JPS60249021A - Electronic thermometer - Google Patents

Abstract

PURPOSE:To economize the wasteful consumption of electric power and to measure temp. with desired accuracy even if a thermometer is used for either a clinical thermometer or thermometer by varying the sampling period of the signal from a temp. sensor according to a selected mode. CONSTITUTION:The preset bodily temp. flag in a CPU8 is reset and the thermometer acts as a thermometer when a power source switch 4 is turned on. An FET5 is turned on and the signal from the temp. sensor 1 is converted to digital data and is read when the time for sampling is attained. The room temp. is calculated by the temp. table for the room inside in a memory 9 in accordance with the read-in data and is outputted to a display device 3. On the other hand, the bodily temp. is displayed on a display device 3a when a mode selector switch 2 is turned on in order to act the thermometer as a clinical thermometer. The timer is then set at 1sec and the signal of the sensor is converted to digital data and is read. The bodily temp. is calculated by the bodily temp. table in the memory 9 in accordance with the read-in data and is outputted for 5min to the display device 3. The thermometer functions as the bodily thermometer for 5min and is then automatically changed over to the thermometer function.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an electronic thermometer that can be used both as a thermometer and as a thermometer.

(Prior art and its problems) Conventionally, electronic thermometers have used a peak hold circuit, a sampling hold circuit, etc. to measure temperature. For example, an electronic thermometer using this sampling and hold circuit can be used as a thermometer while maintaining the function of a thermometer.

However, electronic thermometers that have the function of a thermometer need to accurately measure body temperature in a short period of time, so the sampling period is shortened, and in order to further improve measurement accuracy, an open current is applied to the temperature sensor at a predetermined time. The temperature is sampled from a stable state, but power is being consumed during this sampling.

However, thermometers are rarely required to measure temperature in a short period of time, but rather are required to measure temperature over a long period of time. Therefore, if the same sampling cycle is used when functioning as a thermometer and when functioning as a thermometer, temperature sampling will be performed at a shorter cycle than the sampling cycle originally required for a thermometer, which is unnecessary. This will consume electricity. In other words, this is a waste of power.

(Object of the Invention) The present invention was made in view of the above-mentioned problems, and its purpose is to provide an electronic thermometer that can be used both as a thermometer and a thermometer, which can reduce power consumption, and that can be used both as a thermometer and a thermometer. It is an object of the present invention to provide an electronic thermometer that can measure temperature with desired accuracy no matter how it is used.

(Structure and Effects of the Invention) In order to achieve the above object, the electronic thermometer of the present invention includes a temperature sensor, a device that measures temperature based on a signal from the temperature sensor, and a device that measures the temperature measured by the device. an electronic thermometer having a display device for displaying a signal, a switching processing means for processing the signal from the temperature sensor as body temperature data or temperature data other than body temperature; and a switching processing means for processing the signal from the temperature sensor as body temperature data or temperature data other than body temperature; and means for varying the sampling period of the signal from the temperature sensor. According to the present invention having such a configuration, when the electronic thermometer is used as a thermometer or thermometer, the sampling period can be varied, that is, when the electronic thermometer is used as a thermometer or thermometer, the sampling period can be longer than when it is used as a thermometer. This reduces the power consumption of electronic hygrometers, and the long sampling period when used as a thermometer does not reduce the measurement accuracy since the measurement target is something that does not undergo sudden temperature changes. In other words, this electronic thermometer that has both the functions of body temperature 4 and thermometer improves the efficiency of power consumption and can measure temperature with desired accuracy.

(Example of the invention) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows one embodiment of the present invention, and is an overall perspective view of an electronic thermometer. In the figure, 1 is a yAmaro sensor, and this temperature sensor 1 is, for example, a thermistor, and is connected to a measuring device inside the main body by a connecting cable.

2 is a mode changeover switch, and this mode changeover switch 2 performs switching for processing the signal from the temperature sensor 1 as body temperature or, for example, room temperature data. 3 is a first indicator, and this indicator 3 is connected to the temperature sensor 1.
Displays the temperature measured using the . 3 aJt is the second display, and this display 3a displays "body temperature" when the mode changeover switch 2 is turned on and the electronic thermometer is used as the thermometer. 4 is the power switch of the electronic thermometer. .

FIG. 2 is a block diagram of the electronic thermometer.

In the figure, the same parts as in FIG. 1 are designated by the same reference numerals, and redundant explanation will be omitted. In the figure, 5 is a field effect transistor (hereinafter referred to as FFT), and this FET 5 conducts between the source and drain based on the control signal a (signal from cpus, which will be described later) input to the gate. (
ON) or non-conducting (OFF>. 6 is the amplifier (
(hereinafter referred to as AMP), and this AMP6 is the FE
When T5 is turned ON, the minute signal from the temperature sensor 1 is amplified to a signal of a required level. Reference numeral 7 denotes an A/D converter, and this A/D converter 7 converts the signal set at the required level by the AMP 6 into digital signal data. 8 is a CPU that centrally controls the electronic thermometer, and this CPU outputs a control signal to the gate of FET 5, and inputs the data obtained by converting the signal obtained from this control signal into a digital signal by A/D conversion @ 7. . Further, a signal from a mode changeover switch 2 is already input to this CPU in order to use the electronic thermometer as a thermometer or thermometer.

Reference numeral 9 denotes a memory, and this memory 9 is connected to the CPtJ8 to calculate the temperature corresponding to the input data, so it can be used as a thermometer in the range of -5°C to 45°C, and as a thermometer, for example in the range of 35°C to 40°C. Stores range temperature tables, etc.

FIG. 3 shows the contents of processing by the CPU 8 of the electronic thermometer. Hereinafter, the operation of the electronic thermometer will be explained according to this flowchart.

As a control device, the CPU 8 is supplied with power from the power source B by turning on the power switch 4, and starts after a predetermined elapsed time. First, various initial values are set, that is, initialization is executed (S
T1). Next, the body temperature flag set in advance in CPLJB is reset, and if it is displayed on the display 3a, for example, ``body temperature'' is erased (ST2).
. In other words, electronic thermometers function as thermometers. Next, a determination is made as to whether it is time to sample the temperature using the temperature sensor 1 (ST3). As a result,
If sampling time II (ie, timer SPT that determines sampling time, so-called sampling period) is not reached, the process proceeds to step ST4, where it is determined whether mode changeover switch 2 is ON or OFF. Then, mode selector switch 2 is turned OFF.
If so, steps ST3→ST4 are repeated until the time preset in SPT in step STI. On the other hand, when it comes time to sample, steps ST5→ST6
→Proceed to ST7, turn on the FET 5, convert the signal from the temperature sensor 1 into digital signal data, and read the data. Then, this data is temporarily stored and FET5 is turned off. Subsequently, a determination is made as to whether or not the body temperature flag is set (ST8). Here, since the body temperature flag is in a reset state, step 5T9-→5
Proceeding to T10, based on the read data, the room temperature is calculated using, for example, an indoor temperature table in the memory 9, and
The data is converted into display data and output to the display 3. and,
Returning to step ST3 again, this routine is repeated.

On the other hand, in order to make the electronic thermometer function as a thermometer, when the mode changeover switch 2 is turned on, step ST11→5
Proceed to T12→STI 3→5T14.

In other words, this process first sets the body temperature flag and displays "body temperature" on the display 3a, since the body temperature flag has previously been reset (the electronic thermometer was functioning as a thermometer).
is displayed and the SPT is set to t seconds (for example, 1 second). If the sampling time is set in step 5T13, then step ST3→ST5→ST6→S
Proceeding to T7, the signal from the temperature sensor 1 is converted into digital signal data and read in the same manner as described above. Subsequently, since the body temperature flag is set, step ST8→5T1
5, the body temperature is calculated using the body temperature table in the memory 9 based on the read digital signal data. Then, the body temperature measurement is completed, and this body temperature measurement is 5
Measurement is performed until minutes have passed (ST16), and the measured body temperature is converted to display and output to the display 3 (ST1
0) The process is repeated. When the measurement is completed in this routine and 5 minutes have passed after turning on the -mode changeover switch, step ST16→ST17→5T18→5T1
9→5T10, the body temperature flag is reset, the display of “'body temperature” on the display 3a is erased, and the SPT is set to 1 minute (for example, 5 minutes). In other words, by turning on the mode changeover switch 2, the electronic thermometer functioning as a thermometer can perform the thermometer function for 5 minutes, and then automatically switch to the thermometer function.

In addition, when an electronic thermometer is used as a thermometer (the body temperature flag is set), if the mode changeover switch 2 is turned on before the measurement of body temperature is completed and 5 minutes have elapsed, step 5T1
Proceed to 1→5T20−+5T21→5T22. here,
The body temperature flag is reset to erase the display of "body temperature" on the display 3a, and the SPT is set to 1 minute.In other words, the electronic thermometer that functions as a thermometer is automatically or manually switched to a thermometer. In other words, after a predetermined period of time, this electronic thermometer automatically switches to the thermometer function, which requires extremely low power consumption due to its large sampling period. Since you can immediately switch to the temperature thermometer manually, you can efficiently consume power without reducing measurement accuracy.In addition, this flowchart also shows if there is an abnormal change between the previously measured body temperature and the currently measured body temperature. It is even better to add a routine that executes an alarm, such as flickering the body temperature displayed on a display or setting up a buzzer to sound, if it is discovered.

Furthermore, although the flow V-t shown in Fig. 3 constantly scans the measurement, it may be possible to measure the sample pulse or power-on signal used in opening measurement by switching operation using an interrupt signal. .

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, and is a schematic perspective view of an electronic thermometer, Fig. 2 is a block diagram of an electronic thermometer according to an embodiment of the invention, and Fig. 3 shows the electronic thermometer. 3 is an operation flowchart of the meter. 1...Temperature sensor, 2...Mode selection switch, 3
...First display, 3a...Second display, 4...
・Power switch, 5... Field effect transistor (FE
T), 6... Amplifier, 7... A/D converter, 8...
・cpu. 9...Memory. Patent applicant Tateishi Electric Co., Ltd. Agent Patent attorney Tetsuji Iwakura (1 other person)

Claims (4)

[Claims] (1) An electronic thermometer that includes a temperature sensor, a device that measures temperature using a signal from the temperature sensor, and a display that displays the temperature measured by the device, An electronic thermometer comprising a switching means for processing body temperature data or temperature data other than body temperature, and means for varying a sampling period of a signal from the temperature sensor according to a switching mode of the switching means. (2) The electronic thermometer according to claim 1, wherein the switching processing means includes a manual switch for inputting switching for processing the signal from the temperature sensor as body temperature data. (3) The switching processing means is provided with a switching means for automatically switching after a predetermined period of time to process the signal from the temperature sensor as temperature data other than the body temperature. Electronic temperature gauge described in section.・ (4) The electronic temperature according to claim (2), wherein the manual switch has a switching function for processing a state in which the signal from the temperature sensor is processed as body temperature data as temperature data other than body temperature. Total.