JP2000227361A - Infrared clinical thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly measure a body temperature by eliminating influences of unnecessary infrared rays radiated from a probe or the like in an infrared clinical thermometer. SOLUTION: The thermometer includes a reflecting face 12 for reflecting infrared rays radiated from a living body which is a part of a rotary ellipsoid obtained by rotating an ellipse about an axis connecting a first focal point and a second focal point of the ellipse, an infrared ray-detecting means 13 for detecting infrared rays reflected by the reflecting face 12 and condensed to the first focal point or second focal point and converting the infrared rays to electric signals, and a body temperature-calculating means 14 for calculating a temperature of the living body with use of the electric signals output by the infrared ray-detecting means 13. Unnecessary infrared rays are prevented from entering the infrared ray-detecting means 13 and, objects present at a position intersecting a half line and radiating unnecessary infrared rays are limited, thereby reducing influences of the unnecessary infrared rays. The body temperature can be correctly measured accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermometer for measuring body temperature of a living body, and more particularly to an infrared thermometer for measuring body temperature using infrared rays emitted from a living body.

[0002]

2. Description of the Related Art Conventionally, a thermometer for measuring the temperature of the sublingual or axillary contact, such as a so-called mercury thermometer, has been widely used for many years.

On the other hand, in recent years, an infrared thermometer for measuring a body temperature in a non-contact manner using infrared rays radiated from a living body has been proposed. Infrared thermometers use the fact that the surface of a living body can be regarded as almost a perfect black body with respect to heat radiation, and calculate the body temperature by measuring the intensity of infrared radiation radiated according to the law of black body radiation. There is no need to wait for the temperature to become the same as that of the living body, so that it has the characteristic that body temperature can be measured in just a few seconds.

As such an infrared thermometer, for example,
The one described in JP-A-6-165 was generally used. As shown in FIG. 8, this type of infrared thermometer detects a probe 1, a light guide tube 2 running in the probe 1 in a longitudinal direction, and infrared light propagated in the light guide tube 2, and detects the radiation intensity. Infrared detecting means 3 for converting the electric signal into an electric signal;
Body temperature calculating means 4 for calculating a body temperature from the converted electric signal
And operates as follows. When the probe 1 is inserted into the ear canal, the probe 1 comes into contact with the ear canal, makes the length direction of the probe substantially coincide with the direction of the ear canal, and causes the infrared ray emitted from the vicinity of the eardrum to enter the light guide tube 2.
The temperature measurement site of the living body is set near the eardrum. The light guide tube 2 has a high reflectance by forming the inner surface of a metal or plating the inner surface with a metal. The infrared light emitted from the vicinity of the eardrum is reflected directly or by the inner surface of the light guide tube 2. The light is incident on the infrared detecting means 3. The infrared detecting means 3 converts the incident infrared light into an electric signal having a correlation with the intensity of the infrared light, and the body temperature calculating means 4 calculates the temperature near the eardrum from the electric signal.

[0005] Strictly speaking, the magnitude of the output signal of the infrared detecting means 3 is affected by the temperature of the infrared detecting means 3 itself. Therefore, when the body temperature calculating means 4 calculates the temperature, the infrared ray measured by a thermistor or the like is used. Although the temperature of the detecting means 3 is used as a correction term, the details of such a temperature calculation method are not related to the subject of the present invention, and therefore detailed description is omitted.

[0006]

However, in such a conventional infrared thermometer, not only the infrared radiation radiated from the vicinity of the eardrum of the living body, which is the temperature measurement site, but also the unnecessary radiation radiated from the probe 1 is provided to the infrared detection means 3. Since infrared rays also enter, there is a problem that it is difficult to accurately measure the body temperature of a living body.

That is, a part of the infrared light radiated from the vicinity of the tip of the probe 1 is reflected multiple times on the inner surface of the light guide tube 2 and enters the infrared detecting means 3. As long as the temperature of the probe 1 is constant, such unnecessary infrared rays become constant, and it is relatively easy to cancel the influence.
However, in reality, the probe 1 comes into contact with the ear canal during the measurement of the body temperature and is affected by the heat conduction from the ear canal, so that the intensity of the infrared ray radiated from the probe 1 also changes.
It is difficult to cancel the influence of unnecessary infrared rays that fluctuate with time and to cause the body temperature calculation unit 4 to calculate the body temperature accurately.

Of course, it is possible to measure the body temperature after waiting for the temperature of the probe 1 to stabilize, but in such a case, it is necessary to abandon the excellent feature of the infrared thermometer that the body temperature can be measured in only a few seconds. Become.

In order to reduce the influence of unnecessary infrared rays, a thermal insulator and an air gap are provided at the tip of the probe 1 to reduce heat conduction from a living body, or the temperature of the tip of the probe 1 is measured by a thermistor or the like. Thus, a technique used as a correction signal when the body temperature is calculated by the body temperature calculating means 4 has been proposed in Japanese Patent Publication No. Hei 8-16629. However, even if this technique is used, the temperature distribution of the ear canal is affected by the environmental temperature and the body temperature. However, it is not easy to accurately correct the influence of unnecessary infrared rays that fluctuate accordingly based on the temperature measured at one point.

The problem that it is difficult to accurately measure body temperature due to the influence of unnecessary infrared rays radiated from a probe or the like is a common problem in realizing various techniques for improving the convenience of an infrared thermometer. It is.

For example, Japanese Patent Application Laid-Open No. Hei 6-142061 proposes a technique for notifying the measurement result of body temperature by voice. When such a technique is used, the probe is taken out of the ear canal after the body temperature measurement. Since it is unnatural for the user to report the measurement result, it can be assumed that the report is performed while the probe is inserted into the ear canal. Therefore, the temperature of the probe continues to rise even during the sound notification. For this reason, when one infrared thermometer is used continuously, such as when measuring the body temperature of a plurality of persons, the use of audio notification technology greatly increases the effect of unnecessary infrared rays emitted from a probe or the like, and reduces the body temperature. There is a problem that it is difficult to measure accurately.

Japanese Patent Application Laid-Open No. 6-285028 proposes a technique in which a body temperature is measured a plurality of times and the highest value of the plurality of measured values is reported as a true body temperature. However, when such a technique is employed, the time during which the probe is inserted into the ear canal is inevitably longer than when measuring only once to determine the body temperature. For this reason, there is a problem that the temperature change of the probe due to heat conduction from the ear canal becomes large, and it becomes more difficult to accurately measure the body temperature.

Japanese Patent Publication No. Hei 8-16629 discloses that
It is also mentioned that different diameter probes are used for adults and children, but if the probe diameters are different,
Since the temperature change of the probe itself when the probe is inserted into the ear canal becomes different, it becomes more difficult to reduce the influence of unnecessary infrared rays.

The problem that it is difficult to accurately measure the body temperature due to the influence of unnecessary infrared rays is not unique to an ear-type infrared thermometer that measures the temperature near the eardrum,
A similar problem occurs in an infrared thermometer that measures the temperature in the oral cavity, the axilla, and the like.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention uses an optical system that does not allow unnecessary infrared rays emitted from a probe or the like to enter the infrared detecting means, thereby essentially reducing the temperature of the probe or the like. This is to realize an infrared thermometer that is not affected by the light, and is radiated from the living body by the reflection surface consisting of a part of the spheroid obtained by rotating the ellipse around the axis that connects the two focal points of the ellipse The body temperature of the living body is measured by using infrared light reflected at one of two focal points shared by the spheroid and the ellipse by reflecting infrared light.

Infrared rays which are reflected at point Ω and reach one focal point with respect to an arbitrary point Ω on the reflecting surface, before the reflection, a line segment connecting the other focal point and point Ω is placed on the focal side. It is only infrared rays that have traveled on a semi-linear line obtained by extension.
Therefore, according to the present invention, an object that emits unnecessary infrared rays such as a probe is arranged at a position that does not intersect with any of the half-lines determined as described above when the point Ω is moved on the reflecting surface. Unnecessary infrared rays can be prevented from entering the infrared detecting means, and the body temperature can be measured accurately.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The infrared thermometer according to the first aspect of the present invention has a reflecting surface which is a part of a spheroid obtained by rotating an ellipse around an axis connecting two focal points of the ellipse. The body temperature of the living body is measured using infrared light that is reflected at one of two focal points shared by the spheroid and the ellipse by reflecting infrared light emitted from the living body.

The infrared ray reflected at the point Ω to an arbitrary point Ω on the reflecting surface and reaching one focal point is a line connecting the other focal point and the point Ω before being reflected. Objects that emit unnecessary infrared rays, such as probes, should be
By disposing at a position that does not intersect with any of the half-lines determined as described above when moving on the reflection surface, it is possible to prevent unnecessary infrared rays from entering the infrared detection means, or at a position that intersects with the half-line By restricting an object that emits unnecessary infrared rays, the influence of the unnecessary infrared rays can be reduced, and the body temperature can be accurately measured.

An infrared thermometer according to a second aspect of the present invention comprises:
A reflecting surface that reflects an infrared ray emitted from a living body, which comprises a part of a spheroid obtained by rotating the ellipse around an axis connecting a first focal point and a second focal point of the ellipse;
Infrared detecting means for detecting infrared light reflected by the reflecting surface and condensed at the first focus or the second focus and converting the infrared light into an electric signal, and calculating the body temperature of the living body using the electric signal output from the infrared detecting means Body temperature calculating means.

Infrared rays, which are reflected at a point Ω to an arbitrary point Ω on the reflecting surface and reach the first focus or the second focus, are not reflected before the other focus and the point Ω. This is limited to infrared rays that have traveled on a semi-straight line obtained by extending the connecting line segment to the focal side, so when an object that emits unnecessary infrared rays such as a probe moves the point Ω on the reflecting surface, Prevent unnecessary infrared rays from entering the infrared detecting means by arranging them at a position that does not intersect with any of the half-lines determined as described above, or restrict objects that emit unnecessary infrared rays that exist at positions that intersect with the half-lines Thus, the influence of unnecessary infrared rays can be reduced, and the body temperature can be measured accurately.

An infrared thermometer according to a third aspect of the present invention comprises:
A temperature-measuring portion determining means for determining a temperature-measuring portion of a living body by determining an incident direction of infrared light by contacting a living body, a point included in the optical field of view of the infrared detecting means among arbitrary points on the reflecting surface. A line segment connecting to the first focal point is provided outside a three-dimensional figure drawn by a set of half-lines obtained by extending the line toward the first focal point, and the infrared detecting means detects infrared light condensed at the second focal point Configuration.

The infrared ray which is reflected at the point Ω and reaches the second focal point with respect to the point Ω included in the optical field of view of the infrared detecting means among the arbitrary points on the reflecting surface is not reflected before the second point. Since the line segment connecting the focal point 1 and the point Ω is extended to the first focal point side, it is limited to infrared rays that have advanced on a semi-linear line obtained.
Unnecessary infrared rays are emitted by arranging the measured temperature site determining means corresponding to the probe in the prior art at a position that does not intersect with any of the half-lines determined as described above when the point Ω is moved on the reflecting surface. It is possible to prevent the light from entering the infrared detection means and accurately measure the body temperature.

An infrared thermometer according to a fourth aspect of the present invention comprises:
A three-dimensional figure drawn by a set of half-lines obtained by extending a line segment connecting a point included in the optical field of view of the infrared detection means and the first focal point among the arbitrary points on the reflecting surface to the first focal point side The temperature-measurement site determining means is provided so that the temperature-measurement site of the living body is located inside the inside.

A line connecting the first focal point and the point Ω with respect to the point Ω included in the optical field of view of the infrared detecting means among any points on the reflecting surface is extended to the first focal point side. The infrared ray that has traveled toward the point Ω on the obtained half-line is reflected at the point Ω and then condensed at the second focal point. Therefore, when the point Ω is moved on the reflecting surface, it is determined as described above. Since the temperature measurement site of the living body is located at a position intersecting with the half line, the infrared radiation emitted from the living body can be favorably focused on the infrared detecting means.

An infrared thermometer according to a fifth aspect of the present invention comprises:
The temperature-measuring portion determining means is provided so that the temperature-measuring portion of the living body is located at the first focal point.

Since the temperature measurement site of the living body coincides with the first focal point, the body temperature can be accurately measured for an extremely minute temperature measurement site such as an inflamed portion of the body surface.

[0027] The infrared thermometer according to claim 6 of the present invention comprises:
The whole or a part of the temperature-measuring portion determining means is constituted by a transparent member, and the temperature-measuring portion of the living body can be visually recognized through the temperature-measuring portion determining means.

Then, by visually recognizing the temperature measurement site of the living body through the temperature measurement site determination means, the temperature measurement site of the living body can be accurately determined to be a very small portion such as an inflamed portion of the body surface. .

[0029] The infrared thermometer according to claim 7 of the present invention comprises:
A through-hole is provided in the temperature-measured part determination means, and the temperature-measured part of the living body can be visually recognized through the through-hole.

By visually recognizing the temperature measurement site of the living body through the through-hole, the temperature measurement site of the living body can be accurately determined to be a very small portion such as an inflamed portion of the body surface.

[0031] The infrared thermometer according to claim 8 of the present invention comprises:
Temperature-measuring portion determining means is provided so that the temperature-measuring portion of the living body is located on a line segment connecting a point included in the optical field of view of the infrared detecting means and the first focus among arbitrary points on the reflecting surface. Configuration.

Since the temperature measurement site has a fixed area instead of a point, a stable temperature measurement result can be obtained even if the temperature measurement site is not determined very accurately.

An infrared thermometer according to a ninth aspect of the present invention comprises:
Of the arbitrary points on the reflecting surface, a line segment connecting the point included in the optical field of view of the infrared detecting means and the first focal point is extended to the first focal point side. The temperature-measured part determining means is provided so that the temperature-measured part of the living body is located in a portion other than the line segment connecting the point and the first focal point.

Since the temperature measurement site has a fixed area instead of a point, a stable temperature measurement result can be obtained without setting the temperature measurement site very accurately.

In the infrared thermometer according to a tenth aspect of the present invention, a focal point, which is closer to the temperature measuring part of the living body determined by the temperature measuring part determining means, is defined as a first focal point among the two focal points of the reflecting surface. A configuration is adopted in which the focus farther from the temperature measurement site is the second focus.

Then, as compared with the case where the positional relationship between the first focal point and the second focal point is determined in reverse, the prospective angle of the temperature measurement site viewed from the first focal point is large, and the first focal point and the measured focal point Since the distance to the warm part is shortened, more infrared light can be collected by the infrared detecting means, and a highly sensitive infrared thermometer can be realized.

The infrared thermometer according to the eleventh aspect of the present invention has a configuration in which the second focal point is displaced from the center line of the temperature-measuring portion determining means.

Since the arrangement of the infrared detecting means is freer than limiting the second focal point to be located on the center line, restrictions on the mechanical design and arrangement of the infrared thermometer can be reduced.

In the infrared thermometer according to the twelfth aspect of the present invention, a line connecting the point included in the optical field of view of the infrared detecting means and the first focal point among the arbitrary points on the reflecting surface is defined as the first focal point. Infrared detecting means is arranged outside the three-dimensional figure drawn by a set of half-lines obtained by extending to the side.

Since the infrared ray detecting means is not located on a line segment through which the infrared ray entering the infrared ray detecting means passes from the temperature measurement site of the living body to the reflecting surface, the infrared ray radiated from the living body is detected. The light can be made incident on the reflecting surface without being disturbed by the presence of the infrared detecting means.

In the infrared thermometer according to a thirteenth aspect of the present invention, the infrared detecting means receives infrared light at the second focal point.

Since the infrared thermometer directly receives the infrared light at the second focal point, the infrared thermometer satisfactorily receives the infrared light radiated from the temperature measurement site of the living body without receiving the unnecessary infrared light radiated from the probe or the like. can do.

An infrared thermometer according to a fourteenth aspect of the present invention is provided with a light guiding means for guiding the infrared light condensed at the second focal point to the infrared detecting means.

Since the arrangement of the infrared detecting means becomes free, mounting and assembling of the infrared thermometer can be easily performed.

An infrared thermometer according to a fifteenth aspect of the present invention is provided with a visual field restricting means for restricting an optical visual field of the infrared detecting means to a range where the reflection surface exists.

By limiting the optical visual field of the infrared detecting means by the visual field limiting means, it is possible to accurately measure the body temperature without detecting unnecessary infrared rays even when using the infrared detecting means having a wide visual field. it can.

In the infrared thermometer according to a sixteenth aspect of the present invention, the temperature-measured part determining means determines the temperature-measured part near the eardrum of the living body by contact with the ear canal.

Since the eardrum is located near the hypothalamus, which is the center of body temperature control, and is well connected to the hypothalamus via blood flow, the temperature-measuring site determining means is placed near the eardrum. By determining the temperature measurement site, the core body temperature of the living body can be measured. At this time, the temperature-measured part determining means necessarily comes into contact with the ear canal and its temperature greatly changes due to heat conduction from the ear canal, but the infrared detecting means emits unnecessary infrared rays radiated from the temperature-measuring part determining means. Since no light is received, the temperature change of the temperature-measured part determining means does not affect the temperature measurement result, and the core body temperature can be measured very accurately.

