Viewfinder Display Layout for Photometry Accuracy
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Solution Overview
Problem
The display elements overlapping the focusing screen in imaging apparatuses affect photometry results, requiring frequent corrections when the focusing screen or display position is changed, which is inconvenient and can lead to errors.
Innovation Solution
A photometric apparatus with a first display unit that displays items outside the photometric range and a second display item with a smaller area inside the range, minimizing the impact on photometry results by optimizing the layout of display items within and outside the photometric range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a display element is arranged to overlap the focusing screen to display setting state, then the user can check settings while looking through the viewfinder, but the display affects the photometry result
Solution Approach 1:
The display screen is divided into a photometric range (first region) and a non-photometric range (second region). Display items are segmented and placed in the second region to avoid interfering with photometry, while still providing information to the user through the viewfinder.
Solution Approach 2:
Different regions of the display screen are assigned different functions: the first region (photometric range) is optimized for accurate light measurement, while the second region (non-photometric range) is optimized for displaying setting information. This local differentiation resolves the conflict between information display and measurement accuracy.
2Measurement precision
If correction is performed based on focusing screen type and display position, then photometry accuracy can be maintained, but the system becomes complex and requires frequent corrections when components are changed
Solution Approach 1:
The display items that cause photometry interference are extracted and placed outside the photometric range. This eliminates the need for complex correction calculations while maintaining both display functionality and measurement accuracy.
Solution Approach 2:
The display layout is preliminarily designed to place items in the non-photometric range, preventing photometry interference before it occurs. This proactive approach avoids the need for subsequent correction operations when components are changed.
3Loss of information
If display items are placed inside the photometric range, then more information can be displayed, but the photometry result is affected
Solution Approach 1:
The display layout utilizes the spatial dimension of the viewfinder, placing information in the non-photometric range (second region) rather than compromising the photometric range (first region). This dimensional arrangement preserves both information completeness and measurement accuracy.
Data Source
AI summary
A photometric apparatus includes a photometry unit (AE sensor) configured to measure object light, and a first display unit (intra-viewfinder liquid crystal display unit) arranged on an optical path of the object light to the photometry unit and configured to display a plurality of display items. The first display unit is configured to display a first display item (automatic white balance) among the plurality of display items in a position farther from a center of a photometry range by the photometry unit than a position of a second display item (incandescent lamp display) having a display area smaller than a display area of the first display item.