JP4989273B2 - Cooker - Google Patents

Description

  The present invention detects a heating means for heating a cooking container placed and supported in a state positioned above the top plate, and the intensity of infrared rays emitted from the bottom of the cooking container heated by the heating means. The present invention relates to a heating cooker comprising infrared intensity detecting means for detecting and temperature detecting means for detecting the temperature of the cooking container based on detection information of the infrared intensity detecting means.

Conventionally, in what was applied to the gas stove as an example of the heating cooker, there was what was configured as follows,
A gas-burning burner is provided as the heating means, and a light transmission window made of a light-transmitting material that transmits light in the vertical direction is formed at a position corresponding to the side of the burner on the top plate. An intensity detection means is provided in a state positioned below the light transmission window, and is configured to detect the intensity of infrared rays radiated from the bottom of the cooking container and passed through the light transmission window. There is one configured to detect the temperature of the cooking container based on the intensity of the infrared rays (see, for example, Patent Document 1).

Incidentally, the reason why the infrared intensity detecting means detects the infrared radiation intensity emitted from the bottom of the cooking container is to minimize the error in the detected temperature of the cooking container.
For example, when it is configured to detect the intensity of infrared rays emitted from the vertical peripheral surface portion of the cooking container instead of the bottom of the cooking container, for example, tempura oil or the like is accommodated in the cooking container. When only a small amount of items are stored, the temperature of the cooking container may not correspond to the temperature of the stored items. On the other hand, if the intensity of infrared rays radiated from the bottom of the cooking container is detected, the temperature of the cooking container is detected in a state corresponding to the temperature of the stored object even if the amount of the stored object is small. It becomes possible to do.

JP 2006-220395 A

In the above conventional configuration, since the infrared intensity detecting means is provided at a high temperature place on the lower side of the top plate, there is a high possibility that the ambient temperature of the infrared intensity detecting means is increased.
As a result, in the above conventional configuration, the detection error when detecting the intensity of the infrared ray radiated from the bottom of the cooking container by the infrared intensity detection means is increased due to the increase in the atmospheric temperature, There was a disadvantage that the detection error when detecting the temperature of the container became large.

  An object of the present invention is to provide a heating cooker that can detect the temperature of a cooking container as accurately as possible based on the intensity of infrared rays emitted from the bottom of the cooking container.

  The heating cooker according to the present invention is radiated from the heating means for heating the cooking container placed and supported in a state of being positioned above the top plate, and the bottom of the cooking container heated by the heating means. Infrared intensity detecting means for detecting infrared intensity, and temperature detecting means for detecting the temperature of the cooking container based on detection information of the infrared intensity detecting means, the first characteristic configuration is The infrared intensity detection means is provided in a state of being located on the upper side of the top plate and spaced apart from the heating means in the horizontal direction, and detecting the infrared intensity emitted from the bottom of the cooking container. The light guide part leading to the means is provided.

  According to the first characteristic configuration, the infrared intensity radiated from the bottom of the cooking container is provided by the light guide in a state where the infrared is positioned on the upper side of the top plate and spaced apart from the heating means in the horizontal direction. The infrared intensity is detected by the infrared intensity detecting means after being guided to the detecting means. The temperature detecting means detects the temperature of the cooking container based on the detection information of the infrared intensity detecting means thus detected.

  Since the infrared intensity detecting means is provided in a state that is located above the top plate and spaced apart from the heating means in the horizontal direction, the infrared intensity detecting means is hardly affected by high temperature heat by the heating means. There is little risk of an increase in the ambient temperature of the detection means.

  Therefore, according to 1st characteristic structure, it came to be able to provide the heating cooker which can detect the temperature of a cooking container as accurately as possible based on the intensity | strength of the infrared rays radiated | emitted from the bottom part of the cooking container. .

  According to a second characteristic configuration of the present invention, in addition to the first characteristic configuration, the light guide section is provided on the top plate.

  According to the second characteristic configuration, since the light guide unit is provided on the top plate, the light guide unit can be supported using a top plate provided in a heating cooker, and other than the top plate. There is no need to support the light guide portion by a dedicated support member.

  Therefore, according to the second characteristic configuration, the light guide unit can be supported by a simple support configuration as compared with the configuration in which the light guide unit is supported by a dedicated support member other than the top plate.

  According to a third characteristic configuration of the present invention, in addition to the second characteristic configuration, the light guide unit reflects an infrared ray radiated from a bottom portion of the cooking container and guides the infrared ray intensity to the infrared intensity detecting means. It is in the point which is comprised.

  According to the third characteristic configuration, since the light guide unit is configured by an infrared reflector that reflects the infrared radiation radiated from the bottom of the cooking container and guides it to the infrared intensity detecting means, the radiation is emitted from the bottom of the cooking container. The infrared rays that have passed are emitted toward the infrared reflector through the air, reflected by the infrared reflector, and further guided through the air to the infrared intensity detecting means.

  In order to guide the infrared ray radiated from the bottom of the cooking container to the infrared intensity detecting means located at a position spaced apart from the heating means in the horizontal direction, the infrared ray can be guided using, for example, an optical fiber. There is a risk that the attenuation of the noise increases. On the other hand, the infrared intensity is reduced in a state in which the infrared ray is less attenuated by adopting a configuration in which the infrared ray is radiated from the bottom of the cooking container and passes through the air and reflected by the infrared reflector. It is possible to guide the detection means.

  Therefore, according to the third characteristic configuration, it is possible to detect the intensity of the infrared ray radiated from the bottom of the cooking container as accurately as possible by guiding the infrared ray to the infrared intensity detecting means with little attenuation.

  The fourth characteristic configuration of the present invention is that, in addition to the third characteristic configuration, the infrared reflector is provided on the upper surface side of the top plate.

  According to the fourth feature configuration, since the infrared reflector is provided on the upper surface side of the top plate, there is a possibility that the infrared reflector is contaminated with foreign matters such as boiled juice that blows from the cooking container, dust in the air, and the like. However, it can be easily removed by cleaning from the upper side of the top plate.

  Therefore, according to the fourth characteristic configuration, the surface of the infrared reflector can be easily maintained in a clean state by a simple cleaning operation.

  In the fifth feature configuration of the present invention, in addition to the third feature configuration, a window part capable of transmitting infrared light is formed on a part of the top plate, and the infrared reflector reflects infrared light transmitted through the window part. It is in the point provided in the lower surface side of the said window part with the form made to make.

  According to the fifth characteristic configuration, a window part capable of transmitting infrared light is formed on a part of the top plate, and the infrared reflector is formed on the lower surface side of the window part in a form of reflecting infrared light transmitted through the window part. Is provided.

  If comprised in this way, even if foreign materials, such as boiled juice which spills from a cooking container, may fall, the upper surface of the said window part can be easily removed by cleaning from the upper side of a top plate, and cleaning work is performed. In addition, when performing such cleaning work, it may be cleaned while rubbing with a cloth, etc., but even if such cleaning work may be repeated, the members constituting the window portion are In general, it is less likely to be rubbed and damaged by the cloth, and the infrared reflector is not likely to be damaged by the cleaning operation.

  Therefore, according to the fifth characteristic configuration, even when the cleaning operation is repeatedly performed, the reflection of the infrared rays for guiding the infrared rays radiated from the bottom of the cooking container toward the infrared intensity detecting means is in a good state over a long period of time. It will be easy to maintain.

[First Embodiment]
Hereinafter, a first embodiment of a heating cooker according to the present invention will be described based on the drawings.
FIG. 1 shows a schematic diagram of a built-in stove 100 as a cooking device according to the present invention. The stove 100 is configured to include two stove burners 101 and a grill 102, and is provided in an installation unit 104 opened in a counter 103 of the system kitchen. Further, a grill exhaust part 105 for discharging cooking exhaust generated from the grill part 102 is formed on the rear side of the stove 100.

  As shown in FIG. 2, each of the above-described stove burner units 101 has a flat top plate 1 made of a material having heat resistance, a virtues 2 on which a cooking container N such as a pan can be placed, and the virtues 2. A gas combustion burner 3 as a heating means for heating the cooking container N to be placed, a combustion control section 4 as a control means for controlling the operation of the burner 3, and a combustion control section 4 based on human operation. An operation unit 5 for instructing an ignition command, a fire extinguishing command, a heating power adjustment command, and the like to the burner 3 is provided.

  The burner 3 is a Bunsen combustion type burner, and a gas nozzle 7 for ejecting a fuel gas G supplied through a fuel supply path 6, the fuel gas G is ejected from the gas nozzle 7, and the fuel gas G is ejected. A mixing pipe 8 to which combustion air A is supplied by the accompanying suction action, and a burner main body 10 provided with a plurality of flame ports 9 for jetting the air-fuel mixture supplied from the mixing pipe 8 radially outward. The burner body 10 is exposed upward through an opening 11 formed in the top plate 1. And the air-fuel | gaseous mixture injected from the flame opening 9 is burned, the flame F is formed, and the container N for cooking is heated. The fuel supply path 6 is provided with a fuel supply intermittent valve 12 for intermittently supplying the fuel gas G to the gas nozzle 7 and a fuel supply amount adjusting valve 13 for adjusting the supply amount of the fuel gas G to the gas nozzle 7. It is done. Although not shown, an ignition igniter and a thermocouple for confirming the ignition state of the burner 3 are provided in the vicinity of the flame opening 9 of the burner 3.

  The combustion control unit 4 executes an ignition process for igniting the burner 3 when an ignition command is commanded by the operation unit 5. That is, the fuel supply intermittent valve 12 is opened, the gas supply amount in the fuel supply amount adjustment valve 13 is adjusted to the ignition supply amount, the igniter is operated to ignite the burner 3, and the thermocouple is ignited When the condition is confirmed, the igniter stops operating. Further, when a heating power adjustment command is commanded by the operation unit 5 after the burner 3 is ignited, the combustion control unit 4 changes and adjusts the gas supply amount in the fuel supply amount adjustment valve 13 based on the heating power adjustment command. And the combustion control part 4 will perform the fire extinguishing process of the burner 3, if the fire extinguishing command is commanded by the operation part 5. That is, the fuel supply intermittent valve 12 and the fuel supply amount adjustment valve 13 are closed to stop the supply of the fuel gas G, and the combustion of the burner 3 is stopped.

  And this stove is based on the infrared intensity detection part 40 as an infrared intensity detection means which detects the intensity | strength of the infrared rays radiated | emitted from the container N for cooking, and the infrared intensity detected by the infrared intensity detection part 40 A temperature detection unit 50 as temperature detection means for detecting the temperature of the cooking container N is provided. And the said infrared intensity detection part 40 is comprised so that the infrared intensity about two mutually different wavelength ranges in the infrared rays radiated | emitted from the container N for cooking may be detected, and the said temperature detection part 50 is an infrared intensity detection part. The temperature of the cooking container N is detected based on the relationship of the infrared intensity for each of the two wavelength ranges detected at 40, specifically, the ratio of the infrared intensity for each of the two wavelength ranges. It is configured. Further, the infrared intensity detection unit 40 is configured to detect infrared intensity in a wavelength range set within a range where there is no radiation from the flame of the burner 3 in the infrared wavelength range or the radiation intensity is weak. .

  And the infrared intensity detection part 40 is provided in the state located in the location which is the upper side of the top plate 1, and was spaced apart from the burner 3 in the horizontal direction, and infrared intensity detection is carried out from the bottom part of the container N for cooking. A light guide portion D leading to the portion 40 is provided.

The light guide D is constituted by a total reflection mirror 44 as an infrared reflector that reflects infrared rays radiated from the bottom of the cooking container N and guides them to the infrared intensity detection unit 40. The mirror 44 is provided on the upper surface side of the top plate 1.
More specifically, as shown in FIGS. 1 and 2, the infrared intensity detector 40 is provided on a support 45 provided in a state of protruding upward from the top plate 1 at the left and right corners on the rear side of the stove. It is provided in a state where it is supported and its infrared detection direction is obliquely downward. Further, it is a position in the vicinity of the outer peripheral side of the burner 3 on the top plate 1 and the center position of the burner 3 and each position. A total reflection mirror 44 that reflects infrared light emitted from the bottom of the cooking container N and guides it to the infrared intensity detection unit 40 is provided at a position that substantially corresponds to the line connecting the support unit 45.

  The total reflection mirror 44 is formed by vapor-depositing a metal such as aluminum on a part of the upper surface of the top plate 1 and has a wide infrared ray including a temperature detection wavelength region as described later. It is configured to be able to reflect with a high reflectance close to about 100% over the wavelength region. The infrared rays radiated from the bottom of the cooking container N are reflected by the total reflection mirror 44 and guided toward the infrared intensity detection unit 40. The infrared intensity detection unit 40 has an infrared detection direction set so as to receive infrared rays from the bottom of the cooking container N reflected by the total reflection mirror 44.

Next, the configuration of the infrared intensity detection unit 40 will be described.
As shown in FIG. 2, the infrared intensity detector 40 includes two bandpass filters 41a and 41b having different wavelength ranges of infrared rays to be transmitted, and infrared rays that have passed through the two bandpass filters 41a and 41b. Two infrared detecting elements 42a and 42b that are separately detected are configured to detect infrared intensities in two different wavelength ranges in the infrared rays emitted from the cooking container N. . The bandpass filters 41a and 41b are configured to selectively transmit only infrared rays in a predetermined wavelength region.

Next, how to set the two wavelength ranges will be described.
FIG. 3 shows the infrared radiation intensity spectrum distribution emitted from the flame formed by the actual burner 3. As is apparent from this figure, the radiation from the flame is strong in the infrared wavelength range of 2.4 μm to 3.1 μm and 4.2 μm to 8.0 μm. Therefore, it is preferable to set the detection target wavelength range in which the infrared intensity is detected by the infrared intensity detector 40 outside the wavelength range where the radiation from such a flame is strong.

  As the two infrared detecting elements 42a and 42b for detecting the infrared intensity in the wavelength region as described above, Ge or InGaAs is used as an infrared cell, PbS or PbSe is used as an infrared cell, and HgCdTe is used. Various things, such as what was used as an infrared cell, can be utilized.

Next, a process for obtaining the temperature of the cooking container N by the temperature detection unit 50 will be described. In the following description, the two wavelength regions are denoted by λ1 and λ2. Incidentally, the wavelength region λ2 is longer than the wavelength region λ1.
FIG. 4 shows the temperature of the object to be heated (cooking container N) obtained in advance by experiment and the output values (corresponding to the infrared intensity) for each of the two wavelength regions λ1 and λ2 in the infrared intensity detector 40. Show the relationship. Incidentally, the relationship shown in FIG. 4 is obtained using a cooking container having an emissivity (emissivity) of 0.92.

  FIG. 5 shows an output ratio (the aforementioned ratio) between the temperature of the object to be heated (cooking container N) and the output value corresponding to the wavelength region λ1 and the output value corresponding to the wavelength region λ2 in the infrared intensity detector 40. (Corresponding to the infrared intensity ratio) (hereinafter may be referred to as a relationship between temperature and infrared intensity ratio). Incidentally, the relationship between temperature and infrared intensity ratio shown in FIG. 5 is obtained as follows.

That is, for each of a plurality of cooking containers having different emissivities, the temperature of the cooking container is varied to a plurality of temperatures, and the output ratio is obtained for each of the plurality of temperatures. Then, based on the data obtained for a plurality of cooking containers having different emissivities ε, an approximate expression of the relationship between the temperature and the output ratio is obtained, and the obtained approximate expression is expressed as a relationship between the temperature and the infrared intensity ratio. It is said.
Therefore, the relationship between the temperature-to-infrared intensity ratios of the respective cooking containers N having different emissivities ε can be made into one common temperature-to-infrared intensity ratio relationship. Further, the relationship of the temperature to infrared intensity ratio as shown in FIG. 5 obtained as described above is stored in the storage unit (not shown) of the temperature detection unit 50.

  Then, the temperature detection unit 50 obtains and stores an output ratio (corresponding to the infrared intensity ratio) between the output value corresponding to the wavelength region λ1 and the output value corresponding to the wavelength region λ2 in the infrared intensity detection unit 40. The temperature of the cooking container N is determined from the relationship between the temperature and the infrared intensity ratio. By taking such a ratio of output values, the temperature of the cooking container N can be accurately detected without depending on the emissivity of the cooking container N.

  Information on the temperature obtained by the temperature detection unit 50 is output to the combustion control unit 4, and the combustion control unit 4, based on the temperature obtained by the temperature detection unit 50, By controlling the fuel supply amount adjusting valve 13 and the like, for example, temperature control such as maintaining the temperature of the cooking container N below a set temperature, emergency control of the burner when the cooking container N is excessively heated, etc. Configured to do.

[Second Embodiment]
Next, a second embodiment of the heating cooker according to the present invention will be described.
In the second embodiment, the configuration of the light guide is the same as the configuration of the first embodiment except that only the different configuration is described, and the description of the same configuration is omitted.

  That is, in this embodiment, as shown in FIG. 6, a window portion 46 capable of transmitting infrared rays is formed on a part of the top plate 1, and a total reflection mirror 47 as an infrared reflector is arranged so that the window portion 46 is It is provided on the lower surface side of the window portion 46 in a form that reflects transmitted infrared rays. In the total reflection mirror 47, the upper side surface, that is, the surface on the window 46 side functions as a reflection surface. Like the total reflection mirror 44 of the first embodiment, for example, a metal such as aluminum is vapor-deposited. It is formed, and can be reflected at a high reflectance close to about 100% over a wide wavelength range of infrared rays including a wavelength range for temperature detection.

When the description is added, like the arrangement position of the total reflection mirror 44 of the first embodiment, it is a position in the vicinity of the outer peripheral side of the burner 3 on the top plate 1, and the center position of the burner 3 and each support portion 45. At a position substantially corresponding to the line connecting the two, a window portion 46 made of one translucent member is formed in a part of the top plate 1 so that light is transmitted in the vertical direction. The window portion 46 is made of a translucent material different from the material constituting the top plate 1, and the translucent material includes a plurality of wavelength ranges used for temperature detection in the infrared intensity detection unit 40. For example, crystallized glass, quartz, sapphire, CaF ₂ (calcium fluoride), MgF ₂ (magnesium fluoride), ZnSe (zinc selenide), Si (silicon), Y Various materials such as ₂ O ₃ (yttrium oxide) can be used.

And the total reflection mirror 47 is provided in the lower surface side of this window part 46, The infrared rays radiated | emitted from the bottom part of the cooking container N and permeate | transmitted the said window part 46 are reflected in this total reflection mirror 47, and infrared intensity It is guided toward the detection unit 40.
Therefore, in this embodiment, the total reflection mirror 47 constitutes the light guide D that guides the infrared rays radiated from the bottom of the cooking container N to the infrared intensity detector 40.

[Third Embodiment]
Next, a third embodiment of the heating cooker according to the present invention will be described.
In the third embodiment, the configuration of the light guide is the same as the configuration of the first embodiment except that only the different configuration is described, and the description of the same configuration is omitted.

  That is, in this embodiment, as shown in FIG. 7, an optical fiber 60 is used as the light guide D, and the other end 60 a of the optical fiber 60 faces the bottom of the cooking container N and others. The end 60b is arranged facing the infrared intensity detector 40, and the infrared rays emitted from the bottom of the cooking container N are transmitted through the optical fiber 60 and guided to the infrared intensity detector 40.

  The optical fiber 60 has the one end 60a in a state of passing through the top plate 1 and is installed upward so as to introduce infrared rays radiated from the bottom of the cooking container N, and a midway portion 60c in the longitudinal direction thereof. After passing the lower side of the top plate 1, the other end portion 60 b is placed on the infrared intensity detection unit 40 provided in a state of being located on the upper side of the top plate 1 and spaced apart from the burner 3 in the horizontal direction. It is configured to be installed upward so as to guide it.

[Another embodiment]
Next, another embodiment will be described.

(1) In each of the above embodiments, the infrared intensity detection unit is provided in a state of being supported by the support unit 45 provided in a state of protruding upward from the top plate 1 at the left and right corners on the rear side of the stove. However, instead of such a configuration, as shown in FIG. 8, the exhaust cylinder 48 that constitutes the grill exhaust portion 105 that exhausts the cooked exhaust generated from the grill portion 102 is disposed upward from the top plate 1. It is good also as a structure comprised so that it may protrude and the said infrared intensity detection part 40 is accommodated in this exhaust pipe 48 inside.

(2) In the second embodiment, the window portion made of a translucent material different from the material constituting the top plate is formed on a part of the top plate. However, instead of such a configuration, The top plate is made of a translucent material that transmits infrared light, for example, crystallized glass, and the outer peripheral edge of the top plate is surrounded by a rectangular reinforcing frame. The window portion is formed by the entirety of the flat plate surface forming portion surrounded by the reinforcing frame so as to reflect the infrared ray radiated from the bottom of the cooking container and guide it to the infrared intensity detecting portion. The infrared reflector may be provided on the lower surface side of the window portion.

