JPS59194382A - Electronic range - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave oven equipped with a wireless temperature probe that wirelessly transmits and receives temperature data of a heated object and automates cooking control.

In conventional microwave ovens, a temperature probe is inserted into the object to be heated, and a transmission line for transmitting the signal of the temperature probe is attached to the temperature probe.

A method was used in which signals were sent to the control circuit via the transmission line. Heating control using such a wired probe has the advantage that the internal temperature of the object to be heated can be accurately captured and heating can still be controlled at a set temperature desired by the user. However, 'FJ1' had the disadvantage that it could not be applied when rotating the heated object using a turntable because of the need to uniformly heat the heated object.

A wireless temperature probe has been proposed as one of the methods to overcome this drawback. In this method, temperature data of the object to be heated is transmitted from a probe using radio waves, ultrasonic waves, or light as a medium, and is received outside the heating chamber to perform heating control. With this method, a turntable can also be used. Further, the probe has a thermistor sealed at the tip of the glove as a temperature detection element, detects changes in the temperature of the object to be heated as changes in resistance value, and sends a signal by converting the change in resistance value into a change in voltage or a change in oscillation frequency. Batteries can be considered as a power source for the electronic circuit of this transmission (g), but batteries have a limited lifespan and must be replaced. Instead of using batteries, the microwaves inside the heating chamber are received by an antenna.

It can be rectified with a diode and used as a power source.

This is a non-important issue in the practical application of wireless temperature probes.

However, in wireless temperature gloves, which receive microwaves with an antenna and use them as a power source for electronic circuits, and transmit temperature changes of the heated object as a signal, the microwaves may damage electronic circuit components or send signals. The problem was that it caused microwave interference in the circuit, making it impossible to transmit accurately.

The present invention solves the above-mentioned problems, and aims to provide a wireless temperature probe that can receive microwaves with an antenna and use the energy as a power source to reliably transmit temperature changes of a heated object as a signal.

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

In FIG. 1, 1 is the microwave oven main body.

The object to be heated 16 is a heating chamber, and 4 is a door. 5 is a turntable for rotating the object to be heated.

6 is a wireless temperature probe. The wireless temperature globe 6 is inserted into the object to be heated 2 and transmits temperature data of the object to be heated. The medium for transmitting the signal is ultrasound. The operation of this device is as follows: (1) The object to be heated 2 is placed on the turntable 5, the wireless temperature probe 6 is inserted, and the door 4 is closed. ■The user sets the desired temperature on the control panel and presses the start button. (2) When high frequency waves enter the heating chamber 6, the object 2 to be heated is heated, and temperature data is transmitted from the probe 6. ■When the set temperature and the temperature detected by the probe match, the control circuit operates, the magnetron power supply circuit is turned off, and cooking is complete.

Next, the main body of the wireless temperature glove is shown in FIG. 2?
is a metal cylindrical body with a built-in power supply and transmission circuit (
(hereinafter referred to as a cylindrical body) 8 is a protrusion with a built-in thermistor, which is inserted into the object to be heated 2. 66
is a lid housing an antenna that receives microwaves and an ultrasonic transmitting element.

The power source for the transmitting section uses microwaves from the antenna, which are rectified by a diode.

FIG. 6 shows a block diagram of its configuration. 10 is a power supply unit, 12 is a thermistor, 11 is an oscillation unit that converts the resistance value change of the thermistor 12 that changes with temperature into an oscillation frequency change, 13 is a transmitter unit that transmits the oscillation frequency, and 14 is an ultrasonic wave generator. It is a transmitting element.

FIG. 4 shows a block diagram of the receiving system. The wireless temperature globe 6 also transmits an oscillation frequency (period T) determined by the temperature, that is, the resistance value of the thermistor 12, using ultrasonic waves as a medium, and uses an ultrasonic receiving element 15 installed outside the heating chamber via a punched hole or meso/yu. Receive. The received signal is amplified by an amplifier circuit 16, rectified, and input to a waveform shaper 17 using a comparator. The above waveform-shaped rectangular wave (period T) is sent to the I10 interface circuit 18.
The microcomputer 19 reads the period T, performs arithmetic processing, and detects the temperature of the heated object 2.

The microcomputer 19 controls the power supply 20 of the magnetron 21.

The structure of the wireless temperature probe having the above configuration will be described in detail along with its functions.

Figure 5 is a cross-sectional view of the wireless temperature probe, and Figure 6 is a cross-sectional view of the wireless temperature probe.
The figure is a sectional view of a support body equipped with a power supply section, a transmitter section, etc. Further, FIG. 7 is a structural diagram of the support body, and FIG. 8 is a structural diagram of the joint portion between the cylindrical body and the protrusion. This will be explained below using FIGS. 5 to 8. The cylindrical body 22 containing the power supply unit 107, the oscillating unit 11, and the transmitting unit 13 is constructed of a metal cylindrical body with an inner diameter equal to or less than the cutoff. The cylindrical body 22 is formed into a bottomed cylindrical shape by press working, and has a protrusion 8 in which a thermistor 12 is enclosed in the bottom 24 of the cylindrical body 22 . The protrusion 8 is made of a metal pipe with an inner diameter smaller than that of the cylindrical body 22, and houses the thermistor 12 and its lead wire, and the tip 26 is sealed with a cap with a sharp tip. It has become. The cylindrical body 22 and its metal pipe are joined by forming a collar 23 on the bottom 24 of the cylindrical body by burring.

Both are integrated by pressure welding.

Also, to improve the watertightness of this area, a recon-based filler is applied. To further complete the process, 12 protrusions 8 longer than the length 11 of the flange 2 are fitted and joined with solder 44. By this simple measure, microwave penetration from this part can be completely prevented and the electronic circuit components stabilized. 27 is a support body that holds the power supply section 101, the oscillation section 11, and the transmission section 1, and this support body 27 holds the antenna 28. A lid body 66 that holds the ultrasonic transmitting element 14 and closes the opening of the cylindrical body 22 is integrated.

The lid 63 is a metal molded product having a shape in which the seven range pieces 64 fit into the cylindrical body 22, and the filter and flange pieces 34 and the cylindrical body 22 are integrated by pressure welding.

Further, the lid body 66 and the support body 27 are integrated by welding.

An antenna 28 is attached to the lid 33 via a dielectric filter 6. The anti-two 28 is constructed with a wire diameter of 0.5I25 and a length of about 10 or so, and is arranged coaxially with the hole 65 of the lid 66 to form a post antenna for electric field coupling.

The ultrasonic transmitting element 14 is surrounded by a metal casing, and is attached to a hole 37 formed in the lid 33, and the casing and the lid 66 are connected to a metal contact portion 38.
is formed to prevent radio waves from entering the inside of the cylindrical body 22 from the part where the ultrasonic transmitting element 14 is attached.

The radio waves fed from the antenna 28 are connected to the strip line 29
through the diode 30 and rectify it to direct current.

Penetrating condenser 42 attached to hole 38 of support body 27
The high-frequency components are removed by using the power source, and the result is used as a power source for the transmitter circuit. These constitute the power supply section 10.

A strip line 29 attached to the support 27. The portion of the diode 60 and the antenna 28 on the strip line side is surrounded by a barrier 69. This barrier 39 is a metal molded product, and has a protrusion 41 that engages with a hole 40 of the support 27. The hole 40 and the protrusion 41 are engaged to block microwaves and prevent the strip line 29 from becoming a tube. To prevent damage to microwaves radiated into the shaped body 22. Barrier 3
One end of 9 is in close contact with the lid 33, and the other end is in close contact with the bottom 24 of the cylindrical body 22.

The effect of removing microwave radiation into the cylindrical body 22 is promoted.

On the other hand, a dielectric cap 46 is attached to the outside of the lid 33. The dielectric cap 43 surrounds the end of the cylindrical body 22 and serves to prevent hands from getting scratched at the end.

Further, the ultrasonic transmitting element 14. In order to protect the antenna 28 from external forces, the protruding height is larger than the protruding dimension of both antennas.

Since the present invention is configured as described above, it is possible to use a turntable, and since microwaves are received by an antenna and rectified by a diode and used as a power source, batteries are not required. A cylindrical body having a cylindrical body and its lid constitute a power supply unit 7 and an oscillating unit.

The transmitting part and thermistor are enclosed, and the microwaves radiated to the heating element will not enter from any part other than the antenna. It has a simple structure that closes the opening of the 1. It is easy to assemble. In particular, the power supply part is surrounded by a barrier, and the protrusion part is connected through the ridge part, so that the micro- Waves are radiated to the transmitter and oscillator.

It has the advantage that there is no chance of intrusion.

[Brief explanation of the drawing]

Fig. 1 is an external view of a microwave oven using a wireless temperature probe according to an embodiment of the present invention, Fig. 2 is an external view of the main body of the wireless temperature probe, Fig. 6 is a configuration block diagram of the probe, and Fig. 4 is a block diagram of the receiving system, Figure 5 is a cross-sectional view of the wireless temperature probe, and Figure 6 is a cross-sectional view of the wireless temperature probe.
The figure shows the same power supply section. Fig. 7 is an external view of the support without the power supply unit, transmitter, etc. attached, and Fig. 8 is a sectional view of the joint between the protrusion and the boxwood part. It is. 6...Wireless temperature glove, 8...Protrusion. 10...power supply section, 11. oscillation section. 12... Thermistor, 16... Transmission section. 14... Ultrasonic transmitting element, 22... Bottomed cylindrical body. 26・Brim part, 24...Bottom part. 28. Antenna, 29... Strip line. 63... Lid body, 39... Barrier. Figure 1 Figure 3 Figure 4

Claims (1)

[Scope of Claims] A wireless temperature probe that controls the heating of the object by transmitting temperature data of the object by using part of the microwave energy for heating the object as a power source for a transmission circuit. In a microwave oven, a metal cylinder with a bottom (
2), the protrusion (8) and the lid body (G) connected via the brim (C) of the bottom (C) constitute an outer shell, and the protrusion (8) is equipped with a thermistor α. , the bottomed cylindrical body (2) has a built-in power supply section 001, an oscillation section aη, and a transmission section α■.
The body 0) is provided with an antenna (c) and an ultrasonic transmitting element α, and the power supply unit (10) is further surrounded by a barrier 09). A microwave oven characterized in that it is equipped with a wireless temperature probe in which a lid body (T) is fitted into a bottomed cylindrical body (2).