JP2000217786A - Radiation clinical thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect only radiated light passed through a probe on a spot and to accurately detect temperature by positioning the opening part of a casing by separating it from the focus position of a light convergence element to a rear part and limiting a light reception area. SOLUTION: A light reception part 9 receives only infrared rays passed through the opening of the probe 1 and outputs electric signals corresponding to the infrared ray amount. A signal processing means 4 performs conversion into temperature based on the signals inputted from the light reception part 9. In this case, the converted temperature is the irradiation source temperature of the infrared rays and is equivalent to the temperature of the eardrum and/or the vicinity. The temperature converted in the signal processing means 4 is reported to a user as a body temperature in a reporting means 10. The reporting means 10 is composed of a liquid crystal display part 11 for displaying the body temperature converted in the signal processing means 4 by a numeral and a speaker 12. In this case, since the light reception part 9 receives only the infrared rays passed through the opening of the probe 1, the influence of the temperature fluctuation of the probe 1 is not received, a waveguide is not required and the temperature is accurately detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation thermometer for measuring the body temperature of a living body by detecting the amount of infrared rays emitted from the ear canal.

[0002]

2. Description of the Related Art Conventionally, as a thermometer, there has been a radiation thermometer which detects the amount of infrared rays emitted from an ear canal in a non-contact manner and converts it into a body temperature. It has the feature of being measurable with.

A general example of this type of radiation thermometer disclosed in Japanese Patent Laid-Open Publication No. 6-165 will be described with reference to FIG. As shown in FIG. 11, the radiation thermometer is a probe 1
A waveguide 2 running in the probe 1 in the length direction, an infrared light receiving element 3 for converting the radiation intensity of infrared light propagated in the waveguide 2 into an electric signal, and a temperature based on the converted electric signal. A signal processing unit 4 for measuring is provided.

[0004] By inserting the probe 1 into the ear canal, the infrared light receiving element 3 receives infrared light emitted from the eardrum and / or its vicinity, and outputs an electric signal correlated with the amount of received infrared light. The processing means 4 converts the temperature of the eardrum and / or its vicinity from the electric signal.

Generally, the infrared light receiving element 3 outputs an electric signal correlated with the total amount of infrared light incident from all directions, and at least the inner surface of the waveguide 2 is made of metal or plated. To increase the reflectivity. In such a configuration, infrared rays emitted from the eardrum and / or its vicinity reach the infrared light receiving element 3 directly or by multiple reflection on the inner surface of the waveguide 2. Unnecessary infrared light emitted from the inner surface of the probe 1 does not reach the infrared light receiving element 3.

However, it is difficult to make the inner surface of the waveguide 2 a perfect reflector (reflectance = 1), and light incident by multiple reflection causes reflection loss due to the n-th power of the reflectance. In addition, reflection at a shallow angle such as one-time reflection generally has lower reflectance than vertical light, and also causes reflection loss. The portion corresponding to these reflection losses is that the infrared radiation emitted from the waveguide 2 is incident on the infrared light receiving element 3, and if the temperature of the waveguide 2 fluctuates when the probe 1 is inserted into the ear canal, the portion is red. The external light receiving element 3 cannot be accurately measured due to the influence.

In the above-mentioned conventional example, in order to solve this problem, the tip portion of the probe 1 is made thinner than the base portion to reduce the contact with the ear canal, thereby reducing the temperature fluctuation of the waveguide 2. In the example disclosed in JP-A-5-45229, the surface of the probe is made of a heat insulating material and the inside is made of a material having a high thermal conductivity so that the probe is hardly affected by heat from the ear canal. The device is designed to cancel the influence by conducting heat to the element. Also, JP-A-8-12661
In the example disclosed in Japanese Patent Application Publication No. 5 (1999) -2005, the probe is made detachable, and the probe is replaced every time measurement is performed so as to eliminate the influence of heat accumulated in the probe.

[0008]

However, in order to accurately measure the temperature of the eardrum and / or the vicinity thereof by eliminating the influence of heat transmitted from the ear canal to the waveguide, none of the above methods is perfect. There is a problem that the accuracy of the body temperature measurement is lacked due to the influence of the temperature fluctuation of the waveguide. Particularly, when the measurement is repeatedly performed at short time intervals, the temperature of the waveguide gradually changes, and there is a problem that the measurement temperature gradually changes even in the same subject due to the influence of the temperature.

If a metal is used as a highly heat-conductive material for the waveguide in order to reduce the influence of the measurement error due to this problem, there is a problem that dew condensation easily occurs inside the waveguide in a low-temperature environment. The reason is that the temperature of the metal surface does not easily rise even if it comes into contact with air near body temperature by inserting it into the ear canal in a low temperature environment. Therefore, steam containing water vapor is cooled by the metal having a dew point or less, and dew condensation occurs on the metal surface. When this dew phenomenon occurs in a component having a function of reflecting infrared light, such as a waveguide, infrared light is absorbed and scattered by dew condensation, and infrared light reaching the infrared light receiving element is significantly reduced.
A measurement error results.

[0010] When an unspecified number of people use such a radiation thermometer, it is generally necessary to attach a sanitary cover to the probe, insert it into the ear canal, replace the sanitary cover, and dispose of the sanitary cover in terms of hygiene management. It is a target. In this sanitary cover, the portion that comes into contact with the probe tip must be closed with a membrane. This is because the tip of the waveguide extends to the tip of the probe, and it is necessary to provide a film at the tip in order to prevent contamination of the waveguide.

On the other hand, if the number of subjects is a specified small number, such as at home or in a small workplace, infection from the ear can be prevented by deciding the probe to be used for each individual. Resource consumption can be eliminated. However, even in this case, it is necessary to close the tip of the probe with a film of an infrared transmitting material in order to prevent contamination of the waveguide.

In any case, due to hygiene problems, the amount of infrared light transmitted through the film provided at the tip of the probe is measured. Here, when infrared rays pass through the film, there are components that are absorbed or reflected, and it is difficult to completely transmit the infrared rays.
The transmittance of infrared light by this film varies depending on the thickness of the film, etc., and even if it is adjusted with a specific film attached, a temperature error due to the variation in transmittance occurs when another film is attached. There is.

[0013] In addition, by notifying the measured temperature by voice, there is an effect that the measurement result can be understood even in the case of a person who is visually impaired or when measuring in the dark. For example, JP-A-6-142061 Are known.

However, for example, if the end of the measurement is reported by a beep sound, 0.1 to 0.2 seconds is sufficient, but if the temperature is reported by voice, it takes 2 to 3 seconds. That is, when sound is notified by the radiation thermometer having the above-described configuration, the probe must be continuously inserted into the ear until the notification is completed, and during that time, heat of the ear is transmitted to the waveguide, causing a temperature change. The measurement may be performed only once, but in the case of repeated measurement, there is a problem that a temperature change of the waveguide during the notification time appears as a measurement error in the next measurement.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a probe which is inserted into an ear canal and allows infrared rays emitted from the eardrum and / or its vicinity to pass therethrough, and receives infrared rays passing through the probe. A light receiving unit, a signal processing unit for calculating an output of the light receiving unit to a temperature, and a notifying unit for notifying an output of the signal processing unit, wherein the light receiving unit includes an infrared light receiving element, and the infrared light receiving element. A housing having an opening provided therein for receiving infrared light, and a light-collecting element that collects at least infrared light that has passed through the probe,
The opening of the housing is arranged to be located rearward from the focal position of the light-collecting element so as to limit the light receiving area.

According to the invention, the light receiving section is provided with the eardrum and / or the eardrum.
Alternatively, only the infrared rays radiated from the vicinity thereof and passed through the probe are received, the signal processing means calculates the output from the light receiving section to the temperature, and the notifying means notifies the temperature of the calculation result. The infrared light condensed by the light condensing element is incident on the opening of the housing of the light receiving unit, and the infrared light incident on the opening is radiated from the eardrum and / or its vicinity by being incident on the infrared light receiving element. Only the emitted light that has passed through the probe can be detected as a spot, and accurate temperature measurement can be performed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A radiation thermometer according to a first aspect of the present invention is a probe that is inserted into an ear canal and allows infrared light emitted from the eardrum and / or its vicinity to pass therethrough, and a light receiving device that receives the infrared light passing through the probe. A signal processing means for calculating an output of the light receiving section into a temperature, and a notifying means for notifying an output of the signal processing means, wherein the light receiving section includes an infrared light receiving element and the infrared light receiving element. A housing having an opening through which infrared light is incident, and a light-collecting element that collects at least infrared light that has passed through the probe, and the opening of the housing is separated from the focal position of the light-collecting element by the rear. By installing, the light receiving area is limited.

The light receiving section receives only infrared rays emitted from the eardrum and / or the vicinity thereof and passing through the probe, and the signal processing means calculates an output from the light receiving section as a temperature,
The notifying unit notifies the temperature of the calculation result. The infrared light condensed by the light condensing element is incident on the opening of the housing of the light receiving unit, and the infrared light incident on the opening is radiated from the eardrum and / or its vicinity by being incident on the infrared light receiving element. Only the emitted light that has passed through the probe can be detected as a spot, and accurate temperature measurement can be performed.

A radiation thermometer according to a second aspect of the present invention comprises:
The probe has a main body for accommodating a light receiving section, and the probe is detachably connected to the main body with the inside thereof being hollow.

The light receiving section accommodated in the main body receives only infrared rays emitted from the eardrum and / or its vicinity and passed through the probe, and the probe is detached from the main body in a hollow state without a waveguide inside. Since they are connected, there is no deterioration in temperature accuracy due to temperature fluctuations in the waveguide, there is no hygiene problem due to probe replacement, and if the probe is removed, there is no protruding portion and storage is easy.

A radiation thermometer according to a third aspect of the present invention comprises:
The probe has a configuration in which the tip is open.

Since the tip of the probe is open, the temperature error caused by the variation in the infrared transmittance of the cover that covers the tip is eliminated, and the measurement temperature accuracy can be improved.

A radiation thermometer according to a fourth aspect of the present invention comprises:
The main body has a storage section for storing the probe when measurement is not performed.

When the probe is not measured, the probe is stored in the storage portion, so that the main body has a shape that can be easily stored, and the possibility of losing the removed probe is reduced.

A radiation thermometer according to a fifth aspect of the present invention comprises:
The probe has a configuration in which a plurality of probes each have a difference that can be visually identified.

Since a plurality of probes that can be visually discriminated are provided, it is possible to specify a user for each probe, and there is no problem of infection due to probe replacement.

[0027] The radiation thermometer according to claim 6 of the present invention comprises:
The notifying means has a sound notifying means for notifying the temperature of the calculation result of the signal processing means by sound.

Then, the temperature calculated based on the output from the light receiving section that receives only infrared rays directly emitted from the eardrum and / or its vicinity is reported by the reporting means having the voice reporting means. Accurate body temperature can be measured regardless of time.

[0029] The radiation thermometer according to claim 7 of the present invention comprises:
The light receiving section has a light blocking member for blocking infrared rays from outside the light collecting element from entering the opening of the housing, and is provided with reflection suppressing means on the opening side of the housing of the light blocking body.

A light-shielding body for blocking infrared rays from outside the light-collecting element from entering the housing; and a reflection suppressing means provided on the housing side of the light-shielding body, so that the light-shielding body can be moved to a position other than the opening of the housing. There is no possibility that the advanced infrared rays are reflected and enter the inside of the housing. Therefore, the light receiving area is limited, and infrared rays from portions other than the eardrum and / or its vicinity are guided to points other than the opening of the housing, so that accurate body temperature measurement can be performed without being affected by a change in the temperature of the probe.

[0031] The radiation thermometer according to claim 8 of the present invention comprises:
A synthetic resin is used as the material of the light shielding body.

In general, the emissivity of the synthetic resin is 0.9.
It is known that the value becomes higher before and after, and reflection of infrared rays is suppressed by using this as a light shield. Also,
Synthetic resin has low thermal conductivity and small heat capacity,
Dew condensation hardly occurs on the light-shielding body surface. Therefore, accurate body temperature measurement can be performed without reflection or scattering of infrared rays due to dew condensation.

A radiation thermometer according to a ninth aspect of the present invention comprises:
The light-condensing element is made of a material having a low heat conductivity and a small heat capacity.

Further, a waveguide for blocking infrared rays from the probe is not required, and the optical system including the light collecting element does not need to have high thermal conductivity. And the light collecting element has low thermal conductivity,
In addition, since it is made of a material having a small heat capacity, dew condensation hardly occurs on the surface of the light-collecting element, and accurate body temperature measurement can be performed.

The radiation thermometer according to claim 10 of the present invention uses a synthetic resin as the material of the light-collecting element.

It is generally known that a synthetic resin has a low thermal conductivity and a small heat capacity, and it is possible to suppress dew condensation on the light-collecting element surface by the synthetic resin.

In the radiation thermometer according to the eleventh aspect of the present invention, the opening of the housing is in contact with the inner wall of the probe on the same side as the edge of the light-collecting element with respect to the optical axis from the edge of the light-collecting element. An image of the virtual tip point by the light-collecting element passing through the edge of the light-collecting element on the same side as the virtual tip point with respect to the optical axis from a virtual tip point where the drawn straight line intersects the surface of the tip of the probe. It is installed in a region farther from the light-collecting element than the intersection of the optical path reaching the point and the optical axis, and closer to the light-collecting element than the image point of the virtual tip point by the light-collecting element.

Then, the infrared light condensed by the light-collecting element enters the housing, and the opening of the housing passes through the edge of the light-collecting element on the same side as the virtual tip point, and the light is condensed by the light-collecting element. The probe inner wall is installed in a region farther from the light-collecting element than the intersection of the optical path and the optical axis reaching the image point of the virtual tip point and closer to the light-collecting element than the image point of the virtual tip point by the light collecting element. Infrared rays incident on the light-collecting element from the light source can travel to positions other than the opening of the housing, and the light receiving area can be limited. Then, since the infrared light incident from the opening of the housing is incident on the infrared light receiving element, only the radiated light emitted from the eardrum and / or its vicinity and passed through the probe can be spot-detected.

In the radiation thermometer according to a twelfth aspect of the present invention, the opening of the housing is in contact with the inner wall of the probe on the same side as the edge of the light-collecting element with respect to the optical axis from the edge of the light-collecting element. An image of the virtual tip point by the light-collecting element passing through the edge of the light-collecting element on the same side as the virtual tip point with respect to the optical axis from a virtual tip point where the drawn straight line intersects the surface of the tip of the probe. It is installed in a triangle in the meridional plane of the light-collecting element formed by the intersection of the optical path reaching the point and the optical axis and two image points of the virtual tip point by the light-collecting element. .

Then, the infrared light condensed by the light condensing element is incident on the housing, and the opening of the housing passes through the edge of the light condensing element on the same side as the virtual tip point, and the virtual light generated by the light condensing element. By setting it in a triangle in the meridional plane of the light-collecting element formed by the intersection of the optical path and the optical axis reaching the image point of the point and the two image points of the virtual point by the light-collecting element In addition, the infrared light incident on the light-collecting element from the inner wall of the probe can be advanced to a position other than the opening of the housing, and the light receiving area can be limited. Then, since the infrared light incident from the opening of the housing is incident on the infrared light receiving element, only the radiated light emitted from the eardrum and / or its vicinity and passed through the probe can be spot-detected.

According to a thirteenth aspect of the present invention, in the radiation thermometer according to the present invention, light is transmitted from the opening of the housing to the focal length f of the light collecting element, the radius rS of the opening of the housing, and the edge of the light collecting element. The distance rα between a virtual tip point and an optical axis where a straight line drawn so as to contact the inner wall of the probe on the same side as the edge of the light-collecting element with respect to the axis, and the virtual tip point The distance Lα from the light-collecting element and the radius r3 of the light-collecting element
Using,

[0042]

(Equation 3)

The light source is set farther from the light-collecting element than the focal point of the light-collecting element by L3 given by

Then, the infrared light condensed by the light-collecting element enters the housing, and the opening of the housing has a focal length f of the light-collecting element, a radius rS of the opening of the housing, and a virtual tip. A distance rα between the point and the optical axis, a distance Lα between the virtual tip point and the light-collecting element,
Using the radius r3 of the light-collecting element, L given by the above equation
By setting the distance 3 away from the focal point of the light-collecting element, the infrared light entering the light-collecting element from the inner wall of the probe can travel to positions other than the opening of the housing, limiting the light-receiving area. can do. Then, since the infrared light incident on the opening of the housing is incident on the infrared light receiving element, it is possible to spot-detect only radiated light emitted from the eardrum and / or its vicinity and passed through the probe.

According to a fourteenth aspect of the present invention, in the radiation thermometer, the opening of the housing is in contact with the inner wall of the probe on the same side as the edge of the light-collecting element with respect to the optical axis from the edge of the light-collecting element. The virtual straight line is located in a region farther from the light-collecting element than an image point formed by the light-collecting element at a virtual tip point where the drawn straight line intersects the surface of the probe tip.

The infrared light condensed by the light-collecting element is incident on the housing, and the opening of the housing is positioned on the same side as the edge of the light-collecting element with respect to the optical axis from the edge of the light-collecting element. A straight line drawn so as to be in contact with the inner wall of the probe is located farther from the light-collecting element than an image point formed by the light-collecting element at a virtual tip point that intersects the surface of the tip of the probe. Infrared rays incident on the optical element can be made to travel to positions other than the opening of the housing, and the light receiving area can be limited. Then, since the infrared light incident on the opening of the housing is incident on the infrared light receiving element, it is possible to spot-detect only radiated light emitted from the eardrum and / or its vicinity and passed through the probe.

In the radiation thermometer according to the fifteenth aspect of the present invention, the opening of the housing is in contact with the inner wall of the probe on the same side as the edge of the light-collecting element with respect to the optical axis from the edge of the light-collecting element. The drawn straight line passes through the edge of the light-collecting element opposite to the virtual tip point across the optical axis from a virtual tip point that intersects the tip surface of the probe, and It is installed in a region between two optical paths in the meridional plane of the light condensing element reaching the image point.

Then, the infrared light condensed by the light-collecting element is incident on the housing, and the opening of the housing is placed on the same side as the edge of the light-collecting element with respect to the optical axis from the edge of the light-collecting element. A straight line drawn so as to be in contact with the inner wall of the probe passes through an edge of the light-collecting element opposite to the virtual tip point across the optical axis from a virtual tip point intersecting the surface of the probe tip. By installing in a region sandwiched between two optical paths in the meridional plane of the light condensing element reaching the image point of the virtual tip point by an optical element,
Infrared light entering the light-collecting element from the inner wall of the probe can be made to travel to a position other than the opening of the housing, and the light receiving area can be limited. Then, since the infrared light incident on the opening of the housing is incident on the infrared light receiving element, it is possible to spot-detect only radiated light emitted from the eardrum and / or its vicinity and passed through the probe.

In the radiation thermometer according to a sixteenth aspect of the present invention, the opening of the housing is formed such that the focal length f of the light-collecting element, the radius rS of the opening of the housing, and the light from the edge of the light-collecting element. A distance rα between an optical axis and a virtual tip point where a straight line drawn so as to be in contact with the inner wall of the probe on the same side as the edge of the light condensing element with respect to the axis, and the virtual tip Using a distance Lα between a point and the light-collecting element and a radius r3 of the light-collecting element,

[0050]

(Equation 4)

The light source is disposed farther from the light-collecting element than the focal point of the light-collecting element by L3 represented by

Then, the infrared light condensed by the light-collecting element enters the housing, and the opening of the housing has a focal length f of the light-collecting element, a radius rS of the opening of the housing, and a virtual tip. The distance rα between the point and the optical axis, and the distance Lα between the virtual tip point and the light-collecting element
By using the radius r3 of the light-collecting element and installing the light-emitting element farther from the light-collecting element than the focal point of the light-collecting element by L3 represented by the above equation, the infrared rays incident on the light-collecting element from the inner wall of the probe Can be advanced to a position other than the opening of the housing, and the light receiving area can be limited. Then, since the infrared light that has entered the opening of the housing enters the infrared light receiving element,
Only the radiation emitted from the eardrum and / or its vicinity and passed through the probe can be detected in a spot manner.

In the radiation thermometer according to a seventeenth aspect of the present invention, the light-collecting element is constituted by a refractive lens.

Then, the condensed infrared rays enter the opening of the housing by the refraction lens.

In the radiation thermometer according to claim 18 of the present invention, the light-collecting element is constituted by a light-collecting mirror.

Then, the condensed infrared rays enter the opening of the housing by the condensing mirror.

In a radiant thermometer according to a nineteenth aspect of the present invention, the condenser mirror has a first optical axis incident on the condenser mirror and a first optical axis exiting from the condenser mirror and incident on an opening of the housing. The second optical axis is bent.

When the probe and the main body are bent in consideration of usability as a radiation thermometer which is inserted into the ear canal and measured, the optical system can be bent in accordance with this angle. Therefore, the device is easy to use and can be easily inserted into the ear canal, so that the insertion direction is stable and the body temperature can be accurately measured.

In the radiation thermometer according to a twentieth aspect of the present invention, at least the inner surface of the housing is made of a material having a high reflectance.

When the inner surface of the housing is made of a material having a high reflectance, the infrared light receiving element can be effectively made incident on the infrared light receiving element while reflecting the infrared light coming from the opening of the housing.

In the radiation thermometer according to claim 21 of the present invention, the housing is made of metal.

Since metals generally have high reflectance,
The housing can be easily configured.

[0063]

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 1 is a configuration diagram of the radiation thermometer of the present invention. 2 and 3 are side views of a plurality of probes, and FIG. 4 is a configuration diagram of a light receiving unit and a probe.

In FIG. 1, reference numeral 1 denotes a probe which is inserted into the external auditory canal at the time of measuring the body temperature and has a shape which is thinner in the direction toward the eardrum toward the eardrum, has an open end, and has a body 5 at the opposite end. The projection 6 is provided so as to be detachable. When the probe 1 is attached to the main body 5, the protrusion 6 is distorted inward by the pressing force and is attached to the main body 5. When removing, hold down probe 1 with your finger,
Similarly, the protrusion 6 is distorted inward and removed. The main body 5 has a storage section 7. When the body temperature is not measured, the probe 1 is removed and stored in the storage section 7. The storage section 7 has a lid 8 and opens and closes when stored. By removing the probe 1 at the time of non-measurement, the shape of the main body itself is obtained, and the shape becomes easy to store.
Further, since the removed probe 1 is stored in the storage unit 7, there is little possibility of the probe 1 being lost.

Reference numeral 9 denotes a light receiving section that receives only infrared light that has passed through the opening of the probe 1 and outputs an electric signal corresponding to the amount of the infrared light. Reference numeral 4 denotes a signal processing means for performing temperature conversion based on a signal input from the light receiving unit 9. The temperature converted here is the temperature of the irradiation source of infrared rays, and corresponds to the temperature of the eardrum and / or its vicinity.

The temperature converted by the signal processing means 4 is notified to the user by the notifying means 10 as the body temperature. The notifying means 10 includes a number displaying means 11 for displaying the body temperature converted by the signal processing means 4 by numbers and a voice notifying means 12. The number display means 11 is, for example, a liquid crystal display, and the audio notification means 12 is, for example, a speaker.

Here, the light receiving section 9 receives only infrared rays passing through the opening of the probe 1 as described later in detail, so that it is not affected by the temperature fluctuation of the probe 1 and does not require a waveguide. The probe 1 is detachable and includes a plurality of probes, each of which is printed with a different symbol, for example, as shown in FIG. In FIG. 2, (A) shows "A",
Symbols “B” are printed on (b), “C” on (c), and “D” on (d). For example, when using at home,
In the case of a family of four, if the probe to be used is determined for each individual, the sign can be used as a mark and mistakes can be made, and infection from the ear can be avoided. Further, since there is no waveguide, the tip of the probe 1 may be open, and the probe 1 is not covered with the film, so that there is no temperature error due to the variation in the infrared transmittance of the film.

As a method of providing a visually identifiable difference so as not to confuse the probe used for each individual, in addition to the above-described difference in symbol, a color may be changed or a different design may be printed. Further, the dimensions may be changed as shown in FIG. FIG.
(A) is the shortest, and is lengthened in the order of (b), (c), and (d). In this case, besides making sure that the probe to be used is correct due to the difference that can be visually judged, the size that is most easily inserted into the ear by using (a) for an infant with small ears and (d) for an adult with large ears There is also the effect that you can choose.

Further, since the sound is notified by the sound notifying means 12, the result of the temperature measurement can be known even when the measurement is performed in the dark or when a person who is blind has a measurement. Further, since the number display means 11 also provides notification, the temperature measurement result can be known even when measurement is performed in a noisy environment or when a person with hearing impairment performs measurement. Since the temperature is measured with the ear, the voice notifying means 12 can notify the subject at a sufficiently low volume, and only the subject can hear the temperature measurement result, and can not hear the temperature measurement result except for the subject. Don't bother with unnecessary noise. In addition, the privacy of the subject can be protected.

The configuration of the light receiving section 9 will be described with reference to FIG. In FIG. 4, reference numeral 13 denotes a refracting lens which is a condensing element, and 3 denotes an infrared light receiving element, which is built in a housing 14 made of a metal having a high reflectivity. Is provided. Reference numeral 16 denotes a light shielding body. Light shield 1
Numeral 6 designates at least an inner surface of the anti-reflection means having a low reflectance such as a synthetic resin described later in detail. A and A 'are intersections of a straight line drawn from the edge of the refracting lens 13 so as to be in contact with the inner wall of the probe 1 on the same side as the edge, and the opening from the opening as shown in FIG. If the probe is a straight line up to this point, it is located on the inner wall of the tip of the probe 1. B is a point on the inner wall of the probe 1, that is, a point in an area where light is not desired to be received, F is a focal point of the refractive lens 13, FA is an image point of A by the refractive lens 13, FA 'is an image point of A' by the refractive lens 13, FB is a refractive lens 13
Is the image point of B, K1A is the optical path of the light (marginal ray) traveling from A to the FA through the edge of the refractive lens 13 on the same side with respect to the optical axis, and K2A travels from A in parallel with the optical axis. The optical path of light passing through the focal point F and arriving at the FA, K3A is the optical path of light passing from the center of the refracting lens 13 to A and arriving at the FA, and K4A is the refracting lens 13 at the opposite side of the optical axis from A. Is an optical path of light (marginal ray) that reaches the FA through the edge of. Similarly, K1A 'passes from the edge of the refractive lens 13 on the same side with respect to the optical axis from A', and F1A '
Optical path of light (marginal ray) traveling to A ', K2A'
Travels from A 'in parallel with the optical axis, passes through the focal point F, and FA'
K3A 'is the refracting lens 1 from A'
K4, the optical path of light reaching FA 'through the center of 3
A ′ is an optical path of light (marginal ray) passing through the edge of the refractive lens 13 on the opposite side of A ′ from the A ′ and reaching FA ′, and K3B is passing through the center of the refractive lens 13 from B and FB. Is the optical path of the light reaching the optical path, FX is the optical path K1A and the optical path K1
It is the intersection of A '.

An optical system is designed so that only infrared rays passing through the opening of the probe 1 enter the opening 15 of the housing 14.

The housing 14 is attached to the light shield 16 so that the housing 14 does not receive infrared light that does not pass through the refractive lens 13. The following design is performed after a configuration is adopted in which only infrared light that has passed through the refractive lens 13 is received.

The light radiated from A is divided into light paths K1A and K2.
A reaches the image point FA of A through A, K3A, K4A, and the like. As is well known in geometrical optics, the image point FA of A is formed on the opposite side of A with respect to the optical axis. As shown in FIG. 4, the light passing through the optical path K2A passes through the refractive lens 13, crosses the optical axis at F, and reaches the FA away from the optical axis. Similarly, the light passing through the optical path K1A passes through the refractive lens 13, crosses the optical axis, and reaches the FA while leaving the optical axis. The light passing through the optical path K3A crosses the optical axis by the refraction lens 13 and then reaches the FA away from the optical axis. Light passing through the optical path K4A crosses the optical axis and passes through the refraction lens 13, and after passing through the refraction lens 13, reaches the FA without crossing the optical axis. As described above, there is a region where the light radiated from A does not pass at a position farther from the refractive lens 13 than the point FX where the optical path K1A and the optical axis intersect and closer to the refractive lens 13 than FA. This area is F
It is inside the triangle formed by X, FA and FA '. By arranging the opening 15 of the housing 14 inside this triangle, the light radiated from A and A ′ does not enter the inside of the housing 14 and the light receiving unit that is not received by the infrared light receiving element 3 can get.

It is well known that point B in the region of the inner wall of the probe 1 where light is not desired to be received is farther from the optical axis than A, so that the image point FB of B by the refraction lens 13 is farther from the optical axis than FA. is there. Therefore, by setting the opening 15 of the housing 14 inside the triangle formed by the FX, FA, and FA 'so that the infrared rays radiated from A and A' do not enter the inside of the housing 14, The infrared light from B is not automatically incident, and the infrared light receiving element 3 does not receive the light.

As described above, by placing the opening 15 of the housing 14 inside the triangle formed by the FX, FA, and FA ′, the light passes through the area to receive light near the optical axis, that is, the opening of the probe 1. A light receiving section is obtained in which the infrared light receiving element 3 receives only infrared light emitted from the eardrum and / or its vicinity.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 5 is a configuration diagram showing a light receiving unit and a probe of a radiation thermometer according to Embodiment 2 of the present invention.
In FIG. 5, reference numeral 13 denotes a refractive lens, and 3 denotes an infrared light receiving element. The infrared light receiving element is built in a housing 14 made of a metal having a high reflectivity. The housing 14 has an opening 15 through which infrared light enters. . Reference numeral 16 denotes a light shielding body. A and A 'are intersections of a straight line drawn from the edge of the refracting lens 13 so as to be in contact with the inner wall of the probe 1 and the surface of the tip of the probe 1, and as shown in FIG. This is a point located on the inner wall of the tip of the probe 1 if the probe is a suitable probe. B is a point on the inner wall of the probe 1, that is, a point in a region where light is not desired to be received, F is a focal point of the refractive lens 13, FA is a refractive lens
A ′, A ′ is an image point of A ′ by the refraction lens 13, FB is an image point of B by the refraction lens 13, K1A passes from A to the edge of the refraction lens 13 on the same side with respect to the optical axis. Path of light (marginal ray) traveling to FA through
A is an optical path of light that travels from A in parallel with the optical axis and passes through the focal point F to reach FA, K3A is an optical path of light that passes from A to the FA through the center of the refractive lens 13, and K4A is an optical path of A. After passing through the edge of the refractive lens 13 on the opposite side with respect to the optical axis, F
K1A 'is an optical path of light (marginal ray) reaching A, and an optical path of light (marginal ray) traveling from A' to FA 'through the edge of the refractive lens 13 on the same side with respect to the optical axis.
K2A 'is an optical path of light that travels from A' in parallel with the optical axis and passes through the focal point F to reach FA ', and K3A' is a light path of light that reaches FA 'through the center of the refractive lens 13 from A'. An optical path, K4A 'is an optical path of light (marginal ray) which reaches FA' through an edge of the refraction lens 13 on the opposite side of the optical axis from A ', and K3B passes a center of the refraction lens 13 from B. K4B is an optical path of light (marginal ray) passing through the edge of the refraction lens 13 on the opposite side of the optical axis from B, and FX is an optical path K1.
The intersection of A and the optical path K1A ', FY is the optical path K4A and the optical path K4.
It is the intersection of A '.

An optical system is designed such that only infrared rays passing through the opening of the probe 1 enter the opening 15 of the housing 14. The housing 14 is attached to the light shield 16 and the refractive lens 13
Infrared rays that do not pass through are not received by the housing 14. The following design is performed after a configuration is adopted in which only infrared light that has passed through the refractive lens 13 is received.

The light radiated from A is divided into optical paths K1A and K2.
A reaches the image point FA of A through A, K3A, K4A, and the like. As is well known in geometrical optics, the image point FA of A is formed on the opposite side of A with respect to the optical axis. As shown in FIG. 5, the light passing through the optical path K2A passes through the refractive lens 13, crosses the optical axis at F, reaches the FA, and moves away from the optical axis. Similarly, light passing through the optical path K1A passes through the refractive lens 13, crosses the optical axis, reaches the FA, and moves away from the optical axis. The light passing through the optical path K3A crosses the optical axis by the refractive lens 13 and
It reaches A and moves away from the optical axis. The light passing through the optical path K4A crosses the optical axis and passes through the refraction lens 13, and after passing through the refraction lens 13, reaches the FA without crossing the optical axis, and then approaches or moves away from the optical axis. Go.

As described above, there is an area where the light emitted from A does not pass at a position farther from the refracting lens than the image point FA of A. This area is more refracting lens 13 than FA.
The optical path K4A is farther from the optical path K4A ′ and the optical path K4A ′ is farther from the refraction lens 13 than the FA ′. By providing the opening 15 of the housing 14 in this region, a light receiving portion that does not receive light emitted from A and A ′ into the housing 14 and does not receive light by the infrared light receiving element 3 is obtained. .

It is well known that point B in the area of the inner wall of the probe 1 where light is not desired to be received is farther from the optical axis than A, so that the image point FB of B by the refracting lens 13 is farther from the optical axis than FA. is there. Therefore, the optical path K4A in a portion farther from the refraction lens 13 than the FA and the refraction lens 1
By setting the opening 15 of the housing 14 in a region sandwiched between the optical paths K4A 'far from 3 so that infrared rays emitted from A and A' do not enter the inside of the housing 14, The infrared light from B is not automatically incident, and the infrared light receiving element 3 does not receive the light.

As described above, the refractive lens 13 is better than the FA lens.
By setting the opening 15 of the housing 14 in a region between the optical path K4A farther from the optical path K4A ′ and the part farther from the refracting lens 13 than the FA ′, an area near the optical axis where light is to be received, That is, a light receiving section is obtained in which the infrared light receiving element 3 receives only infrared light radiated from the eardrum and / or its vicinity passing through the opening of the probe 1.

(Embodiment 3) Next, Embodiment 3 of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 6 is a configuration diagram illustrating a light receiving unit and a probe of a radiation thermometer according to Embodiment 3 of the present invention.
Here, the probe 1 differs from the above-described embodiment in that it has a rounded portion so that it can be more easily inserted into the ear canal. In FIG. 6, reference numeral 13 denotes a refractive lens, and reference numeral 3 denotes an infrared light receiving element. The infrared light receiving element is built in a housing 14 made of a metal having a high reflectivity. The housing 14 has an opening 15 through which infrared light enters. . Reference numeral 16 denotes a light shielding body. α, α ′ are virtual tip points at which a straight line contacting the edge of the refractive lens 13 and the inner wall of the probe 1 on the same side with respect to this edge and the optical axis intersects the tip face of the probe 1;
F is the focal point of the refraction lens 13, Fα and Fα ′ are the image points of α and α ′ by the refraction lens 13, respectively, and K1α is Fα passing from the edge of the refraction lens 13 on the same side with respect to the optical axis from α.
K2α is an optical path of light (marginal ray) traveling parallel to the optical axis from α and passing through the focal point F to reach Fα. K3α is an optical path from α passing through the center of the refractive lens 13 and Fα. K4α is the optical path of light (marginal ray) that passes through the edge of the refractive lens 13 on the opposite side of the optical axis from α and reaches Fα, and K1α ′ is the optical path from α ′ to the optical axis. Through the edge of the refractive lens 13 on the same side
Optical path of light (marginal ray) traveling to α ', K2α'
Proceeds from α ′ in parallel with the optical axis, passes through the focal point F, and Fα ′
, K3α ′ is the refraction lens 1 from α ′
K4, the optical path of light reaching Fα ′ through the center of K3
α ′ is an optical path of light (marginal ray) that passes through the edge of the refractive lens 13 on the opposite side of α ′ and reaches Fα ′, and FX is an intersection between the optical path K1α and the optical axis.

An optical system is designed such that only infrared rays passing through the opening of the probe 1 enter the opening 15 of the housing 14.

The housing 14 is attached to the light shielding body 16 so that the housing 14 does not receive infrared light that does not pass through the refractive lens 13. The following design is performed after a configuration is adopted in which only infrared light that has passed through the refractive lens 13 is received.

In order for only infrared light emitted from the eardrum and / or its vicinity to pass through the opening of the probe 1 to enter the opening 15 of the housing 14, infrared light radiated from the probe 1 must be What is necessary is just to stop receiving light. Therefore, a point located at the boundary between the region to receive light and the region not to receive light is imagined, and from this point, the light passes through the edge of the refractive lens 13 on the same side as the point located at the virtual boundary with respect to the optical axis. The probe 1 may be installed so as to be located farther from the optical axis than the optical path of the light (marginal ray). Therefore, the point located on the virtual boundary is referred to as the refractive lens 13.
Points α and α ′ where a straight line that contacts the inner wall of the probe 1 on the same side as the optical axis from this edge intersects the tip surface of the probe 1
The opening 15 of the housing 14 is set inside a triangle formed by Fα, Fα ′, and FX. As a result, the probe 1 moves the optical paths K1α and K1 between α and the refraction lens 13.
Because it will be located farther from the optical axis than α ',
An optical system that does not receive light from the probe 1 is obtained.

The above is described in detail below. The light emitted from α reaches the image point Fα of α through the optical paths K1α, K2α, K3α, K4α and the like. As is well known in geometrical optics, the image point Fα of α is formed on the opposite side of α with respect to the optical axis. As shown in FIG. 6, the light passing through the optical path K2α passes through the refractive lens 13, crosses the optical axis at F, and reaches Fα while leaving the optical axis. Similarly, the optical path K1α
Passes through the refractive lens 13 and crosses the optical axis, and then reaches Fα while leaving the optical axis. The light passing through the optical path K3α crosses the optical axis by the refraction lens 13 and then reaches Fα while leaving the optical axis. The light passing through the optical path K4α is
Crossing the optical axis and passing through the refractive lens 13, the refractive lens 1
After passing through No. 3, the light reaches Fα without crossing the optical axis.
As described above, there is a region where light emitted from α does not pass at a position farther from the refractive lens 13 than the point FX where the optical path K1α intersects the optical axis and closer to the refractive lens 13 than Fα. Similarly, for α ′, the optical path K
At a position farther from the refraction lens 13 than the point where the optical axis intersects with 1α 'and closer to the refraction lens 13 than Fα', there is a region through which light emitted from α 'does not pass. By installing the opening 15 of the housing 14 from the inside of the triangle formed by Fα, Fα ′, FX, α,
A light receiving section is obtained in which the infrared light receiving element 3 does not receive the light radiated from α ′. Optical path K1α between α and refractive lens 13
Light from a portion farther from the optical axis is replaced with light from a point at a distance from the optical axis larger than α in the same plane as α. It is well known in geometrical optics that the image point at this point by the refraction lens 13 is farther from the optical axis than Fα. Therefore, if light from α is not received, light from a point farther from the optical axis than α will not be received, and therefore no light from probe 1 will be received. Similarly, α ′ and refractive lens 1
The light from a portion farther from the optical axis than the optical path K1α ′ between 3 is replaced with light from a point whose distance from the optical axis is larger than α ′ in the same plane as α ′. Refraction lens 13 at this point
Is farther from the optical axis than Fα ′, as is well known in geometrical optics. Therefore, if light from α ′ is not received, light from a point farther from the optical axis than α ′ will not be received, and therefore no light from probe 1 will be received.

As described above, by arranging the opening 15 of the housing 14 inside the triangle formed by Fα, Fα ′ and FX so that the infrared rays radiated from α and α ′ do not enter, Infrared light automatically emitted from the probe 1 does not enter the inside of the housing 14 and the infrared light receiving element 3 does not receive light.

Hereinafter, the position of the opening 15 of the housing 14 that does not receive the light from α will be determined.

The opening 15 is closer to the refractive lens 13 than Fα. At this time, the following equation is established.

LαF ≧ f + L3 (1) Therefore, L3 ≦ LαF−f (2) where LαF is an image point Fα of α from the center of the refractive lens 13.
, F is the distance from the center of the refractive lens 13 to the focal point F, and L3 is the distance from the focal point F to the opening 15.

As shown in FIG. 6, since the light receiving surface is between the points FX and Fα where the optical path intersects the optical path K1α, α to F
K1α is the light path closest to the opening 15 on the light receiving surface among the optical paths up to α. Therefore, in order for the light from α not to enter the opening 15, it is necessary to satisfy the following expression.

RαS1> rS (3) where rαS1 is the distance from the intersection FαS1 between the optical path K1α and the light receiving surface of the aperture 15 to the optical axis, and rS is the aperture 15
Is the radius of Assuming that the radius of the refraction lens 13 is r3 and the distance from the optical axis to the image point Fα is rαF, r3, rαF, rαS1, L3, and f satisfy (Equation 4) as a geometric relationship, as is well known in geometrical optics.

[0093]

(Equation 5)

Therefore, (Equation 5) is satisfied.

[0095]

(Equation 6)

By substituting (Equation 5) into (Equation 3), (Equation 6) is obtained.

[0097]

(Equation 7)

From (Equation 2) and (Equation 6), the condition for preventing the light radiated from α from entering through the opening 15 is (Equation 7)
Becomes

[0099]

(Equation 8)

Further, the distance from α to the optical axis is rα, and the distance from the tip of the probe 1 to the center of the refractive lens 13 is L.
Assuming α, rα, Lα,
rαF and LαF satisfy (Equation 8) as a geometric relationship.

[0101]

(Equation 9)

Therefore, (Equation 9) is satisfied.

[0103]

(Equation 10)

By substituting (Equation 9) into (Equation 7), the condition for preventing the light radiated from α from entering through the opening 15 is (Equation 10).

[0105]

[Equation 11]

(Equation 11) holds from Gauss's formula.

[0107]

(Equation 12)

Therefore, (Equation 12) holds.

[0109]

(Equation 13)

By substituting (Equation 12) into (Equation 10), the condition for preventing the light radiated from α from entering through the opening 15 is (Equation 13).

[0111]

[Equation 14]

As described above, in order that the light radiated from α at the tip of the probe 1 does not enter the inside of the housing 14 through the opening 15 and is not received by the infrared light receiving element 3, (Equation 7) or It is necessary to design the optical system to satisfy (Equation 10) or (Equation 13). (Equation 7), (Equation 10), (Equation 1)
The aperture 15 is refracted by the refractive lens 1 by L3 given in 3).
3, the infrared rays radiated from the probe 1 do not enter from the opening 15, and only the infrared rays emitted from the eardrum and / or its vicinity and passed through the opening of the probe 1 are transmitted from the opening 15. The light can enter and be received by the infrared light receiving element 3.

(Embodiment 4) Next, Embodiment 4 of the present invention will be described with reference to FIG.
It will be described based on. FIG. 7 is a configuration diagram illustrating a light receiving unit and a probe of a radiation thermometer according to Embodiment 4 of the present invention. In FIG. 7, 1 is a probe and R is the same as in the third embodiment.
It has an attached part. 13 is a refractive lens, 3
Is an infrared light receiving element, which is built in a housing 14 made of a metal having a high reflectivity, and the housing 14 is provided with an opening 15 through which infrared rays are incident. Reference numeral 16 denotes a light shielding body. α,
α ′ is an imaginary tip point where a straight line that contacts the inner wall of the probe 1 on the same side as the edge and the optical axis from the edge of the refractive lens 13 intersects the distal end surface of the probe 1,
α and Fα ′ are image points of α and α ′ by the refraction lens 13, respectively, and K1α is an optical path of light (marginal ray) traveling from α to Fα through the edge of the refraction lens 13 on the same side with respect to the optical axis. , K2α travels from α in parallel with the optical axis to
, K3α is the optical path of the light from α to Fα through the center of the refraction lens 13, and K4α is the refraction lens 1 on the opposite side of α from the optical axis.
Light passing through the edge of No. 3 and reaching Fα (marginal ray)
K1α ′ is an optical path of light (marginal ray) traveling from α ′ to Fα ′ through the edge of the refractive lens 13 on the same side with respect to the optical axis, and K2α ′ is parallel to the optical axis from α ′. The optical path of the light that travels through the focal point F and reaches Fα ′, K3
α ′ passes through the center of the refractive lens 13 from α ′ and Fα ′
K4α ′ is an optical path of light (marginal ray) that passes through the edge of the refraction lens 13 on the opposite side of α ′ from the α ′ and reaches Fα ′, and FX is an optical path K1α and an optical axis. Is the intersection with

An optical system is designed such that only infrared rays passing through the opening of the probe 1 enter the opening 15 of the housing 14.

The housing 14 is attached to the light shield 16 so that the housing 14 does not receive infrared rays that do not pass through the refractive lens 13. The following design is performed after a configuration is adopted in which only infrared light that has passed through the refractive lens 13 is received.

In order to receive only infrared light emitted from the eardrum and / or the vicinity thereof and passing through the opening of the probe 1, infrared light emitted from the probe 1 need not be received. Therefore, a point located at the boundary between the area where light is desired to be received and the area where light is not desired is imagined, and from this point,
The probe 1 is located farther from the optical axis than the optical path of the light (marginal ray) passing through the edge of the refractive lens 13 on the same side as the point located at the virtual boundary with respect to the optical axis.
Should be installed. Therefore, the points located on the virtual boundary are defined as points α and α ′ where a straight line that contacts the inner wall of the probe 1 on the same side as the edge and the optical axis from the edge of the refractive lens 13 intersects the distal end surface of the probe 1. Refraction lens 1 than Fα
The infrared light receiving element 3 is disposed in a region between the optical path K4α far from the optical path K4α and the optical path K4α ′ farther from the refracting lens 13 than Fα ′. As a result, the probe 1 is set to α
And the refractive lens 13, the optical path is located farther from the optical axis than the optical paths K 1 α and K 1 α ′, so that an optical system that does not receive light from the probe 1 is obtained.

The details will be described below.

Light radiated from α has optical paths K1α, K2
It reaches the image point Fα of α through α, K3α, K4α and the like. As is well known in geometrical optics, the image point Fα of α is formed on the opposite side of α with respect to the optical axis. As shown in FIG. 7, light passing through the optical path K2α passes through the refractive lens 13, crosses the optical axis at F, reaches Fα, and moves away from the optical axis. Similarly, light passing through the optical path K1α passes through the refractive lens 13, crosses the optical axis, reaches Fα, and moves away from the optical axis. The light passing through the optical path K3α crosses the optical axis by the refraction lens 13 and
It reaches α and moves away from the optical axis. The light passing through the optical path K4α crosses the optical axis and passes through the refraction lens 13, and after passing through the refraction lens 13, reaches Fα without crossing the optical axis and thereafter approaches or moves away from the optical axis. Go. As described above, there is a region where light emitted from α does not pass at a position further from the refraction lens 13 than the image point Fα of α. Similarly, for α ′, there is a region where the light radiated from α ′ does not pass at a position farther from the refractive lens 13 than the image point Fα ′ of α ′. By setting the opening 15 in a region sandwiched between the optical path K4α at a portion farther from the refraction lens 13 than Fα and the portion of the optical path K4α ′ farther from the refraction lens 13 than Fα ′, α A light receiving portion that does not receive the emitted infrared light is obtained. α
Light from a portion farther from the optical axis than the optical path K1α between the lens and the refraction lens 13 is replaced with light from a point whose distance from the optical axis is larger than α in the same plane as α. It is well known in geometrical optics that the image point at this point by the refraction lens 13 is farther from the optical axis than Fα. Therefore, if light from α is prevented from entering the opening 15, light from a point farther from the optical axis than α does not enter, and therefore, light from the probe 1 does not enter from the opening 15. Similarly, light from a portion farther from the optical axis than the optical path K1α 'between α' and the refractive lens 13 is replaced with light from a point whose distance from the optical axis is larger than α 'in the same plane as α'. . It is well known in geometrical optics that the image point at this point by the refraction lens 13 is farther from the optical axis than Fα ′. Therefore, if light from α ′ is prevented from entering the opening 15, light from a point farther from the optical axis than α ′ does not enter, and therefore the probe 1
Does not enter through the opening 15.

As described above, the optical path K4α at a portion farther from the refraction lens 13 than Fα and the refraction lens 1
If the infrared rays radiated from α and α ′ are prevented from being incident by installing the opening 15 in a region interposed between the optical paths K4α ′ far from 3 and the infrared rays radiated from the probe 1 are automatically The infrared light receiving element 3 does not receive light and does not receive light.

Hereinafter, the position of the opening 15 that does not receive the light from α will be determined.

The opening 15 is farther from the refractive lens 13 than Fα. At this time, the following equation is established.

LαF ≦ f + L3 (14) Therefore, L3 ≧ LαF−f (15) where LαF is the image point Fα of α from the center of the refractive lens 13.
, F is the distance from the center of the refractive lens 13 to the focal point F, and L3 is the distance from the focal point F to the opening 15.

As shown in FIG. 7, since the light receiving surface is farther from the refracting lens 13 than Fα, K4α is the light receiving surface closest to the opening 15 in each of the optical paths from α to Fα. Therefore, in order for the light from α not to enter the opening 15, it is necessary to satisfy the following expression.

RαS4> rS (16) where rαS4 is the distance from the intersection FαS4 between the optical path K4α and the light receiving surface of the aperture 15 to the optical axis, and rS is the aperture 15
Is the radius of Assuming that the radius of the refractive lens 13 is r3 and the distance from the optical axis to the image point Fα is rαF, r3, rαF, LαF, rαS4, L3,
f satisfies (Equation 17) as a geometric relationship.

[0125]

(Equation 15)

Therefore, (Equation 18) is satisfied.

[0127]

(Equation 16)

(Equation 19) is obtained by substituting (Equation 18) into (Equation 16).

[0129]

[Equation 17]

From (Equation 15) and (Equation 19), the condition for preventing the light radiated from α from entering the opening 15 is (Equation 2)
0).

[0131]

(Equation 18)

Further, the distance from α to the optical axis is rα, and the distance from the tip of the probe 1 to the center of the refractive lens 13 is L.
Assuming α, rα, Lα,
rαF and LαF satisfy the above (formula 8) as a geometric relationship. Therefore, the above (Equation 9) is satisfied.

By substituting (Equation 9) into (Equation 20), the condition for preventing the light radiated from α from entering the opening 15 is (Equation 21).

[0134]

[Equation 19]

The above equation (Equation 1) is based on Gauss's formula.
1) holds. Therefore, the above (Equation 12) holds.

By substituting (Equation 12) into (Equation 21), the condition for not receiving the light radiated from α by the infrared light receiving element 3 becomes (Equation 22).

[0137]

(Equation 20)

As described above, in order that the light radiated from α does not enter the aperture 15, the optical system is designed so as to satisfy the condition of (Equation 20), (Equation 21), or (Equation 22). There is a need to. (Equation 20), (Equation 21), (Equation 2)
The opening 15 is changed to the refractive lens 1 by L3 given by 2).
3, the infrared ray emitted from the probe 1 does not enter the housing 14 through the opening 15 and is not received by the infrared light receiving element 3 and is placed in the eardrum and / or its vicinity. Only the infrared rays emitted from the probe 1 and passing through the opening of the probe 1 can enter through the opening 15 and be received by the infrared light receiving element 3. Therefore, a waveguide that blocks infrared rays from the probe 1 becomes unnecessary. Also, since there is no waveguide that receives heat from the probe 1, the refractive lens 13
It is not necessary to use a material having high thermal conductivity.

In the first to fourth embodiments, the refractive lens 13 is made of a synthetic resin such as polyethylene which transmits infrared rays having a wavelength of about 10 μm. The thermal properties of polyethylene are such that the thermal conductivity λ is 0.34 J / msK and the heat capacity is 2.12 × 10 ⁶ J / kgK. For reference, when the physical properties of a metal body, for example, copper, are described, the thermal conductivity λ is 398 J / msK, and the heat capacity is 3.43 × 10 ⁶ J /.
kgK, which indicates that the thermal conductivity of the synthetic resin is small and the heat capacity is small.

At this time, when the radiation thermometer which has been left in the low temperature room is brought into the high temperature room, the low temperature refractive lens 1
A state in which the light receiving unit 9 including 3 cools the surrounding air to be below the dew point occurs transiently.

However, since the refractive lens 13 has a small heat capacity, the surface temperature tends to rise, and since the thermal conductivity is small, the heat on the surface does not diffuse in the thickness direction. Therefore, even if the surface of the refractive lens 13 becomes lower than the dew point, the time is short, and dew condensation hardly occurs. Therefore, even when the temperature around the radiation thermometer changes, accurate temperature detection without the influence of dew condensation is possible.

In the above, an example in which a refraction lens is used as the light-collecting element of the light-receiving section has been described. Even when a transmission-type diffractive lens is used, the eardrum and / or
Alternatively, only infrared rays emitted from the vicinity thereof and passing through the opening of the probe 1 can enter the housing 14 from the opening 15 and be received by the infrared light receiving element 3, and have an effect that the lens can be easily formed.

(Embodiment 5) Next, Embodiment 5 of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 8 is a configuration diagram illustrating a light receiving unit and a probe of a radiation thermometer according to Embodiment 5 of the present invention.
Here, the condensing element 13 uses a converging mirror unlike the above embodiment. In FIG. 8, reference numeral 1 denotes a probe, 3 denotes an infrared light receiving element, and a housing 1 made of a metal having a high reflectance.
4, the housing 1 has an opening 1 through which infrared rays are incident.
5 are provided. Reference numeral 16 denotes a light shielding body. α, α ′ are virtual tip points at which a straight line that contacts the inner wall of the probe 1 on the same side as the edge and the optical axis from the edge of the focusing mirror 13 intersects the tip face of the probe 1, F is the focal point of the focusing mirror 13, Fα, F
α ′ is an image point of α and α ′ by the condenser mirror 13, respectively.
K1α is an optical path of light (marginal ray) which is reflected from the edge of the condenser mirror 13 on the same side with respect to the optical axis and travels to Fα, and K2α travels from α in parallel with the optical axis and passes through the focal point F. K3α is an optical path of light reaching Fα, and K3α is an optical path of light reaching Fα after being reflected at the center of the condensing mirror 13 from α.
Is the optical path of light (marginal ray) reflected from the edge of the condenser mirror 13 on the opposite side of the optical axis from α and reaching Fα, K
1α ′ is a condenser mirror 13 on the same side of the optical axis as α ′.
Reflected at the edge of the light and traveling to Fα '(marginal ray)
K2α ′ travels in parallel with the optical axis from α ′ to focus F
, K3α 'is α'.
K4α ′ is a light path that reflects from the center of the condensing mirror 13 and reaches Fα ′, and K4α ′ is light that reflects from α ′ at the edge of the condensing mirror 13 on the opposite side of the optical axis and reaches Fα ′. The optical path FX of the (marginal ray) is the intersection of the optical path K1α and the optical axis.

An optical system is designed such that only infrared rays passing through the opening of the probe 1 enter the opening 15 of the housing 14.

The housing 14 is provided inside the light shielding body 16 so that the housing 14 does not receive infrared light which is not reflected by the condenser mirror 13. The following design is performed after the configuration is such that only infrared rays reflected by the condenser mirror are received.

In order to receive only infrared light emitted from the eardrum and / or the vicinity thereof and passing through the opening of the probe 1, infrared light emitted from the probe 1 may not be received. Therefore, a point located at the boundary between the area where light is desired to be received and the area where light is not desired is imagined, and from this point,
The probe 1 is positioned so as to be located farther from the optical axis than the optical path of the light (marginal ray) reflected by the edge of the condensing mirror 13 on the same side as the point located at the virtual boundary with respect to the optical axis.
Should be installed. Therefore, the points located on the virtual boundary are defined as points α and α ′ where a straight line contacting the edge of the condenser mirror 13 and the inner wall of the probe 1 on the same side with respect to this edge and the optical axis intersects the distal end surface of the probe 1. , Fα, Fα ′, and FX, the opening 15 is provided inside the triangle. As a result, the probe 1 moves the optical path K1 between α and the condenser mirror 13.
Since it is located farther from the optical axis than α and K1α ′, an optical system that does not receive light from the probe 1 can be obtained.

The above is described in detail below. The light emitted from α reaches the image point Fα of α through the optical paths K1α, K2α, K3α, K4α and the like. As is well known in geometrical optics, the image point Fα of α is formed on the opposite side of α with respect to the optical axis. As shown in FIG. 8, the light passing through the optical path K2α is reflected by the condenser mirror 13, crosses the optical axis at F, and reaches Fα while leaving the optical axis. Similarly, the optical path K1α
Passes through the light collecting mirror 13, crosses the optical axis, and reaches Fα while leaving the optical axis. The light passing through the optical path K3α crosses the optical axis by the condenser mirror 13 and then reaches Fα while moving away from the optical axis. The light passing through the optical path K4α is
The light is reflected by the condenser mirror 13 crossing the optical axis, and
After being reflected at 3, the light reaches Fα without crossing the optical axis.
As described above, there is a region where the light emitted from α does not pass at a position farther from the condenser mirror 13 than the point FX where the optical path K1α intersects with the optical axis and closer to the condenser mirror 13 than Fα. . Similarly, for α ′, the optical path K
There is an area where light emitted from α ′ does not pass at a position further from the light collecting mirror 13 than at the point where the optical axis intersects with 1α ′ and closer to the light collecting mirror 13 than Fα ′. By installing the opening 15 inside the triangle formed by Fα, Fα ′, and FX, a light receiving unit that does not receive light emitted from α and α ′ can be obtained.

Light from a portion farther from the optical axis than the optical path K1α between α and the condenser mirror 13 is replaced with light from a point whose distance from the optical axis is larger than α in the same plane as α. It is well known in geometrical optics that the image point at this point by the condenser mirror 13 is farther from the optical axis than Fα. Therefore, if light from α is not received, light from a point farther from the optical axis than α will not be received, and therefore no light from probe 1 will be received. Similarly, light from a portion farther from the optical axis than the optical path K1α ′ between α ′ and the focusing mirror 13 is:
It is replaced with light from a point whose distance from the optical axis is larger than α ′ in the same plane as α ′. It is well known in geometrical optics that the image point of this point by the condenser mirror 13 is farther from the optical axis than Fα ′. Therefore, if light from α ′ is not received, light from a point farther from the optical axis than α ′ will not be received, and therefore no light from probe 1 will be received.

Thus, by setting the opening 15 inside the triangle formed by Fα, Fα ′ and FX, α,
If the infrared rays radiated from α ′ are prevented from entering the opening 15, the infrared rays radiated from the probe 1 do not automatically enter the housing 14 from the opening 15, and the infrared light receiving element 3
In this case, no light is received.

Hereinafter, the position of the opening 15 that does not receive the light from α will be determined.

The opening 15 is closer to the condenser mirror 13 than Fα. At this time, (Equation 1) holds, and accordingly (Equation 2) holds. Here, LαF is the distance from the center of the condenser mirror 13 to the image point Fα of α, f is the distance from the center of the condenser mirror 13 to the focal point F, and L3 is the distance from the focal point F to the opening 15.
Is the distance to

As shown in FIG. 8, the light receiving surface is between the points FX and Fα where the optical path K1α and the optical axis intersect.
K1α is the light path closest to the opening 15 on the light receiving surface among the optical paths up to α. Therefore, in order for the light from α not to enter the opening 15, it is necessary to satisfy (Equation 3). Here, rαS1 is the distance from the intersection FαS1 between the optical path K1α and the light receiving surface of the opening 15 to the optical axis, and rS is the radius of the opening 15. The radius of the condensing mirror 13 is r3,
Assuming that the distance from the optical axis to the image point Fα is rαF, r3, rαF, rαS1, L3, and f satisfy (Equation 4) as a geometric relationship as is well known in geometrical optics, and therefore (Equation 5)
Meet. By substituting (Equation 5) into (Equation 3), (Equation 6) is obtained. From (Equation 2) and (Equation 6), the condition that the light emitted from α does not enter the opening 15 is (Equation 7).

Further, the distance from α to the optical axis is rα, and the distance from the tip of the probe 1 to the center of the condenser mirror 13 is L.
Assuming α, rα, Lα,
rαF and LαF satisfy (Expression 8) as a geometric relationship, and therefore satisfy (Expression 9). By substituting (Equation 9) into (Equation 7), the condition for preventing the light emitted from α from entering the opening 15 is (Equation 10). Also, (Equation 11) holds from Gauss's formula, and thus (Equation 12) holds. By substituting (Equation 12) into (Equation 10), the condition for preventing the light radiated from α from entering the opening 15 is (Equation 13).

As described above, in order for the light radiated from α at the tip of the probe 1 not to enter the opening 15, the optical system must satisfy (Equation 7), (Equation 10), or (Equation 13). Need to be designed. (Equation 7), (Equation 1)
0) and L3 given by (Equation 13), the aperture 15 is displaced from the focal point of the condenser mirror 10 so that the infrared radiation emitted from the probe 1 does not enter the aperture 15 and Only infrared rays emitted from the vicinity thereof and passing through the opening of the probe 1 are transmitted from the opening 15 to the housing 1.
4 and can be received by the infrared light receiving element 3.

(Embodiment 6) Next, Embodiment 6 of the present invention will be described with reference to FIG.
It will be described based on. FIG. 9 is a configuration diagram illustrating a light receiving unit and a probe of a radiation thermometer according to Embodiment 6 of the present invention. In FIG. 9, 1 is a probe, 13 is a condenser mirror,
Reference numeral 3 denotes an infrared light receiving element, which is built in a housing 14 made of a metal having a high reflectance, and the housing 14 is provided with an opening 15 through which infrared rays are incident. Reference numeral 16 denotes a light shielding body.
α, α ′ are virtual tip points at which a straight line that contacts the inner wall of the probe 1 on the same side as the edge and the optical axis from the edge of the focusing mirror 13 intersects the tip face of the probe 1, F is the focal point of the focusing mirror 13, Fα and Fα ′ are respectively α,
The image point of α ′, K1α is the optical path of light (marginal ray) that travels from α to the edge of the condenser mirror 13 on the same side with respect to the optical axis and travels to Fα, and K2α travels from α in parallel with the optical axis. , K3α is an optical path of light reflected from the center of the condensing mirror 13 to reach Fα, and K4α is a light path of the opposite side from α with respect to the optical axis. The optical path of light (marginal ray) K1α ′ that is reflected by the edge of the optical mirror 13 and reaches Fα proceeds from α ′ through the edge of the light collecting mirror 13 on the same side with respect to the optical axis to Fα ′. An optical path of light (marginal ray), K2α ′ is an optical path of light that travels from α ′ in parallel with the optical axis, passes through the focal point F, and reaches Fα ′;
K3α ′ is reflected from α ′ at the center of the condenser mirror 13 and F3
K4α ′ is an optical path of light reaching α ′, K4α ′ is an optical path of light (marginal ray) which is reflected by an edge of the condenser mirror 13 on the opposite side of the optical axis and reaches Fα ′, and FX is an optical path K1α.
And the optical axis.

An optical system is designed such that only infrared rays passing through the opening of the probe 1 enter the opening 15.

The housing 14 is provided inside the light shield 16 so that only the infrared rays reflected by the condenser mirror 13 enter the opening 15. The following design is performed after a configuration in which only the infrared light reflected by the condenser mirror 13 is incident.

In order to receive only infrared light emitted from the eardrum and / or the vicinity thereof and passing through the opening of the probe 1, infrared light emitted from the probe 1 may be prevented from being received. Therefore, a point located at the boundary between the area where light is desired to be received and the area where light is not desired is imagined, and from this point,
The probe 1 may be installed so as to be located farther from the optical axis than the optical path of the light (marginal ray) reflected by the converging mirror 13 on the same side as the point located at the virtual boundary with respect to the optical axis. . Therefore, the points located on the virtual boundary are defined as points α and α ′ where a straight line contacting the edge of the condenser mirror 13 and the inner wall of the probe 1 on the same side with respect to this edge and the optical axis intersects the distal end surface of the probe 1. , Fα than the focusing mirror 13
The opening 15 is provided in an area sandwiched between the optical path K4α 'at a portion farther from the optical path K4α' and the optical path K4α 'at a portion farther from the focusing mirror 13 than Fα'. As a result, the probe 1 is located farther from the optical axis than the optical paths K1α and K1α ′ between α and the condenser mirror 13, so that an optical system that does not receive light from the probe 1 is obtained.

The above is described in detail below.

Light radiated from α has optical paths K1α, K2
It reaches the image point Fα of α through α, K3α, K4α and the like. As is well known in geometrical optics, the image point Fα of α is formed on the opposite side of α with respect to the optical axis. As shown in FIG. 9, the light passing through the optical path K2α is reflected by the condenser mirror 13, crosses the optical axis at F, reaches Fα, and moves away from the optical axis. Similarly, light passing through the optical path K1α is reflected by the condenser mirror 13, crosses the optical axis, reaches Fα, and moves away from the optical axis. The light passing through the optical path K3α crosses the optical axis at
It reaches α and moves away from the optical axis. The light passing through the optical path K4α crosses the optical axis and is reflected by the condensing mirror 13, and after being reflected by the condensing mirror 13, arrives at Fα without crossing the optical axis and thereafter approaches the optical axis or Go away. As described above, there is a region where light emitted from α does not pass at a position farther from the light collecting mirror 13 than the image point Fα of α. Similarly, for α ′, there is a region where light emitted from α does not pass at a position further from the light collecting mirror 13 than the image point Fα of α. By setting the infrared light receiving element 3 in an area between the optical path K4α farther from the converging mirror 13 than Fα and the optical path K4α ′ farther from the converging mirror 13 than Fα ′, α , Α ′ are not received. Light from a portion farther from the optical axis than the optical path K1α between α and the condenser mirror 13 is replaced with light from a point whose distance from the optical axis is larger than α in the same plane as α. It is well known in geometrical optics that the image point at this point by the condenser mirror 13 is farther from the optical axis than Fα. Therefore, if light from α is not received, light from a point farther from the optical axis than α will not be received, and therefore no light from probe 1 will be received. Similarly, an optical path K1α ′ between α ′ and the condenser mirror 13
Light from a portion farther from the optical axis is replaced with light from a point greater than α ′ in the same plane as α ′. It is well known in geometrical optics that the image point of this point by the condenser mirror 13 is farther from the optical axis than Fα ′. Therefore, if light from α ′ is not received, light from a point farther from the optical axis than α ′ will not be received, and therefore no light from probe 1 will be received.

As described above, the optical path K4α at a portion farther from the converging mirror 13 than Fα and the converging mirror 1
If the infrared rays radiated from α and α ′ are prevented from being incident by installing the opening 15 in a region interposed between the optical paths K4α ′ far from 3 and the infrared rays radiated from the probe 1 are automatically The infrared light receiving element 3 does not receive light from the opening 15 and does not enter the housing 14.

Hereinafter, the position of the opening 15 that does not receive the light from α will be determined.

The opening 15 is farther from the light collecting mirror 13 than Fα. At this time, (Equation 14) holds, and therefore (Equation 15) holds. Here, LαF is the focusing mirror 13
Is the distance from the center of the image to the image point Fα of α, and f is the focusing mirror 1
L3 is the distance from the center of 3 to the focal point F, and L3 is the distance from the focal point F to the opening 15.

As shown in FIG. 9, since the light receiving surface is farther from the condensing mirror 13 than Fα, of the light paths from α to Fα, the light path closest to the infrared light receiving element 3 is K4α.
It is. Therefore, in order for the light from α to not be received by the infrared light receiving element 3, it is necessary to satisfy (Equation 16). Here, rαS4 is the distance from the intersection FαS4 between the optical path K4α and the light receiving surface of the infrared light receiving element 3 to the optical axis, and rS is the aperture 1
5 radius. Assuming that the radius of the condenser mirror 13 is r3 and the distance from the optical axis to the image point Fα is rαF, r3, rαF, LαF, rαS4, L
3, f satisfies (Equation 17) as a geometric relationship, and thus satisfies (Equation 18). (Equation 19) is obtained by substituting (Equation 18) into (Equation 16). (Equation 15), (Equation 1)
According to 9), the condition for preventing the light emitted from α from entering the opening 15 is (Equation 20).

Further, the distance from α to the optical axis is rα, and the distance from the tip of the probe 1 to the center of the focusing mirror 13 is L.
Assuming α, rα, Lα,
rαF and LαF satisfy (Expression 8) as a geometric relationship, and therefore satisfy (Expression 9). By substituting (Equation 9) into (Equation 20), the condition for preventing the light emitted from α from entering the opening 15 is (Equation 21). Also, since (Equation 11) holds from the Gauss's formula, (Equation 12) holds. By substituting (Equation 12) into (Equation 21), the condition for preventing the light emitted from α from entering the opening 15 is (Equation 22).

As described above, in order that the light emitted from α does not enter the aperture 15, the optical system is designed so as to satisfy the condition of (Equation 20), (Equation 21), or (Equation 22). There is a need to. (Equation 20), (Equation 21), (Equation 2)
The aperture 15 is focused on the converging mirror 1 by L3 given in 2).
3, the infrared rays radiated from the probe 1 do not enter the opening 15, and only the infrared rays emitted from the eardrum and / or the vicinity thereof and passing through the opening of the probe 1 are transmitted to the opening 15. Can be incident.

(Embodiment 7) Next, Embodiment 7 of the present invention will be described with reference to FIG.
Explanation will be made using 0. FIG. 10 shows an example in which, in a case where a condensing mirror is used as a condensing element, a first optical axis incident on the converging mirror and a second optical axis reflected and emitted from the converging mirror are bent. Reference numeral 13 denotes a concave mirror as a light-collecting element, and the focal point is at F. By cutting out only a part of A to A 'indicated by a thick line among them and using it as a condensing mirror, the optical axis passing through the center can be bent and used as indicated by a dashed line. Here, the infrared light receiving element 3 is provided inside a housing 14 having an opening 15,
What is necessary is just to arrange it behind the focal point F of the condensing mirror 13, specifically in the range shown by the above-mentioned embodiment.

Considering the ease of use of the radiation thermometer, it is preferable to return to FIG. 1 and to bend the probe 1 and the main body 5 by about 115 degrees. It holds the body 5 by hand and the probe 1
Is inserted into the ear canal, the angle at which body temperature can be measured at a natural hand position is about 115 degrees. Therefore, FIG.
If the optical axis is bent at about 115 degrees at 0, the light receiving section can be easily stored in the main body. In addition, by measuring the body temperature at a natural hand position, the direction in which the probe is inserted into the ear canal can be easily stabilized, and the measurement accuracy of the body temperature can be improved.

In Embodiments 5 to 7, the condensing mirror 13 is used.
Unlike the refractive lenses described in the first to fourth embodiments, the material does not need to transmit infrared rays. For example, here, the condensing mirror 13 has a configuration in which polypropylene or polycarbonate is used as the material, and a metal is deposited or plated on the surface thereof. The physical properties of polypropylene were such that the thermal conductivity λ was 0.12 J / msK and the heat capacity was 1.76 × 10
⁶ J / kgK. The physical properties of the polycarbonate were such that the thermal conductivity λ was 0.19 J / msK and the heat capacity was 1.5.
1 × 10 ⁶ J / kgK, both of which are sufficiently small like the polyethylene described in the example of the refractive lens.

According to this configuration, the infrared light radiated from the probe 1 is not made incident on the housing 14 through the opening 15 but only the radiated light from the eardrum and / or its vicinity is made incident.
Since the light can be received by the infrared light receiving element 3, the light collecting element 13 is hardly affected by the heat transmitted from the object to be measured, and the optical system does not need to have high thermal conductivity. Since the light-collecting element has a small heat capacity and a low thermal conductivity, it can be configured to perform accurate temperature detection without the influence of dew condensation even when the temperature changes, as in the case of the refractive lens.

However, the material used for the light collecting mirror is not limited to polypropylene, polycarbonate, and polyethylene.

As described above, the example in which the light collecting mirror is used as the light collecting element of the light receiving section has been described. However, this has an effect of increasing the amount of received light without transmission loss as compared with the case of using a refractive lens. Also, even if a reflective diffraction lens is used, the aperture 1
By arranging 5, only infrared rays emitted from the eardrum and / or the vicinity thereof and passing through the opening of the probe 1 can be made incident on the housing 14 from the opening 15 and received by the infrared light receiving element 3, and can be mirrored. There is an effect that molding is easy.

In each of the above embodiments, the probe 1 transmitted or reflected by the light condensing element 13 and not entering the opening 15
Infrared light from the inner surface of the light-shielding body 16 is incident on the inner surface of the light shielding body 16. However, since the inner surface of the light shield 16 is a reflection suppressing means, the incident infrared rays are not reflected and enter the opening 15. Therefore, it is possible to reliably prevent infrared radiation from the probe 1 which causes a measurement error from being incident on the housing 14 from the opening 15 and being received by the infrared light receiving element 3, thereby enabling accurate temperature detection.

The light shield 16 is made of, for example, PC, PPS, PB
A synthetic resin such as T or PP is used. It is generally known that the emissivity of these synthetic resins is as high as about 0.9. Further, the infrared ray incident on the object is divided into a reflection component, an absorption component, and a transmission component, but when there is no transmission, the sum of the reflectance and the absorptivity becomes 1. Here, according to Kirchhoff's law, the emissivity and the absorptance are equal, and as a result, it can be said that a synthetic resin having a high emissivity has a low reflectance. Therefore, by forming the light shielding body 16 using these synthetic resins, the light shielding body 16 itself serves as a reflection suppressing means, and unnecessary infrared rays that have traveled to positions other than the infrared light receiving element 3 are reflected by the light shielding body 16. As a result, the light does not enter the infrared light receiving element 3. Accordingly, the effect of restricting the light receiving area and preventing unnecessary infrared rays from the probe 1 from being incident on the infrared light receiving element 3 can be completed.

Needless to say, the light shield 16 is designed using a synthetic resin having a small transmission of infrared rays and having a sufficient thickness to transmit no infrared rays. Also,
When the light shield 16 is made of a synthetic resin, dew condensation hardly occurs on the light shield 16 according to the same principle as that of the light collecting element. If the light shield 16 is made of metal, the dew condensation generated on the light shield 16 moves and adheres to the light collecting element 13, and as a result, the light collecting ability may be reduced.
The infrared light radiated from the probe 1 may be scattered by the condensation generated in the infrared ray 6 and radiated from the probe 1 to the infrared light receiving element 3 from the opening 15. There is no such thing because it does not occur.

Further, with the arrangement of the light-collecting element 13 and the opening 15 described above, it is possible to change the shape of the probe within a range where the infrared rays radiated from the probe do not reach the opening 15, and FIG. A plurality of probes having different diameters as well as the different lengths in the length direction shown may be provided. In particular, if the size in the length direction is reduced, the diameter can be reduced by the same arrangement of the light-collecting element and the infrared light-receiving element.

In each of the above embodiments, the infrared light receiving element 3 may be used as it is if it is a thermopile type whose output is correlated with the temperature difference from the object. If the pyroelectric type has a correlation with the target temperature change, a chopper for forcibly changing incident infrared rays may be provided.

In each of the above embodiments, by arranging the opening 15 of the housing 14 at an appropriate position, the infrared radiation radiated from the eardrum and / or its vicinity irrespective of the size of the infrared light receiving element 3. You can only receive light. That is, the range described in the embodiment is only a very small area, and even if the infrared light receiving element 3 is large, the infrared light receiving element 3 can be reduced by only reducing the area of the opening 15 and the eardrum and / or the eardrum. Only infrared light emitted from the vicinity can be received. Here, the housing 14 can be made to have a simple configuration by using a metal having a high reflectance. However, the material may be made of resin and the inner surface may be deposited or plated with metal. The reason for increasing the reflectance of the inner surface is to make the infrared light incident from the opening 15 incident on the infrared light receiving element 3 while being reflected on the inner surface of the housing.
This is to increase the amount of received light at When the inner surface is a black body, only the direct light incident from the opening 15 is incident on the infrared light receiving element 3, so that the sensitivity of the infrared light receiving element 3 is sufficiently large and there is no practical problem, Need not be high.

[0179]

As described above, the radiation thermometer of the present invention has the following effects.

According to the radiation thermometer according to the first aspect of the present invention, the light receiving section receives only infrared rays radiated from the eardrum and / or its vicinity and passed through the probe, and the signal processing means outputs the output from the light receiving section to the temperature. And the notifying means notifies the temperature of the calculation result. The infrared light condensed by the light condensing element is incident on the opening of the housing of the light receiving unit, and the infrared light incident on the opening is radiated from the eardrum and / or its vicinity by being incident on the infrared light receiving element. Only the emitted light that has passed through the probe can be detected as a spot, and accurate temperature measurement can be performed.

According to the radiation thermometer according to the second aspect of the present invention, the light receiving section housed in the main body receives only infrared rays emitted from the eardrum and / or its vicinity and passed through the probe, and the probe is guided inside. Since there is no tube and it is detachably connected to the main body, there is no deterioration in temperature accuracy due to temperature fluctuation of the waveguide, there is no hygiene problem by replacing the probe, and there is no protruding part if the probe is removed Storage becomes easy.

According to the radiation thermometer according to the third aspect of the present invention, since the probe has an open end, there is no temperature error caused by the variation in the infrared transmittance of the cover covering the end, and the measurement temperature accuracy can be improved. .

According to the radiation thermometer according to the fourth aspect of the present invention, since the probe is stored in the storage portion when measurement is not performed, the main body has a shape that can be easily stored, and the possibility of losing the removed probe is small. Become.

According to the radiation thermometer according to the fifth aspect of the present invention, since a plurality of probes that can be visually discriminated are provided, it is possible to specify the user for each probe and there is no problem of infection due to probe replacement. .

According to the radiation thermometer according to the sixth aspect of the present invention, the temperature is calculated based on the output from the light receiving unit that receives only infrared rays directly radiated from the eardrum and / or its vicinity. Since the notification is made by the notification means, an accurate body temperature can be measured regardless of the time of insertion into the ear.

According to the radiation thermometer according to the seventh aspect of the present invention, the radiation thermometer has a light-shielding body for blocking infrared rays from outside the light-collecting element from entering the housing, and reflection suppression means is provided on the housing side of the light-shielding body. Therefore, the infrared light that has traveled to a position other than the opening of the housing is not reflected and enters the inside of the housing. Therefore, the light receiving area is limited, and infrared rays from portions other than the eardrum and / or its vicinity are guided to points other than the opening of the housing, so that accurate body temperature measurement can be performed without being affected by a change in the temperature of the probe.

According to the radiation thermometer according to the eighth aspect of the present invention, it is generally known that the emissivity of the synthetic resin is as high as about 0.9. Reflection is suppressed. Further, since the synthetic resin has a low thermal conductivity and a small heat capacity, dew condensation hardly occurs on the light-shielding body surface. Therefore, accurate body temperature measurement can be performed without reflection or scattering of infrared rays due to dew condensation.

According to the radiation thermometer according to the ninth aspect of the present invention, a waveguide for blocking infrared rays from the probe is not required, and the optical system including the light collecting element does not need to have high thermal conductivity. Since the light-collecting element is made of a material having a low thermal conductivity and a small heat capacity, dew condensation hardly occurs on the surface of the light-collecting element, and accurate body temperature measurement can be performed. Claim 1 of the present invention
According to the radiation thermometer according to 0, it is generally known that the synthetic resin has a low thermal conductivity and a small heat capacity, and the synthetic resin can suppress dew condensation on the surface of the light-collecting element.

According to the radiation thermometer according to the eleventh aspect of the present invention, the infrared light condensed by the light condensing element is incident on the housing, and the opening of the housing has a collecting point on the same side as the virtual tip point. It is farther from the light-collecting element than the intersection of the optical path and the optical axis reaching the image point of the virtual tip point by the light-condensing element through the edge of the light element, and condensed more than the image point of the virtual tip point by the light-collecting element. By installing the infrared sensor in a region close to the element, the infrared light incident on the light-collecting element from the inner wall of the probe can travel to a position other than the opening of the housing, and the light receiving region can be limited. Then, since the infrared light incident from the opening of the housing is incident on the infrared light receiving element, regardless of the size of the infrared light receiving element, only the light emitted from the eardrum and / or its vicinity and passed through the probe is spotted. It becomes possible to detect.

According to the radiation thermometer according to the twelfth aspect of the present invention, the infrared light condensed by the light condensing element is incident on the housing, and the opening of the housing is provided on the same side as the virtual tip point. A light-collecting element formed by an intersection of an optical path and an optical axis that passes through the edge of the element and reaches an image point of a virtual tip point by the light-collecting element, and two image points of the virtual tip point by the light-collecting element The infrared ray incident on the light-collecting element from the inner wall of the probe can be advanced to a position other than the opening of the housing by setting the light-receiving element within the triangle in the meridional plane, and the light receiving area can be limited. Then, since the infrared light incident from the opening of the housing is incident on the infrared light receiving element, regardless of the size of the infrared light receiving element, only the light emitted from the eardrum and / or its vicinity and passed through the probe is spotted. It becomes possible to detect.

According to the radiation thermometer according to the thirteenth aspect of the present invention, the infrared ray condensed by the light condensing element is incident on the housing, and the opening of the housing has the focal length f of the light condensing element. The radius rS of the opening of the housing and the distance rα between the virtual tip point and the optical axis
And using the distance Lα between the virtual tip point and the light-collecting element and the radius r3 of the light-collecting element, setting the distance L3 given by (Equation 13) farther from the light-collecting element than the light-focusing element. Thus, the infrared light incident on the light-collecting element from the inner wall of the probe can be advanced to a position other than the opening of the housing, and the light receiving area can be limited. Then, since the infrared light that has entered the opening of the housing enters the infrared light receiving element, only the light emitted from the eardrum and / or its vicinity and passed through the probe is spotted regardless of the size of the infrared light receiving element. It becomes possible to detect.

According to the radiation thermometer according to the fourteenth aspect of the present invention, the infrared light condensed by the light condensing element enters the housing, and the opening of the housing is moved from the edge of the light condensing element to the optical axis. A straight line drawn so as to be in contact with the inner wall of the probe on the same side as the edge of the light-collecting element is closer than the image point by the light-collecting element at a virtual tip point that intersects the surface of the tip of the probe. By disposing the infrared ray in a far area, the infrared ray incident on the light-collecting element from the inner wall of the probe can be advanced to a position other than the opening of the housing, and the light receiving area can be limited. Then, since the infrared light that has entered the opening of the housing enters the infrared light receiving element, only the light emitted from the eardrum and / or its vicinity and passed through the probe is spotted regardless of the size of the infrared light receiving element. It becomes possible to detect.

According to the radiation thermometer according to the fifteenth aspect of the present invention, the infrared light condensed by the light condensing element enters the housing, and the opening of the housing is moved from the edge of the light condensing element to the optical axis. A straight line drawn so as to be in contact with the inner wall of the probe on the same side as the edge of the light-collecting element is located on the opposite side to the virtual tip point across the optical axis from a virtual tip point that intersects the tip surface of the probe. 2 in the meridional plane of the light-collecting element passing through the edge of the light-collecting element and reaching the image point of the virtual tip point by the light-collecting element
By installing the infrared ray in the area sandwiched between the two optical paths, the infrared ray incident on the light-collecting element from the inner wall of the probe can travel to a position other than the opening of the housing, and the light receiving area can be limited. Then, since the infrared light that has entered the opening of the housing enters the infrared light receiving element, only the light emitted from the eardrum and / or its vicinity and passed through the probe is spotted regardless of the size of the infrared light receiving element. It becomes possible to detect.

According to the radiation thermometer according to the sixteenth aspect of the present invention, the infrared ray condensed by the light condensing element is incident on the housing, and the opening of the housing has the focal length f of the light condensing element. The radius rS of the opening of the housing and the distance rα between the virtual tip point and the optical axis
Using the distance Lα between the virtual tip point and the light-collecting element and the radius r3 of the light-collecting element, the distance L3 represented by (Equation 22) is set farther from the light-collecting element than the focal point of the light-collecting element. With this arrangement, the infrared light incident on the light-collecting element from the inner wall of the probe can be advanced to a position other than the opening of the housing, and the light receiving area can be limited. Then, since the infrared light that has entered the opening of the housing enters the infrared light receiving element, only the light emitted from the eardrum and / or its vicinity and passed through the probe is spotted regardless of the size of the infrared light receiving element. It becomes possible to detect.

According to the radiation thermometer according to the seventeenth aspect of the present invention, the infrared rays collected by the refraction lens enter the opening of the housing.

According to the radiation thermometer according to the eighteenth aspect of the present invention, the collected infrared rays are incident on the opening of the housing by the light collecting mirror.

According to the radiation thermometer according to the nineteenth aspect of the present invention, when the probe and the main body are bent in consideration of usability as a radiation thermometer which is inserted into the ear canal and measured, the optical system also bends in accordance with this angle. Can be done. Therefore, the device is easy to use and can be easily inserted into the ear canal, so that the insertion direction is stable and the body temperature can be accurately measured.

According to the radiation thermometer according to the twentieth aspect of the present invention, the inner surface of the housing is made of a material having a high reflectance,
The infrared light receiving element can be effectively made incident while reflecting infrared light incident from the opening of the housing. According to the radiation thermometer according to claim 21 of the present invention, since the metal generally has a high reflectance, the housing can be simply configured.

[Brief description of the drawings]

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

FIGS. 2A to 2D are side views of a plurality of probes on which different symbols of the embodiment are printed.

3A to 3D are side views of a plurality of probes having different dimensions according to the embodiment.

FIG. 4 is a configuration diagram of a light receiving unit and a probe according to the embodiment.

FIG. 5 is a configuration diagram illustrating a light receiving unit and a probe according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram illustrating a light receiving unit and a probe according to a third embodiment of the present invention.

FIG. 7 is a configuration diagram illustrating a light receiving unit and a probe according to a fourth embodiment of the present invention.

FIG. 8 is a configuration diagram illustrating a light receiving unit and a probe according to a fifth embodiment of the present invention.

FIG. 9 is a configuration diagram illustrating a light receiving unit and a probe according to a sixth embodiment of the present invention.

FIG. 10 is a configuration diagram of a light-collecting element according to a seventh embodiment of the present invention.

FIG. 11 is a configuration block diagram of a conventional radiation thermometer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Probe 3 Infrared light receiving element 4 Signal processing means 5 Main body 7 Storage part 9 Light receiving part 10 Informing means 12 Audio informing means 13 Condensing element 14 Housing 15 Opening 16 Light shield (reflection suppression means)

 ──────────────────────────────────────────────────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 BA30 BA57 BB02 BB11

Claims (21)

[Claims] 1. A probe that is inserted into the ear canal and passes infrared light emitted from the eardrum and / or its vicinity, a light receiving unit that receives the infrared light that has passed through the probe, and a signal that calculates the output of the light receiving unit into temperature. Processing means, and a notifying means for notifying the output of the signal processing means, wherein the light receiving unit is an infrared light receiving element, a housing having an infrared light receiving element therein and an opening through which infrared light enters, At least a light-collecting element that collects infrared light that has passed through the probe,
A radiation thermometer, wherein a light receiving area is limited by disposing an opening of the housing away from a focal position of the light-collecting element. 2. The radiation thermometer according to claim 1, further comprising a main body for accommodating the light receiving section, wherein the probe is detachably connected to the main body with the inside thereof being hollow. 3. The radiation thermometer according to claim 2, wherein the probe has an open end. 4. The radiation thermometer according to claim 2, wherein the main body has a storage portion for storing a probe when measurement is not performed. 5. A probe according to claim 2, wherein said plurality of probes have a difference which can be visually identified.
The described radiation thermometer. 6. The radiation thermometer according to claim 1, wherein the notifying means has a sound notifying means for notifying the temperature of the operation result of the signal processing means by sound. 7. A light-receiving section has a light-shielding body for blocking infrared rays from outside of the light-collecting element from entering the opening of the housing, and a reflection suppressing means is provided on the light-shielding body on the opening side of the housing. The radiation thermometer according to claim 1. 8. The radiation thermometer according to claim 7, wherein a synthetic resin is used as a material of the light shield. 9. The radiation thermometer according to claim 1, wherein the light-collecting element is made of a material having a low thermal conductivity and a small heat capacity. 10. The radiation thermometer according to claim 9, wherein a synthetic resin is used as a material of the light-collecting element. 11. A straight line formed by drawing an opening of the housing from the edge of the light-collecting element so as to contact the inner wall of the probe on the same side as the edge of the light-collecting element with respect to the optical axis. Of the optical path and the optical axis from the virtual tip point intersecting with the optical axis and passing through the edge of the light-collecting element on the same side as the virtual tip point and reaching the image point of the virtual tip point by the light-collecting element The radiation thermometer according to claim 1, wherein the thermometer is installed in a region farther from the light-collecting element than an intersection and closer to the light-collecting element than an image point of the virtual tip point by the light-collecting element. 12. A straight line drawn from the edge of the light-collecting element to the inner wall of the probe on the same side as the edge of the light-collecting element with respect to the optical axis from the edge of the light-collecting element. Of the optical path and the optical axis from the virtual tip point intersecting with the optical axis and passing through the edge of the light-collecting element on the same side as the virtual tip point and reaching the image point of the virtual tip point by the light-collecting element The radiation thermometer according to claim 11, wherein the radiation thermometer is installed in a triangle formed by an intersection and two image points of the virtual tip point by the light-collecting element, in a meridional plane of the light-collecting element. 13. An opening of the housing is provided with a focal length f of the light-collecting element.
And a radius rS of the opening of the housing and a straight line drawn from the edge of the light-collecting element so as to be in contact with the inner wall of the probe on the same side as the edge of the light-collecting element with respect to the optical axis. Using the distance rα between the virtual tip point crossing the plane and the optical axis, the distance Lα between the virtual tip point and the light-collecting element, and the radius r3 of the light-collecting element, 13. The radiation thermometer according to claim 12, wherein the radiation thermometer is installed farther from the light-collecting element than the focal point of the light-collecting element by L3 given by: 14. A straight line drawn from the edge of the light-collecting element to the inner wall of the probe on the same side of the optical axis as the edge of the light-collecting element from the edge of the light-collecting element. 2. The image forming apparatus according to claim 1, wherein the virtual tip point is located in a region farther from the light-collecting element than an image point formed by the light-collecting element.
10. A radiation thermometer according to claim 10. 15. A straight line drawn from the edge of the light-collecting element so as to be in contact with the inner wall of the probe on the same side as the edge of the light-collecting element from the edge of the light-collecting element. Of the light-collecting element that passes through the edge of the light-collecting element opposite to the virtual point from the virtual point that intersects the optical axis and reaches the image point of the virtual point by the light-collecting element. The radiation thermometer according to claim 14, wherein the radiation thermometer is installed in a region between two optical paths in a meridian plane. 16. An opening in the housing is provided so that the focal length of the light-collecting element is f.
And a radius rS of the opening of the housing, and a straight line drawn from the edge of the light-collecting element so as to be in contact with the inner wall of the probe on the same side as the edge of the light-collecting element with respect to the optical axis. The distance rα between the optical axis and the virtual tip point intersecting the tip face,
Using the distance Lα between the virtual tip point and the light-collecting element and the radius r3 of the light-collecting element, The radiation thermometer according to claim 15, wherein the radiation thermometer is installed farther from the light-collecting element by a distance L3 represented by the following expression. 17. The radiation thermometer according to claim 1, wherein the light-collecting element is a refraction lens. 18. The radiation thermometer according to claim 1, wherein the light-collecting element is a light-collecting mirror. 19. A condensing mirror configured to bend a first optical axis incident on the converging mirror and a second optical axis emitted from the converging mirror and incident on an opening of a housing. The radiation thermometer according to claim 18, wherein 20. The radiation thermometer according to claim 1, wherein at least the inner surface of the housing is made of a material having a high reflectance. 21. The radiation thermometer according to claim 20, wherein the housing is made of metal.