Figure 2: Experimental apparatus (left) and dimensions (right) for the validation of the mechanical amplification caused by the lever mechanism between the force on the temple, Ftemple, and the force on the hinge, Fhinge. | Scientific Reports

Figure 2: Experimental apparatus (left) and dimensions (right) for the validation of the mechanical amplification caused by the lever mechanism between the force on the temple, Ftemple, and the force on the hinge, Fhinge.

From: A glasses-type wearable device for monitoring the patterns of food intake and facial activity

Figure 2

The 3D-printed glasses were fixed to a stage equipped with a micrometer dial gauge and a linear sub-stage to contact the temple. In order to reflect general wear conditions, the load cell on the temple was placed at an assumed contact point with the epidermis, 69 mm away from the hinge joint in this experiment. We applied the force to the load cells by moving the linear sub-stage with a 50 μm resolution. From the moment equilibrium, the theoretical-amplified force on the hinge is calculated by eq. (1).

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