Stylus Rotation Ring Layout for Compact Bidirectional Detection
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Solution Overview
Problem
Existing rotation detection devices face challenges in reducing the size of the operation body in the radial direction, making it difficult to attach them to small-width members like stylus pens without discomfort, due to the use of torsion coil springs.
Innovation Solution
A rotation detection device with an annular operation member, a base member, and a returning mechanism using a cam member and coil spring, which allows for compact design and reliable detection of rotation in both directions, while returning to an initial position using an elastic force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a torsion coil spring is used as the returning mechanism, then the operation body can be returned to the center position, but the size of the operation body in the radial direction cannot be reduced
Solution Approach 1:
The patent extracts the returning mechanism from the operation body itself and places it in the base member. The coil spring is positioned in the base member rather than in the operation body, separating the returning function from the rotating component. This allows the operation body to be smaller in radial direction while the returning mechanism occupies space in the axial direction of the base member.
Solution Approach 2:
The patent changes the spatial arrangement by positioning the returning mechanism in the axial direction rather than radial direction. The coil spring is arranged along the axial direction of the rotation center axis, utilizing the axial dimension of the base member to accommodate the returning mechanism without increasing the radial size of the operation body.
2Adaptability or versatility
If the returning mechanism is placed in the operation body, then the returning function is achieved, but it becomes difficult to attach to members with small width
Solution Approach 1:
The returning mechanism is extracted from the operation body and relocated to the base member. This separation allows the operation body to maintain a compact size suitable for small-width members like stylus pens, while the base member accommodates the returning mechanism in its structure.
3Device complexity
If the switch is disposed on the operation member, then the rotation detection is simplified, but the structure becomes less compact
Solution Approach 1:
The switch is disposed on the base member in a direction intersecting with the rotation direction of the operation member. This spatial arrangement allows the switch to detect rotation through the pressing action of the protrusion while maintaining a compact overall structure, as the switch is positioned in the base member rather than extending the operation body.
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 a compact configuration that reliably detects rotation in both directions, provides a clicking sensation, and reduces the outer diameter, allowing for seamless attachment to small-width devices like stylus pens without discomfort.
Implementation Method 1
a returning mechanism configured to return the operation member to an initial position by an elastic force
Data Source
AI summary
A rotation detection device includes an operation member having an annular shape and configured to be rotatable about a rotation center axis; a base member disposed within the operation member; a switch configured to be pressed as the operation member rotates and disposed on the base member such that a rotation direction of the operation member coincides with a pressing direction; and a returning mechanism configured to return the operation member to an initial position by an elastic force. The returning mechanism is provided within the operation member, and is located opposite to the switch with the rotation center axis interposed between the returning mechanism and the switch.