Systems and methods for generating damped electromagnetically actuated planar motion for audio-frequency vibrations

10659,885

16/592487

October 03, 2019

A vibration module for applying vibrational tractions to a wearer's skin is presented. Use of the vibration module in headphones is illustrated for providing tactile sensations of low frequency for music, for massage, and for electrical recording and stimulation of the wearer. Damped, planar, electromagnetically-actuated vibration modules of the moving magnet type are presented in theory and reduced to practice, and shown to provide a substantially uniform frequency response over the range 40-200 Hz with a minimum of unwanted audio.

Taction Technology, Inc. (Los Gatos, CA, US)

Taction Technology, Inc. (Los Gatos, CA, US)

1. An apparatus for imparting motion to the skin of a user, the apparatus comprising: a housing; a plurality of coils capable of carrying electrical current; a plurality of magnets arranged in operative proximity to the plurality of coils; a moving portion comprising an inertial mass and the plurality of magnets; a suspension comprising a plurality of flexures that guides the moving portion in a planar motion with respect to the housing and the plurality of conductive coils; wherein movement of the moving portion is damped by a ferrofluid in physical contact with at least the moving portion; and wherein the ferrofluid reduces at least a mechanical resonance within the frequency range of 40-200 Hz in response to electrical signals applied to the plurality of conductive coils.

2. The apparatus of claim 1 wherein said housing is generally cuboid in shape.

3. The apparatus of claim 2 wherein the cuboid-shaped housing has a thickness less than one-third of a width, where the thickness and width are both orthogonal to a direction of motion of the moving portion, and the thickness is less than the width.

4. The apparatus of claim 2 wherein the cuboid-shaped housing has a length dimension in a direction of motion of the moving portion, and a thickness dimension perpendicular to the length dimension, wherein the thickness dimension is less than one-third of the length dimension, and the thickness is less than a width.

5. The apparatus of claim 4 wherein at least one magnetic flux guide comprises a portion of said housing and is coupled to at least a coil.

6. The apparatus of claim 1 wherein said housing comprises at least one magnetic flux guide comprising a ferromagnetic material.

7. The apparatus of claim 6 wherein each said at least one magnetic flux guide is coupled to a plurality of coils.

8. The apparatus of claim 1 wherein said housing comprises a plurality of magnetic flux guides, each comprising an upper magnetic flux guide and a lower magnetic flux guide.

9. The apparatus of claim 1 wherein each of said plurality of coils is an elongated oval with substantially flat sides.

10. The apparatus of claim 9 wherein each of said flexures is thinner along a motion axis of the moving portion than it is in directions orthogonal to the motion axis of the moving portion.

11. The apparatus of claim 9 wherein each of said flexures is more resistant to motion transverse to a plane of the moving portion than it is to linear motion in the plane of and along a motion axis of the moving portion.

12. The apparatus of claim 1 wherein a long axis of each of the plurality of flexures is substantially in a plane of the moving portion.

13. The apparatus of claim 1 wherein said apparatus is capable of producing audio frequency vibrations in response to electrical signals applied to the plurality of coils.

14. The apparatus of claim 1 wherein each of said plurality of magnets is mounted so that it has a polarity that is the opposite of the polarity of the magnet or magnets adjacent to it.

15. The apparatus of claim 1 wherein said plurality of flexures are not integrally formed with said moving portion or said housing.

16. The apparatus of claim 1 wherein said moving portion moves relative to said plurality of coils along a plane that is orthogonal to a thickness dimension of the housing, wherein said thickness dimension is smaller than a length dimension and a width dimension.

17. An apparatus for imparting motion to the skin of a user, the apparatus comprising: a housing or frame; a conductive coil capable of carrying electrical current; a plurality of magnets arranged in operative proximity to the plurality of coils; a moving portion comprising an inertial mass and the plurality of magnets; a suspension comprising a plurality of flexures that guides the moving portion in a planar motion with respect to the housing and the conductive coil; wherein movement of the moving portion is damped by a ferrofluid in physical contact with at least the moving portion; and wherein the ferrofluid reduces at least a mechanical resonance within the frequency range of 40-200 Hz in response to electrical signals applied to the conductive coil.

18. The apparatus of claim 17 wherein the housing or frame has a thickness less than one-third of a width, where the thickness and width are both orthogonal to a direction of motion of the moving portion.

