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Haptic technology

Rumble packs for controllers, such as this Dreamcast Jump Pack, provide haptic feedback through a user's hands

Haptic technology, or haptics, is a tactile feedback technology which recreates the sense of touch by applying forces, vibrations, or motions to the user.[1] This mechanical stimulation can be used to assist in the creation of virtual objects in a computer simulation, to control such virtual objects, and to enhance the remote control of machines and devices (telerobotics). It has been described as "doing for the sense of touch what computer graphics does for vision".[2] Haptic devices may incorporate tactile sensors that measure forces exerted by the user on the interface.

Haptic technology has made it possible to investigate how the human sense of touch works by allowing the creation of carefully controlled haptic virtual objects. These objects are used to systematically probe human haptic capabilities, which would otherwise be difficult to achieve. These research tools contribute to the understanding of how touch and its underlying brain functions work.

The word haptic, from the Greek: ἁπτικός (haptikos), means "pertaining to the sense of touch" and comes from the Greek verb ἅπτεσθαι haptesthai, meaning "to contact" or "to touch."

Contents

  • History 1
  • Design, by generation 2
    • First 2.1
    • Second 2.2
    • Third 2.3
    • Fourth 2.4
  • Commercial applications 3
    • Tactile electronic displays 3.1
    • Teleoperators and simulators 3.2
    • Video games 3.3
    • Personal computers 3.4
    • Mobile devices 3.5
    • Virtual reality 3.6
  • Research 4
    • Medicine 4.1
    • Robotics 4.2
    • Arts and design 4.3
  • Future applications 5
    • Holographic interaction 5.1
    • Future medical applications 5.2
  • See also 6
  • References 7
  • Further reading 8
  • External links 9

History

One of the earliest applications of haptic technology was in large aircraft that use servomechanism systems to operate control surfaces. Such systems tend to be "one-way", meaning external forces applied aerodynamically to the control surfaces are not perceived at the controls. Here, the missing normal forces are simulated with springs and weights. In lighter aircraft without servo systems, as the aircraft approached a stall the aerodynamic buffeting (vibrations) was felt in the pilot's controls. This was a useful warning of a dangerous flight condition. This control shake is not felt when servo control systems are used. To replace this missing sensory cue, the angle of attack is measured and when it approaches the critical stall point, a stick shaker is engaged which simulates the response of a simpler control system. Alternatively, the servo force may be measured and the signal directed to a servo system on the control, known as force feedback. Force feedback has been implemented experimentally in some excavators and is useful when excavating mixed material such as large rocks embedded in silt or clay. It allows the operator to "feel" and work around unseen obstacles, enabling significant increases in productivity.

The first US patent for a tactile telephone was granted to Thomas D. Shannon in 1973.[3] An early tactile man-machine communication system was constructed by A. Michael Noll at Bell Telephone Laboratories, Inc. in the early 1970s[4] and a patent issued for his invention in 1975.[5]

1994 marked the first use of haptic technology for entertainment when Aura Systems launched the Interactor Vest, a wearable force-feedback device that monitors an audio signal and uses Aura's patented electromagnetic actuator technology to convert bass sound waves into vibrations that can represent such actions as a punch or kick. The Interactor vest plugs into the audio output of a stereo, TV, or VCR and the user is provided with controls that allow for adjusting of the intensity of vibration and filtering out of high frequency sounds. The Interactor Vest is worn over the upper torso and the audio signal is reproduced through a speaker embedded in the vest. After selling 400,000 of its Interactor Vest, Aura began shipping the Interactor Cushion, a device which operates like the Vest but instead of being worn, it's placed against a seat back and the user must lean against it. Both the Vest and the Cushion were launched with a price tag of $99.

Design, by generation

Haptics are enabled by actuators that apply forces to the skin for touch feedback, and controllers. The actuator provides mechanical motion in response to an electrical stimulus.

First

Most early designs of haptic feedback use electromagnetic technologies such as vibratory motors, like a vibrating alert in a cell phone or a voice coil in a speaker, where a central mass is moved by an applied magnetic field. These electromagnetic motors typically operate at resonance and provide strong feedback, but produce a limited range of sensations and typically vibrate the whole device, rather than an individual section.

