JPS58210534A - Pressure detector - Google Patents

Abstract

PURPOSE:To obtain a pressure detector of a small size and a low energy consumption type, by using a pressure detecting element having a pressure-capacity conversion characteristic and converting pressure to a digital value by using a C-MOS ring oscillator. CONSTITUTION:A capacitor 9 is used as a pressure detecting element having a pressure-capacity conversion characteristic. A water pressure detector 25 is constituted of a C-MOS ring oscillator 34 using a capacitor 9 as a charging- discharging capacitor in CR type oscillation in order to convert pressure, that is, the change in capacity value to a digital value, a programmable divider 36, a counter 37, a latch circuit 38, etc. If the operator now selects a dividing mode with a mode selection switch S0, the oscillator 34 oscillates and a block 39 for calculating water depth calculates water depth in accordance with the digital value changing according to the pressure exerted on the capacitor with the divider 36, etc. and displays the same on a display part 1b. The pressure detector of a small size and a low energy consumption type is thus realized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure detection device, and is suitable for use in a hydraulic pressure detection device suitable for being installed in small portable electronic devices for diapers, such as electronic watches for diapers, and other portable OT devices. The object of the present invention is to provide a pressure detection device suitable for being installed in a size measuring device, etc.

For example, in recent years, underwater diving such as so-called scuba diving and skin diving has become widely popular as a sport, and demand for watches for divers is increasing as one of the things that divers usually carry. However, conventional Daiper watches are simply water pressure resistant watches with a time display function, and for this reason, ordinary Daiper watches are actually equipped with a depth gauge, etc. on their wrists separately from the wristwatch. It is. Of course, the necessity of a watch for divers with a built-in depth gauge, etc. has long been heard, and if the watch could be equipped with a depth gauge, etc., the number of items carried by the diver would be reduced, making the watch less cumbersome. Although it is clear that a water pressure sensor equipped with a depth gauge has not been realized, the main reason is that a small and low-energy water pressure sensor suitable for being built into a diver's wristwatch has not been realized. This is because the equipment was not available.

The present invention can be installed in water pressure detection devices that are small enough to have low energy consumption and can be installed in small electronic devices such as electronic bowl clocks for dippers, and other portable measurement devices. The purpose of the present invention is to provide a pressure detection device that is relatively compact and consumes low energy to the extent that it is possible to do so.

-Below-Details of the present invention will be explained according to the figures. Figures 81 to 5 are diagrams showing one embodiment of the present invention.
FIG. 1 is a plan view showing the external appearance of an electronic watch for dialers equipped with a water pressure detection device according to an embodiment of the present invention. That is, the watch of this embodiment has one electronic optical display device.
It has an m-crystal display device 1, and one external operating member is a mode selection switch S. and a push button type switch such as a step-down switch S1.82. In addition, on the front side of the watch case 2, a buzzer °-6, a housing part 4 for a water pressure detection element,
A light emitting diode 6 and the like are attached, and the liquid crystal display device 1 includes a time display section 1a and an additional function display section 1b.

Next, FIG. 2 is a cross-sectional view showing the internal structure of the housing part 4 for the water pressure detection element. tied together. The holding member 8 has an insulating plate 8a airtightly connected to its lower portion, and a capacitor 9 functioning as a water pressure detecting element is disposed on the insulating plate 8a.

That is, the capacitor 9 includes a first polarization 91 formed on the insulating plate 8a, an elastic dielectric portion 96 disposed on the first solder 91, and a dielectric portion 96 between It consists of the first electrode 91 and a second electrode 92 facing each other, and these electrodes 1 are roughly covered with an insulating synthetic resin material 94 such as a thin nylon notebook to prevent dirt, etc. protected from. Note that $1, the second electrode 91
．． 924) A part of the through-hole portion formed in an airtight manner may be red and white so as to reach the lower surface side of the insulating plate 8a. In addition, a through hole 1 is provided at the outermost part of the holding member 8.
A protective plate 12 with a hole 2a is attached, and the protective plate 12 protects the condenser 9, which is a water pressure detection element, and prevents water from being introduced into the condenser housing space 10 through the through hole 12a during diving. The filter is configured such that water pressure can be applied directly to the condenser 9.

