Actuator Driver Lens Positioning Correction
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Solution Overview
Problem
Existing image capture apparatuses with autofocus functions, particularly those using voice coil motors, struggle to maintain lens position precision when subjected to acceleration, as they are not designed to correct for inertial forces effectively.
Innovation Solution
An image capture apparatus equipped with an acceleration detection unit and an actuator driver that superimposes correction values based on acceleration information onto base instruction values to control the actuator, reducing the effects of gravitational and inertial forces, and employing open-loop or closed-loop control to stabilize the lens position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gravitational force correction is implemented using acceleration detection, then lens positioning precision is improved in stationary states, but positioning accuracy deteriorates when the apparatus is subjected to acceleration
Solution Approach 1:
The actuator driver pre-calculates and applies correction values based on detected acceleration before position deviations occur. By detecting acceleration in advance and superimposing the corresponding correction value on the base instruction value, the system proactively compensates for inertial forces, maintaining positioning accuracy during accelerated motion
Solution Approach 2:
The system dynamically changes the actuator instruction parameter by superimposing a correction value on the base instruction value based on detected acceleration. This parameter modification allows the actuator to adjust its output in real-time, compensating for inertial forces and maintaining positioning precision under varying acceleration conditions
2Device complexity
If open-loop control is used to simplify the control structure, then device complexity is reduced, but stability against external forces deteriorates
Solution Approach 1:
The actuator driver incorporates feedback by detecting acceleration and using this information to dynamically adjust the actuator instruction value. This feedback mechanism allows the system to compensate for external forces such as inertial forces, improving lens position stability without requiring a complex closed-loop control structure
Solution Approach 2:
The acceleration detection unit acts as an intermediary that provides information about external forces to the actuator driver. This intermediary component enables the system to adjust its control output based on detected acceleration, improving stability against external forces while maintaining a relatively simple control architecture
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
This configuration enables high-precision lens positioning and improved stability against external forces, including gravitational and inertial forces, even during accelerated motion, thereby reducing position deviations and maintaining image quality.
Implementation Method 1
an acceleration detection unit structured to generate first acceleration information that indicates an acceleration applied to the image capture apparatus in the first direction
Implementation Method 2
an actuator structured to position a movable portion comprising the lens in a first direction... electrical energy is supplied by applying voltage, current, or the like, by means of an actuator driver, and the electrical energy thus supplied is converted into a force
Implementation Method 3
the actuator driver structured to superimpose a correction value that corresponds to the first acceleration information on a base instruction value... reducing the effects of gravitational and inertial forces
Data Source
AI summary
An actuator positions a movable portion including a lens in a first direction (Z-axis direction). An acceleration sensor generates first acceleration information ACC that indicates the acceleration applied to the image capture apparatus in the first direction. An actuator driver IC superimposes a correction value that corresponds to the first acceleration information on a base instruction value that corresponds to the target position to be set for the lens in the first direction. The actuator driver IC controls the actuator according to a corrected instruction value thus obtained.