JPS63264891A - Heating device - Google Patents

Abstract

PURPOSE:To obtain a system of an excellent durability and safety and bearable to noises by arranging an operating board and a main control at the inside of a door, and making them to connect to a heating device electrically when the door is closed while to release the electric connection when the door is opened. CONSTITUTION:Operating pieces 7 to set the heating time period and the like, a display 8 to display the heating time period, its development, and the like, and a main control to decode and display the signal input from the operating pieces 7 and control a heating device and the like are arranged inside a door 3. And the main control and the heating device etc. incorporated in a main body 1 are connected by a connecting means to link electrically only when the door is closed. In such a way, the main control inside the door 3 and the heating device in the main body 1 are connected by the connecting means to link only when the door is closed by using no cable and the like. As a result, the set heating time period and the like are maintained without losing a correct condition even when the door is closed, and the trouble of miscontact of the power line and the control line continuing the operation of the heating device is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement of the operation panel of a device equipped with a door, and is intended to innovate the structure of embedding the operation panel in the door of, for example, a microwave oven or an electric opener.

2. Description of the Related Art Devices equipped with a conventional door and an operation panel include microwave ovens, electric ovens, and combination devices thereof. These have a heating chamber in which an object to be heated is placed, and a door is pivotally supported in the opening of the heating chamber so as to be openable and closable. The control panel is equipped with control pieces that control heat sources such as magnetrons. For such devices, many structures have already been proposed in which the operation panel is embedded in the door. The best example is U.S. Patent No. 4.255.640 (Bres
s ler ). This device has an operating piece and a controller embedded in the door, and this controller controls the magnetron and other devices placed on the main body. The controller and components such as the magnetron are connected by flexible cables that pass near or through the door hinge. This configuration not only makes effective use of the door space and allows for a compact design, but also allows for easy signal transmission between the door and the main unit by passing a flexible cable through the vicinity of the hinge. Became.

Problems to be Solved by the Invention However, this system still has the fundamental problem of cable durability. In the case of microwave ovens, the lifespan of the door is set to be 100,000 times or more. It has been extremely difficult to select a flexible printed cable or optical fiber that can withstand repeated bending and bending 100,000 times at a low price for consumer use.

Next, if the cable were to short circuit, would there be any danger? When the magnetron continuously oscillates, the temperature outside the aircraft becomes abnormally high, posing a high risk of fire or burns.

In this respect, the cable method had difficulties in terms of fail-safe.

The cited example also points out that the signal transmission between the door and the main body is made more resistant to noise caused by microwaves and the like because the controller is built into the door.

However, can we really say that the structure that allows the cable to pass through the hinge, the gap between the door and the main body, where microwaves are likely to leak, is resistant to noise? There remains a high risk that the cable itself will pick up noise and cause the magnetron to malfunction.

In view of these conventional problems, the present invention realizes a system that is excellent in durability, takes into account fail-safe aspects, and is resistant to noise.

Means to Solve the Problems In order to solve the above-mentioned problems, the heating device of the present invention has an operation piece in the door for setting a heating time limit, etc., and displays the set heating time period and its progress. A display unit, a main control unit that decodes and displays signals input from the operation piece and controls heating means, etc., and a battery or a capacitor connected to the power supply line that supplies power to this main control unit. The main control section and the heating means built into the main body are connected using a connecting means that is electrically conductive only when the door is closed.

Function: The heating device of the present invention connects the main control part inside the door and the heating means inside the main body by a connecting means that conducts only when the door is closed, without using a cable, and releases this connection when the door is opened. At the same time, the battery or capacitor inside the door continues to supply power to the main control unit, so the set heating time limit is lost even when the door is opened, and the power line and control signal line are There is no risk of contact occurring and the heating means continuing to operate.

EXAMPLES Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of the main body of a microwave oven showing an embodiment of the present invention. The main body 1 houses various controlled parts and a heating chamber 2. The front opening is closed by a door 3, and the door 3 is rotatably supported. The oven lever 4 is an operating piece for unlocking the door 3 and opening the door.

The door key 5 engages the body and locks the door 3 in the closed position. Of course, it may be a handle.

An operation panel 6 is embedded above the door 3. The operation panel 6 includes an operation piece 7 and a display section 8, and a user's heating command is input to the controller.

The controller is arranged on the back side of the operation panel 6, and is connected to a controlled part such as a magnetron on the main body 1 side by a connecting means. For this purpose, the contact window 9 is an opening provided in the main body, and is provided with a conductive piece inside.

A similar contact window is provided on the inside of the opposing door 3, and a contact piece is provided inside.

FIG. 2 is a cross section taken along line xx of such a heating device.

The operation panel 6 has a thin structure like a card calculator, and is attached to the position where the screen 1o is attached. A controller is included in the operation panel 6 and is connected to a controlled section 11 on the main body 1 side by a connecting means 12. The specific structure of this connecting means will be explained in detail with reference to FIG.

Now, the controlled part 11 has a magnetro/13 which is a heating means.
Components that are difficult to incorporate into the operation panel 6 are mounted, such as relays that control the power supply to the control panel 6, capacitors that cannot be made into chip components, and power transformers.

A rotary mounting table 14 is provided in the heating chamber 2, and the object to be heated 1
Improve the uneven baking in step 5. Reference numeral 16 denotes a motor serving as a driving source for this rotary mounting table 14.

Next, a specific example of the configuration of the connecting means will be explained using FIG. 3. In this embodiment, a bottle and a socket were used as the connection means. A signal line 17 is drawn out from the back side of the operation panel 6 and guided through a shield sleeve 18. The shield sleeve 18 passes through the choke 19 and prevents the signal line 17 from picking up microwave noise. 2o is a dielectric material such as plastic that closes the choke opening. A contact piece 21 is fixed to the dielectric 2o and connected to the signal line 17. On the other hand, a socket 22 serving as a conductive piece is arranged on the controlled part 11 on the main body side, and is fitted into the bottle 21 when the door is closed. A shield sleeve is used as appropriate, and a shield wire also has an effect.

Now, the structural example of the present invention has been described above, and next, the circuit structure will be explained.

FIG. 4 is a circuit diagram showing one embodiment of the present invention.

The controller 23 built into the operation panel has a microcomputer 24 (hereinafter abbreviated as "microcomputer") which is the main control unit.
is included and controls the entire system. Operation piece 7
are arranged in a matrix and input various operation commands to the microcomputer 24. For example, a liquid crystal display is used as the display section 8, and is dynamically turned on by the microcomputer output Do~27.

This controller 23 is equipped with a battery 26 .

This allows the controller 23 to operate independently of the main body even when the door is opened. As this battery, a lithium battery as a primary battery or a nickel-cadmium battery as a secondary battery that is charged when the door is closed can be used. Of course, it may also be a solar cell.

Note that 26 is a clock oscillation circuit for a timer, whose frequency is appropriately divided within the microcomputer 24, and is used as a clock base for decrementing the heating time, etc.

On the other hand, controlled parts and a DC power source are arranged in the controlled section 11 . The DC power supply 27 consists of a low-voltage transformer and a rectifier circuit, and supplies power to components that require relatively large amounts of power, such as relays and buzzers.

The main relay 28 functions as a time switch that remains on during cooking, and the power intermittent relay 29 functions as an output switching means that periodically switches on and off during cooking to vary the average output of the magnetron.

Of course, if you don't need output switching, you don't need a power intermittent relay. The buzzer 30 is used to notify the completion of cooking and the valid input of the operation piece 7.

Now, the controller 23 and the controlled part 11 are connected by the contact piece 21 and the conductive piece 22, which are connection means, when the door is closed.

o2. o3. o4 are buzzer 30 and power intermittent relay 29. This is a signal that controls the main relay 28. These signals are each connected to a contact piece 21, and contact a conductive piece 22 to which a corresponding controlled component is connected.

On the other hand, the signal 06 is output from the microcomputer 24 and the contact piece 3
1a. A contact piece 31b electrically separated from this is connected to the input terminal IN of the microcomputer 24. A shorting piece 32 is provided on the main body side at a position corresponding to the pair of contact pieces 31. According to such a configuration,
When the door is open, no signal is input to the IN input, and when the door is closed, the output 06 is short-circuited and input. Therefore, opening and closing of the door can be detected. The contact piece 31a may be connected to a +5V potential or the like. In this way, according to this embodiment, opening and closing of the door can be detected without using conventional microswitches.

Next, another embodiment of the present invention will be described with reference to FIG. There are three major differences between this embodiment and the previous embodiment (FIG. 4).

