JP2850379B2 - Electronic switch - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to electronic switches such as pressure sensors and distance sensors.

[Conventional technology]

In a conventional electronic switch such as a pressure sensor having a pressure sensor and outputting an on / off signal based on a pressure introduced at a predetermined set value, a display unit 101 for displaying a pressure obtained from the sensor unit as shown in FIG. A variable resistor 102 for setting a threshold value for discriminating the output with a predetermined threshold value, a changeover switch 103 for displaying ON / OFF and the like, and an operation indicator lamp 104 are provided on the side surface.

When the display function is integrated with the electronic switch in this way,
The pressure of the supplied fluid can always be confirmed on the display unit. However, the display on the display unit is used only at the time of setting the threshold value and is not usually used in a normal case, and there is a disadvantage that the price increases due to the provision of the display unit. Therefore, an electronic switch in which the display unit is detachable has been proposed.

[Problems to be solved by the invention]

In such a conventional display-integrated electronic switch or an electronic switch having a detachable display unit, the display unit can be connected to the sensor body only when necessary. However, the electronic switch may be provided at a position where it is difficult to visually recognize the display. In such a case, there is a disadvantage that the set value cannot be sufficiently recognized even if the display unit is detachable.

The present invention has been made in view of the above-described problems of the conventional electronic switch, and has as its technical object to be able to confirm a display at a position away from the switch body and to set sensitivity. .

[Means for solving the problem]

The present invention is an electronic switch in which a display unit is separated, a sensor unit, a switch circuit unit that discriminates a detection signal obtained from the sensor unit with a predetermined threshold, a first threshold setting unit that sets a threshold of the switch circuit unit, Switching means for selectively switching the set value of the first threshold setting unit and an externally applied threshold setting signal; a connector having a terminal for outputting a detection signal obtained from the sensor unit and receiving the threshold setting signal; An electronic switch main body, a display unit that is detachably connected to a connector of the electronic switch main body through a cord, displays a detection signal of the electronic switch main body, and a second unit that sets a threshold value.
And a remote connection unit having a threshold setting unit.

[Action]

According to the present invention having such characteristics, the switch body of the electronic switch is obtained from the first threshold setting unit and the second threshold setting unit in the main body in addition to the sensor unit and the first threshold setting unit. Switching means for selectively selecting a signal is provided, so that a remote connection unit can be detachably connected to a terminal portion of the electronic switch. When the remote connection unit is connected, the output state of the sensor unit can be displayed on the display unit, and the position is set by the second threshold value setting unit.

〔The invention's effect〕

Therefore, according to the present invention, even when the display unit is directly attached and the display of the electronic switch is placed at a position where it is difficult to confirm the display, the remote connection unit is connected to the electronic switch body via the cord and placed at an arbitrary position. By doing so, it is possible to obtain an effect that a threshold value can be set and an operation state can be confirmed. Further, since the display unit can be provided at an arbitrary position, the sensor main body can be arranged at an optimum position where measurement is necessary, and the response speed and the detection accuracy can be prevented from lowering.

[Explanation of Example]

FIG. 1 is a perspective view showing an example of a pressure sensor according to an embodiment of the present invention, and FIG. 2 is a diagram showing a state of attachment of a sensor main body and a display unit of the pressure sensor of the embodiment. FIG. 3 is a diagram showing each block of this embodiment. As shown in these drawings, the electronic switch of the present invention is configured such that a sensor main body 1 and a display unit 11 described later are separated. As shown in FIG. 1, the sensor body 1 is provided with a U-shaped notch, and has a sensor unit 3 for detecting a pressure applied through a pressure introducing pipe 2, and its output is a measured value output. It is output as an analog value via the circuit 4. This signal is sent to the sensor body 1
The signal is output to the outside via the code 5 as a more linear output, and is also supplied to the on / off output circuit 6 at the same time. The on / off output circuit 6 is supplied with the linear output and the reference signal from the multiplexer 7, and switches the linear output from the set value output circuit 4 at a predetermined pressure value to output it as a binary signal to the outside. It is a circuit part. A first threshold value setting circuit 8 including a variable resistor VR1 for setting a threshold value of an on / off output circuit 6 is provided in the sensor main body 1, and the threshold value is given to one input terminal of a multiplexer 7. The sensor body 1 is provided with a connector 9 for making the display unit detachable. The terminal 9a of the connector 9 is a power output terminal, 9b is a linear output terminal, 9c is a threshold output terminal, 9d is a threshold input terminal, 9e is a control input terminal of the multiplexer 7, and 9f is a ground terminal. A threshold value is given to the other input terminal of the multiplexer 7 via a terminal 9d of the connector 9, and a control signal is sent from the connector 9 via a terminal 9e to the multiplexer 7.
Given to. The multiplexer 7 constitutes switching means for switching the threshold set by the threshold setting circuit 8 and the threshold given from the terminal 9d based on the control signal.

