JPH0142727Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention is applicable to microwave ovens that heat food using a high-frequency generating means such as a magnetron, or electric ovens that heat food using electric heating means such as a sheathed heater. In particular, the present invention relates to a display control device for notifying the end of cooking.

[Prior art]

Conventionally, for heating cookers such as microwave ovens,
Some devices generate a buzzer sound simultaneously with the completion of cooking to notify the user that the cooking has been completed. By the way, when using such a microwave oven, etc., the user is not only using the heating device such as the microwave oven, but also usually performs other cooking tasks at the same time. Therefore, I often miss the buzzer sound. Moreover, the display device that had been displaying the cooking time changes to the normal time display when cooking is finished, and the lamp that illuminates the inside of the oven of the heating cooker goes out when cooking is finished. There was a drawback that the cooked food inside was left unnoticed, causing the carefully cooked food to cool down. For this reason, as shown in Japanese Utility Model Application Publication No. 57-201402, for example, after cooking is completed, the lighting in the heating chamber is made to blink until the door is opened or closed to notify the user of the completion of cooking. The following was proposed.

However, blinking the illumination light in the heating chamber has the risk of significantly shortening its lifespan, similar to that of general incandescent light bulbs, and is not a particularly desirable method of use.

[Purpose of invention]

Therefore, in order to solve the above-mentioned conventional drawbacks, the present invention has been improved so that the time is displayed on the cooking time display device by blinking operation until the oven door is opened and closed after the end of cooking. In addition to being able to more accurately notify the completion of cooking, there is no risk of shortening the life of the lighting in the heating chamber, and there is also a dedicated This design eliminates the need for a separate notification device.

〔Example〕

An embodiment in which the present invention is embodied in a microwave oven with a heater will be described below. In FIGS. 1 and 2, 1 is a high-frequency generator consisting of a magnetron or the like as a first heating source, and 2 is a high-frequency generator including a magnetron or the like as a first heating source. 2, a heater as a heating source; 3, a door safety switch that responds to the opening and closing of the oven door 4 and closes only when the door 4 is closed; 5, a lighting lamp for illuminating the inside of the oven (heating chamber); 6 is a blower motor for cooling the magnetron.

Reference numeral 7 denotes a control circuit (display control circuit) consisting of a microprocessor etc. with a built-in clock circuit 7a, which detects the temperature inside the oven when the heater is heated, including the door switch 8 which detects the opening/closing state of the oven door 4. Temperature detector 9, front operation panel 1
0 (combined heater heating and high-frequency heating, high-frequency heating alone, heater heating alone) cooking type keys 11 to 13, a cooking switch 14 for instructing to start cooking, and a cooking switch 14 for instructing to start cooking, Manual (cancel) switch 15 for setting the cooking time (1 second, 10 seconds, 1 minute, 10 seconds)
Various signals are inputted to key switches 16 to 19 (corresponding to each digit of the minute), a temperature switch 25 for setting the temperature inside the oven, and a first switch for controlling the operation of the high frequency generator 1. A relay switch 20, a second relay switch 21 for controlling the operation of the heater 2, and a third relay switch 22 for controlling the operation of the illumination lamp 5 and the blower motor 6 are connected. .

Further, the control circuit 7 is connected to a buzzer 23 for notifying the end of cooking, and is also connected to a fluorescent tube display (display device) 24 arranged at the top of the front operation panel 10. A time display section 24a consisting of four-digit segment-shaped numerical elements that displays the cooking time or time, a three-type display section 24b that displays the type of cooking, and a temperature display section 24c that displays the internal temperature setting. It is designed to display the required information.

In the above configuration, the control circuit 7 lights up the time on the time display section 24a of the fluorescent tube display 24 based on the operation of the timekeeping circuit 7a so that it has a so-called clock function in a normal state when the heating cooker is not used. it's shown.

