Focus Adjustment Apparatus Phase Difference Detection
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Solution Overview
Problem
In camera systems with multiple autofocus frames, users cannot reliably determine which frame is in focus, leading to uncertainty about whether the intended target is optimally focused.
Innovation Solution
A focus adjustment apparatus that displays the in-focus state by controlling the focus lens position based on phase difference detection results, allowing users to visually recognize the focused object by dividing the focus detection region and displaying the in-focus state in corresponding display regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of AF frames is increased to enhance AF performance, then focus detection capability is improved, but the user cannot determine which frame is in focus leading to loss of information
Solution Approach 1:
The patent applies visual indication changes (displaying different states or highlights) to AF frames based on their focus status. The in-focus AF frame is visually distinguished from out-of-focus frames, allowing users to immediately identify which frame corresponds to the focused object without losing information about the focus state.
2Area of stationary object
If multiple AF frames are arranged in high density to increase coverage, then area of detection is improved, but display clarity deteriorates making it difficult for users to recognize the focused object
Solution Approach 1:
The patent uses visual differentiation (such as highlighting or changing display states) of AF frames based on their focus status. This allows multiple densely arranged frames to remain visually distinguishable, with the in-focus frame clearly indicated to maintain ease of operation and user recognition despite high-density arrangement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances user reliability in determining the focused object by accurately displaying the in-focus state for each autofocus frame, ensuring optimal focus on the intended target.
Implementation Method 1
a light flux from an object, having passed through different exit pupil regions of a photographic lens, is caused to form an optical image on each of a pair of line sensors, and photoelectrically converted into a pair of object images
Data Source
AI summary
A focus adjustment apparatus that displays an in-focus state in a display region in association with control of a focus lens position. The apparatus includes a signal generation unit configured to output a pair of image signals from a focus detection region having a plurality of corresponding display regions, the image signals being generated by photoelectrically converting light having passed through an imaging optical system, and a control unit configured to detect a phase difference of the pair of image signals output from the focus detection region, and to control a position of the focus lens based on the phase difference detection result. The control unit detects the phase difference corresponding to divided regions formed by dividing the focus detection region, and displays an in-focus state in the display region in accordance with the control of the focus lens position control based on the phase difference detection result.