Force Feedback Trigger With Nested Cam-Motor Haptic Mechanism
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Solution Overview
Problem
Augmented reality/virtual reality (AR/VR) systems struggle to faithfully simulate an object's tangible characteristics such as weight, rigidity, and texture when objects are acted upon, limiting the immersive experience.
Innovation Solution
A handheld device with a trigger mechanism incorporating a force sensor, transfer member, cam, and motor to convert user input force into haptic feedback, using a controller to determine and apply a response force through a cam and motor system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a force feedback trigger mechanism is added to the handheld device, then haptic feedback capability is improved, but device complexity increases
Solution Approach 1:
The force feedback mechanism is nested within the existing trigger assembly. The motor is positioned inside the trigger housing, sharing the same spatial envelope as the trigger mechanism itself. This nesting approach allows the haptic feedback system to be integrated without significantly increasing the overall device footprint or external complexity.
Solution Approach 2:
The trigger assembly serves multiple functions: it remains the primary input control for the handheld device while simultaneously housing the motor and force feedback mechanism. The trigger button structure is reused as part of the haptic feedback delivery system, allowing one component to fulfill dual roles and reducing the need for separate dedicated elements.
2Reliability
If a motor and cam mechanism are used to provide force feedback, then haptic realism is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of creating complex custom-shaped cams or specialized haptic elements, the design uses a standard cam mechanism that can be manufactured with conventional molding or machining processes. The cam profile is designed to work with off-the-shelf motor assemblies, copying proven mechanical patterns rather than inventing new ones, thereby simplifying manufacturing.
Solution Approach 2:
The cam mechanism's geometric parameters (radius, angle, profile shape) are optimized to work with standard motor sizes and trigger assembly dimensions. By adjusting these parameters within conventional ranges rather than requiring custom dimensions, the design maintains manufacturability while achieving the desired haptic feedback characteristics.
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
Enhances user satisfaction by providing realistic haptic feedback that simulates the resistance and feel of interacting with virtual objects, bridging the real and digital worlds.
Implementation Method 1
A force sensor may be oriented in the internal cavity and engaged to a distal end of the transfer member and the internal surface of the trigger
Implementation Method 2
A motor may be oriented in the internal cavity and coupled to the cam
Implementation Method 3
A cam may be oriented in the internal cavity and configured to engage the transfer member
Data Source
AI summary
As disclosed herein, a system may comprise a handheld device in electronic communication with a controller. The handheld device may comprise a housing defining an internal cavity and an orifice providing access to the internal cavity. A trigger may comprise an external and an internal surface. The trigger may be oriented to cover the orifice. A transfer member may be oriented in the internal cavity and coupled to the internal surface of the trigger. A force sensor may be oriented in the internal cavity and may engage a distal end of the transfer member and the internal surface of the trigger. A transfer roller may be oriented in the internal cavity and coupled to the distal end of the transfer member. A cam may be oriented in the internal cavity and may engage the transfer member. A motor may be oriented in the internal cavity and coupled to the cam.