Interchangeable Lens Contact Arrangement for Signal Interference Reduction
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Solution Overview
Problem
Existing camera systems with interchangeable lenses face interference between two independent communication systems, which can adversely affect each other's performance during simultaneous communication.
Innovation Solution
The design incorporates a holding unit with multiple contacts arranged in a specific configuration, including separate communication contact systems and power source contact systems, to minimize interference between clock signal, data signal, and asynchronous signal communications, allowing one communication system to function even when the other is in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two independent communication systems are arranged in the holding unit, then communication versatility is improved, but communication stability deteriorates due to mutual interference between the systems
Solution Approach 1:
The holding unit is divided into multiple independent contact groups, with each group dedicated to a specific communication system. The first contact group handles the first communication system while the second contact group handles the second communication system, physically separating the signal paths to prevent mutual interference and ensure stable communication.
Solution Approach 2:
A ground contact is introduced as an intermediary element between the first and second contact groups. This ground contact acts as a shield and reference potential, isolating the two communication systems electrically and preventing signal interference while allowing both systems to operate simultaneously.
2Device complexity
If communication contacts are arranged closely to maximize space utilization, then device compactness is improved, but communication reliability deteriorates due to increased interference between contacts
Solution Approach 1:
The ground contact serves as a protective intermediary positioned between the communication contacts. Even when contacts are arranged closely for compactness, the ground contact provides electrical isolation and shielding, preventing interference between adjacent communication signals while maintaining the compact overall structure.
Solution Approach 2:
Different regions of the holding unit are assigned different functional qualities. Communication contacts are positioned for optimal signal transmission, while ground contacts are strategically placed in intermediate positions to provide local shielding and reference potentials, creating zones of electrical stability throughout the compact structure.
3Ease of manufacture
If power source contacts are positioned near communication contacts, then manufacturing simplicity is improved, but communication quality deteriorates due to electromagnetic interference from power signals
Solution Approach 1:
The ground contact acts as a protective barrier positioned between power source contacts and communication contacts. This intermediary ground element shields the sensitive communication signals from electromagnetic interference generated by power signals, allowing simple manufacturing layouts while maintaining high communication quality.
Solution Approach 2:
The holding unit creates distinct electrical environments: communication contacts are positioned in zones shielded by ground contacts from power source contacts. This local quality differentiation ensures that power signals and communication signals operate in electrically isolated regions, preventing interference while allowing compact overall design.
Data Source
AI summary
An interchangeable lens that is detachably attached to a camera body and that includes a holding unit at which a plurality of contacts is arranged, includes: a first contact group that includes a plurality of the contacts, arranged at the holding unit, through which a first data communication is performed with the camera body in a first period; a second contact group that includes a plurality of the contacts, arranged at the holding unit, through which a second data communication is performed with the camera body in a second period that is shorter than the first period; and a power source contact arranged at the holding unit, through which operation voltages for the first and second data communications are supplied to the interchangeable lens from the camera body. The first contact group is arranged at a position closer to the power source contact than the second contact group.