JPS6022797B2 - Physical quantity distribution display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a physical quantity distribution display device for sequentially detecting the distribution of physical quantities by arranging a plurality of physical quantity-to-electrical converters in a grid pattern matrix, and particularly relates to a physical quantity distribution display device for sequentially detecting the distribution of physical quantities. This invention relates to a seat pressure gauge that measures seating comfort, etc.

With the recent development of automobiles, various considerations are being made regarding comfort, and one of the factors that determines comfort is the comfort of sitting on a car seat.

In order to measure and study this seating comfort, it is necessary to accurately determine the dynamic situation of the distribution of body pressure exerted by the passenger on the seat when the passenger is seated in the car seat and the car is running. It is necessary to understand. Conventionally, as a device for detecting this type of dynamic change in seat pressure that changes from time to time at multiple points, and for obtaining the detected dynamic change in seat pressure as easy-to-understand data in real time, the seat pressure meter shown in Fig. 1 has been used. be.

The seat pressure gauge uses a number of transducers placed on the surface of the seat of a car that touches the passenger's body to convert the seat pressure applied from the passenger's body to the seat surface into an electrical signal when the passenger is seated. Part A, a signal processing circuit part B that appropriately processes the converted electric signal, and a CRT (
It consists of a display section C that displays on the screen with brightness modulation.Using this seating pressure meter, you can directly see the sitting pressure distribution in real time, which increases the human intuitive judgment ability.
It is easy to deal with problems such as eling, and allows for efficient and effective research on seating comfort, etc., and is of great practical utility.

By the way, in the above-mentioned seat pressure gauge, the pressure-to-electricity converter has a transducer arranged on the surface of the seat cushion and seat back of the seat in a checkerboard pattern at equal intervals, and is fixed with an adhesive such as rubber glue. The lead wires of each transducer are led out and concentrated on the back side of the sheet, and the power supply lines and signal lines are wired so that adjacent transducers are connected in parallel with each other.
Once installed on the seat to be measured, it is very difficult to remove it, and when measuring the seating comfort of another seat, it is necessary to install a new one, making installation and removal very inconvenient.

Suppose that the wiring for the transducer Even if you try to measure the seating pressure distribution of a seat by installing it on the top, the transducers of the pressure-to-electrical converter are connected in parallel to the power supply, so there are many power supply lines to be installed between each transducer. Moreover, since the output signal of each transducer is output through an independent signal line, the number of signal lines drawn out to the outside increases in proportion to the number of transducers arranged. In addition to differences in seating pressure distribution due to differences in seat shape, material, etc., the rigidity of the power supply line and signal line of the pressure-to-electrical converter is included as an external factor in the measurement results, so it is difficult to accurately determine the seat pressure distribution. This was a difficult problem to solve as it was not possible to grasp the dynamic seating pressure distribution.

The present inventors aim to overcome the above-mentioned problems. The horizontal arrangement of the pressure-electricity conversion network according to the present invention is very simple and easy to manufacture, and in particular, since the number of power supply sources and signal lines is extremely small, the transducers can be arranged at multiple points in a checkerboard pattern. When measuring the dynamic seating pressure distribution when seated by placing a net made of connected wires on the top of the seat to be measured, the rigidity of the pressure-electricity conversion network can be made extremely small. The smoothness and flexibility of the upper surface of the seat are not significantly compromised, and it is possible to measure conditions close to the original characteristics of the seat without causing any discomfort to passengers. It has the feature that it can be attached to the seat where it should be placed.

The present invention will be described below with reference to FIGS. 2 to 9, focusing on embodiments of a seat pressure gauge.

As shown in Figure 2, the seat pressure gauge of this embodiment has a large number of transducers placed on the upper surface of the seat of an automobile, etc. that touches the passenger's body, and measures the body pressure applied from the passenger's body to the seat surface when the passenger is seated. A pressure-to-electrical conversion network 1 that converts and outputs electrical signals, a signal processing unit 2 that sequentially extracts and processes the electrical signals converted by the pressure-to-electrical conversion network 1, and displays the output signals of the signal processing unit 2. It consists of a display section 3.

The transducers S arranged in a checkerboard pattern on the pressure-electricity conversion network 1 include a thin plate-shaped diaphragm 5 and a base 6 that supports the diaphragm 5, as shown in FIGS. 3 to 6.
and a lead section 7 for extracting electrical signals from the diaphragm 5.
and a protection part 8 that protects the diaphragm 5.

The thin plate-like diaphragm 5 is cut out from a single crystal of n-type silicon, and is made of a rectangular thin plate with flat upper and lower surfaces.

A P-type silicon layer is integrally formed in a predetermined pattern on the upper plane of the thin plate-like diaphragm 5 by selective diffusion. Further, a rectangular recessed portion is provided on the lower surface of the thin plate-like diaphragm 5 opposite to the surface on which the P-type silicon layer formed in a predetermined pattern is formed, and this portion is formed as the garden strain region 9 of the diaphragm 5. be.

That is, a central strain sensing element 10 is formed in the center of the rectangular super strain area 9 on the thin plate-shaped diaphragm 5, and a central strain sensing element 10 identical to the central strain sensing element 10 is provided near the periphery of the strain generating area 9. A shaped external strain sensing element 11 is formed, and the strain sensing elements 10, 11 and the signal transmission section 12 are integrally connected and formed at the same time by a selective diffusion method or the like, so that each strain sensing element 10,
A half-bridge circuit having sides 11 is formed to correspond to the circuit configuration in which the output of the bridge circuit is to be transmitted to the signal transmission section 12.

Furthermore, the central strain sensing element 10 and the outer strain sensing element 1
1 is connected to the strain region 9 via a signal transmission section 12.
Externally, aluminum is connected to three strip-shaped electrode portions 13 formed near the edge of the thin plate-like diaphragm 5 by a vacuum bonding method.

The peripheral green part of the thin plate-shaped diaphragm 5 is supported and fixed on the lower base body 6 with silicone rubber 14, and the non-fixed part, a rectangular super-strained region, is configured as a flexible part that deforms under pressure, and the strain-generating region is formed. Strain sensing element 10 integrally formed on top
, 11 are adapted to produce electrical signal changes based on piezoresistive effects that are proportional to the magnitude of strain in the strain-generating region that is more distorted than the magnitude of pressure.

The lower base 6 supported and fixed on the back surface of the thin plate-shaped diaphragm 5 is formed into a band-shaped plate made of alumina ceramics, and both the upper and lower surfaces of the base 6 are flat, and the left tip in FIG. A through hole 15 is formed in the center of the top surface of the base body 6 and communicates with the side surface of the base body 6. The long axis of the thin plate-shaped diaphragm 5 is aligned with the center of the long axis of the base body 6 so as to cover the region 9, and is fixedly locked.

On the surface of the base 6, there is a protective portion 8, an annular lid 16 formed of an insulating material such as ceramic, with its bottom portion facing the surface of the base 6, and the annular center of the lid 16 extending beyond the thin plate diaphragm 5. A light-shielding film 17 made of aluminum foil or the like is fixed with a synthetic adhesive so as to face the strained region 9 at approximately the same distance D, and in the lid 16 covers the strained region 9 of the thin plate-like diaphragm 5 with silicone rubber. A part of the silicone rubber bulges out in an arc shape from the upper entrance part of the lid body 16, and this part serves as a contact pressure receiving surface.

Further, there is a lead part 7 at the rear end on the right side in FIG.
The lead portion 7 has three lead wires 19a, 19b, 19.
Two diodes 20 and 21 connected in the same direction as c are fixed electrically insulatingly to each other on the upper surface of the base 6 with a synthetic adhesive, and a strain sensing element is arranged on the upper surface of the thin plate-shaped diaphragm 5. The positive input terminal 22 and negative input terminal 23 of the terminals 10 and 11 and the two diodes 20 and 21 are connected to form a half bridge circuit shown in FIG. Connection point 24 of elements 10 and 11
is set as the output terminal 19b.

Therefore, the three lead wires 19a, 19b,
At the outer tip of 19c are connector pinisos 19d, 19e,
19f is arranged, and the pressure-electricity conversion network 1 described later
The bag is designed to flow into the power supply line and signal line of the By the way, the above-mentioned transducer S is designed to withstand external pressure of lk9 or more so that it will not be damaged even if it is pushed by a finger or a hard object, and the transducer S will not feel strange even when the passenger is seated. The size of the transducer used in this example was 1 length, 13 sides, and 2 sides. The above-mentioned transducer S is connected to the pressure-electricity conversion network 1 as shown in FIG.
The surfaces of the power supply lines 25, 26 and the signal line 27, which are added to the negative power supply line 26 and the signal line 27 and which are also wired to the pressure-to-electricity conversion network 1, are made of synthetic resin having electrical insulation properties. A conductor wire that is coated with
A connector is attached to the connection point for connecting the transducer described above, and the connector pins 19d, 19e, 19f of the transducer S are connected to the connector to connect the transducer to the pressure-electricity conversion network 1. <It has been done.

