JP6258238B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker that receives infrared light below a top plate.

There is an induction heating cooker as disclosed in Patent Document 1 as a conventional technique. A main body, a top plate that covers the upper portion of the main body, a heating coil provided in the main body below the top plate, a high-frequency power supply circuit that supplies power to the heating coil, and a control that controls the high-frequency power supply circuit A heated object such as a pan placed on the top plate is heated by induction. Using a thermopile that receives infrared rays emitted from the object to be heated and converts it into an electrical signal, it detects the temperature of the object to be heated in a non-contact manner and controls the main unit. And it has an amplification circuit that amplifies the weak output signal of the thermopile, and the thermopile and the amplification circuit are mounted on the same board (printed wiring board).

JP 2014-179246 A

  However, when a colorless and transparent top plate is used, in the prior art disclosed in Patent Document 1, when viewed through the optical path from above the top plate, the photo sensor substrate on which the thermopile is mounted is at a position where it can be seen. There was a problem that it was conspicuous and the designability deteriorated.

  Therefore, in the present invention, even when a colorless and transparent top plate is used, when viewed from above the top plate through the optical path, the optical sensor board on which the thermopile is mounted is made inconspicuous, and an induction heating cooker with good design is provided. The purpose is to provide.

The present invention has been made in order to solve the above-described problem. A top plate on which an object to be heated is placed, a heating coil that is disposed below the top plate and heats the object to be heated, and the heating coil An optical sensor unit provided with an inverter circuit for supplying electric power, a thermopile disposed below the top plate for detecting infrared rays radiated from the object to be heated, and an optical sensor substrate on which the thermopile is mounted, and the optical sensor Control means for controlling the heating power of the heating coil based on an output signal of the unit, and a cylindrical optical path arranged below the top plate and guiding infrared rays radiated from the heated object to the thermopile, The inner wall of the optical path is black, and the upper surface of the photosensor substrate has a blackish similar color that is darker than the inner wall of the optical path.

According to the present invention, when viewed from above the top plate through the optical path, the optical sensor substrate on which the thermopile is mounted can be made inconspicuous and the design can be improved.

It is a perspective view of the state where the induction heating cooking appliance explaining the example of the present invention was built in the system kitchen. It is a perspective view of the induction heating cooking appliance in the Example of this invention. It is a block diagram explaining the circuit structure of the induction heating cooking appliance in the Example of this invention. It is a figure which shows the arrangement | positioning relationship of the to-be-heated material, the top plate, the heating coil, the optical path, and the optical sensor unit in the Example of this invention. It is an external view of the optical sensor board | substrate seen through an optical path from the top plate in the Example of this invention.

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

  FIG. 1 is a perspective view of a state in which an induction heating cooker illustrating Embodiment 1 of the present invention is incorporated in a system kitchen.

  In FIG. 1, 1 is a main body of an induction heating cooker. Reference numeral 2 denotes a top plate that covers the upper surface of the main body 1 and is made of a material having high heat resistance, such as crystallized glass or borosilicate glass, and a heated object 300 (FIG. 4) such as a pan is placed on the upper surface. Placed.

  Reference numeral 3 denotes a top plate frame that covers an end portion around the top plate 2, and a sealing material is filled between the top plates 2, whereby the top plate frame 3 is fixed to the top plate 2. Has been. And even if a liquid spills on the top plate 2, the sealing material prevents water from entering the inside of the main body 1, thereby realizing a watertight structure.

  The top plate frame 3 is also fixed to the main body 1, and when the main body 1 is assembled into the system kitchen 13, the main plate 1 is suspended from the top plate frame 3 and installed.

  Reference numerals 334, 335, and 336 denote pan position display units, which are provided on the top surface of the top plate 2 and display a place where the object to be heated 300 such as a pan is placed.

  Reference numerals 324, 325, and 326 are heating coils (FIG. 3), and are provided in the main body 1 below the pan position display portions 334, 335, and 336 so as to be substantially horizontal to the top plate 2. A high frequency current is applied to 325 and 326 to generate a high frequency magnetic field, and the object to be heated 300 such as a pan placed on the top plate 2 is induction heated.

  6 is a grill heating means, which is provided on the front side of the main body 1 on the left side or the right side (left side in the present embodiment) of the main body 1 below the heating coils 324, 325, 326, and is constituted by a rectangular box. And a heating means such as a sheathed heater for heating an object to be heated.

  Reference numeral 7 denotes a door of the grill heating means 6, which is provided with 7 a, and a receiving tray (not shown) that can be taken in and out with the door 7 is accommodated inside the grill heating means 6.

  Reference numeral 8 denotes an intake portion that opens to the rear frame portion of the top plate frame 3, and the intake portion 8 may be a front surface, a lower surface, or a side surface of the main body 1 as long as an opening for taking in air is provided. The intake section 8 takes in air that cools inverter circuits 304, 305, and 306 (FIG. 3), heating coils 324, 325, and 326, which will be described later.

  Reference numeral 9 denotes an exhaust portion that opens to the rear frame portion of the top plate frame 3, and exhausts air that has cooled the inverter circuits 304, 305, 306, the heating coils 324, 325, 326, and the like and smoke exhaust from the grill heating means 6. To do. The intake unit 8 and the exhaust unit 9 are connected to the inverter circuits 304, 305, 306, etc. in the main body 1 even if liquid spilled on the top plate 2 falls into the intake unit 8 or the exhaust unit 9 from the opening. The structure does not penetrate.

  Reference numeral 10 denotes an openable / retractable front operation unit that mainly operates the grill heating means 6 and is provided on the right side of the front surface of the main body 1 so as to be located next to the grill heating means 6 in this embodiment. .

  Further, when the front operation unit 10 is closed, the locking device (not shown) is released by pushing the upper part to the main body 1 side, and the upper part of the front operation unit 10 is provided with a spring and a control device (not shown). )), When it is closed, it is housed in the main body 1 by pushing the upper part toward the main body 1 and held by the locking device. ing.

  1 shows a state where the front operation unit 10 is open, and FIG. 2 shows a state where the front operation unit 10 is closed.

  The front operation key 10a of the front operation unit 10 performs operations such as turning on and off a heater 302 (FIG. 3) such as a sheathed heater of the grill heating means 6, and the content operated by the front operation key 10a is on the front display unit 10b. It is displayed in an easy-to-understand manner for the user.

  A power off / on switch 11 is provided on the front surface of the main body 1 to turn on / off the main power of the main body 1.

  An upper surface operation unit 12 is provided on the front side of the top plate 2 and includes an upper surface operation key 12a that adjusts the output and the like of the respective heating coils 324, 325, and 326.

  FIG. 3 is a block diagram illustrating a circuit configuration of the induction heating cooker.

  In FIG. 3, 301 is a commercial alternating current power source input to the induction heating cooker. Reference numeral 302 denotes a heater such as a sheathed heater that heats an object to be heated placed inside the grill heating means 6. A heater control circuit 303 controls energization of a heater 302 such as a sheathed heater. Reference numerals 304, 305, and 306 denote inverter circuits that control energization of the heating coils 324, 325, and 326, respectively.

  Reference numeral 307 denotes a control means constituted by a microcomputer, which inputs operation signals from the front operation key 10a and the upper operation key 12a and outputs a display signal to the front display unit 10b. In addition, a control signal is output to the heater control circuit 303 that controls energization of the heater 302 and the inverter circuits 304, 305, and 306 to control the power supplied to the heating coils 324, 325, and 326. And based on the output signal from the optical sensor unit 20, the temperature of the pan bottom of the article to be heated 300 is detected, and the electric power supplied from the inverter circuits 304, 305, 306 to the heating coils 324, 325, 326 as necessary. The temperature of the object to be heated 300 is controlled by controlling the heating power of the heating coils 324, 325, and 326.

  Reference numeral 308 denotes filter means equipped with a filter circuit, which suppresses noise generated from the inverter circuits 304, 305, and 306, and prevents noise noise from leaking to the commercial power supply 301.

  Reference numeral 20 denotes an optical sensor unit equipped with a thermopile 20b and an amplification circuit 20c that amplifies the output signal of the thermopile 20b, and detects the temperature of the heated object 300 in a non-contact manner by receiving infrared rays emitted from the heated object 300. To do.

  FIG. 4 is a diagram showing a positional relationship among the object to be heated 300, the top plate 2, the optical path 40, and the optical sensor unit 20 in the left heating coil 324. The heating coils 325 and 326 also have the same structure and will be described with the heating coil 324.

