| 摘要 |
PROBLEM TO BE SOLVED: To change over a control of an oven to the state of combustion of gas by a user, routinely recognize by a user in a predetermined period that even if the user separates from the oven within a predetermined range, the user is at the position of the combustion of gas, previously prevent a danger state such as a fire and so on from occurring owing to such a fire being forgotten to be extinguished, judge the elapse of time of the combustion of gas, and further miniaturize a portable system for the recognition and make it lightweight. SOLUTION: A generator is installed on the side of an oven, and a user has a portable receiver corresponding thereto. A power supply to the generator is off at the interruption position of gas of all controls to interrupt the radiation of electric waves. If any thumbscrew is at the position of the gas combustion, the power supply for the generator is on to radiate electric waves. A user staying within a range to which electric waves come recognizes a reception signal by the portable receiver as a periodic sound. Further, the receiver can be adapted to display the time elapsed. The portable receiver is miniaturized and is made lightweight with the configuration of a pendant or a brooch.
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