ACM UIST 2014: GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays

GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable DisplaysRong-Hao Liang1,2, Han-Chih Kuo1, Liwei Chan1, De-Nian Yang2, Bing-Yu Chen1 1National Taiwan University and 2Academia Sinica

2014

Multi-Token Interactions



SandScape [Wang et. al. 2010] Lumino [Baudisch et. al. 2010] ReacTable [Jorda et. al. 2007]

Multi-Token Interactions on Interactive Tabletops

Sculpting and Simulation Boardgaming Live Music Performance

Multi-Token Sensing Techniques

EMR-Tag Sensing LC-Tag Sensing Active IR-Tag Sensing

SenseTable [Patten et. al. 2001] PICO [Patten et. al. 2007] MightyTrace [Hofer et. al. 2008]

Multi-Token Sensing Techniques

EMR-Tag Sensing LC-Tag Sensing Active IR-Tag Sensing

SenseTable [Patten et. al. 2001] PICO [Patten et. al. 2007] MightyTrace [Hofer et. al. 2008]xx x

Multi-Token Interactions on Portable Displays

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Paper Session: Tangible UIST’11, October 16–19, 2011, Santa Barbara, CA, USA

352

Camera(s) Capacitive Touchscreen Magnetometer

Portico [Avrahami et. al. 2011] Capstones [Chan et. al. 2012] MagGetz [Hwang et. al. 2013]

Multi-Token Interactions on Portable Displays

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Paper Session: Tangible UIST’11, October 16–19, 2011, Santa Barbara, CA, USA

352

Camera(s) Capacitive Touchscreen Magnetometer

SandScape [Avrahami et. al. 2011] Capstones [Chan et. al. 2012] MagGetz [Hwang et. al. 2013]

Occlusion-Sensitive Large size Require Calibration

GaussSense [Liang et. al. UIST 2012]

c ad b

13年1月14日星期一

magnet

GaussSense [Liang et. al. UIST 2012]

c ad b

13年1月14日星期一

magnet

GaussBits [Liang et. al. CHI 2013]

GaussSense

GaussBits [Liang et. al. CHI 2013]

GaussSense

Problem:Radial Magnetic Field of Each Discrete Tokens

Interferes with Others in Multi-Token Interactions

GaussBricks[Liang et. al. CHI 2014]

Organic Form Construction

GaussBits

GaussSense

GaussStonesShielded Magnetic Tangibles

GaussBits

GaussBricks

GaussSense

Multi-Token Interactions Using Discrete Tokens

Magnetic Shielding

Solution:

magnet

magnetic shield

UNDERSTANDING Magnetic Shielding

"Electromagnetic shielding inside mobile phone" by Petteri Aimonen

FACT: Electromagnetic (EM) Wave Shieldingis ineffective to block static magnetic fields

conductive material"Electromagnetic shielding inside mobile phone" by Petteri Aimonen


conductive material

Opposing Field provided by Eddy current

conductive material

FACT: EM-Wave Shielding (a.k.a. Faraday Cage) is ineffective to block static magnetic fields

EM-Wave

OpposingFieldprovided by Eddy current

conductive material

EM-Wave


conductive material conductive material

Static fieldEM-Wave

FACT: EM-Wave Shieldingis ineffective to block static magnetic fields

conductive material conductive material

Static fieldEM-Wave

FACT: EM-Wave Shieldingis ineffective to block static magnetic fields

High-permeability material

EM-Wave Static field

High-permeability materials block static magnetic fields by redirecting them

(e.g. galvanized steel)(e.g. galvanized steel)

High-permeability materials (e.g. galvanized steel)

block static magnetic fields by redirecting them




(e.g. galvanized steel)







galvanized steel case







galvanized steel case

analog Hall-sensor grid

Challenge: Designing Effective Magnetic Shielding that

Minimize Interference and Maximize Signal Strength

Design Challenge:!Designing Effective Magnetic Shielding that can

Minimize the Interference and Maximize the Signal Strengthgalvanized steel case

analog Hall-sensor grid

Explorative Study Finding design parameters

Measurement #1: Interference Strength Measurement #2: Signal Strength

Blob size per layer

Area-Intensity Profile

galvanized steel chip

10mm(T) x 5mm(R) neodymium magnet



Blob size per layer





Blob size per layer



Blob size per layer






Blob size per layer

iso-intensity contours (for every 10 gauss)



Blob size per layer



Blob size per layer







Blob size per layer




Blob size per layer



Blob size per layer



Blob size per layer




Blob size per layer



Blob size per layer


1000 samples



Blob size per layer




Blob size per layer


1000 samples



Blob size per layer


1000 samples


cont

our

size

intensity


Blob size per layer


1000 samples


cont

our

size

intensity

N S S

1000 samples

No Bottom Sides Sides Sides Sides Sides Sides Sides

15 15 15 9 12 15 15 15 15

2 2 2 2 2 1.2 3 2 2

0 0 0 0 0 0 0 2.5 5

shielding method

token width (mm)

shield thickness (mm)

magnet z-axis position (mm)


No Sides Bottom

Results 1/4: Shielding methods


2 3.5 5

Results 2/4: Gap Distances (mm)


Results 3/4: Shield Thickness (mm)1.2 3 2


5 2.5 0

Results 4/4: Magnet Positions

neodymium magnet

galvanized steel shield

Findings:

Basic Design: Fix magnet at the center bottom with shielding on the sides to minimize the Interference and maximize the Signal Strength

Shield Thickness: Thicker is better, but just-thick-enough is the best.