(3) In each of the above-described embodiments, the heating means is provided with a burner that ejects the air-fuel mixture outward and upward. Instead of such a configuration, the air-fuel mixture is directed inward from the annular casing member. You may comprise by the internal flame type burner which is made to jet and burn.

(4) In the above embodiment, the infrared intensity detection means includes two infrared detection elements that individually detect the infrared rays that have passed through the two band pass filters, and the infrared rays emitted from the heated object N Although configured to detect the infrared intensity for each of two different wavelength ranges, instead of such a configuration, the position where two band-pass filters act alternately on one infrared detection element. It is good also as a structure which detects infrared rays intensity | strength of a mutually different wavelength range using the detection value of the infrared detection element in each of the switched state.

(5) In the above-described embodiment, as the process for obtaining the temperature by the temperature detection means, the temperature of the object to be heated is obtained based on the ratio of the infrared intensity for each of the two wavelength ranges. Instead, it may be configured as follows.
For example, by using a plurality of objects to be heated having different emissivities, the temperatures of the objects to be heated are changed to a plurality of temperatures, and for each of a plurality of temperatures, an infrared intensity for each of the plurality of wavelength ranges is obtained. The infrared intensity for each of the plurality of wavelength ranges thus obtained is stored as map data in a state corresponding to each of the plurality of temperatures. Then, from the map data, an infrared intensity relationship that matches or is similar to the infrared intensity relationship for each of the plurality of wavelength ranges detected by the infrared intensity detection means, and the determined infrared intensity relationship The temperature corresponding to is obtained, and the obtained temperature is set as the temperature of the object to be heated.
Incidentally, in this case, the plurality of wavelength ranges may be two wavelength ranges as in the above embodiment, or may be three or more wavelength ranges.

  Further, one wavelength range is set as the wavelength range, and the infrared intensity for the wavelength range is stored as map data in a state corresponding to a plurality of temperatures, and the map data and the wavelength range are stored in the wavelength range. It is good also as a structure which calculates | requires the temperature of the container for cooking from the detected value of infrared intensity.

(6) In the above embodiment, an example using a burner as the heating means has been exemplified, but the heating means is not limited to the burner, for example, using a halogen lamp that emits red heat, or incorporating an electric resistance wire. You may comprise by an electric heating part, such as what uses a sheathed heater, or the thing using the magnetic field generation coil which performs electromagnetic induction heating (usually called "IH").

Schematic showing the stove installation status Schematic configuration diagram of the stove Figure showing the infrared radiation intensity spectrum distribution emitted from the flame The figure which shows the relationship between the temperature of a to-be-heated material, and the output of an infrared intensity detection part The figure which shows the relationship between the temperature of to-be-heated material and the output ratio of an infrared intensity detection part Schematic configuration diagram of a stove according to another embodiment Schematic configuration diagram of a stove according to another embodiment Schematic which shows the installation state of the stove of another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Top plate 3 Heating means 40 Infrared intensity detection means 44, 47 Infrared reflector 50 Temperature detection means D Light guide part N Cooking container

Claims (5)

Infrared intensity detection for detecting the intensity of the infrared radiation emitted from the bottom of the cooking container heated by the heating means and the cooking container that is mounted and supported in a state of being positioned above the top plate A heating cooker comprising means and temperature detecting means for detecting the temperature of the cooking container based on detection information of the infrared intensity detecting means,
The infrared intensity detecting means is provided on the upper side of the top plate and in a state located in a position spaced apart from the heating means in the horizontal direction,
A heating cooker provided with a light guide that guides infrared rays radiated from the bottom of the cooking container to the infrared intensity detecting means.   The cooking device according to claim 1, wherein the light guide is provided on the top plate.   The cooking device according to claim 2, wherein the light guide unit is configured by an infrared reflector that reflects infrared rays radiated from the bottom of the cooking container and guides the infrared rays to the infrared intensity detecting means.   The cooking device according to claim 3, wherein the infrared reflector is provided on an upper surface side of the top plate. A window part capable of transmitting infrared rays is formed on a part of the top plate,
The cooking device according to claim 3, wherein the infrared reflector is provided on a lower surface side of the window portion in a form of reflecting infrared rays that pass through the window portion.

Images