Finger Pressure Haptic Mechanism With Sliding Force Adjustment
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Solution Overview
Problem
Existing haptic devices in virtual and mixed reality lack the capability to provide appropriate tactile feedback based on user interaction, limiting the immersive experience.
Innovation Solution
A pressure sense device comprising a tubular fitting member, a slide member, a driving device, and a protruding member that adjusts the pressing force on the user's finger based on the slide member's rotational direction and sliding amount, allowing for dynamic tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed haptic mechanism is used, then the structure is simple, but the tactile feedback cannot be adjusted according to user interaction
Solution Approach 1:
The patent implements a dynamic haptic feedback mechanism where the pressing force is adjustable based on slide member displacement. The protruding member can move along the outer circumferential surface of the annular member, changing the contact pressure on the finger pad dynamically. This allows the device to adapt to different user interactions while maintaining a relatively compact structure through the use of a slide mechanism rather than multiple fixed components.
Solution Approach 2:
The patent changes the physical parameter of pressing force by varying the displacement of the slide member. As the slide member moves along the outer circumferential surface, the distance between the protruding member and the finger pad changes, thereby adjusting the tactile feedback intensity. This parameter change approach enables adaptable haptic feedback without requiring complex mechanical structures.
2Measurement precision
If a protruding member is added to adjust pressing force, then tactile feedback is enhanced, but the device complexity increases
Solution Approach 1:
The slide member serves multiple functions: it transmits the actuating force, adjusts the pressing force through its displacement, and controls the engagement of the protruding member with the finger pad. The pinion gear also serves dual purposes by both actuating the slide member and providing mechanical advantage for force control. This multi-functionality reduces the need for additional separate components while achieving precise pressing force control.
Solution Approach 2:
The slide member acts as an intermediary between the actuating mechanism and the protruding member. It translates the actuating force into controlled displacement that adjusts the pressing force, mediating between the user's input and the haptic feedback output. This intermediary mechanism enables precise force control without requiring direct connection between the actuator and the contact point.
3Adaptability or versatility
If the slide member slides along the outer circumferential surface, then the pressing force is adjustable, but the device size increases
Solution Approach 1:
The patent uses a curved outer circumferential surface of the annular member along which the slide member slides. This curvature allows the mechanism to be compact while providing sufficient displacement range for pressing force adjustment. The arc-shaped path of the slide member enables force adjustment without requiring linear extension, thus reducing the overall device volume while maintaining adaptability.
Data Source
AI summary
A pressure sense device includes an annular fitting member, a slide member disposed so as to be slidable in a first rotational direction about a central axis of the fitting member and an opposite direction from the first rotational direction along an outer circumferential surface of the fitting member, a driving device configured to cause the slide member to slide, and a protruding member configured to protrude into an inside of the fitting member as the slide member slides in the first rotational direction.