That is, the anode 19a of one of the diodes 20 of the five transducers S, S2, S3, S4, and S5 in the first row is connected to the electric path 27a of the positive power supply line 25 of the pressure-electricity conversion network 1 described above. 5 transducers S6 in the second row are connected to the lightning line 28 of the positive power supply line.
S7, S8, S9, S. The anode 19a of one of the diodes 20 is connected.

And the positive power supply joint line. The electric line 29 includes five transducers S, . ,S,2,S,3,
The anode 19a of one of the diodes 20 of S, 4, S, 5 is connected, and the positive power supply line 25 is connected to the five transducers S, 6, S, 7, S in the fourth row. ,8,
The anode 19a of one of the diodes 20 of S, 9, and S2o is connected. In addition, the four transducers S, S6 in the first row are connected to the electrical circuit 31 of the negative power supply connection line 26.
,S,. , S, 6, the cathode 19c of the other diode 21
is connected, and the four transducers S, , S7, S, 2, S, 7 in the second row are connected to the electric line 32 of the negative power supply line for 8 units.
The cathode 19c of the other diode 21 is connected.

The electric machine 33 of the negative power supply V feed line 26 has four transducers S3, S6, S, 3,
The cathode 19c of the other diode 21 of S,8 is connected,
4 in the fourth column for the electrical circuit 34 of the negative power supply line 26.
The cathodes 19c of the other diodes 21 of the transducers S4, S9, S, 4, S, 9 are connected. Furthermore, in the dragon route 35 of the negative power supply V feed line 26, there is a 4 in the fifth column.
transducers, S. , S, 5, and S2o are connected to the cathode 19c of the other diode 21. On the other hand, four transducers S. ,S7,S,3,S≠
, 9 are connected, and 4 is connected to the electrical circuit 37 of the signal line 27.
The output terminals 19b of the transducers S2, S8, S,4, and S2o are connected.

The lightning path 38 of the signal line 27 has four transducers S3, S9, S. The output terminals of 5, S, and 6 are connected, and four transducers S4,
S,o,S,. , S, 7 are connected to the output terminals 19b.
Furthermore, the output terminals 19b of four transducers S5, S6, S, 2, S, and 3 are connected to the electric path 40 of the signal line 27, and the signal line 27 has four transducers as a set and one signal. It is intended that a plurality of transducers can be shared in a line. The output of each transducer is such that a voltage signal proportional to the external pressure is outputted via the signal line 27 only when the voltage from the power supply lines 25 and 26 is applied in the forward direction to each transducer. be. Therefore, for example, when detecting the pressure applied to the transducer S as an electrical signal, the pressure -
When an electric signal is supplied to the dragon path 27a of the positive power supply line 25 and the open path 31 of the negative power supply line 26 of the electrical conversion network 1, the output signal of the transducer S is transmitted through the crab path 36 of the signal line 27. In addition, when detecting the pressure applied to the transducer S2 as an electrical signal, the open circuit 27a of the positive power supply line 25 of the pressure-electricity conversion network 1 and the electrical circuit 32 of the negative power supply line 26 When an electrical signal is supplied to the transducer S2, the output signal of the transducer S2 is outputted through the crab path 37 of the signal line 27, and the other transducers are similarly operated.
Sequentially connect each transducer to two crab source lines 25, 2.
6, the output of the designated transducer can be outputted via the designated signal line, and the relationship between the above-mentioned power supply line, each transducer, and the signal line is as shown in FIG.

In the figure, the vertical axis shows a time chart of each crab source supply line and signal line, and the horizontal axis shows a time chart of each transducer. The level indicates a state in which no voltage is applied or there is no output.

Thus, the positive power supply line 25, the negative power supply combination line 26, and the signal line 27 of the pressure-electricity conversion network 1 are connected to the signal processing section 2.

The signal processing section 2 is a circuit that sequentially extracts signals, and includes two power supplies 41, 42, three changeover switches 43, 44, 45, an input terminal 46, and first, second, and third output terminals 47, 48.
, 49.

