Light Source Package Housing Spacing for Infrared Safety
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Solution Overview
Problem
Light source packages used in portable devices for 3D sensing, such as smartphones, pose safety concerns due to the emission of intense infrared rays that can be concentrated on human faces, potentially causing injury.
Innovation Solution
A light source package design that includes a substrate, a light emitting device, a housing, and a conductive member, where the housing is spaced apart from the light emitting device and the lens, and the conductive member is electrically connected to the light emitting device, ensuring that if the housing is damaged or detached, the light emitting device stops operating, preventing high-intensity light from being emitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the housing is placed close to the light emitting device for compact design, then the device size is reduced, but the safety risk increases when the housing is damaged or detached
Solution Approach 1:
The patent implements a preliminary safety mechanism by spacing the housing away from the light emitting device and lens, creating a gap that allows the conductive member to make direct contact with the light emitting device. This preliminary arrangement ensures that if the housing becomes detached or damaged, the conductive member can immediately short-circuit the light emitting device to prevent harmful light emission, thus addressing the safety risk before it can materialize.
Solution Approach 2:
The patent introduces a conductive member as an intermediary element between the housing and the light emitting device. This conductive member serves as a safety mediator that can short-circuit the light emitting device when the housing is damaged, preventing intense light emission. The intermediary conductive member bridges the gap created by spacing the housing away, transforming the potential safety hazard into a controlled protective mechanism.
2Object-affected harmful factors
If the housing is spaced apart from the light emitting device and lens, then safety is improved by preventing light emission when damaged, but the device complexity increases
Solution Approach 1:
The patent implements a preliminary safety mechanism by spacing the housing away from the light emitting device and lens during the design phase. This predetermined spacing creates a controlled gap that allows the conductive member to directly contact the light emitting device, ensuring immediate short-circuit protection if the housing becomes detached. This preliminary arrangement simplifies the overall structure compared to complex active sensing systems while maintaining safety.
Solution Approach 2:
The patent employs a self-service safety mechanism where the conductive member automatically short-circuits the light emitting device when the housing is damaged or detached, without requiring external detection or control systems. The physical arrangement itself provides the safety function, eliminating the need for additional sensors, controllers, or complex monitoring circuits, thus reducing device complexity while maintaining effective safety protection.
3Object-affected harmful factors
If the conductive member is positioned to contact the light emitting device when housing is detached, then safety is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements preliminary positioning of the conductive member during the assembly process, where the conductive member is pre-configured to make contact with the light emitting device through the gap created by spacing the housing away. This preliminary arrangement establishes a predetermined contact path that simplifies manufacturing alignment compared to systems requiring precise active sensing and control mechanisms.
Solution Approach 2:
The patent creates an equipotential safety arrangement where the conductive member, light emitting device, and substrate are all electrically connected through controlled contact points. By establishing equipotential connections through the spaced housing design, the system ensures that any detachment of the housing automatically creates a short-circuit condition without requiring complex positioning adjustments, thereby reducing manufacturing precision requirements while maintaining safety effectiveness.
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
The design enhances safety by preventing the emission of high-intensity light when the housing is damaged or detached, thereby protecting users from potential eye injuries during facial recognition and other applications.
Implementation Method 1
A light source package may emit an infrared ray resulting from a reflection layer and a material included in a device of the light source package. The infrared ray may be generated by recombination of electrons and holes of combined semiconductors and amplified between upper and lower reflections layers.
Data Source
AI summary
A light source package includes a substrate, a light emitting device disposed on the substrate, a lens disposed on the light emitting device, a housing disposed on the substrate, and a conductive member disposed in the housing. The lens is spaced apart from the light emitting device, the housing is disposed on a side surface and a portion of a top surface of the lens, and the conductive member is electrically connected to the light emitting device.