JPH02106785A - Sensor module - Google Patents

Abstract

PURPOSE:To facilitate handling and storing and to decreases damages on circuit parts, etc., without impairing the workability of practicing with a detection circuit by attracting screws by means of magnets, mounting the screws attachably and detachably to the front side of a circuit board and providing a transparent cover which covers the circuit board and sensor. CONSTITUTION:A case 38 in a case 38 is constituted of the circuit board 28 provided with the detection circuit and the sensor 30, a holding plate 40 of a flat plate shape having approximately the same square shape and the transparent cover 42 forming likewise the square shape. The circuit board 28 is mounted with the front side faced upward onto a holding plate 40 by means of 4 pieces of the iron screws 44. The cover 42 is of a container shape and covers the front side of the circuit board 28 as the aperture of the cover is fitted to the peripheral edge part of the holding plate 40. Circular cylinders 46 are provided to the four points corresponding to the screws 44 and the magnets 48 are embedded to the bottom end parts thereof to attract the screws 4, by which the cover is attachably and detachably fixed to the plate 40. Damaging of the circuit parts and the sensor by touching these parts with hand at the time of attaching or detaching the module to or from the measuring base 10 or during storage is obviated in this way and the handling and storing thereof are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sensor module for sensor training, and more particularly to a sensor module that is easy to handle and store, and which causes little damage to circuit components.

2. Description of the Related Art Sensor training devices for learning about conventional technology sensors are widely used in educational settings such as schools and companies. For example, a sensor and a measurement object for changing the physical quantity measured by the sensor are placed on a measurement stand.
By performing measurements while changing physical quantities, students learn the principles, functions, and how to use the sensors.The above-mentioned sensors are also equipped with a drive circuit to drive the sensor, and an amplification device to amplify the output signal from the sensor. The circuit board is equipped with the detection circuits necessary for the sensor to perform measurements, such as a circuit for removing noise from the output signal, a circuit for compensating for temperature differences, etc. Some devices are removably installed on a stand. According to such a sensor module, each part of the detection circuit can be determined by looking at the electrical components and printed wiring installed on the board, or by connecting an oscilloscope or the like to each part of the circuit and observing the signal waveform. You can learn about its functions and functions.

Problems to be Solved by the Invention However, in such conventional sensor modules, the detection circuit and sensor provided on the board are exposed, making it inconvenient to handle and store when installing and removing the sensor module, and causing damage to circuit components. There was a problem.

The present invention has been made against the background of the above-mentioned circumstances, and its purpose is to provide a sensor module that is easy to handle and store, and with less damage to circuit parts, etc., without impairing the workability of practical training related to detection circuits. It is about providing.

Means for Solving the Problems In order to achieve the object, the present invention has a substrate provided with a sensor and a detection circuit for the sensor, which is removably disposed on a measurement stand, and which is measured by the sensor. A sensor module for sensor training in which the sensor is learned while changing a physical quantity of the sensor, the sensor module comprising: (a) a holding plate to which the substrate is attached face up by a plurality of screws made of a material that is attracted to a magnet; and (b) A magnet is provided at a position corresponding to the screw, and the magnet attracts the screw so that the transparent cover is removably attached to the front side of the substrate and covers the substrate and the sensor. do.

Function and Effects of the Invention According to this sensor module for sensor training,
The board on which the detection circuit and sensors are installed is attached to the holding plate and covered with a transparent cover, so there is no risk of touching the circuit components or sensors when attaching or removing them from the measuring table or when storing them. This makes handling and storage easier without damaging them.

In particular, since the cover is attracted by a magnet, it does not come off easily, and the circuit components and sensors are well protected. Moreover, since the magnet is designed to attract the screws used to attach the board to the holding plate, the structure is simpler and cheaper than when a magnet etc. is also provided on the holding plate side. be.

On the other hand, since the above cover is transparent, you can learn about the detection circuit by looking at the circuit components and sensors installed on the surface of the board, and you can also learn about the functions of each part of the detection circuit by removing the cover and connecting an oscilloscope etc. Being able to learn the functions etc. is the same as in the past, and covering the board with a cover does not interfere with sensor training at all.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a partially cutaway perspective view of the sensor training device, in which a measuring table 10 is provided with a sensor installation section 12 and a moving table 14. The sensor arrangement section 12 is formed by a pair of side walls 16.18 and a rear wall surface 20.
It is composed of a rectangular recess that opens forward and upward, and a rectangular sensor module 2 is installed in the recess.
2 can be removably inserted. Further, on the rear wall surface 20, there are processing devices such as a power supply for sensors and a microcomputer built into the measuring table 10.

A female connector 24 connected to connection jacks 23 and the like arranged on the top surface of the measuring table 1O is buried, and when the sensor module 22 is pushed rearward into the recess, the sensor module 22 is inserted into the recess. It is designed to be connected to a male connector 26. Thereby, the sensor module 22 is positioned at a predetermined position. The processing device processes the signal supplied from the sensor module 22 according to a predetermined program, and outputs it to an external device interface to which an external device such as a personal computer is connected.

The sensor module 22 measures distance using ultrasonic waves and includes a substrate 28 shown in FIG.

This board 28 includes a transmitter 30 that emits ultrasonic waves, a receiver 32 that receives reflected waves, and a detector that drives the transmitter 30 and amplifies the output signal output from the receiver 32. A circuit 34 is provided. Said transmitter 30 receiver 32. Various electrical components 36 of the detection circuit 34 are arranged on the front surface of the board 28, and are connected by printed wiring provided on the back surface.
A circuit diagram of the detection circuit 34 is printed on the surface of the sensor by silk printing or the like in correspondence with the electrical components 36. The transmitter 30 and receiver 32 correspond to sensors.

In addition, the printed circuit diagram also describes the types and standards of the electrical components 36, and wires 37 connected to the printed wiring are connected to predetermined test points and grounding points. It is pulled out in a shape. The test point is set at a location in the detection circuit 34 where it is important to observe the signal waveform etc. in order to understand its function and working, and the test point includes rTPIJ.
, 'TP2J (not shown), rTP3. In addition, the letters ``GNDJ'' are written on the grounding point.In addition, on the surface of the board 28,
The letters ``ultrasonic sensor'' indicating the type of sensor, the letters ``transmission J, ``receiving'' indicating the transmitting side and the receiving side, etc. are written.

The board 28 also includes the male connector 26.
The detection circuit 34 is connected to the contacts of the male connector 26, and is connected to the sensor power supply, processing device, connection jack 23, etc. built into the measuring table 10 via the female connector 24. be done. As a result, necessary power is supplied from the sensor power supply, and the detection circuit 34
From there, a measurement signal corresponding to the output signal output from the receiver 32, a timing signal when emitting ultrasonic waves, a signal from the part where the wire 37 is drawn out, etc. is sent to the processing device, the connection jack 23, etc. Supplied. In the vicinity of the connection junk 23, symbols such as "rTPl" corresponding to test points 1 to 1 from which the wire 37 is drawn out are written. Note that up to eight test points can be set, which is the same as the number of connection jacks 23 excluding rGNDJ.

3 and its IV.
As shown in FIG. 4, which shows the -IV cross section, it is housed in a case 38 made of synthetic resin such as acrylic resin. The case 38 is composed of a flat holding plate 40 having a rectangular shape between the board 28 and the path, and a transparent cover 42 also having a rectangular shape. It should be mounted face up on the 40. The screws 44 are all made of iron and fix the substrate 28 and the holding plate 40 at the four corners of the substrate 28, but only two are shown by cutouts in FIG.

The cover 42 has a container shape, and its opening is fitted to the peripheral edge of the holding plate 40 to cover the front side of the substrate 28, and has four locations corresponding to the screws 44. A cylinder 46 is provided, and a magnet 48 is embedded in the lower end thereof, and the magnet 48 is removably fixed to the holding plate 40 by attracting the screw 44. Fitting protrusions 50 are provided on the peripheral edge of the holding plate 40 and the opening of the cover 42 to fit into each other.
52 and said transmitter 30 . of cover 42 . Openings 54 and 56 are provided in the portion corresponding to the receiver 32.
is formed. A notch 5860 is formed in the rear part of the holding plate 40 and the cover 42, that is, in the upper right part in FIG. is provided with a notch 61 on which to place one's finger when removing the cover 42. In FIG. 3, FIG. 4, and FIG. 1, the electrical components 36 and the like on the board 28 are omitted.