Therefore, when you are about to start cooking, put the food in the oven, close the oven door 4, and operate any of the type keys 11 to 13, the type display section 24b corresponding to each key will light up. At the same time, the time display on the time display section 24a is changed to the cooking time display, and the cooking time of "0" is initially displayed (for example, when the type key 1 for high frequency only
When 2 is pressed, the display shown in Fig. 4a is displayed).Furthermore, in the case of combined heating or heater heating, the temperature display section 24c is also lit, and the temperature of "250°C" is initially set. The corresponding bar segment will be lit.

Next, the required cooking time is set in the time display section 24a by operating each of the key switches 16 to 19 as appropriate (the numbers in each digit of the time display section 24a are sequentially updated in relation to the push operation of the switches 16 to 19). (1 minute and 30 seconds is displayed in Figure 4b), and in the case of combined heating and heater heating, operate the temperature switch 25 as necessary (press the temperature switch 25). In connection with the operation, the bar segments of the temperature display section 24c light up sequentially from top to bottom), so that the temperature display section 24c
After setting the desired temperature display bar segment so that it lights up, the cooking switch 14 is pressed to start cooking.

That is, in FIG. 2, when the type of cooking is selected and the cooking switch 14 is pressed with the oven door 4 closed, the control circuit 7 responds to this by turning on the first switch during high-frequency heating and combined heating.
The second relay switch 20 is closed to start the operation of the high frequency generator 1, and at the time of heater heating and combined heating, the second relay switch 21 is closed to start the operation of the heater 2, and at the same time,
By closing the third relay switch 22, rotating the blower motor 6, and lighting up the illuminating light 5, the finished state of the food in the oven can be easily observed from the outside.

Then, the control circuit 7 changes the display on the type display section 24b, which has been set in advance prior to cooking, from a continuous lighting state to a blinking state at the start of heating cooking to indicate that cooking is in progress,
When heating the heater alone or in combination, based on the detection signal from the temperature detector 9,
It is determined whether or not the temperature of the bar segment displayed by lighting on the temperature display section 24c has been reached, and the second relay switch 21 is controlled intermittently to turn on and off the heater 2 so that the set internal temperature is reached. However, the set temperature bar segment, which was lit continuously at the start, will now blink as the temperature inside the refrigerator rises and reaches the set temperature. Make it easy for users to understand.

On the other hand, the control circuit 7 sequentially counts down the time display on the time display section 24a as time passes after starting cooking, and when the time display reaches "0", that is, when the time display reaches "0", When the cooking time has elapsed, depending on the type of cooking at that time, the first relay switch 20 or the second relay switch 21 is opened to stop the operation of the high frequency generator 1 or the heater 2, and the heating cooking is started. Terminate it.

Then, when the cooking is finished, the control circuit 7 activates the buzzer 23 to notify the user that the cooking is finished, for example by making a buzzer sound, and also displays the time on the time display. The display at 24a is returned from the "0" time display to the time display (see FIG. 4c), and the time display is performed by blinking. Thereafter, when the opening/closing of the oven door 4 is detected based on the detection signal from the door switch 8, that is, when the oven door 4 is opened to take out food from the oven, the end of cooking is confirmed. Immediately, the time display section 24a stops displaying the time by blinking, shifts to a mode in which the time is displayed by normal continuous lighting, and waits for the next use of the cooker.

Further, the control circuit 7 does not immediately open the third relay switch 22 at the end of heating cooking, but maintains the closed circuit state until the opening/closing of the oven door 4 is detected, that is, when the food is removed from the oven. The oven door 4 is opened for this purpose, and this continues until the door 4 is closed again.

Therefore, even after the cooking is finished, the lighting lamp 5
lights up and brightly illuminates the inside of the oven, so you can easily observe the finished state of the food inside the oven from the outside without having to open the oven door 4 and look inside. If it is sufficient, additional heating can be performed immediately with the door 4 closed, which is extremely convenient.

