JP4758756B2 - Detector and measurement system using the same - Google Patents

Description

  The present invention relates to a detector that detects the presence or absence or physical quantity of an object, and a measurement system using the same.

  The contact-type displacement meter has a contactor (movable part) and a transformer that are in contact with the surface of an object and can be displaced in the axial direction (see, for example, Patent Document 1).

  The transformer includes a core that interlocks with the contact. When the core is displaced according to the displacement of the contact, the level of the signal output from the transformer changes in accordance with the displacement of the contact. In such a configuration, the physical displacement amount such as the height of the target object is measured by converting the physical displacement amount of the target object into an electric quantity.

  A contact displacement meter generally includes a head portion including a transformer and a main body portion that controls the head portion (see, for example, Patent Document 2). An external signal is input to the main body from an external device such as a PLC (programmable logic controller). Thereby, the physical displacement amount of the object is measured at the input timing of the external signal.

  When measuring the amount of physical displacement at a plurality of locations of an object, a plurality of contact displacement meters are used. Usually, the head portions of a plurality of contact displacement meters are installed near the measurement location of the object, and the main body is installed at a location away from the measurement location.

  For example, an allowable range of physical displacement of one location (hereinafter referred to as location A) on a certain object is set to 1 ± 0.1 mm, and physical displacement of another location (hereinafter referred to as location B). Is set to 2 ± 0.1 mm. In this case, the head portion of one contact displacement meter is installed at the location A, and the head portion of another contact displacement meter is installed at the location B.

In such a case, it is necessary to perform setting of the head unit installed at the location A and setting of the head unit installed at the location B by each main body unit connected to each head unit. That is, the user needs to recognize to which body part the head unit installed at the location A is connected and to which body unit the head unit installed at the location B is connected.
Japanese Patent Laid-Open No. 2000-9412 JP 2002-131037 A

  As described above, since the head unit and the main body unit are installed at a distance from each other, the user can trace each head unit and each main unit by following the connection cable in a state where each head unit is connected to each main unit. I was investigating the correspondence with the department. In addition, the user has put an identification sticker so that the correspondence with the main body can be understood when installing the head.

  Therefore, as a result of the extra work being added, the number of man-hours for measurement is increased, and the correspondence between each head portion and each main body portion may become unclear due to peeling of the identification seal.

  The objective of this invention is providing the detector which can recognize the head part connected to the main-body part easily, and a measurement system using the same.

A contact displacement meter according to a first invention is a detector that detects the presence or absence or physical quantity of an object, and includes a head unit including detection means for detecting the presence or absence or physical quantity of an object as an electrical signal; A separate body and electrically connected to the head portion by wire or wirelessly, and a main body portion that performs a determination process as to whether or not a preset condition is satisfied based on an electrical signal obtained from the detection means, The head unit includes an indicator lamp that performs lighting display with a predetermined color, and by changing the predetermined color of the indicator lamp according to the result of the determination process in the main body unit , the result of the determination process performs display in response to a user instruction to the main body portion for confirming the connection relationship between the head portion, the lighting display of the indicator to change blink color that is lit and displayed on the indicator Ri, and performs display of the connection between the head portion.

  The detector according to the present invention includes a head portion and a main body portion that is provided separately from the head portion and is electrically connected to the head portion by wire or wirelessly.

In such a detector, the presence / absence or physical quantity of the object is detected as an electrical signal by the detection means of the head unit. Based on the electrical signal obtained from the detection means, a determination process is performed by the main body portion to determine whether or not a preset condition is satisfied .

The indicator lamp of the head unit displays the result of the determination process by changing a predetermined color of the indicator lamp according to the determination process result in the main body. In addition, in response to a user instruction to the main unit for confirming the connection relationship with the head unit, the indicator light of the head unit is changed from the lighting display of the indicator lamp to the blinking display of the color displayed on the indicator lamp. By changing, the connection relationship with the head unit is displayed.

  Here, when measuring the physical quantity of the several location of a target object, a some head part is used. A main body is connected to each head.

In this case, the user can recognize the result of the determination process and the head unit electrically connected to the main body unit by changing the color displayed on the indicator lamp and the blinking display of the color. .
Moreover, since the indicator lamp for indicating the result of the determination process also serves as a display unit for recognizing the head unit connected to the main body unit, it is necessary to provide a new display unit for recognizing the head unit. Absent. Thereby, it is possible to reduce the size and cost of the head portion of the detector.

The detection means detects the physical displacement amount of the object as an electrical signal, and the main body acquires the electrical signal obtained by the detection means as a measurement value of the physical displacement amount, and the acquired measurement value is determined in advance. It may be determined whether it is within the allowable range.

In this case, the physical displacement amount of the object is detected as an electric signal by the detecting means. Moreover, the electric signal obtained by the detection means is acquired by the main body as a measured value of the physical displacement. Further, it is determined by the main body portion whether or not the acquired measurement value is within a predetermined allowable range. With such a configuration, it is detected whether or not the physical displacement of the object is within an allowable range.

  The detection means may include a contact that is displaced by contact with an object, and a conversion means that converts the displacement of the contact into an electrical signal.

  In this case, the contact is displaced by contacting the object, and the displacement of the contact is converted into an electrical signal by the conversion means. Thereby, an accurate physical displacement amount of the object can be obtained.

A measurement system according to a second invention is a measurement system including a plurality of detectors that detect the presence or absence or physical quantity of an object, and each of the plurality of detectors detects the presence or absence or physical quantity of an object as an electrical signal. A head unit including a detecting unit to be connected to the head unit and electrically connected to the head unit by wire or wirelessly and satisfying a preset condition based on an electrical signal obtained from the detecting unit And a main body unit that performs a determination process, and the head unit includes a display lamp that performs a lighting display with a predetermined color , and the predetermined display lamp is determined in accordance with a result of the determination process in the main body unit . by changing the color, along with the display of the result of the determination process, in accordance with a user instruction to the main body portion for confirming the connection relationship between the head portion, on the display lamp lighting display of the display lamp By changing the blinking display color being lit display, to display the connection relationship between the head portion, the body portion of one detector of the plurality of detectors, and the result of the determination process by the main body portion This is a composite operation of the result of determination processing by the main body of another detector.

  Each detector in the measurement system according to the present invention includes a head unit and a main body unit provided separately from the head unit and electrically connected to the head unit by wire or wirelessly.

In such a detector, the presence / absence or physical quantity of the object is detected as an electrical signal by the detection means of the head unit. Based on the electrical signal obtained from the detection means, a determination process is performed by the main body portion to determine whether or not a preset condition is satisfied .

The indicator lamp of the head unit displays the result of the determination process by changing a predetermined color of the indicator lamp according to the determination process result in the main body. In addition, in response to a user instruction to the main unit for confirming the connection relationship with the head unit, the indicator light of the head unit is changed from the lighting display of the indicator lamp to the blinking display of the color displayed on the indicator lamp. By changing, the connection relationship with the head unit is displayed.
Furthermore, the result of the determination process performed by the main body of one detector and the result of the determination process performed by the main body of another detector are combined and calculated by the main body of one of the plurality of detectors.

  Here, if the correspondence between each head unit and each main body unit connected thereto is erroneously recognized and a predetermined setting is made for each head unit, an error occurs in the result of the composite operation.

In the measurement system according to the present invention, the user changes the result of the determination process and the head part electrically connected to the main body part to the color displayed on the indicator lamp and the blinking display of the color. Can be recognized.
Moreover, since the indicator lamp for indicating the result of the determination process also serves as a display unit for recognizing the head unit connected to the main body unit, it is necessary to provide a new display unit for recognizing the head unit. Absent. Thereby, it is possible to reduce the size and cost of the head portion of the detector.

  According to the present invention, it is possible to easily recognize the head portion connected to the main body portion.

  Hereinafter, a contact displacement meter as an example of a detector according to the present invention will be described with reference to the drawings.

(1) Overall Configuration of Contact Displacement Meter FIG. 1 is a block diagram showing the configuration of the contact displacement meter according to the present embodiment.

  As shown in FIG. 1, a contact displacement meter 100 according to the present embodiment includes a head portion 100A and a main body portion 100B. Although not shown in FIG. 1, the main body unit 100B includes a display unit 32 described later. Details of the display unit 32 will be described later.

  The head portion 100A and the main body portion 100B are connected to each other by a cable 80. The main body 100B is connected to an external device (not shown) via a cable 81.

  2 is a block diagram showing a configuration of the head unit 100A of FIG. 1, and FIG. 3 is a block diagram showing a configuration of the main body unit 100B of FIG.

  As shown in FIG. 2, the head unit 100A includes a transformer 1, a contact 1a that can be expanded and contracted and is in contact with an object, a transformer drive circuit 2, a signal detection circuit 3, an amplifier circuit 4, an EEPROM (Electrically Erasable and Programmable Read). Only Memory) 5, indicator lamp control circuit 6, indicator lamp 7, power supply circuit 8, comparator 9, and switch 10.

  As shown in FIG. 3, the main body 100B includes a CPU 20, a PWM (pulse width modulation) output circuit 21, a first filter circuit 22, a second filter circuit 23, and an A / D (analog / digital) converter. 24, communication interface 25, power supply circuit 26, drive circuit 27, first to third input circuits 28a, 28b, 28c, overcurrent detection circuit 29, first to third output circuits 30a, 30b, 30c, EEPROM 31, A display unit 32, a display panel 33, an input unit 34, and a connection unit 50 are provided.

  Signals are transmitted and received between the head unit 100A and the main body unit 100B via the cable 80. In this case, the cable 80 connected to the head unit 100A is connected to the connection unit 50 of the main body unit 100B.

  In FIG. 3, first, the CPU 20 gives a rectangular wave pulse signal for operating the transformer 1 to the PWM output circuit 21. The PWM output circuit 21 converts the rectangular wave pulse signal into a sine wave signal. The first filter circuit 22 removes noise from the sine wave signal and supplies the sine wave signal to the transformer drive circuit 2 in FIG.

  The transformer drive circuit 2 applies a sine wave current to the transformer 1 in response to the sine wave signal. Details of the configuration and operation of the transformer 1 will be described later.

  Subsequently, the transformer 1 supplies two voltage signals (described later) to the signal detection circuit 3. The signal detection circuit 3 subtracts the two voltage signals from each other and gives a differential voltage to the amplifier circuit 4.

  The amplifier circuit 4 performs impedance conversion and supplies a differential voltage to the second filter circuit 23 (FIG. 3). The second filter circuit 23 converts the differential voltage into a DC voltage and supplies the DC voltage to the A / D converter 24.

  The A / D converter 24 converts the DC voltage into a digital value, and gives the conversion result to the CPU 20 as a measured value of the physical displacement. The CPU 20 controls the display unit 32, the drive circuit 27, and the like based on the given measurement value.

  Signals are transmitted / received to / from an external device such as a main body of another contact displacement meter, a personal computer, or a PLC (programmable logic controller) (each not shown) via the communication interface 25 of the main body 100B. be able to. For example, when it is desired to import information related to the main body 100B into the PLC, information is transmitted to and received from the PLC via the communication interface 25.

  The power supply circuit 26 of the main body 100B is connected to an external DC power supply (not shown) of 24V, for example, and supplies power to each component of the head 100A via the power supply circuit 8 of the head 100A and the main body 100B. Electric power is supplied to each of the components.

  The drive circuit 27 supplies a current required for turning on or blinking the indicator lamp 7 of the head unit 100 </ b> A to the indicator lamp control circuit 6 via the switch 10.

  Here, the CPU 20 can switch the voltage level of the power supply circuit 8 of the head portion 100A via the power supply circuit 26 of the main body portion 100B. This voltage level includes, for example, 8.5 V in the communication mode performed at startup and 6.5 V in the normal operation mode.

  The communication mode is a mode in which the CPU 20 receives correction information stored in the EEPROM 5 of the head unit 100A, and the normal operation mode is a display that is performed when the CPU 20 controls the indicator lamp control circuit 6 of the head unit 100A. A mode in which the lamp 7 is turned on or blinked. The correction information stored in the EEPROM 5 will be described later.

  The comparator 9 of the head unit 100A connects the switch 10 to the EEPROM 5 side when the voltage level is 8.5 V based on the switching of the voltage level of the power supply circuit 8 by the CPU 20. On the other hand, the comparator 9 connects the switch 10 to the indicator light control circuit 6 side when the voltage level is 6.5V. With this configuration, the contact displacement meter 100 can be switched between the communication mode and the normal operation mode.

  The first to third input circuits 28a, 28b, 28c give the CPU 20 predetermined signals input from the outside. The predetermined signal is, for example, a timing signal for instructing the start of measurement, a preset signal for setting a reference position, or the like.

  The first to third output circuits 30a, 30b, and 30c are allowed by the CPU 20 including the physical displacement amount of the object obtained in accordance with the differential voltage from the head unit 100A and preset upper and lower limits. Based on the range, signals can be output to the outside.

  Specifically, for example, the first output circuit 30a outputs a determination signal of a predetermined level (for example, “H” level) when the physical displacement amount of the object exceeds the upper limit value of the allowable range. . Further, the second output circuit 30b outputs a determination signal of a predetermined level (for example, “H” level) when the physical displacement amount of the object is within the allowable range. Further, the third output circuit 30c outputs a determination signal of a predetermined level (“H” level or “L” level) when the physical displacement amount of the object is below the lower limit value of the allowable range.

  The overcurrent detection circuit 29 monitors whether or not a current equal to or higher than the rated current value flows through the first to third output circuits 30a, 30b, and 30c. When a current equal to or higher than the rated current value flows in any of the first to third output circuits 30a, 30b, and 30c, the overcurrent detection circuit 29 temporarily turns the output circuit off. Thereafter, the CPU 20 periodically turns on the output circuit, and the overcurrent detection circuit 29 continues to monitor the output circuit.

  The EEPROM 31 of the main body 100B stores correction information. This correction information will be described later.

  The display unit 32 displays the amount of physical displacement of the object under the control of the CPU 20. The display unit 32 includes a display panel 33 and an input unit 34. Details of the display panel 33 and the input unit 34 will be described later with reference to the drawings. The reset circuit 35 resets the CPU 20 to an initial state by giving a reset signal to the CPU 20 based on a user's operation.

  Here, when the frequency of use of the contact 1a is increased, the head unit 100A often fails. In such a case, the main body 100B is used as it is, and the head 100A is replaced with a new one.

  First, a new head portion 100A (hereinafter simply referred to as the head portion 100A) is attached to the main body portion 100B. The CPU 20 of the main body 100B communicates with the EEPROM 5 of the head 100A in the communication mode.

  The EEPROM 5 stores correction information of the head unit 100A (hereinafter referred to as head correction information) and correction information of an inspection master main body (to be described later) (hereinafter referred to as master correction information).

  The head correction information is information for correcting variation in the relationship between the physical displacement amount of the object and the output value from the A / D converter 24 of the main body 100B (hereinafter referred to as a displacement-output table). is there.

  The master correction information is information for correcting variation in the displacement-output table of the inspection master body used for obtaining the head correction information.

  The CPU 20 communicates with the EEPROM 5 to acquire the master correction information. Next, the CPU 20 communicates with the EEPROM 31 of the main body 100B.

  The EEPROM 31 stores correction information of the main body 100B (hereinafter referred to as main body correction information).

  The main body correction information is information for correcting variations in the relationship between the level of the DC voltage converted by the second filter circuit 23 of the main body 100B and the output value from the A / D converter 24.

  The CPU 20 communicates with the EEPROM 31 to acquire the main body correction information. Then, based on the acquired main body correction information and master correction information, the CPU 20 uses the same state as the state in which the reference master body for inspection is used, that is, from the output value of the A / D converter 24, the object. Create a state that can recognize the exact amount of physical displacement.

