Interchangeable Lens Accessory Identification via Shared Terminals
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Solution Overview
Problem
Existing interchangeable lens camera systems require dedicated terminals for communication between the lens, camera body, and accessories, limiting the types of accessories that can be specified due to restricted input levels, necessitating additional junctions for effective operation.
Innovation Solution
A lens system with an interchangeable lens and accessory that uses shared terminals for bidirectional communication, where the accessory provides identification information upon request, allowing for accurate specification without dedicated terminals, and enables data communication based on synchronization and busy signal polarity switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated terminals are provided for communication between interchangeable lens and accessory, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the existing terminals serve multiple functions: they simultaneously handle power supply, bidirectional serial communication between camera body and lens, and identification communication between lens and accessory. This eliminates the need for dedicated identification terminals while maintaining communication reliability through the established terminal infrastructure.
Solution Approach 2:
The patent merges the identification communication function with the existing power supply and data communication terminals. By combining multiple communication purposes into shared terminals, the system reduces terminal quantity and complexity while ensuring reliable communication through the already-established electrical connection infrastructure.
2Manufacturing precision
If input level variation is limited for terminal specification, then manufacturing precision is improved, but adaptability decreases
Solution Approach 1:
The patent applies dynamics by implementing a dynamic identification process where the lens actively queries the accessory for its identification information through bidirectional communication. This dynamic approach allows the system to adapt to various accessory types without requiring predetermined input level specifications, enabling versatile accessory support while maintaining consistent terminal manufacturing.
Solution Approach 2:
The patent changes the identification parameter from static terminal input levels to dynamic communication-based identification. By using bidirectional serial communication to exchange identification information between lens and accessory, the system can recognize and adapt to diverse accessory types without being constrained by limited input level variations in the terminals.
Data Source
AI summary
Provided are a lens system, an accessory, a communication method, and a non-transitory recording medium readable by a computer for recording a program capable of accurately specifying an accessory without providing dedicated terminals for an interchangeable lens and the accessory. The lens system is a lens system including an interchangeable lens 100 and an accessory 300, the interchangeable lens includes a lens control unit that performs bidirectional data communication with the accessory necessary for acquisition of at least identification information of the accessory before starting data communication with the camera body, and the accessory includes an accessory control unit to which a power supply terminal and an input and output terminal among a plurality of signal lines are connected, and that replies with identification information of the accessory when the accessory control unit receives a request for acquisition of the identification information of the accessory from the interchangeable lens.