Second

Second generation haptics offered touch-coordinate specific responses, allowing the haptic effects to be localised to the position on a screen or touch panel, rather than the whole device. Second generation haptic actuator technologies include electroactive polymers, piezoelectric, electrostatic and subsonic audio wave surface actuation. These actuators allow to not only alert the user like first generation haptics but to enhance the user interface with a larger variety of haptic effects in terms of frequency range, response time and intensity. A typical first generation actuator has a response time of 35-60ms, a second generation actuator has a response time of 5-15ms. User studies also showed that haptic effects with frequencies below 150 Hz are preferred by users. Frequencies of 250–300 Hz, which is the typical range of electromagnetic systems are well suited for alerts but are perceived as annoying over time, which is why first generation haptic systems used to enhance the user interface are often deactivated by the users.

Third

Third generation haptics deliver both touch-coordinate specific responses and customisable haptic effects. The customisable effects are created using low latency control chips.

To date two technologies have been developed to enable this; audio haptics[6] and electrostatic haptics.[7]

A new technique that does not require actuators is called reverse-electrovibration. A weak current is sent from a device on the user through the object they are touching to the ground. The oscillating electric field around the skin on their finger tips creates a variable sensation of friction depending on the waveform, frequency, and amplitude of the signal.[8]

Fourth

Fourth generation haptics deliver pressure sensitivity, enabling how hard you press on a flat surface to affect the response.

There are currently no commercially available (as of May 2013) platforms that use this functionality, but the technology is in development by a number of firms. KDDI and Kyocera jointly announced[9] in 2011 that they were collaborating on research. And, at the Future World Symposium electronics industry conference, 2012, HiWave's (haptics division now spun out to become Redux) CEO stated that the company was also working on pressure-sensitive technology.

In June 2013 a fourth generation haptics demonstration platform, called Bulldog, was announced in the UK electronics publication Electronics Weekly.[10] This took the force exerted by a finger into consideration when delivering the haptic feedback and gave three levels of feedback from a flat panel.

Commercial applications

Tactile electronic displays

A tactile electronic display is a kind of display device that presents information in tactile form. The two most popular kinds of tactile electronic displays are various refreshable braille displays and the Optacon.

Teleoperators and simulators

Teleoperators are remote controlled robotic tools—when contact forces are reproduced to the operator, it is called haptic teleoperation. The first electrically actuated teleoperators were built in the 1950s at the Argonne National Laboratory by Raymond Goertz to remotely handle radioactive substances. Since then, the use of force feedback has become more widespread in other kinds of teleoperators such as remote controlled underwater exploration devices.

When such devices are simulated using a computer (as they are in operator training devices) it is useful to provide the force feedback that would be felt in actual operations. Since the objects being manipulated do not exist in a physical sense, the forces are generated using haptic (force generating) operator controls. Data representing touch sensations may be saved or played back using such haptic technologies. Haptic simulators are used in medical simulators and flight simulators for pilot training.

Video games

Haptic feedback is commonly used in arcade games, especially racing video games. In 1976, Sega's motorbike game Moto-Cross,[11] also known as Fonz,[12] was the first game to use haptic feedback which caused the handlebars to vibrate during a collision with another vehicle.[13] Tatsumi's TX-1 introduced force feedback to car driving games in 1983.[14] The game Earthshaker was the first pinball machine with haptic feedback in 1989.[15]

Simple haptic devices are common in the form of game controllers, joysticks, and steering wheels. Early implementations were provided through optional components, such as the Nintendo 64 controller's Rumble Pak in 1997. In the same year, the Microsoft SideWinder Force Feedback Pro with built in feedback was released.[16] Many newer generation console controllers and joysticks feature built in feedback devices too, including Sony's DualShock technology. Some automobile steering wheel controllers, for example, are programmed to provide a "feel" of the road. As the user makes a turn or accelerates, the steering wheel responds by resisting turns or slipping out of control.

In 2007, Novint released the Falcon, the first consumer 3D touch device with high resolution three-dimensional force feedback; this allowed the haptic simulation of objects, textures, recoil, momentum, and the physical presence of objects in games.[17][18]

In 2013, Valve announced a line of Steam Machines microconsoles, including a new Steam Controller unit that that uses weighted electromagnets capable of delivering a wide range of haptic feedback via the unit's trackpads.[19]

Personal computers

In 2008, Apple's MacBook and MacBook Pro started incorporating a "Tactile Touchpad" design[20][21] with button functionality and haptic feedback incorporated into the tracking surface.[22] Products such as the Synaptics ClickPad[23] followed thereafter.

Mobile devices

Tactile haptic feedback is becoming common in cellular devices. Handset manufacturers like Nokia, LG and Motorola are including different types of haptic technologies in their devices; in most cases, this takes the form of vibration response to touch. Alpine Electronics uses a haptic feedback technology named PulseTouch on many of their touch-screen car navigation and stereo units.[24] The Nexus One features haptic feedback, according to their specifications.[25]

In February 2013, Apple Inc. was awarded the patent for a more accurate haptic feedback system that is suitable for multitouch surfaces. Apple's U.S. Patent for a "Method and apparatus for localization of haptic feedback"[26] describes a system where at least two actuators are positioned beneath a multitouch input device to provide vibratory feedback when a user makes contact with the unit. More specifically, the patent provides for one actuator to induce a feedback vibration, while at least one other actuator creates a second vibration to suppress the first from propagating to unwanted regions of the device, thereby "localizing" the haptic experience. While the patent gives the example of a "virtual keyboard," the language specifically notes the invention can be applied to any multitouch interface.[27]

Virtual reality

Haptics are gaining widespread acceptance as a key part of [28]

Research

Research has been done to simulate different kinds of taction by means of high-speed vibrations or other stimuli. One device of this type uses a pad array of pins, where the pins vibrate to simulate a surface being touched. While this does not have a realistic feel, it does provide useful feedback, allowing discrimination between various shapes, textures, and resiliencies. Several haptics APIs have been developed for research applications, such as Chai3D, OpenHaptics, and the Open Source H3DAPI.

Medicine

Haptic interfaces for medical simulation may prove especially useful for training in minimally invasive procedures such as laparoscopy and interventional radiology,[29] as well as for performing remote surgery. A particular advantage of this type of work is that surgeons can perform more operations of a similar type with less fatigue. It is well documented that a surgeon who performs more procedures of a given kind will have statistically better outcomes for his patients. Haptic interfaces are also used in rehabilitation robotics.

In ophthalmology, haptic refers to supporting springs, two of which hold an artificial lens within the lens capsule after the surgical removal of cataracts.

A Virtual Haptic Back (VHB) was successfully integrated in the curriculum at the Ohio University College of Osteopathic Medicine.[30] Research indicates that VHB is a significant teaching aid in palpatory diagnosis (detection of medical problems via touch). The VHB simulates the contour and stiffness of human backs, which are palpated with two haptic interfaces (SensAble Technologies, PHANToM 3.0). Haptics have also been applied in the field of prosthetics and orthotics. Research has been underway to provide essential feedback from a prosthetic limb to its wearer. Several research projects through the US Department of Education and National Institutes of Health focused on this area. Recent work by Edward Colgate, Pravin Chaubey, and Allison Okamura et al. focused on investigating fundamental issues and determining effectiveness for rehabilitation.

Robotics

The Shadow Hand uses the sense of touch, pressure, and position to reproduce the strength, delicacy, and complexity of the human grip.[31] The SDRH was developed by Richard Greenhill and his team of engineers in London as part of The Shadow Project, now known as the Shadow Robot Company, an ongoing research and development program whose goal is to complete the first convincing artificial humanoid. An early prototype can be seen in NASA's collection of humanoid robots, or robonauts.[32] The Shadow Hand has haptic sensors embedded in every joint and finger pad, which relay information to a central computer for processing and analysis. Carnegie Mellon University in Pennsylvania and Bielefeld University in Germany found The Shadow Hand to be an invaluable tool in advancing the understanding of haptic awareness, and in 2006 they were involved in related research. The first PHANTOM, which allows one to interact with objects in virtual reality through touch, was developed by Thomas Massie while a student of Ken Salisbury at MIT.[33]

Arts and design

Touching is not limited to feeling, but allows interactivity in real-time with virtual objects. Thus, haptics are used in virtual arts, such as sound synthesis or graphic design and animation. The haptic device allows the artist to have direct contact with a virtual instrument that produces real-time sound or images. For instance, the simulation of a violin string produces real-time vibrations of this string under the pressure and expressiveness of the bow (haptic device) held by the artist. This can be done with physical modeling synthesis.

Designers and modellers may use high-degree-of-freedom input devices that give touch feedback relating to the "surface" they are sculpting or creating, allowing faster and more natural workflow than traditional methods.[34]

Artists working with haptic technology such as vibrotactile effectors are Christa Sommerer, Laurent Mignonneau, and Stahl Stenslie.

Future applications

Future applications of haptic technology cover a wide spectrum of human interaction with technology. Current research focuses on the mastery of tactile interaction with holograms and distant objects, which if successful may result in applications and advancements in gaming, movies, manufacturing, medical, and other industries. The medical industry stands to gain from virtual and telepresence surgeries, which provide new options for medical care. The clothing retail industry could gain from haptic technology by allowing users to "feel" the texture of clothes for sale on the internet.[35] Future advancements in haptic technology may create new industries that were previously not feasible nor realistic.

Holographic interaction

Researchers at the University of Tokyo are working on adding haptic feedback to [28] As of 2008 the technology was not ready for mass production or mainstream application in industry, but was quickly progressing, and industrial companies showed a positive response to the technology.[36] This example of possible future application is the first in which the user does not have to be outfitted with a special glove or use a special control—they can "just walk up and use [it]".[36]

Future medical applications

One currently developing medical innovation is a central workstation used by surgeons to perform operations remotely. Local nursing staff set up the machine and prepare the patient, and rather than travel to an operating room, the surgeon becomes a telepresence. This allows expert surgeons to operate from across the country, increasing availability of expert medical care. Haptic technology provides tactile and resistance feedback to surgeons as they operate the robotic device. As the surgeon makes an incision, they feel ligaments as if working directly on the patient.[37]

As of 2003, researchers at

  • Haptic technology at HowStuffWorks
  • Levitating joystick improves computer feedback
  • What is Force Feedback? (on telerobotic manipulators) - Kraft TeleRobotics
  • Video of Novint Falcon demo at CES 2007.
  • H3DAPI - Open source haptics API; developed by SenseGraphics
  • BioRobotics Laboratory, Research on Haptics and Teleoperation
  • An animation explaining how haptic force-feedback technology works
  • IEEE Technical Committee on Haptics
  • Special Interest Group on Haptics (Haptics SIG)
  • Haptics-L: the electronic mailing list for the international Haptics community

External links

  • Klein. D, D. Rensink, H. Freimuth, G. J. Monkman, S. Egersdörfer, H. Böse & M. Baumann. Modelling the Response of a Tactile Array using an Electrorheological Fluids. Journal of Physics D: Applied Physics, vol 37, no. 5, pp794–803, 2004.
  • Klein. D, H. Freimuth, G. J. Monkman, S. Egersdörfer, A. Meier, H. Böse M. Baumann, H. Ermert & O. T. Bruhns. Electrorheological Tactile Elements. Mechatronics Vol 15, No 7, pp883–897. Pergamon, September 2005.
  • Monkman. G. J. An Electrorheological Tactile Display. Presence (Journal of Teleoperators and Virtual Environments) Vol. 1, issue 2, pp. 219–228, MIT Press, July 1992.
  • , Birkhäuser Verlag, 2008Human Haptic PerceptionRobles-De-La-Torre G. Principles of Haptic Perception in Virtual Environments. In Grunwald M (Ed.), .
  • Vashisth, A.; Mudur, S. (2008). "Deforming point-based models using an electronic glove". Proceedings of the 2008 C3S2E conference: 193.  

Further reading

  1. ^ Gabriel Robles-De-La-Torre. "International Society for Haptics: Haptic technology, an animated explanation". Isfh.org. Retrieved 2010-02-26. 
  2. ^ "Robles-De-La-Torre G. Virtual Reality: Touch / Haptics. In Goldstein B (Ed.), "Sage Encyclopedia of Perception". Sage Publications, Thousand Oaks CA (2009)." (PDF). Retrieved 2010-02-26. 
  3. ^ Patent US3780225 - TACTILE COMMUNICATION ATTACHMENT - Google Patents. Google.com (1973-12-18). Retrieved on 2013-08-23.
  4. ^ “Man-Machine Tactile Communication,” SID Journal (The Official Journal of the Society for Information Display), Vol. 1, No. 2, (July/August 1972), pp. 5-11.
  5. ^ "US Patent 3919691 A". Retrieved 22 September 2013. 
  6. ^ "Haptic controller chips offer low latency". EE Times. 12/8/2011. 
  7. ^ Wilson, Drew (2008-05-20). "Finnish interface developer gets Estonian VC investment". EE Times. 
  8. ^ Bau, Olivier; Ivan Poupyrev (July 2012). "REVEL: Tactile Feedback Technology for Augmented Reality". ACM Transactions on Graphics 31 (4): 1.  
  9. ^ Hornyack, Tim (5/10/2011). "KDDI haptic touch screen pushes your buttons". Cnet. 
  10. ^ Williams, Alun (28 June 2013). "Bulldog pushes to demonstrate fourth generation haptics". Electronics Weekly. Retrieved 22 September 2013. 
  11. ^ Moto-Cross at the Killer List of Videogames
  12. ^ Fonz at the Killer List of Videogames
  13. ^ Mark J. P. Wolf (2008), The video game explosion: a history from PONG to PlayStation and beyond, p. 39, ABC-CLIO, ISBN 0-313-33868-X
  14. ^ TX-1 at the Killer List of Videogames
  15. ^ http://thepinballreview.com/2013/06/15/1989-williams-earthshaker-overview/
  16. ^ http://www.businessweek.com/1997/50/b3557050.htm
  17. ^ Wood, Tina (2007-04-05). "Introducing the Novint Falcon | Tina Wood | Channel 10". On10.net. Retrieved 2010-02-26. 
  18. ^ "Devices". HapticDevices. Retrieved 22 September 2013. 
  19. ^ Webster, Andrew (September 27, 2013). "Valve unveils the Steam Controller".  
  20. ^ "The Tactile Touchpad". sigchi.com. 
  21. ^ "A Comparison of Three Selection Techniques for Touchpads". yorku.ca. 
  22. ^ "MacBook design". Apple.com. 
  23. ^ "ClickPad". Synaptics.com. 
  24. ^ [1]
  25. ^ [2]
  26. ^ U.S. Patent No. 8,378,797
  27. ^ Campbell, Mikey (2013-02-19). "Apple awarded patent for more accurate haptic feedback system". Apple Insider. Retrieved 3 April 2013. 
  28. ^ a b c "Touchable Hologram Becomes Reality (w/ Video)". Physorg.com. 2009-08-06. Retrieved 2010-02-26. 
  29. ^ Jacobus, C., et al., Method and system for simulating medical procedures including virtual reality and control method and system, US Patent 5,769,640
  30. ^ "Honors And Awards". Ent. ohiou.edu. Archived from the original on April 2, 2008. Retrieved 2010-02-26. 
  31. ^ "Shadow Robot Company: The Hand Overview". Shadowrobot.com. Retrieved 2010-02-26. 
  32. ^ "Robonaut". Robonaut.jsc.nasa.gov. Retrieved 2010-02-26. 
  33. ^  
  34. ^ "FreeForm Systems". Sensable. Retrieved 2010-02-26. 
  35. ^ a b c "Haptic technology simulates the sense of touch — via computer". News-service. stanford.edu. 2003-04-02. Retrieved 2010-02-26. 
  36. ^ a b "Technology | Ultrasound to give feel to games". BBC News. 2008-09-02. Retrieved 2010-02-26. 
  37. ^ [3]
  38. ^ Attila A Priplata, James B Niemi, Jason D Harry, Lewis A Lipsitz, James J Collins. "Vibrating insoles and balance control in elderly people" The Lancet, Vol 362, October 4, 2003.
  39. ^ "This Suit Gives You A Real Life Spider-Sense". Forbes. 23 February 2013. Retrieved 12 March 2013. 

References

See also

In February 2013 an inventor in the United States built a "spider-sense" bodysuit, equipped with ultrasonic sensors and haptic feedback systems, which alerts the wearer of incoming threats; allowing them to respond to attackers even when blindfolded.[39]

According to a Boston University paper published in The Lancet, "Noise-based devices, such as randomly vibrating insoles, could also ameliorate age-related impairments in balance control."[38] If effective, affordable haptic insoles were available, perhaps many injuries from falls in old age or due to illness-related balance-impairment could be avoided.

[35] The idea behind the research is that "just as commercial pilots train in flight simulators before they're unleashed on real passengers, surgeons will be able to practice their first incisions without actually cutting anyone".[35]

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