Abstract: A high-frequency heating apparatus includes: a high-frequency oscillator for generating high-frequency electromagnetic waves using electrical power supplied from a power source circuit; a heating chamber into which the high-frequency electromagnetic waves are supplied by the high-frequency oscillator; a receiving antenna which is provided outside the heating chamber and adjacent to an opening of the heating chamber; a dielectric plate for covering the opening, which is provided between the heating chamber and the antenna; and a control circuit which receives an output from the antenna via a detector so as to output a control signal to the power source circuit.

Abstract: Novel siloxane derivatives represented by general formula (1): ##STR1## A method for producing the siloxane derivatives and agents such as cosmetic preparations, emulsifying dermatotherapeutic external agents and the like including at least one of the siloxane derivatives are also disclosed.

Abstract: A heating and cooking apparatus has a detection sensor for sensing the state of heating so as to automatically control the heating operation. A partition is disposed so as to be opened to the inside of an auxiliary passage which has an inlet located at a position in the vicinity of the circumference of an impeller of a cooling fan for cooling a magnetron provided on the back side of a heating chamber and through which steam from the heating chamber is discharged to the outside. Air supplied by the fan is blown off into the auxiliary passage so as to generate a venturi action, thus promoting the flow of steam in the auxiliary passage. The detection sensor is disposed in the auxiliary passage at a position in the vicinity of a region where air is blown off so as to accurately sense the state of steam generated from a material to be heated.

Abstract: A cooking apparatus such as a high-frequency heating-cooking apparatus having a pyroelectric vapor sensor for detecting the cooking condition of food comprises an air duct for delivering vapor to the pyroelectric vapor sensor and a cooling construction for providing cool air to mix with the vapor as well as cool air to cool the pyroelectric vapor sensor.

Abstract: A pyroelectric sensing apparatus is provided with an A/D convertor 29, whose digital output is examined whether continuation time period of the output from the pyroelectric element is longer than a predetermined reference time period such as 500 m sec; thereby mal-operation due to noise output from the pyroelectric element generated by mechanical shock (door close) or electric shock (pulling out a plug of other apparatus) is eliminated.