Sensor Light Shielding Component Blocks Infrared Radiation

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Solution Overview

Problem

Existing LED sensor lights often experience false triggering due to infrared radiation generated by the heat dissipation of the light emitting module, which is detected by the embedded passive infrared (PIR) sensor.

Innovation Solution

Incorporating a shielding component between the sensor module and the light emitting module to prevent infrared radiation from reaching the sensor, with the shielding component positioned at a lower horizontal level than the sensor module and extending beyond the light emitting module's highest horizontal level, and optionally using a Fresnel lens to concentrate incoming infrared light for the sensor module.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a light emitting module is used to provide illumination, then lighting function is improved, but infrared radiation from heat dissipation causes false triggering of the sensor module

Engineering Contradiction:

Improvelighting functionVSAvoidsensor triggering accuracy

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

A shielding component is introduced as an intermediary element between the light emitting module and the sensor module. This shielding component selectively blocks infrared radiation from reaching the sensor while allowing visible light to pass through, thus preventing false triggering without compromising the lighting function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The shielding component is designed with specific optical properties that differentiate its behavior for different wavelengths of light. It exhibits high opacity to infrared radiation (from heat dissipation) while maintaining transparency to visible light (from the light emitting module), creating local quality differentiation in the optical path.

Inventive Principle:

Principle #3Local quality

2Reliability

If the shielding component is positioned to block infrared radiation, then sensor false triggering is reduced, but the structure becomes more complex

Engineering Contradiction:

Improvesensor triggering accuracyVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The shielding component serves multiple functions simultaneously: it blocks infrared radiation to prevent false triggering, maintains structural integrity of the device, and can be integrated into the existing housing or assembly process. This multi-functionality reduces the need for additional separate components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The shielding component is merged with the existing device structure, either as part of the housing or integrated into the assembly process. This consolidation approach combines the shielding function with the structural framework, avoiding the need for completely separate shielding structures.

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Effectively prevents false triggering of the sensor light by reducing or eliminating infrared radiation from the light emitting module's heat dissipation, ensuring accurate detection of human presence and reducing energy waste.

Implementation Method 1

The shielding component is disposed between the sensor module and the light emitting module, and configured to shield the sensor module from radiation of infrared light generated by the light emitting module

Methodology Applied

Scientific EffectInfrared radiation blocking: Absorption (EM radiation)

Implementation Method 2

the sensor light further includes a Fresnel lens configured to cover the sensor module and concentrate the incoming infrared light for the sensor module

Methodology Applied

Scientific EffectLight concentration: Fresnel Lens

Implementation Method 3

The sensor module is configured to measure incoming infrared light radiated to the sensor module, and generate a trigger signal when the measured infrared light meets a preset condition

Methodology Applied

Scientific EffectInfrared detection: Infrared Radiation

Data Source

PatentUS11029010B2Sensor light and a system for preventing false triggering of a sensor

Publication Date: 2021.06.08 ZHEJIANG SHENGHUI LIGHTING

AI summary

The present disclosure provides a sensor light and a system for preventing false triggering of a sensor. The sensor light includes a sensor module, a light emitting module, a power drive circuit, and a shielding component. The sensor module is configured to measure incoming infrared light radiated to the sensor module, and generate a trigger signal when the measured infrared light meets a preset condition. The light emitting module is configured to emit light. The power drive circuit is connected to the sensor module and the light emitting module, and configured to receive the trigger signal from the sensor module, and control the light emitting module to emit light in response to the trigger signal. The shielding component is disposed between the sensor module and the light emitting module, and configured to shield the sensor module from radiation of infrared light generated by the light emitting module.