Findings:

Basic Design: Fix magnet at the center bottom with shielding on the sides to minimize the Interference and maximize the Signal Strength

1.2mm-thick 3mm-thick3mm-thick

Shield Thickness: Thicker is better, but just-thick-enough is the best.

Token size: Larger token has larger ID space

Findings:

Basic Design: Fix magnet at the center bottom with shielding on the sides to minimize the Interference and maximize the Signal Strength 0 100

(gauss)

2 3.5 5



15mm

2 3.5 5



9mm

Acceptable signal strength for both

shielding and sensing

Designing GaussStones in Different SizesDesigning GaussStones in Difference Sizes

Particles Tokens Knobs


Particles Tokens KnobsTokens without ID

(x,y)

Particles (7.8mm-radius, 6g) Shield: 2mm-thick Magnet: 2mm-radius


Particles Tokens KnobsTokens with IDTokens without ID

(x,y) (ID,x,y)

ID amount: 2

NS

Using Larger Particles as Tokens

8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S

ID amount = 4 ID amount = 6x2 = 12ID amount = 2Larger Particles Provide More IDs

(Unit: mm)


8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S


(Unit: mm)


8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S

ID amount = 4 ID amount = 6x2 = 12

Larger Particles Provide More IDs

Area-Intensity Profiles


8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S


(Unit: mm)


8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S


Larger Particles Provide More IDs

Area-Intensity Profiles


Particles Tokens KnobsMulti-core Tokens

with IDTokens with IDTokens without ID

(x,y) (ID,x,y) (ID,x,y,θ)

Knobs - Multi-Core Tokens Provide additional IDs and Orientation Information


8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S


0 1 2 3


8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S


northsouth

B0 B3

B1 B2

Registration

Payload

2.16R 2.41R

Dual-Core Tri-Core Quad-Core

2R

B0 B1B1

B0 B2

R


8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S


0 1 2 3

Knobs - Multi-Core GaussStones Provide additional IDs and Orientation Information

(x,y,θ)

Dual-Core

Tri-Core

Quad-Core

2.16R

2R

2.41R

northsouth

B0 B3

B1 B2

Registration

Payload

2.16R 2.41R


2R

B0 B1B1

B0 B2

R


8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S


0 1 2 3 (x,y,θ)

(ID)


northsouth

B0 B3

B1 B2

Registration

2.16R 2.41R


2R

B0 B1B1

B0 B2

R

[3,2,2] [3,2,1] [3,2,0] [3,1,2] [3,1,1] [3,1,0] [3,0,2] [3,0,1] [3,0,0] [2,1,1] [2,1,0] [2,0,1] [2,0,0] [1,0,0]


8.68.68.68.61.21.21.21.2

2 1.5 1.5 2

NN SS

12.512.512.512.512.5 15222222

1.5 2 2.5 3 3.5 2 x 2

SSSSSS

Token radius

Shield thickness

Magnet radius

Polarity

7.87.822

22

N S


0 1 2 3 (x,y,θ)

(ID)Payload

[3,2] [3,1] [3,0] [2,1] [2,0] [1,0]

Dual-Core

Tri-Core


6"15"

28" 45"14"

55"140"

285"

36"

225"784"

2025"

1"

10"

100"

1000"

10000"

2" 3" 4" 5"

P"="2"

P"="3"

P"="4"Ava

ilab

le I

D a

mounts

ID amounts that a core can provide4 6 8 10

ID amount of a k-core knob grows exponentially with the core number and the ID amount that a core can provide

ID amount of a k-core knob:

with the core number & the core ID amount

ID amount that a core can provide

ID a

mou

nt o

f a k

-cor

e kn

ob

ID amount of a k-core knob grows exponentiallywith the number and size of core

1.7mm-radius

3.5mm-radius

2. Multi-Part Widgets with ID

Possible Generalizations

1. Stackable Tokens

Stackable Token (Particles with 2 IDs)

Stackable Token (Particles with 2 IDs)

Multi-Part Slider

ID part

Movable part

Multi-Part Widgets (with IDs)

ID part

movable part (Conductive)

Multi-Part Widgets (with IDs)

ConclusionInterference-Free & Identifiable Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays

GaussStonesShielded

Magnetic Tangibles

Project website

Discrete TokensMulti-Token Interactions

GaussSense Magnetic Field Camera

GaussStonesShielded

Magnetic Tangibles

Multi-Token InteractionsDiscrete Tokens


GaussBricksMagnetic

Building Blocks

Constructive InteractionsOrganic Form

GaussBitsMagnetic

Tangible Bits

Near-Surface InteractionsSingle Token

Project website

Project Gauss A system of Hardware, Materials, and Interaction Techniques that Turn Portable Displays into Generic TUI Design Platforms

GaussStonesShielded

Magnetic Tangibles

Multi-Token InteractionsDiscrete Tokens


GaussBricksMagnetic

Building Blocks

Constructive InteractionsOrganic Form

GaussBitsMagnetic

Tangible Bits

Near-Surface InteractionsSingle Token

Project website

Rong-Hao Liang1,2, Han-Chih Kuo1, Liwei Chan1, De-Nian Yang2, Bing-Yu Chen1 1National Taiwan University and 2Academia Sinica Thanks for your attention!

Project Gauss A system of Hardware, Materials, and Interaction Techniques that Turn Portable Displays into Generic TUI Design Platforms

Free-license for Personal & Non-commercial Uses

Technology

ACM UIST 2014: GaussStones: Shielded Magnetic Tangibles for Multi-Token Interactions on Portable Displays