• The Journal of the Convergence on Culture Technology
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• v.7 no.1
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• pp.662-667
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• 2021

Vibrotactile feedback is a major function of the latest touch displays, which greatly improves the user's operability and immersion when interacting with the interface on the screen. In this study, we propose a vibrotactile actuator suitable for mounting on the back side of a mid- to large-sized display because it can generate a strong vibration output by applying an electrostatic force-based mechanism and can be manufactured in a thin flat panel type. The proposed actuator was developed in a structure capable of amplifying the vibration force by alternating up and down with electrostatic force by the upper and lower electrodes that are spaced apart from the electrically grounded mass suspended from a radial leaf spring. As a result of the performance evaluation, the developed bar-type module with two built-in actuators showed excellent vibration output of up to 3.3 g at 170 Hz, confirming the possibility of providing haptic feedback in medium and large touch displays.

• ICROS
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• v.20 no.3
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• pp.22-26
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• 2014

본 기술 동향에서는 햅틱 기술과 관련된 최근의 동향에 대해서 살펴보기로 한다. 특히 진동 촉각을 기반으로 한 모바일 기기용 햅틱스는 관련 연구들이 활발하게 진행 중이며 이 중에 몇 가지 연구들과 활용되는 액추에이터 등에 대한 연구들을 바탕으로 앞으로의 촉각 기반 생태계를 예측해 보고, 아울러 의료 휴대폰, 컴퓨터, 재활 분야등에서 필요로 하고 또 활용 가치가 있는 햅틱 기술들에 대해서 고찰해 보기로 한다. 최근에 각광받는 웨어러블 기기등도 내부에 다양한 센서와 액추에이터를 내장하려는 움직임이 있고, 휴대폰 등에서 진동 액추에이터를 활용하여 소리를 대체하듯 촉각 기술이 터치 스크린 기반 시장을 한 단계 발전시켜 차세대 입력 장치로 발전할 수 있는 가능성을 가늠해 볼 수 있을 것이다. 지속적인 연구를 통해 관련 분야에서 필요한 촉각 기술을 개발한다면 햅틱 연구자들이 그토록 염원하는 촉각 기반 시장의 확대 성장도 그리 오랜 시일이 걸리지 않을 것으로 기대한다.

• Journal of KSNVE
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• v.22 no.6
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• pp.25-30
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• 2012

• Journal of Internet Computing and Services
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• v.24 no.6
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• pp.23-29
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• 2023

As an effort to maximize the immersiveness of user experience in virtual reality, there have been constant efforts to provide a user with tactile sensation by providing haptic feedback. Most of the haptic feedback methods, however, can create only limited or unrealistic haptic sensations since they utilize affordable actuators such as a vibrotactile actuator. When it comes to martial arts training or a game, the limitation of such haptic feedback is apparent due to the significant difference between the physical impact of hitting an object and the sensation departed from a vibrotactile actuator. Noting this, we proposed a haptic impact system that can create a haptic impact when the user hits a virtual object with the fist. The haptic interface uses a quick-return mechanism that can deliver haptic impact feedback to a user's fist. The realism of the haptic impact was evaluated by conducting a human-subject experiment. The results indicate a significant effect of haptic feedback on the realism of the virtual impact.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.186-186
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• 2004

정보화 산업의 급속한 발전을 통하여 무수히 많은 양의 정보들이 디지털화되어 왔고, 이러한 정보를 인식하기 위해서 인간은 멀티미디어나 컴퓨터를 통해 디지털화된 환경에 접속하게 되는데, 이는 시각과 청각을 통해 디지털화된 정보를 인간에게 전달하여 준다 이러한 시각과 청각을 이용한 정보 입출력 장치를 장시간 사용할 경우 정신적으로나 육체적으로 피곤함［l］과 지루함을 느끼게 되고, 장시간 사용이후에도 외부환경에 대한 반응이 일순간 둔감해질 수도 있다.(중략)

• Journal of Korea Multimedia Society
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• v.14 no.9
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• pp.1210-1220
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• 2011

In this paper, we suggest a haptic mouse system as an immersive interface between virtual environment and a human operator. The proposed haptic mouse creates vibrotacitle and thermal sensation to increase the immersion. The vibrotactile module is composed of eccentric motors and a solenoid actuator, and the thermal module consists of a thin-film resistance temperature detector and a Peltier thermoelectric heat pump. In order to evaluate the proposed haptic mouse system, we develop a simple racing game and conduct an experiment. The result of the experiment shows that the proposed haptic mouse system can improve the sense of reality in virtual environment and can be used as an effective interface between virtual environment and a human operator.

• Composites Research
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• v.37 no.4
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• pp.247-264
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• 2024

Recent advances in electro-active polymer (EAP) actuators, owing to their flexibility, lightweight, and simple fabrication process, have showcased their high utility across various fields such as soft robotics, biomimetics, wearable devices, and haptic technologies. Moreover, EAP actuators are evolving into smart devices with new functions and characteristics through the integration of functional materials and innovative technologies. This paper categorizes EAPs into ionic EAPs and electronic EAPs. Ionic EAPs include, most notably, ionic polymer-metal composites (IPMCs) and conducting polymers (CPs), while electronic EAPs encompass dielectric elastomer actuators (DEAs), ferroelectric polymer actuators, and the recently introduced hydraulically amplified self-healing electrostatic (HASEL) actuators. Detailed explanations based on the latest research are provided concerning the mechanism, structure, performance improvement strategies, methods for adding functionality, and application areas for each type of actuator.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.25 no.8
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• pp.1308-1316
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• 2001

A hybrid type master system is proposed to take the advantage of the link mechanism and magnetic levitation mechanism without using a force sensor. Two different types of electromagnetic actuators, moving coil type and moving magnet types are used to drive the master system which is capable of 4-DOF actuation. It is designed that the rotation motions about x-y axis are decoupled and the whole system is represented by simple dynamic equations. The force reflection is achieved by using the simple relation between the force and applied current and position. The simulation and experimental results are presented to show its performance.

• Journal of the Korean Society for Precision Engineering
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• v.28 no.11
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• pp.1259-1264
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• 2011

This paper suggests a new film-type haptic actuator based on cellulose acetate electro-active paper. Conventional tiny haptic actuators in mobile devices can create vibrotactile sensation at only near resonant frequency. The strategy of operating near the resonant frequency, however, brought a new issue for creating vibrotactile sensation which can be strong enough to feel in arbitrary frequency. Another problem is that the size of the conventional actuator is not small enough to be embedded into slim mobile devices. In order to achieve these issues, we propose a thin and tiny actuator based on a cellulose acetate material charged with an electric potential. The motion of the actuator can be a concave or a convex by controlling a polarity of both charged membranes and the actuator performance can be modulated by increasing level of biased electric potential.

• Information and Communications Magazine
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• v.29 no.7
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• pp.16-24
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• 2012

Apple의 iPod Touch가 등장한 이래로, 다양한 모바일 디바이스에서 터치 인터페이스가 사용자 입력 수단으로서 사용되고 있다. 또한 최근 터치 인터페이스 기술은 터치할 때 사용자에게 실감나는 촉각 피드백을 제공하기 위한 다양한 방법을 시도하고 있다. 촉각 피드백의 유용성은 터치 입력에 대한 즉각적인 피드백, 오디오나 그래픽과 융합하여 사실적이고 직관적인 피드백 제공 등으로 요약할 수 있다. 이러한 장점은 터치 인터페이스 사용에 대한 사용자 경험 (User Experience)을 차별화 할 수 있기 때문에 제품 경쟁력에도 도움이 된다. 본 고에서는 촉각 피드백을 제공하는 햅틱 시스템에 대해 일반적인 내용을 알아보고, 특히 터치 인터페이스를 갖는 모바일 디바이스에서 사용될 수 있는 촉각 제 시 방법 및 촉각 액추에이터의 최근 기술동향에 대해 살펴본다.