Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A light transmission type smoke detector to give an alarm by sensing light attenuation due to smoke comprising: a light source, a photoelectric transducer means arranged to receive the light coming from the light source and to transduce the light into voltage, a first voltage-holding circuit connected to the photoelectric transducer means to receive an output voltage coming from the transducer means and to hold the voltage for a relatively short time, a second voltage-holding circuit connected to the photoelectric transducer means to receive the output voltage coming from the transducer means and to hold the voltage for a relatively long time, and a comparing circuit connected to the first voltage-holding circuit and the second voltage-holding circuit for comparing the output voltage coming from the first voltage-holding circuit with the output voltage coming from the second voltage-holding circuit to generate an output instantly when the output voltage coming from the first voltage-holding circuit falls lower than the output voltage coming from the second voltage-holding circuit.
Claim 2
Dependent Claim
165 words
A light transmission type smoke detector to give an alarm by sensing light attenuation due to smoke comprising: a light source, a photoelectric transducer means arranged to receive the light coming from the light source and to transduce the light into voltage, a first voltage-holding circuit connected to the photoelectric transducer means to receive an output voltage coming from the transducer means and to hold the voltage for a relatively short time, a second voltage-holding circuit connected to the photoelectric transducer means to receive the output voltage coming from the transducer means and to hold the voltage for a relatively long time, and a comparing circuit connected to the first voltage-holding circuit and the second voltage-holding circuit for comparing the output voltage coming from the first voltage-holding circuit with the output voltage coming from the second voltage-holding circuit to generate an output instantly when the output voltage coming from the first voltage-holding circuit falls lower than the output voltage coming from the second voltage-holding circuit.
Claim 3
Dependent Claim
83 words
The light transmission type smoke detector specified in claim 1 further comprising: a level-setting circuit for providing a predetermined voltage level and a second comparing circuit connected to said first voltage-holding circuit and the level-setting circuit for comparing the output voltage coming from the first voltage-holding circuit with the predetermined voltage level coming from the level-setting circuit to generate an output when the output voltage coming from the first voltage-holding circuit falls lower than the predetermined voltage level coming from the level-setting circuit.
Claim 4
Dependent Claim
41 words
The light transmission type smoke detector specified in claim 1 or 2, wherein the light source comprises one of light-emitting diode, tungsten filament lamp and luminescent diode and the photoelectric transducer means comprises one of photodiode, photocell, phototube, phototransistor and photoresistor.
Claim 5
Dependent Claim
27 words
The light transmission type smoke detector specified in claim 3, wherein the light source comprises a light emitting diode and the photoelectric transducer means comprises a photocell.
Claim 6
Dependent Claim
19 words
The light transmission type smoke detector specified in claim 3, wherein the photoelectric transducer means contains an amplifier circuit.
Claim 7
Dependent Claim
37 words
The light transmission type smoke detector specified in claim 1 or 2, wherein the first voltage-holding circuit and the second voltage-holding circuit each comprises a diode, a resistor, a capacitor, a field effect transistor and another resistor.
Claim 8
Dependent Claim
33 words
The light transmission type smoke detector specified in claim 1 or 2, wherein the time constant of the second voltage-holding circuit is set to be greater than that of the first voltage-holding circuit.
Claim 9
Dependent Claim
24 words
The light transmission type smoke detector specified in claim 2, wherein said level-setting circuit comprises serial connection of a resistor and a Zener diode.
Claim 10
Dependent Claim
33 words
The light transmission type smoke detector specified in claim 2, wherein said level-setting circuit comprises a serial connection of two resistors from the interconnecting point of which the predetermined voltage level is taken.