventional configuration.

[Explanation of symbols]

 Reference Signs List 1 computer device 2 keyboard 3 mouse (pointing device) 4 display device 5, 7, 11 line driver (balanced signal conversion circuit) 6, 8, 12 line receiver (balanced signal conversion circuit) 9, 15 signal mixing circuit 10, 16 signal Separation circuit 13 Input request switch (input operation requesting means) 14 Switching control circuit (switching control means) 21 Balanced signal transmission line 34, 35, 38 Electric signal-optical signal conversion circuit 36, 37, 39 Optical signal-electric signal conversion circuit 40 optical cable A computing device B1 first input device B2 second input device

Claims (4)

[Claims] 1. A computer device comprising a computing device, an input device, and a display device, wherein a plurality of combinations of the input device and the display device are provided for the computing device, A device is provided with input operation requesting means for requesting an input operation to the arithmetic device, and when an input operation request is output from one input device by the input operation requesting device, the end of the input operation of another input device is detected. A computer device comprising a switching unit for switching a connection with an arithmetic device from another input device to one input device. 2. A computer device comprising an arithmetic device, an input device having a keyboard and a pointing device, and a display device, wherein bidirectional signal transmission is performed between the arithmetic device and the keyboard and the pointing device. In the arithmetic device, a plurality of combinations of the input device and the display device are provided, and two bidirectional signals corresponding to the keyboard and the pointing device are mixed into one bidirectional signal. A signal mixing circuit for returning a mixed bidirectional signal to two bidirectional signals corresponding to a keyboard and a pointing device, and a unidirectional transmission of a mixed bidirectional signal to a transmission signal and a reception signal A signal separation circuit that separates the transmission signal and the reception signal separated into a unidirectional signal into a bidirectional signal while separating the signal into signals.
A balanced signal conversion circuit for converting the one-way signal into a balanced signal and returning the balanced signal to a one-way signal is provided on each of the computing device side and each of the plurality of input devices, and a balanced signal on the computing device side is provided. The conversion circuit and the balanced signal conversion circuit on each of the plurality of input devices are connected by a balanced signal transmission line, and the input device is provided with input operation requesting means for requesting an input operation on the arithmetic device. When an input operation request is output by the input operation requesting means, a switching means is provided for switching the connection with the arithmetic device from the other input device to one input device after the completion of the input operation of the other input device is detected. Computer device. 3. A computer device comprising an arithmetic device, an input device having a keyboard and a pointing device, and a display device, wherein bidirectional signal transmission is performed between the arithmetic device and the keyboard and the pointing device. In the arithmetic device, a plurality of combinations of the input device and the display device are provided, and two bidirectional signals corresponding to the keyboard and the pointing device are mixed into one bidirectional signal. A signal mixing circuit for returning a mixed bidirectional signal to two bidirectional signals corresponding to a keyboard and a pointing device, and a unidirectional transmission of a mixed bidirectional signal to a transmission signal and a reception signal A signal separating circuit that separates a transmission signal and a reception signal separated into unidirectional signals into the bidirectional signals while separating the signals into signals. An optical signal conversion circuit for converting the one-way signal into an optical signal and returning the optical signal to a one-way signal, provided on the arithmetic device side and on each of the plurality of input devices; An optical cable is connected between the signal conversion circuit and each of the plurality of input device-side optical signal conversion circuits, and input operation requesting means for requesting the input device to perform an input operation on the arithmetic device is provided. When an input operation request is output by the request unit, a switching unit is provided for switching the connection with the arithmetic unit from the other input device to one input device after the completion of the input operation of the other input device is detected. Computer device. 4. A signal mixing circuit mixes two bidirectional signals corresponding to a keyboard and a pointing device in a time-division manner by transferring them in a time-division manner, and cancels the time-divisions by transferring the two-way signals. 4. The computer device according to claim 2, wherein the mixed two-way signal is returned to two two-way signals corresponding to a keyboard and a pointing device.