That is, the four terminals 47a of the first output terminal 47 are
The common terminal 43b of the first changeover switch 43 is connected to the changeover terminal 43a of the first changeover switch 43.
It is connected to the positive pole 41a of No. 1. Further, the five terminals 48a of the second output terminal 48 are respectively connected to the switching terminals 44a of the second changeover switch 44, and the common terminal 44b of the second changeover switch 44 is connected to the negative pole 42a of the power source 42.
The power source 41 and the power source 42 are connected in series, and a connecting point 50 thereof is grounded. and,
The five terminals 46a of the input terminal 46 are respectively connected to the changeover terminals 45a of the third changeover switch 45, and the common terminal 45b of the third changeover switch 45 is connected to the third output terminal 49. , the first and second output ends 47, 48 and input end 46 of the signal processing section 2 are connected to the positive power supply line 25 and the negative power supply line 26 of the pressure-to-electricity conversion network 1, respectively, and The signal is transmitted to the pressure-electricity conversion network 1 and the output terminal 4 of the signal processing section 2
9 to the display unit 3, and the specified pressure-electricity conversion network 1
The signal from the transducer is to be displayed.
The display unit 3 includes a DC voltmeter 51 that displays input signals.
The DC voltmeter 51 displays the input DC voltage in an analog manner, and the display of the DC voltmeter 51 has equally spaced scales that are engraved with applied force, and there is also a scale switch that allows you to expand the scale range at any time. The input 51a of the DC voltmeter 51, which is a convenient meter equipped with a switch, is connected to the output terminal 49 of the signal processing section 2 at the previous stage.

The seat pressure gauge of this embodiment achieves the following effects by having the above-described configuration.

When the pressure-electricity conversion network 1 in which the transducer of the embodiment is arranged is placed on the upper surface of the seat to be measured, and the passenger is seated on it, the dynamic body pressure of the passenger against the seat during driving will be the pressure. It is transmitted to each transducer S arranged at a corresponding part of the shock conversion network 1, and in the strain-generating region of the transducer, a strain is generated according to the body pressure of the passenger to be measured, and the tensile force and compressive force of the strain are A state is reached in which it can be converted into an electrical signal proportional to the magnitude of strain based on the piezoresistive effect of the two strain gauges.

Therefore, by operating the first, second, and third changeover switches 43, 44, and 45 of the signal processing section 2, the pressure-electricity is transmitted through the positive power supply connection line 25 and the negative power supply connection line 26. Each transducer placed on the conversion silk 1 is designated in sequence, and the output signal of the designated transducer is sequentially input to the DC voltmeter 51 of the display meter 3 via the designated signal line 27. By the way, the transducer disposed in the pressure-electricity conversion network 1 of the embodiment pressure gauge has a rectangular strain area 9 of the thin plate diaphragm 5, so that the effective area of the strain area 9 formed in the thin plate diaphragm 5 is can be secured in a larger area within the thin plate diaphragm 5 than the conventionally used circular strain area 9. Even though the strain area 9 is extremely small, the output sensitivity to strain is extremely high and the response is good, so the entire transducer It can be configured to be ultra-compact and ultra-thin, and therefore, it can be used even on the streamlined curved surface of the seat, which is the measurement surface, with a complex curvature. do not have.

In addition, in the pressure-electricity conversion network 1 of the embodiment, two diodes 20 and 21 are additionally connected in the forward direction to the input terminals 22 and 23 of each transducer S, so they are arranged in a grid pattern matrix. Among the plurality of transducers S, only the output signal of a designated transducer can be outputted via the shared signal line 27 without interference from the output signals of other transducers. It is not necessary to make the output of each transducer independent as seen in the pressure-to-electrical conversion network 1, and the number of signal lines 27 can be significantly reduced compared to the conventional number.

This means that the signal lines 27 can be drawn out evenly from the periphery of the pressure-to-electricity conversion network 1, and as seen in the conventional pressure-to-electricity conversion network 1, the signal lines 27 can be drawn out evenly from the periphery of the pressure-to-electricity conversion network 1. There is no overlap in concentration around 1.

Therefore, in the pressure-electricity conversion network 1 of this embodiment, the neck. Even if the upper surface of the seat is fixed to the seat, the influence of the stiffness due to the duplication of the signal line 27 of the pressure-electrical conversion network 1 is almost eliminated, so at the time of detection, it is possible to board the seat in a state almost similar to the actual state. It is possible to detect the dynamic pressure distribution of people. Furthermore, since the total number of power source lines 25, 26 and signal lines 27 is small, installation on the seat is very simple, and electrical troubles such as disconnections and incorrect connections can be minimized.

In addition, the pressure-electricity conversion network 1 has a net shape in which a plurality of transducers S are wired with flexible power supply lines 25, 26 and signal lines 27, so it is easy to install and carry, and it is easy to carry out measurements. It can be easily attached to the upper surface of another seat, and can be sufficiently adapted to the curved surface of the upper surface of the seat.

Furthermore, since the pressure-to-electricity conversion silk 1 is provided with a connector for attaching a transducer, if the transducer is damaged or has different characteristics, it can be easily replaced.

Therefore, the electric signal input to the DC voltmeter 51 is indicated as a pressure force, and from this indicated value, the body pressure acting on the sheet in each area section arranged in a checkerboard pattern can be detected.
Therefore, it is possible to grasp the dynamic sitting pressure when sitting on the seat to be measured.