Furthermore, 16 is a circuit board, 1 and 4 are liquid crystal display device supporting members, and 15 is a connector made of a coil spring, and the connector 15 is connected to a predetermined wiring pattern (not shown) on the circuit board 16 and the first and second electrodes. 91.9zLJ) plays the role of electrically connecting some parts.

In the above configuration, when water pressure is applied to the capacitor 9, the elastic dielectric portion 96 is compressed according to the water pressure, and the distance between the first part 1 and the second part 91.92 is also reduced. As a result, the capacitance between the first and second electrodes 91 and 92, that is, the capacitance of the capacitor 9 also changes.

Next, FIG. 3 is a block diagram showing the outline of the circuit configuration of the clock of this embodiment, in which 16 is a crystal oscillation circuit, 17 is a frequency dividing circuit, 18 is a time system counter, and 19 is a calendar system counter. . Reference numeral 20 denotes an alarm memory for storing the alarm set time, and when the contents of the time counter 18 and the contents of the alarm memory 20 match, a coincidence detection signal C output from the coincidence detection circuit 21 is output. Accordingly, the alarm buzzer 3 is configured to be driven by the buzzer drive circuit 22.

On the other hand, the water pressure detection device 25 includes six detection elements including the aforementioned capacitor 9 as a detection element, and further includes a water depth calculation block 69 (to be described later) for converting water pressure values into water depth. When a depth of water greater than blood is detected, the light emitting/diode block 6 and buzzer drive circuit 22 are activated.
The device is configured so that a one-way Kurayoshi 1st digit a is supplied to the device so that the light emitting diode 6 and the buzzer 6 described above are driven. 824 is a clock signal forming circuit that forms each clock signal Ci to be supplied to the water pressure detection device 25 based on the signal from the frequency dividing circuit 17. In addition, each output from the time system counter 18, calendar system counter 19, alarm memory 20, and water depth calculation output from the water pressure detection device 25 are input to the decoder/driver circuit 28 through selection control by the display control circuit z7. It is configured to drive the liquid crystal display device 1 described above.

On the other hand, the mode selection switch S mentioned above. is a 1-bit three-stage configuration υ) ring counter (
According to the state of the mode selection circuit 60, the display of the above-mentioned sword opening function display section 1b can be selectively switched by the display control iK1 circuit 27. It is structured like this. That is, in the liquid crystal display layer #1 of the watch of this embodiment, the time display section 1a always displays the current time 211 according to the contents of the time system counter 18, or the additional mechanism display section 1b displays the mode selection circuit. In the normal mode when 60 is in the state of m, the calendar is set according to the 2000 counter 19 (T+g in In the diving mode shown in FIG. It is a correction switch constituted by S2, and according to the rW of the remote selection circuit 60 and the input from the 1$ positive switch block 61, the time system counter 18, the calendar system counter 19, and the alarm memory 20 Switch input control [11 circuit] for supplying the L correction signal.

Next, Figure 4 shows the specific definition of water pressure detection 3i25 □
It is a circuit diagram showing an example, and FIG. 5 is a time chart diagram of the valley clock signal 11 supplied from the clock signal forming circuit Z4 to the water pressure detection device 25. The aforementioned capacitor 9
is provided as a pressure detection element that has pressure/capacitance conversion characteristics that vary depending on the applied pressure. In order to convert the water pressure into a digital value, a water pressure detection device 25 is provided;
It is configured to include a programmable divider 66, a counter 67, a sub circuit 38, and the like.

In addition to the capacitor 9, the C-M OS' J song swing 664 includes a feedback resistor 41, a current-limiting resistor 42, and a C-MOS
-NAND Kairo 46 and C-LVI OS Inno-ku-
The oscillation frequency f of the oscillation 664 is determined by the resistance of the magnetism resistor 41 being R, and the capacitance of the capacitor 9f'. Let C1 be given by -f=1/2.2C,R.

Here, the activation of the water pressure detection device z5 in "Embodiment 1" will be explained.

