JPS6053874A - Electronic timepiece with pressure sensor - Google Patents

Abstract

PURPOSE:To make it possible to measure not only an absolute altitude and the absolute depth of water but also a relative altitude and the relative depth of water and to enable use as an atmospheric pressure meter, by using a readable memory circuit and a freely writable and readable memory circuit. CONSTITUTION:The standard atmospheric pressure at 0m above sea level of a readable memory circuit 7 is written in a freely readable memory citcuit 8. An absolute altitude is calculated by differential operation of the content of said circuit 8 and atmospheric pressure through a pressure sensor 1 and a count circuit 6 and displayed by a display part 15. On the ohter hand, when the content of the circuit 6 is written in the circuit 8 and set to a reference value, a relative altitude is similarily measured. The depth of water is also similarily measured and the measurement of atmospheric pressure is also similarily performed. By these mechanisms, an electronic timepiece with a pressure sensor functions not only as an absolute altitude and water-depth meter but also a relative altitude and water-depth meter of an atmospheric pressure meter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic watch that has a pressure sensor and functions as an atmospheric pressure gauge, an altimeter, or a water depth gauge, and the object of the present invention is to measure atmospheric pressure.

Altitude. It is possible not only to measure the absolute value of water depth, but also to measure relative values by using an external operation and using the measured value at the time of external operation as a reference. For example, in the case of an altimeter or a depth meter, by performing an external operation at the starting point, it is possible to measure how many meters higher or lower the user has reached from the starting point. In the case of a barometer, by operating it externally at a certain point, it is possible to determine at a glance whether the weather is improving or worsening from that point on.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows an embodiment of the present invention, in which 1 is a pressure sensor that converts pressure information into voltage, 2 is an amplifier circuit that amplifies the output voltage of the pressure sensor, and 3 is an oscillation frequency that is controlled by the power supply current. 4 is a MO transistor for controlling the power supply current of the excavation circuit 3; 5 is an AND gate for passing the output pulse of the excavation circuit 3 only in the section where the signal α coming from the control circuit is H; 6 is a counting circuit that counts the number of pulses that have passed through the AND gate 5; 7 is a readable first memory circuit; and 8 is a filler. The readable second storage circuits 9, 10 and 11 are clocked and controlled by signals C and d coming from the control section, respectively.
The inverter group 12 is set in advance from the count value of the argument circuit based on the contents of the second memory circuit 8, and performs calculations, and the altitude difference -1, fC, outputs information on the atmospheric pressure difference or water depth difference. an arithmetic circuit, 13 a decoder, 14 a drive circuit,
15 is a display section. Figure 2 shows pressure sensor 1 and Kagi et al.
Figure 3 shows the relationship between the output voltage V of the amplifier circuit 2 and the output voltage V of the amplifier circuit 2).
1 is a diagram showing the relationship between the voltage applied to the gate of the transistor 4 and the number of pulses output through the AND gate 5, that is, the count value H of the counting circuit 6. be. To explain in more detail below using the altimeter function as an example, the first memory circuit 7 stores the standard atmospheric pressure P at altitudes o and m.

A value N corresponding to is set in advance. When measuring the absolute value of altitude, clock with signal 0. The inverter 10 is temporarily operated so that the second memory circuit 8 is connected to the first memory circuit 7.
Memory contents N. Transfer everything. At a certain altitude (atmospheric pressure P1
), the count value N8 of the counting circuit 6 and
When the signal d is clocked, the inverter group 11 is temporarily operated and the stored content No. of the second storage circuit 8 is inputted to the arithmetic circuit 12. The arithmetic circuit 12 uses N as a reference.
1, and this difference is multiplied by a predetermined coefficient of -n to convert it into altitude. Therefore, the absolute value of altitude is displayed on the display. Next, when an external operation is performed (for example, turning on a switch) to measure the relative altitude at the altitude of atmospheric pressure PK, the control circuit is clocked by the signal, inverter 9f, and temporarily K m,+ are activated. A count value N corresponding to l is written into the second storage circuit 8. Next, when measuring at a certain altitude (atmospheric pressure Pm), the count value N of the counting circuit 6 and the signal d are shifted. The inverter group 11 is all temporarily operated to store the memory content N1 of the second memory circuit.
is input to the arithmetic circuit 12. The arithmetic circuit 12 calculates the difference between N1 and N1, and multiplies this difference by the coefficient to convert it into an altitude. Then, the display shows atmospheric pressure P.
The altitude (relative altitude) at a point with atmospheric pressure P8 with respect to the ground of 1 is displayed.Furthermore, when an external operation is performed to measure the absolute altitude at a point with atmospheric pressure P, the control circuit outputs a signal of 0. The clocked inverter group 10 is operated at a certain point, and the second memory circuit 8 is convolved with N@'. From then on, the arithmetic circuit uses No as a reference and converts the altitude from N to obtain the absolute altitude. Furthermore, as shown in FIG. 4, the control section 18 inputs an external operation input and a division signal of the frequency dividing circuit to create each signal αebecmdk.FIG.
In the schematic timing chart of tbe'td, in FIG. 5, E indicates a signal when the clocked inverter is operated, and F indicates a signal when the clocked inverter is not operated.

(Accurately, the value Wt1 and l'L in the second storage circuit is clocked such as No - No e No, and is inverted by the inverter 9'i! or 10, but it is Clocked when input to the circuit, inverter 1
1, the value is inverted again to return to a value such as nN6-No-Nt, so for the sake of simplicity, a description of inverting is omitted. ) Below, we have explained in detail the case of the altimeter function ++ Q -, but in the case of the barometer function as well as the depth meter function, if the calculation of the calculation circuit is made appropriate for each function, then the altimeter function can be According to the present invention, the content of the first storage circuit or the count value of the counting circuit is selectively written into the second storage circuit by an external operation.
Based on the contents of the second memory circuit, the atmospheric pressure or 7C can be converted to altitude or water depth to give an absolute value. This has the great effect of allowing relative values to be measured selectively.

[Brief explanation of drawings]

Fig. 1 is a circuit explanatory diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between pressure P and amplifier circuit output voltage V, and Fig. 3 is a diagram showing the relationship between amplifier circuit output voltage ■ and count value N of the counting circuit. Figure 4 is a block diagram showing a part of the clock circuit; Figure 5 is a block diagram showing a part of the clock circuit;
The figure is a timing chart schematically showing the signal αtbsC2d. 1□Taka sensor 20. Amplification circuit 6-3. Oscillation circuit 4...MOS) transistor 5°, AND gate 6. Counting circuit 7.8 First storage circuit 8,. Second memory circuit 9 , 10 , 11 , clocked inverter group 1
2. Arithmetic circuit 16°0 Clock oscillation circuit 13°. Decoder 17. . Frequency dividing circuit 14°, drive circuit 18°, control unit 15. Display section ]90. Applicant for switch group and above Daini Seikosha Co., Ltd. Attorney Mogami Mogami 71

Claims (1)

[Claims] A pressure sensor that converts pressure into a current and detects it; an oscillation circuit whose oscillation frequency is controlled by the voltage t or current; a counting circuit that counts the output of the oscillation circuit; 1 memory circuit and a second memory circuit capable of writing and reading, and the content f7'c of the first memory circuit is determined by selectively changing the count value of the counting circuit by an external operation. An electronic watch with a pressure sensor that writes data into a second memory circuit and converts and displays atmospheric pressure, altitude, or water depth based on the contents of the second memory circuit.