JPH0735878A - Electronic clock - Google Patents

Abstract

PURPOSE:To enable correct altitude correction by changing an atmospheric pressure value, converted by a converting means, to an atmospheric pressure value at 0 meter of sea level by an operating means. CONSTITUTION:A pressure sensor 20 converts an atmospheric pressure value into an electric signal which is inputted to an amplifying circuit 19. An amplified signal 10a is fed to an A/D conversion circuit 18 which produces a digital signal 10b. The signal 10b is fed to an operating circuit 11 where it is operated as an atmospheric pressure value and stored in a RAM 12. An atmospheric pressure value corrected at sea level can be displayed by operating an external operating switch. When the atmospheric pressure value at an altitude of 40m is 1008hPa, for example, following calculation is conducted and an atmospheric pressure value of 1013hPa is displayed. PSL=1013, 25-Po(Alt)+P, where PSL is the atmospheric pressure value corrected at the sea level, Po(Alt) is an atmospheric pressure value determined from ICAO standard atmospheric, and P is a measured atmospheric pressure. Thus corrected atmospheric pressure value can be used effectively as one data for deciding the weather.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic timepiece equipped with a barometer which has an atmospheric pressure detecting function for detecting atmospheric pressure using a pressure sensor and a time measuring function.

[0002]

2. Description of the Related Art Conventionally, many timepieces in which other functions are added to timepieces for measuring time have been proposed and commercialized. Among them, a sensor in which a diaphragm and a resistor are formed on a silicon chip, that is, a so-called diffusion type semiconductor sensor has been put into practical use, and a watch having an atmospheric pressure measuring function is realized by using the sensor. When applied to a watch, it can be carried and moved, and compared to products that are fixed and used like a wall-mounted barometer, the user can know the barometric pressure in daily life, and the pressure difference Was used as one of the data when predicting the weather by graphically displaying as the atmospheric pressure change.

[0003]

However, it is a well-known fact that the atmospheric pressure changes when the altitude changes, based on the concept of the standard atmosphere. In the conventional measuring instrument having the atmospheric pressure detecting function, the measuring instrument is installed or Since the barometric pressure value at the held location and altitude is measured and displayed, it shows a numerical value different from the barometric pressure value generally known in weather forecasts and the like. In other words, the atmospheric pressure used in weather forecasts, etc. is corrected to the value measured at the altitude of 0 meters above sea level. It is impossible to judge whether the atmospheric pressure value is higher or lower than usual by only the atmospheric pressure value of the place where the atmospheric pressure measuring device is installed or held. Therefore, it is an object of the present invention to provide a barometric pressure measuring device capable of correcting and correcting the barometric pressure value at a point where the altitude is correctly corrected to the barometric pressure value at 0 meters above sea level.

In the case of a multi-function timepiece in which a wristwatch that is frequently carried and moved by a user has an added value of an atmospheric pressure detection function such as a pressure sensor, whether the change in atmospheric pressure value is due to an altitude change due to movement, It cannot be judged whether it is due to the change in atmospheric pressure. Even in such a case, it is an object of the present invention to provide a wristwatch with a barometric pressure measuring function, which can correct a barometric pressure value at a point whose altitude has been correctly corrected to a barometric pressure value at 0 meters above sea level and display a corrected measured value.

[0005]

In order to solve the above problems, according to the invention of claim 1, a pressure sensor, an A / D conversion circuit for converting a detection signal measured by the pressure sensor into a digital value, In an electronic timepiece provided with a conversion means for converting an output signal of the A / D conversion circuit into an atmospheric pressure value and a display means for displaying a conversion result by the conversion means, the atmospheric pressure value converted by the conversion means is at an altitude of 0 meters above sea level. It is characterized in that a calculation means for correcting the atmospheric pressure value is provided.

[0006]

The details of the present invention will be described below with reference to Examples.