In addition, even if you forget about the food stored in the oven because you are distracted by other cooking tasks and miss the sound of the buzzer 23, you can The illumination light 5 remains on until the opening/closing of the oven door 4 is detected, so that the presence of the food stored in the oven can be easily observed from the outside, so that the time display changes to the time display as soon as cooking is completed. Coupled with the blinking display in section 24a, the presence of food in the oven can be easily noticed, and it is possible to prevent forgetting to take out cooked food.

When the oven door 4 is opened or closed after heating is completed, the illumination light 5 is turned off immediately in response to the opening and closing of the door 4, so the illumination light 5 remains on for a long time. The blower motor 6 is not left in an idle state, and the blower motor 6 does not continue to rotate, and wasteful power consumption can be prevented as much as possible.

By the way, as is clear from FIG. 3, the control circuit 7 not only turns on the illumination lamp 5 and operates the blower motor 6 from the start of cooking until the oven door 4 is opened and closed after the end of cooking. Even when the oven door 4 is opened during normal time display or cooking settings, the lighting lamp 5 is turned on while the door 4 is open. Since the inside of the oven is always brightly illuminated when the oven door 4 is opened,
This is extremely convenient for tasks such as loading and unloading food.

In addition, the control circuit 7 controls when the oven door 4 is opened during cooking, or when the manual (cancel) switch 15 is pressed, when the high frequency is heating, either alone or in combination. Immediately, the first relay switch 20 is opened to stop its operation, and the countdown on the time display section 24a is stopped. Regardless, the second relay switch 21 is kept closed and the temperature inside the oven is prevented from decreasing. Then, by pressing the cooking switch 14 again with the oven door 4 closed,
The cooking operation and the countdown on the time display section 24a are restarted.

Even if the cooking time is displayed on the time display section 24a, if cooking is not being performed, pressing the manual (cancel) switch 15 immediately returns to the normal time display. If the state is a temporary stop during cooking, in response to the manual (cancel) switch 15, the operation of the illumination light 5 and blower motor 6 is stopped with the oven door 4 closed. also stopped (heater 2
If the heater 2 is in the heating operation, the operation of the heater 2 is also stopped).

[Effect of idea]

As explained above, the present invention is configured so that the time display is displayed by flashing until the opening/closing of the oven door is detected after the completion of heating cooking, so that, for example, the time display is displayed by blinking. Even if you miss the buzzer sound, you can easily notice that the food is still in the oven because of the flashing time display, and you can avoid forgetting to take it out.
Moreover, the configuration for this purpose is extremely simple, requiring only a partial change in the mode of normal time display, and there is no need to add new special display parts. As shown in the publication, there is no risk of shortening the life of the lighting lamp in the heating chamber, and there are excellent practical effects.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the heating cooker with the oven door open, Fig. 2 is an electric circuit diagram, Fig. 3 is an explanatory diagram of its operation, and Figs. 4 a to c are explanatory diagrams showing display contents. . 1 is a high frequency generator as a heating source, 2 is a heater, 3 is a door safety switch, 4 is an oven door,
7 is a control circuit (display control circuit), 8 is a door switch, 15 is a manual (cancellation) switch, 16 to 19 are key switches as cooking time setting means, and 24 is a fluorescent tube display as a display device.

Claims (1)

[Scope of utility model registration request] A heating chamber that stores and cooks objects to be heated, a heating source 1 that supplies energy into the heating chamber, and a door 4 that is openable and closable at the opening of the heating chamber.
, a door switch 8 that opens and closes in response to the opening and closing operation of the door 4, and cooking time setting means 16 to 19 for setting the cooking time using the heating source 1.
and a segment-type numerical display device 24 such as a fluorescent tube display that displays the cooking time or time set by the cooking time setting means 16 to 19; A display control circuit that displays the time and starts displaying the time by flashing operation when cooking is finished, ends the flashing operation by the door switch 8 that responds to the opening and closing of the door 4, and shifts to the time display by normal continuous lighting operation. 7. A heating cooker comprising: