JP2913595B2 - Method of manufacturing detection switch and detection switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object detection signal output from detection means in the presence of an object to be detected.
About detection switch so as to output the control means set the output signal in accordance with the output mode.

[0002]

2. Description of the Related Art A photoelectric switch, which is a kind of a detection switch, is constituted by a combination of a light emitter and a light receiver, and has a function of outputting an object detection signal corresponding to the detection of the light receiver as an output signal. Some of such detection switches are provided with various switching functions and adjustment functions as necessary according to the detection target, installation conditions, and the like.

For example, the switching function includes a switching function of a detection output mode, a switching function of a detection output delay mode, a switching function of an external synchronization mode, and a switching function of a projection frequency. It has a function, a detection hysteresis adjustment function, a detection output delay time adjustment function, a detection sensitivity fine adjustment function, etc., and a switch and an adjuster are provided on the detection switch body so that these can be switched and adjusted. I have.

[0004]

By the way, the detection switch such as the photoelectric switch is formed as small as possible so that it can be arranged at an appropriate position in accordance with the installation place and environment. Is required. Accordingly, the main body case is provided with a space for disposing minimum necessary switches and variable resistors for adjustment.

On the other hand, in the photoelectric switch as described above, for example, a changeover switch is provided corresponding to a changeover function.
Since a variable resistor or the like is provided corresponding to the adjustment function, the following functions are required for manufacturing the main body case in order to provide various functions required of the switching function and the adjustment function as described above. The following problems have occurred.

That is, for example, when two kinds of functions are provided from the switching function and the adjusting function, two switching switches are provided depending on whether a switching switch or a variable resistor is provided in the main body case. , Two variable resistors, or one changeover switch and one variable resistor. Therefore, since it is necessary to manufacture the main body case by providing a structure for disposing the changeover switch and the variable resistor, it is necessary to manufacture three types of main body cases, which increases the manufacturing cost and the management cost thereof. In addition, since it is necessary to distinguish the changeover switch and the variable resistor attached to the main body case at the time of assembling according to the product, there is a problem that the workability is reduced.

To solve such a problem, for example,
A space is provided in the body case in advance to provide two changeover switches and two variable resistors, and at the time of manufacture, only switches or variable resistors required for the photoelectric switch are provided and used. It is conceivable to cover and hide portions not to be covered with a cover or the like.

Thus, a single type of main body case can be used without having to individually manufacture a plurality of types of main body cases to have various functions. However, in this case, it is necessary to provide a space for a switch or a variable resistor that is not used. Therefore, there is a problem that a useless space is generated in the main body case and the entire device cannot be reduced in size.

Further, such a situation occurs not only when two types of functions are provided but also when one type of function is provided, and similarly when three or more types of functions are provided. That is, there is a situation where the types of main body cases to be manufactured increase as the functions to be provided increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the size of a device when it has various switching and adjustment functions for setting operating conditions and the like. while, moreover there is no need to prepare a plurality of the main body case in correspondence with the respective configuration, reduce the reduction and management costs fabrication overall cost, workability also detection obtained Ru aim improved during assembly To provide the switch.

[0011]

A detection switch according to the present invention .
Has a main body case, and the detected object is in the main body case.
The object detection signal output from the detection means in the presence state
A detection switch having control means for performing a detection operation based on the
Switch, and the body case
A plurality of variable resistors operably provided from the control means
For each of the plurality of variable resistors,
The level of the input signal based on the resistance of the variable resistor
Switching device that switches the detection operation depending on whether it is within the enclosure
And the input signal level based on the resistance of the variable resistor.
One of the adjustment functions to adjust the detection operation according to the bell
It is characterized in that it is configured to select and set . Further, the detection switch of the present invention is a detection switch having a control means for performing a detection operation based on an object detection signal output from the detection means in a state where a detected object is present, wherein the variable resistor is provided, the control means, the variable resistor of resistance to at least one of said plurality of variable resistors
Selecting and setting a switching function for switching the detection operation according to whether the level of the input signal based on the value is within a predetermined range,
The feature that the switching function is not set is that the adjustment function for adjusting the detection operation is selectively set according to the level of the input signal based on the resistance value of the variable resistor. Further, the detection switch of the present invention is a detection switch having a control means for performing a detection operation based on an object detection signal output from the detection means in a state where the detected object is present, wherein Are provided, and the control means includes:
For at least one of the plurality of variable resistors, an input signal level based on a resistance value of the variable resistor is
It is selectively set so as to have both a switching function for switching the detection operation according to whether or not it is within a predetermined range and an adjustment function for adjusting the detection operation according to the level of the input signal based on the resistance value of the variable resistor. The remaining variable resistors are characterized in that one of the switching function and the adjustment function is selectively set.

