Projector Sliding-Cover Detection for False Power-On Prevention
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Solution Overview
Problem
Existing projector power control methods, particularly for portable devices, suffer from false triggering due to friction or pressure in bags, leading to power wastage, poor heat dissipation, and safety hazards, and existing fool-proof designs compromise user experience.
Innovation Solution
A projector design incorporating a target sensor, such as a ranging sensor with multiple components, and a driving mainboard to control power states based on signal reception from these components, ensuring accurate power-on and power-off states by detecting the position of a sliding cover relative to the lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a button or remote control is used to trigger the projector to power on, then the projector can be easily controlled, but the button is easily triggered by pressing in the bag causing false power-on
Solution Approach 1:
The patent replaces the mechanical button-pressing system with an optical detection system. The target sensor emits light signals and detects their reflection to determine the sliding cover position, substituting mechanical contact with optical field interaction to eliminate false triggering from accidental button presses in the bag.
Solution Approach 2:
The patent introduces an optical signal as an intermediary between the user's intent and the power control system. The target sensor uses light signals to indirectly detect the sliding cover position and trigger power state changes, rather than direct mechanical contact, serving as a mediator that prevents false activation.
2Reliability
If fool-proof design is added such as pressing the button twice consecutively or for a long time, then false triggering is prevented, but user experience is poor under normal use
Solution Approach 1:
The patent performs preliminary detection of the sliding cover position using the target sensor before allowing power-on. The system checks the optical signal reflection status in advance to confirm the cover is open, preventing false power-on before it can occur, rather than requiring multiple button presses after the fact.
Solution Approach 2:
The patent replaces the multi-press mechanical verification system with an optical detection system that automatically verifies the sliding cover position. The target sensor's light reflection detection serves as the preliminary verification mechanism, eliminating the need for cumbersome multiple button presses.
3Adaptability or versatility
If the projector is placed in a small space such as a bag, then portability is improved, but items in the bag rub or squeeze each other triggering false power-on and heat dissipation becomes poor
Solution Approach 1:
The patent replaces mechanical pressure-sensitive triggers with optical detection. The target sensor uses light reflection to detect sliding cover position, which is not affected by pressure or friction from items in the bag, eliminating false power-on while maintaining portability.
Solution Approach 2:
The patent introduces optical signals as an intermediary that is insensitive to mechanical pressure and friction. The light-based detection system mediates between the physical environment in the bag and the power control system, preventing false triggering from item-to-item contact while preserving the portable design.
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
Reduces false triggering and improves user experience by accurately determining the projector's power state based on the sliding cover's position, preventing power-on in confined spaces and enhancing safety and efficiency.
Implementation Method 1
a target sensor configured to collect signals from one end of the projector cabin where the opto-mechanical lens is arranged and one end of the projector cabin away from the opto-mechanical lens
Implementation Method 2
the target sensor is a ranging sensor and includes three components, wherein any two of the components are arranged in a preset range from two sides of the opto-mechanical lens respectively
Data Source
Figure 1
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AI summary
The present application provides a projector, including: a projector cabin; an opto-mechanical lens arranged at one end of the projector cabin; a sliding cover arranged in front of the opto-mechanical lens; a target sensor configured to collect signals from one end of the projector cabin where the opto-mechanical lens is arranged and one end of the projector cabin away from the opto-mechanical lens; and a driving mainboard connected to the target sensor and configured to control a working state of the projector based on the signals, wherein the working state includes a power-on state and a power-off state. The present application controls the working state by arranging the target sensor in conjunction with the sliding cover. The target sensor collects signals from one end of the projector cabin where the opto-mechanical lens is arranged and one end of the projector cabin away from the opto-mechanical lens. One signal is obtained when the sliding cover is at one end of the projector cabin away from the opto-mechanical lens, and another signal is obtained when the sliding cover is at one end of the projector cabin where the opto-mechanical lens is arranged, so that the driving mainboard controls the working state based on the signals, which greatly reduces an occurrence of false triggering and improves user experience. The present application further provides a method for controlling a projector to power on or off, which has the above-mentioned beneficial effects.