Now, as shown in FIG.
However, instead of the display unit 11, the connection unit 13 of the remote connection unit 12 is detachably connected. The display unit 11 has a connector 20 connected to terminals 9a to 9c, 9e, 9f of the connector 9 as shown in FIG. 4, and the terminals 20b, 20c of the connector 20 are input to the display mode switching circuit 21, respectively. Given as The terminal 20a of the connector 20 is supplied as a power to each part of the display unit 11, and is directly connected to the terminal 20e. Terminal 20f is the display unit 11.
Connected to the ground end of the The display mode switching circuit 21 selects one of the inputs, that is, the linear output of the measured value output circuit 4 and the threshold output of the multiplexer 7 by a switch 22, and the output is supplied to a DC / DC conversion circuit 23. The DC / DC conversion circuit 23 converts the DC voltage to a displayable level, and its output is given to the A / D converter 24. The A / D converter 24 converts this signal into a digital signal, and is displayed by the display 26 via the LCD driver 25. When the display unit 11 is directly connected to the sensor body 1, the connector 9 of the sensor body
Terminal 9e is supplied with the same voltage level as the power supply,
The multiplexer 7 selects the output of the threshold value setting circuit 8 as a threshold value and supplies it to the on / off output circuit 6, and the terminal 9c
Output to

When the display unit 11 is not directly connected to the sensor body 1 and the display is confirmed at a position distant from the sensor body 1, a remote connection unit 12 is connected to the sensor body 1 instead of the display unit 11. As shown in FIG. 1, the remote connection unit 12 comprises a connection portion 13 mounted on the connector 9, a cable 14, and a display-side socket 15, and a terminal 9a of the connector 9 is provided.
9c and 9f are used as extension cables for connecting the terminals of the connector 20 of the display unit 11. The display-side socket 15 is formed with a recess for mounting the above-described display unit 11 therein, and FIG. 1 is a diagram showing a state where the display unit 11 is mounted in the display-side socket 15. Also remote connection unit
As shown in FIG. 3A, a second threshold value setting circuit 16 including a variable resistor VR2 is provided in the 12 display side sockets 15. The threshold set by the threshold setting circuit 16 is the connector 9
Is supplied to the other input terminal of the multiplexer 7 through the terminal 9d. In the connection section 13, the terminal 9e is grounded.
Therefore, when the remote connection unit 12 is connected, the control input terminal of the multiplexer 7 is grounded via the terminal 9e.
The signal applied to the second input of the multiplexer 7, the threshold of the remote connection unit 12, is selected. Therefore, the threshold value of the sensor main body 1 can be changed by changing the setting variable resistor VR2 of the display side socket 15. The threshold can be displayed on the display 26 by switching the display with the switch 22. When the setting is completed, the output of the measured value output circuit 4 can be displayed by switching the switch 22 to the linear output side.

If the display unit 11 is not separated, a cover 17 having substantially the same shape as the display unit is attached to the sensor body 1. cover
Reference numeral 17 denotes terminals 9a and 9e of the socket 9 as shown in FIG.
And only the connection line 18 for short-circuiting the. So cover
When the switch 17 is connected, the power supply voltage is applied to the control input terminal of the multiplexer 7 as it is, and the set value of the threshold value setting circuit 8 is given to the on / off output circuit 6 in the sensor main body 1.

As described above, in the present invention, the cover 17 can be attached to the sensor main body 1 or the display unit 11 can be attached. Then, instead of these, the remote connection unit 12 is attached, and the cable 14
The display unit 11 can be installed at an arbitrary position away from the sensor main body 1 via the, and a threshold value and an output value at that time can be displayed.

Although the present embodiment has been described by taking a pressure sensor as an example, the present invention relates to various electronic switches that display an analog signal obtained from the sensor main body and output a binary signal discriminated by a predetermined threshold, such as an ultrasonic sensor. And a distance sensor, a linear output type proximity sensor, and the like.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a remote connection unit is attached to an electronic switch according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state where a display unit is attached to a sensor body, and FIG.
3A is a block diagram showing a cover attached to a sensor main body, FIG. 3 is a block diagram showing a configuration of a display unit, and FIG. It is a perspective view showing an example of a switch. DESCRIPTION OF SYMBOLS 1 ... Sensor body, 4 ... Measurement value output circuit, 6 ... On / off output circuit, 7 ... Mux, 8 ... Threshold setting circuit, 9,20 ... Connector, 11 ... Display part, 12 ... … Remote connection unit, 13… Connection part, 15… Display side socket

Continuation of front page (56) References JP-A-61-53823 (JP, A) JP-A-58-65426 (JP, A) JP-A-63-301611 (JP, A) JP-A-1-143520 (JP) , A) Japanese Utility Model Showa 64-3332 (JP, U) Japanese Utility Model Showa 61-100046 (JP, U) Japanese Utility Model Showa 63-102331 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB Name) H03K 17/00-17/70 H01H 35/26

Claims (1)

(57) [Claims] 1. A sensor section, a switch circuit section for discriminating a detection signal obtained from the sensor section with a predetermined threshold, a first threshold setting section for setting a threshold of the switch circuit section, and the first threshold setting section An electronic switch body having a switching means for selectively switching between a set value and an externally applied threshold setting signal, a connector having a terminal for outputting a detection signal obtained from the sensor unit and receiving a threshold setting signal, A remote connection unit that is detachably connected to a connector of the electronic switch body via a cord and that displays a detection signal of the electronic switch body and a second threshold setting section that sets a threshold. An electronic switch, comprising: