JPH01246785A - Cooking apparatus - Google Patents

Abstract

PURPOSE:To enhance the heating efficiency and improve easy-to-handle property at putting in and taking out the food by furnishing a means to light up a lamp with low illuminance at the time of heating, and providing a means to light up the same with high illuminance while the door to the heating chamber is opened. CONSTITUTION:When the door to a heating chamber is opened, a control part 30 senses the door opening through deactuation of a monitoring door switch 22c and actuates relays 33, 34. Actuation of these relays 33, 34 turns on contacts 33a, 34a to light up lamps 11, 12, and inside the heating chamber is illuminated with high illuminance. When food is placed and the door shut, the control part 30 deactuates the relays 33, 34 to put off the lamps 11, 12, and when heating is commenced from an operational part 35, the relay 33 is actuated to light up only the lamp 11 to illuminate inside the chamber with low illuminance. Thus easy-to-handle property at putting in and taking out the food is enhanced while high heating efficiency is kept.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a cooking appliance such as a microwave oven.

(Prior Art) A cooking appliance such as a microwave oven is equipped with a lamp for illuminating the heating room, and the lamp is turned on during heating so that the doneness of the food can be visually checked from outside.

Furthermore, a lamp is lit even when the heating chamber door is opened, making it easier to take food in and out.

(Problem to be Solved by the Invention) However, in an attempt to improve heating efficiency even a little, lamps with low power consumption are used, and the illuminance is insufficient and tends to be dark. (Heating efficiency - output (W) / input (W)
)Xl, 00%).

For this reason, there is a problem in that it is not easy to use, especially when taking food in and out.

This invention was made in view of the above circumstances,
The purpose is to provide a cooking device that can greatly improve the usability of food when putting in and taking out food while ensuring high heating efficiency.

[Structure of the Invention] (Means for Solving the Problems) A means for lighting the lamp at low illuminance during heating, and a means for lighting the lamp at high illumination when the door of the heating chamber is opened are provided.

(Function) By illuminating the heating chamber at low illuminance during heating, food can be visually recognized while ensuring high heating efficiency. When the door is open, the heating chamber is illuminated with high illuminance, making it easier to take food in and out.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a heating chamber, and although not shown, a closing door is pivotally supported in the opening so that it can be opened and closed.

A motor 2 is provided on the back side of the bottom of the heating chamber 1 . A shaft 3 is connected to the rotating shaft of the motor 2, and the shaft 3 is introduced into the heating chamber 1 by passing through the bottom surface.

A turntable 4 is detachably set at the introduction end of the shaft 3. The turntable 4 is used for placing food 5.

A high-frequency radio wave irradiation port 6 is formed on the ceiling surface of the heating chamber 1, and one end of a waveguide 7 is communicated with the irradiation port 6.

A magnetron 8 is provided around the other end of the waveguide 7 , and an antenna 8 a of the magnetron 8 is introduced into the waveguide 7 .

A light passage hole 9 is formed in the upper side of the heating chamber 1, and lamps 11 and 12 are provided outside the light passage hole 9.

The electrical circuit is shown in Figure 1.

Commercial AC power supply 20, fuse 21, first door switch 2
A door monitor switch (short switch) 22c is connected via the 2a1 second door switch 22b.

A fuse 21. is connected to one end of the power supply 20. First door switch 22
a, one end of the primary coil 23a of the high voltage transformer 23 is connected via the relay contact 31a.

The other end of the secondary coil 23a is connected to the other end of the power source 2o via a relay contact 32a and a second door switch 22b.

A secondary coil 23b of the high voltage transformer 23 is connected between the anode and cathode of a magnetron 26 via a half-wave voltage doubler rectifier circuit including a high voltage capacitor 24 and a high voltage diode 25. The anode of the magnetron 26 is grounded, and the heater (cathode) is connected to the secondary coil 23c of the high voltage transformer 23.

A fuse 21. is connected to one end of the power supply 20. First door switch 22
a, one end of the motor 2 is connected via a relay contact 31a. The other end of the motor 2 is connected to the second door switch 22b.
It is connected to the other end of the power supply 20 via. A magnetron cooling fan motor 27 is connected in parallel with the motor 2.

Fuse 21 to power supply 20. One end of the lamp 11 is connected via the relay contact 33a, and the other end of the lamp 11 is connected to the other end of the power source 20.

Fuse 21 to power supply 20. One end of the lamp 12 is connected via the relay contact 33a, and the other end of the lamp 12 is connected to the other end of the power source 20.

On the other hand, a fuse 21 and a step-down transformer 28 are connected to the power supply 20.
The control unit 30 is connected via.

The control section 30 performs overall control of the microwave oven, and is composed of a microcomputer and its peripheral circuits. Then, the control unit 30 has a door switch 22 for monitoring.
d, relays 31, 32, 33, 34, and operation section 35 are connected.

Next, the operation of the above configuration will be explained with reference to FIG.

The door of the heating chamber 1 is opened and the food 5 is placed on the turntable 4.

At this time, the control unit 30 detects the opening of the door by turning off the monitor door switch 22, and energizes the relays 33 and 34. When relays 33.34 are energized, contacts 33a
+34a is turned on, and lamps 11 and 12 are both lit.

When the lamps 11 and 12 are turned on, the inside of the heating chamber 1 is illuminated with high illuminance "H", making it easier to place the food 5. Furthermore, it becomes easier to check the preparation condition of the food 5 and the condition inside the heating chamber 1, such as the presence or absence of food waste in the heating chamber 1.

When the door is closed, the control unit 3o deenergizes the relays 33 and 34 and turns off the lamps 11 and 12.

(Illuminance “O”).

Then, the heating time and heating output are set using the operation unit 35, and an operation to start heating is performed.

Then, the control section 30 energizes the relays 31 and 32, causing the magnetron 26 to perform an oscillating operation. When the magnetron 26 operates in oscillation, high-frequency radio waves are irradiated into the heating chamber 1, and the food 5 is dielectrically heated.

During this heating, the control unit 30 turns on and off the relay 32 with a duty according to the set heating output to control the heating output.

Further, the control unit 30 energizes the relay 33 and the lamp 11
The inside of the heating chamber 1 is illuminated with low illuminance "L" by turning on only the lamp.

That is, the condition of the food 5 can be visually confirmed from the outside. Furthermore, since the illumination is of low illuminance "L2", high heating efficiency can be ensured.

If the door is opened during heating, the door switches 22a, 2
2b is turned off, and the oscillation operation of the magnetron 26 is interrupted.

At this time, the control unit 30 energizes the relay 34 to
2 is added, and the inside of the heating chamber 1 is illuminated with high illuminance g Hs. Therefore, you can directly check the doneness of food 5,
Alternatively, it becomes easier to modify the food 5.

When the door is closed, the control unit 30 restarts heating, deenergizes the relay 34, turns off the lamp 12, and turns off the heating chamber 1.
The internal illumination is returned to the low illuminance "L" of only the lamp 11.

On the other hand, the control unit 30 counts the passage of time, and when the count value reaches t minutes before the set heating time, it energizes the relay 34, turns on the lamp 12, and sets the high illuminance to "H".
get.

This not only increases the visibility of the finished food 5 from the outside, but also serves as a notification that the end of heating is near.

When the count value reaches the set heating time, the control unit 30 deenergizes the relays 31 and 32 and stops the oscillation operation of the magnetron 26. However, the relays 33 and 34 continue to be energized, and the high-intensity "Ho" illumination is continued to facilitate the removal of the food 5.

Then, when the door is opened and closed to take out the food 5, the control unit 30 deenergizes the relays 33 and 34,
Turn off lamps 11 and 12.

In this way, during heating, the inside of the heating chamber 1 is kept at low illuminance "L".

The food 5 can be visually recognized while ensuring high heating efficiency. Also, when the door is open, heating chamber 1
By illuminating the interior with high-intensity "Ho" lighting, ease of use when loading and unloading food is greatly improved.

In the above embodiment, two lamps 11 and 12 are used to change the illuminance, but the number of lamps is not limited. Alternatively, the number of lamps may be one, and the illuminance may be changed by adjusting the voltage applied to the lamp.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist.

[Effects of the Invention] As described above, according to the present invention, there is provided a means for lighting the lamp at low illuminance during heating and a means for lighting the lamp at high illuminance when the door of the heating chamber is opened. It is possible to provide a cooking device that can greatly improve usability when taking food in and out while ensuring heating efficiency.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an electric circuit in one embodiment of the present invention, FIG. 2 is a diagram showing the configuration of the heating chamber and its surrounding area in the same embodiment, and FIG. 3 is an explanation of the operation of the same embodiment. This is a time chart for 1... Heating chamber, 8... Magnetron, 11.12.
...Lamp, 22a...First door switch, 22b.
...Second door switch, 22C...Door monitor switch, 23d...Door switch for monitor, 30...Control unit. Applicant's representative Patent attorney Takehiko Suzue 1'

Claims (1)

[Claims] A cooking appliance equipped with a lamp for illuminating the inside of a heating chamber, characterized in that it is provided with means for lighting the lamp at low illuminance during heating, and means for lighting the lamp at high illuminance when the door of the heating chamber is opened. Cooking device.