Encoded and Crossmodal Thermal Stimulation through a Fingertip-Sized Haptic Display

Gallo, Simone; Rognini, Giulio; Santos-Carreras, Laura; Vouga, Tristan; Blanke, Olaf; Bleuler, Hannes

doi:10.3389/frobt.2015.00025

Cited by 17 publications

(8 citation statements)

References 49 publications

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“…If there is thermo-haptic feedback, more realistic touch can be delivered to users when manipulating hot water cups or objects in AR and VR mimicking daily life. In addition, the temperature is used as a way to improve object identification in virtual and remote operating environments, and it is also an important sense when inferring properties [23][24][25][26][27]. Therefore, one can convey a realistic sense to the user in a virtual environment by reproducing thermal sensations in a haptic device [28,29].…”

Section: Introductionmentioning

confidence: 99%

Three-Axis Pneumatic Haptic Display for the Mechanical and Thermal Stimulation of a Human Finger Pad

2021

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Haptic displays have been developed to provide operators with rich tactile information using simple structures. In this study, a three-axis tactile actuator capable of thermal display was developed to deliver tactile senses more realistically and intuitively. The proposed haptic display uses pneumatic pressure to provide shear and normal tactile pressure through an inflation of the balloons inherent in the device. The device provides a lateral displacement of ±1.5 mm for shear haptic feedback and a vertical inflation of the balloon of up to 3.7 mm for normal haptic feedback. It is designed to deliver thermal feedback to the operator through the attachment of a heater to the finger stage of the device, in addition to mechanical haptic feedback. A custom-designed control module is employed to generate appropriate haptic feedback by computing signals from sensors or control computers. This control module has a manual gain control function to compensate for the force exerted on the device by the user’s fingers. Experimental results showed that it could improve the positional accuracy and linearity of the device and minimize hysteresis phenomena. The temperature of the device could be controlled by a pulse-width modulation signal from room temperature to 90 °C. Psychophysical experiments show that cognitive accuracy is affected by gain, and temperature is not significantly affected.

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Section: Introductionmentioning

confidence: 99%

Three-Axis Pneumatic Haptic Display for the Mechanical and Thermal Stimulation of a Human Finger Pad

2021

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“…These vibration amplitudes are clearly perceptible. For this wire because the resistance was 69 V and the power supply voltage was 24 V, the power consumption was 24 2 /69 Â 0.2 ¼ 1.67 W. In a practical situation, we must consider how many pins are simultaneously driven and how frequently the tactile display needs to be updated, but we believe the overall power consumption can be kept lower than 10 W.…”

Section: C) Discussionmentioning

confidence: 99%

Wearable Tactile Display Based on Thermal Expansion of Nichrome Wire

Kajimoto

Jones

2019

IEEE Trans. Haptics

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A wearable tactile display needs to be compact and lightweight, and ideally should be able to present vibration, force, and temperature information to the hand. In many contexts spatially distributed tactile information is needed such as when identifying the shape of objects. In this paper, a multi-element tactile display is described based on the thermal expansion and contraction of nichrome wire. The device comprises elastic rods that are pulled by nichrome wires (30 mm in diameter). When an electrical current is applied to the wire, displacement of the elastic rod occurs with thermal elongation of the wire. The wire cools quickly and vibration results. The nichrome wire that is the basis of this display overcomes many of the material restrictions associated with shape memory alloys that have often been used for thermally driven tactile displays. Experiments that characterized the performance of the tactile display indicated that perceptible vibrations up to 320 Hz can be presented. Psychophysical studies revealed that both position and movement cues can be displayed effectively with the device. A miniaturized version of this display for wearable applications has been built and undergone preliminary evaluation.

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“…The adopted design solutions were implemented and evaluated in the prototype of a highly wearable fingertip device. Final experimental results show how the implementation of the proposed method is capable of an effective haptic It proposes development of different devices capable of specific cutaneous feedback and cues, such as contact-no contact condition, modulation of grasping forces [19], contact orientation [3], area of contact [5], stretch and indentation [12], thermal [8], multimodal feedback [6,21]. A comprehensive review of wearable haptic devices including a taxonomy can be found in [17].…”

Section: Introductionmentioning

confidence: 99%

A parallel-elastic actuation approach for wide bandwidth fingertip haptic devices

et al. 2022

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Wearable haptic devices are used to render sense of touch in different virtual reality, simulated or teleoperated environments. Design of these devices has to comply with dimensional constraints imposed by ergonomics and usability, introducing compromises between size of the actuators and features of the rendered haptic stimuli, such as peak forces and bandwidth. We propose a new design approach for wearable haptic devices resembling the micro-macro actuation concept: it is based on two distinct actuators with different mechanical reduction, coupled by an elastic element. We show this better matches the output range of the actuators to features of the signals used in typical haptic rendering. We investigated the approach through an analytical model, a numerical model, and physical experiments conducted after design and development of a working prototype. The theoretical and simulated models allow to better understand dynamic interaction of the system parts, and to define design guidelines for the development of the real device. The adopted design solutions were implemented and evaluated in the prototype of a highly wearable fingertip device. Final experimental results show how the implementation of the proposed method is capable of an effective haptic rendering, that better matches the desired frequency response.

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Encoded and Crossmodal Thermal Stimulation through a Fingertip-Sized Haptic Display

Cited by 17 publications

References 49 publications

Three-Axis Pneumatic Haptic Display for the Mechanical and Thermal Stimulation of a Human Finger Pad

Three-Axis Pneumatic Haptic Display for the Mechanical and Thermal Stimulation of a Human Finger Pad

Wearable Tactile Display Based on Thermal Expansion of Nichrome Wire

A parallel-elastic actuation approach for wide bandwidth fingertip haptic devices

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