An infrared thermometer according to a seventeenth aspect of the present invention is provided with a voice notifying means for notifying the body temperature calculated by the body temperature calculating means by voice.

By informing the body temperature by voice, it is possible to realize an infrared thermometer which is easy to use even for a visually impaired person. At this time, even if the time period during which the temperature-measuring portion determining means is brought into contact with the living body by performing the voice notification becomes longer and the temperature of the temperature-measuring portion determining means greatly fluctuates due to heat conduction from the living body, infrared detection is performed. Since the means does not receive unnecessary infrared rays emitted from the temperature-measuring portion determining means, the body temperature can be accurately measured without being affected by the temperature change of the temperature-measuring portion determining means.

The infrared thermometer according to the eighteenth aspect of the present invention is provided with a maximum body temperature detecting means for measuring the body temperature of the living body a plurality of times and detecting the highest value among the individual body temperatures obtained by the plurality of measurements. Configuration.

Then, the body temperature is measured a plurality of times while the temperature measurement site is changed little by little, and the maximum value of the body temperature detected by the maximum body temperature detecting means is regarded as the true body temperature.
The effect of the temperature of the ear canal, which is lower than the temperature of the eardrum, can be reduced, and the eardrum can be more accurately captured and the core body temperature can be measured.
At this time, even if the time for which the temperature-measuring-part determining means is in contact with the living body becomes longer and the temperature of the temperature-measuring-part determining means fluctuates significantly due to heat conduction from the living body, the infrared detecting means remains Since unnecessary infrared rays radiated from the determining means are not received, the body temperature can be accurately measured without being affected by the temperature change of the temperature measurement site determining means.

An infrared thermometer according to a nineteenth aspect of the present invention has a configuration in which a plurality of temperature measurement site determining means can be exchanged.

Further, by exchanging the temperature measurement site determining means that comes into contact with the living body according to the person whose body temperature is to be measured, it is possible to prevent the possibility that bacteria and the like will be contacted and infected via the infrared thermometer. it can. Also, the heat transfer from the living body changes due to the replacement of the temperature measurement site determination means, and the temperature change state of the temperature measurement site determination means may change accordingly. Since unnecessary infrared rays emitted from the site determining means are not received, the body temperature can be accurately measured without being affected by such a change.

An infrared thermometer according to a twentieth aspect of the present invention has a configuration in which a plurality of temperature-measuring portion determining means having different appearances can be exchanged.

Since the appearance of the temperature-measuring portion determining means is different, each temperature-measuring portion determining means can be distinguished at a glance.

An infrared thermometer according to a twenty-first aspect of the present invention has a configuration in which a plurality of temperature measurement site determination means having different materials can be exchanged.

By creating a plurality of temperature-measuring portion determining means using materials having different colors and textures, the temperature-measuring portion having a different appearance can be obtained without painting each of the temperature-measuring portion determining means with a different color. The site determining means can be realized.
Further, since the materials of the individual temperature-measuring portion determining means are different from each other, there is no possibility that the temperature-measuring portion determining means is difficult to be distinguished due to the peeling of the coating or the like. In addition, when the temperature-measuring part determining means is replaced, the material of the temperature-measuring part determining means is different, so that heat conduction from a contact part with the living body such as the external auditory canal changes. Although the state of the change also changes, the body temperature can be accurately measured without being affected by such a change because the infrared detecting means does not receive unnecessary infrared rays radiated from the temperature measuring site determining means.

An infrared thermometer according to a twenty-second aspect of the present invention has a configuration in which a plurality of temperature measurement site determining means having different shapes can be exchanged.

Each of the temperature-measuring site determination means has a different shape, so that it can be easily distinguished. In addition, when the temperature-measuring portion determining means is replaced, the shape of the temperature-measuring portion determining means is different, so that heat conduction from a contact portion with the living body such as the external auditory canal changes. However, since the infrared detecting means does not receive unnecessary infrared rays radiated from the temperature measurement site determining means, the body temperature can be accurately measured without being affected by such a change.

The infrared thermometer according to the twenty-third aspect of the present invention has a configuration in which a plurality of temperature measurement site determination means having different lengths of portions to be inserted into the ear canal can be exchanged.

Since the length of the portion to be inserted into the external auditory canal is different in each of the temperature measurement site determining means, the external auditory canal having a slightly different shape due to the difference between adults and children, men and women, and individual differences. By using the temperature-measuring site determining means suitable for each individual, the temperature-measuring site can be more accurately determined in the vicinity of the eardrum, and the core body temperature can be accurately measured. In addition, since the length of the portion inserted into the external auditory canal at the time of replacement of the temperature measurement site determining means changes, the heat conduction from a site in contact with the living body such as the external auditory canal changes, and the temperature of the temperature measurement site determining means changes accordingly. Although the state of the change also changes, the body temperature can be accurately measured without being affected by such a change because the infrared detecting means does not receive unnecessary infrared rays radiated from the temperature measuring site determining means.

An infrared thermometer according to a twenty-fourth aspect of the present invention has a configuration in which a plurality of temperature-measuring portion determining means having different diameters of portions inserted into the ear canal can be exchanged.

Since each of the temperature-measuring site determining means has a different diameter of a portion inserted into the ear canal, each of the means has a slightly different shape due to differences between adults and children, men and women, and individual differences. By using the temperature-measuring site determining means adapted to the individual, the temperature-measuring site can be more accurately determined in the vicinity of the eardrum, and the core body temperature can be accurately measured. In addition, since the diameter of the portion to be inserted into the ear canal is different when the temperature-measuring part determining means is replaced, heat conduction from a contact part with the living body such as the ear canal changes, and the temperature change of the temperature measuring part determining means accordingly. However, since the infrared detecting means does not receive unnecessary infrared rays radiated from the temperature measurement site determining means, the body temperature can be accurately measured without being affected by such a change.

[0065]

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

(Embodiment 1) FIG. 1 is a configuration diagram of an infrared thermometer according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 11 designates a temperature-measuring site determining means which plays the same role as a probe in a conventional ear-type infrared thermometer, and has a tapered shape toward the eardrum toward the eardrum. Opening 11 serving as a mouth
A is provided. Reference numeral 12 denotes a reflecting surface obtained by mirror-finishing a surface formed of a part of the spheroidal surface formed of resin and applying gold plating, and 13 denotes a narrow-field infrared detecting means for detecting infrared light and converting the intensity into an electric signal. . The infrared detecting means 13 has an optical viewing angle of about 60 ° spreading in a conical shape, and detects only infrared light incident from a direction included in the optical viewing field. Reference numeral 14 denotes a body temperature calculation unit that calculates the body temperature of the living body using the output signal of the infrared detection unit 13. F1 is a first focal point of the reflective surface 12, F2 is a second focal point of the reflective surface 12, Ω1 is an arbitrary point on the reflective surface 12, and L1 is a line segment connecting the point Ω1 and the first focal point F1. The first
L2 is a line segment connecting the point Ω1 and the second focal point F2. The temperature measuring portion determining means 11 has a rotationally symmetric shape, and the first focal point F1 is located above the center line and inside the opening 11A of the temperature measuring portion determining means 11. The second focal point F2 is located inside the opening 11A of the temperature-measured part determining means 11 and at a position away from the center line. Infrared detector 1
3 is so small that it can be considered as a point, and the second focus F
2 are arranged.

FIG. 2 is an explanatory diagram for explaining the shape and properties of the reflection surface 12. In FIG. 2, Ov is an ellipse, F1 is a first focus of the ellipse Ov, and F2 is a second focus of the ellipse Ov. Pa is an arbitrary point on the ellipse Ov, and La is a tangent to the ellipse Ov at the point Pa. La1 is a line segment connecting the first focal point F1 and the point Pa;
a2 is a line segment connecting the second focal point F2 and the point Pa.

Now, the distance between the first focal point F1 and the second focal point F2 is represented by 2c, and the coordinates of the first focal point F1 are (-c,
0), a straight line connecting the first focal point F1 and the second focal point F2 such that the coordinates of the second focal point F2 is (c, 0) is considered as the x-axis, and the ellipse Ov and the x-axis at this time are considered. Are represented by (a, 0) and (−a, 0). Considering the y-axis in a direction perpendicular to the x-axis, when the coordinates of the intersection of the ellipse Ov and the y-axis are represented by (0, b) and (0, -b), the ellipse Ov
The equation is

[0070]

(Equation 1)

Can be expressed as The reflection surface 12 is obtained by cutting out a portion included in the optical field of view of the infrared detecting means 13 from a spheroid obtained by rotating the ellipse Ov around the x-axis.

