PowerHap™ piezo actuators with haptic feedback · PDF filewith haptic feedback . New...

Attracting Tomorrow

Harald Kastl Head of Piezo Technology

Piezo and Protection Devices Business Group November 9, 2016

Technologies & Products Press Conference 2016

PowerHap™ piezo actuators

with haptic feedback New dimensions in performance

Technologies & Products Press Conference 2016 • PowerHap™ piezo actuators with haptic feedback

© EPCOS AG A TDK Group Company

CC • 11/16 • 2

Attracting Tomorrow

Drivers for ubiquitous touchscreens and touch surfaces • Miniaturization of devices and applications • Need for multifunctional interfaces • Protection against wet, dirty or aggressive environments • Easy cleaning, disinfection • Low maintenance • Easy to reconfigure • Reduced design and hardware costs

Touchscreens need the haptic dimension

But ... • Operating elements not perceptible to touch • Haptic feedback missing • Users must look at devices to operate them • More input mistakes and reduced safety

Strong trend toward implementing haptics, especially in automotive applications, smartphones, home appliances,

game consoles and machine control elements

Human-machine interface

(HMI)



CC • 11/16 • 3

Attracting Tomorrow

New requirements for haptic feedback technologies

The challenge is to enhance the sensory experience of HMIs and engage the full range of tactile sensitivity

• Low insertion height • Fast response time • High acceleration • High force

• Large displacement • Flexible wave form design • Integrated sensing

functionality



CC • 11/16 • 4

Attracting Tomorrow

Today’s technologies for haptic HMIs

Eccentric rotary mass (ERM)

Linear resonant actuators (LRA)

Piezo disks and benders

Off-center rotating mass spins, creating an omni-directional vibration

Magnet attached to a spring, surrounded by a coil and housed in a casing, moves in a linear fashion and brought up to the resonant frequency

Piezoelectric ceramic material that expands or contracts when voltage is applied

Modulation limited to pulsing and speed

Modulation limited to amplitude of input at resonant frequency

Frequency and amplitude can be modulated freely

Vibration of entire device (global)

Vibration of entire device (global)

Vibration of entire device (global) and more localized haptics



CC • 11/16 • 5

Attracting Tomorrow

Combines • Highest acceleration • Highest force • Customizable profiles for the entire

range of human tactile detection

with • Integrated sensor functionality • Lowest insertion height • Fastest response time • Very large displacement

Advanced new PowerHap™ piezo actuator with haptic feedback /1

Only possible using d31 (transversal) piezo actuator with a displacement amplifier

Based on advanced soft PZT ceramic

20 N type

5 N type

26 mm x 26 mm x 2.4 mm

12.7 mm x 12.7 mm x 1.6 mm



CC • 11/16 • 6

Attracting Tomorrow

Advanced new PowerHap™ piezo actuator with haptic feedback /2

Contact surfaces for leads

Multilayer plate with Cu internal electrodes

Ti cymbals bonded to both sides with epoxy-adhesive

Internal layout: 23 active layers á 39 µm

1 mm

Piezo actuator 5 N type 20 N type

Footprint [mm] 12.7 x 12.7 26.0 x 26.0

Insertion height [mm] 1.6 2.4

Operating voltage [V] ≤120

Operating temperature [°C] -40 °C to +125 °C

Displacement amplifier (cymbal)

Sheet thickness [mm] 0.1 0.2

Diameter [mm] 12.4 25.6

Recess [mm] 0.2 0.5

+ -

Multilayer structure enables operation at low voltages



CC • 11/16 • 7

Attracting Tomorrow

Operating mode of the PowerHap™

x

y

z

The cymbal acts as a lever to convert the contraction of the x- and y-axes into amplified displacement in the z-axis

When voltage is applied to the piezo plate • Small displacement (expansion) in the z-axis of the piezo plate of only ≈1.5 µm • But negative displacement (contraction) in x- and y-axes of the piezo plates of ≈13 µm

and 6.5 µm, respectively, due to the volume constant piezo effect.



CC • 11/16 • 8

Attracting Tomorrow

Large displacement

Large displacement range enables stimulation of all human mechanoreceptors

250

200

150

100

50

Elon

gatio

n [µ

m]

Umax

V 60 V 80 V

100 V 120 V

30 60 90 30 60 90 120 120

Actuator is fixed on one side with vacuum; triangular pulses up to Umax; t = 10 s

• Elongation up to 200 µm • Displacement up to 0.9 µm/V

and 1.8 µm/V, respectively, for the 5 N and 20 N types

• Broad voltage range

5 N type 20 N type

Voltage [V]

0 0



CC • 11/16 • 9

Attracting Tomorrow

Strong force

• High max. force • Large range of forces • High stiffness

up to 0.1 N/µm • High linearity

Actuator is fixed on one side with vacuum; triangular pulses up to Umax

0 0 50 100 150 200 0 50 100 150 200

Elongation [µm]

5 N type 20 N type

Maximum force with smallest component insertion height

25

20

15

10

5

Forc

e [N

]

40 V 60 V 80 V

100 V 120 V



CC • 11/16 • 10

Attracting Tomorrow

Short response time and high acceleration

Calculated acceleration (2nd order differential)

t [s]

High acceleration is necessary to provide a strong “click” feedback comparable to mechanical solutions

0.00

Dis

plac

emen

t [µm

]

800

-10

200

100

0

0.05 0.10 0.15 0.20 t [s]

0.00

Acce

lera

tion

[g]

-10

10

0

0.05 0.10 0.15 0.20

trigger time 5 N type

20 N type C10-00 LRA

LRA 5 N type 20 N type

Acceleration [g] (100 g mass)

1.7 5.0 15.0

Rise time [ms] 25 2 1



CC • 11/16 • 11

Attracting Tomorrow

PowerHap™ combines actuator and sensor in a single component

Ideal sensor for haptic applications

• PowerHap™ can detect a broad range of pressures up to 25 N

• Linear output in either V or C • Tripping force can be set individually • No additional touch sensor necessary

Input: Force

Output: voltage or charge

0 Force [N]

Volta

ge [V

]

8

6

4

2

0 5 10 15 20 25 0

Force [N]

Cha

rge

[µC

]

8

6

4

2

0 5 10 15 20 25

5 N type 20 N type

5 N type 20 N type



CC • 11/16 • 12

Attracting Tomorrow

PowerHap™ is superior to all conventional haptic technologies

Eccentric rotary mass

(ERM)

Linear resonant actuators

(LRA)

Piezo disks and benders

PowerHap™ piezo actuator

with haptic feedback

Size, insertion height [mm] 3 to 34 3 to 4 3.2 ≤2.5

Rise time [ms] 32 to 101 25 to 40 10 ≤2

Acceleration [g] (100 g mass) 0.6 to 125 0.9 to 1.7 0.65 5 / 15

Force [N] Global Global Global Localized up to 5 / 20

Customizable wave profiles No No Yes Yes

High-definition haptics No No No Yes

Sensing performance No No No Yes



CC • 11/16 • 13

Attracting Tomorrow

High-definition haptics over the entire range of human tactile detection

No significant frequency or amplitude limitations for customized haptic feedback to key human mechanoreceptors

Stimulation range for PowerHap™ piezo actuators with haptic feedback

Stimulation range for linear resonant actuators

0 10 50 100 300 1000 Frequency [Hz]

Skin

inde

ntat

ion

[µm

] 1000

100

10

Meissner’s corpuscle (vibration)

Pacinian corpuscle (rapid vibration)

Human detection threshold



CC • 11/16 • 14

Attracting Tomorrow

Multifunctional automotive HMIs

Industrial equipment Smartphones and tablets

Household appliances

ATMs and vending machines Game controllers

PowerHap™ adds the haptic dimension to a comprehensive range of HMIs

BROAD APPLICATION SPECTRUM Push button

switches Medical apparatus



CC • 11/16 • 15

Attracting Tomorrow

High interest of potential customers • First samples are available and already

under evaluation • First commercial projects expected in 2017 • Start of production end of 2017

Promising roadmap

Rapid ramp-up to volume production planned • Customer- and application-specific product development • Advanced piezo-ceramic materials and processes know-how • Engineering and manufacturing experience based on high-volume

automotive-grade piezo products

www.global.tdk.com • www.epcos.com

PowerHap™ piezo actuators with haptic feedback · PDF filewith haptic feedback . New...

Documents

Transcript of PowerHap™ piezo actuators with haptic feedback · PDF filewith haptic feedback . New...