According to the detection switch of the present invention, the variable resistor
Control, if the device is provided with a switching function
Means for input signal level based on the resistance of the variable resistor.
Depending on whether the bell is within a preset range
Selective setting to have a switching function to switch the detection operation
If the variable resistor is provided so as to have an adjustment function,
In the case, the control means, based on the resistance value of the variable resistor
Adjust so that the detection operation is adjusted according to the level of the input signal.
Select and set the adjustment function. By this, the main body case, manufacturing the need to provide and changeover switches or regulators separately without a corresponding if so constructed to mount the variable resistor in each case in accordance with the function of it is intended to create Can be used, the main body case can be shared, and the cost can be reduced.
At the same time, the same as providing multiple variable resistors in appearance
Switching function and adjustment function while keeping the main body case shaped
Can be obtained in different numbers . Further, the detection switch of the present invention can be configured to have a switching function by the variable resistor while providing two or more variable resistors,
As a result, there is no need to provide a switch arrangement portion for giving the switching function to the main body case,
The main body case can be shared. Furthermore, the detection switch of the present invention can be configured to have a composite function having both a switching function and an adjustment function by using the variable resistor, while having a configuration in which two or more variable resistors are provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, as an embodiment in which the present invention is applied to a reflection type photoelectric switch, two variable resistors are provided.
The case will be described with reference to the drawings corresponding to the embodiments of the photoelectric switch having various functions . FIGS. 1 and 2 show the basic configuration of the present embodiment. In FIG. 1 showing the appearance of a photoelectric switch 1, an optical fiber cable for projecting light and receiving light from a front portion is provided in a main body case 2 having a rectangular shape. 3,
4 are led out, and they are collectively arranged in a detection part (not shown). A cable 5 in which a power cable, a signal output cable, and the like are grouped is led out from a rear portion of the main body case 2.

On the upper surface 2a of the main body case 2,
LEDs 6 and 7 for display are provided, and first and second variable resistors 8 and 9 are provided. The display elements 6 and 7 and the variable resistors 8 and 9 are provided on the upper surface 2a.
A nameplate 10 provided with an opening at a portion corresponding to the portion is attached, and a light-transmitting case cover 11 covering the entire upper surface portion 2a is attached.

In FIG. 2 showing an electrical configuration, a microcomputer 12 is a so-called one-chip microcomputer including a CPU, a ROM, a RAM, an A / D converter, and the like, and internally performs a detection operation. Is stored, and functions as control means.

The light projecting circuit 13 is composed of a series circuit of an LED (light emitting diode) 14 having an illustrated polarity, an npn transistor 15 and a resistor 16, and a DC power supply terminal VD (for example, the power supply voltage is assumed to be 5V). ) And ground. The base of the transistor 15 is connected to the output terminal A of the microcomputer 12.

The light receiving circuit 17 is composed of a series circuit of a photodiode 18 and a resistor 19, and is connected between the DC power supply terminal VD and the ground. The common connection point between the photodiode 18 and the resistor 19 is connected to the input terminal B of the microcomputer 12 via the amplifier circuit 20. NPN transistor 21 for output
Are used as open collectors. The collector is connected to the output terminal P, the emitter is grounded, and the base is connected to the output terminal C of the microcomputer 12.

The first and second variable resistors 8 and 9 each have one fixed terminal 8a, 9a connected to the DC power supply terminal VD, the other fixed terminal 8b, 9b grounded, and a variable output terminal. 8c and 9c are connected to input terminals D and E of the microcomputer 12, respectively. The above electrical configuration is housed inside the main body case 2.

In the basic configuration described above, a program is stored in the microcomputer 12 in advance so as to have functions corresponding to each of the following three modes. When the first and second variable resistors 8 and 9 function as switches having a switching function as an embodiment, (2) the first and second variable resistors 8 and 9 are switched as a second embodiment, respectively. (3) A third embodiment in which the first and second variable resistors 8 and 9 function as an adjuster having an adjusting function. I will explain separately.

(1) First Embodiment In this embodiment, for example, a configuration having a switching function of a detection mode and a switching function of an external synchronization mode as the switching function is shown in FIGS. I will explain. As the detection mode switching function, light ON
The setting for switching between the detection mode and the dark ON detection mode is performed. In the external synchronization mode, a detection operation is performed based on an external synchronization signal externally applied to the input terminal F of the microcomputer 12, and the switching function of the external synchronization mode includes a period synchronization mode, a differential synchronization mode, and a period synchronization mode. Is set.

In this case, when the detection mode is set to the light ON detection mode, the output is turned on when light is detected, and the output is turned off when light is not detected. When the detection mode is set to the dark ON detection mode, the light is not detected. The detection operation is performed so that the output is sometimes turned on and the output is turned off when the light is detected. Such a function is switched and set by the user according to the installation location and the condition of the detected object.

When the external synchronization mode is set to the period synchronization mode, light detection during the period when the external synchronization signal is being input is enabled. The detection operation is performed so as to enable the light detection for a predetermined time from.

In this case, the period synchronization mode is, for example,
A signal indicating the existence period of the detection target detected by another optical sensor or the like is received as a synchronization signal, and a detection operation for detecting the presence or absence of a mark or an object provided on the detection target in the presence state of the detection target is performed. That's what I'm trying to do. Also,
Differential synchronization mode is a method in which the arrival at a predetermined position of an object to be detected is detected by another sensor, the signal is received as a synchronization signal, and provided at a predetermined position of the detection target at the timing of receiving the synchronization signal. It is intended to perform a detection operation for detecting the presence or absence of a mark, an object, or the like.

