Fire Detector
First Claim
1. A fire detector, comprising:
- an optical case;
a light-receiving element provided in the optical case;
a received-light amplifying section for amplifying an output signal of the light-receiving element; and
a fire determination section for determining occurrence of a fire when a detection level obtained by A/D conversion of the amplified output signal is equal to or higher than a threshold value, wherein;
a signal line is connected to an element substrate on which the light-receiving element is mounted; and
the signal line passes through a slit formed through a peripheral wall of the optical case.
1 Assignment
0 Petitions
Accused Products
Abstract
Provided is a fire detector in which an element substrate can be easily removed from and mounted into an optical case. The fire detector includes: an optical case (21); an element substrate (31), on which a light-receiving element (12) is mounted, the element substrate (31) being provided in the optical case (21); a signal line (35) passing through an introduction portion of a peripheral wall (21a) of the optical case (21), the signal line (35) being connected to the element substrate (31); and an optical cover (30) for closing an opening of the optical case (21), in which the signal line (35) is inserted into a slit (37) which is open on an upper end surface (21f) of the introduction portion of the peripheral wall (21a).
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Citations
10 Claims
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1. A fire detector, comprising:
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an optical case; a light-receiving element provided in the optical case; a received-light amplifying section for amplifying an output signal of the light-receiving element; and a fire determination section for determining occurrence of a fire when a detection level obtained by A/D conversion of the amplified output signal is equal to or higher than a threshold value, wherein; a signal line is connected to an element substrate on which the light-receiving element is mounted; and the signal line passes through a slit formed through a peripheral wall of the optical case. - View Dependent Claims (3, 5)
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2. A fire detector, comprising:
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an optical case whose interior forms a dark box; an air passage constituting a smoke detection portion, for letting a gas flow into the optical case; a light-emitting element provided in the optical case; a light-receiving element for receiving scattered light generated by scattering of light emitted from the light-emitting element by smoke particles present in the smoke detection portion; a received-light amplifying circuit for amplifying an output signal of the light-receiving element; and a fire determination section for determining occurrence of a fire when a detection level obtained by A/D conversion of the amplified output signal is equal to or higher than a threshold value, wherein; a signal line is connected to an element substrate on which one of the light-emitting element and the light-receiving element is mounted; and the signal line passes through a slit formed through a peripheral wall of the optical case. - View Dependent Claims (4, 6)
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7. A fire detector, comprising:
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an optical case; a light-receiving element provided in the optical case; a received-light amplifying section for amplifying an output signal of the light-receiving element; and a fire determination section for determining occurrence of a fire when a detection level obtained by A/D conversion of the amplified output signal is equal to or higher than a threshold value, wherein; an outer surface of the optical case has conductivity; and a signal-line retaining portion for bringing a signal line connected to an element substrate, on which the light-receiving element is mounted, into contact with the outer surface is provided to the optical case. - View Dependent Claims (9)
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8. A fire detector, comprising:
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an optical case whose interior forms a dark box; an air passage constituting a smoke detection portion, for letting a gas flow into the optical case; a light-emitting element provided in the optical case; a light-receiving element for receiving scattered light generated by scattering of light emitted from the light-emitting element by smoke particles present in the smoke detection portion; a received-light amplifying circuit for amplifying an output signal of the light-receiving element; and a fire determination section for determining occurrence of a fire when a detection level obtained by A/D conversion of the amplified output signal is equal to or higher than a threshold value, wherein; an outer surface of the optical case has conductivity; and a signal-line retaining portion for bringing a signal line connected to an element substrate, on which the light-receiving element is mounted, into contact with the outer surface is provided to the optical case. - View Dependent Claims (10)
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Specification