JPH0467620B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electronic thermometer, and particularly relates to an electronic thermometer that integrally combines a sensor section for sensing body temperature, an arithmetic circuit section for calculating body temperature, a body temperature display section, and a battery for power supply. This invention relates to an electronic thermometer that includes a module fitted into a housing.

[Technical background of the invention and its problems]

An electronic thermometer uses a temperature-sensitive element, such as a thermistor, whose resistance value changes depending on temperature in the sensor part, measures the change in resistance value, calculates the temperature, and digitally displays this as body temperature. There are various types of electronic thermometers, one of which is known as the oscillation method. This converts each resistance value of a temperature sensing element such as a thermistor and a reference resistor whose resistance value hardly changes depending on temperature into the frequency of an oscillation circuit, and calculates the temperature from each frequency using an arithmetic circuit. In such electronic thermometers, temperature calibration is essential during the manufacturing process.

Conventionally, electronic thermometers have a cylindrical part integrally formed in a housing that houses a body temperature calculation circuit, a display part, and a power supply battery, and a sensor part fixed to the tip of this cylindrical part is connected to the calculation circuit part. It has a connected structure.
When performing temperature calibration on an electronic thermometer configured in this way, after the arithmetic circuit section is housed in the casing, it is inserted through a small hole made in the casing corresponding to the position of the variable resistor for temperature calibration in the arithmetic circuit section. A method has been adopted in which calibration is performed, or the arithmetic circuit unit connected to the sensor unit via a relatively long conductive wire is taken out of the housing, and then the calibration is performed and then stored in the housing. Another method is to calibrate the temperature with only the temperature sensing element, such as a thermistor, connected to the arithmetic circuit section, then store them in a housing and assemble the sensor section. Since the sensor part is covered with a metal cover and filled with an adhesive or the like, the resistance value and capacitance of the sensor part change, making it difficult to perform accurate calibration.

As mentioned above, temperature calibration work for electronic thermometers is carried out with the sensor section, arithmetic circuit section, etc. housed or attached to the housing, so there is a risk of damaging or staining the housing, and the workability is also significantly inferior. .

Furthermore, when cleaning the electronic thermometer with a disinfectant after it has been used by a patient, it is desirable to prevent the disinfectant from penetrating into the interior through the fitting portion of the housing.
To make the inside of the casing liquid-tight, the fitting part of the casing is generally sealed with adhesive after the main body is assembled, but in the case of electronic thermometers, it is common practice to seal the fitting part of the casing with adhesive etc. For this reason, sealing with adhesive is somewhat inconvenient for subsequent use.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and is an integral combination of a sensor unit that senses body temperature, an arithmetic circuit unit that calculates body temperature based on the output signal from the sensor unit, a body temperature display unit, and a battery for power supply. To provide an electronic thermometer which can be easily made into a liquid-tight structure by fitting a module into a housing.

[Summary of the invention]

The present invention includes a sensor unit that detects body temperature, such as a thermistor whose resistance value changes depending on body temperature, an arithmetic circuit unit that measures the resistance value of the thermistor that changes depending on body temperature and calculates body temperature, and a digital digital camera that measures this body temperature. This electronic thermometer is constructed by integrally attaching a display section for converting and displaying information and a power source battery to a predetermined base to form a module, and fitting this module into an exterior casing. Furthermore, the electronic thermometer is such that the module is fitted into a housing via a sealing material such as an O-ring, and the interior of the housing is made into a liquid-tight structure.

[Example of the present invention]

Next, the present invention will be explained in detail with reference to illustrated embodiments. In FIG. 1, a sensor section 3 consisting of a thermistor is attached to the tip of a base 2 of a module 1, and an arithmetic circuit section 5, a body temperature display section 6, and a power source battery 7 are connected to the sensor section 3 via a conductive wire 4.
are respectively disposed on a base body 2 to form a module 1. The sensor section 3 has a metal cap 32 sealed at the tip of a probe 31 which is an elongated extension of one end of the base 2 of the module 1, and a thermistor sealed in the metal cap 32. The thermistor and the arithmetic circuit section 5 are connected through the inside of the arithmetic circuit section 31. 8 is a variable resistor for temperature calibration, and 9 is a power switch. Reference numeral 10 denotes a housing into which the module 1 is fitted, and is composed of a case 11 and a cover 12. Insert this module 1 into the case 11 of the housing 10 with the sensor section 3 first,
A cover 12 is placed over the battery 7 and fixed to the base body 2 with set screws 13 and fitted into the case 11. The sensor section 3 protrudes outward from one end of the case 11 and is directly used for body temperature measurement.

Since the module itself has the function of an electronic thermometer, it is possible to perform temperature calibration as it is without fitting it into the housing.
You can expect accurate proofreading.

Next, in the electronic thermometer configured as described above, an O-ring is attached to the fitting portion between the module 1 and the case 11, and an O-ring is attached to the fitting portion between the case 11 and the cover 12.
By interposing the rings 15 and attaching the O-rings 16 to the setscrews 13, the inside of the housing 10 can be made liquid-tight.

FIG. 2 shows an example of the liquid-tight structure of the battery section. O-rings 14 and 15 are attached to the module base 2 and inserted into the case 11, and the battery 7 exposed from the end of the case 11 is covered with the cover 12 and fitted into the case 11. Pass the set screw 13 with the O-ring 16 attached through the hole 17 in the head of the cover 12 and tighten the nut 18.
to fix the cover 12 to the base body 2. By tightening the set screw 13, the cover 12 is attached to the base 2.
Applying a pressing force in the axial direction of the cover 12, the tip 1 of the cover 12
9 and the tapered portion 20 of the case 11, the O-ring 15 is compressed and deformed to seal the fitting portion. The perforation 17 in the cover 12 is sealed by an O-ring 16 of the set screw 13. Since the sensor section 3 side of the base body 2 is sealed by the O-ring 14, the inside of the housing 10 is kept liquid-tight. Since the cover 12 can be freely attached and detached using the setscrew 13, the battery 7 can be easily replaced. Of course, a square ring may be used instead of the O-ring. Furthermore, if the battery does not need to be replaced, it is also possible to seal it with an adhesive.

〔Effect of the invention〕

As described above, the electronic thermometer of the present invention performs temperature calibration on the module that is integrally assembled with the sensor section, the arithmetic circuit section, the body temperature display section, and the power supply battery, so that accurate calibration can be performed.
Moreover, there is an advantage that the exterior casing is not damaged or soiled. In addition, by fitting the module into the casing via a sealing material such as an O-ring, the inside of the casing can be easily made liquid-tight, so the electronic thermometer can be cleaned by immersing it in a disinfectant solution after use. It is possible to do so.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the internal structure of the casing of the electronic thermometer of the present invention, and FIG. 2 is an enlarged cross-sectional view showing the liquid-tight structure of the battery section. 1 is a module, 3 is a sensor section, 5 is a calculation circuit section, 6 is a body temperature display section, 7 is a battery, 10 is a housing, 1
4, 15, 16 are O-rings.

Claims (1)

[Scope of Claims] 1. A sensor section that is disposed within a probe with a metal cap sealed at the tip and that senses body temperature, an arithmetic circuit section that calculates body temperature based on an output signal from the sensor section, and an arithmetic circuit. The sensor of the module is configured to be capable of temperature measuring operation by integrally combining a display section that digitally displays body temperature according to the output from the section, a variable resistor for temperature calibration of the arithmetic circuit section, and a power supply battery. An electronic thermometer in which a module is fitted into a housing with the module protruding outward from one end of the housing. 2. The electronic thermometer as set forth in claim 1, wherein the module is fitted into a casing via a sealing material, and the inside of the casing has a liquid-tight structure.