JPH0633283Y2 - microwave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to improvement of the opening and closing action and overall shape of a switch contact of a microwave oven which heats and cooks food by irradiating high frequency power.

[Prior Art] Microwave ovens for cooking foods using a principle of heating a dielectric such as water or oil by applying high-frequency electric power to the food have become widespread. According to this principle, there are various merits such as the frozen food can be thawed and the finish of cooking is good because the heating time is shortened and uniform heating is performed, and it occupies a position as a cooking utensil indispensable for modern dietary habits. It's starting.

The heating action in the microwave oven is to rectify the voltage of several MHz generated on the secondary side of the high-voltage transformer by double-voltage rectification by the action of the diode and the high-voltage capacitor, and apply this to the anode (anode) of the magnetron tube to oscillate. It is carried out by

FIG. 3 shows an external perspective view of a general microwave oven. FIG. 3A shows the door closed and FIG. 3B shows the door open.

Rotatable food tray (2) in a box-shaped case (1)
The cooking chamber (3) in which the food is arranged is formed, and the user stores the food to be cooked in the cooking chamber (3) by opening and closing the door (4) attached to the front of the cooking chamber (3). And take out. On the side of the door (4) on the front of the case (1), there is a menu selection switch (5a) for selecting a cooking menu and a timer (5b) for setting the heating time and heating power.
An operation panel (5) including is formed.

The heating part mainly composed of a high-voltage transformer, a high-voltage condenser, a magnetron, etc. for generating the microwave and irradiating the microwave into the cooking chamber (3) is provided between the case (1) and the cooking chamber (3). It is housed and arranged in the formed space.

The conventional microwave oven has the above-mentioned configuration, and the user opens the door (4) to use the cooking chamber (3).
After setting the food on the food plate inside, close the door (4), select the cooking menu (5a) and turn on the timer (5b), and microwaves from the heating part (not shown) guide the waveguide. The food is guided to the inside of the cooking chamber (3) through the cooking process. Since the circular food placing plate (2) rotates at a predetermined speed at the same time as the start of cooking, the food on the placing plate (2) can be uniformly heated and cooked.

The timer (5b) slowly moves toward the off position as the cooking time elapses, and at the same time as reaching the off position, a predetermined notification sound sounds and the cooking is completed.

[Problems to be solved by the invention] However, in the above-mentioned conventional microwave oven, the power supply for starting and ending the cooking is turned on and off exclusively by operating the timer (5b). However, there was a problem that the contact of the time switch was severely worn due to overuse, and the life was shortened remarkably.

The present invention has been made in view of the above conventional problems, and an object thereof is to reduce friction of switch contacts due to on / off operations for starting and ending cooking and to prolong the life of the contacts. It is to provide a microwave oven that can.

[Means for Solving the Problems] In order to achieve the above object, the present invention forms a latch switch at a contact portion between a door of a microwave oven and a cooking chamber, and opens an illumination lamp of an operation panel by opening the door. It is characterized in that it is turned on and the cooking action is started while the lighting lamp is turned on by the closing operation, and the cover is formed on the door to cover the timer of the operation panel when the door is closed.

[Operation] According to the present invention configured as described above, when the door is closed, the timer is completely covered by the cover and cannot be seen from the outside.

Then, the latch switch is turned on by the opening operation of the door, the illumination lamp built in the operation panel is turned on, and the menu is displayed. After setting the food in the cooking chamber, the memory of the timer is adjusted to a predetermined position. Then, when the door is closed thereafter, the heating and cooking action is started at the same time as the door is closed by the latch switch.

The timer slowly moves toward the off position as soon as the cooking is started, and a predetermined alarm sounds when the off position is reached.
The cooking action ends.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.
In the figure, the same components as those of the conventional device are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 is an external perspective view of the microwave oven according to the present invention when the door is closed (A) and when the door is opened (B).

The present invention is characterized in that a latch switch that is turned on and off by a latch (13) when a cooking chamber (3) and a door (4) are brought into contact with each other and a lighting switch (7) that is operated by the latch (13) are provided. , The lighting operation of the operation panel is turned on by the opening operation of the door, and the cooking operation is started while the lighting lamp is turned on by the closing operation, and the operation panel (5) is provided on the side of the door (4) when the door is closed. Is to form a panel cover portion (4a) covering the entire surface.

As a result, the power supply for starting the cooking action is performed by closing the door (4), while the completion of cooking is stopped by the timer (5
This is done by automatically returning to the OFF position in b). In this way, the power supply is turned on and off not by the opening and closing of a single switch, but by the sharing action of the timer (5b) and the latch switch (6), which causes contact wear. Will be halved and its life will be extended.

Further, the panel cover (4a) formed on the side of the door (4) makes the whole microwave oven a neat and clean box when the door is closed as shown in FIG. It can be understood that it brings about unexpected surprises and creates a new function as a kitchen decoration or furniture.

The operation of the microwave oven according to this embodiment will be described below with reference to FIG.

FIG. 2 (A) is a circuit diagram showing the state of the contacts when the door of the microwave oven according to the present invention is opened. Door (4)
At the same time, the latch switch (6) opens, and at the same time, the lighting switch (7) comes into contact with the terminal (7a), so that the lighting lamp (8) is turned on. In the embodiment, the illumination lamp (8) serves as both the illumination inside the operation panel (5) and the illumination inside the cooking chamber (3).

The monitor switch (9) is provided to prevent the leakage of high frequency to the outside by shutting off the fuse (10) when the door (4) is opened when the latch switch (6) has an abnormality such as contact welding. Has been.

This monitor switch (9) also closes at the same time the door is opened.

Thus, at the same time when the door is opened, the cooking menu (5a) on the operation panel (5) and the inside of the cooking chamber (3) are illuminated, and the setting and cooking of the food on the food placing plate (2) in the cooking chamber (3) are performed. The menu (5a) can be easily viewed.

After the food is set, the user selects the corresponding cooking menu (5a), sets the cooking time and cooking power by operating the timer (5b), turns on the time switch (12), and turns on the door (4). ) Is closed. Simultaneously with the closing of the door (4), the latch switch (6) is turned on, whereby the microwave is emitted from the high frequency oscillator (11) toward the inside of the cooking chamber (3), and heating and cooking is started.

As is clear from the figure, the illumination lamp (8) remains lit during this cooking, so that the user can enter the cooking menu (5a) and the cooking chamber (3) through the smoke translucent shield of the door (4). The food of is visible.

As described above, the timer (5b) slowly moves toward the off position with the start of cooking when the latch switch (6) is turned on and then reaches the off position, and at the same time, a predetermined alarm sounds. , Cooking is complete. At this time, the power is turned off, and the lights in the cooking chamber (3) and the operation panel (5) are also turned off.

In this state, the user opens the door (4) to take out the food in the cooking chamber (3), but at the same time as the door is opened at this time, the illumination lamp (8) is turned on again to cook the food. Makes it easy to take out the processed food. In this state, since the timer (5b) is already in the off position, the illumination lamp (8) is turned off at the same time when the user finally closes the door (4), and no power is supplied to the high frequency oscillator (11).

As shown in FIG. 1 (A), in this embodiment, the user performs a door opening operation between the panel cover portion (4a) of the door (4) and the operation panel (5). It is designed so that a predetermined gap is created in the space, and the user can easily open the door (4) by inserting a finger into this space.

Thus, according to this embodiment, the latch switch (6),
Lighting switch (7) and timer (5) on operation panel (5)
Since the power switch is turned on and off and the lighting lamp is turned on and off by using the time switch (12) in b), the number of single contacts opened and closed is halved compared to the conventional device, so there is less contact friction. Therefore, the life can be extended.

Furthermore, by providing the panel cover portion (4a) on the door (4), the operation panel (5) is covered when the door is closed, which is very effective in terms of protection and aesthetic appearance of the operation panel (5).

[Effect of the Invention] As described above, according to the present invention, the power switch is shared by the latch switch and the time switch, and the panel cover portion for covering the operation panel is formed on the door so that the operation panel can be used only at the time of use. With a novel design from the perspective of appearing outside, it is possible to improve the performance of the microwave oven and make a great contribution in terms of safety and aesthetics.

[Brief description of drawings]

FIG. 1 (A) is an external perspective view of the microwave oven according to the present invention when the door is closed, and FIG. 1 (B) is an external perspective view showing the opened state of FIG. 1 (A). A) is a circuit diagram when the door of the device of the present invention is opened, FIG. 2B is a circuit diagram when the door of the device of the present invention is closed, and FIG. 3A is an external perspective view of the conventional device, FIG. 3 (B) is an external perspective view when the door of FIG. 3 (A) is opened, FIG. 4 (A) is a circuit diagram when the door of the conventional device is opened, and FIG. 4 (B) is It is a circuit diagram when the door of the conventional apparatus is closed. In the figure, (1) is a case, (3) is a cooking chamber, (4)
Is a door, (4a) is a panel cover portion, (5) is an operation panel, (6) is a latch switch, and (8) is an illumination lamp. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A cooking chamber in which food to be cooked is housed, a door formed in front of the cooking chamber, a heating unit for supplying microwaves into the cooking chamber, and a door disposed on the side of the door. In a microwave oven including a setting panel for a cooking time and a time switch for turning off the power supply to the heating unit after the set time has elapsed, the power supply to the heating unit is turned off by opening the door, A latch switch that turns on the power supply to the heating unit when the door is closed while the time switch is on, and a panel that covers the time switch of the operation panel when the door is closed. A microwave oven comprising: a cover portion.