Lens Interchangeable Camera Exposure Correction
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Solution Overview
Problem
In lens-interchangeable type digital cameras, exposure deviation occurs due to diaphragm and brightness errors when switching between different interchangeable lenses, especially in compact designs with small image sensors, making it difficult to correct for F-number dependence of sensitivity.
Innovation Solution
An imaging apparatus with a lens-interchangeable type body and interchangeable lenses that store individual brightness difference information and sensitivity change data, using a control system to correct exposure by reading this information for accurate image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a compact interchangeable lens system is used, then the device size is reduced, but exposure deviation occurs due to diaphragm and brightness errors
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing the actual brightness values of each interchangeable lens in a storage unit during manufacturing. When a lens is mounted, the control unit retrieves the stored brightness information and uses it for exposure correction, eliminating the need for real-time measurement and ensuring accurate exposure from the start.
Solution Approach 2:
The patent implements feedback by using the stored brightness information of each lens to automatically adjust and correct exposure settings. The control unit continuously references the pre-measured brightness data to compensate for individual lens variations, creating a closed-loop system that maintains exposure accuracy across different lenses.
2Adaptability or versatility
If different interchangeable lenses are used, then versatility is improved, but exposure deviation occurs due to individual brightness differences
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing the actual brightness values of each interchangeable lens in a storage unit during manufacturing. When a lens is mounted, the control unit retrieves the stored brightness information and uses it for exposure correction, eliminating the need for real-time measurement and ensuring accurate exposure from the start.
Solution Approach 2:
The patent applies parameter changes by adjusting the exposure parameters based on the specific brightness characteristics of each mounted lens. The control unit modifies exposure settings according to the retrieved brightness information, allowing each lens to operate with optimized parameters that compensate for individual manufacturing variations.
3Measurement precision
If F-number dependent sensitivity correction is applied, then imaging accuracy is improved, but complexity increases due to additional correction data requirements
Solution Approach 1:
The patent merges the F-number dependent sensitivity correction data with the lens brightness information in a unified correction approach. By combining these correction elements, the system reduces the number of separate correction mechanisms needed while achieving comprehensive exposure accuracy.
Solution Approach 2:
The patent creates a universal correction system that handles both lens-specific brightness variations and F-number dependent sensitivity changes through a single integrated approach. The storage unit and control unit work together to manage multiple correction types using the same basic infrastructure, reducing overall system complexity.
Data Source
AI summary
An imaging apparatus includes: a lens-interchangeable type imaging apparatus body which includes a solid-state imaging device; and an interchangeable lens as defined herein; and the interchangeable lens is provided with a first storage portion which stores individual difference information about brightness of the interchangeable lens; and the lens-interchangeable type imaging apparatus body is provided with a second storage portion which stores information about a change of incident light sensitivity of the solid-state imaging device relative to each diaphragm value, and a control portion which uses the individual difference information about the brightness read from the first storage portion of the mounted interchangeable lens and the information about the change of the sensitivity in the second storage portion to thereby correct exposure at a time of imaging the photographic subject.