19. The apparatus of claim 17 wherein said conductive coil is an elongated oval with substantially flat sides.

20. An apparatus for generating damped electromagnetically actuated planar motion, the apparatus comprising at least one vibration module, said vibration module comprising: a housing; a coil capable of carrying electrical current; a plurality of magnets arranged in operative proximity to the plurality of coils; a moving portion comprising an inertial mass and the plurality of magnets; a suspension comprising a plurality of flexures that guides the moving portion in a planar motion with respect to the housing and the coil; wherein movement of the moving portion is damped by a ferrofluid in physical contact with at least the moving portion; and wherein the ferrofluid reduces the Q-Factor of the response of the apparatus over at least a portion of the frequency range of 40-200 Hz in response to signals applied to the coil.

21. The apparatus of claim 20 wherein: the apparatus comprises a headphone set, said headphone set comprising a headphone bow with ear cups at opposite ends; the at least one vibration module is coupled to at least one of the headphone bow or ear cups; and the at least one vibration module guides motion of the moving portion in a plane substantially parallel to a surface of the user's head contacted by at least one of said headphone bow and said ear cups.

3919607 November 1975 Habock et al.
4017694 April 1977 King
5296790 March 1994 Fincher
5621293 April 1997 Gennesseaux
5717767 February 1998 Inanaga et al.
5783899 July 1998 Okazaki
5921149 July 1999 Masberg et al.
6023515 February 2000 McKee et al.
6603863 August 2003 Nagayoshi
7071584 July 2006 Kawano et al.
8097988 January 2012 Kim et al.
8134259 March 2012 Choi
8253282 August 2012 Park
8398570 March 2013 Mortimer et al.
8400027 March 2013 Dong et al.
8461728 June 2013 Park et al.
8492938 July 2013 Park
8502864 August 2013 Watkins
8598750 December 2013 Park
8669679 March 2014 Lee et al.
8767996 July 2014 Lin et al.
8797295 August 2014 Bernstein et al.
8860262 October 2014 Kim et al.
8860263 October 2014 Yoon
8892233 November 2014 Lin et al.
8963695 February 2015 Johnson et al.
8977376 March 2015 Lin et al.
9106986 August 2015 Shen et al.
9107011 August 2015 Broadley et al.
9110536 August 2015 Sorvisto et al.
9201458 December 2015 Hunt et al.
9263983 February 2016 Miyazaki
9277320 March 2016 Hoskins
9277334 March 2016 Wong et al.
9306429 April 2016 Akanuma et al.
9312744 April 2016 Akanuma et al.
9430921 August 2016 Biggs
9535501 January 2017 Moussette et al.
9548646 January 2017 Park et al.
9590463 March 2017 Kuroda et al.
9594429 March 2017 Bard et al.
9652040 May 2017 Martinez et al.
9680672 June 2017 Hajati et al.
9748827 August 2017 Dong
9815085 November 2017 Chun
9830782 November 2017 Morrell et al.
9850957 December 2017 Lee et al.
9936273 April 2018 Biggs
9966825 May 2018 Hajati et al.
10069392 September 2018 Degner et al.
10108265 October 2018 Harley et al.
10126817 November 2018 Morrell et al.
10127778 November 2018 Hajati et al.
10218250 February 2019 Berrezag et al.
10236760 March 2019 Moussette et al.
10390139 August 2019 Biggs
2002/0001392 January 2002 Isono
2003/0015929 January 2003 Lee
2004/0155741 August 2004 Godin
2004/0251750 December 2004 Cheung et al.
2005/0189823 September 2005 Backs
2006/0045298 March 2006 Westerkull
2006/0171553 August 2006 Wong et al.
2006/0290662 December 2006 Houston
2006/0293722 December 2006 Slatkine et al.
2007/0146317 June 2007 Schena
2007/0270196 November 2007 Wu
2007/0290988 December 2007 Nogami et al.
2008/0001483 January 2008 Kitamura et al.
2008/0090622 April 2008 Kim et al.
2008/0096726 April 2008 Riley et al.
2008/0194962 August 2008 Randall
2009/0036212 February 2009 Provancher
2009/0174266 July 2009 Jajtic et al.
2010/0046787 February 2010 Aarts
2010/0134225 June 2010 Yajima et al.
2010/0141408 June 2010 Doy et al.
2010/0316235 December 2010 Park et al.
2011/0018365 January 2011 Kim et al.
2011/0018367 January 2011 Kim et al.
2011/0101896 May 2011 Shikayama et al.
2012/0025742 February 2012 Masahiko
2012/0027222 February 2012 Kirsch et al.
2012/0032619 February 2012 Kobayashi et al.
2012/0062047 March 2012 Nakagawa et al.
2012/0163269 June 2012 Shuster et al.
2012/0200021 August 2012 Kanaya et al.
2012/0237067 September 2012 Asnes
2012/0249797 October 2012 Haddick et al.
2012/0293022 November 2012 Park
2013/0022220 January 2013 Dong et al.
2013/0033126 February 2013 Choi
2013/0076652 March 2013 Leung
2013/0099600 April 2013 Park
2013/0113305 May 2013 Choi
2013/0204169 August 2013 Poepperling et al.
2013/0225915 August 2013 Redfield et al.
2013/0322676 December 2013 Araki et al.
2013/0339850 December 2013 Hardi et al.
2013/0342521 December 2013 Griffiths et al.
2014/0009005 January 2014 Irwin
2014/0056459 February 2014 Oishi et al.
2014/0064536 March 2014 Kim et al.
2014/0125558 May 2014 Miyajima et al.
2015/0070274 March 2015 Morozov
2015/0081110 March 2015 Houston et al.
2015/0109223 April 2015 Kessler et al.
2015/0110277 April 2015 Pidgeon et al.
2015/0177899 June 2015 Degner et al.
2015/0181338 June 2015 Hosoi et al.
2015/0195663 July 2015 Lin et al.
2015/0214822 July 2015 Kim et al.
2015/0242608 August 2015 Kim et al.
2015/0289034 October 2015 Engman et al.
2015/0319546 November 2015 Sprague
2016/0056701 February 2016 Lee et al.
2016/0105089 April 2016 Shi et al.
2016/0173318 June 2016 Ha et al.
2016/0181904 June 2016 Zhang
2016/0209648 July 2016 Haddick et al.
2016/0212515 July 2016 Biggs
2016/0216943 July 2016 Welti et al.
2016/0234588 August 2016 Timothy et al.
2017/0059871 March 2017 Hashiba et al.
2017/0110951 April 2017 Akanuma et al.
2017/0123499 May 2017 Eid
2017/0171666 June 2017 Biggs
2017/0180863 June 2017 Biggs
2017/0227778 August 2017 Osterhout
2019/0189106 June 2019 Hull et al.
2019/0261088 August 2019 Sheffield
2019/0378385 December 2019 Biggs
2013203626 May 2013
2 808 716 March 2012
100468926 March 2009
103847454 June 2014
103872875 June 2014
103918283 July 2014
0 204 386 December 1986
0 229 013 July 1987
0 239 333 September 1987
1 258 970 November 2002
1 282 338 February 2003
1 300 932 April 2003
1 438 111 July 2004
2 183 660 May 2010
2 273 346 January 2011
2 338 219 June 2011
2 626 990 August 2013
2 786 591 October 2014
2 890 153 July 2015
2 977 858 January 2016
2007-043768 February 2007
10-1506556 March 2015
10-2016-0057772 May 2016
WO 2006/001436 January 2006
WO 2012/173669 December 2012
WO 2013/134388 September 2013
WO 2014/031756 February 2014
WO 2014/147946 September 2014
WO 2014/179969 November 2014
WO 2016/007920 January 2016