Here, we will introduce a part of an example in which the seating pressure of a car seat was detected using the seating pressure gauge of this embodiment, as shown in FIG. 10.

FIG. 10 shows the seating pressure applied to each transducer on the seat surface in terms of evening/ground. From this result, areas where the seating pressure is large and areas where it is small can be clearly displayed numerically.

In this way, the seat pressure gauge of this embodiment can automatically express the passenger's body pressure against the seat quantitatively and numerically, so it is a very convenient and useful device when functionally clarifying the seat pressure. be.

By the way, the seat pressure gauge of the above embodiment is very convenient for expressing the seat pressure when seated in a quantitative numerical value and for functionally clarifying the seat pressure classification. I was just looking for an element.

In other words, the seat not only has the role of accommodating the passenger, but also absorbs as much external shock as possible during driving, and allows the passenger to drive comfortably even when seated for long periods of time without causing any pain. It has one major dynamic function: it adheres appropriately to the passenger's body and always holds the passenger in a fixed position with an appropriate upward force.

Therefore, if the dynamic seat pressure distribution during seating can be clearly understood in a comprehensive manner, a more reliable seat evaluation can be made. This is in response to a request.

The seat pressure gauge of the second embodiment automatically sequentially extracts signals from a pressure-electrical conversion network 52 in which transducers for detecting body pressure are arranged in a grid pattern of 1 to 15 rows, and the pressure-electrical conversion network 52. , a signal processing section 53 for processing, and a display section 54 for converting the signal from the signal processing section 53 into a signal corresponding to accurate body pressure and displaying the signal as a sitting pressure distribution. It is of great practical utility as it allows the sitting pressure distribution to be directly observed in real time, allowing for efficient and effective experiments and research on seating comfort, etc., without the hassle of organizing and charting the measured data.

The seat pressure gauge of the second embodiment will be explained below with reference to FIG. Since this is just a design change of the pressure-to-air pressure converter 1 of the manometer, the explanation will be omitted and the explanation will focus on the signal processing section 53 and the display section 54.

The signal processing section 53 is a circuit that transmits an electric signal to the pressure-electricity conversion network 52 and sequentially processes the output of the pressure-electricity conversion network 52. The clock circuit 55 of the signal processing section 53 internally controls the oscillator. The output terminal 55a is a circuit that generates a pulse signal of a constant frequency, and the output terminal 55a is connected to a preset circuit 56.
Connect to.

The preset circuit 56 is a circuit that counts input pulse signals, outputs them from an output terminal, and stops counting and outputting when a preset count value is reached.
The output terminal 56a of No. 6 is connected to the second drive counter 57 and the third drive counter 57.
It is connected to a drive counter 58 and a pulse waveform shaping circuit 59. The second driving counter 57 counts the input pulse signals and outputs them from the first output terminal 57a, and only when the counted value reaches 15 counts, the pulse signals are counted at the second output terminal 57b and the third output terminal 57c. This circuit outputs a predetermined pulse signal from the input terminal 57d of the circuit 57.
is connected to the output terminal 56a of the preset circuit 56,
The first output terminal 57a is connected to an electronic switch circuit 601.

The second output state 57b is the first drive counter 6.
1, and the third output terminal 57c is connected to the third drive counter 58. The third drive counter 58 is a circuit that temporarily pauses the counting of pulse signals input from the first input terminal 58a according to the signal input from the second input terminal 58b. connected to the output terminal 56a of the preset circuit 56;
The input terminal 58b of is connected to the third output terminal 57c of the second drive counter 57, and the output terminal 58c is connected to the analog switch circuit 62.

The pulse waveform shaping circuit 59 is a circuit that shapes an input pulse signal into an accurate pulse signal and outputs it.
The output terminal 59a is connected to the display section 54.

The electronic switch circuit 60 is a circuit that sequentially connects a second input terminal 60b and an output terminal 60c having 19 output terminals in accordance with a pulse signal inputted from a first input terminal 60a. The first input terminal 60a of the drive counter 60 is connected to the first output terminal 57a of the second drive counter 57, and the second input terminal 60b is connected to the negative power supply 63.

The output ends 60c are connected to the negative power supply line of the pressure-electricity conversion network 52. The first driving counter 61 is a circuit that counts pulse signals inputted from an input terminal 61a and outputs them from an output terminal 61b.
One input terminal 61a is connected to the second output terminal 57b of the second drive counter 57, and the output terminal 61b is connected to the electronic switch circuit 64.

