JPS60253828A - Electronic clinical thermometer - Google Patents

Abstract

PURPOSE:To make the titled clinical thermometer easily adaptable to centralized control, by taking in the content of a counter in parallel and providing a shift register performing shift operation in synchronous relation to a predetermined shift clock signal, the output terminal thereof and the output terminal of the shift clock signal. CONSTITUTION:The output of a temp. sensitive element RT receives frequency conversion in a R-f converting part 1 and an inputted pulse signal is counted for a predetermined time in a data processing part 2 and converted to a digital value by adding correction based on the temp. characteristic of the element RT to said signal while the digital value is outputted to a display part 3 and a shift register 4. The register 4 takes in a data signal in parallel when receives a preset clock signal from a control part 5 and outputs the same to the outside serially every when a shift clock signal comes. Further, by taking AND logic of both of them from data output and the shift clock signal synchronous thereto, data is reproduced in a receiving side.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an electronic thermometer with a digital display and a data output function.

(Prior Art) The following methods have been conventionally employed in electronic thermometers. In other words, the resistance value of a temperature-sensitive element such as a thermistor whose resistance value changes depending on temperature changes is converted from resistance value to frequency (hereinafter referred to as R-f conversion), and the frequency is counted at an appropriate time. , the count value is corrected and displayed in a one-to-one correspondence with the measured temperature value. Note that as a method of R-f conversion, for example, an oscillation circuit that combines a CMOS inverter circuit, a capacitor, and a temperature sensing element is used. However, since electronic thermometers with such a configuration are an extension of conventional non-electronic stick thermometers, they are intended for personal use. However, although there are great advantages in replacing an analog display with an easy-to-read digital display, in places such as hospitals where the body temperature of many people is centrally managed, it can be said that there is not much difference in convenience compared to a conventional stick thermometer.

(Objective of the Invention) The present invention solves the problems of the prior art and provides a circuit system for an electronic thermometer suitable for centralized management applications.

(Structure of the Invention) For the above purpose, the present invention is provided with a circuit and a terminal for outputting digitized body temperature values during and at the end of temperature measurement to the outside.

(Example) An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the electronic thermometer of this invention. As shown in the figure, RT is a temperature sensing element such as a thermistor, and is connected to the R-f converter I, and 11 is an output terminal of the R-f converter I. 2 is a data processing section, its p pulse input terminal 21 is connected to the output terminal 11 of the R-f conversion section l, 22 is a control input terminal, and 23
．． 24 is a data output terminal. 3 is a display section, the data input terminal 31 of which is connected to the data output terminal 23 mentioned above. 4 is a shift register whose data input terminal 41 is connected to the data output terminal 24, 42 is a preset clock input terminal, 43 is a shift clock input terminal, and 44 is a data output terminal. 5 is a control section, the data processing control output terminal 51 is connected to the control input terminal 22 of the data processing section 2, the precent clock output terminal 52 is connected to the preset clock input terminal 42 of the shift register 4, and the shift clock output terminal 53 is connected to the shift register 4. M, SFI connected to the register 40 shift clock input terminal 43 and the clock output terminal 61 of the thermometer unit 6
-ru. The data output terminal 44 of the shift register 4 is connected to the data output terminal 62 of the thermometer unit 6.

The operation of such a configuration will be explained next.

The temperature sensing element RT is an element whose resistance value changes depending on the temperature T, and the R-f converter 1 converts the resistance value R(
A signal obtained by converting the frequency of the resistance value R(T), that is, a frequency f corresponding to R(T+
(R(T)). For example, a signal of about 30 kHz is output at a temperature of 37°C.

Next, the data processing unit 2 counts the pulse signal inputted to the input terminal 21 for a predetermined time (To), holds the count result, and adds the resistance value RfT) to the count result.
The operation is such that some kind of correction is made to correspond to the ambient temperature T of .

That is, the oscillation frequency for a predetermined time (To) is counted as a pulse, this count is corrected based on the temperature characteristics of the thermistor, and then converted into a digital value of temperature. Next, the corrected temperature data is output to data output terminals 23 and 24. Note that the predetermined time T. is created by the signal input to the input terminal 22.

The shift register 4 inputs the data signal input to the data input terminal 41 in parallel when a preset clock signal is applied to the preset clock input terminal 42 (for example, 3700 in BCD code), and inputs the data signal to the shift clock input terminal 43. Each time a shift clock signal is received, the input data signals are sequentially output from the data output terminal 44 (for example, in the case of 3700 in BCD code, 0011
011100000000).

Then, the data output terminal 44 is set to 1 bit, and the data length is set to 16.
When the focus is set, all data is output from the output terminal 44 when 16 shift chronograph signals are received.

On the other hand, the display section 3 is a section that displays numbers according to the data content of the data signal input to the data input terminal 31, and displays a numerical value that corresponds one-to-one with the ambient temperature T of the temperature sensing element RT. However, the control section 5 first determines the time T during which the data processing section 2 performs the above-mentioned counting operation.

A timing signal for generating T is created, outputted to data processing control input terminal 5□, and then T. At the end of the time period, the preset clock signal of the shift register 4 is output to the output terminal 53, and then the shift clock signal (16 pulse signals in this embodiment) is output to the output terminal 53.
Output from. The control section 5 repeats the above operation at a certain period. As a result, the display unit 3 displays a numerical value corresponding to the temperature T, following the temperature T which changes from moment to moment. Furthermore, the contents of the shift register 4 are serially outputted to the output terminal 44 of the shift register 4, that is, the data output terminal 62, for each pulse of the shift clock signal, and similarly, the data signal corresponding to the temperature T is serially outputted to the output terminal 44, that is, the data output terminal 62. It will be output. Further, a shift clock signal synchronized with the data output from the data output terminal 62 is output from the clock output terminal 6□ in synchronization with the data output from the data output terminal 62, as shown in FIG. Then, outside the thermometer unit 6, both the data output and the shift clock signal are transmitted through a communication line, and on the receiving side, the data, for example, It 3 III, can be easily transmitted by ANDing the data output and the shift clock signal.
7 II II OII (IO7+) can be reproduced. Therefore, in hospitals, for example, thermometers can be placed in each bed, and each can be applied to a centralized management system connected online.

(Effects of the Invention) As explained above in detail, the present invention has an extremely simple configuration in which a shift register, a shift clock signal generation circuit, and two output lines to the outside are added to a conventional electronic thermometer control circuit. Temperature data can be easily signaled to the outside. Moreover, the two external signals can be very easily restored to temperature data externally.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the electronic thermometer of the present invention, and FIG. 2 is a diagram showing the data output signal and shift clock signal thereof. RT... Temperature sensing element, 1... R-f conversion section, 2... Data processing section, 3. Display section, 4... Shift register, 5
...control section. Patent applicant Oki Electric Industry Co., Ltd.

Claims (1)

[Claims] A temperature sensing element, a resistance-frequency conversion means for frequency converting the resistance value of the temperature sensing element, a counter for counting output pulses from the resistance-frequency conversion means, and inputting the counter output at a predetermined timing. In an electronic thermometer having a latch means and a display means for numerically displaying the output of the latch means, the contents of the counter are inputted in parallel at a predetermined timing and shifted in synchronization with a predetermined shift clock signal. An electronic clinical thermometer comprising a register, an output terminal of the shift register, and an output terminal of the shift clock signal.