JP2002231081A - Switch operation detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the wiring and improve fabrication by making the number of wirings of the device having a plurality of switches, to two. SOLUTION: This is a switch operation detecting device that comprises a plurality of constant current elements, switch circuits that are respectively connected in series to the constant current element, a power source part that is connected in parallel to each of the series circuits of the constant current element and the switch circuit, and a current measuring part that measures the current value flowing from the power source part to all the circuits. The constant current element, of which current value is set at different value respectively, identifies the switch circuit that is made operation by the current value detected by the current measuring part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch operation detecting device, and more particularly to a switch operation detecting device for detecting several types of call switch operations and recovery switch operations in a child terminal of a nurse call system.

[0002]

2. Description of the Related Art In a hospital or the like, a nurse call system for communicating between a child unit provided in each bed of a hospital room and a parent unit provided in a nurse station is frequently used.

As shown in FIG. 3, the nurse call system includes a nurse call slave unit 50 and a corridor lamp 53 connected to the nurse call slave unit 50 by a line L1.

The nurse call slave unit 50 includes a hand-type slave unit 51 provided on each bed of a hospital room and having a call button 51b for enabling a call to the master unit, and a hand-type slave unit 51.
Call button 51 for calling the parent device connected to
a, a hand-type slave unit 51 is connected, and an outlet 52 having a staff call button 52a for making an emergency call (staff call) and a restoration button 52b for restoring the call is provided.

[0005] A corridor lamp 53 is installed in a corridor of a hospital room or the like, is connected to an outlet 52 of a nurse call slave unit 50 via a line L1, and displays a patient name for displaying a patient name using a bed provided with the nurse call slave unit 50. Unit 53a, and an operation display unit 53b for performing a display corresponding to a button operation from the nurse call slave unit 50, and controls transmission and reception of information between the master unit (not shown) and the nurse call slave unit 50. A control unit (not shown) is provided.

[0006] Such a nurse call system is provided with a switch operation detecting device for detecting that each button provided on the nurse call slave unit 50 has been operated.

[0007] The switch operation detection device, as shown in FIG. 4, the grip recall switch circuit S ₅ provided is connected to grip call switching element 51Sa which is switched by makeup operation grip call button 51a, the call button 51b Makeup Call switch element 51S switched by operation
b is connected and provided with a hand-type slave unit switch circuit S
_50, provided on the outlet 52, recovery switch staff call switching circuit S ₅₁ staff call switching element 52Sa which is switched by makeup operation staff call button 52a is provided, it is restored switching element 52Sb that is switched by the recovery button 52b provided a circuit S ₅₂ are provided. CPU 53c for hallway light 53
The CPU 53c is provided with a handgrip call switch element 51Sa and a call switch element 51Sb.
2. Connected via line L1. A staff call switch element 52Sa provided in the outlet 52
And the recovery switch element 52Sb are connected to the CPU 53c via the line L1 and to the reference potential point.

In such a switch operation detection device, when a make-up operation is performed on the bedside grip call button 51a, the grip call switch element 51Sa is closed,
A make contact signal is transmitted, and outlet 52, line L
1 is detected by the CPU 53c of the corridor lamp 53. As a result, a call is displayed on the operation display unit 53b provided corresponding to the patient name display unit 53a of the corridor lamp 53, and a call signal is output to the master unit provided at the nurse station to make a call. Similarly, call button 5
When the make operation is performed on 1b, the call switch element 51Sb
Is closed, a make contact signal is transmitted, and the outlet 5
2. Detected by the CPU 53c of the corridor lamp 53 via the line L1.

When the stuff call button 52a or the recovery button 52b is operated to make a make-up operation at the outlet 52 to which the hand-type slave unit 51 whose make-up call button 51a has been made is operated, the stuff call switch element 52Sa or the restoration switch is operated. The element 52Sb is closed, a make contact signal is sent out, and via the line L1,
Detected by the CPU 53c of the hallway lamp 53, a staff call is displayed on the operation display unit 53b, or the display is deleted and the call is restored.

[0010]

However, in such a switch operation detecting device, the number of wirings of the line L1 between the outlet and the corridor lamp increases with the number of installed switches, which is not efficient in construction. In addition, a detection circuit corresponding to each switch is required, and the circuit becomes complicated. In particular, when a plurality of nurse call slave units are connected to the corridor lamp, the number of wirings is increased, which has been an obstacle in construction.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to simplify the apparatus, minimize the number of wirings, reduce the number of wirings, and improve the efficiency in construction regardless of the number of switches. It is an object of the present invention to provide a switch operation detecting device that can perform the operation.

