Induction heating conditioner

Abstract

To provide an induction heating cooker capable of improving aesthetics without reducing the detection accuracy of a sensor.SOLUTION: A disclosed induction heating cooker includes: a top plate on which a heated object is placed and in an area where the heated object is placed a transparent window transmitting infrared rays is formed; a heating coil unit placed bellow the top plate for heating the heated object; and an infrared sensor unit provided to the heating coil unit for detecting infrared. The infrared sensor unit includes: an infrared sensor; a board on which the infrared sensor is mounted; and a holder that holds the board. The holder includes: a holder body for mounting the board; a light guide tube extending toward the transparent window of the top plate from the holder body for guiding the infrared to the infrared sensor; and an aperture placed between the upper end and the lower end of the light guide tube for focussing the infrared guided by the light guide tube to infrared sensor. The holder body, light guide tube and aperture are integrally formed.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to an induction cooker. [Background technology]

[0002] Patent Document 1 discloses an induction heating cooker that has a heating section on which an object to be heated is placed and heated, an infrared sensor that detects infrared rays is located below a light-transmitting top plate, and a light-guiding tube that guides infrared rays emitted from the object to be heated to the infrared sensor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-153046 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for induction cooking appliances that have improved aesthetics without reducing the detection accuracy of the sensor.

[0005] Therefore, an object of the present disclosure is to solve the above-mentioned problems and to provide an induction heating cooker that improves aesthetics without reducing the detection accuracy of the sensor. [Means for solving the problem]

[0006] An induction heating cooker according to one aspect of the present disclosure includes: a top plate on which an object to be heated is placed and which has a transmission window that transmits infrared rays in an area where the object to be heated is placed; a heating coil unit disposed below the top plate and configured to heat the object to be heated; an infrared sensor unit disposed on the heating coil unit and detecting the infrared rays; Equipped with The infrared sensor unit An infrared sensor; a substrate on which the infrared sensor is mounted; a holder for holding the substrate; Including, The holder is a holder body to which the substrate is attached; a light guide tube extending from the holder body toward the transmission window of the top plate and guiding the infrared light to the infrared sensor; a diaphragm provided between an upper end and a lower end of the light guide tube, the diaphragm narrowing the infrared light guided to the infrared sensor by the light guide tube; and The holder body, the light guide tube, and the diaphragm are integrally formed. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an induction heating cooker that improves aesthetics without reducing the detection accuracy of the sensor. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic perspective view showing an example of an induction heating cooker according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic plan view showing an example of a heating coil unit. [Figure 3] FIG. 3 is a schematic exploded perspective view of the heating coil unit of FIG. 2. [Figure 4] FIG. 2 is a schematic perspective view showing an example of an infrared sensor unit. [Figure 5] FIG. 5 is a schematic exploded perspective view of the infrared sensor unit of FIG. 4. [Figure 6] FIG. 2 is a schematic enlarged cross-sectional view of a part of the induction heating cooker. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Background to this disclosure) An induction cooker is known in which an infrared sensor unit is disposed below a top plate to detect infrared rays emitted from an object to be heated. The infrared sensor unit detects infrared rays that pass through a transmission window provided in the top plate.

[0010] The transmission window is made of, for example, transparent glass. Therefore, components arranged below the top plate may be visible through the transmission window. For example, an infrared sensor may be visible from above the top plate through the transmission window, which detracts from the aesthetic appeal of the induction cooking appliance.

[0011] For example, the infrared sensor unit includes a light guide tube that guides infrared rays to the infrared sensor and an aperture that limits the amount of infrared light. The light guide tube and aperture are located below the transmission window, and by hiding the infrared sensor, the infrared sensor is prevented from being seen through the transmission window.

[0012] However, the aperture has a through-hole to allow infrared light to pass through, making it difficult to completely hide the infrared sensor. While efforts have been made to reduce the size of the aperture's through-hole, assembly errors during assembly of the infrared sensor unit can lead to misalignment of the light guide tube and aperture. For example, if the light guide tube and aperture are separate parts from the holder on which the infrared sensor is attached, assembly errors are likely to be large.

[0013] Therefore, if the size of the aperture through-hole is reduced, the infrared rays guided to the infrared sensor may be blocked by the aperture if there is a misalignment due to assembly error, which may reduce the detection accuracy of the infrared sensor.To avoid a reduction in the detection accuracy of the infrared sensor due to assembly error, it is necessary to design the size of the aperture through-hole to be somewhat larger, taking assembly error into consideration.

[0014] Thus, although it is desirable to reduce the size of the aperture through-hole from an aesthetic point of view, it is difficult to reduce the size of the aperture through-hole from the viewpoint of suppressing a decrease in the detection accuracy of the infrared sensor due to assembly errors.

[0015] Therefore, the inventors discovered a configuration that reduces assembly errors and reduces the size of the through-hole in the diaphragm by forming the holder for attaching the infrared sensor integrally with the light guide tube and the diaphragm, leading to the present disclosure.

[0016] An embodiment of the present disclosure will be described below with reference to the accompanying drawings. Note that the following description is merely exemplary in nature and is not intended to limit the present disclosure, its applications, or its uses. Furthermore, the drawings are schematic, and the ratios of the dimensions and the like do not necessarily correspond to reality.

[0017] It should be noted that, in this specification, terms such as "first," "second," etc. are used for descriptive purposes only and should not be understood as expressing or implying the relative importance or ranking of technical features. Features qualified as "first" and "second" expressly or imply the inclusion of one or more of such features.

[0018] (Embodiment 1) [Overall configuration] 1 is a schematic perspective view of an example of an induction heating cooker 1 according to a first embodiment of the present disclosure. Note that the XYZ coordinate system shown in the figure is intended to facilitate understanding of the invention and does not limit the invention. The X-axis direction indicates the left-right direction, the Y-axis direction indicates the front-rear direction, and the Z-axis direction indicates the vertical direction.

[0019] As shown in Fig. 1, the induction heating cooker 1 is a cooker that induction heats a cooking container C that contains an object to be cooked T. In this specification, the cooking container C is described as an example of an object to be heated. The object to be heated is not limited to the cooking container C, and may be any object that can be induction heated.

[0020] As shown in Fig. 1, induction cooking appliance 1 has a configuration in which a top plate 3 is placed on a housing 2. In this embodiment, induction cooking appliance 1 is a so-called built-in type induction cooking appliance. In induction cooking appliance 1, housing 2 is embedded in an opening in a kitchen counter, and top plate 3 is placed on the periphery of the opening.

[0021] <Case> The housing 2 houses each component of the induction heating cooker 1. The housing 2 houses the heating coil unit 4. The housing 2 also houses a control unit that controls the heating coil unit 4. For example, the housing 2 has a box-like shape with an open top.

[0022] <Top plate> The top plate 3 is disposed on top of the housing 2 and is used to place an object to be heated. The top plate 3 is made of a rectangular glass plate in a plan view. In this specification, "plan view" means viewing from the vertical direction, i.e., the Z-axis direction. In other words, "plan view" means viewing from the thickness direction of the top plate 3.

[0023] For example, the top plate 3 is made of glass, such as crystallized glass or borosilicate glass, which has a low coefficient of thermal expansion and is resistant to thermal shock. Ink of various colors can be printed on the back surface of the top plate 3, improving the aesthetic appearance. In this embodiment, the top plate 3 is made of crystallized glass.

[0024] The top plate 3 is provided with a transmission window 5 that transmits infrared rays. The transmission window 5 is provided in an area where an object to be heated is placed. For example, the transmission window 5 is provided in an area where the heating coil unit 4 is arranged in a plan view, i.e., in a heating area where the object to be heated is heated by the heating coil unit 4. The transmission window 5 is, for example, a transparent glass portion that has a circular shape in a plan view.

[0025] In this embodiment, two transmission windows 5 are provided. The number of transmission windows 5 is not limited to two. For example, it is sufficient that one or more transmission windows 5 are provided.

[0026] <Heating coil unit> The heating coil unit 4 is disposed below the top plate 3 and inductively heats an object to be heated. In this embodiment, three heating coil units 4 are disposed inside the housing 2. The number of heating coil units 4 is not limited to three. For example, the number of heating coil units 4 may be one or more.

[0027] Fig. 2 is a schematic plan view showing an example of the heating coil unit 4. Fig. 3 is a schematic exploded perspective view of the heating coil unit 4 of Fig. 2. As shown in Figs. 2 and 3, the heating coil unit 4 includes a coil unit housing 11, a heating coil 12, and an insulating plate 13.

[0028] The coil unit housing 11 has a substantially circular shape in a plan view, and houses the heating coil 12 therein.

[0029] The heating coil 12 is a coil formed by winding a conductive member. The heating coil 12 is controlled by a control unit, and inductively heats an object to be heated placed on the top plate 3.

[0030] The insulating plate 13 is disposed above the heating coil 12. Specifically, the insulating plate 13 is disposed between the heating coil 12 and the top plate 3. The insulating plate 13 is formed of a material such as mica.

[0031] The insulating plate 13 is provided with a first through hole 14 penetrating in the thickness direction. In plan view, the first through hole 14 is provided at a position overlapping with the transmission window 5 of the top plate 3. For example, the first through hole 14 has a circular shape in plan view.

[0032] The heating coil unit 4 is provided with an infrared sensor unit 6 .

[0033] <Infrared sensor unit> The infrared sensor unit 6 is disposed in the heating coil unit 4 and detects infrared rays emitted from the object to be heated.

[0034] Fig. 4 is a schematic perspective view showing an example of the infrared sensor unit 6. Fig. 5 is a schematic exploded perspective view of the infrared sensor unit 6 of Fig. 4. As shown in Figs. 4 and 5, the infrared sensor unit 6 includes an infrared sensor 21, a substrate 22, and a holder 23.

[0035] The infrared sensor 21 is a sensor that detects infrared rays.

[0036] The substrate 22 is a substrate on which the infrared sensor 21 is mounted.

[0037] The holder 23 holds the substrate 22. The holder 23 includes a holder body 24, a light guide tube 25, and a diaphragm 26.

[0038] The holder body 24 is a housing to which the substrate 22 is attached. The holder 23 houses the substrate 22 therein. In this embodiment, the substrate 22 is attached to a plate 29 (described later) and is attached to the holder body 24 via the plate 29.

[0039] The light guide tube 25 is a tubular body that extends from the holder body 24 toward the transmission window 5 of the top plate 3. The light guide tube 25 guides infrared rays emitted from the object to be heated to the infrared sensor 21. The light guide tube 25 has, for example, a cylindrical shape.

[0040] The diaphragm 26 is provided between the upper and lower ends of the light guide tube 25. The diaphragm 26 narrows the infrared light guided to the infrared sensor 21 by the light guide tube 25. In other words, the diaphragm 26 limits the amount of infrared light that passes through the inside of the light guide tube 25 and enters the infrared sensor 21. The diaphragm 26 has a disk shape and has a through-hole provided in the center. The size of the through-hole of the diaphragm 26 is, for example, not less than 3 mm and not more than 4.5 mm. Preferably, the size of the through-hole of the diaphragm 26 is 4 mm.

[0041] The holder body 24, the light guide tube 25, and the aperture 26 are integrally formed. For example, the holder body 24, the light guide tube 25, and the aperture 26 are integrally molded from resin. For example, the holder body 24, the light guide tube 25, and the aperture 26 are formed from polybutylene terephthalate resin (PBT). The holder body 24, the light guide tube 25, and the aperture 26 may also be formed from polyphenylene sulfide (PPS), liquid crystal polymer (LCP), or other thermosetting resins. By forming the light guide tube 25 and the aperture 26 from these resins, the heat resistance of the holder body 24 can be improved. In this embodiment, the light guide tube 25 can be positioned at a certain distance from the top plate 3, making it less susceptible to heat and reducing the heat resistance required compared to conventional devices. Therefore, the holder body 24, the light guide tube 25, and the aperture 26 can be formed from relatively inexpensive PBT, thereby reducing the manufacturing cost of the infrared sensor unit 6.

[0042] The infrared sensor unit 6 also includes a filter 27 and a filter cover .

[0043] The filter 27 is disposed between the diaphragm 26 and the infrared sensor 21, and is a filter that cuts out visible light and transmits infrared light. The filter 27 prevents disturbance light, such as visible light, emitted from sources other than the object to be heated from reaching the infrared sensor 21.

[0044] The filter cover 28 is a cover that holds the outer periphery of the filter 27. The filter cover 28 includes a first filter cover 28a and a second filter cover 28b. For example, the first filter cover 28a and the second filter cover 28b have a cylindrical shape.

[0045] The filter 27 is held by being sandwiched between the first filter cover 28a and the second filter cover 28b.

[0046] The infrared sensor unit 6 also includes a plate 29 to which the substrate 22 and the filter cover 28 are attached.

[0047] The plate 29 is a plate-like member having a first main surface PS1 and a second main surface PS2 facing the first main surface PS1. For example, the plate 29 is made of a metal plate. The plate 29 is provided with a second through-hole 30 that penetrates the first main surface PS1 and the second main surface PS2. For example, the second through-hole 30 has a circular shape in a plan view.

[0048] The substrate 22 is disposed on the first main surface PS1 of the plate 29. In plan view, the infrared sensor 21 is mounted on the substrate 22 at a position overlapping the second through-hole 30. For example, the substrate 22 is attached to the plate 29 with screws or the like.

[0049] The filter 27 and the filter cover 28 are disposed on the second main surface PS2 of the plate 29. In a plan view, the filter 27 and the filter cover 28 are positioned on the second main surface PS2 of the plate 29 at positions that overlap with the second through-holes 30. For example, the plate 29 is provided with positioning holes 31 around the second through-holes 30. The filter cover 28 has a protrusion 32 that is inserted into the hole 31. By inserting the protrusion 32 of the filter cover 28 into the hole 31, the filter 27 and the filter cover 28 are attached to the plate 29 while being positioned in the second through-holes 30.

[0050] Fig. 6 is a schematic enlarged cross-sectional view of a part of the induction heating cooker 1. As shown in Fig. 6, a heating coil unit 4 is disposed below the top plate 3, and an infrared sensor unit 6 is disposed in the heating coil unit 4.

[0051] In a plan view, the transmission window 5 of the top plate 3 and the first through-hole 14 of the insulating plate 13 are provided at an overlapping position. In addition, in a plan view, the infrared sensor unit 6 is disposed at a position overlapping with the transmission window 5 of the top plate 3 and the first through-hole 14 of the insulating plate 13. Specifically, the light guide tube 25 of the infrared sensor unit 6 is disposed at a position overlapping with the transmission window 5 and the first through-hole 14 in a plan view.

[0052] The light guide tube 25 is located below the insulating plate 13. Specifically, the upper end of the light guide tube 25 is located below the insulating plate 13. Furthermore, the light guide tube 25 is disposed inside the heating coil unit 4 without contacting the insulating plate 13.

[0053] In a plan view, the outer diameter of the light guide tube 25 is smaller than the first through hole 14. In addition, in a plan view, the inner diameter of the light guide tube 25 is larger than the transmission window 5. The light guide tube 25 is a component arranged below the top plate 3, and can hide components arranged near the lower side of the transmission window 5. As a result, the components arranged below the top plate 3 are hidden by the light guide tube 25, and it is possible to prevent them from being seen through the transmission window 5. In addition, because the inner diameter of the light guide tube 25 is larger than the transmission window 5, it is possible to prevent components other than the inner wall of the light guide tube 25 and the diaphragm 26 from being seen through the transmission window 5 even if the light guide tube 25 is misaligned.

[0054] The diaphragm 26 is provided between the upper end and the lower end of the light guide tube 25. Specifically, the diaphragm 26 is provided midway inside the light guide tube 25 in the thickness direction of the top plate 3. Therefore, inside the light guide tube 25, a space is formed between the lower end of the light guide tube 25 and the diaphragm 26 in which the filter 27 and the filter cover 28 can be placed. This allows the filter 27 and the filter cover 28 to be placed inside the light guide tube 25, i.e., between the lower end of the light guide tube 25 and the diaphragm 26.