FIG. 3 shows the operation dials 22 of the first and second variable resistors 8 and 9, of which the rotatable angle range of 0 ° to 240 ° is an angle range of 0 ° or more and less than 120 °. An area A is defined as an area A, and an angle range between 120 ° and 240 ° is defined as an area B. In this case, the first variable resistor 8 is used for switching the detection mode,
The area A corresponds to the setting area of the light ON detection mode, the area B corresponds to the setting area of the dark ON detection mode, and the second variable resistor 9 is used for switching the external synchronization mode. The area A of the dial 22 corresponds to the setting area of the period synchronization mode, and the area B corresponds to the setting area of the differential synchronization mode.

Next, the operation of the present embodiment will be described with reference to FIGS. First, when the user turns the operation dials 22 and 22 of the first and second variable resistors 8 and 9 to desired setting positions, the input terminals D and E of the microcomputer 12 have their rotation angles. Voltage signal corresponding to the variable output terminal 8c or 9
c.

In this case, since the DC power supply voltage is set to 5 V, 0 V is set when the rotation angle of each of the variable resistors 8 and 9 is set within the range A of 0 ° or more and less than 120 °.
And a voltage value of less than 2.5 V and a rotation angle of 120 °
When it is set within the region B of not less than 240 ° and not more than 240 °, the voltage value is not less than 2.5V and not more than 5V.

The microcomputer 12 A / D-converts a voltage signal in the range of 0 V to 5 V input from the variable resistors 8 and 9 with a built-in A / D conversion function at 8-bit resolution, and A digital value in a range from "0" to "255" is input. Therefore, when the operation dials 22, 22 of the variable resistors 8, 9 are set in the area A, the value changes from "0" to "127".
When the digital value is set in the area B, a digital value in a range from “128” to “255” is input.

Now, the microcomputer 12 will be described with reference to FIG.
When the detection program shown in (1) is started, first, a setting routine is executed in step A1 to perform each setting operation of the detection mode and the external synchronization mode set by the first and second variable resistors 8 and 9. Become.

The setting routine A1 is constituted by a program as shown in FIG. 5, and the microcomputer 12 converts the digital signal of the voltage signal inputted from the first variable resistor 8 to the input terminal D in step B1. Enter a value,
At step B2, it is determined whether or not the digital value is "128" or more. The digital value changes from "0" to "12".
If the value is within the range of “7”, that is, the value within the area A, the microcomputer 12 determines “NO” in step B2 and proceeds to step B3 to set the light ON detection mode. Also, the digital value is changed from “128” to “255”.
Is within the range B, that is, the value in the area B, the microcomputer 12 determines “YES” in step B2 and proceeds to step B4 to set the dark ON detection mode.

Thereafter, the microcomputer 12 proceeds to step B5, inputs the digital value of the voltage signal input from the second variable resistor 9, and in step B6, the digital value is "128" or more. It is determined whether or not.
The digital value is in the range of “0” to “127”, that is, the area A
When the microcomputer 12 has the value of
In step B6, "NO" is determined, and the process proceeds to step B7 to set the period synchronization mode. When the digital value is in the range of “128” to “255”, that is, the value in the area B, the microcomputer 12 determines “YES” in step B6 and proceeds to step B8 to set the differential synchronization mode. Do.

Here, the case where the detection mode is set to the light ON mode and the external synchronization mode is set to the period synchronization mode in the above setting routine will be described first.

That is, the microcomputer 12
When step B8 of the setting routine ends, the process returns to the detection program and proceeds to step A2, where the light projection operation is performed. In this case, the microcomputer 12
Outputs one light emission pulse from the output terminal A as a light emission operation, turns on the transistor 15 and energizes the LED 14 to light it. Thereby, the pulse light is output toward the detection area.

Next, in step A3, the microcomputer 12 receives the reflected light from within the detection area by the photodiode 18 and inputs the received light signal amplified by the amplifier circuit 20 from the input terminal B. A / A
The data is converted into a digital value by the D conversion function and input to the CPU. At this time, for example, the object T
Exists, the pulse light is reflected by the object T, and a light receiving signal corresponding to the intensity of the reflected light at that time is converted into a digital value and input. When the microcomputer 12 proceeds to step A4, the microcomputer 12 determines whether the digital value corresponding to the light receiving signal is greater than the value of the reference level, thereby detecting the presence or absence of the object.

When the reflected light is not incident, the microcomputer 12 proceeds to step A5,
Here, since it is not the setting state of the dark ON detection mode, it is determined to be "NO", and the process proceeds to step A6, where the output is turned off, that is, the output stop state is maintained, and the process returns to step A1.

Thereafter, when the microcomputer 12 receives the light receiving signal indicating the light incident state, the microcomputer 12 determines "YES" in step A4 and proceeds to step A7, where the microcomputer 12 is again set to the light ON detection mode. Is determined to be "YES" and the process proceeds to step A8.
Then, in step A8, the microcomputer 12
Is set to the period synchronization mode.
S ”and proceeds to step A9, where it is determined whether or not the external synchronization signal input from the input terminal F is at“ H ”level. If“ YES ”, step A10
Then, the output is turned on, an output signal is supplied to the output transistor 21, and the process returns to step A1.

Thereafter, the microcomputer 21 determines in step A that the reflected light from the object T in the detection area has disappeared.
If "NO" is determined in step 9, the process proceeds to step A6, in which the output is turned off, that is, the output transistor 21 is turned off. Accordingly, in a state where the object T is present in the detection area and the light receiving signal is being input, the microcomputer 12 outputs the detection signal as the detection signal to the output terminal P during the period in which the external synchronization signal is input. An "L" level signal is output.

Next, when the external synchronization detection mode is set to the differential synchronization mode in the above case, the microcomputer 12 determines "NO" in step A8 and shifts to step A11. , Step A12
When the external synchronization signal applied to the input terminal F via the input terminal A and the input terminal F is detected at the time when the external synchronization signal rises from the "L" level to the "H" level, the process proceeds to a step A13 to start the timer. It turns on (steps A14 and A15), resets the timer (step A16), and turns off the output (step A16).
6) Then, the process returns to step A1.

When the detection mode is set to the dark ON detection mode, the microcomputer 12
Is determined to be "YES" in step A5, and the process proceeds to step A8.
In step 9, the determination is "YES" and the process proceeds to step A10. In other steps, the processing is executed in the same manner as described above. Thus, the output transistor 21 is operated such that the output state in the light ON detection mode and the output state of ON / OFF are reversed.

(2) Second Embodiment Next, as a second embodiment, a configuration having a function of switching the detection mode and a function of adjusting the detection sensitivity will be described with reference to FIGS. 6 and 7. explain. The function of switching the detection mode is similar to that of the first embodiment.
The setting for switching between the N detection mode and the dark ON detection mode is performed. The sensitivity adjustment function adjusts a detection level to be compared with the level of the light receiving signal in the microcomputer 12 to determine the detection of an object.

In this case, in setting the detection level in the object detection operation, a predetermined hysteresis width (for example, 10% of the detection level) is set as a hysteresis function. When the level is higher than the ON point detection level, the state shifts to the detection state. In the detection state, non-detection is performed when the level of the detection signal becomes lower than the OFF point detection level lower than the ON point detection level by a hysteresis width. State. The reason for providing the hysteresis function is to prevent erroneous detection due to chattering or the like even in a light incident state near the detection level.

The first variable resistor 8 has a rotatable angle range of the operation dial 22 divided into a region A and a region B in the same manner as in the first embodiment. Thus, the detection mode is set corresponding to the area A or B set by the operation dial 22. On the other hand, the second variable resistor 9 sets the detection sensitivity according to the rotation angle of the operation dial 22, and the microcomputer 12 sets the detection level and its hysteresis width according to the rotation angle of the operation dial 22. It has become.

Next, the operation of the present embodiment will be described with reference to FIGS. First, when the user turns the operation dials 22, 22 of the first and second variable resistors 8 and 9 to a desired set position, the microcomputer 12 operates in the same manner as in the first embodiment. Then, digital values corresponding to the rotation angles are input.

When the microcomputer 12 starts the detection program shown in FIG. 6, the microcomputer 12 first executes a setting routine in step C1 to execute the variable resistors 8 and 9.
Then, the setting of the detection mode and the setting operation of the detection level are performed. This setting routine C1 corresponds to FIG.
The microcomputer 12 executes steps D1 to D4 and performs the light ON detection mode or the dark ON detection in the same manner as in steps B1 to B4 of the setting routine shown in FIG. One of the modes will be set.

Subsequently, the microcomputer 12 inputs the digital value Q of the voltage signal input from the second variable resistor 9 to the input terminal E in step D5, and in step D6, the digital value Q , An ON point detection level Lon and an OFF point detection level Loff that allow for a hysteresis width of 10% are calculated by a predetermined calculation program.

In this case, the input digital value Q corresponds to the center value of the detection level, and the ON point detection level Lon and the OFF point detection level Loff to be set have a width of 5% above and below this center value. The digital value Q is, for example, set to an ON point detection level Lon and an OFF point detection level Loff
Is calculated according to the following equation.

Lon = 1.05Q (1) Loff = 0.95Q (2)

In step D7, the microcomputer 12 stores and sets the ON point detection level Lon and the OFF point detection level Loff obtained by the above calculation in the RAM, and returns to the detection program. As a result, a detection level having a hysteresis width of 10% around the input digital value Q is set.

The microcomputer 12 executes the light projection operation and the light reception signal input operation through steps C2 and C3 of the detection program, and shifts to step C4. In the setting routine described above, for example, when the light ON detection mode is set, the microcomputer 12 proceeds to step C5, and determines whether or not the output is in the off state, that is, whether or not the output is in the undetected state. In this case, since the output signal has not been given to the transistor 21 yet, it is determined “NO” and the step C
The process moves to 6.

If the level of the light receiving signal has not reached the ON point detection level set as described above, the microcomputer 12 sets "N" in step C6.
O ”is determined, the process proceeds to step C7, the output is turned off, that is, the output is stopped, and if the ON point detection level or higher is reached,“ YES ”is determined in step C6 and the process proceeds to step C8. Turn on the output and turn on transistor 21
Is turned on to return to step C1.

Thereafter, at step C5 after steps C1 to C4, the microcomputer 12 determines "NO" because the output is in the ON state, and proceeds to step C9, where the level of the detection signal is determined. Is O
Judge whether it has dropped below the FF point detection level,
In the case of "NO", the output is kept on (step C
8) When it is determined to be "YES", the process proceeds to step C7 to turn off the output, and thereafter returns to step C1.

On the other hand, when the dark ON detection mode is set in the setting routine, the microcomputer 12
Determines “NO” in step C4 and returns to step C1
It shifts to 0. Then, when the detection signal from the object T is not incident on the microcomputer 12 in the non-detection state, the microcomputer 12 goes through steps C10 and C11,
First, in step C12, the output is turned on, and then in step C10, "YES" is determined and step C13 is executed.
It will come to.

If the level of the detection signal has not reached the ON point detection level or more, the microcomputer 12
Determines "NO" in step C13 and keeps the output on (step C12), and when the output level exceeds the ON point detection level, determines "YES" in step C13 and proceeds to step C7.
And the output is turned off. Then, after this, through steps C1 to C4 and C10, C11
When the detection signal level becomes equal to or lower than the OFF point detection level, the process again proceeds to step C12 to change the output to the ON state.

(3) Third Embodiment Next, as a third embodiment, a configuration having a detection sensitivity adjustment function and a detection hysteresis width adjustment function will be described with reference to FIGS. 8 and 9. FIG. Will be explained. The detection sensitivity adjustment function adjusts the detection level to be compared with the level of the received light signal in the microcomputer 12 in order to determine the detection of the object in the same manner as in the second embodiment. The adjustment function of the second
In this embodiment, the hysteresis width can be adjusted, while the constant hysteresis width is set to 10%.

The first and second variable resistors 8 and 9 are for setting the detection sensitivity or the detection hysteresis width according to the rotation angle of the operation dial 22, and the microcomputer 12 controls the rotation angle of the operation dial 22 by the microcomputer 12. The detection level and its hysteresis width are set accordingly.

Next, the operation of the present embodiment will be described with reference to FIGS. First, when the user turns the operation dials 22, 22 of the first and second variable resistors 8 and 9 to a desired set position, the microcomputer 12 operates in the same manner as in the first embodiment. Then, digital values corresponding to the rotation angles are input.

When the microcomputer 12 starts the detection program shown in FIG. 8, the microcomputer 12 first executes a setting routine in step E1 to execute the variable resistors 8, 9
Thus, the operation of setting the detection level and the operation of setting the detection hysteresis width are performed.

The setting routine E1 is composed of a program as shown in FIG. 9, and the microcomputer 12 performs the first and second steps in steps F1 and F2.
Digital values Q1 and Q2 of the voltage signals input from the variable resistors 8 and 9 to the input terminals D and E,
In step F3, based on the digital value, the ON point detection level Lon and the OFF point detection level Loff are calculated by a predetermined calculation program.

In this case, the input digital value Q1 corresponds to the center value of the detection level, and the digital value Q2 corresponds to the detection hysteresis width. And, for example, ON
The point detection level Lon and the OFF point detection level Loff are calculated according to the following equation. The setting range of the detection hysteresis width is in a range from 5% to 20% with respect to the detection level, and is set within the range corresponding to the digital value Q2.

Since the digital value Q2 ranges from "0" to "255", the ON point detection level L
The on and OFF point detection levels Loff are in the range of 5% to 20% of the detection level value, that is, ±.
The value may be set so as to change from a value of 2.5% to a value of ± 10%.

Lon = (1.025 + 0.075 × Q2 / 255) × Q1 (3) Loff = (0.975 + 0.075 × Q2 / 255) × Q1 (4)

Then, in step F4, the microcomputer 12 stores and sets the ON point detection level Lon and the OFF point detection level Loff obtained by the above calculation in the RAM, and returns to the detection program. As a result, the detection level having the detection hysteresis width Q2 set in the range of 5% to 20% around the input digital value Q1 is set.

The microcomputer 12 executes the light projecting operation and the light receiving signal input operation through steps E2 and E3 of the detection program, and shifts to step E4. The microcomputer 12 determines whether or not the output is in the off state, that is, whether or not the output is in the undetected state in step E4. Here, since the output signal has not been supplied to the transistor 21, "NO" is returned. Then, the process proceeds to step E5.

When the level of the light receiving signal has not reached the ON point detection level set as described above, the microcomputer 12 determines "NO" in step E5 and shifts to step E6 to turn off the output. If the output is stopped and the ON point detection level or more is reached, “YES” is determined in the step E5 and the step E5 is performed.
In step 7, the output is turned on to turn on the transistor 21, and the process returns to step E1.

Thereafter, at step E4 after steps E1 to E3, the microcomputer 12 determines "NO" because the output is on, and proceeds to step E8, where the level of the detection signal is set. Is O
Judge whether it has dropped below the FF point detection level,
If "NO", the output is kept on (step E
7) When it is determined to be "YES", the process proceeds to step E6 to turn off the output, and thereafter returns to step E1.

(4) Fourth Embodiment Next, in a fourth embodiment, a switching function of the light emission frequency is replaced with one of the switching functions shown in the first and second embodiments. The case of providing will be described with reference to FIG. As a function of switching the light emission frequency, in the light emission operation performed in each of the above-described detection programs, the output frequency of the light emission signal output to the LED 14 is set to f1.
Alternatively, it can be switched to f2. In this case, the light emission frequency switching function is provided to prevent erroneous detection due to synchronization with a light emission signal from another photoelectric switch.

The setting routine for setting the switching of the light emission frequency is configured as shown in the flowchart of FIG. 10. For example, in the case where the switching can be set by the first variable resistor 8, It can be implemented by replacing the steps B1 to B4 in the setting routine of the first embodiment described above.

In this setting routine, the microcomputer 12 inputs the digital value of the voltage signal input to the input terminal D from the first variable resistor 8 in step G1, and the digital value in step G2. Is "12
8 ”or more. Digital value is "0"
If the value is within the range of “127”, that is, the value in the area A, the microcomputer 12 determines “N” in step G2.
O ”is determined, and the process proceeds to step G3 to set the light emission frequency f1. Also, the digital value is changed from “128” to “25”.
When the value is within the range of "5", that is, the value within the area B, the microcomputer 12 determines "YES" in step G2 and proceeds to step G4 to set the light emission frequency f2.

Thus, the microcomputer 12
In the light emitting operation step of the detection program, a light emitting signal is output at a light emitting cycle according to the light emitting frequency f1 or f2 set as described above.

(5) Fifth Embodiment Next, in a fifth embodiment, a sensitivity adjustment function is provided in place of the two adjustment functions of the detection sensitivity and the detection hysteresis width shown in the third embodiment. With reference to FIG. 11, a description will be given of a case in which a fine adjustment function and a coarse adjustment function are provided in order to more accurately perform the above. Note that the hysteresis width between the ON point detection level and the OFF point detection level is set to 10%.

Then, as in the third embodiment, the first and second variable resistors 8 and 9 perform coarse adjustment and fine adjustment of the detection sensitivity setting at an input level corresponding to the rotation angle of the operation dial 22. The microcomputer 12 sets an ON point detection level and an OFF point detection level in accordance with the rotation angle of the operation dial 22.

Next, the setting of the detection sensitivity in this embodiment will be described with reference to the flowchart of the setting routine of FIG. First, when the user turns the operation dials 22, 22 of the first and second variable resistors 8 and 9 to desired setting positions, the microcomputer 1
2 is the same as in the third embodiment, step H
At 1 and H2, the digital values R1 and R2 of the voltage signals input to the input terminals D and E according to their rotation angles are input, respectively. At the next step H3, based on those digital values, ON is performed. The point detection level Lon and the OFF point detection level Loff are calculated by a predetermined calculation program.

In this case, the input digital value R1 is used as coarse gain setting data for setting the center value of the detection level, and the digital value R2 is fine gain setting which is set based on the value of the coarse gain setting data. Used as data. For the settable detection level center value range, the coarse gain setting data covers the entire range of the adjustment range, and the fine gain setting data covers the third range of the adjustment range. In consideration of these, in the microcomputer 12, the digital values R1 and R
From 2, the values of the ON point detection level Lon and the OFF point detection level Loff are calculated based on the following equation.

Lon = 1.05 × [R1 + (R2-127) / 3] (5) Loff = 0.95 × [R1 + (R2-127) / 3] (6)

Then, in step H4, the microcomputer 12 stores the ON point detection level Lon and the OFF point detection level Loff obtained by the above calculation in the RAM, and sets them. The values of the ON point detection level Lon and the OFF point detection level Loff are set within a range of 10% around the detection level determined by the digital values R1 and R2.

(6) Sixth Embodiment Next, in a sixth embodiment, a function having both the switching function and the adjusting function applied to the variable resistor 8 or 9 in each of the above embodiments is used. The case will be described with reference to FIGS.

In this case, based on the digital value S set by one variable resistor 8 or 9, a timer mode as a detection mode is set to a timer off mode for turning off the timer setting, and an output timing at the time of detection. In the on-delay timer mode and the off-delay mode in which the off-timing of the output signal output at the time of detection is delayed from the non-detection point, and in each of the on-delay timer mode and the off-delay timer mode, The adjustment operation of the timer time setting according to the rotation angle is performed.

FIG. 12 shows the range of the settable rotation angle of the operation dial 22 when the variable resistor 8 is used, for example, and the settable rotation angle is in the range of 0 ° to 260 °. . Then, of the rotation angle range that can be set by the variable resistor 8, an intermediate region that is a range from 120 ° to 140 ° is a timer-off mode setting region f,
The range of the rotation angle on both sides of the intermediate region is in the range of 0 ° to 120 °.
The range from 140 ° to 260 ° is an on-delay timer mode setting area h.