First is the mode selection switch S. When the mode selection circuit 60 is set to the LLH state and the diving mode is selected by the operation, the AND circuit 63 is turned on by the diving mode selection signal d at the H level and becomes the target. Therefore, in this state, when the clock pulse ll for sampling is input from the clock signal forming circuit 24, the NAND circuit 43 is in the ON state for a period corresponding to the pulse width, and the C-■10 S IJ ring is turned on. The oscillator 64 performs an oscillation operation, and on the other hand, the programmable divider 66 and counter 67 are activated by the clock pulse 14 given at a timing near the rising edge of the pulse φ1.
be reset. Also, since the clock pulse 12 is input to the AND circuit 65, the period v? according to the pulse width thereof is input.
During this period, the AND circuit 65 is turned on, and during this period, the oscillation output of the ring oscillator 64 is output to the AND circuit 65.
is input to the programmable divider 66 via
Furthermore, the divided output from the divider 66 is outputted to the counter 6.
If it is cut off at 7, it will be 2. Note that the frequency division ratio of the programmable divider 66 is configured to be determined by the frequency division ratio control signal e from the zero point adjustment ri'l nfl block 40, but this is This is to divide and distribute the water depth display area to zero, and its specific configuration is not directly related to the present invention, so its explanation will be omitted. Furthermore, the pulses I'+, 9' The count contents of the counter 37 indicate that a clock pulse immediately used for latch timing control, which is given at a timing near the falling edge of t, is input to the latch control signal input terminal 38a of the latch circuit 68. Be latched by the notch circuit 68. This latched content is capacitor 9
It is clear that the 6 quantity 1 direct C1, that is, the digital direct current that changes depending on the pressure applied to the capacitor 9, b
The water depth calculation block 69 calculates the water depth based on the latched digital signal, and inputs it to the display 1 output circuit 27 as a water depth calculation output b.

As a result, the additional machine i coarse display section 1b of the liquid crystal display device 1
The water depth is displayed on the display (b), and this water depth display value is held until the missing latch timing system ++ clock pulse for fp is given. Also, when the water depth is greater than a predetermined value in the water depth calculation block 69, When it is detected that this has occurred, a -H level warning signal a is output and input to the light emitting diode block 26 and the buzzer drive circuit 22, and the light emitting diode 6 and buzzer 6 activate the danger/warning operation. However, the warning signal a for this g alarm operation must also be held until the missing clock pulse is given.The period of the sampling operation in which the water pressure detection device 25 detects the water pressure, In other words, the period T of the clock pulse for causing the C'-MO8IJing oscillator 64 to perform the sampling operation may be determined according to the 4vtc, but if the period is too long, the clock current may increase/JO. If it is too long, it will take too long cF to obtain the necessary data, so in the case of a dial meter, it is 0.5
~10 seconds is appropriate.

Next, FIGS. 6 and 7 are cross-sectional views showing embodiments of the reservoir of the housing part of the hydraulic ejection element, respectively. However, in FIGS. 6 and 7, the same numbers as in FIG. 2 are the same elements. This shows that.

In FIG. 5, a capacitor 69 serving as a water pressure detection element has a first electrode 61a corresponding to the center of a diaphragm 61 made of a thin conductive metal plate, and an insulating plate 8.
It is composed of a second electrode 62 formed on the upper surface of the electrode 61a, and a dielectric material 66 of liquid or gas between the first and second electrodes 61a and 62. That is, when water pressure is applied to the diaphragm 61, the diaphragm 61 is displaced accordingly, so that the fixed (non-displaceable) second electric heater 62 provided on the insulating plate 8a and the central part of the diaphragm 61 are connected to each other. The gap between the turtle 1 and the electrode 61a and the density of the dielectric 63 change, and as a result, the capacitance value of the capacitor 69 changes. The holding part is airtightly attached to the stepped part of the f-o 8 by welding or the like, and a sealed space 65 is formed by the diaphragm 61 and the holding member 8.
The above-mentioned dielectric material 66 is sealed inside.

On the other hand, in FIG. 7, a capacitor 79 serving as a water pressure detection element is composed of a first electrode 71 and a second electrode 72 formed by a so-called lead frame method, and an elastic dielectric material 76 between the two electrodes. and the holding member 8
An insulating liquid or gas is sealed in a sealed space 75 formed by a diaphragm 74 and a holding member 8, which are airtightly fixed by zero-stage welding, adhesive, etc., as shown in FIG. In the embodiment shown in FIG. 6, water pressure is applied directly to the condenser, which is a water pressure detection element, whereas in this practical example, water pressure is applied indirectly to the condenser 79. It is configured. Therefore, in this embodiment, when the diaphragm 74 is displaced by water pressure, the pressure of the liquid or gas in the sealed space 75 also changes, and the elastic dielectric 76 is also compressed in accordance with this change in pressure. , the first and second electric currents f
li! , 71, 72 must also be shortened, which also causes a change in the capacitance of the capacitor 79. Regarding the embodiments shown in FIGS. 6 and 7, as in the case of the first embodiment, the capacitor serving as the detection element is a C-type oscillation charge/discharge capacitor.
It is clear that the output of the MO8IJ oscillator can be converted into a digital value such as a pressure value.

As described above, according to the present invention, pressure is converted into a digital value by using a C-MO3IJ oscillator in which a pressure detection element having pressure/capacitance conversion characteristics is used as a charge/discharge capacity in CR type oscillation. Because it is configured to
Conventional hammering is complicated and consumes a large amount of current using bridge circuits and A.
By using a /D converter circuit, etc., it is possible to realize a compact pressure detection device with low current consumption. It also becomes possible to provide a small portable device for one use.

In addition, if the change in the oscillation frequency of the C-MO8IJ oscillator with respect to the change in pressure is not linear, and if you want to finally obtain the pressure as a digital value, for example, in the 4th section, first in the water depth calculation block 69, etc. It is possible to use means such as obtaining a value roughly corrected to a linear relationship and then calculating the water depth value.

Further, the present invention is applicable to general pressure detection devices such as water pressure detection devices, atmospheric pressure, contact pressure, etc. Also C-M
O3! It is clear that when it is desired to adjust the charging/discharging capacity value of the J-ring oscillator, the g amount of -A rain adjustment may be connected in series or in parallel to the detection element as required.

Furthermore, as an embodiment of the present invention, C-MO8! The feedback resistor, which is a component of the J-gun ball generator, is also used as a pressure ejection element that has custom-made pressure/resistance odor changes such as so-called semiconductor pressure sensors and pressure-sensitive conductive rubber. It is also possible to configure so that both resistances σ) change, and in that case, it is also possible to increase the detection sensitivity and the number of detection ends, for example, due to the synergistic effect of both detection characteristics.

The present invention is a water pressure detection device that can be installed in a small Kameko device, a pressure detection device that can be installed in a portable OT measurement device, etc. This has the great effect of realizing a low energy consumption type pressure detection device.

[Brief explanation of drawings]

1 to 5 are diagrams showing an electronic wrist watch for dialers according to an embodiment of the present invention. FIG. 1 is a plan view showing the external appearance of the watch, and FIG. 3 is a block diagram schematically showing the configuration of one circuit of the watch, FIG. 4 is a circuit diagram showing the water pressure detection device, and FIG. 5 is a main clock signal for the water pressure detection device. The chart diagram, FIG. 6, and FIG. 7 are cross-sectional views showing other embodiments of the accommodating portion of the water pressure detection element. , 1-...Liquid crystal display device 1a...Time display section 1b...Additional function display section 2...Case 4...Accommodation of water pressure detection element Part 9.6q-7q...Capacitor 16--...-
・Crystal oscillation circuit 17... Frequency divider circuit 18...
Time system counter 24...Clock signal forming circuit 25-...
・Water pressure detection device 27...Display side tilt circuit 60...
...Mode selection circuit 34...C-IVIO'slJing oscillator 36
...Programmable divider 67...Counter 68...Latch circuit 39...Water depth calculation block 40...Zero point A adjustment control wholesale block, 6\1a, 71
．． 91...First electrode 62.72.92...
Second electrode 73.96...Elastic dielectric patent applicant Ntizen Watch Co., Ltd. Fig. 1 1q Fig. 2 Fig. 3 Fig. 5 Fig. 61 Fig. 7

Claims (3)

[Claims] (1) Pressure detection comprising a detection element for directly or indirectly detecting pressure, and a conversion circuit for converting the detection result by the detection element into digital value data and outputting it. In the device, the detection element is composed of a capacitor having a pressure/capacitance conversion characteristic in which the capacitance value changes depending on the applied pressure, and the conversion circuit '7 is configured to charge and discharge the detection element in a CR type full oscillation. Capacity C-
A pressure sensing device comprising at least an MO8'Jing oscillator. (2) The pressure detection device according to claim 1, wherein the detection element is a capacitor having an elastic dielectric between electrodes. (3) Claims characterized in that the detection element comprises a capacitor including a first electrode that is displaced when receiving pressure and a fixed second electrode that faces the first electrode. The pressure detection device according to item 1.