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Dimensional Metrology
Published in Richard Leach, Stuart T. Smith, Basics of Precision Engineering, 2017
Massimiliano Ferrucci, Han Haitjema, Richard Leach
As the stylus tip is scanned across the surface, its vertical displacement is recorded and converted into an electrical signal using an electromechanical transducer (ISO 25178-601 2010, Whitehouse 2010, Leach 2014b). The tip plays a critical role in the performance of a stylus instrument, as it is in physical contact with the surface. The stylus tip is usually made of diamond but other materials, such as aluminium oxide, are often employed depending of the material of the surface being measured. Other parameters that should be taken into account are the shape and size of the stylus tip, which directly affect the spatial frequency response of the instrument. Depending on the application, the stylus tip can have different geometries; the most frequently used has a conical shape with a rounded contacting edge and radius of curvature ranging from 2 µm to 10 µm, and a 60° or 90° slope angle (Leach 2014b).
Wear Tests
Published in Raymond G. Bayer, Mechanical Wear Fundamentals and Testing, Revised and Expanded, 2004
Scratch tests are primarily used to investigate the effect of various material parameters with respect to single-cycle deformation processes (71). Typically, these tests involve pressing a hard, sharp stylus against a flat specimen of the material to be evaluated and either moving the stylus along the surface or moving the surface underneath the stylus. The groove is measured and used to characterize the wear resistance. Larger grooves correspond to lower resistance. Styluses with angular and rounded tips are used. In addition to these sliding scratch tests, pendulum apparatuses are also used. In these, a stylus is attached to a pendulum, which is dropped with a know amount of energy. The stylus is set to engage the surface and move across it, creating a groove. The pendulum is then captured at its peak and before it can swing back across the surface.
Healthcare technologies
Published in Sara J. Czaja, Walter R. Boot, Neil Charness, Wendy A. Rogers, Designing for Older Adults, 2019
Sara J. Czaja, Walter R. Boot, Neil Charness, Wendy A. Rogers
With respect to usability, if possible, provide redundancy in both input and output channels. Provide multiple input options, for instance a stylus for capacitive touchscreen devices. A variety of output options such as visual, auditory, and haptic feedback are also helpful. Provide clear step-by-step instructions for troubleshooting connectivity issues. Do not rely solely on online manuals if people can be expected to lose internet connections. Provide toll-free telephone numbers for technical support.
The input efficiency of chord keyboards
Published in International Journal of Occupational Safety and Ergonomics, 2018
This study showed that input efficiency using the chord keyboard along with both pointing devices increased along with practice. Input speed increased significantly and input errors decreased significantly over the course of this study. The use of a stylus instead of a mouse may effectively reduce hand and wrist strain. The pairing of a chord keyboard and stylus is especially applicable in mobile computing devices, in particular, tablet computers. The model used in this study can serve as a reference for future keyboards that may be used as peripherals for tablets and smartphones.