Mobile Projector Light Source Control via Acceleration Sensing
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Solution Overview
Problem
Mobile projector devices waste battery power due to unintentional illumination when users accidentally turn on the light source in bright environments, leading to battery drain and potential heat generation hazards.
Innovation Solution
Incorporating an acceleration measuring unit and a usage state detecting unit, such as an infrared sensor, to determine when the device is in an unused state, allowing for the reduction or extinction of the light source's output, thereby preventing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the light source is kept on for projection, then the projection function is available, but battery power is wasted when the device is accidentally stored in a pocket or bag
Solution Approach 1:
The acceleration sensor detects device acceleration in advance to predict when the device is being picked up or put down. By detecting acceleration patterns before the user actually uses the device, the system can proactively control the light source to turn on or off, preventing battery waste from unintentional illumination while ensuring the light is ready when needed
Solution Approach 2:
The system continuously monitors acceleration data and uses this feedback to dynamically adjust the light source state. The control unit processes real-time acceleration information to determine whether the device is in use or being stored, creating a closed-loop control system that automatically responds to user actions and prevents battery waste
2Use of energy by moving object
If the light source output is reduced in unused state, then battery power is conserved, but the device must accurately detect usage state to avoid premature shutdown
Solution Approach 1:
The device uses its own acceleration sensor to detect its own usage state without requiring external sensors or complex user input. The acceleration data from the device's motion itself provides sufficient information to determine whether the device is being used or stored, enabling the system to self-regulate power consumption based on its own operational context
Data Source
AI summary
A mobile projector apparatus includes a light source, a modulation unit modulating light of the light source using a picture signal, a projection lens magnifying and projecting the modulated light of the light source, a battery supplying electric power to the light source, an acceleration measuring unit measuring an acceleration applied to the mobile projector apparatus, a usage state detecting unit detecting whether or not the mobile projector apparatus is in an unused state, and an extinguishing unit extinguishing the light source based on outputs of the acceleration measuring unit and the usage state detecting unit.