Optical Unit Shake Correction Positioning Reference Alignment
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Solution Overview
Problem
Existing optical units with shake correction functions face challenges in positioning the optical module's reference point close to the turning center, leading to variations in the movable body's gravity center and interference issues during assembly.
Innovation Solution
The optical unit incorporates a movable body with an optical module and a holder on its outer periphery, featuring a swing support mechanism that allows movement around two axes intersecting the optical axis, along with a protruded part and position restriction mechanism to align the optical module's reference point with the holder, and a fixed body with a projecting part that prevents interference during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the top surface of the imaging unit is used as the abutting face for positioning in the optical axis direction, then the positioning is simple, but the positioning reference is located at a position largely separated from the turning center, causing large variation in gravity center position
Solution Approach 1:
The patent transitions from using the top surface (one-dimensional positioning) to using the side surface with a protruded part (introducing radial dimension positioning). This allows the positioning reference to be located closer to the turning center in both axial and radial directions, reducing gravity center variation while maintaining positioning simplicity through the abutting structure.
2Stability of the object's composition
If a protruded part protruding to the outer peripheral side is formed in the optical module to set as positioning reference, then the positioning reference can be brought close to the turning center, but the protruded part interferes with components on the fixed body side during assembly
Solution Approach 1:
The holder acts as an intermediary component between the optical module and the fixed body. It provides the position restriction part that interfaces with the protruded part, and the case provides the stopper part that prevents interference with fixed body components. This mediator structure enables the protruded part to serve as positioning reference close to the turning center while avoiding assembly interference.
3Stability of the object's composition
If the positioning reference is brought close to the turning center, then the gravity center variation is reduced, but the positioning reference may interfere with fixed body components
Solution Approach 1:
The patent segments the positioning function into two separate components: the protruded part on the optical module provides the positioning reference close to the turning center, while the stopper part on the case prevents interference with fixed body components. This segmentation allows both objectives to be achieved simultaneously without mutual interference.
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 reduces the variation in the movable body's gravity center and allows for efficient assembly by positioning the optical module's reference point closer to the turning center, avoiding interference with fixed body components.
Implementation Method 1
a swing support mechanism structured to swingably support the movable body around a first axial line intersecting an optical axis and swingably support the movable body around a second axial line intersecting the optical axis and the first axial line
Implementation Method 2
The shake correction drive mechanism is a magnetic drive mechanism which includes a magnet and a coil, and one of the magnet and the coil is fixed to the movable body, and the other is fixed to the fixed body
Data Source
AI summary
An optical unit with a shake correction function include a movable body having an optical module and a holder surrounding the optical module, a swing support mechanism swingably supporting the movable body, a fixed body, and a shake correction drive mechanism. The optical module has a protruded part, and the holder has a position restriction part with which the protruded part is abutted. The fixed body includes a case accommodating the holder, and the case includes an outer frame part surrounding the holder and a projecting part projecting to an inner peripheral side from an end part on an image side of the outer frame part. The projecting part has a stopper part overlapping with the holder, and the protruded part and the position restriction part are located on an inner peripheral side with respect to the projecting part when viewed in the optical axis direction.