Apparatus with an infrared ray detecting temperature sensor
First Claim
1. In a microwave oven including a microwave oscillator circuit, and microprocessor means responsive to an output signal from an infrared ray detecting apparatus, for controlling the output power of said microwave oscillator circuit, wherein said infrared ray detecting appparatus comprises:
- an infrared ray detecting element;
optical chopper means for making an infrared ray to be measured intermittently incident on said infrared ray detecting element, said optical chopper having at least one bimorph element and a shutter portion mounted to said bimorph element, said shutter portion performing a chopper action in response to displacement of said bimorph element;
driving means including generator means for generating a driving signal having a substantially square wave shape, wave shaping means for forming a rounded leading edge in said driving signal generated by said generator means, for substantially preventing the production of mechanical noise by said bimorph, and coupling means for coupling said driving signal with a rounded leading edge to said bimorph element for driving said optical chopper;
said generator means of said driving means including a source of direct current voltage, and DC-DC converter means connected to said source of direct current voltage for producing said driving signal; and
means responsive to an output signal from said infrared ray detecting element, for producing said output signal of said infrared ray detecting apparatus.
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Accused Products
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 -E0 V which is extremely stable is supplied. A voltage -Es V which is obtained by regulating properly the constant voltage -E0 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 -E0 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 R1, R2, R3, r1, r2 and electrostatic capacity of the bimorphs (8a and 8b).
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Citations
20 Claims
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1. In a microwave oven including a microwave oscillator circuit, and microprocessor means responsive to an output signal from an infrared ray detecting apparatus, for controlling the output power of said microwave oscillator circuit, wherein said infrared ray detecting appparatus comprises:
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an infrared ray detecting element; optical chopper means for making an infrared ray to be measured intermittently incident on said infrared ray detecting element, said optical chopper having at least one bimorph element and a shutter portion mounted to said bimorph element, said shutter portion performing a chopper action in response to displacement of said bimorph element; driving means including generator means for generating a driving signal having a substantially square wave shape, wave shaping means for forming a rounded leading edge in said driving signal generated by said generator means, for substantially preventing the production of mechanical noise by said bimorph, and coupling means for coupling said driving signal with a rounded leading edge to said bimorph element for driving said optical chopper; said generator means of said driving means including a source of direct current voltage, and DC-DC converter means connected to said source of direct current voltage for producing said driving signal; and means responsive to an output signal from said infrared ray detecting element, for producing said output signal of said infrared ray detecting apparatus.
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2. An infrared ray detecting apparatus comprising:
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an infrared ray detecting element; optical chopper means for making an infrared ray to be measured intermittently incident on said infrared ray detecting element, said optical chopper having at least one bimorph element and a shutter portion mounted to said bimorph element, said shutter portion performing a chopper action in response to displacement of said bimorph element; and driving means including generator means for generating a driving signal having a substantially square wave shape, wave shaping means for forming a rounded leading edge in said driving signal generated by said generator means, for substantially preventing the production of mechanical noise by siad bimorph, and coupling means for coupling said driving signal with a rounded leading edge to said bimorph element for driving said optical chopper. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification