Smoke detector having an integral piezo-electric buzzer
First Claim
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1. A smoke detector comprising:
- a base;
a housing having at least one aperture, said housing operatively connected to said base, said base and said housing forming a smoke detection region therebetween;
first and second electrodes, respectively operatively mechanically connected to said base and said housing, whereby said smoke detection region is between said first and second electrodes;
a radiation source located within said smoke detection region and operatively connected to said base for emitting radiation in said smoke detection region;
a detector circuit means electrically operatively connected to said first and second electrodes for providing an electrical signal in response to smoke entering said smoke detection region through said at least one aperture, said smoke affected by said emitted radiation;
a piezo-electric element operatively mechanically connected to one of said first and second electrodes and electrically connected to said detector circuit means, said piezo-electric element vibrating said one of said first and second electrodes to which it is mechanically operatively connected in response to said electrical signal from said detector circuit means for producing an audible alarm, whereby said audible alarm is indicative of the presence of smoke.
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Abstract
A fire detector comprises a piezo-electric element attached to a vibrating portion which is part of a component constituting the detector. The component having the vibrating function may be a casing or an electrode or any other suitable member. The piezo-electric buzzer is thus incorporated in the detector to form a simple and compact fire detector with an alarm device.
21 Citations
8 Claims
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1. A smoke detector comprising:
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a base; a housing having at least one aperture, said housing operatively connected to said base, said base and said housing forming a smoke detection region therebetween; first and second electrodes, respectively operatively mechanically connected to said base and said housing, whereby said smoke detection region is between said first and second electrodes; a radiation source located within said smoke detection region and operatively connected to said base for emitting radiation in said smoke detection region; a detector circuit means electrically operatively connected to said first and second electrodes for providing an electrical signal in response to smoke entering said smoke detection region through said at least one aperture, said smoke affected by said emitted radiation; a piezo-electric element operatively mechanically connected to one of said first and second electrodes and electrically connected to said detector circuit means, said piezo-electric element vibrating said one of said first and second electrodes to which it is mechanically operatively connected in response to said electrical signal from said detector circuit means for producing an audible alarm, whereby said audible alarm is indicative of the presence of smoke. - View Dependent Claims (2, 3, 4, 5)
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6. A smoke detector comprising:
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a base; a housing having at least one aperture, said housing operatively connected to said base, said base and said housing forming a smoke detection region therebetween; a light emitter source located within said smoke detection region and operatively connected to said base for emitting light in said smoke detection region; a detector means including a light sensor mechanically operatively connected to said base for providing an electrical signal in response to smoke entering said smoke detection region through said aperture; a piezo-electric element operatively mechanically connected to said housing and electrically connected to said detector means, said piezo-electric element vibrating a portion of said housing in response to said signal from said detector means for producing an audible alarm, whereby said audible alarm is indicative of the presence of smoke. - View Dependent Claims (7, 8)
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Specification