Integrated Lens Driving Device for Miniaturization
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Solution Overview
Problem
There is a demand for further miniaturization and weight reduction of lens driving devices in camera modules, such as those used in smartphones, to enhance device thickness and weight reduction while maintaining reliability.
Innovation Solution
The lens driving device incorporates an auto-focusing driving part with a voice coil motor and a shake-correcting driving part, utilizing a Hall element for position detection and radially magnetized magnets, supported by elastic components to achieve miniaturization and weight reduction, and includes a camera module with an image capturing part to process subject images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a VCM-driven system with separate AF and OIS driving parts is used, then autofocus and shake correction functions are achieved, but device size and weight increase
Solution Approach 1:
The patent combines the AF driving part and OIS driving part into a single integrated lens driving device. The housing contains both the AF coil part with AF magnet part and the OIS coil part with OIS magnet part, allowing both autofocus and shake correction functions to be achieved in one unified structure rather than separate components, thereby reducing overall device weight and size.
Solution Approach 2:
The housing serves multiple functions simultaneously: it acts as the housing for the lens driving device, the AF fixing part, and the OIS fixing part. This multi-functionality reduces the number of separate components needed, contributing to weight reduction while maintaining both AF and OIS capabilities.
2Reliability
If a VCM-driven system with separate AF and OIS driving parts is used, then autofocus and shake correction functions are achieved, but device thickness increases
Solution Approach 1:
The patent integrates both AF and OIS driving mechanisms within a single housing structure. The AF coil part and OIS coil part are arranged within the same housing space, along with their respective magnet parts and supporting parts, creating a compact integrated design that reduces the overall thickness of the lens driving device compared to separate AF and OIS modules.
Solution Approach 2:
The patent employs a nested arrangement where the AF driving components (AF coil part, AF magnet part) and OIS driving components (OIS coil part, OIS magnet part) are positioned within the same housing volume. The supporting parts are configured to hold both movable parts within the constrained space of the single housing, achieving space-efficient nesting that reduces device thickness.
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 allows for the miniaturization and weight reduction of lens driving devices, camera modules, and camera-mounted devices, while improving their reliability by enabling efficient autofocus and shake correction functions.
Implementation Method 1
the autofocus fixing part includes a Hall element configured to detect a position of the autofocus movable part in the optical-axis direction
Implementation Method 2
Focusing is automatically carried out by moving the AF movable part in the optical-axis direction by utilizing a driving force of the voice coil motor composed of the AF coil part and the AF magnet part
Implementation Method 3
Shake correction is performed by swaying the OIS movable part with respect to the OIS fixing part in the plane orthogonal to the optical-axis direction by utilizing the driving force of the voice coil motor composed of the OIS magnet part and the OIS coil part
Data Source
AI summary
Provided are a lens driving device, a camera module, and a camera-mounted device for which the miniaturization and weight reduction can be achieved and the reliability can also be improved. The lens driving device includes auto-focusing and shake-correcting driving parts utilizing a voice coil motor. An autofocus fixing part includes a Hall element configured to detect a position of an autofocus movable part in the optical-axis direction, and the autofocus movable part includes a position-detecting magnet arranged near the Hall element. Both of an auto-focusing magnet part and the position-detecting magnet are radially magnetized.