Portable Device Drop Protection via Deployable Resilient Members
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Solution Overview
Problem
Portable electronic devices, such as mobile phones and PDAs, are prone to damage from accidental drops, which can affect both the outer appearance and underlying electrical circuits, highlighting a need for enhanced protection mechanisms.
Innovation Solution
The portable electronic device incorporates eight resilient members mounted in mounting holes, controlled by a module that includes a latching unit and an actuating unit with an electromagnet, magnetic member, and switch, which releases the resilient members to absorb impact when a sudden acceleration is detected, using an acceleration transducer, ADC, MCU, and memory to determine critical acceleration and secure time values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resilient members are continuously engaged to protect the device, then protection reliability is improved, but energy consumption increases and false activation occurs during normal movement
Solution Approach 1:
The resilient members are pre-positioned and latched in a ready state before impact occurs. The control module pre-charges the resilient members by engaging the latching members with the latching holes, so that when impact is detected via acceleration transducer, the members are already prepared to deploy immediately without requiring continuous energy input to maintain readiness.
Solution Approach 2:
The resilient members automatically deploy and retract without continuous external control. When impact is detected, the control module triggers the electromagnet to release the latching members, allowing the resilient members to self-expand via their elastic properties. After deployment, they automatically retract when the impact force subsides, eliminating the need for continuous energy consumption to maintain the protective state.
2Reliability
If resilient members are released to absorb impact, then damage protection is improved, but device complexity increases due to control mechanisms
Solution Approach 1:
The protection system is divided into eight independent resilient members distributed at different locations on the device housing. Each resilient member has its own latching mechanism and can deploy independently. This segmentation allows the complex protection function to be distributed across multiple simple, identical units, making the overall system more manageable and easier to control than a single complex protective mechanism.
Solution Approach 2:
The control module replaces complex continuous mechanical control systems with a simple electronic detection and control system. The acceleration transducer electronically detects impact conditions, and the control module uses an electromagnet to trigger deployment, substituting for elaborate mechanical linkages and switches. This reduces mechanical complexity while maintaining reliable control over the resilient members.
3Ease of manufacture
If the device uses a simple structure without protection mechanisms, then manufacturing ease is improved, but vulnerability to drop damage increases
Solution Approach 1:
The resilient members function as flexible elastic elements that can be integrated into the device housing structure. These flexible components provide impact absorption without requiring heavy rigid protective shells or complex structural modifications. The resilient members can be mounted in simple cylindrical cavities within the housing, maintaining a relatively simple overall device structure while adding significant protection capability.
Solution Approach 2:
The resilient members are pre-positioned and latched in a compressed ready state before impact occurs. This beforehand cushioning allows the device to have a compact appearance similar to unprotected devices, while the pre-loaded resilient members provide immediate protection when impact is detected, without requiring continuous bulky protective structures.
4Stability of the object's composition
If the latching mechanism is always engaged to hold resilient members, then structural stability is improved, but activation speed during impact decreases
Solution Approach 1:
The latching function is extracted from a continuous mechanical engagement system and separated into a discrete electronic control system. The electromagnet provides a strong holding force when engaged to maintain structural stability during normal operation. When impact is detected, the control module quickly de-energizes the electromagnet, allowing the latching members to be rapidly released by the elastic force of the resilient members themselves, achieving fast activation without compromising normal structural stability.
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
This solution effectively protects the device by releasing resilient members to absorb impact, reducing damage from falls by using a controlled mechanism that distinguishes between accidental movements and harmful drops, thereby enhancing the device's durability and reliability.
Implementation Method 1
using an acceleration transducer, ADC, MCU, and memory to determine critical acceleration and secure time values
Implementation Method 2
an actuating unit with an electromagnet, magnetic member, and switch, which releases the resilient members
Implementation Method 3
eight resilient members mounted in mounting holes, controlled by a module that includes a latching unit and an actuating unit with an electromagnet
Data Source
AI summary
A portable electronic includes a main body defining a plurality of mounting holes at corners; a plurality of mounting modules; a plurality of resilient members compressed and mounted in mounting holes of the main body by the corresponding mounting modules; and a control module. The control module includes a MCU; an acceleration transducer connected to the MCU to sample a real-time acceleration value, and a memory connected to the MCU to store a critical acceleration value. The control module controls the mounting modules to release the compressed resilient members so as to eject out the resilient members from the main body, when the real-time acceleration value is larger than the critical acceleration value.