Optical Unit Rotation Axis Center of Gravity Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical units with rotation mechanisms face limitations in movable range due to interference and increased power consumption, as the rotating holder's small gap with the housing restricts movement and is prone to sagging due to its weight.
Innovation Solution
A U-shaped spring member is used between the fixed and movable bodies, forming a rotation axis that passes through the center of gravity of the movable body, applying a force to widen the gap and reduce sliding load, with convex and concave spherical surfaces for point contact and a bearing structure that prevents interference and misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the gap between the rotating holder and housing is made small, then the device size is reduced, but the movable range becomes limited due to interference
Solution Approach 1:
The rotation axis is repositioned from the conventional spherical body location to pass through the center of gravity of the rotating holder. This dimensional repositioning allows the rotation path to clear the housing boundaries, expanding the movable range without increasing the gap distance, thus resolving the contradiction between compact size and rotation range.
2Device complexity
If the rotation axis is positioned away from the center of gravity, then the rotation mechanism is simplified, but the rotating holder sags due to its own weight
Solution Approach 1:
The rotation axis is positioned to pass through the center of gravity of the rotating holder, creating a self-balancing configuration where the holder's weight is evenly distributed around the rotation axis. This eliminates the sagging problem caused by unbalanced weight distribution, maintaining holder stability without requiring additional counterweight mechanisms.
3Device complexity
If the rotation axis does not pass through the center of gravity, then the structure is simpler, but power consumption increases to prevent sagging
Solution Approach 1:
By positioning the rotation axis through the center of gravity, the holder achieves gravitational balance, eliminating the need for additional power consumption to counteract sagging forces. The self-balancing configuration reduces energy requirements while maintaining structural simplicity.
4Length of moving object
If the gap between movable body and fixed body is widened, then the movable range increases, but the device size increases
Solution Approach 1:
The rotation axis is repositioned to pass through the center of gravity of the movable body, changing the rotational geometry. This allows the movable body to rotate through a larger angle within the same gap distance, increasing the effective movable range without widening the physical gap, thus maintaining compact device dimensions.
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 increases the movable range of the optical unit while reducing power consumption and preventing sagging, allowing for a more compact and efficient optical unit design.
Implementation Method 1
a U-shaped spring member that is disposed between the fixed body and the movable body in the axial direction and applies a force in a direction to widen a space between the fixed body and the movable body in the axial direction
Implementation Method 2
one of the rotation-axis first forming member and the rotation-axis second forming member has a convex spherical surface and the other of the rotation-axis first forming member and the rotation-axis second forming member has a concave spherical surface on which the convex spherical surface slides
Data Source
AI summary
An optical unit including a reflection portion, a movable body, a fixed body; and a rotation support mechanism that rotates the movable body with respect to the fixed body in an axial direction as a rotation axis, in which the rotation support mechanism has a U-shaped spring member disposed between the fixed body and the movable body in the axial direction and applies a force in a direction that widens the space between the fixed body and the movable body, the spring member has a rotation-axis first forming member, the movable body has a rotation-axis second forming member, and the rotation-axis first forming member and the rotation-axis second forming member are arranged at positions where a rotation axis passes through a center of gravity position of the movable body.