First of all, the method of detecting door opening/closing is different. In the previous example, the shorting piece 32 was provided on the main body side, but in this example, the conducting piece 33 was provided.
, which is connected to a pulsed power supply. Therefore, the controller 23 receives a pulse signal from this pulse power source when the door is closed, and the IN input becomes no signal when the door is opened. Therefore, opening and closing of the door can be detected. Note that the conductive piece 33 may be connected to a +6V potential or the like.

The second pulse power source is formed by a clock pulse circuit 34 that rectifies the AC commercial power source. Therefore, the microcomputer 24 can decrement the timer by counting the clock pulses when the door is closed. Therefore, a clock oscillator on the controller 23 is not required. Since no clock pulse comes when the door is opened, the timer's decrement is automatically stopped. In addition, a failure in the clock circuit is handled in the same way as a door opening operation, and safety can be maintained without any special software considerations for the microcomputer 24.

Third, the controller 23 is equipped with a battery 26 and a capacitor 36, and a power supply voltage is supplied through a contact piece 36 and a conductive piece 37.

The capacitor 39 is charged when the door is closed, and supplies power to the controller 27 instead of the battery when the door is opened.

Effect of the invention As described above, the heating device of the present invention has the following effects.

First, since the controller and the main body can be connected without cables, there is no need to worry about cable breakage caused by opening and closing the door9, dramatically extending the service life.

Second, the controller and the main body can be connected over the shortest distance, and are much less susceptible to noise caused by microwaves, etc., than in the conventional example in which the cable detours around the hinge.

Thirdly, in conventional cable connections, there is a risk that the control line and the power line may come into contact due to breakage, causing the relay to not turn on, whereas in the present invention, there is no cable, so there is no possibility of such contact. I can't help it. Fourthly, since the controller is equipped with a battery or a capacitor, even after the heating time limit is set, the set time limit, etc. is maintained without being lost even if the door is opened. Furthermore, even if a power outage occurs, the controller will continue to operate without any problems. Since such an abnormality on the main unit side can be detected by abnormalities in the door signal or clock signal, it is possible to interrupt cooking if it is in progress, and the cooking can be restarted automatically after the failure is recovered, greatly increasing safety. Fifth, if the door is opened, the relay is forcibly turned off due to the circuit configuration, making it safe.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main body of a heating device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line XX, and FIG. 3a. b, a are sectional views of essential parts showing a specific example of the structure of the contact means, FIG. 4 is a circuit diagram showing an example of the circuit of the same device, and FIG.
The figure is a circuit diagram showing another embodiment. 1...Main body, 2...Heating chamber, 3...
... Door, 6 ... Operation panel, 7 ... Operation piece, 11 ... Controlled part, 12 ... Connection means, 13 ... ...Heating means (magnetron),
15...Object to be heated, 21...Contact piece (
Py), 22... Continuity piece (socket), 24.
...Main control section. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
-4 pieces each? ---Power I] Yosa 1 [ 6-Loss board Figure 2 Figure 3 Procedural amendment (method) % formula % 1 Display of case 1985 Patent Application No. 241286 2 Name of invention Heating device 3 Amendment Relationship with the case of a person filing a patent application
Colonel Tokoro 1006 Kadoma, Kadoma City, Osaka Prefecture
(582) Representative Director, Matsushita Electric Industrial Co., Ltd.
Akio Tanii 4 Agent 571 Address 7, Matsushita Electric Industrial Co., Ltd., 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture "Figure 3 &b" on page 13, lines 11-12 of the statement of contents of the amendment ,
Correct QJ to "Figure 3".

Claims (1)

[Claims] A heating chamber in which an object to be heated is placed, a heating means coupled to this heating chamber, a main body containing these heating chambers, heating means, etc., and a door supported in an opening of the heating chamber so as to be openable and closable;
An operation piece for setting the heating time limit, etc., a display section for displaying the set heating time limit, etc., an operation panel including these operation pieces and the display section, and a control panel that decodes the signal input from the operation piece and displays the above-mentioned display. and a main control section that controls the power supply to the heating means, and a connecting means that electrically connects the main control section and the heating means. is arranged in the door, and the main control section is configured to be electrically connected to the heating means by the connecting means when the door is closed, and disconnected from the electrical connection when the door is opened. A heating device that has a built-in battery or a capacitor connected to a power supply line, and is configured to supply power to the main control unit through the battery or capacitor connected to the power supply line at least when the door is opened.