JP2708889B2 - Cooking device - Google Patents

Description

The present invention relates to a cooker that knows food temperature by detecting infrared rays from food and controls heating.

(B) Conventional technology Japanese Patent Publication No. 56-42808 discloses that infrared light from food is led out of an infrared lead-out opening formed in a wall of a heating chamber and then intermittently driven by a motor-driven chopper means. There is disclosed a cooker that has a configuration that detects the food temperature based on the temperature signal output by the infrared detection means and performs heating control. Further, in such a cooking device, a shutter driven by a solenoid is separately provided, and the infrared radiation opening is closed by the shutter when it is not necessary to know the food temperature. The contamination of the infrared detecting means and the like due to the oil droplets and the like reaching the outside of the heating chamber through the opening is suppressed as much as possible. Alternatively, a configuration is also shown in which the chopper means is used as a means for suppressing such contamination, and the chopper means is stopped at a position at which the infrared lead-out opening is closed when it is not necessary to know the food temperature.

However, when the opening is opened and closed by the shutter driven by the solenoid as in the former case, an unpleasant loud impact sound is generated when the shutter is driven. In addition, the solenoid is generally driven by a direct current in consideration of the occurrence of a growl when driven by an alternating current. However, in this case, a direct current power supply circuit is required and the cost is increased. Further, when the opening is continuously opened or closed by the shutter, the solenoid must be continuously driven, which increases the power consumption. Further, the above-mentioned chopper means is driven even when it is not necessary to know the food temperature, and in this respect also, the power consumption increases.

On the other hand, in the configuration in which the opening is opened and closed by the chopper means, as in the latter, the chopper means normally performs the infrared intermittent operation at several Hz to several tens of Hz and has a relatively high rotation speed, so that the chopper means is used when the opening is closed. It is difficult to instantaneously and reliably stop at the opening and closing position.

(C) Problems to be Solved by the Invention The present invention is to provide an inexpensive, impulsive sound and groaning-free, low power consumption state, and to reliably close the infrared outlet when there is no need to know the food temperature. It is intended to obtain a cooker that can perform cooking.

(D) Means for Solving the Problems The cooking device of the present invention has a heating chamber in which food is arranged, and an infrared radiation opening formed in a wall surface of the heating chamber and for guiding infrared light from the food to the outside of the heating chamber. And chopper means for intermittently transmitting the infrared light led out through the opening, an infrared detection unit for detecting the infrared light intermittently output by the chopper means and outputting a heating control temperature signal, A rotating body that is located between the opening and the opening and closing the opening, an AC motor that rotates the rotating body, and detects a rotational position of the rotating body, and based on the opening of the opening by the rotating body, And a position detecting means for outputting a chopper drivable signal enabling driving of the chopper means.

(E) Function When it is not necessary to know the food temperature, the infrared lead-out opening is closed by an AC motor driven rotating body provided in addition to the chopper means. Further, the chopper means is driven based on the opening of the infrared outlet.

(F) Embodiment FIGS. 1 and 2 show the structure of a microwave oven according to an embodiment of the present invention. 1 is a heating chamber in which the food 2 is arranged, 3 is a magnetron that supplies a microwave for heating the food 2 in the heating chamber, 4 is formed on the upper wall 5 of the heating chamber 1, An infrared radiation opening for letting infrared radiation out of the heating chamber 1; an infrared detection unit or infrared sensor 6 disposed above the opening; and a chopper 7 for intermittently transmitting infrared light from the food 2 introduced through the opening 4. In the chopper means, reference numeral 8 denotes a rectangular plate rotatably supported by a support shaft 9 and one end of which faces the sensor 6;
Is a permanent magnet fixed to the other end of the rectangular plate, and 11 is an electromagnet facing the permanent magnet. Reference numeral 12 denotes a storage box in which the sensor 6 and the chopper means 7 are built. Reference numeral 13 denotes a rotating disk located between the opening 4 and the sensor 6, and the disk has four small holes 14 at 90-degree intervals. , And four projections 15, 45 at positions offset from the small holes 14, 14, ... by 45 degrees.
15, ... Reference numeral 16 denotes an AC geared motor that rotates the rotating body 13, and the driving torque of the motor is large. The motor rotates at 5 rpm when the power frequency is 50 Hz,
At that time, it is selected to be 6 rpm. The rotating disk 13 is rotated by the motor, and the opening 4 is opened when any of the small holes 14 is positioned immediately above the opening 4. When the small holes 14, 14,... Come off from just above the opening 4, the opening 4 is closed by the rotating disk 13. Reference numeral 17 denotes a position detection switch arranged around the rotating disk 13, and the switch is turned on by the projections 15, 15,... When the rotating disk 13 rotates so that the opening 4 is opened. You.

FIG. 3 shows the circuit of the microwave oven. 18 is a microcomputer for controlling the microwave oven, 19 is a keyboard for setting heating conditions such as heating temperature in the computer, 20 is a display unit for displaying remaining heating time and the like, and 21 includes the magnetron 3 described above. A magnetron drive circuit, 22 is a relay coil connected in series with a transistor 23 that is turned on and off by the computer 18, and 24 is a relay switch that is turned on when the coil is excited. The switch is connected in series with the motor 16. The switch 24 and the motor 16 are connected to an AC power supply 25. Reference numeral 26 denotes a diode for inputting a 0-level signal output through the switch 17 to the computer 18 when the position detection switch 17 is turned on with the opening of the opening 4;
Consisting of two transistors 28, 28 and a knot circuit 29, etc.
An electromagnet drive circuit that drives the electromagnet 11
Reference numeral 11 includes first and second electromagnet portions 11a and 11b. Then, the electromagnet drive circuit 27 is switched as described above.
A 0-level signal output via 17 is input as a chopper drive enable signal, and a 3 Hz pulse signal is input from the computer 18. At this time, when the 3 Hz signal is input under the input of the chopper drive enable signal, the 3 Hz signal is input.
According to the signal, the first and second electromagnet portions 11 of the electromagnet 11
a, 11b are alternately activated, the polarity of the electromagnet 11 is reversed, the permanent magnet 10 is affected accordingly, and the rectangular plate 8 makes a periodic reversing rotation about the support shaft 9. . Then, the infrared light derived from the opening 4 is periodically interrupted by one end of the rectangular plate 8. The intermittent infrared light is input to the sensor 6, and the sensor 6 outputs a heating control temperature signal. An amplifier 30 amplifies the temperature signal and inputs the amplified signal to the computer 18.

The operation of the microwave oven will be described with reference to the timing chart of FIG. 4. Normally, the opening 4 is closed by the rotating disk 13.

Then, when a heating temperature is set by the keyboard 19 and a heating start operation is performed, the magnetron drive circuit 21 is driven by the computer 18 to start microwave heating.
At the same time, the transistor 18 is turned on by the computer 18, the relay coil 22 is excited, the relay switch 24 is turned on, AC power is applied to the AC geared motor 16, and the motor 16 is started, whereby the rotating Board 13
Starts to rotate. By this rotation, the opening 4 is opened when one of the small holes 14, 14,... Comes directly above the opening 4, and at this time, the switch 17 is turned on by one of the projections 15, 15,. I do. When such ON is performed, a zero level signal is input from the diode 26 to the computer 18, and
The computer 18 determines that the opening 4 has been opened, the transistor 18 is turned off by the computer 18, and the rotating disk 13 stops rotating. Thereafter, the opening of the opening 4 is maintained. Further, the 0 level signal is input to the electromagnet drive circuit 27 as a chopper drive enable signal, and at this time, a 3 Hz signal is input from the computer 18 to the circuit 27, so that the signal is derived from the opening 4 as described above. Infrared radiation begins to be intermittent. By such an interruption, a temperature signal for heating control is output from the sensor 6, and this signal is amplified and input to the computer 18.

Based on the input of the temperature signal, the computer 18 compares the food temperature with the set heating temperature, and thereafter, when the food temperature reaches the set heating temperature, the computer 18 stops driving the magnetron drive circuit 21 and the microwave Heating ends. Then, with the end, the rotating disk 13 starts to rotate again, and this rotation is caused by the rotation of the rotating disk 13 by 1/8.
This is performed for the time T required for rotation. When the time T elapses, the rotation of the rotating disk 13 is stopped. At this time, the opening 4 is closed by the rotating disk 13 because the small holes 14, 14,.

Also, when the above 1/8 turn is made, the projection 15
As a result, the position detection switch 17 is turned off, and based on this, the 0 level signal is not input to the electromagnet drive circuit 27 as a chopper drive enable signal, and the intermittent infrared light is terminated.

In the above configuration, the opening and closing of the opening 4 is performed by the rotating disk 13 driven by the AC geared motor 16, so that there is no generation of an impact sound or the like as in the case of being driven by a solenoid. There is no need for a DC power supply circuit used for driving, and the cost is not increased. Further, once the opening 4 is opened or closed, the opening 4 is kept open or closed even after no AC power is applied to the motor 16, so that the power consumption does not increase. Further, the electromagnet 11 of the chopper means 7 is used to interrupt the infrared rays.
Is driven only when a chopper drive enable signal is generated based on the opening of the opening 4, and the power consumption related to the intermittent infrared rays does not undesirably increase. Further, the opening and closing of the opening 4 is performed by the rotating disk 13 and is not performed by the chopper means 7 for interrupting the infrared rays. Therefore, when the opening 4 is closed, the chopper using the chopper means 7 which moves at a relatively high speed is used. There is no need to stop the means 7 to close the opening 4, and the closing of the opening 4 can be instantaneously and reliably stopped.

(G) Effects of the Invention According to the present invention, the opening and closing of the infrared lead-out opening is inexpensive,
It is possible to obtain a practical cooker which can be performed in a state in which power consumption is suppressed without generating an impact sound or the like, and which can reliably close the infrared lead-out opening when there is no need to know the food temperature. it can.

[Brief description of the drawings]

1 is a cross-sectional view, FIG. 2 is a plan view of a main part, FIG. 3 is a circuit diagram, and FIG. 4 is a timing chart for explaining operation. 1 ... heating chamber, 4 ... infrared radiation opening, 6 ... infrared sensor, 7 ... chopper means, 13 ... rotating disk, 16 ... AC geared motor, 17 ... position detection switch.

Claims (1)

(57) [Claims] 1. A heating chamber in which food is disposed, an infrared radiation opening formed in a wall surface of the heating chamber, and for guiding infrared light from the food out of the heating chamber, and the infrared radiation led through the opening. A chopper means for intermittently intermittently interposing the infrared light, an infrared ray detecting section for detecting the infrared ray intermittently and outputting a temperature signal for heating control, and being located between the infrared ray detecting section and the opening, for opening and closing the opening. Rotating body,
An AC motor for rotating the rotator, and a position detector for detecting a rotational position of the rotator and outputting a chopper drivable signal for enabling the chopper means to be driven based on opening of the opening by the rotator. Cooker consisting of means.