Phase Difference AF Correction Display for Lens Wear Compensation
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Solution Overview
Problem
Conventional single lens reflex cameras with phase difference AF face accuracy issues due to lens and camera body wear, leading to incorrect in-focus positions, requiring manual adjustment and lacking clear correction methods for focal length and focus position variations.
Innovation Solution
A display apparatus for image pickup apparatuses that displays lens information, including focal length and focus position, with a scale and indicator for setting correction values specific to focal length and focus position, allowing users to easily adjust and confirm correction values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single correction value is set for one lens, then the device complexity is reduced, but the measurement precision of focusing accuracy deteriorates when focal length or focus position changes
Solution Approach 1:
The patent segments the correction value setting by dividing it into multiple focal length ranges (e.g., first focal length range and second focal length range). Each range has its own correction value that can be independently set and displayed. This allows the system to provide focal length-specific correction values without requiring a single complex correction mechanism, thereby maintaining measurement precision across different focal lengths while avoiding excessive device complexity.
2Ease of operation
If correction values are not displayed clearly by focal length, then the ease of operation is improved, but the loss of information increases as users cannot set proper correction values for different focal lengths
Solution Approach 1:
The patent employs color changes in the display to indicate different focal length ranges and their corresponding correction values. The display unit shows correction values with color coding that corresponds to specific focal length ranges, making it visually intuitive for users to understand which correction value applies to which focal length. This maintains ease of operation through visual clarity while preventing information loss about focal length-specific corrections.
Solution Approach 2:
The patent adds a visual dimension to the correction value display by using color-coded indicators that represent different focal length ranges. This dimensional addition to the display allows users to quickly distinguish between correction values for different focal lengths without complicating the operational interface, thereby preserving both ease of operation and complete information delivery.
3Reliability
If manual readjustment at service center is required, then the reliability of focusing is maintained through professional calibration, but the loss of time and ease of repair deteriorate due to the need to transport the camera
Solution Approach 1:
The patent implements a self-service correction system where users can independently set and adjust correction values for different focal length ranges through the camera's display unit. The system provides interfaces that allow users to input correction values, view them in color-coded displays, and save settings without requiring professional service center intervention. This maintains focusing reliability through accurate correction while eliminating time loss and inconvenience associated with transporting the camera to service centers.
Solution Approach 2:
The patent enables users to perform preliminary correction value setting and adjustment before actual shooting sessions. By providing a user-friendly interface with color-coded displays that show correction values for different focal length ranges, the system allows users to pre-calibrate their cameras according to their specific needs and shooting conditions, eliminating the need for time-consuming service center visits and enabling immediate use of corrected focusing.
Data Source
AI summary
The present invention is intended to display information of a focal length to be corrected or a focus position of a lens on a screen so that the user easily set a proper correction value even when the correction value of the in-focus position of the phase difference AF is different depending on the focal length or the focus position. A display apparatus of an image-pickup apparatus includes a lens information display 510, 531 configured to display lens information including at least one of information relating to a focal length of a lens unit and information relating to a focus position, a scale 503 that represents a correction value for correcting an in-focus position of a phase difference AF, and an indicator 520a-c, 530a-c that is used for setting the correction value corresponding to at least one of the focal length and the focus position.