[0055] The control unit housed inside the housing 2 controls the heating coil unit 4 and the infrared sensor unit 6. Specifically, the control unit is configured with a control board on which circuits for controlling the induction heating cooker 1, such as an inverter, are mounted.

[0056] The control board includes, for example, a memory (not shown) that stores a program for controlling the induction heating cooker 1, and a processing circuit (not shown) that corresponds to a processor such as a CPU (Central Processing Unit).

[0057] For example, the control unit controls the output of the heating coil unit 4 based on information about infrared rays detected by the infrared sensor unit 6.

[0058] [effect] According to the induction heating cooker 1 according to the first embodiment, the following effects can be achieved.

[0059] The induction heating cooker 1 according to the first embodiment includes a top plate 3, a heating coil unit 4, and an infrared sensor unit 6. The top plate 3 has a transmission window 5 on which an object to be heated is placed, and the area where the object to be heated is placed has a transmission window 5 through which infrared rays pass. The heating coil unit 4 is disposed below the top plate 3 and heats the object to be heated. The infrared sensor unit 6 is disposed on the heating coil unit 4 and detects infrared rays. The infrared sensor unit 6 also includes an infrared sensor 21, a board 22 on which the infrared sensor 21 is mounted, and a holder 23 that holds the board 22. The holder 23 has a holder main body 24, a light guide tube 25, and an aperture 26. The board 22 is attached to the holder main body 24. The light guide tube 25 extends from the holder main body 24 toward the transmission window 5 of the top plate 3 and guides infrared rays to the infrared sensor 21. The aperture 26 is disposed between the upper and lower ends of the light guide tube 25 and narrows the infrared rays guided by the light guide tube 25 to the infrared sensor 21. The holder body 24, the light guide tube 25 and the diaphragm 26 are integrally formed.

[0060] This configuration improves aesthetics without reducing the detection accuracy of the infrared sensor. Specifically, the induction cooking appliance 1 includes a holder 23 that holds a substrate 22 on which the infrared sensor 21 is mounted. The holder 23 is integrally formed with the holder body 24, light guide tube 25, and diaphragm 26. This reduces assembly errors of the infrared sensor unit 6. When the holder body 24, light guide tube 25, and diaphragm 26 are integrally formed, the positions of the holder body 24, light guide tube 25, and diaphragm 26 are uniquely determined. This reduces assembly errors, allowing the light guide tube 25 and diaphragm 26 to be accurately positioned relative to the infrared sensor 21, thereby reducing misalignment of the light guide tube 25 and diaphragm 26 relative to the infrared sensor 21. As a result, the diaphragm 26 is less likely to block the infrared light guided to the infrared sensor 21, reducing the detection accuracy of the infrared sensor 21. This eliminates the need to design the diaphragm 26 with a large through-hole to accommodate assembly errors, allowing the size of the diaphragm 26 to be reduced. When the size of the through-hole of the aperture 26 is reduced, the infrared sensor 21 becomes more difficult to see through the aperture 26, and therefore it is possible to prevent the infrared sensor 21 from being seen through the transmission window 5. Therefore, in the induction heating cooker 1, it is possible to prevent the infrared sensor 21 from being seen through the transmission window 5 without reducing the accuracy of infrared detection by the infrared sensor 21, thereby improving aesthetics.

[0061] Furthermore, by forming the holder body 24, the light guide tube 25, and the diaphragm 26 integrally, a structure for connecting the various parts is not required, and the infrared sensor unit 6 can be made smaller.

[0062] The heating coil unit 4 includes a heating coil 12 and an insulating plate 13 disposed between the heating coil 12 and the top plate 3. The insulating plate 13 has a first through-hole 14 formed in a position overlapping the transmission window 5 of the top plate 3 in a plan view. The light guide tube 25 of the infrared sensor unit 6 is disposed in a position overlapping the first through-hole 14 in a plan view and below the insulating plate 13. This configuration allows the light guide tube 25 to be spaced apart from the top plate 3 and the insulating plate 13, thereby reducing the transfer of heat from the top plate 3 and the insulating plate 13 to the light guide tube 25. For example, the area between the top plate 3, where the heating target is placed, and the insulating plate 13 is prone to become hot. By disposing the light guide tube 25 below the insulating plate 13, this area can be avoided. Furthermore, the required heat resistance grade of the material forming the light guide tube 25 can be lowered, thereby reducing the manufacturing cost of the infrared sensor unit 6. Furthermore, it is possible to prevent the light guide tube 25 from coming into contact with the top plate 3 due to an impact during transportation, etc., and damaging the top plate 3.

