JPS60171318A - Cooking apparatus with infrared ray sensor - Google Patents

Abstract

PURPOSE:To make it possible to detect the temperature with respect to food to be cooked placed on a turntable at a position deviated from its center by providing holes for measuring the temperatures of the surfaces of a plurality of food being cooked at the ceiling portion of a heating chamber, further providing an infrared ray detector between the ceiling part and an outer shell so as to make it possible to move an infrared detecting part to any of positions of holes. CONSTITUTION:An infrared ray detector 11-b having an infrared ray sensor 11-a at the outside of the ceiling part 3-a of a heating chamber 3 is provided. The infrared ray detector 11-b rotates and moves on a horizontal plane horizontal to the ceiling portion 3-a by a motor 12, and provisions are monitored through three holes, for example. A microcomputer 18 gradually delivers scanning pulses to output terminals S0-S4 to discriminate which key button has been depressed, and operates the motor 12. As a result, the infrared ray detector can correctly detect the surface temperature of the food under cooking even when the provision is placed on the peripheral edge of the turntable by moving the sensor to a position optimum for detecting the food under cooking.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to automatic sensor cooking in an infrared sensor cooker, and in particular to the sensor I'','/ii4+°
It is related to.

The structure of the conventional example and its problems In the conventional infrared sensor (microwave oven, etc.), for example, the position of the infrared sensor is fixed (Japanese Utility Model Publication No. 57-21903). Or tracking with a servo system (!I', l+Kaisho 56-6979
No. 4 Publication) is known. However, in the former method, the food must be placed within the field of view of the sensor, which makes it inconvenient to use6, and in the turntable method, the food must be placed approximately in the center of the heating chamber. Therefore, in a microwave oven, the original feature of a turntable, which is to remove unevenness caused by non-uniformity of electric field distribution within the heating chamber by the movement of the food, cannot be demonstrated. In the Turncheagle method, the food must be placed off the center of the table before it passes through the strong points of the electric field in the heating chamber and is heated evenly.

On the other hand, the latter method of tracking the food position using a servo motor uses a microcomputer to calculate the position and uses the servo motor to restrict the field of view of the sensor, which is mechanically complex and requires a large amount of time. There were drawbacks. In addition, in order to control cooking by detecting the temperature of food, it is not necessary to monitor it throughout the cooking process; instead, it is necessary to monitor the temperature rise of the food every rotation cycle of the turntable (approximately 10 seconds). It is enough.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a cooking appliance that detects surface temperature at a sufficient frequency for cooking and has an infrared detection device that is structurally simple. purpose.

In order to achieve the object described in Structure of the Invention, the cooking appliance of the present invention has a plurality of holes for measuring food surface temperature in the ceiling part of the heating chamber, and infrared rays are provided between the ceiling part and the outside. It has a detection device, and has a configuration in which the detection part of the infrared detection device can be moved to the plurality of hole positions, and with a single infrared detection device,
Since it is possible to detect red light radiation from food in the heating chamber at multiple locations, temperature detection is now possible even for food placed off-center on the turntable. This eliminates the uneven cooking caused by the non-uniform electric field distribution inherent to the table, and can also detect the surface temperature of food at a distance of 1 meter.

DESCRIPTION OF EMBODIMENTS Hereinafter, an electric oven which is an embodiment of the present invention will be described based on the drawings. .

In FIGS. 1 and 2, microwaves excited by a McNetron VC are guided into a heating chamber 3 by a wave tube 2 and absorbed by the food. In addition, the wind generated by the fan 4 cools the McNetron 1, and then the air guide 5
A part of the wind is guided by the air guide 7.

Enter the heating chamber 3 through the punching 8 on the side of the heating chamber 3,
The heat generated as a result of heating the food is carried, enters the exhaust guide 10 through the punching 9 on the opposite wall of the heating chamber 3, and is exhausted to the outside of the outer shell 6. -! In FIG. 3, an infrared sensor 11 is installed outside the ceiling 3-a of the heating chamber 3.
-a is provided, and an infrared detection device 11-b is provided,
This infrared detection device 11-b is rotated by a motor 12 on a plane parallel to the ceiling 3-a, and
Look into the food 14 through one of the holes 13 made in the
It is configured to detect its surface temperature.

