PHOTOELECTRIC SMOKE SENSOR AND ELECTRONIC EQUIPMENT
First Claim
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1. A photoelectric smoke sensor comprising:
- a casing having a smoke detecting section into which smoke is introduced and a labyrinth section located around the smoke detecting section to block light traveling from outside of the smoke detecting section toward the smoke detecting section while allowing smoke to flow from outside of the smoke detecting section into the smoke detecting section;
a light-emitting section emitting light to the smoke detecting section; and
a light-receiving section receiving scattered light scattered by smoke in the smoke detecting section,wherein the casing has a bottom cover section in which a plurality of holes are formed, the holes preventing insects from entering the smoke detecting section from outside while allowing smoke to flow into and out of the smoke detecting section.
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Abstract
In a photoelectric smoke sensor, a casing has a bottom cover section in which a plurality of holes are formed. The bottom cover section having the holes has a function of allowing smoke to flow into and out of a smoke detecting section and preventing insects from entering the smoke detecting section from outside of the smoke detecting section. Thus, smoke is smoothly introduced from the lower side of the smoke detecting section into the smoke detecting section and there is no necessity of installing a large insect screen at the entrance of smoke flowing from the outside.
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Citations
10 Claims
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1. A photoelectric smoke sensor comprising:
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a casing having a smoke detecting section into which smoke is introduced and a labyrinth section located around the smoke detecting section to block light traveling from outside of the smoke detecting section toward the smoke detecting section while allowing smoke to flow from outside of the smoke detecting section into the smoke detecting section; a light-emitting section emitting light to the smoke detecting section; and a light-receiving section receiving scattered light scattered by smoke in the smoke detecting section, wherein the casing has a bottom cover section in which a plurality of holes are formed, the holes preventing insects from entering the smoke detecting section from outside while allowing smoke to flow into and out of the smoke detecting section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification