Diaphragm Driving Control for Noise Reduction in Imaging Apparatus
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Solution Overview
Problem
Current imaging apparatuses do not adequately address the reduction of driving sound generated by the diaphragm mechanism, which can be disruptive in quiet environments and affect image capture in sensitive situations.
Innovation Solution
An imaging apparatus with a mode setting unit that selects between a first and second diaphragm driving mode, where the second mode limits diaphragm driving more significantly, and a diaphragm control unit that adjusts diaphragm driving based on the brightness of the imaging target, including controlling the diaphragm driving speed to reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the diaphragm mechanism is driven at high speed to improve response time and productivity, then the imaging speed and productivity are improved, but the driving sound increases which is harmful in quiet environments
Solution Approach 1:
The patent applies dynamics by making the diaphragm driving speed variable rather than fixed. The control unit dynamically adjusts the driving speed based on the set diaphragm value, achieving faster driving for certain aperture ranges and slower driving for others to reduce sound, thus resolving the contradiction between productivity and harmful factors
Solution Approach 2:
The patent changes the parameter of diaphragm driving speed based on the diaphragm value. By setting different driving speeds for different aperture ranges (e.g., faster for F5.6-F16, slower for F1.4-F4), the system optimizes both imaging speed and noise reduction, resolving the technical contradiction
2Object-generated harmful factors
If the diaphragm driving mode is limited to reduce driving sound, then the harmful factors are reduced, but the diaphragm response capability may be compromised
Solution Approach 1:
The patent applies local quality by implementing different diaphragm driving modes for different aperture ranges. The first mode (more limited driving) is applied to ranges where sound reduction is prioritized, while the second mode (less limited driving) is applied to ranges where response capability is more critical, thus resolving the contradiction locally across different operating conditions
Data Source
AI summary
Provided is an imaging apparatus including a mode setting unit that sets a diaphragm driving mode out of a plurality of diaphragm driving modes including a first diaphragm driving mode and a second diaphragm driving mode in which diaphragm driving is more limited than in the first diaphragm driving mode, and a diaphragm control unit that controls diaphragm driving in accordance with brightness of an imaging target in a case where the mode setting unit sets the second diaphragm driving mode.