Positions of the first focal point F1 and the second focal point F2,
In addition, the numerical value a serving as a parameter for determining the size of the ellipse Ov in FIG. 2 is such that even if the point Ω1 is moved to an arbitrary position on the reflecting surface 12,
It is set so as to pass through the opening 11A without intersecting with 1. In other words, the positions of the first focal point F1 and the second focal point F2, and the numerical value a are the temperature measurement parts outside the three-dimensional figure drawn by the half line L1 when the point Ω1 is arbitrarily moved on the reflecting surface 12. It is determined so that the determination means 11 is located. However,
The two focal points F1 and F2 of the reflecting surface 12 are the first focal point F1
Is determined so that the second focal point F2 is closer to the opening 11A than the second focal point F2. Also, a first focus F1 and a second focus F2
Are determined so as not to intersect with the reflecting surface 12.

Next, the operation and operation of the infrared thermometer of FIG. 1 will be described.

When inserted into the external auditory canal, the temperature measurement site determining means 11 makes contact with the external auditory canal so that the length direction of the probe substantially coincides with the direction of the external auditory canal, and places the opening 11A serving as an infrared ray entrance into the ear canal. By directing in the direction, the temperature measurement site of the living body is determined near the eardrum located at the back of the ear canal.

The reflection surface 12 reflects infrared rays emitted from the temperature measurement site of the living body and infrared rays emitted from the temperature measurement site determination means 11.

The infrared detecting means 13 disposed at the second focal point F2 detects only the infrared light incident from the direction included in the optical field of view.
Therefore, only the infrared ray that has reached the second focal point F2 among the infrared rays reflected by the reflection surface 12 is detected and converted into an electric signal, and supplied to the body temperature calculating means 14. The magnitude of the electric signal has a correlation with the temperature of the object that has emitted the infrared ray that has reached the second focal point F2.

Here, a detailed description will be given of where the infrared rays reaching the second focal point F2 are emitted.

In FIG. 2, in general, an ellipse Ov has a line segment L connecting the first focal point F1 and the point Pa with respect to an arbitrary point Pa on the ellipse Ov and a tangent La of the ellipse Ov at the point Pa.
When the angle between a1 and the tangent La is α1, and the angle between the line La2 connecting the second focal point F2 and the point Pa and the tangent La is α2, the geometrical property that α1 = α2 holds. Exists. Therefore, when considering a light beam that has traveled on the line segment La1 through the first focal point F1, if this light beam is reflected at the point Pa, the light beam always travels on the line segment La2 and reaches the second focal point F2. .

For this reason, returning to FIG. 1, on the reflection surface 12, which is a part of the spheroid obtained by rotating the ellipse Ov around its long axis, that is, the axis connecting the two focal points F1 and F2, A line segment L2 reflected at an arbitrary point Ω1 on the reflection surface 12
When the infrared ray that reaches the second focal point F2 through the above is traced back before being reflected at the point Ω1, the point Ω1 and the first
It can be seen that the line segment connecting to the focal point F1 has been extended on the half line L1 obtained by extending the line segment to the first focal point F1 side. Since the half-line L1 passes through the opening 11A without intersecting with the temperature-measured part determining means 11, the infrared ray reflected at the point Ω1 and reaching the second focal point F2 is emitted from the temperature-measuring part determining means 11. Instead, it is emitted from the temperature measurement site of the living body. Since this relationship holds even when the point Ω1 is arbitrarily moved on the reflection surface 12, all the infrared rays reaching the second focal point F2 are emitted from the temperature measurement site of the living body, and the temperature measurement site The infrared rays emitted from the determining means 11 are not included.

The body temperature calculating means 14 includes the infrared detecting means 13
Is used to calculate the temperature of the object that has emitted the infrared ray that has reached the second focal point F2, that is, the temperature of the temperature measurement site of the living body.

Strictly speaking, the magnitude of the output signal of the infrared detecting means 13 is affected by the temperature of the infrared detecting means 13 itself. Therefore, when the body temperature calculating means 14 calculates the temperature, the body temperature measured by a thermistor or the like is used. It is preferable to use the temperature of the calculating means 14 as a correction term. However, such a temperature calculating method may use a conventional technique as it is, and is not related to the subject of the present invention, so that detailed description is omitted.

According to the infrared thermometer of this embodiment, the reflection surface 12 which is a part of a spheroid is used as an optical system for condensing infrared rays radiated from a site to be measured of a living body, and the second focal point F2 The infrared light detected by the infrared detection means 13 can be limited to only the infrared light passing through the first focal point F1 by detecting the infrared light by the narrow-field infrared light detection means 13 disposed in the area. By providing the temperature measurement site determining means 11 outside the infrared light path so that the temperature measurement site of the living body is located on the road, the infrared radiation radiated from the temperature measurement site of the living body can be detected by the infrared detection means 1.
In addition to focusing the light on the body 3, unnecessary infrared rays radiated from the temperature-measured portion determining means 11 can be prevented from entering the infrared detecting means 13 satisfactorily, and the body temperature of the living body can be accurately measured.

Further, since the eardrum is located near the hypothalamus, which is the center of temperature control of the living body, and is well connected to the hypothalamus via blood flow, the temperature measurement site determining means 11 is located near the eardrum. By determining the temperature measurement site, the core body temperature of the living body can be measured. At this time, the temperature-measuring portion determining means 11 inevitably comes into contact with the ear canal and its temperature greatly changes due to heat conduction from the ear canal. Since the result is not affected, the core body temperature can be measured very accurately.

A reflecting mirror having a spheroidal surface is usually used to condense light rays emitted from a point light source to one point. In the infrared thermometer of this embodiment, the light source, that is, the temperature measurement site of the living body is used. Since it is located farther from the reflecting surface 12 than the first focal point F1, only the infrared rays emitted from one point of the living body are not focused on the second focal point F2, but the temperature measurement site having a certain area Of the infrared rays emitted from the infrared ray, those that have once passed through the first focal point F1 are condensed at the second focal point F2, and are detected by the infrared ray detecting means 13. Therefore, even if the manner of contact between the temperature measurement site determining means 11 and the ear canal changes due to shaking of the user's hand, etc., and the position of the temperature measurement site slightly changes, most of the temperature measurement site remains Since it is common before and after the fluctuation, it is possible to favorably prevent the measurement result of the body temperature from largely fluctuating. Further, for the same reason, when the user inserts the temperature-measured part determining means 11 into the external auditory canal, it is not necessary to take a long time and carefully determine the direction of the temperature-measured part determining means 11, and the infrared thermometer is further increased. It can be easily used.

The two focal points F of the reflecting surface 12
1, F2, the first focal point F1 is the temperature-measured part determining means 11
The second focal point F2 is shifted toward the opening 1A closer to the opening 11A.
Since the distance is set far from 1A, the prospective angle of the temperature measurement part of the living body viewed from the first focal point F1 is larger than the case where it is determined reversely, and the first focal point F1 and the temperature measurement part , The amount of infrared rays incident on the infrared detecting means 13 can be increased, and a highly sensitive infrared thermometer can be realized.

Further, since the second focal point F2 is set at a position distant from the center line of the temperature-measured part determining means 11, the arrangement of the infrared detecting means 13 is smaller than limiting the second focal point F2 to the center line. Is free, and restrictions on the mechanical design and arrangement of the infrared thermometer can be reduced.

The reflecting surface 12 is arranged such that a straight line connecting the first focal point F1 and the second focal point F2 does not intersect with the reflecting surface 12.
Are arranged, the infrared detecting means 13 is located outside the three-dimensional figure drawn by the half line L1 when the point Ω1 is moved on the reflecting surface 12. Therefore, the first focus F1
Infrared rays passing through the reflection surface 12 can be made incident on the reflection surface 12 without being disturbed by the infrared detection means 13.

The spheroidal surface of the reflecting surface 12 may be obtained by shaving a metal instead of molding with a resin, and the metal to be plated on the surface is not necessarily gold. It is only necessary that the metal has a high reflectivity and a small change in reflectivity due to surface deterioration due to oxidation or the like.

If the optical field of view of the infrared detecting means 13 is too wide and the reflecting surface 12 cannot be present in the entire optical field of view, the infrared detecting means 13 and the reflecting surface 12
A field-of-view restricting means (not shown) for restricting the effective field of view of the infrared detecting means 13 may be provided in between. Specifically, this view restriction means can be easily realized by a stop composed of a black body wall and holes. When such a visual field limiting means is provided, infrared rays emitted from the visual field limiting means in addition to the infrared rays reflected by the reflection surface 12 are incident on the infrared detecting means 13. 1
3 and close thermal coupling between them,
It is possible to easily reduce the influence of infrared rays emitted from the visual field limiting means.