The electronic switch circuit 64 is a circuit that sequentially connects a signal input to a second input terminal 64b to an output terminal 64c of a fixed output terminal according to a pulse signal input from a first input terminal 64a. 64 first input terminal 64a
is connected to the output terminal 61b of the first driving counter 61, and the second input terminal 64b is connected to the positive power supply 65.

The output ends 64c are each connected to the positive power supply line of the pressure-to-electricity conversion network 52. The analog electronic switch circuit 62 is a circuit that sequentially outputs signals input from 15 second input terminals 62b to an output terminal 62c in accordance with a pulse signal input from a first input terminal 62a.
The first input terminal 62a of the third drive counter 5
The second input terminal 62b is connected to the output terminal 66b of the ephemeris multiplier 66.

The output terminal 62c is connected to an analog waveform shaping circuit 67. The previous calendar intensifier 66 is a circuit that intensifies the input signal and outputs it, and the input terminal 66a of the circuit 66 is connected to the pressure -
The output terminal 66b is connected to the signal line of the electric converter 52, and the output terminal 66b is connected to the second input terminal 62 of the analog electronic switch circuit 62.
Connect each to b.

The analog waveform shaping circuit 67 is a circuit that increases the input signal to a predetermined size and integrates it.
The input terminal 67a of the analog electronic switch circuit 62
The output terminal 67b is connected to the output terminal 62c of the display unit 5.
Connect to 4.

The display section 54 is a circuit that displays input signals.
Converter 68, computer 69 and digital plotter 70
It becomes more. The A-D converter 68 has a first input terminal 68
A circuit that converts the signal input to the second input terminal 68b based on the signal input to the second input terminal 68b and outputs it.
The first input terminal 68a of the pulse waveform shaping circuit 59
The second input terminal 68b is connected to the output terminal 67b of the analog waveform shaping circuit 67.

The output terminal 68c is connected to an electronic computer 69. The electronic computer 69 is a device that performs addition and subtraction on input signals with preset values and then outputs them sequentially.The input terminal 69a of the computer 69 is connected to the output terminal 68c of the A-D converter 68, and the output terminal 69b connects to a digital plotter 70.

The digital plotter 70 is a device that sequentially prints and plots input signals, and the input terminal 70a of the plotter 70 is connected to the output terminal 69b of the computer 69.

Therefore, when the pressure-electricity conversion network 52 is mounted on the upper surface of the seat to be measured and the passenger is seated on it, the dynamic pressure distribution of the pressing force of the passenger against the upper surface of the seat is detected. First, the pulse signal output from the clock circuit 55 of the signal processing section 53 is input to the second driving counter 57 via the preset circuit 56, and counted by the circuit 57, and simultaneously output from the electronic switch circuit 60'. do.

The electronic switch circuit 60 sequentially connects the power supply 63 and one of the output terminals 60c of the electronic switch circuit 60, that is, the negative power supply line at the left end of the pressure-electricity conversion network 52 in the figure, according to the input signal. Then, when the count of the second drive counter 57 reaches 15 counts, a pulse signal is output from the second drive counter 57 to the first drive counter 61, and at the same time, the electronic switch circuit 60 outputs a pulse signal to the power supply 63. Switch the connection from the right end in the figure to the negative power supply line at the left end in the figure. The signal input to the first drive counter 61 is sent to the electronic switch circuit 64 via the output terminal 61b of the circuit 61.
This input signal moves the power supply 65 and the output terminal 64c of the electronic switch circuit 64, that is, the positive power supply line of the pressure-electricity conversion network 52 that is currently connected, to the next positive power supply line. Then, it is connected to the power supply line connected from the power source 65.

Therefore, in the pressure-electricity conversion network 52, the power source 63 and the power source 6
5 is supplied to the specified transducer by the specified positive power supply line and negative power supply line by the electronic switch circuits 60 and 64, and at the same time, the output of the transducer is supplied to the specified transducer via the specified signal line. The signal is input to a multiplier 66, where the signal is multiplied to a predetermined magnitude and output to an analog electronic switch circuit 62.

On the other hand, the clock circuit 55 simultaneously inputs the signal to the third drive counter 58 via the preset circuit 56, and the signal input to the third drive counter 58 is output to the analog electronic switch circuit 62. In the analog electronic switch circuit 62, the signal inputted via the front layer multiplier 66 and the signal inputted from the third drive counter 58 are inputted synchronously.

Therefore, based on the input signal of the third drive counter 58, the output signals from the front layer multiplier 66 are sequentially cut and simultaneously output to the analog waveform shaping circuit 67. The shaping circuit 67 amplifies the input signal to a predetermined magnitude, integrates the signal, and outputs the result to the display section 54. Furthermore, since the clock circuit signal is simultaneously input to the pulse waveform shaping circuit 59 via the preset circuit 56, the signal input to the pulse waveform shaping circuit 59 is shaped into a normal pulse waveform and output to the display section 54. do.

