JPH0116970Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-frequency heating device that automatically determines the size of food and cooks it.

With conventional high-frequency heating devices, users individually determine the size of the food and set the heating time and other settings based on their intuition, resulting in many settings errors and a high possibility of cooking failure.

The present invention automatically determines the size of food to prevent cooking failures. Further, the heating time and the like can be set according to not only the size of the food but also the type of food.

For this purpose, the present invention provides a high frequency heating device having the configuration shown in FIG.

That is, in a high-frequency heating device that heats food placed on the turntable while rotating the turntable, the turntable is placed on the heating chamber top plate facing the turntable from the center of the turntable to the outer periphery. A plurality of light emitting elements 3 are provided in the radial direction of
(A to N) and a light receiving element (A to N), and a light emitting element drive that repeatedly causes each light emitting element (A to N) to emit light in response to a heating start input signal. means B, and a light receiving element 4 (A~
N) or a counting means C that counts the output signals of the light receiving elements (A to N) into which the light reflected by the turntable is incident, and the above-mentioned "relationship data between the counted value and the size of the food" stored in advance. A size determining means D that compares the output of the counting means C and determines the size of the food; and a control signal generating means E that supplies a heating control signal to the heating means F according to the determined size of the food.
A high-frequency heating device is constructed from and.

The determining means D can also determine the size of the food by inputting the type of food and switching the "relationship data between the count value and the size of the food" in accordance with the type of food.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Fig. 1 is a schematic front view of a heating chamber of a high-frequency heating device showing an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the main part of Fig. 1, and Fig. 3 is a main part of the embodiment of the invention. It is an electrical circuit diagram.

In the figure, 1 indicates a plurality of sets of light emitting elements 3 on a top plate 2.
A heating chamber is formed by arranging a light receiving element 4 and a tray 6 which is rotated by a motor 5 at the bottom. The light emitting element 3 and the light receiving element 4 are respectively arranged in a radio wave leak prevention tube 7 provided on the top surface of the heating chamber 1, and five sets are provided at approximately equal intervals from the center of the top surface 2 toward the periphery. It is being 8 is food placed on the tray 6. 9 is an oscillator, and 10 is the output of this oscillator 9 which is connected to the light emitting element 3.
A, 3B, 3C, 3D drive transistors 11,
This is a multiplexer that sequentially switches and outputs the bases of 11, . 12 is the light emitting element 3, 3,...
Light receiving elements 4A, 4B, which receive light incident on the
A counter circuit 13 counts output signals from 4C and 4D, a CPU 13 performs calculations of the counter circuit 12, and a microprocessor consisting of RAM, ROM, etc. that stores various measurement data for each type of food 8 in advance. , 14 is an NPN transistor whose collector side is connected to a control relay 17 having a relay contact 16 for controlling a high frequency oscillator 15 that drives a magnetron (not shown).

Next, the operation of the embodiment of the present invention having the above configuration will be explained.

First, when the food 8 is placed on the tray 6 of the heating chamber 1 and a heating start switch (not shown) is pressed, the high frequency oscillator 15 starts to be energized, and the light emitting element 3 shown in FIG. A DC power supply _VDD is supplied to the light receiving element 4, the oscillator 9, the multiplexer 10, the counter circuit and the CPU 13, and the food 8 and the tray 6 are irradiated from the light emitting element 3. By the way, if the food 8 has the shape shown in FIG. 8 and is reflected, but some of it is absorbed by the food 8, so the amount of reflected light is considerably reduced. On the other hand, other light emitting elements 3
Since the light emitted from C, 3D, and 3E directly hits the tray 6, if the surface of the tray is given a glossy finish, most of the light reflected from the tray surface will return to the light receiving elements 4C, 4D, and 4E. come. The light emitting elements 3A, 3B, 3C, 3D, and 3E are sequentially driven by switching the output of the oscillator 9 by a multiplexer 10, and irradiate the food 8 with light while rotating the tray 6. Then, the counter circuit 12 causes the light receiving elements 4A, 4 to
The number of lights reflected by B, 4C, 4D, and 4E is counted, and the microprocessor 10 performs comparison calculations with measurement data stored in advance.
Set a predetermined heating time.

On the other hand, a magnetron (not shown) is activated by the high frequency oscillator 15 to perform microwave heating, but as described above, when the heating time set by the microprocessor 10 has elapsed,
A high level signal is output to the base of the NPN transistor 14 and the control relay 17 is turned on, so that the relay contact 16 is opened and the power supply to the high frequency oscillator 15 is stopped.

In this way, it is possible to optically detect the size of the food, set the optimal heating time, and perform automatic cooking.

As explained above, with this invention, the size of the food is automatically measured by simply instructing the type of food and heating start, and high-frequency heating time control suitable for the size of the food is automatically performed, making it easy to use. We can provide high-frequency heating equipment with excellent quality.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of a heating chamber of a high-frequency heating device showing an embodiment of the present invention, Fig. 2 is an enlarged perspective view of the main part of Fig. 1, and Fig. 3 is an electrical main part of the embodiment of the invention. The circuit diagram, FIG. 4, is a functional block diagram of the present invention. 1... Heating chamber, 2... Top plate, 3A, 3B, 3
C, 3D...Light emitting element, 4A, 4B, 4C, 4D
... Light receiving element, 8 ... Food, 9 ... Oscillator, 10
...Multiplexer, 12 ...Counter circuit, 1
3...CPU, 15...High frequency oscillator.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a high-frequency heating device that heats food placed on a turntable while rotating the turntable, a heating chamber top plate facing the turntable is provided with a heating chamber from the center of the turntable. A plurality of photocouplers are provided in the radial direction of the turntable around the outer circumference and are composed of a light emitting element and a light receiving element, and a light emitting element that causes each light emitting element to emit light repeatedly in sequence in response to a heating start input signal. a driving means; a counting means for counting output signals of a light receiving element receiving light reflected by the food or a light receiving element receiving light reflected by a turntable; a size determining means that compares the output of the counting means with the related data and determines the size of the food; and a control signal generator that supplies a heating control signal to the heating means according to the determined size of the food. A high-frequency heating device comprising means and. 2 The above determination means, by inputting the type of food,
The high-frequency heating device according to claim 1, characterized in that the size of the food is determined by switching "relationship data between the count value and the size of the food" in accordance with the type of food.