Projector Slidable Lens Shutter Power Control
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Solution Overview
Problem
Existing projectors do not simultaneously achieve the image mute function and the prevention of unintentionally leaving the lens shutter open during power off, leading to potential damage from accidental transport.
Innovation Solution
A projector with a shutter position detection unit that turns off the power source when the shutter is held in a predetermined position for a period, allowing for cancellation of accidental power-off or power-on operations, and includes a notification unit to alert users of shutter positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power source is turned off in synchronization with the closure of the lens shutter, then the prevention of unintentional transport with open lens is improved, but the image mute function and simultaneous unclosed lens shutter prevention are not achieved
Solution Approach 1:
The control unit performs preliminary action by turning off the power source after a predetermined time period following shutter closure, rather than immediately synchronizing with the shutter action. This time delay allows the system to first detect that the shutter is properly closed, then execute the power-off operation, ensuring both the image mute function and prevention of unintentional transport are achieved simultaneously.
2Reliability
If the power source is turned off immediately upon shutter closure, then the unclosed lens shutter prevention is improved, but accidental open/close operation of the lens shutter is followed by on/off action of the power source
Solution Approach 1:
The control unit implements a time delay mechanism that waits for a predetermined period after shutter closure before executing the power-off operation. This preliminary delay allows accidental or unintended shutter operations to be detected and corrected by the user before the power state changes, preventing unintended power-on/off actions while maintaining reliable lens shutter protection.
3Ease of operation
If the power source is turned off after a predetermined time period following shutter closure, then the cancellation of accidental power-off operation is improved, but the device complexity increases
Solution Approach 1:
The control unit automatically manages the power state based on shutter position detection without requiring additional user input or complex external control mechanisms. The system self-regulates by monitoring shutter closure, implementing the predetermined time delay, and automatically turning off the power source, thereby achieving accidental operation cancellation while maintaining relatively simple device architecture.
Data Source
AI summary
A projector can not only perform power on/off operation in synchronization with open/close action of a shutter but also provide a screen mute function achieved by the shutter. When the shutter is located in an OFF position and the period timed by a timer is longer than or equal to a predetermined period during the operation of the projector, the projector is powered off. In this process, after the timing operation performed by the timer and notification from a notification unit are terminated, a light source is turned off and the projector is caused to enter a standby state.