  Thereafter, the CPU 20 communicates with the EEPROM 5 to acquire the head correction information, thereby accurately determining the relationship between the DC voltage level of the second filter circuit 23 and the output value of the A / D converter 24. Create a recognizable state. Thereby, even when the head portion 100A is replaced, the main body portion 100B can be brought into the same state as the master main body portion serving as a reference, and an appropriate physical displacement amount of the object can be obtained.

(2) Configuration of Transformer Next, a detailed configuration of the transformer 1 of the head unit 100A will be described with reference to the drawings.

  FIG. 4 is a schematic diagram showing a detailed configuration of the transformer 1.

  As shown in FIG. 4, the transformer 1 includes a primary coil 1b, a secondary coil 1c, a primary resistor 1d, a secondary resistor 1e, and a core C made of a magnetic material. The core C is provided so as to be capable of reciprocating in the primary side coil 1b and the secondary side coil 1c in conjunction with the contact 1a.

  One end of the primary side coil 1 b is connected to the transformer drive circuit 2, and the other end is connected to the signal detection circuit 3. One end of the secondary coil 1 c is grounded, and the other end is connected to the signal detection circuit 3. The winding directions of the primary coil 1b and the secondary coil 1c are opposite to each other.

  One end of the primary side resistor 1d is connected to the node N1 between the primary side coil 1b and the signal detection circuit 3, and the other end is grounded. One end of the secondary side resistor 1e is connected to the node N2 between the secondary side coil 1c and the signal detection circuit 3, and the other end is grounded.

  In such a configuration, when a sine wave current flows from the transformer drive circuit 2 to the primary side coil 1b, an induced current flows to the secondary side coil 1c accordingly. In this case, a voltage drop occurs in the primary resistor 1d and a voltage drop also occurs in the secondary resistor 1e. The voltage of the node N1 at one end of the primary side resistor 1d and the voltage of the node N2 at one end of the secondary side resistor 1e are supplied to the signal detection circuit 3.

  As described above, when the core C is moved in a state where the induced current flows through the secondary coil 1c, the mutual inductance between the primary coil 1b and the secondary coil 1c changes. Thereby, the voltage of the node N2 changes depending on the position of the core C.

  The signal detection circuit 3 calculates a differential voltage between the voltage at the node N1 and the voltage at the node N2, and applies the differential voltage to the amplifier circuit 4. With such a configuration, the amount of physical displacement of the object can be detected by converting the amount of movement of the contact 1a into a differential voltage.

  In the present embodiment, the winding direction of the primary side coil 1b and the secondary side coil 1c is opposite, so that the resistance components of the primary side coil 1b and the secondary side coil cancel each other. Thus, by canceling out the resistance component having a characteristic that varies depending on the temperature, the accurate differential voltage can be obtained without being affected by the temperature change at the place where the contact displacement meter 100 is used. As a result, an accurate physical displacement amount of the object can be obtained.

(3) Configuration of Display Unit Next, the configuration of the display unit 32 of the main body unit 100B will be described with reference to the drawings.

  FIG. 5 is a schematic diagram illustrating a configuration of the display unit 32 of the main body 100B.

  As shown in FIG. 5, the display unit 32 of the main body unit 100 </ b> B includes a display panel 33 and an input unit 34.

  The display panel 33 includes three output indicator lights 41, a 7-segment LED 42 and a bar display unit 43. The input unit 34 includes a mode key 44, a set key 45, and a cross key 46.

  The user can shift from the normal mode to the setting mode by pressing the mode key 44 for 3 seconds or more in the normal mode for displaying the measured values and the like, and can display the setting menu on the 7-segment LED 42. .

  Further, the user can change the setting item of the setting menu by operating the cross key 46 left and right, and can change the value of the setting item by operating the cross key 46 up and down. Further, the user can determine the value of the setting item by pressing the set key 45. The setting items include a preset value, an upper limit value and a lower limit value for determining an allowable range.

