Focus Detection Sensor Parallel Output Multiplexer
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Solution Overview
Problem
Existing focus detection devices face challenges in efficiently reading data from multiple focus detection portions without increasing reading time, especially when the amount of data becomes large.
Innovation Solution
A focus detection device that uses a focus detection sensor with parallel output terminals, a multiplexer to arrange data in series order, and an A/D converter to convert analog data into digital data, allowing for high-speed reading of data from multiple focus detection portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of focus detection portions is increased to detect focus states at multiple points, then the measurement precision and coverage are improved, but the reading time and data processing time increase
Solution Approach 1:
The focus detection sensor is divided into multiple independent focus detection portions (e.g., 8 portions: 701-708), each capable of parallel operation. This segmentation allows simultaneous data acquisition from multiple focal points without sequential processing delays, resolving the contradiction between enhanced measurement precision and increased reading time.
Solution Approach 2:
Multiple focus detection portions are merged into a single integrated sensor structure with common readout circuitry. The outputs of all focus detection portions are combined and processed together through shared selection means and processing circuits, enabling parallel data acquisition while maintaining unified control and reducing overall processing time.
2Adaptability or versatility
If more focus detection portions are used to cover a larger field of view, then the adaptability and functionality are improved, but the device complexity and data processing burden increase
Solution Approach 1:
The focus detection sensor is designed with universal, identical circuit structures for each focus detection portion. Each portion uses the same photodetector array configuration and readout circuitry, allowing the system to handle multiple focal points with a standardized, scalable architecture rather than requiring complex custom designs for each portion.
Solution Approach 2:
Selection means (multiplexer) act as intermediary components between the multiple focus detection portions and the processing circuits. These intermediaries selectively route signals from different focus detection portions to the processing stage, simplifying the overall system architecture by providing a standardized interface layer that manages the complexity of multiple parallel channels.
Data Source
AI summary
The present invention discloses a focus detection device capable of reading a plurality of focus detection outputs in parallel. As an exemplary structure, the focus detection device includes a focus detection sensor having a plurality of output terminals for outputting, in parallel, analog data corresponding to focus states of multiple points in the field of a viewfinder, a multiplexer for arranging and outputting, in series order on the one terminal, the analog data output in parallel from the plurality of output terminals of the focus detection sensor, and an A/D converter for converting, to digital data, the analog data arranged in series order on the one terminal through and output from the multiplexer.