[0063] In plan view, the inner diameter of the light guide tube 25 is larger than the transmission window 5. With this configuration, the light guide tube 25 can hide the components arranged below the transmission window 5. Furthermore, even if the light guide tube 25 is misaligned, it is possible to prevent the components arranged below the transmission window 5 from being seen. This improves aesthetics.

[0064] The infrared sensor unit 6 is disposed between the aperture 26 and the infrared sensor 21 and includes a filter 27 that blocks visible light and transmits infrared light, and a filter cover 28 that holds the outer periphery of the filter 27. Even when the infrared sensor unit 6 is configured to include the filter 27 and the filter cover 28, the filter 27 and the filter cover 28 are difficult to see through the transmission window 5. Therefore, the infrared sensor unit 6 that includes the filter 27 and the filter cover 28 looks the same in appearance as an infrared sensor unit that does not include the filter 27 and the filter cover 28. This allows for a unified appearance, improving aesthetics. Furthermore, the detection accuracy of the infrared sensor 21 can also be improved.

[0065] The filter 27 and the filter cover 28 are disposed inside the light guide tube 25. With this configuration, the space inside the light guide tube 25 can be used effectively, and the induction heating cooker 1 can be made even more compact.

[0066] The induction cooking appliance 1 includes a plate 29 having a first main surface PS1 and a second main surface PS2 opposite the first main surface PS1. The substrate 22 is disposed on the first main surface PS1 of the plate 29, and the filter 27 and the filter cover 28 are disposed on the second main surface PS2 of the plate 29. The plate 29 is provided with a second through-hole 30 penetrating the first main surface PS1 and the second main surface PS2. The infrared sensor 21 is mounted on the substrate 22 at a position overlapping the second through-hole 30, and the filter 27 and the filter cover 28 are positioned on the second main surface PS2 of the plate 29 at a position overlapping the second through-hole 30. This configuration allows the infrared sensor 21, the substrate 22, the filter 27, and the filter cover 28 to be positioned and attached to the plate 29. Therefore, by attaching the plate 29 to the holder 23, the infrared sensor 21, the substrate 22, the filter 27, and the filter cover 28 can be easily attached to the holder 23.

[0067] The holder body 24, the light guide tube 25, and the diaphragm 26 are made of polybutylene terephthalate resin. With this configuration, the cost of the components of the infrared sensor unit 6 can be reduced.

[0068] In the present embodiment, an example has been described in which the infrared sensor unit 6 includes the filter 27 and the filter cover 28, but the present invention is not limited to this. For example, the infrared sensor unit 6 does not necessarily have to include the filter 27 and the filter cover 28.

[0069] In the present embodiment, an example has been described in which the heating coil unit 4 includes the insulating plate 13, but the present invention is not limited to this. For example, the heating coil unit 4 does not necessarily have to include the insulating plate 13.

[0070] In the present embodiment, an example has been described in which the transmission window 5, the first through-hole 14, and the second through-hole 30 are circular in plan view, but the present invention is not limited to this. For example, the transmission window 5, the first through-hole 14, and the second through-hole 30 may be elliptical, triangular, rectangular, polygonal, or the like in plan view.

[0071] In this embodiment, the light guide tube 25 has been described as having a cylindrical shape, but is not limited to this. For example, the light guide tube 25 may have a rectangular prism shape.

[0072] In the present embodiment, the plate 29 is a metal plate, but the plate 29 is not limited to this. For example, the plate 29 may be made of resin.

[0073] <Variation 1> The infrared sensor unit 6 may include a first infrared sensor unit and a second infrared sensor unit. The first infrared sensor unit and the second infrared sensor unit may include different infrared sensors. In this case, the color of the first light guide tube of the first infrared sensor unit may be the same as the color of the second light guide tube of the second infrared sensor unit. For example, the first infrared sensor unit may include a first infrared sensor that uses the filter 27, and the second infrared sensor unit may include a second infrared sensor that does not use the filter 27. That is, the first infrared sensor unit may include the filter 27, and the second infrared sensor unit may not include the filter 27. In this way, in a configuration including multiple infrared sensor units using different infrared sensors, the presence or absence of the filter 27 is difficult to see from the outside, allowing for a unified external appearance.

[0074] In the first modification, the second infrared sensor unit does not include the filter 27. However, the present invention is not limited to this. For example, the second infrared sensor unit may include a filter different from that of the first infrared sensor unit.

[0075] <Variation 2> The infrared sensor unit 6 may include a first infrared sensor unit and a second infrared sensor unit. The first infrared sensor of the first infrared sensor unit may be different from the second infrared sensor of the second infrared sensor unit, and the color of the first light guide tube of the first infrared sensor unit may be different from the color of the second light guide tube of the second infrared sensor unit. The top plate 3 may be provided with a first transmission window above the first infrared sensor unit and a second transmission window above the second infrared sensor unit. With this configuration, the color of the first light guide tube seen through the first transmission window appears different from the color of the second light guide tube seen through the second transmission window. This makes it visually easy to see that different infrared sensor units are provided.

[0076] As described above, the above embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate.

[0077] Although the present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art, and such changes and modifications are to be understood as being included within the scope of the present disclosure as defined by the appended claims unless they depart therefrom.

[0078] (Outline of the embodiment) (1) The induction heating cooker of the present disclosure comprises a top plate on which an object to be heated is placed and which has a transparent window that transmits infrared rays in the area where the object to be heated is placed, a heating coil unit that is arranged below the top plate and heats the object to be heated, and an infrared sensor unit that is arranged in the heating coil unit and detects infrared rays, wherein the infrared sensor unit includes an infrared sensor, a board on which the infrared sensor is mounted, and a holder that holds the board, and the holder has a holder body to which the board is attached, a light guide tube that extends from the holder body toward the transparent window of the top plate and guides infrared rays to the infrared sensor, and an aperture that is arranged between the upper and lower ends of the light guide tube and narrows the infrared rays guided by the light guide tube to the infrared sensor, and the holder body, light guide tube, and aperture are formed as a single unit.

[0079] (2) In the induction heating cooker of (1), the heating coil unit may include a heating coil and an insulating plate arranged between the heating coil and the top plate, and the insulating plate may have a first through hole at a position overlapping the transmission window of the top plate in a planar view, and the light guide tube of the infrared sensor unit may be arranged at a position overlapping the first through hole in a planar view and may be located below the insulating plate.

[0080] (3) In the induction cooking device of (1) or (2), the inner diameter of the light guide tube may be larger than the transmission window in a plan view.

[0081] (4) In any of the induction heating cookers (1) to (3), the infrared sensor unit may further include a filter disposed between the aperture and the infrared sensor, which blocks visible light and transmits infrared light, and a filter cover which holds the outer periphery of the filter.

[0082] (5) In the induction cooking device according to any one of (1) to (4), the filter and the filter cover may be disposed inside the light guide tube.

[0083] (6) In the induction heating cooker of (5), the cooker may further include a plate having a first main surface and a second main surface opposite the first main surface, the substrate may be arranged on the first main surface of the plate, the filter and filter cover may be arranged on the second main surface of the plate, the plate may have a second through hole passing through the first main surface and the second main surface, the infrared sensor may be mounted on the substrate at a position overlapping with the second through hole, and the filter and filter cover may be positioned on the second main surface of the plate at a position overlapping with the second through hole.

[0084] (7) In the induction cooking device of any one of (1) to (6), the holder body, the light guide tube, and the diaphragm may be made of polybutylene terephthalate resin.

[0085] (8) In any of the induction heating cookers (1) to (7), the infrared sensor unit may include a first infrared sensor unit and a second infrared sensor unit, and the infrared sensor of the first infrared sensor unit may be different from the infrared sensor of the second infrared sensor unit.

