Interchangeable Lens Interface Logic IC for Rapid Data Transmission
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Solution Overview
Problem
Conventional camera systems require additional time for data transmission between the camera body and interchangeable lenses due to the need for sending readout commands and addresses, which slows down the communication process.
Innovation Solution
The implementation of an interchangeable lens with an interface logic IC that allows direct data transmission of focal length and object distance to the camera body using fixed data set-pins and memory pages aligned with zoom and distance codes, enabling synchronized communication with the camera body via a clock signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the camera body sends readout commands and data addresses to the interchangeable lens for reading lens data, then the lens data can be read from the memory, but the communication time increases due to the additional transmission period
Solution Approach 1:
The patent applies preliminary action by pre-organizing lens data into pages corresponding to different focal length steps before communication occurs. The camera body can directly read the required page data without needing to send readout commands and addresses during communication, thereby reducing communication time while maintaining accurate data retrieval
Solution Approach 2:
The patent extracts only the necessary page data corresponding to the current focal length step from the lens memory, rather than transmitting all lens data or requiring complex address-based retrieval. This extraction approach minimizes communication overhead and time while ensuring accurate data delivery
2Adaptability or versatility
If the lens data is stored in memory and read out using paging method for each focal length step, then the data can be organized according to zoom positions, but the data transmission process requires additional command and address bytes
Solution Approach 1:
The patent creates a universal data structure where lens data is organized into standardized pages that can be directly accessed based on zoom position. This multi-functional approach allows the same memory structure to serve both data storage and direct data transmission purposes, eliminating the need for separate command and address protocols
Solution Approach 2:
The patent segments lens data into distinct pages corresponding to different focal length steps, allowing the camera body to directly access the specific page needed for the current zoom position without requiring complex addressing protocols. This segmentation simplifies the communication protocol while maintaining adaptability to different zoom positions
Data Source
AI summary
An interchangeable lens which can communicate with an associated camera body, the interchangeable lens including an interface logic IC; and a memory connected to the interface logic IC, and stores the data of the interchangeable lens. Fixed data of the interchangeable lens is allocated to a predetermined number of bytes of data sent from the interchangeable lens to the camera body so that terminals of the interface logic IC serve as at least one group of fixed data set-pins to which levels corresponding to the fixed data are set. In communication with the camera body for a predetermined number of bytes thereof, the interface logic IC reads the fixed data set by the group of fixed data set pins to send the read fixed data to the camera body, and sends data of the interchangeable lens which is read from the memory to the camera body.