  The 7-segment LED 42 displays the measured value of the object, and one of the output indicator lamps 41 is lit (HI lit) when the measured value exceeds the upper limit value. One is lit when the measured value is within the allowable range (GO lit), and the other one of the output indicator lights 41 is lit when the measured value is below the lower limit (LO lit). To do.

  Here, in the present embodiment, when the measured value is within the allowable range, the indicator lamp 7 of the head portion 100A is lit in green, and when the measured value is outside the allowable range, the indicator lamp 7 lights red.

  In addition, the bar display unit 43 displays the degree of entry of which position in the allowable range the measurement value is in by a plurality of bars. Thereby, the user can easily recognize whether the measured value is a value near the lower limit value or the upper limit value, or whether there is a margin in the position of the measured value within the allowable range.

(4) Display process Next, the display process of the indicator lamp 7 of the head unit 100A by the CPU 20 will be described.

  FIG. 6 is a flowchart showing the display process of the indicator lamp 7 of the head unit 100A by the CPU 20.

  As shown in FIG. 6, first, the CPU 20 determines whether or not the measured value is within an allowable range (step S1). When the measured value is within the allowable range, the CPU 20 determines the display color by the indicator lamp 7 to be green (step S2).

  In the process of step S1, if the measured value is not within the allowable range, the CPU 20 determines the display color by the indicator lamp 7 to be red (step S3).

  Next, the CPU 20 determines whether or not the user has pressed the mode key 44 for a predetermined time (for example, 3 seconds) (step S4). When the user presses the mode key 44 for a predetermined time, the CPU 20 determines that the display method by the indicator lamp 7 is blinking (step S5).

  If the mode key 44 has not been pressed for a predetermined time by the user, the CPU 20 decides to turn on the display method by the indicator lamp 7 (step S6). Note that the display method may be determined by whether or not another key such as the cross key 46 is pressed instead of the mode key 44 in the process of step S4.

  Next, the CPU 20 displays the indicator lamp 7 of the head unit 100A with the display color and display method determined as described above (step S7).

  In this case, when the measured value is within the allowable range and the user presses the mode key 44 for a predetermined time, the indicator lamp 7 blinks in green.

  When the measured value is within the allowable range and the mode key 44 has not been pressed for a predetermined time by the user, the indicator lamp 7 is lit in green.

  If the measured value is not within the allowable range and the mode key 44 is pressed for a predetermined time by the user, the indicator lamp 7 blinks in red.

  Furthermore, when the measured value is not within the allowable range and the user has not pressed the mode key 44 for a predetermined time, the indicator lamp 7 is lit in red.

  Thus, the user can simultaneously recognize the determination result as to whether or not the measured value is within the allowable range and the head unit 100A connected to the main body unit 100B.

(5) Effects in the present embodiment When measuring physical displacement amounts at a plurality of locations of an object, a plurality of head portions 100A are used. A main body 100B is connected to each head 100A. In such a configuration, a determination signal output from each main body 100B may be given to one main body 100B, and the main body 100B may perform a composite operation described later based on these determination signals.

  In this case, if the correspondence between each head unit 100A and each main body unit 100B connected thereto is erroneously recognized and a predetermined setting is made for each head unit 100A, an error occurs in the calculation result of the composite operation.

  Therefore, in the present embodiment, when the user presses the mode key 44 of the main body 100B for a predetermined time, the indicator lamp 7 of the head 100A connected to the main body 100B blinks. Thereby, the user can easily recognize the head portion 100A connected to the main body portion 100B. At the same time, the display color of the indicator lamp 7 differs depending on whether or not the measured value is within the allowable range. Thereby, the user can recognize the determination result at the same time.

  In addition, since the indicator lamp 7 for indicating the determination result also serves as a display unit for recognizing the head unit 100A connected to the main body unit 100B, a new display unit for recognizing the head unit 100A is provided. There is no need. Thereby, size reduction and cost reduction of the head portion 100A of the contact displacement meter 100 can be achieved.

(6) Compound Operations Hereinafter, a plurality of examples of compound operations performed by the CPU 20 of the main body 100B will be described with reference to the drawings.

  FIG. 7 is an explanatory diagram for explaining a plurality of examples of the composite operation.

  FIG. 7A is not an example of a composite operation, but an example in which locations A to D of the object W are measured and it is determined whether or not each measured value is within an allowable range.

  FIG. 7B illustrates an example in which the difference between the maximum value and the minimum value among the measurement values at the locations A to D is calculated, and it is determined whether or not the calculation result is within the allowable range. In the example of FIG. 7B, the measured value at the location C is the maximum value, and the measured value at the location B is the minimum value.

  FIG. 7C shows an example of calculating how much difference there is between the measured value at each location and the measured value at the reference location. In the example of FIG. 7C, the location A is a reference location, and the difference between the measured values at locations B and C and the measured value at location A is calculated.

  FIG. 7D and FIG. 7E are examples of torsion calculation and warpage calculation, respectively, and examples of determining values X and Y calculated based on the following formula (1) and the following formula (2), respectively. It is.

X = (ab)-(dc) (1)
Y = b + (a + c) / 2 (2)
In addition, in the above formula (1) and the above formula (2), a to d indicate measured values of the locations A to D.

  FIG. 7F is an example in which the average value of the measured values at locations A to D is calculated. FIG. 7G is an example in which the thickness of the object W is measured. In this case, the sum of the measured value of the location A and the measured value of the location B obtained by the two head units 100A is calculated as the thickness.

(7) Other Embodiments In the above embodiment, the display color of the indicator lamp 7 when the measured value is within the allowable range is green, and the display lamp 7 is displayed when the measured value is not within the allowable range. Although the example in which the color is red has been described, a predetermined display color is displayed on the indicator lamp 7 when the measured value is within the allowable range, and the indicator lamp 7 is turned off when the measured value is not within the allowable range. Also good.

  Moreover, although the said embodiment demonstrated the case where the indicator lamp 7 which shows the determination result whether a measured value is in a tolerance | permissible_range was provided, this case also when the indicator lamp 7 is not provided. The invention can be applied as well. For example, when an energization indicator lamp indicating that current is supplied to the head unit 100A is provided, a blinking display for recognition of the head unit 100A may be performed by the energization indicator lamp.

  Further, when the plurality of main body portions 100B are sequentially connected, the indicator lights 7 of the head portions 100A connected to the main body portions 100B may be blinked in the order of connection. With such a configuration, the user can easily recognize not only the correspondence between each head unit 100A and each main body unit 100B but also the connection order of the plurality of main body units 100B. In this case, the blinking speed or blinking time may be changed for each indicator lamp 7.

  Further, in addition to the indicator lamp 7 in the head unit 100A, a display unit may be newly provided for the recognition of the head unit 100A. In this case, the display unit is configured to be turned on or blinked when the user presses the mode key 44 for a predetermined time.

  Moreover, you may provide indicator, such as 7 segment LED or a liquid crystal display, in the head part 100A. In this case, when the user presses the mode key 44 for a predetermined time, a display for recognizing the head unit 100A is performed with various display patterns on a display such as a 7-segment LED or a liquid crystal display. For example, a common identification number (ID) with the main body 100B may be displayed on the display of the head 100A.

  Further, a plurality of indicator lamps may be provided in each head unit 100A, and a different indicator lamp of the corresponding head unit 100A may be turned on or blinked for each main body unit 100B. Further, the indicator lamps of the head unit 100A corresponding to each main body unit 100B may be lit in different colors.

  In the above embodiment, the head portion 100A and the main body portion 100B are connected by the cable 80, but the head portion 100A and the main body portion 100B may be connected by wireless communication.

  Furthermore, in the above embodiment, the example in which the present invention is used for a contact displacement meter has been described. However, the present invention is not limited to this example. Photoelectric sensor for detecting presence / absence, proximity sensor for detecting presence / absence of object, flow sensor for detecting flow rate as physical quantity, pressure sensor for detecting pressure, non-contact temperature sensor for detecting temperature of object, presence / absence of object The present invention can be similarly applied to other sensors such as an ultrasonic sensor for detecting the image and an image sensor for detecting an image of an object.

