Optical Unit Shake Correction Retainer Protrusion Design
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Solution Overview
Problem
The existing optical units with shake correction functions experience unsmooth rotation due to adhesion of spherical objects in the rotation support structure, leading to interference in the rolling motion and subsequent shake correction inefficiencies.
Innovation Solution
The optical unit incorporates a rotation support structure with a plate roll and plate holder, featuring spherical objects that roll between annular portions, a retainer with protrusions for elastic deformation, and a gimbal structure to ensure smooth rotation by maintaining the rollability of spherical objects even when adhesion occurs, using a resin retainer for easy bending and a metal plate roll and holder for secure rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spherical objects are used in the rotation support structure to enable smooth rotation, then the rotation function is improved, but the spherical objects may adhere to the members causing interference in rolling motion
Solution Approach 1:
A resin retainer is introduced as an intermediary component between the spherical objects and the metal members. The retainer includes protrusions that contact the spherical objects, allowing relative movement between the retainer and members while preventing direct adhesion between the spherical objects and members. This mediator absorbs the harmful adhesion effect while maintaining the necessary rolling motion.
Solution Approach 2:
The patent changes the material parameter of the retainer from rigid metal to flexible resin, enabling elastic deformation. This parameter change allows the retainer to deform when spherical objects adhere to it, then return to its original shape to restore proper rolling motion, thereby maintaining reliability while preserving rotation smoothness.
2Reliability
If the retainer is made of flexible material to prevent adhesion interference, then the spherical object rollability is maintained, but the structural strength may be reduced
Solution Approach 1:
The retainer is designed with localized protrusions at specific positions where spherical objects contact it. These protrusions are strategically placed to provide the necessary elastic deformation for preventing adhesion interference, while the rest of the retainer structure maintains adequate strength through its overall configuration and material selection.
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 smooth rotation of the movable body, effectively correcting shake by maintaining the rollability of spherical objects and ensuring efficient shake correction across multiple axes, enhancing image stability in devices like cameras.
Implementation Method 1
a rotation structure to allow rotation of the plate roll relative to the plate holder, the plate roll including a plate-roll annular portion that is coaxial with the optical axis... three or more spherical objects to roll in contact with the plate-roll annular portion and the plate-holder annular portion
Implementation Method 2
a pressurization structure to generate a force that makes the plate-roll annular portion and the plate-holder annular portion close to each other
Implementation Method 3
The retainer may include an outer protrusion protruding to an outer circumference side from an outer retainer portion disposed on an outer side in a radial direction of each of the plurality of spherical-object holding holes and contacting with the outer wall, and an inner protrusion protruding to an inner circumference side from an inner retainer portion disposed on an inner side in the radial direction of each of the plurality of spherical-object holding holes and contacting with the inner wall
Data Source
AI summary
A retainer of a rotation support structure may include an outer protrusion on the outer circumference side of a spherical-object holding hole and an inner protrusion on the inner circumference side thereof. The outer protrusion may be in contact with a plate-holder circular arc wall of a plate-holder annular portion, and the inner protrusion may be in contact with a plate-roll annular wall of a plate-roll annular portion. When the plate-roll annular portion and the plate-holder annular portion shift with respect to the identical axis, the relative movement between the plate-roll annular portion and the plate-holder annular portion in the radial direction may be transmitted to a spherical object via the outer protrusion. Also, the relative movement may be transmitted to the spherical object via the inner protrusion, which makes the spherical object active.