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US09209222B2 Surveillance device 有权
监控设备

Surveillance device
摘要:
A surveillance device includes a circuit card assembly disposed in a housing and a plurality of light emitting diodes disposed on the circuit card assembly, each of the plurality of light emitting diodes configured to emit a narrow beam of light. The surveillance device further includes a diffuser disposed in the housing, the diffuser configured to spread the narrow beam of light and a Fresnel lens disposed in the housing, the Fresnel lens configured to spread and redirect light emitted from the diffuser.
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