Therefore, the signal input to the display section 54 is that the input signal from the pulse waveform shaping circuit 59 and the input signal from the analog waveform shaping circuit 67 are synchronized with each other.
In the A-D converter 68 of No. 4, the gate of the A-D converter 68 is opened and closed based on the output signal of the pulse waveform shaping circuit 59, and the output signal of the analog waveform shaping circuit 67 is converted to the output signal of the analog waveform shaping circuit 67 in a timely manner. It is A-D converted and output to the computer 69.

In the computer 69, the output characteristics of each transducer arranged in the pressure-electricity conversion network 52 and the output signal before pressing are stored and set in advance. After comparing and calculating the input signal with the set value, the digital plotter outputs the data in sequence.

The digital plotter 70 prints and plots the input signals, and sequentially prints and plots the input signals from the computer 69. Therefore, the drawing of the digital plotter 70 automatically and accurately displays the output of each transducer arranged on the pressure-to-electricity transducer 52. Dynamic pressure distribution can be detected very easily. Here, we will introduce a part of an experimental example in which the seat pressure distribution of a car seat was detected using the seat pressure gauge of this embodiment, as shown in FIG. 13.

In the figure, the contour lines are displayed, but by referring to the contour line diagram, it is possible to clearly understand the detailed seating pressure distribution, and it can also be easily used for statistical processing and other various studies. It provides useful information.

As described above, the seat pressure gauge of this embodiment can comprehensively grasp the dynamic functions of the occupant in the car seat, and is therefore very useful for improving car seats and improving comfort and safety. In terms of applications, it will greatly contribute to industry.

Although the present invention has been explained based on the seat pressure gauge of the embodiment, it is not limited to this embodiment. For example, in the above embodiment, the two diodes additionally connected to the power supply terminal of each transducer are silicon diodes I manufactured by NEC.
S952 was used, but it is not limited to this diode, and any diode that has a reverse diode withstand voltage higher than the power supply voltage used can sufficiently perform its function, and can be replaced with a diode that is generally commercially available. It can be used satisfactorily even if used as is.

Further, in the above embodiment, in order to detect the dynamic pressure distribution of the passenger on the upper surface of the seat, two transducers are fixedly arranged in a checkerboard pattern in the pressure-to-electrical conversion network, and one transducer is arranged in five SI rows of 150 transducers. Although an example of the arrangement is shown, the present invention is not limited to this, and it goes without saying that the number of transducers and the wiring of the pressure-electrical conversion network may be changed in design as necessary.

Further, in the above embodiment, an example was shown in which the seat pressure and seat pressure distribution of a car seat were measured, but the present invention is not limited to this, and it is also possible to measure body pressure and body pressure distribution of a bed, etc. It goes without saying that this is true.

Furthermore, in the above embodiment, a transducer incorporating a semiconductor strain gauge was used to detect the dynamic sitting pressure distribution applied to the seat of a passenger in an automobile, but the sitting pressure distribution of the seat was evaluated as the object to be measured. Although all transducers are used, the present invention is not limited to this.

That is, when it is desired to detect the distribution of light on the surface of a certain object to be measured, it is possible to use a photoelectric element instead of the above-mentioned transducer.In other words, it can be used instead of a physical quantity-to-electrical converter that can detect physical quantities. It is also possible to use In summary, the present invention connects two resistance elements in series between one positive terminal and the other negative terminal, one of which increases and the other of which decreases in response to a change in a physical quantity. A plurality of physical quantity converters arranged in m rows and n columns with the connection points of as output terminals,
A positive power supply line consisting of m wires connected to the positive terminals of the n physical quantity-electrical converters arranged in each row via diodes connected in the normal direction, and m wires arranged in each column. A negative power supply line consisting of n wires connected through diodes connected in the forward direction to the negative terminal of the physical quantity-electrical converter, and The output terminals of the physical quantity-to-electricity converter are connected to signal lines so that the numbers are the same, and the number of the signal lines is the m positive power supply lines or the n negative power supply lines. Among the power supply lines, a physical quantity-electrical conversion network having the same number as the larger power supply line, m positive power supply lines of the physical quantity-electrical conversion network, and n
a signal processing unit that sequentially supplies power to the negative power supply line of the book in a time-sharing manner and sequentially extracts signals from the signal line of the physical quantity-to-electricity conversion network; and a signal processing unit that is connected to the output terminal of the signal processing unit. This is a physical quantity distribution display device characterized by comprising: a display section for displaying the output of the physical quantity distribution display device;

Now, when the physical quantity-electrical conversion network in the device of the present invention is attached to the upper surface of the object to be measured, the physical quantity applied to the upper surface of the object to be measured is transferred to the physical quantity-electrical conversion network arranged at the position corresponding to the part to which the physical quantity is applied. Each physical quantity-to-electrical converter is converted into an electrical signal corresponding to the physical quantity by each physical quantity-to-electrical converter.

Therefore, by sequentially supplying power from the signal processing unit to m positive power supply lines and n negative power supply lines of the physical quantity-electrical conversion network in a time-sharing manner, the physical quantity-electrical conversion Electrical signals corresponding to the physical quantities of each physical quantity-electrical converter arranged in the network are synchronously and sequentially taken out to the signal processing unit via the signal line, and the signals are processed and transmitted to the display unit, and the display Displayed by department.

Further, in the present invention, a transducer having a half-bridge configuration of pressure-electric conversion elements is arranged at multiple points in a checkerboard pattern, and two diodes are additionally connected in the forward direction to the input terminal of the transducer. When configured in a pressure-to-electrical conversion network, each transducer can operate as an independent element without being affected electrically by other adjacent transducers, and multiple transducers can use a common signal line. As a result, the total number of power supply lines and signal lines in the pressure-to-electricity conversion network can be extremely reduced.

Therefore, by visually observing the indicated value displayed on the display unit, it is possible to instantly and intuitively know the momentary change in the physical quantity on the upper surface of the object to be measured.

Therefore, the distribution of physical quantities for the object to be measured can be grasped functionally and dynamically functionally, making a great contribution to the field of measurement technology.

[Brief explanation of the drawing]

Fig. 1 is a connection diagram of a conventional pressure-to-electricity converter, Fig. 2 is a circuit diagram showing the first embodiment of the present invention, Fig. 3 is a partially cut-out plan view of the transducer, and Fig. 4 is the same. 5 is a plan view of the scalloped diaphragm of the transducer, FIG. 6 is a sectional view thereof, FIG. 7 is a connection diagram of two strain sensing elements and two diodes arranged in the transducer, and FIG. 8
The figure is an enlarged view of the pressure-to-electricity conversion network, Figure 9 is a time chart showing the relationship between the power supply line and signal line of the pressure-to-electricity conversion network and each transducer, and Figure 10 is for detecting the seat pressure of a car seat. Fig. 11 is a circuit diagram showing a second embodiment of the present invention, Fig. 12 is a wiring diagram showing a pressure-to-electricity conversion network of the second embodiment, and Fig. 13 is a seat pressure distribution of a car seat. An example of an experiment in which . In the figure, 1... pressure-electricity conversion network, 2... signal processing section, 3... display section, S... transducer, 5......・Thin diaphragm, 1
7... Light shielding plate, 20, 21... Diode, 25... Positive power supply line, 26.
...Minus power supply line, 27...Signal line, 27a, 28, 29, 30...Positive power supply line exposed circuit, 31, 32, 33, 34, 35...
・Kameji of the negative power supply line, 36, 37, 38, 3
9,40... Signal line Kameji, 43...
First selector switch, 44... Second selector switch, 45... Third selector switch, 52...
Sho car electrical conversion network, 53...Signal processing section, 54
...Display section. Figure 2 Figure 3 Rudder Chart Ship Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 12 Figure 13

Claims (1)

[Claims] 1 Connect two resistance elements in series between one positive terminal and the other negative terminal, one of which increases and the other of which decreases in response to changes in physical quantity, and connect the connection point of the two resistance elements to the output terminal. A line formed by connecting a plurality of physical quantity-to-electrical converters arranged in m rows and n columns, and diodes connected in the forward direction to the positive terminals of the n physical quantity-to-electrical converters arranged in each row is m. A positive power supply line consisting of a book,
a negative power supply line consisting of n wires connected through diodes connected in the forward direction to the negative terminals of the m physical quantity-to-electrical converters arranged in each column, and the physical quantity in one diagonal direction. - The output terminals of the physical quantity-electrical converters are connected to signal lines so that the number of electrical converters is the same, and the number of signal lines is equal to the m positive power supply lines or the m positive power supply lines or A physical quantity-electrical conversion network having the same number as the larger power supply line among the n negative power supply lines, m positive power supply lines and n negative power supply lines of the physical quantity-electricity conversion network. a signal processing unit that sequentially supplies power to a supply line in a time-sharing manner and sequentially extracts signals from the signal line of the physical quantity-to-electricity conversion network in a synchronous manner;
A physical quantity distribution display device comprising: a display unit connected to an output terminal of the signal processing unit and displaying the output thereof.