Vibration Motor Limiter Segmentation for Compact Roll Guidance
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Solution Overview
Problem
Existing vibration type motors face challenges in compactness and reliability due to the wide range of the limiter, which interferes with other components, making it difficult to reduce the size while preventing roll members from falling off.
Innovation Solution
The vibration type motor design includes a limiter with specific limiting areas that minimize the occupied space, allowing for a compact configuration by dividing the limiter into areas that follow the shape of the roll region, thereby reducing the width and enabling the press member to be positioned internally, preventing roll members from falling off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide-range limiter is provided on the side surface of the vibrator to prevent roll members from falling off, then reliability is improved, but the device width increases and component placement freedom is reduced
Solution Approach 1:
The limiter is divided into multiple limiting areas (first, second, and third limiting areas) with different lengths in the first direction. This segmentation allows each area to serve specific functions: the first limiting area prevents roll member fall-off, while the second and third limiting areas provide additional constraints without requiring a uniformly wide limiter across the entire vibrator surface.
Solution Approach 2:
Different portions of the limiter have different lengths in the first direction, creating local variations in the limiting structure. The first limiting area has a length equal to or longer than the other areas, while the second and third limiting areas have shorter lengths. This local quality differentiation allows the limiter to provide adequate protection where needed while minimizing overall device width.
2Length of stationary object
If a press member is disposed on the side surface to reduce motor thickness, then compactness in the thickness direction is improved, but the limiter width must be reduced to avoid interference
Solution Approach 1:
By segmenting the limiter into multiple areas with different dimensions, the design allows the press member to be positioned in the available space without interference from the limiter. The limiter's segmented structure creates zones that can accommodate the press member while still providing the necessary limiting function.
Solution Approach 2:
The press member is disposed in the second direction (width direction) rather than extending in the first direction where the limiter occupies space. This dimensional arrangement allows both the press member and limiter to coexist without interference, enabling thickness reduction while maintaining compact width.
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 results in a compact and reliable vibration type motor that effectively prevents roll members from falling off, allowing for a reduced width and enhanced freedom in component placement, improving the motor's overall compactness and reliability.
Implementation Method 1
a friction member configured to frictionally contact the vibrator
Implementation Method 2
two first roll members arranged along the first direction on the movable guide member, a single second roll member separated from the first roll members
Data Source
AI summary
A vibration type motor includes a limiter configured to limit a distance between a movable guide member and a fixed guide member. The limiter has first, second, and third limiting areas. The first limiting area is disposed between a first roll member and a second roll member in one direction. The second limiting area is disposed on the same side as the second roll member with respect to the first roll member and distant from the second roll member in the one direction. The third limiting area is disposed on an opposite side of the second roll member with respect to the first roll member in the one direction. A length of the first limiting area in another direction orthogonal to the one direction is equal to or longer than that of each of the second limiting area and the third limiting area in the one direction.