Imaging Device Lens Position Detection via Integrated Coils
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing imaging devices face challenges in miniaturization due to the need for Hall elements and the limitations of detecting lens position using detection coils parallel to the lens movement, especially with modern actuator structures where the exciting coil is perpendicular to the lens movement.
Innovation Solution
An imaging device with a first coil moving the lens along the optical axis, a second coil moving it perpendicular to the optical axis, and a third coil detecting the magnetic field, all arranged on the same substrate, allowing for precise position detection and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall element is mounted on the actuator to detect lens position, then position detection capability is achieved, but device size increases making miniaturization difficult
Solution Approach 1:
The patent combines the detection coil with the existing actuator structure by arranging the detection coil on the same substrate as the exciting coil. This integration allows position detection functionality to be merged into the actuator without adding separate detection components, thereby achieving miniaturization while maintaining detection capability
Solution Approach 2:
The substrate is designed to serve multiple functions: it supports both the exciting coil for actuator operation and the detection coil for position sensing. This multi-functional design eliminates the need for separate detection components, reducing overall device size while achieving both actuation and detection functions
2Adaptability or versatility
If a detection coil is arranged parallel to the lens movement direction, then position detection is possible, but it cannot be applied to modern actuator structures where the exciting coil is perpendicular to the lens movement
Solution Approach 1:
The patent transitions from arranging the detection coil parallel to the lens movement (one-dimensional arrangement) to arranging it perpendicular to the movement direction on the same substrate as the exciting coil (two-dimensional arrangement). This dimensional change allows the detection coil to effectively detect magnetic field changes from the exciting coil while maintaining compatibility with modern actuator structures where the exciting coil is perpendicular to the lens movement direction
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
Enables high-performance lens drive and camera shake correction while achieving miniaturization by accurately detecting lens position and movement using induced electromotive forces, reducing noise and improving position detection accuracy.
Implementation Method 1
a third coil for detecting the first magnetic field
Implementation Method 2
a first coil that moves a lens that collects light from a subject, in an optical axis direction of the light in accordance with a first magnetic field
Implementation Method 3
a second coil for moving the lens in a direction perpendicular to the optical axis in accordance with a second magnetic field
Data Source
AI summary
Provided is an imaging device that includes a first coil that moves a lens that collects light from a subject, in an optical axis direction of the light in accordance with a first magnetic field and that moves together with the lens, a second coil for moving the lens in a direction perpendicular to the optical axis in accordance with a second magnetic field, and a third coil for detecting the first magnetic field. The second coil and the third coil are arranged on a same substrate.