Ahmadkhanlou, Farzad, “Design, Modeling and Control of Magnetorheological Fluid-Based Force Feedback Dampers for Telerobotic Systems”, Apr. 2008, pp. 18. http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.515.6737&rep=rep=1&type=pdf. cited by applicant
Olaru et al., “New Linear Actuator with Ferrofluid and Permanent Magnets”, Revue Roumaine des Sciences Techniques—Serie Électrotechnique et Énergétique, Jan. 2014, pp. 9. cited by applicant
Verrillo et al., “Sensation Magnitude of Vibrotactile Stimuli”, Perception and Psychophysics, 1969, vol. 6 (6A), pp. 366-372. cited by applicant
Official Communication received in European Patent Application No. 15843916.6, dated Apr. 20, 2018 in 9 pages. cited by applicant
Official Communication received in European Patent Application No. 15843916.6, dated Dec. 12, 2018 in 6 pages. cited by applicant
International Search Report and Written Opinion received in PCT Application No. PCT/US2015/051888, dated Feb. 2, 2016 in 11 pages. cited by applicant
Official Communication received in European Patent Application No. 16847504.4, dated Apr. 18, 2019 in 14 pages. cited by applicant
Official Communication received in European Patent Application No. 16847504.4, dated Jul. 24, 2019 in 12 pages. cited by applicant
International Search Report and Written Opinion received in PCT Application No. PCT/US2016/052347, dated Jan. 27, 2017 in 10 pages. cited by applicant
http://www.tekkeon.com/downloads/et3000, datasheet,fn.1.pdf, dated Nov. 15, 2008. cited by applicant
Melillo, et al., “Ferrofluids as a Means of Controlling Woofer Design Parameters”, Journal of the Audio Engineering Society, Audio Engineering Society, New York, NY, US, vol. 29, No. 3, Mar. 1, 1981, pp. 132-138, USSN: 1549-4950. cited by applicant

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