Imaging Device Focusing Assistance Speed Control
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Solution Overview
Problem
Existing imaging devices with manual focus capabilities face challenges in achieving a natural and comfortable focusing assistance, especially when using old lenses or when quick focusing is required, as existing technologies either do not consider focus adjustment speed or require manual operation of the AF button.
Innovation Solution
An imaging device equipped with a focusing assistance unit that adjusts the image sensor's movement based on the focus adjustment speed detected by the imaging lens, ensuring the sum of the focus adjustment speeds by both the lens and sensor remains below a threshold, thereby assisting in achieving an in-focus state without discomfort to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the focusing assistance unit moves the image sensor to achieve in-focus state, then focusing assistance is provided, but the user feels uncomfortable due to unnatural viewfinder and live view display during focusing
Solution Approach 1:
The patent applies dynamics by making the image sensor movement speed variable rather than fixed. The control unit adjusts the sensor movement speed dynamically based on the detected lens focus adjustment speed, ensuring the combined speed remains natural and comfortable for the user while still providing effective focusing assistance.
2Measurement precision
If the AF button is operated to perform contrast AF, then focusing is achieved, but quick focusing cannot be performed and it does not effectively function when a moving body is captured
Solution Approach 1:
The patent applies preliminary action by starting the image sensor movement in advance based on the detected lens focus adjustment speed before the user completes manual focusing. This preliminary movement of the sensor prepares the system for quick focusing, allowing the camera to rapidly achieve focus on moving bodies without requiring the user to press the AF button.
3Ease of operation
If the image sensor is moved to assist focusing, then focusing assistance is provided, but overfocus occurs due to excessive focus adjustment speed
Solution Approach 1:
The patent applies feedback by continuously detecting the lens focus adjustment speed and using this information to adjust the image sensor movement speed. The control unit monitors the combined speed of lens and sensor movement, providing feedback control that prevents overfocus by ensuring the total focus adjustment speed remains within an appropriate range.
Data Source
AI summary
Provided are an imaging device capable of assisting focusing without giving uncomfortable feeling, a focusing assistance method thereof, and a focusing assistance program thereof. In a case where manual focusing is assisted by moving an image sensor, a focus adjustment speed by an imaging lens is detected. In a case where the focus adjustment speed by the imaging lens is reduced to a threshold value or less, the assistance is started by moving the image sensor. At this time, a focusing assistance unit is brought into an in-focus state by controlling the movement of the image sensor such that the sum of the focus adjustment speed by the imaging lens and a focus adjustment speed by the movement of the image sensor is set to a speed equal to or less than the threshold value.