Camera Actuator OIS Design Using Ball Parts and Vertical Relocation
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Solution Overview
Problem
Existing camera modules face challenges in achieving ultra-slim and ultra-miniature designs while maintaining high-resolution imaging, due to space constraints for optical image stabilizer (OIS) actuators and magnetic field interference between OIS and auto focusing (AF) or zooming magnets.
Innovation Solution
A camera actuator design that includes a housing, a mover with optical members, ball parts for precise movement, and a driving unit with magnets and coils, allowing for efficient OIS functionality without increasing the camera module's size and minimizing magnetic field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an actuator for OIS is disposed around a lens, then image stabilization function is achieved, but space for lens size increase is limited
Solution Approach 1:
The patent relocates the OIS actuator from a radial arrangement around the lens to a position above the lens along the optical axis. This dimensional change allows the lens to expand in the radial direction without being constrained by the actuator, while the actuator utilizes the vertical space above the lens assembly.
Solution Approach 2:
The camera module is divided into distinct functional zones: the lens assembly occupies the lower portion with sufficient radial space, while the OIS actuator is segregated into the upper portion above the lens. This segmentation allows each component to be optimized independently without spatial interference.
2Volume of stationary object
If magnet for OIS and magnet for AF or zooming are disposed close to each other, then compact design is achieved, but magnetic field interference occurs
Solution Approach 1:
The OIS magnet is extracted from the common radial space around the lens and relocated to a separate position above the lens assembly. This extraction removes the source of magnetic field interference from the vicinity of the AF/zooming magnets, eliminating interference while maintaining compact overall dimensions.
Solution Approach 2:
A magnetic shielding structure is introduced as an intermediary element between the OIS magnet and the AF/zooming magnets. This shield blocks or redirects magnetic field lines, preventing direct interaction and interference between the two magnetic systems while allowing them to coexist in close proximity.
3Measurement precision
If pixel density increases, then image resolution is improved, but image shake phenomenon becomes severe
Solution Approach 1:
The patent replaces mechanical stabilization methods (such as heavier lens assemblies or mechanical dampers) with an electromagnetic OIS system. The voice coil motor generates electromagnetic forces to precisely control the lens position, providing effective shake correction without adding mechanical weight that would compromise the high-resolution sensor performance.
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
The solution enables the implementation of OIS in ultra-slim and high-resolution camera modules, securing sufficient light intake and reducing power consumption, while preventing magnetic field interference and maintaining a stable structure.
Implementation Method 1
the driving unit includes a driving magnet and a driving coil; the driving coil includes a first coil, a second coil, and a third coil
Implementation Method 2
a ball part including first balls and a second ball disposed between the housing and the mover
Data Source
Figure 1~2a
Figure 2b
Figure 3a
AI summary
An embodiment of the present invention discloses a camera actuator comprising: a housing; a mover on which an optical member sits and which is disposed inside the housing; a ball part including a first ball and a second ball and disposed between the housing and the mover; and a driving unit that is disposed inside the housing to drive the mover, wherein the mover includes a first protrusion extending toward the housing and including a recess. The recess includes: a side surface on which the ball part sits and on which at least a portion of the recess is spaced apart from the ball part; and a bottom surface in contact with the side surface.