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US 2025/0093248 A1Published application
Smoke detector with light source illuminating toward light sensor
AssigneePixart Imaging Inc.
InventorsYen-Chang Chu, Cheng-Nan Tsai, Chih-Ming Sun
Life of this patent
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Abstract
There is provided a smoke detector including a substrate, a light source and a light sensor. The light source and the light sensor are arranged adjacently on the substrate. The substrate is arranged with an asymmetric structure to cause an illumination region of the light source to deviate toward the light sensor thereby increasing a ratio of light intensity reflected by smoke with respect to reference light intensity.
Claims18
A smoke detector, comprising:
- a substrate;
- a light source, arranged on an upper surface of the substrate;
- a ring wall, arranged on the upper surface of the substrate, and comprising an accommodation space for accommodating the light source therein, and an opening connecting to the accommodation space and opposite to the light source, wherein a cross section of the opening is smaller than that of the accommodation space;
- and
- a light sensor, arranged on the upper surface of the substrate.
2 more elements
A smoke detector, comprising:
- a substrate;
- a light source, arranged on an upper surface of the substrate;
- a ring wall, arranged on the upper surface of the substrate and surrounding the light source, wherein a first part of the ring wall farther from the light sensor has a height more than that of a second part of the ring wall closer to the light sensor;
- a light sensor, arranged on the upper surface of the substrate;
- a lens, arranged on the upper surface of the substrate and covering the light source, and an optical axis thereof being tilted toward the light sensor;
- and
- a light reflecting element, arranged on the first part of the ring wall and facing the lens.
4 more elements
A smoke detector, comprising:
- a substrate;
- a light sensor, arranged on an upper surface of the substrate;
- a sub-substrate, arranged on the upper surface of the substrate and electrically connected to the substrate, wherein a first surface of the sub-substrate is tilted toward the light sensor;
- a light source, arranged on the first surface of the sub-substrate;
- and
- a ring wall, arranged on the upper surface of the substrate and surrounding the sub-substrate.
3 more elements
Dependencies are inferred from the claim text.