Light-attenuation type fire detector assembly
First Claim
1. A light-attenuation type fire detector assembly which comprises a light emission drive section including a light emitter for radiating light having an intensity corresponding to an input signal level;
- a smoke detecting section including a light receiver which directly receives the light radiated from the light emission drive drive section and outpus a detection signal corresponding to the intensity of the light received by the light receiver;
a smoke amount computing section for computing the amount of smoke based on the detection signal from the smoke detecting section;
a delay circuit for retarding input of the detection signal from the smoke detecting section to the light emission drive section for a predetermined time; and
a control section for causing repeated operation of the light emission drive section, the smoke detecting section and the delay circuit, and generating a control signal after a predetermined period of time during which a predetermined number of such operations have been repeated;
the amount of smoke computed by said smoke amount computing section being based on the smoke detection signal input to said smoke amount computing section, such signal signifying the attenuation in the light received by the light receiver due to smoke between the light emitter and the light receiver.
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Accused Products
Abstract
A light-attenuation type fire detector assembly of the present invention comprises a light emission drive section including a light emitter for radiating light having an intensity corresponding to an input signal level; a smoke detecting section including a light receiver which directly receives the light radiated from the light emission drive section and is adapted to output a detection signal corresponding to the received light amount of the light receiver; a smoke amount computing section for computing the amount of smoke based on the detection signal from the smoke detecting section; a delay circuit for retarding input of the detection signal from the smoke detecting section to the light emission drive section for a predetermined time; and a control section for repeating the operations of the light emission drive section, the smoke detecting section and the delay circuit and generating a control signal after a predetermined period of time has been passed or a predetermined times of operation has been done to drive the smoke amount computing section, and wherein the amount of smoke is computed during a time when said smoke amount computing section is driven based on the smoke detection signal input to said smoke amount computing section to detect if there is attenuation in the radiated light due to smoke between the light emitter and the light receiver.
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Citations
18 Claims
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1. A light-attenuation type fire detector assembly which comprises a light emission drive section including a light emitter for radiating light having an intensity corresponding to an input signal level;
- a smoke detecting section including a light receiver which directly receives the light radiated from the light emission drive drive section and outpus a detection signal corresponding to the intensity of the light received by the light receiver;
a smoke amount computing section for computing the amount of smoke based on the detection signal from the smoke detecting section;
a delay circuit for retarding input of the detection signal from the smoke detecting section to the light emission drive section for a predetermined time; and
a control section for causing repeated operation of the light emission drive section, the smoke detecting section and the delay circuit, and generating a control signal after a predetermined period of time during which a predetermined number of such operations have been repeated;
the amount of smoke computed by said smoke amount computing section being based on the smoke detection signal input to said smoke amount computing section, such signal signifying the attenuation in the light received by the light receiver due to smoke between the light emitter and the light receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a smoke detecting section including a light receiver which directly receives the light radiated from the light emission drive drive section and outpus a detection signal corresponding to the intensity of the light received by the light receiver;
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11. A light-attenuation type fire detector assembly which comprises a light emission drive section including a light emitter for radiating light having an intensity corresponding to an input signal level;
- a smoke detecting section including a light receiver which directly receives the light radiated from the light emission drive section and outputs a detection signal corresponding to the intensity of the light received by the light receiver;
a delay circuit for retarding input of the detection signal from the smoke detecting section to the light emission drive section for a predetermined time; and
a control section for causing a predetermined number of repeated operations of the light emission drive section, the smoke detecting section and the delay circuit;
the detection of the attenuation in the radiated light due to smoke between the light emitter and the light receiver being based on the detection signal produced by the light receiver after said predetermined number of operations of the light emission drive section, the smoke detecting section and the delay circuit have been completed. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
- a smoke detecting section including a light receiver which directly receives the light radiated from the light emission drive section and outputs a detection signal corresponding to the intensity of the light received by the light receiver;
Specification