  The optical sensor unit 20 is disposed under the heating coil 324 and may be fixed to a coil base 50 on which the heating coil 324 is placed or a structure inside the main body 1, for example.

  The optical sensor unit 20 receives infrared rays emitted from an object to be heated 300 placed on the top plate 2 via a cylindrical optical path 40 provided below the top plate 2 and above the optical sensor unit 20. .

  The optical path 40 may be provided below the top plate 2 so as not to contact the lower surface of the top plate 2 and may be provided integrally with the coil base 50 or the optical sensor unit 20 or separately.

  FIG. 5 is an external view of the optical sensor substrate 20a seen through the optical path 40 when viewed from above the top plate 2.

  The inner wall 40a of the optical path 40 is black. For example, when producing with the structure of the coil base 50 or the optical sensor unit 20, it can be realized by using a black heat-resistant resin or the like.

  The upper surface 20 d of the optical sensor substrate 20 a of the optical sensor unit 20 has a similar black color similar to the inner wall 40 d of the optical path 40. For example, it can be realized by covering with black silk. Furthermore, it is better that there is no reflection of light when the matting is performed with a reduced gloss.

  The reason is that the inner wall 40 a of the cylindrical optical path 40 is substantially perpendicular to the upper surface of the top plate 2.

  Therefore, as the distance from the top plate 2 increases, the lower portion 40b shown in the figure is not easily exposed to the light in the room and becomes darker, but the angle seen from above the top plate 2 becomes tighter than just below the top plate 2. As the inner wall 40a is further away from the top plate 2, the lower portion 40b looks darker. That is, the inner wall 40a of the optical path 40 is far from the top plate 2, and the lower part 40b that is closer to the optical sensor substrate 20a of the optical sensor unit 20 appears darker and darker in color.

  On the other hand, since the upper surface 20d of the optical sensor substrate 20a faces the upper surface of the top plate 2, the surface faces in the direction in which the light hits through the optical path 40 even though the indoor light is narrow. For this reason, the color of the upper surface 20d is brightened by the indoor light reaching via the optical path 40, and the angle seen from above the top plate 2 is substantially opposite, so the color does not become dark.

  Therefore, the upper surface 20d has a blackish similar color darker than the inner wall 40d of the optical path 40, so that when the upper surface 20d of the optical sensor substrate 20a is viewed from above the top plate 2 via the optical path 40, The upper surface 20d of the optical sensor substrate 20a becomes inconspicuous with respect to the color of the lower portion 40b of the inner wall 40a of the optical path 40 that is far from the plate 2.

  According to the above embodiment, when viewed from above the top plate 2 through the optical path 40, the optical sensor substrate 20a on which the thermopile 20b is mounted can be made inconspicuous and the design can be improved.

In particular, the top plate 2 made of colorless and transparent borosilicate glass made of non-crystallized glass can be used by using a heating coil for all heating means without using a radiant heater as the heating means arranged below the top plate 2. When using, the effect is great.

DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Top plate, 3 ... Top plate frame, 40 ... Optical path, 40a ... Inner wall,
DESCRIPTION OF SYMBOLS 20 ... Optical sensor unit, 20a ... Optical sensor board | substrate, 20b ... Thermopile, 20d ... Upper surface, 6 ... Grill heating means, 10 ... Front operation part, 11 ... Power-off / on switch, 12 ... Upper surface display part, 300 ... Heated 307 ... control means, 308 ... filter means, 302 ... heater, 303 ... heater control circuit, 334,335,336 ... pan position display unit, 324,325,326 ... heating coil, 304,305,306 ... inverter circuit

Claims (1)

A top plate for placing an object to be heated;
A heating coil disposed below the top plate for heating the object to be heated;
An inverter circuit for supplying power to the heating coil;
An optical sensor unit provided below the top plate and provided with a thermopile for detecting infrared rays emitted from the object to be heated and a photosensor substrate on which the thermopile is mounted;
Control means for controlling the heating power of the heating coil based on the output signal of the optical sensor unit;
A cylindrical optical path that is arranged below the top plate and guides infrared rays emitted from the object to be heated to the thermopile,
An induction heating cooker characterized in that the inner wall of the optical path is black, and the upper surface of the photosensor substrate has a similar black color similar to the inner wall of the optical path.