[0012]

In order to achieve the above object, a switch operation detecting device according to the present invention comprises a plurality of constant current elements, a switch circuit connected in series to each of the constant current elements, and a constant current element and a switch circuit. A switch operation detection device including a power supply unit connected in parallel to each of the series circuits, and a current measurement unit that measures a current value flowing from the power supply unit to the entire circuit, wherein the constant current elements have different current values. Is used to specify the operated switch circuit from the current value detected by the current measuring unit.

In this switch operation detecting device, constant current elements each having a different current value corresponding to each switch circuit are provided in series with the plurality of switch circuits, and the constant current elements are connected in parallel to the power supply section. By measuring the value of the current flowing through the entire circuit, it is possible to detect the switch circuit that is turned on by the operation. Therefore, irrespective of the number of switch circuits, the number of wirings used for switch detection can be reduced to two, thereby reducing the number of wirings and improving workability.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a switch operation detecting device of the present invention is applied to a nurse call system will be described in detail with reference to the drawings.

As shown in FIG. 1, a nurse call system to which a switch operation detecting device according to the present invention is applied includes a nurse call sub device 10 having a hand-type sub device 1 and an outlet 2, and a nurse call sub device 10 And a corridor lamp 3 connected by a line L.

The nurse call slave unit 10 is provided on each bed of the sick room and has a hand-type slave unit 1 having a call button 1b for enabling a call to the master unit. Hand button 1a for making a call, a staff call button 2a for making an emergency call (staff call), a recovery button 2b for making a call, and a toilet grip And an outlet 2 having a call button 2c.

A corridor lamp 3 is installed in a corridor of a hospital room or the like, is connected to the outlet 2 of the nurse call slave unit 10 via a line L, and displays a patient name for displaying a patient name using a bed on which the nurse call slave unit 10 is provided. Unit 3a, an operation display unit 3b for performing display corresponding to button operation from the nurse call slave unit 10, and a master unit (not shown);
A control unit (not shown) for controlling transmission and reception of information between the nurse call slave units 10 is provided.

As shown in FIG. 2, a switch operation detecting device applied to such a nurse call system is provided with a grip call switch element 1Sa which is connected by a make operation of a grip call button 1a. a circuit S _10, the hand Katachiko machine switching circuits S ₀ provided call switching element 1Sb which is switched by makeup operation of the call button 1b is connected, is incorporated in the outlet 2 is switched by a make-up operation staff call button 2a Staff call switch element 2Sa
Staff call switch circuits S ₁ to is provided, and recovery switch circuit S ₂ the recovery switching element 2Sb is provided to be switched by the makeup operation recovery button 2b, toilet recall switch element 2Sc which is switched by makeup operation of toilets call button 2c and toilet recall switch circuit S ₃ provided is provided. These hand-type slave unit switch circuit S ₀ , staff call switch circuit S ₁ , restoration switch circuit S ₂ , and toilet call switch circuit S ₃ include:
The constant current elements 11a, 12a, 12b, and 12c are connected in series. Furthermore, the hand Katachiko machine 1, the hand Katachiko machine switching circuits S ₀ and a constant current element 11 are connected in series
a, and a constant current element 10a for detecting disconnection or disconnection of the hand-type slave unit 1 from the outlet 2 in parallel connection with the constant current element 11a, and a stuff call switch circuit S ₁ connected in series to the outlet 2 And constant current element 12
a, the recovery switch circuit S ₂ and the constant-current element 12b are connected in series, toilet recall switch circuit S ₃ is connected in series
And the constant current element 12c are connected in parallel to two lines L. Further, the corridor lamp 3 is provided with a power supply unit 3Sa for supplying power to these circuits and a current measurement unit 3Sb connected in series to the line L. Current measuring unit 3S
b is connected to a CPU (not shown), so that control corresponding to the measured current value is performed.

In the switch operation detecting device having such a configuration, the current value of each constant current element connected to each switch circuit is set to 2 ⁿ (n = 0, 1, 2, 3,...). For example, the constant current element 11a which is connected to the hand Katachiko machine switching circuits S ₀ and grip recall switch circuit S ₁₀
1mA current value, 2 mA current value of the constant current element 12a which is connected to the staff call switch circuits S _1, the current value of the constant current element 12b which is connected to the recovery switch circuit S ₂ 4mA, toilet recall switch circuits S The current value of the constant current element 12c connected to ₃ is set to 8 mA. The constant current element 10a for detecting the detachment and disconnection of the hand type slave unit 1
Is set to 3 mA.

In the switch operation detecting device set as described above, if the measured value of the current measuring unit 3Sb is 3 mA or less, dropout or disconnection of the hand type slave unit 1 is detected. Also, when there is no dropping or disconnection of the hand-held slave device 1 and the make / call button 1a or the call button 1b of the hand-shaped slave device 1 is operated to make, the grip / call switch element 1Sa or the call switch element 1Sb becomes conductive, 4mA for line L
Flows. Therefore, if 4 mA is measured in the current measuring unit 3Sb of the corridor lamp 3, it is detected that the make / call button 1a or the calling button 1b has been operated, and a call detection signal is output from the current measuring unit 3Sb to the CPU. ,
A calling operation is performed by the CPU, and a calling display is performed on the operation display unit 3b of the corridor lamp 3. Further, when there is no disconnection or disconnection of the hand type slave unit 1 and the stuff call button 2a of the outlet 2 is operated, the stuff call switch element 2Sa is turned on, and 5 mA flows through the line L.
Therefore, in the current measuring unit 3Sb of the corridor lamp 3, 5 mA
Is measured, it is detected that the staff call button 2a has been operated to make up, a stuff call detection signal is output from the current measuring unit 3Sb to the CPU, a calling operation is performed by the CPU, and the operation display unit of the corridor lamp 3 is operated. A staff call is displayed at 3b. In addition, dropping of the hand-held slave unit 1,
When the restoration button 2b of the outlet 2 is operated when there is no disconnection, the restoration switch element 2Sb is turned on,
7 mA flows through the line L. Therefore, if 7 mA is measured in the current measuring unit 3Sb of the corridor lamp 3, it is detected that the restoration button 2b has been operated to make up, a restoration detection signal is output from the current measuring unit 3Sb to the CPU, and the CPU performs the restoration operation. Is performed, and the display on the operation display unit 3b of the hallway light 3 is deleted. Similarly, when the toilet call button 2c of the outlet 2 is operated when there is no disconnection or disconnection of the hand-type handset 1, the toilet call switch element 2Sc is turned on, and 11 mA flows through the line L. Therefore, if 11 mA is measured in the current measuring unit 3Sb of the corridor light 3, it is detected that the toilet call button 2c has been made, and a toilet call detection signal is output from the current measuring unit 3Sb to C.
The signal is output to the PU, the toilet is called by the CPU, and the toilet display is displayed on the operation display unit 3b of the corridor light 3.

The present invention is not limited to the above embodiment, but may be set to a predetermined current value using a predetermined resistance element instead of the constant current elements 11a, 12a, 12b and 12c. Further, the switch operation detection device of the present application is not limited to a nurse call course system, but can be suitably applied to a system including a plurality of switches.

[0022]

As is apparent from the above description, according to the switch operation detecting device of the present invention, a plurality of switch circuits are provided with a constant current element set to a different current value corresponding to each switch circuit. Since the switch circuit is provided in series and connected in parallel to the power supply unit, it is possible to detect a switch circuit that has been made conductive by the make operation by measuring the current value flowing through the entire circuit. Therefore, regardless of the number of switch circuits, two wires are used for switch detection.
It can be used as a book, and it is possible to reduce the number of wires and improve the workability.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a switch operation detection device of the present invention.

FIG. 2 is a block diagram showing one embodiment of a switch operation detection device of the present invention.

FIG. 3 is a configuration diagram showing a conventional switch operation detection device.

FIG. 4 is a block diagram showing a conventional switch operation detection device.

[Explanation of symbols]

1Sa, 1Sb, 2Sa, 2Sb, 2Sc ··· switch elements 11a, 12a, 12b, 12c ··· constant current element _{S 0, S 1, S 2} , S 3 ··· switching circuit 3Sa · · · Power unit 3Sb ... Current measurement unit

Claims (4)

[Claims] A plurality of constant current elements (11a, 11b, 11);
c, 11d,...), switch circuits (S ₀ , S ₁ , S ₂ , S ₃ ,...) each connected in series to the constant current element, and a parallel circuit in each of a series circuit of the constant current element and the switch circuit. A switch operation detection device including a connected power supply unit (3Sa) and a current measurement unit (3Sb) for measuring a current value flowing from the power supply unit to the entire circuit, wherein the constant current element has a current value of A switch operation detecting device, wherein the operated switch circuit is specified from the current value detected by the current measuring unit by using one set to a different value. 2. The constant current element has a current value
The switch circuit operated is specified from the current value detected by the current measuring unit by using the one set to 2 ⁿ (n = 0, 1, 2, 3,...). The switch operation detecting device according to claim 1, wherein 3. The switch circuit according to claim 1, wherein the switch circuit comprises one or a plurality of switch elements (1Sa, 1Sb, 2Sa, 2Sb, 2S
2. The switch operation detecting device according to claim 1, further comprising: c). 4. The switch operation detecting device according to claim 3, wherein the switch circuit connects the switch elements in parallel.