FIG. 4 shows the positional relationship between the hole made in the ceiling 3-a and the infrared sensor device. As shown in FIG.
b. The food is monitored through the hole 13-0 at the intermediate point and three holes. FIG. 4tb+ shows how the infrared sensor 11-a monitors the food 14 through the hole 13-c.

The rotation control mechanism of the infrared detection device 11-b is shown in FIG.
-b is absent in several cases, and the microswitches 15-a, 15-b, and 15-C are sequentially turned on according to the rotation angle. Infrared rays - Hinsa 11-a is hole 13
-c indicates the state where it is located on microswitch 15-aktON.

The micro switch 15-b is in the FF position, and the microphone υ switch 15-c is in the ON state. Microswitch 15-a when infrared sensor 11-a is located above hole 13-a.

15-b, 15-... are all ON, infrared sensor 11
When -a is 1fft in hole 13-bJ2, micro switch 15-a is OFF, microphone lff switch 1
s-bI'1oFr, microswitch 15-c is ON
O-shaped BK position. Also, when cooking without using the infrared sensor 11-a, all the microswitches are turned off, and the holes 13-a, 13-b, 13-c
An infrared detection device is located at a position where all of the areas are covered. Micro switch 15'-c is heating control @ infrared sensor 11-a! It is turned on when it is used, and turned off when it is not in use. Holes 13-a, 13-b,
Among the holes 13-c, the holes whose axes are not aligned with the infrared sensor 11-a are closed by the peripheral edge 16-a of the lens barrel 16.

Next, a means for detecting that food has come directly below the infrared sensor 11-a will be described.

No. 61.1 (al (bJ is a diagram showing the front and back sides of Turnchieve/l/290.Turn tape) The surface of V29 has circular markings 2 in 3 places (center, periphery, middle).
9-a is the drawn belly, and the corresponding point on the back side is 7.
"l'7t, the magnetic material 29-b is embedded!, it is male. This turntable 29 has a turntable motor 28
It fits with the shaft 28-a of. A magnetically sensitive element such as a Hall element 29 for detecting the f6 substance is installed outside the bottom of the heating chamber 3, so that the rotation angle of the turntable 29 can be detected. Note that position detection can also be realized by using a non-contact position detection element such as an ultrasonic sensor, and in such a case, a detection device using the above mechanism is unnecessary.

Next, FIG. 7 shows an embodiment of the control circuit according to the present invention.

The microcomputer 18 (hereinafter referred to as microcomputer) sends out the scanning pulse shown in FIG. It is determined which input terminal r of I3 is receiving the high signal, it is determined which key has been pressed, and the corresponding numbers and characters are displayed on the display section 19. At this time, the scanning pulse specifies the display digit, and segment data of numbers and characters is sent to the display section 19 from the parallel output terminals DO to D7.

The display section 19 is shown in FIG.

Here, when a pulse is output to the output terminal SO, the input terminal l
311 It was detected that the High signal was present.
For j, the middle button 18-a detects that a High signal is present at the I2 terminal (for 1, i, the middle button 18-a
-b detects that a High signal is present at terminal 11, detects that the peripheral button 18-c has been pressed, and then moves the motor 12 to the position indicated by the button 11'C.
By moving, the infrared detection device 11-b is moved. Micro switch 1 is used to stop Chiyo 12.
The signals from 5-a, 16-b, 15-c are
The microcomputer 18 has individual input terminals R4+ R6+ Re
Judgment is made by reading the signal voltage. FIG. 10 shows a part of the flowchart. In FIG. 10, for example, if peripheral key 18-0 is pressed n, first 16
When -c is OFF, rotate the motor 12 counterclockwise until 15-0 turns ON (A). 15 when 15-c is ON
- It is determined whether or not a is OFF, and if it is OFF, it is stopped (mouth). - When the force 15-a is ON, the microcomputer 18 executes a sequence such as H0 or above that rotates the motor 12 clockwise until the force 15-a is turned OFF, and the infrared detection device 11- is placed at a predetermined location. can be moved to. Also, when heating is finished, it can be automatically moved to a position where all holes are closed.

In FIG. 7, the individual output terminal R3 of the microcomputer 18 is connected to the buzzer 2 which generates an audible sound when a key is pressed or when cooking is completed.
This is a terminal that outputs a buzzer signal to 0. R2 is 100V
R1 is an end r' that controls the main relay switch 21 that opens and closes the U path, and a relay switch 23 that controls the on/off of energization of the magnet 1-11 circuit 22 through the driver IC 25. Also, the fan motor 27 is the fan 4
The motor that monitors this, the turntable motor 28, is made by jJI.
I This is a rotor for driving the turntable 29 that rotates the food in the heat chamber 3 and changes the radio wave distribution.

R4+ R5+ R6 is 1 switch 1 microphone
The information of 5-a, 15b, and 15-c is the terminal for human power.High human power is displayed for bacteria when the switch is ON, and low human power is displayed when the switch is OFF.

R7+R8 is an end r- which is an individual output terminal and controls the motor 120 rotations via the drive circuit 12-c.

R9 is a terminal through which a pulse signal from the Hall element 29-c is transmitted manually.

In synchronization with the signal input to the R9 terminal, the signal from the infrared temperature sensor 11-C converts the detection signal into the amplifier circuit 11-C.
After being amplified by d, the signal is input to the N terminal of the microcomputer 18.

The input voltage of the A/D terminal is analog-digital converted in the microcomputer 18, and after calculation, the temperature is determined.

According to this embodiment, even if food is placed somewhere other than the center of the turntable, it can be detected by moving the infrared detector to the optimal position for detecting the food. This makes it possible to improve the uniform heating performance inherent to Turnchive) and detect food surface temperature.

In addition, the multiple holes in the ceiling are closed except for those used to measure the temperature of food, so the outside of the ceiling may be contaminated by debris from the food being heated. By covering all the holes when the infrared sensor is not in use, it is possible to prevent accidents such as foreign objects falling 1 meter through the holes and damaging the equipment.

Furthermore, by employing means for detecting the position of food, the position of the sensor can be automatically moved.

Furthermore, even without using the automatic position displacement mechanism as described above, the sensor position can be moved by placing a food position mark on the turntable and specifying the food position from the outside using a keyboard. It has advantages such as being able to realize accurate infrared detection with four components.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) Even when the food is placed on the periphery of the turntable, the temperature of the food can be accurately detected.

+21, CIL-- By moving the sensor, information at multiple points can be detected.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a microwave oven which is an embodiment of the present invention, Fig. 2 is a plan view of the microwave oven with the outside completely removed, and Fig. 3 is an electronic microwave oven according to the present invention. A system configuration diagram of the range, Fig. 4 (al (bl is a top view and side view showing the outline of the sensor moving device, Fig. 5 ta + lb) shows the switch equipment, a two-sided view and a side sectional view, Fig. 6 ( alt
bl is a perspective view of the front surface and a plan view of the back surface of the turntable, FIG. 7 is a circuit diagram of a control circuit according to an embodiment of the present invention, FIG. 8 is a diagram showing a null pulse of a microcomputer, and FIG. 9 10 is a block diagram of an embodiment of the display section.
The figure is a control flowchart 1- of the motor for moving the sensor section. 1... Magnetron (heating means), 3...
... Heating chamber, 11-b ... Infrared detection device, 1
2... Motor, 13... Hole, 16-a.
...Peripheral part (closing means), 29-a...
Magnetic material, 29-c...Hall element (position detection means). Fig. 1 Fig. 2 Fig. 31!1 Fig. 4 Fig. 5 Fig. 6 Fig. 29-Haruka Fig. 8 B8 Leap

Claims (3)

[Claims] (1) A heating chamber in which food is placed, a means for heating the food in the heating chamber, a plurality of holes for observing food surface temperatures provided in the ceiling of the heating chamber, and an infrared ray provided outside the ceiling. A cooking appliance with an infrared sensor, comprising a detection device and means for moving a signal detection part of the infrared detection device to the hole position. (2) The means for moving the infrared detecting device is provided with means for closing holes other than the hole used for observation among the plurality of holes for observing food surface temperature. Cooker with sensor. (3) The cooking appliance with an infrared sensor according to claim 2, wherein the means for moving the infrared sensor includes means for closing all observation holes when cooking is not performed using the infrared sensor. (4) The means for moving the infrared detecting device is configured to move the infrared detecting section to the corresponding observation hole based on detection information from the means for detecting the position of the food in the heating chamber. : [I-Kisen's infrared sensor cooker.