(8) Correspondence between each component of claim and each part of embodiment The following describes an example of the correspondence between each component of the claim and each part of the embodiment. It is not limited.

In the above embodiment, the contact displacement meter 100 corresponds to the detector, the transformer 1 corresponds to the detection means and the conversion means, the CPU 20 corresponds to the processing means, the command means, the acquisition means, and the determination means, and the display The lamp 7 corresponds to an indicator lamp .

  The detector according to the present invention can be used to detect the presence or absence or physical quantity of an object.

It is a block diagram which shows the structure of the contact-type displacement meter which concerns on this Embodiment. It is a block diagram which shows the structure of the head part of FIG. It is a block diagram which shows the structure of the main-body part of FIG. It is a schematic diagram which shows the detailed structure of a transformer. It is a schematic diagram which shows the structure of the display part of a main-body part. It is a flowchart which shows the display process of the indicator light of a head part by CPU. It is explanatory drawing for demonstrating the several example of compound operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transformer 1a Contact 2 Transformer drive circuit 3 Signal detection circuit 4 Amplifier circuit 5 EEPROM
6 Indicator lamp control circuit 7 Indicator lamp 8 Power supply circuit 9 Comparator 20 CPU
DESCRIPTION OF SYMBOLS 21 PWM output circuit 22 1st filter circuit 23 2nd filter circuit 24 A / D converter 25 Communication interface 28a, 28b, 28c 1st-3rd input circuit 29 Overcurrent detection circuit 30a, 30b, 30c 1st ~ Third output circuit 31 EEPROM
32 Display 33 Display Panel 34 Input 41 Output Indicator 42 7 Segment LED
43 Bar display unit 44 Mode key 45 Set key 46 Cross key 50 Connection unit 80 Cable 100 Contact displacement meter 100A Head unit 100B Main unit C core

Claims (4)

A detector for detecting the presence or absence or physical quantity of an object,
A head unit including detection means for detecting the presence or absence or physical quantity of an object as an electrical signal;
It is provided as a separate body from the head unit, and is electrically connected to the head unit by wire or wirelessly, and performs a determination process as to whether or not a preset condition is satisfied based on an electrical signal obtained from the detection unit A main body,
The head unit includes an indicator lamp that performs lighting display with a predetermined color, and the determination is performed by changing a predetermined color of the indicator lamp according to a result of the determination process in the main body. In response to a user instruction to the main unit for confirming the connection relationship with the head unit, the display result of the process is displayed, and the display lamp is turned on in the color displayed on the display lamp. A detector that displays a connection relationship with a head unit by changing to a blinking display . The detection means detects a physical displacement amount of the object as an electrical signal,
The main body section acquires an electrical signal obtained by the detection means as a measurement value of the physical displacement, and determines whether or not the acquired measurement value is within a predetermined allowable range. The detector according to claim 1 . The detection means includes
A contact that is displaced by contact with an object;
3. The detector according to claim 2 , further comprising conversion means for converting a displacement amount of the contact into an electric signal. A measurement system including a plurality of detectors for detecting the presence or absence or physical quantity of an object,
Each of the plurality of detectors is
A head unit including detection means for detecting the presence or absence or physical quantity of an object as an electrical signal;
It is provided as a separate body from the head unit, and is electrically connected to the head unit by wire or wirelessly, and performs a determination process as to whether or not a preset condition is satisfied based on an electrical signal obtained from the detection unit A main body,
The head unit includes an indicator lamp that performs lighting display with a predetermined color, and the determination is performed by changing a predetermined color of the indicator lamp according to a result of the determination process in the main body. In response to a user instruction to the main unit for confirming the connection relationship with the head unit, the display result of the process is displayed, and the display lamp is turned on in the color displayed on the display lamp. By changing to blinking display, the connection relationship with the head part is displayed ,
The main body portion of one detector among the plurality of detectors performs a composite operation on a result of determination processing by the main body portion and a result of determination processing by the main body portion of another detector. system.

Images