Projector Theft Prevention Control Circuit
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Solution Overview
Problem
Conventional theft prevention devices for liquid crystal projectors can erroneously activate during shipping or transportation, causing unnecessary noise due to the alarm function being active from the factory to the user's initial use.
Innovation Solution
Incorporating a control circuit that invalidates the alarm function of the theft prevention unit before the device is shipped out of the factory, ensuring it remains inactive until the user starts using the projector, and using a rechargeable battery to maintain the unit in a low power consumption mode during transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the alarm function is activated from factory shipment to user use, then theft prevention coverage is maintained continuously, but erroneous activation during transportation causes unnecessary noise
Solution Approach 1:
The alarm function is made dynamically controllable through a switch that allows changing the alarm function between activated and deactivated states. This enables the system to adapt its security status based on operational context (transportation vs. user use), preventing erroneous activations during shipping while maintaining theft prevention during legitimate use.
2Reliability
If the alarm function remains active during transportation, then theft detection capability is maintained, but battery power is consumed unnecessarily
Solution Approach 1:
The switch enables dynamic control of the alarm function's power consumption state. During transportation, the alarm function can be deactivated to conserve battery power, while maintaining the ability to activate it when needed (upon user insertion of the projector into the case), thus optimizing energy usage without compromising security when required.
3Object-generated harmful factors
If the alarm function is deactivated before shipment, then erroneous activation is prevented, but theft prevention function is not available during transport
Solution Approach 1:
The switch is pre-set to deactivate the alarm function before shipment to prevent erroneous activations during transportation. However, the system includes a mechanism (user inserting projector into case) that can reactivate the alarm function before actual theft occurs, ensuring theft prevention is available when needed while avoiding false alarms during transport.
Data Source
AI summary
An image display device capable of preventing erroneous activation of the theft prevention function is provided. The image display device includes a theft prevention unit having an alarm function for preventing theft of the image display device, and a control circuit for controlling the theft prevention unit. The control circuit invalidates the alarm function of the theft prevention unit before the image display device is shipped out of a factory.