[0086] (9) In the induction heating cooker of (8), the first infrared sensor unit may be arranged between the aperture and the infrared sensor and may have a filter that cuts visible light and transmits infrared light, and the second infrared sensor unit may have no filter or may have a filter different from the filter of the first infrared sensor unit.

[0087] (10) In the induction cooking device of (8) or (9), the color of the light guide tube of the first infrared sensor unit may be different from the color of the light guide tube of the second infrared sensor unit. [Industrial Applicability]

[0088] The induction heating cooker of the present disclosure is applicable to induction heating cookers equipped with an infrared sensor unit. [Explanation of symbols]

[0089] 1 induction cooker 2. Case 3 Top Plate 4 Heating coil unit 5. Transparent window 6 Infrared sensor unit 11 Coil unit housing 12 Heating coil 13 Insulating plate 14 First through hole 21 Infrared sensor 22 PCB 23 Holder 24 Holder body 25 Light guide tube 26 Aperture 27 Filters 28 Filter cover 28a First filter cover 28b Second filter cover 29 Plate 30 Second through hole

Claims

1. a top plate on which an object to be heated is placed and which has a transmission window that transmits infrared rays in an area where the object to be heated is placed; a heating coil unit disposed below the top plate and configured to heat the object to be heated; an infrared sensor unit disposed on the heating coil unit and detecting the infrared rays; Equipped with The infrared sensor unit An infrared sensor; a substrate on which the infrared sensor is mounted; a holder for holding the substrate; a plate having a first main surface and a second main surface opposite to the first main surface; a filter that blocks visible light and transmits the infrared light; a filter cover that holds the outer periphery of the filter; Including, The holder is a holder body to which the substrate is attached; a light guide tube extending from the holder body toward the transmission window of the top plate and guiding the infrared light to the infrared sensor; a diaphragm provided between an upper end and a lower end of the light guide tube, the diaphragm narrowing the infrared light guided to the infrared sensor by the light guide tube; and The holder body, the light guide tube, and the diaphragm are integrally formed, the filter is disposed between the aperture and the infrared sensor; the substrate is disposed on the first major surface of the plate; the filter and the filter cover are disposed on the second main surface of the plate; Induction heating cooker.

2. The heating coil unit comprises: A heating coil; an insulating plate disposed between the heating coil and the top plate; Including, a first through hole is provided in the insulating plate at a position overlapping the transmission window of the top plate in a plan view; the light guide tube of the infrared sensor unit is disposed at a position overlapping the first through hole in a plan view and is positioned below the insulating plate; The induction heating cooker according to claim 1 .

3. The inner diameter of the light guide tube is larger than the transmission window in a plan view.

3. The induction heating cooker according to claim 1 or 2.

4. the filter and the filter cover are disposed inside the light guide tube; 3. The induction heating cooker according to claim 1 or 2.

5. The plate is provided with a second through hole penetrating the first main surface and the second main surface, the infrared sensor is mounted on the substrate at a position overlapping the second through hole; 3. The induction heating cooker according to claim 1 or 2.

6. The filter and the filter cover are positioned on the second main surface of the plate at a position overlapping the second through hole. The induction heating cooker according to claim 5.

7. the holder body, the light guide tube, and the diaphragm are made of polybutylene terephthalate resin; 3. The induction heating cooker according to claim 1 or 2.

8. the infrared sensor unit includes a first infrared sensor unit and a second infrared sensor unit; the infrared sensor of the first infrared sensor unit is different from the infrared sensor of the second infrared sensor unit; 3. The induction heating cooker according to claim 1 or 2.

9. the first infrared sensor unit is disposed between the diaphragm and the infrared sensor and includes a filter that cuts visible light and transmits the infrared light; the second infrared sensor unit does not include the filter or includes a filter different from the filter of the first infrared sensor unit; The induction heating cooker according to claim 8.

10. the color of the light guide tube of the first infrared sensor unit is different from the color of the light guide tube of the second infrared sensor unit; The induction heating cooker according to claim 8.

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