Note that the above description relates to the sensor module 22 that measures distance using ultrasonic waves, but in addition, there are thermocouples and thermistors that measure temperature, and C that measures light.
Various sensor modules are prepared in advance, such as dS cells, photodiodes, color sensors that identify colors, strain gauges that measure strain, Hall sensors and eddy current sensors that measure magnetism, and infrared sensors that measure infrared rays. Although not shown in the drawings, these sensor modules are ones in which a board provided with a sensor and a detection circuit is housed in a case in the same way as the sensor module 22 mentioned above.
It is used by being removably installed in the sensor installation section 12 of the sensor.

Returning to FIG. 1, the moving table 14 has a slider 62
Fixed. The lower end of the slider 62 is connected to the measuring table 1
It is slidably fitted into a dovetail groove of a block 64 fixed to the sensor module 22, and is supported so as to be movable in the left and right directions toward and away from the sensor module 22. Further, a rack 66 is fixed to the lower surface of the slider 62, and a manual knob 6B
It is meshed with a pinion 70 disposed on the shaft of. The shaft of the manual knob 68 is supported rotatably around the axis by the Bronco 4.
The slider 62 and further the moving table 14 are moved linearly in the left and right direction by the rotation operation.

Further, as is clear from FIG. 5 and FIG. 6 showing a cross section of A rubber magnet 74 is attached to the reflective plate 7.
6 is arranged to be detachable. Reflector plate 7
6 is screwed to an iron plate 7 having the same square shape as the recess 72, and is positioned by fitting the plate 78 into the recess 72, and is attracted to the rubber magnet 74. It is removably attached.

The reflecting plate 76 is a measurement target for changing the physical quantity, that is, distance, measured by the sensor module 22, and there are multiple types of measurement targets in advance corresponding to the plurality of types of sensor modules described above. Provided. For example, a Hall sensor can measure a magnet, a strain gauge can measure a press pin that contacts and deforms the strain gauge, a thermocouple or thermistor can measure a dryer, a CdS cell or a photodiode can measure something. Light bulbs and the like are prepared, and each is arranged on the movable table 14 via an iron plate.

Next, the operation of the sensor training device configured as above will be explained.

First, a desired one is selected from a plurality of types of sensor modules prepared in advance and set in the sensor module 12, and a measurement target corresponding to the sensor module is set in the moving table 14. . When setting the sensor module, insert the lower end of the sensor module into the recess of the sensor installation part 12 with the male connector positioned at the rear, and then push it backwards to insert the male connector into the rear wall surface 20. When setting the object to be measured, the iron plate to which the object to be measured is attached is inserted into the recess 72 of the moving table 14 and is attracted to the rubber magnet 74. Just let it happen. FIG. 1 shows a state in which the sensor module 22 of the ultrasonic sensor and the reflector 76 that is the object to be measured are set.Hereinafter, an example of how to use the sensor training device in the case of sensor training on the ultrasonic sensor will be described.

After the sensor module 22 and the reflection plate 76 are set on the measurement stand 10 in this manner, the power switch 88 provided on the measurement stand 10 is turned on. This results in
Power is supplied to the detection circuit 34 of the sensor module 22, ultrasonic waves are emitted from the transmitter 30, and the reflected waves reflected by the reflector plate 76 are received by the receiver 32. The output signal output from the receiver 32 is amplified by the detection circuit 34 and then supplied as a measurement signal to a processing device built in the measurement table 10 via the connectors 26 and 24. The processing device is also supplied with a timing signal for emitting ultrasonic waves, and after processing these signals according to a predetermined program, it is sent to an external device such as a personal computer connected to an external device interface. Output to. As a result, the transmitted and received ultrasonic waveforms are displayed on the external device, and in this state, the manual knob moves the table 1.
4 and observe changes in their waveforms, and learn that distance can be measured from the relationship between the position of the reflector plate 76 and the waveforms.

In addition, since a circuit diagram of the detection circuit 34 is printed on the surface of the substrate 28 of the sensor module 22 in correspondence with the electrical components 36, the measurement circuit 34 can be learned by looking at the circuit diagram, the electrical components 36, etc. be able to. Also, cover 4
2 and pulled out the wire 37 onto the board 28.
The function of each part of the detection circuit 34 can be determined by extracting the signal of the test point from the terminal or by extracting the signal of the test point from the connection jack 23 provided on the top surface of the measuring table 10 and displaying the signal waveform on an oscilloscope or the like. You can also practice on functions, etc.

As described above, according to the sensor training device of this embodiment, a desired sensor module is selected from among a plurality of types of sensor modules and arranged in the sensor arrangement section 12 of the measurement table 10, and the sensor module is By simply placing a corresponding measurement target on the moving table 14, learning regarding that sensor can be performed. Furthermore, by replacing the sensor module and the object to be measured, it is possible to practice using a plurality of types of sensors using -10 measurement stands 10.

On the other hand, the sensor module 22 of this embodiment has a detection circuit 3
4 and transmitter 30. Since the board 28 on which the receiver 32 is installed is housed in the case 38, there is no possibility of damaging the electrical components 36 etc. by touching them with your hands when attaching or detaching them from the measuring table 10 or during storage. This makes handling and storage easier. In particular, since the cover 42 of the case 38 is attracted by the magnet 48, it does not easily come off, and the electrical components 36 and the like are well protected. Furthermore, since the magnet 48 is adapted to attract the screw 44 for attaching the board 28 to the holding plate 40, the structure is simpler and cheaper than when a magnet or the like is provided on the holding plate 40 side as well. It can be configured as follows.

Furthermore, since the cover 42 is transparent, you can learn about the detection circuit 34 by looking at the electrical components 36 and circuit diagrams on the board 28, and you can also learn about the detection circuit 34 by removing the cover 42 and connecting an oscilloscope or the like. The ability to learn the workings and functions of each part is the same as in the past, and the fact that the board 28 is housed in the case 38 does not interfere with sensor training at all.

Note that the same applies to other sensor modules.

Although one embodiment of the present invention has been described above in detail based on the drawings, the present invention can also be implemented in other embodiments.

For example, in the embodiment described above, signal waveforms, etc. are displayed on an external device, but it is also possible to integrally incorporate a cathode ray tube, a recording device, etc. into the measuring table 10 for display, recording, etc. .

Moreover, conversely, the processing device built into the measuring table 10 can also be provided in an external device or the like. However, depending on the sensor, a processing device may not necessarily be necessary.

It is also possible to provide a sensor for detecting the position of the moving table 14 and display and record the distance to the measurement target together with the measurement results.

Further, in the embodiment described above, the moving table 14 is moved manually, but it may be moved automatically using an electric motor or the like.

Furthermore, the measurement target does not necessarily need to be placed on the moving table 14 and moved; in the case of a sensor module that measures temperature, light, etc., the measurement target may be changed by changing the temperature or brightness of the heat source or light source. Also good.

Further, in the embodiment described above, a circuit diagram is drawn on the board 28, and loop-shaped wires 37 are provided at predetermined test points, but these are not necessarily necessary. In particular, in the embodiment described above, since the connection jack 23 is provided to be connected to each test point, omitting the wire 37 has no effect at all as long as the test points are displayed.

Although other examples are not provided, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a sensor training device to which a sensor module according to an embodiment of the present invention is attached. 2 is a perspective view showing the substrate of the sensor module of FIG. 1. FIG. 3 is a partially cutaway perspective view of the sensor module of FIG. 1. FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a partially cutaway perspective view showing a state in which a reflector is disposed on the moving table of the apparatus shown in FIG. Figure 6 shows Vl-V in Figure 5.
1 is a sectional view. : Measuring table 2 board: Receiver (sensor) : Holding plate: Screw 22 : 30 = 34 : 42 : 48 ; Sensor module transmitter (sensor) Detection circuit magnet

Claims (1)

[Scope of Claims] Sensor training that includes a sensor and a board provided with a detection circuit for the sensor, is removably disposed on a measurement stand, and learns about the sensor while changing the physical quantity measured by the sensor. A sensor module for use in a sensor module, comprising: a holding plate to which the substrate is attached face up by a plurality of screws made of a material that is attracted to the magnets; and a magnet at a position corresponding to the screws, the magnet attracting the screws. A sensor module characterized in that it has a transparent cover that is detachably attached to the front side of the substrate and covers the substrate and the sensor.