FIG. 1 is a block diagram of an electronic timepiece according to the present invention, and 17 is an oscillator circuit for generating a frequency which is a reference of a time signal of the timepiece. Reference numeral 16 is a frequency dividing circuit, 15 is a time counter, and 14 is a control circuit for switching the graphic display. Reference numeral 13a is a liquid crystal driver for displaying the liquid crystal display element 13b. By the liquid crystal driver 13a, the time 26 of FIG. 2 and the atmospheric fluctuation graphic 24 are displayed on the liquid crystal. 20 is a pressure sensor. The pressure sensor 20 is an element that detects a pressure change of a gas or a fluid, deforms silicon, and thereby changes a bridge resistance, which causes an imbalance and a voltage change. The pressure sensor 20 converts the amount of atmospheric pressure into an electric signal and inputs the electric signal to the amplifier circuit 19. The amplified signal from the amplifier circuit is an analog-digital conversion circuit (hereinafter referred to as A / D conversion circuit).
It is input to 18 and converted from the analog signal 10a to the digital signal 10b. The digital signal 10b is input to the arithmetic circuit 11, calculated as an atmospheric pressure value, and stored in the RAM 12.

FIG. 2 is an external view of a timepiece to which the atmospheric pressure measuring function of the present invention is added. Reference numeral 21 is a watch case 22 is a display unit, which is a liquid crystal display element. Reference numeral 23 is a switch for displaying the sea level recalibration pressure. Reference numeral 24 represents a graphic representation of the change in atmospheric pressure up to the present, with the horizontal axis representing elapsed time and the vertical axis representing atmospheric pressure change. 27 is a graphic display showing the pressure tendency.
In this embodiment, the tendency of atmospheric pressure change is classified into stages, and it is shown that there is almost no change in atmospheric pressure when displayed in the center, and above the center is the degree of increase in atmospheric pressure and below is the degree of downward tendency. The change in atmospheric pressure after a short time is predicted by looking at the above-mentioned atmospheric pressure variation graphic 24. 26
Displays the current time. Reference numeral 25 is a current atmospheric pressure value, and 28 is an altitude value converted from the atmospheric pressure value 25.

As described above, the atmospheric pressure value indicates the atmospheric pressure value at the altitude used by the wearer,
In the example, the atmospheric pressure value 1008 hectopascal (hPa) at an altitude of 40 meters is shown. However, this atmospheric pressure value is completely different from the atmospheric pressure value reported in weather forecasts and the atmospheric pressure changes every time the altitude is changed, so the weather cannot be judged.

FIG. 3 is an external view of a timepiece displaying the sea level correction value of the present invention. By operating the external operation switch 23, the sea level calibration value 33 converted into the atmospheric pressure value at the sea level is displayed. In this embodiment, when the atmospheric pressure at a place at an altitude of 40 meters is 1008 hPa, it is displayed as 1013 hPa by the following calculation formula.

PSL = 1013.25-P0 (Alt) + P PSL: Atmospheric pressure value after sea level correction P0 (Alt): Atmospheric pressure value obtained from ICAO standard atmosphere P: Measured atmospheric pressure value By knowing not only the atmospheric pressure value at the place where the user is but also the atmospheric pressure at 0 meters above sea level, it is very effective as one of the judgment data for predicting the weather together with the above-mentioned atmospheric pressure graphic and atmospheric pressure tendency graphic. Although the present invention has been described by displaying the atmospheric pressure progress graphic portion by switching it to the atmospheric pressure sea level correction function, it goes without saying that the same effect can be obtained even if it is displayed on another display portion or the like.

[0012]

As described above, in the multi-function timepiece having means for detecting the atmospheric pressure and predicting the weather, even if the altitude changes due to movement or the like, the atmospheric pressure at 0 meters above sea level, which is the reference, can be easily operated. Since the values can be calculated and displayed, it is possible to know the change of the atmosphere that affects the weather accurately, and it has a great practical effect as one of the data for predicting the weather.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an internal circuit of an embodiment.

FIG. 2 is a diagram showing an appearance of an embodiment of the present invention.

FIG. 3 is a diagram showing an atmospheric pressure calibration value.

[Explanation of symbols]

 11 arithmetic circuit 12 RAM 13a liquid crystal driver 13b liquid crystal display element 14 control circuit 15 time counter 16 frequency divider circuit 17 oscillation circuit 18 A / D conversion circuit 19 amplification circuit 20 pressure sensor 21 watch case 22 display section 23 switch 26 time display section 33 Sea level pressure reading

Claims (1)

[Claims] 1. A pressure sensor, an A / D conversion circuit for converting a detection signal measured by the pressure sensor into a digital value, the A
Conversion means for converting the output signal of the / D conversion circuit into a barometric pressure value,
An electronic timepiece having a display means for displaying a conversion result by the conversion means, comprising an arithmetic means for correcting the atmospheric pressure value converted by the conversion means to the atmospheric pressure value at an altitude of 0 meters above sea level.