Electric heating – Metal heating – Of cylinders
Patent
1984-12-28
1986-10-14
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055R, 250351, 250347, 350 66, 374121, 374149, H05B 668, G01J 100
Patent
active
046174389
ABSTRACT:
An infrared ray detecting apparatus comprises an infrared ray detecting element (5), bimorph elements (8a and 8b), a transistors (53, 54), a DC-DC converter (55), and a volume (56). A square wave signal is applied to a base of the transistor (53) from a microprocessor (40) included in a microwave oven and a signal having a constant level is applied to a base of the transistor (54). The DC-DC converter (55) is continuously driven in response to an emitter output from the transistor (54) so that a constant voltage -E.sub.0 V which is extremely stable is supplied. A voltage -E.sub.s V which is obtained by regulating properly the constant voltage -E.sub.0 V by means of the volume (56), is applied to central electrodes of the bimorphs (8a and 8b), while a square wave signal varying between 0 V and -E.sub.0 V in response to an on/off state of the transistor (53), is applied to a surface electrodes of the bimorphs (8a and 8b). The square wave signal has a round in its leading edge, due to a time constant comprising resistances of R.sub.1, R.sub.2, R.sub.3, r.sub.1, r.sub.2 and electrostatic capacity of the bimorphs (8a and 8b).
REFERENCES:
patent: 3811748 (1974-05-01), Treuthart
patent: 4087690 (1978-05-01), Prober
patent: 4262198 (1981-04-01), Gupta et al.
patent: 4347418 (1982-08-01), Nobue et al.
patent: 4461941 (1984-07-01), Fukuda et al.
Leung Philip H.
Sanyo Electric Co,. Ltd.
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