Further, it is not necessary to strictly cut out only the portion of the spheroidal surface included in the optical field of view of the infrared detecting means 13, and to use the portion of the reflecting surface 12 included in the optical field of view of the infrared detecting means 13. What is necessary is just to cut out so that it may include all. When the reflection surface 12 is large, the point Ω1 is included in the optical field of the infrared detecting means 13 among the arbitrary points on the reflection surface 12 instead of arbitrarily moving the point Ω1 on the reflection surface 12. Can be considered as a

(Embodiment 2) FIG. 3 is a configuration diagram of an infrared thermometer according to Embodiment 2 of the present invention.

In FIG. 3, reference numeral 22 denotes a reflecting surface which is a part of a spheroidal surface, and reference numeral 25 denotes a cylindrical light guide tube whose inner surface is mirror-finished and plated with gold. F3 is a first focal point of the reflecting surface 22, and F4 is a second focal point of the reflecting surface 22. The light guide tube 25 guides the infrared light condensed at the second focal point F4 to the infrared detecting means 13 arranged at another place. Ω2 is an arbitrary point on the reflection surface 22. In addition, the same reference numerals are given to the same components as those in FIG.

The reflecting surface 22 of the present embodiment differs from the reflecting surface 12 of the first embodiment only in that the first focal point F3 is located outside the opening 11A. Positions of the first focal point F3 and the second focal point F4 that determine the reflecting surface 22, and the reflecting surface 2
The shape of the spheroid defining 2 is determined as follows.
In other words, the first focal point F3 is set at a position above the center line of the temperature-measured part determining means 11, outside the opening 11A of the temperature-measuring part determining means 11, and farther from the temperature measuring part of the living body. In addition, the second focal point F4 is set inside the opening 11A of the temperature-measured part determination means 11 at a position away from the center line. Further, even if the point Ω2 is moved to an arbitrary position on the reflection surface 22, the line connecting the point Ω2 and the first focal point F3 never intersects with the temperature-measured part determination means 11 and the opening 11A
Is determined to pass through. In other words, when the point Ω <b> 2 is arbitrarily moved on the reflection surface 22, the temperature measurement site determination unit 11 is determined to be located outside the three-dimensional figure drawn by the line segment. The reflecting surface 22 is cut out from a spheroid so as to cover the entire effective optical field of view of the infrared detecting means 13 at the second focal point F4 obtained in consideration of the reflection by the inner surface of the light guide tube 25.

In the present embodiment, unlike the first embodiment, the infrared rays emitted from one point in the temperature measurement site are reflected by the reflecting surface 22 without being focused on the first focal point F3. Focusing on the infrared rays reflected by the reflection surface 22 at the point Ω2 and reaching the second focal point F4, the infrared rays have traveled on the line connecting the first focal point F3 and the point Ω2 before reflection. Is guaranteed. That is, the temperature measurement site determining means 1
Infrared rays emitted from No. 1 are not included at all, and it is guaranteed that only infrared rays emitted from a temperature measurement site of a living body are included.
Then, even if the point Ω2 is arbitrarily moved on the reflection surface 22, the same is guaranteed, so that only the infrared rays emitted from the temperature measurement site of the living body and collected at the second focal point F4 are collected. Become.

The light guide tube 25 reflects the infrared light condensed at the second focal point F 4 on its inner surface and guides it to the infrared detecting means 13.

The infrared detecting means 13 detects the infrared light guided by the light guide tube 25 and converts it into an electric signal.

The operation of the body temperature calculating means 14 is the same as that of the first embodiment, and a detailed description will be omitted.

According to the present embodiment, even if the first focal point F3 is located farther from the temperature measuring portion of the living body and the reflecting surface 22 having a longer focal length is used, the temperature measuring portion determining means 11 radiates the light. It is possible to realize an infrared thermometer capable of accurately measuring the temperature of a living body without being affected by the infrared rays.

Further, instead of directly receiving infrared rays by the infrared detecting means 13 on the second focal point F4, the light guide tube 2 is not used.
Since the infrared ray is guided to the infrared ray detecting means 13 arranged at another place by 5 and then detected, the arrangement of the infrared ray detecting means 13 becomes free, and restrictions on the mechanical design and arrangement of the infrared thermometer can be reduced. .

(Embodiment 3) FIG. 4 is a configuration diagram of an infrared thermometer according to Embodiment 3 of the present invention. The infrared thermometer of this embodiment measures not the ear type but the temperature of an arbitrary skin surface such as an arm.

In FIG. 4, reference numeral 31 denotes a temperature-measuring portion determining means formed of transparent plastic, and has a circular opening 31A at the tip. 32 is a reflection surface, F5
Is a first focal point of the reflecting surface 32, and F6 is a second focal point of the reflecting surface 32. In addition, the infrared detecting means 13 has a second focus F
6. In addition, the same components as those in the first embodiment are denoted by the same reference numerals.

The reflecting surface 32 is different from the reflecting surface 12 of the first embodiment in that the first focal point F5 is located at the center of the circle formed by the opening 11A of the temperature-measuring portion determining means 11, and The only difference is that the temperature-measured part determination means 31 is arranged so as not to exist on the line segment connecting the arbitrary point and the first focal point F5.

The operation of the infrared thermometer of this embodiment will be described below.
The operation will be described.

The temperature-measured part determining means 31 includes an opening 31A.
Is brought into contact with the skin surface of the living body to determine a temperature measurement site on the skin surface located at the center of the opening 31A. At this time, the user of the infrared thermometer, if there is a part where the temperature is to be measured, such as an inflamed part, through the transparent temperature-measuring part determining means 31, which part of the skin should have the opening 31A.
It can be determined while confirming whether or not it is at the center of the target while visually recognizing the temperature measurement site. As a result, the temperature measurement site is located at the first focal point F5 of the reflection surface 32.

The reflection surface 32 reflects infrared rays radiated from the temperature measurement site determined to be located at the first focal point F5, and focuses the infrared rays on the second focal point F6.

In general, a reflecting surface composed of a spheroidal surface converges light rays emitted from one focal point to the other focal point, so that infrared rays emitted from the first focal point F5 and reflected by the reflecting surface 32 are reflected by the second focal point. The light is focused on the focal point F6. Further, since the temperature-measured portion determining means 31 does not exist on a line segment connecting an arbitrary point on the reflection surface 32 and the first focal point F5, the infrared ray condensed at the second focal point F6 is not covered by the infrared ray. The infrared rays emitted from the temperature measurement site determining means 31 are not included.

The infrared detecting means 13 arranged at the second focal point F2 detects this infrared ray and converts it into an electric signal.

The operation and operation of the body temperature calculating means 14 are the same as those in the first embodiment.
Therefore, the detailed description is omitted.

According to the present embodiment, since the temperature measurement site of the living body coincides with the first focal point F5, the temperature of the extremely minute temperature measurement site such as the inflamed part of the skin surface of the living body can be reduced. It becomes possible to measure accurately.

Further, since the temperature-measuring portion determining means 31 is formed of transparent plastic, the temperature-measuring portion determining means 3 is formed of transparent plastic.
The temperature measurement site can be accurately determined while visually confirming through the step 1.

Instead of making the temperature-measuring portion determining means 31 as a whole transparent, an opaque coating is applied to the portion other than the vicinity of the opening 31A of the temperature-measuring portion determining means 31 formed of transparent plastic. 31A required for visual recognition
Temperature measurement site determination means 3 such as leaving only the vicinity transparent
Only a part of 1 may be transparent.

Further, if several through holes are provided on the side surface of the temperature measuring portion determining means 31 so that the temperature measuring portion can be visually recognized through the through holes, the temperature measuring portion determining means 31 can be made of a transparent material. The same effect can be obtained without molding.

(Embodiment 4) FIG. 5 is a configuration diagram of an infrared thermometer according to Embodiment 4 of the present invention.

In FIG. 5, reference numeral 46 denotes a maximum body temperature detecting means for detecting the highest value of the body temperature of the living body measured a plurality of times, and a body temperature storing means 4 for storing individual body temperatures therein.
6A, and a maximum value detection means 46B for detecting the maximum body temperature stored in the body temperature storage means 46A.
Reference numeral 47 denotes a voice notifying unit for notifying the body temperature by voice synthesis. Further, the infrared detecting means 13 is disposed at the second focal point F2 of the reflection surface 12. In addition, the same components as those in the first embodiment are denoted by the same reference numerals.

Next, the operation and operation of the infrared thermometer of this embodiment will be described.

When inserted into the ear canal, the temperature-measured part determining means 11 makes contact with the ear canal, makes the length direction of the probe substantially coincide with the direction of the ear canal, and places the opening portion 11A serving as an infrared ray entrance into the back of the ear canal. By directing in the direction, the temperature measurement site of the living body is determined near the eardrum located at the back of the ear canal.

The reflection surface 12 focuses only the infrared radiation radiated from the temperature measurement site of the living body on the infrared detection means 13 in the same manner as in the first embodiment.

The infrared detecting means 13 detects the infrared rays, converts them into electric signals, and supplies them to the body temperature calculating means 14.

The body temperature calculating means 14 includes the infrared detecting means 13
The body temperature of the living body is calculated by using the electric signal supplied from.

The maximum body temperature detecting means 46 causes the body temperature calculating means 14 to calculate the body temperature every second for 10 seconds.
The calculated values of the body temperatures are stored in the body temperature storage means 46A. When the body temperature is stored ten times in the body temperature storage means 46A,
The maximum body temperature detecting means 46 causes the body temperature calculating means 14 to stop calculating the body temperature. Thereafter, the maximum value detecting means 46B searches for the largest value among the body temperatures stored in the body temperature storing means 46A, and outputs the found largest value to the audio notifying means 47.

The voice notifying means 47 converts the body temperature supplied from the maximum value detecting means 46B into a voice by voice synthesis and notifies the user of the converted temperature.

According to this embodiment, during measurement of body temperature, the user moves the temperature-measured part determining means 11 little by little, and the body temperature is measured a plurality of times while changing the temperature-measured part little by little. The value is stored in the body temperature storage means 46A, and the maximum value is detected by the maximum value detection means 46B and regarded as the true body temperature, thereby reducing the influence of the temperature of the ear canal, which is lower in temperature than the eardrum, and It is possible to accurately measure the deep body temperature by accurately capturing the eardrum. At this time, even if the time during which the temperature-measuring portion determining means 11 is in contact with the living body becomes long and the temperature of the temperature-measuring portion determining means 11 fluctuates significantly due to heat conduction from the living body, the infrared detecting means 13 will still be Since unnecessary infrared rays emitted from the temperature measurement site determining means 11 are not received, the body temperature can be accurately measured without being affected by the temperature change of the temperature measurement site determining means 11.

Further, since the body temperature is notified by sound using the sound notifying means 47, an infrared thermometer which is easy to use even for the visually impaired can be realized. Then, at this time, it is assumed that the time period during which the temperature-measured part determination means 11 is in contact with the living body by performing the voice notification increases, and the temperature of the temperature-measured part determination means 11 greatly fluctuates due to heat conduction from the living body. Since the infrared detecting means 13 does not receive unnecessary infrared rays radiated from the temperature-measuring portion determining means 11, the body temperature can be accurately measured without being affected by the temperature change of the temperature-measuring portion determining means 11. it can.

(Embodiment 5) FIG. 6 is a configuration diagram of an infrared thermometer according to Embodiment 5 of the present invention.

In FIG. 6, reference numeral 51 denotes a temperature-measuring site determining means which plays the same role as a probe in a conventional ear-type infrared thermometer, and has a shape tapered toward the eardrum toward the eardrum. Opening 11 serving as a mouth
A body 5 having a reflective surface 12, an infrared detecting means 13, and a body temperature calculating means 14 having an end opposite to the opening 11A.
8 is provided with a protrusion 51B so as to be detachable therefrom. In addition, the same components as those in the first embodiment are denoted by the same reference numerals.

When attaching the temperature-measuring portion determining means 51 to the main body 58, the projection 51B of the temperature-measuring portion determining means 51
By pressing the vicinity from the side with a finger, the protrusion 51 </ b> B is distorted inward by this pressing force and is attached to the main body 58. When detaching, the protrusion 51B is similarly distorted inward by pushing the temperature-measured part determination means 51 with a finger from the side, and is detached.

As described above, the temperature-measuring portion determining means 51 is made detachable, and as shown in FIG. 7, a plurality of temperature-measuring portion determining means 51 having different appearances are provided.
Make it easy for the user to exchange. FIG.
Is a conceptual description of preparing a plurality of temperature measurement site determining means 51 having different appearances, and a projection 51B for attaching to the main body 58 is omitted in the drawing. In FIG. 7, (a) is four types of temperature measurement site determination means 51, white, (b) is yellow, (c) is blue, and (d) is black. For example, in the case where an infrared thermometer is used in a family of four people, the temperature measurement site determining means 5 used by each individual
One color is determined in advance and used.

According to this embodiment, since the temperature measurement site determining means 51 that comes into contact with the skin surface does not need to be shared with another person, it is possible to prevent the possibility that bacteria and the like will be infected by contact via the infrared thermometer. Can be. The heat conduction from the living body changes with the replacement of the temperature-measured part determining means 51, and the state of the temperature change of the temperature-measured part determining means 51 may change. Part determination means 51
Since it does not receive unnecessary infrared rays emitted from the body, it is possible to accurately measure body temperature without being affected by such changes.

Note that FIGS. 7 (a), (b), (c),
Each of the temperature measurement site determination means 51 of (d) may be formed by forming the same material and then coating the surface with each color. It may be. If the temperature-measuring portion determining means 51 is made of a different material as described above, there is no danger that the temperature-measuring portion determining means 51 becomes difficult to distinguish due to peeling of the coating or the like.
In addition, when the temperature measurement site determining means 51 is replaced, heat conduction from a site in contact with a living body such as the external auditory canal changes due to a difference in material, and the temperature change state of the temperature measurement site determining means 51 changes accordingly. However, since the infrared detecting means 13 does not receive unnecessary infrared rays radiated from the measured temperature site determining means 51, the body temperature can be accurately measured without being affected by such a change.

Instead of preparing a plurality of temperature-measuring site determining means 51 in different colors, ones having different lengths and diameters of portions to be inserted into the ear canal may be prepared.
In this way, not only can each temperature-measured portion determining means 51 be distinguished by a difference in shape, but also each ear canal has a slightly different shape due to differences between adults and children, men and women, and individual differences. By using the temperature measurement site determining means 51 that conforms to the above, the temperature measurement site can be determined more accurately near the eardrum and the core body temperature can be measured accurately. In addition, when the temperature measurement site determining means 51 is replaced, heat conduction from a site in contact with the living body such as the ear canal changes due to a difference in shape, and the temperature change state of the temperature measurement site determining means 51 changes accordingly. Since the infrared detecting means 13 does not receive unnecessary infrared rays radiated from the measured temperature site determining means 51, the body temperature can be accurately measured without being affected by such a change.

[0131]

According to the infrared thermometer according to the first aspect of the present invention, an ellipse is rotated from a living body by a reflection surface which is a part of a spheroid obtained by rotating an ellipse around an axis connecting two focal points of the ellipse. The body temperature of the living body is measured by using the infrared rays condensed at one of the two focal points shared by the spheroid and the ellipse by reflecting the emitted infrared rays. Infrared rays that are reflected at point Ω and reach one focal point are limited to infrared rays that have traveled on a half-line obtained by extending the line segment connecting the other focal point and point Ω to the focal point side before being reflected. By using the geometrical property of being able to move, place an object such as a probe that emits unnecessary infrared rays at a position that does not intersect with any of the half-lines determined as described above when the point Ω is moved on the reflecting surface. Unnecessary infrared rays are detected by infrared Or prevented from entering the stage,
By restricting an object that emits unnecessary infrared rays at a position intersecting with the half-line, the effect of unnecessary infrared rays can be reduced, and the body temperature can be accurately measured.

The infrared thermometer according to claim 2 of the present invention
A reflecting surface that reflects an infrared ray emitted from a living body, which comprises a part of a spheroid obtained by rotating the ellipse around an axis connecting a first focal point and a second focal point of the ellipse;
Infrared detecting means for detecting infrared light reflected by the reflecting surface and condensed at the first focus or the second focus and converting the infrared light into an electric signal, and calculating the body temperature of the living body using the electric signal output from the infrared detecting means Since the body temperature calculating means is provided, an infrared ray which is reflected at an arbitrary point Ω on the reflecting surface at the point Ω and reaches the first focal point or the second focal point is not reflected before the other focal point. Utilizing the geometric property of being limited to infrared rays that have traveled on a half line obtained by extending the line segment connecting the By disposing at a position that does not intersect with any of the half-lines determined as described above when moving on the reflecting surface, it is possible to prevent unnecessary infrared rays from entering the infrared detection means, or at a position that intersects with the half-line Emit unnecessary infrared rays To reduce the effects of unwanted infrared radiation by limiting the object to be an effect that the temperature can be accurately measured.

An infrared thermometer according to a third aspect of the present invention comprises:
A temperature-measuring portion determining means for determining a temperature-measuring portion of a living body by determining an incident direction of infrared light by contacting a living body, a point included in the optical field of view of the infrared detecting means among arbitrary points on the reflecting surface. A line segment connecting to the first focal point is provided outside a three-dimensional figure drawn by a set of half-lines obtained by extending the line toward the first focal point, and the infrared detecting means detects infrared light condensed at the second focal point Therefore, among the arbitrary points on the reflecting surface, the infrared ray reflected at the point Ω to the point Ω included in the optical field of view of the infrared detecting means and reaching the second focal point is not reflected before. Utilizing the geometric property that the line segment connecting the first focal point and the point .OMEGA. When the point Ω is moved on the reflecting surface, Unwanted infrared is prevented from entering the infrared ray detecting means by placing the to not intersect with any of the half-line which is determined in position as an effect that the temperature can be accurately measured.

An infrared thermometer according to a fourth aspect of the present invention comprises:
A three-dimensional figure drawn by a set of half-lines obtained by extending a line segment connecting a point included in the optical field of view of the infrared detection means and the first focal point among the arbitrary points on the reflecting surface to the first focal point side Since the temperature-measuring site determining means is provided so as to locate the temperature-measuring site of the living body inside the object, the point Ω included in the optical field of view of the infrared detecting means among any points on the reflection surface Then, the infrared ray that has traveled toward the point Ω on a half line obtained by extending the line segment connecting the first focal point and the point Ω to the first focal point side is reflected at the point Ω, and then reflected at the second focal point. Utilizing the geometrical property of condensing, the temperature measurement site of the living body will be located at the position that intersects with the half line determined as described above when the point Ω is moved on the reflecting surface, There is an effect that the emitted infrared light can be favorably focused on the infrared detecting means.

An infrared thermometer according to a fifth aspect of the present invention comprises:
Since the temperature-measuring portion determining means is provided so that the temperature-measuring portion of the living body is located at the first focal point, extremely minute temperature-measuring portions such as inflamed portions of the surface of the living body are used There is an effect that the body temperature can be accurately measured.

An infrared thermometer according to a sixth aspect of the present invention comprises:
The whole or a part of the temperature measurement site determining means is made of a transparent member, and the temperature measurement site of the living body is configured to be visible through the temperature measurement site determining means. There is an effect that the site can be accurately determined to be a minute portion such as a portion where inflammation occurs.

An infrared thermometer according to a seventh aspect of the present invention comprises:
A through-hole is provided in the temperature-measuring site determination means, and the temperature-measuring site of the living body is configured to be visible through the through-hole. There is an effect that the part can be accurately determined.

An infrared thermometer according to claim 8 of the present invention is
Temperature-measuring portion determining means is provided so that the temperature-measuring portion of the living body is located on a line segment connecting a point included in the optical field of view of the infrared detecting means and the first focus among arbitrary points on the reflecting surface. With such a configuration, the temperature measurement site has a fixed area instead of a point, and there is an effect that a stable temperature measurement result can be obtained even if the temperature measurement site is not determined very accurately.

An infrared thermometer according to a ninth aspect of the present invention comprises:
Of the arbitrary points on the reflecting surface, a line segment connecting the point included in the optical field of view of the infrared detecting means and the first focal point is extended to the first focal point side. Since the temperature-measuring portion determining means is provided so that the temperature-measuring portion of the living body is located in a portion other than the line segment connecting the point and the first focal point, the temperature-measuring portion is not a point but a fixed area. Therefore, there is an effect that a stable temperature measurement result can be obtained even when the temperature measurement site is not determined very accurately.

In the infrared thermometer according to the tenth aspect of the present invention, of the two focal points of the reflecting surface, a focal point closer to the temperature measuring portion of the living body determined by the temperature measuring portion determining means is set as the first focal point. Since the focus farther from the temperature measurement site is set as the second focus, more infrared light is collected by the infrared detection means than when the positional relationship between the first focus and the second focus is determined in reverse. Light can be emitted, and an infrared thermometer with high sensitivity can be realized.

The infrared thermometer according to the eleventh aspect of the present invention has a configuration in which the second focal point is displaced from the center line of the temperature-measuring portion determining means, so that the second focal point is located on this center line. The arrangement of the infrared detecting means is more flexible than that of the infrared thermometer, and there is an effect that restrictions on the mechanical design and arrangement of the infrared thermometer can be reduced.

In the infrared thermometer according to the twelfth aspect of the present invention, a line connecting the point included in the optical field of view of the infrared detecting means and the first focal point among the arbitrary points on the reflecting surface is defined as the first focal point. Since the infrared detection means is arranged outside the three-dimensional figure drawn by the set of half-lines obtained by extending to the side,
There is an effect that infrared rays radiated from a living body can be made to enter the reflecting surface without being disturbed by the presence of the infrared detecting means.

In the infrared thermometer according to the thirteenth aspect of the present invention, since the infrared detecting means is configured to receive the infrared light at the second focal point, the infrared thermometer does not receive unnecessary infrared light emitted from a probe or the like. There is an effect that infrared rays emitted from the temperature measurement site can be favorably received.

Since the infrared thermometer according to the fourteenth aspect of the present invention is provided with the light guiding means for guiding the infrared light condensed at the second focus to the infrared detecting means, the arrangement of the infrared detecting means is free. Therefore, there is an effect that mounting and assembling of the infrared thermometer can be easily performed.

Since the infrared thermometer according to the fifteenth aspect of the present invention is provided with the visual field restricting means for restricting the optical visual field of the infrared detecting means to the range where the reflection surface exists, the infrared thermometer having a wide visual field is provided. Even when used, there is an effect that the body temperature can be accurately measured without detecting unnecessary infrared rays.

In the infrared thermometer according to a sixteenth aspect of the present invention, the temperature measurement site determining means is configured to determine the temperature measurement site near the eardrum of the living body by contact with the external auditory canal. A temperature measurement site can be defined near the eardrum, which is thermally coupled well, and the body temperature can be measured deeply, and the temperature measurement site determination means inevitably comes into contact with the ear canal and heat from the ear canal Even if the temperature greatly changes due to conduction, the infrared detection means does not receive unnecessary infrared rays radiated from the temperature measurement site determination means, so the temperature change of the temperature measurement site determination means does not affect the temperature measurement result, There is an effect that a temperature measurement result can be obtained extremely accurately.

Since the infrared thermometer according to the seventeenth aspect of the present invention is provided with the voice notifying means for notifying the body temperature calculated by the body temperature calculating means by voice, it is easy to use even for a person who is blind. In addition to the effect that an infrared thermometer can be realized, the time during which the temperature-measuring portion determining means is in contact with the living body is increased by performing audio notification, and heat conduction from the living body causes the temperature-measuring portion determining means to have an effect. Even if the temperature fluctuates significantly, the infrared detecting means does not receive unnecessary infrared rays radiated from the temperature measuring part determining means, so that the body temperature can be accurately measured without being affected by the temperature change of the temperature measuring part determining means. There is an effect that measurement can be performed.

The infrared thermometer according to the eighteenth aspect of the present invention is provided with a maximum body temperature detecting means for measuring the body temperature of the living body a plurality of times and detecting the highest value among the individual body temperatures obtained by the plurality of measurements. In addition, the effect of reducing the temperature of the ear canal, which is lower than the eardrum, has the effect of being able to more accurately capture the eardrum and measure the core body temperature. Even if the temperature of the temperature-measuring part determining means fluctuates significantly due to the heat conduction from the living body due to the longer time of contact with the object, the infrared detecting means receives unnecessary infrared rays radiated from the temperature-measuring part determining means. Therefore, there is an effect that the body temperature can be accurately measured without being affected by the temperature change of the temperature measurement site determining means.

Since the infrared thermometer according to the nineteenth aspect of the present invention has a configuration in which a plurality of temperature-measuring portion determining means can be exchanged, the temperature-measuring portion determining means that comes into contact with the living body is to be measured for the body temperature of the person. Exchange according to the effect of preventing the possibility of contact infection of bacteria etc. via the infrared thermometer beforehand, and the exchange of the temperature measurement site determination means changes the heat conduction from the living body. However, even if the temperature change of the temperature-measuring portion determining means changes accordingly, the infrared detecting means does not receive unnecessary infrared rays radiated from the temperature-measuring portion determining means, and thus is affected by such a change. There is an effect that the body temperature can be accurately measured without the need.

Since the infrared thermometer according to the twentieth aspect of the present invention has a configuration in which a plurality of temperature-measuring portion determining means having different appearances are exchangeable, each temperature-measuring portion determining means can be distinguished at a glance. This has the effect.

Since the infrared thermometer according to the twenty-first aspect of the present invention has a structure in which a plurality of temperature-measuring portion determining means having different materials are interchangeable, a plurality of temperature-measuring portion determining means having different colors and textures are used. Has the effect that it is possible to realize a temperature-measuring portion determining means having a different appearance without painting each temperature-measuring portion determining means with a different color. Further, there is an effect that there is no possibility that it becomes difficult to distinguish the temperature measurement site determining means due to peeling of the paint or the like. Also, even if the heat conduction from the contact part with the living body such as the external auditory canal changes due to the replacement of the temperature measurement site determination means, and the temperature change state of the temperature measurement site determination means changes accordingly, the infrared detection means Does not receive unnecessary infrared rays radiated from the temperature-measuring portion determining means, and thus has an effect that the body temperature can be accurately measured without being affected by such a change.

