Method for heating a plurality of foods uniformly, and cooking h

Details Method for heating a plurality of foods uniformly, and cooking h Method for heating a plurality of foods uniformly, and cooking h

1998-01-09

1999-10-26

Hoang, Tu Ba

Electric heating

Heating devices

With power supply and voltage or current regulation or...

H05B 102

Patent

active

059733004

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to methods using a cooking heater for heating a plurality of foods simultaneously and heating up the foods uniformly so that each of the foods may not be heated up differently in temperature, and relates further to a cooking heater employing these methods.


BACKGROUND OF THE INVENTION

A conventional cooking heater using a high frequency is a microwave oven depicted in FIG. 10. A cooking heater 1 had a front door 2 through which a user can insert or remove foods to/from a chamber 3. A high-frequency-generator 4 is disposed in the cooking heater 1, and the high frequency is irradiated into the chamber 3 through an irradiation opening 5 formed on a ceiling of the chamber 3. The irradiation opening 5 is not always formed on the ceiling, but it may be formed on a rear face or side face. The irradiation opening 5 may be formed in plural. A humidity sensor 6 senses humidity produced by the cooking. The user can identify the cooking progress by using the humidity sensor 6. A weight sensor 7 adjusts a cooking time depending on a weight of each food. These sensors are not always used together, but are used independently or used with other sensors.
When cooking foods by such a cooking heater using a high frequency as described above, several cooking methods are available: (1) heating for a predetermined time, (2) automatic cooking through controlling the operation according to a humidity and weight detected by the sensors, (3) programmed cooking which specifies an output of high frequency and irradiation time in detail. Since these methods are used properly for types of foods, quantities and details of cooking, a good result is obtained depending on a condition.
However, heat values from each food by high-frequency-heating are not the same but differ from each other, therefore, in principal, fine temperature adjustment is difficult for this heating method. It is also difficult for this high-frequency-heating to heat foods uniformly. In the case of heating a plurality of foods simultaneously in the chamber, not only types of foods and quantities, but also location of foods within the chamber changes the heating characteristics. Uniform heating of plural foods thus becomes much more difficult. The problem of uniform heating when heating up plural foods simultaneously is also found in cooking heaters other than the high-frequency cooking heater. For example, when using an oven having a heater on its ceiling, the nearer a food is placed from the ceiling, the sooner the food is heated, and the farther is a food placed to the heater, the slower the heating process. In the case of a convection oven, uniform heating over all of the foods is also difficult, and uneven heating inevitably occurs due to a location of the hot air outlet and placement of food in the chamber.
Although the conventional cooking heater has a function for heating the foods uniformly without unevenness as stated above, it has still a drawback that it cannot heat up plural foods uniformly and simultaneously.
The invention overcomes the above drawback, namely, by heating up the plural foods uniformly when heating up the plural foods simultaneously.


SUMMARY OF THE INVENTION

The first method and cooking heater of the invention for heating up a plurality of foods uniformly can be realized by using a cooking heater comprising the following means: temperature of the plurality of foods, predetermined set-temperature, comparison result by comparison means,
In the cooking heater, the temperature detected at specific time intervals is compared with the set-temperature by the comparison means. When all the detected temperatures from the plurality of temperature detection means are lower than the set-temperature, the control means powers on the heat source, and when any one of the detected temperatures is higher than the set-temperature, the control means powers off the heat source. At the moment when all the detected temperatures exceed the set-temperature, the control means controls the heat source so that all the

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Japanese language search report for Int'l Appln. PCT/JP96/01925 dated Oct. 8, 1996.
English translation of Japanese language search report.
European Search Report for Int'l Appln No. EP 96 92 3057 dated May 6, 1999.

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