Wireless Flash Control System Communication Collision Avoidance
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Solution Overview
Problem
In wireless multiple flash control systems, communication collisions occur due to the need to exchange charging state information during a shooting sequence, which complicates the timing of communication and can lead to failures in light emission control.
Innovation Solution
A light emitting system where a control apparatus wirelessly communicates with slave flashes to manage charging state information, transmitting a signal to stop charging state information once all flashes indicate completion, thereby preventing communication collisions and ensuring synchronized light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging state information is continuously transmitted during shooting sequence, then the image capture apparatus can monitor charging status, but communication collisions occur and control reliability deteriorates
Solution Approach 1:
The patent implements periodic action by having controlled light emitting apparatus transmit charging state information only at specific intervals or triggers (e.g., when charging status changes), rather than continuously. The light emission control apparatus sends requests at predetermined timings, and slave flashes respond only when necessary, converting continuous communication into periodic exchanges that avoid collisions while maintaining monitoring capability
Solution Approach 2:
The patent applies preliminary action by having the light emission control apparatus send a light emission request before actual light emission is needed. This allows slave flashes to prepare and report their charging status in advance, enabling the master to determine readiness before initiating the shooting sequence, thus preventing communication conflicts during critical emission timing
2Loss of information
If charging state information transmission continues until shooting, then charging status can be monitored, but transmission time and energy consumption increase
Solution Approach 1:
The patent extracts the essential charging state information transmission from continuous operation and isolates it to specific moments when the status changes or when requested by the master apparatus. This eliminates redundant transmissions during stable charging phases, reducing overall transmission time and energy consumption while preserving the ability to monitor charging status when it matters
Solution Approach 2:
The controlled light emitting apparatus autonomously determines when to transmit charging state information based on internal status changes (e.g., when charging completes or status transitions). This self-service approach eliminates the need for continuous polling by the master apparatus, significantly reducing transmission frequency and time loss while ensuring information is available when needed
Data Source
AI summary
A light emitting system in which a light emission control apparatus wirelessly communicates with at least one controlled light emitting apparatus, the controlled light emitting apparatus comprising a first transmission unit which wirelessly transmits charging state information to the light emission control apparatus, and the light emission control apparatus comprising a receiving unit which receives the charging state information from the controlled light emitting apparatus, an informing unit which informs the image capture apparatus that a charging operation is complete, a second transmission unit which transmits a signal to stop transmitting charging state information, and a third transmission unit which transmits a light emission command to the controlled light emitting apparatus.