The position at the boundary between the timer-off mode setting area f and the off-delay timer mode setting area g, that is, the rotation angle of the operation dial 22 of the variable resistor 8 is 12
At the position of 0 °, the set value of the timer time Tdoff of the off-delay timer is “0”, and at the position of 0 ° in terms of the rotation angle, the set value of the timer time Tdoff is the maximum (for example, 5 seconds). Further, the position at the boundary between the timer off mode setting area f and the on delay timer mode setting area h, that is, the rotation angle of the operation dial 22 of the variable resistor 8 is set to 14
At the position of 0 °, the set value of the timer time Tdon of the on-delay timer is “0”, and at the position of 260 ° in rotation angle, the set value of the timer time Tdon is the maximum (for example, 5 seconds).

Next, the setting of the timer mode and the setting of the timer time in this embodiment will be described with reference to the flowchart of the setting routine shown in FIG. That is, the microcomputer 12 determines in step J1
The digital value S of the voltage signal input to the input terminal D is read. In this case, the read digital value S is represented by the following equation corresponding to each of the setting range Edoff in the off-delay timer mode, the setting range End in the timer-off mode, and the setting range Edon in the on-delay timer mode.

0 ≦ Edoff ≦ 117 (7) 118 ≦ End ≦ 138 (8) 139 ≦ Edon ≦ 256 (9) That is, the digital value S is in any of the regions of the formulas (7) to (9). This determines the output mode.

The microcomputer 12 executes step J
When the value becomes 2, for example, when the read digital value S is within the setting range Edoff of the off-delay timer mode,
Since it is equal to or less than "118", the determination is "NO" and the process proceeds to step J3 to set the off-delay timer mode. Then, in step J4, a timer time Tdoff is calculated from the digital value S, and in step J5 The timer time Tdoff as the calculation result is stored and set, and the timer setting routine ends. In this case, the microcomputer 12 calculates the timer time Tdoff from the digital value S as follows.

That is, when the digital value S is "117" which is smaller than the lower limit value "118" of the timer off mode, the timer time Tdoff becomes zero, and as the digital value S becomes smaller than that, that is, " As the value of the difference from “117” increases, the timer time Tdoff is lengthened in proportion to the value, and when the digital value S is “0”, the timer time Tdoff is set to the maximum “5 seconds”. It has become. That is, this relationship can be represented by the following arithmetic expression: Tdoff (second) = [(117−S) / 117] × 5 (second) (10)

When the digital value S is within the set range End of the timer off mode, the microcomputer 1
In step 2, since the digital value S is larger than “118” in step J2, the determination is “YES” and the process proceeds to step J6. In this case, since the digital value S is “139” or less, “NO” is determined. Then, the process proceeds to step J7 to set the timer off mode. When the digital value S is within the setting range Edon of the on-delay timer mode, the microcomputer 12 proceeds to step J2.
And J6 is determined to be "YES", the process proceeds to step J8, and the on-delay timer mode is set.

Subsequently, the microcomputer 12 calculates the timer time Tdon from the digital value S in step J9, and calculates the timer time Tdo which is the calculation result in step J10.
n will be set. In this case, the microcomputer 12 calculates the timer time Tdon from the digital value S as follows.

That is, when the digital value S is a value "139" larger than the upper limit value "138" of the timer off mode, the timer time Tdon becomes zero, and as the digital value S becomes larger than that, that is, " 138 ", the timer time Tdon is lengthened in proportion to the value, and when the digital value S is" 256 ", the timer time Tdon is set to the maximum" 5 seconds ". It has become. That is, this relationship can be represented by the following arithmetic expression: Tdon (second) = [(S-139) / 117] × 5 (second) (11)

When the setting of the output mode and the setting of the timer time are completed in this way, the microcomputer 12
Terminates the program of the timer time setting routine, and performs the above-described detection operation according to the timer mode and the timer time set here.

According to this embodiment, as described in the first to sixth embodiments, the externally operable variable resistors 8 and 9 are connected to the upper surface 2 of the main body case 2.
a, which is selected by the microcomputer 12 so as to have one or both of a switching function for switching the detection operation in accordance with the level of the input signal of the variable resistor 8 or 9 and an adjustment function for adjusting the detection operation. Since the configuration is such that the two variable resistors 8 or 9 are provided in the main body case 2, it is possible to have both the switching function and the adjusting function while maintaining various configurations. Even when a plurality of types of detection switches are manufactured in accordance with the functions, only a single type of main body case 2 needs to be manufactured in a configuration for miniaturization, and overall manufacturing costs and management costs can be reduced. At the same time, workability during assembly can be improved.

In the above embodiment, the case where the present invention is applied to a photoelectric switch has been described. However, the present invention is not limited to this. For example, an ultrasonic switch for detecting an object by ultrasonic waves, another detection such as a proximity switch, or the like. It can also be applied to switches.

In the above embodiment, the case where the present invention is applied to a photoelectric switch having a configuration in which two variable resistors 8 and 9 are provided has been described. However, the present invention is not limited to this. For example, one variable resistor is used. The present invention can also be applied to a configuration using three or more variable resistors, and in the present invention, the effect increases as the number of variable resistors increases. Things.

In the above-described embodiment, the case where the variable resistors 8 and 9 are used as changeover switches and the structure is changed into two areas, the area A and the area B, and switching is performed, but the present invention is not limited to this. Instead, for example, a configuration in which a rotatable angle region of the variable resistor is divided into a plurality of regions of three or more and detected by the microcomputer 12 may be a configuration that can be switched and set in a plurality of stages. .

[0091]

According to the detection switch of the present invention , the main body
A plurality of variable resistors that can be operated from outside
In the control means, for each of the plurality of variable resistors,
Select and set either the switching function or the adjustment function.
With this configuration, it is possible to manufacture a detection switch that has both the switching function and the adjustment function while providing the same variable resistor in the main body case, and supports various functions. When a plurality of types of detection switches are manufactured, the use of a common main body case eliminates the need to manufacture a plurality of types of main body cases while reducing the size. Not only improves the workability during assembly, but also improves the appearance.
With the same shape of the main body case with multiple variable resistors
However, when the number of setting of the switching function and the adjustment function is different,
There is an excellent effect that several types can be obtained . Further, according to the detection switch of the present invention, the control means detects whether or not the level of the input signal for at least one of the plurality of variable resistors is within a set range. Since the switching function for switching the operation is selectively set, it is possible to provide a switching function by the variable resistor while providing two or more variable resistors. As a result, the main body case can be provided. Since there is no need to provide a switch arrangement portion for providing a switching function, the main body case can be shared. Further, according to the detection switch of the present invention, the control means selectively selects and sets a composite function having both a switching function and an adjusting function for at least one of the plurality of variable resistors. While the variable resistor is provided, the variable resistor can be used as a means having a high function.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention.

FIG. 2 is an electrical configuration diagram of a basic configuration.

FIG. 3 is an explanatory diagram of an operation dial of a variable resistor according to the first embodiment.

FIG. 4 is a flowchart of a detection operation program.

FIG. 5 is a flowchart of a setting routine.

FIG. 6 is a diagram corresponding to FIG. 4 in a second embodiment.

FIG. 7 is a diagram corresponding to FIG. 5;

FIG. 8 is a view corresponding to FIG. 4 in a third embodiment.

FIG. 9 is a diagram corresponding to FIG. 5;

FIG. 10 is a view corresponding to FIG. 5 in a fourth embodiment.

FIG. 11 is a view corresponding to FIG. 5 in a fifth embodiment.

FIG. 12 is a view corresponding to FIG. 3 in a sixth embodiment.

FIG. 13 is a diagram corresponding to FIG. 5;

[Explanation of symbols]

1 is a photoelectric switch (detection switch), 2 is a main body case,
3, 4 are optical fiber cables, 5 is a cable, 6, 7 is a display element, 8 is a first variable resistor, 9 is a second variable resistor, 10 is a nameplate, 11 is a case cover, and 12 is a microcomputer. (Control means), 13 is a light emitting circuit, 14 is L
ED, 17 is a light receiving circuit, 18 is a photodiode, 20
Is an amplifier circuit, 21 is an npn transistor for output, 2
Reference numeral 2 denotes an operation dial.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Satoru Ichimura 3-5-3 Akebonocho, Tachikawa-shi, Tokyo Thanks Inc. (56) References JP-A-63-160124 (JP, A) 60-155143 (JP, U) Fully open 1975-173837 (JP, U) Fully open 62-26936 (JP, U)

Claims (3)

(57) [Claims] A main body case provided on the main body case;
Object output from detection means in the presence of the detected object
Control means for performing a detection operation based on the detection signal.
In the detection switch, a plurality of variable resistors are operable from outside to the main body case.
A control unit , wherein the control means is provided for each of the plurality of variable resistors.
On the other hand, the input signal level based on the resistance value of the variable resistor
The detection operation is stopped depending on whether the bell is within the predetermined range.
Switching function based on the resistance value of the variable resistor
Adjustment function that adjusts the detection operation according to the level of the input signal
Is configured to select one of
Characteristic detection switch. 2. A detection switch having control means for performing a detection operation based on an object detection signal output from a detection means in a state where an object to be detected is present, wherein a plurality of variable resistors are operable from the outside of a main body case. Wherein the control means determines whether the level of an input signal based on the resistance value of at least one of the plurality of variable resistors is within a predetermined range. Select the switching function to switch the detection operation according to the setting, and for those not setting this switching function, select and set the adjustment function to adjust the detection operation according to the level of the input signal based on the resistance value of the variable resistor A detection switch characterized in that the detection switch is configured to: 3. A detection switch having a control means for performing a detection operation based on an object detection signal output from a detection means in a state where an object to be detected is present. A control unit configured to determine whether a level of an input signal based on a resistance value of at least one of the plurality of variable resistors is within a predetermined range. Switching function to switch the detection operation according to whether or not, and the resistance of the variable resistor
Select and set so as to have both adjustment functions for adjusting the detection operation according to the level of the input signal based on the value, and select and set either the switching function or the adjustment function for the remaining variable resistors. A detection switch characterized by being constituted.