Since the infrared thermometer according to the twenty-second aspect of the present invention has a configuration in which a plurality of temperature-measuring portion determining means having different shapes can be exchanged, each of the temperature-measuring portion determining means can be easily distinguished. At the same time, the heat transfer from the contact area with the living body such as the external auditory canal changes due to the change in the shape of the temperature measurement site determining means due to the exchange of the temperature measurement site determination means. Even if the temperature change of the determination means changes, the infrared detection means does not receive unnecessary infrared rays radiated from the temperature measurement site determination means, so that the body temperature should be accurately measured without being affected by such changes. There is an effect that can be.

The infrared thermometer according to the twenty-third aspect of the present invention has a configuration in which a plurality of temperature-measuring site determining means having different lengths to be inserted into the ear canal can be exchanged. In the ear canal, which has a slightly different shape due to differences such as individual differences, etc., there is an effect that it is possible to accurately measure the core body temperature using the temperature measurement site determination means suitable for each individual, Even if the heat transfer from the contact part with the living body such as the external auditory canal changes due to the replacement of the temperature measuring part determining means, and the temperature change state of the temperature measuring part determining means changes accordingly, the infrared detecting means will Since unnecessary infrared rays emitted from the site determining means are not received, there is an effect that the body temperature can be accurately measured without being affected by such a change.

The infrared thermometer according to the twenty-fourth aspect of the present invention has a configuration in which a plurality of temperature-measuring site determining means having different diameters of portions to be inserted into the ear canal can be exchanged, so that adults and children, men and women, etc. For the ear canal whose shape is slightly different due to the difference between individuals and individual differences, by using the temperature measurement site determination means suitable for each individual, there is an effect that it is possible to accurately measure the core body temperature, Even if the heat transfer from the contact part with the living body such as the external auditory canal changes due to the replacement of the temperature measurement site determination means, and the temperature change of the temperature measurement site determination means changes accordingly, the infrared detection Since unnecessary infrared rays emitted from the warm part determining means are not received, there is an effect that the body temperature can be accurately measured without being affected by such a change.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an infrared thermometer according to a first embodiment of the present invention.

FIG. 2 is an explanatory view for explaining the shape and properties of a reflection surface 12 of the infrared thermometer.

FIG. 3 is a configuration diagram of an infrared thermometer according to a second embodiment of the present invention.

FIG. 4 is a layout diagram of components of an infrared thermometer according to a third embodiment of the present invention.

FIG. 5 is a layout diagram of components of an infrared thermometer according to a fourth embodiment of the present invention.

FIG. 6 is a layout diagram of components of an infrared thermometer according to a fifth embodiment of the present invention.

7 (a) to 7 (d) are schematic diagrams of a plurality of temperature measurement site determining means of the infrared thermometer.

FIG. 8 is a configuration diagram of a conventional infrared thermometer.

[Explanation of symbols]

 11, 31, 51 Temperature-measured part determination means 12, 22, 32 Reflecting surface 13 Infrared ray detection means 14 Body temperature calculation means 25 Light guide tube 46 Maximum body temperature detection means 47 Voice notification means F1, F3, F5 First focus F2, F4, F6 Second focus

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makoto Shibuya 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. Term (reference) 2G066 AC13 BA01 BA08 BA09 BA25 BB01 BB11 CA16

Claims (24)

[Claims] An ellipse is formed by rotating an ellipse around an axis connecting two focal points of the ellipse and reflecting an infrared ray emitted from a living body by a reflection surface which is a part of a spheroid obtained by rotating the ellipse. An infrared thermometer for measuring a body temperature of a living body using infrared light focused on one of the two focal points shared by the ellipse and the ellipse. 2. The method according to claim 1, wherein the ellipse has a first focus and a second focus.
A reflecting surface which is formed by a part of a spheroid obtained by rotating about an axis connecting the focal point and reflects infrared rays emitted from a living body; and the first focal point or the second reflecting surface reflected by the reflecting surface. 2. An infrared detecting means for detecting infrared light condensed at a focal point of the living body and converting the infrared light into an electric signal, and a body temperature calculating means for calculating a body temperature of a living body using the electric signal output from the infrared detecting means. Infrared thermometer. 3. A temperature measuring portion determining means for determining a temperature measuring portion of a living body by determining an incident direction of infrared light by contacting the living body with an optical field of view of an infrared detecting means at an arbitrary point on a reflecting surface. Is provided outside a three-dimensional figure drawn by a set of half-lines obtained by extending a line segment connecting the point included in the first focal point to the first focal point side, and the infrared detecting means is located at the second focal point. The infrared thermometer according to claim 2, wherein the infrared thermometer is configured to detect the emitted infrared light. 4. A half straight line obtained by extending a line segment connecting a point included in the optical field of view of the infrared detecting means and a first focal point among arbitrary points on the reflecting surface to the first focal point side. 4. The infrared thermometer according to claim 3, further comprising: a temperature-measuring portion determining means provided so that the temperature-measuring portion of the living body is located inside the three-dimensional figure drawn by the set. 5. An infrared thermometer according to claim 4, further comprising means for determining a temperature measurement site such that the temperature measurement site of the living body is located at the first focal point. 6. The infrared thermometer according to claim 5, wherein the whole or a part of the temperature measuring part determining means is formed of a transparent member, and the temperature measuring part of the living body can be visually recognized through the temperature measuring part determining means. . 7. The infrared thermometer according to claim 5, wherein a through-hole is provided in the temperature-measuring portion determining means, and the temperature-measuring portion of the living body can be visually recognized through the through hole. 8. A temperature measurement device such that a temperature measurement site of a living body is located on a line segment connecting a point included in an optical field of view of an infrared detection means and a first focus among arbitrary points on a reflection surface. The infrared thermometer according to claim 4, further comprising a site determining means. 9. A half line obtained by extending a line segment connecting a point included in the optical field of view of the infrared detecting means and a first focal point among arbitrary points on the reflecting surface to the first focal point side. 5. The infrared thermometer according to claim 4, further comprising: a temperature-measuring portion determining means for locating the temperature-measuring portion of the living body at a portion other than a line connecting the point on the reflection surface and the first focal point. 10. A first focus, which is closer to the temperature-measured part of the living body determined by the temperature-measured-part determining means, is defined as a first focus, and a focus farther from the temperature-measured part is defined as the first focus. 5. An infrared thermometer according to claim 4, wherein said thermometer is a second focus. 11. The infrared thermometer according to claim 4, wherein the second focal point is located off the center line of the temperature measuring portion determining means. 12. A half line obtained by extending a line segment connecting a point included in the optical field of view of the infrared detecting means and a first focal point among arbitrary points on the reflecting surface to the first focal point side. 5. The infrared thermometer according to claim 4, wherein an infrared detecting means is arranged outside a three-dimensional figure drawn by the set. 13. An infrared thermometer according to claim 4, wherein said infrared detecting means is configured to receive infrared light at the second focal point. 14. The infrared thermometer according to claim 4, further comprising light guiding means for guiding the infrared light focused at the second focus to the infrared detecting means. 15. A visual field restricting means for restricting an optical visual field of the infrared detecting means to a range where the reflection surface exists.
Infrared thermometer as described. 16. The infrared thermometer according to claim 4, wherein the temperature measurement site determination means is configured to determine the temperature measurement site near the eardrum of the living body by contact with the ear canal. 17. The infrared thermometer according to claim 16, further comprising voice notification means for notifying the body temperature calculated by the body temperature calculation means by voice. 18. The infrared thermometer according to claim 16, further comprising a maximum body temperature detecting means for measuring the body temperature of the living body a plurality of times and notifying a maximum value among the individual body temperatures obtained by the plurality of measurements. 19. An infrared thermometer according to claim 16, wherein a plurality of temperature measurement site determining means are replaceable. 20. The infrared thermometer according to claim 19, wherein a plurality of temperature measurement site determining means having different appearances are replaceable. 21. The infrared thermometer according to claim 20, wherein a plurality of temperature measurement site determining means having different materials are replaceable. 22. The infrared thermometer according to claim 20, wherein a plurality of temperature measuring site determining means having different shapes are replaceable. 23. The infrared thermometer according to claim 22, wherein a plurality of temperature measurement site determination means having different lengths to be inserted into the ear canal are interchangeable. 24. The infrared thermometer according to claim 22, wherein a plurality of temperature measurement site determination means having different diameters of portions inserted into the ear canal are replaceable.