P-720, P-721 PIFOC® Microscope Objective NanoPositioners & Scanners

  • Remotely Positions Objectives with Sub-nm Resolution
  • Travel to 100 mm
  • Straightness of Travel ≤ 30 µrad
  • Fast Settling Time


P-720/P-721 PIFOC® Microscope Objective NanoPositioners are fast and compact drive units which can be mounted on most microscopes. The units are screwed between the turret and the objective, providing a positioning and scanning range of up to 100 µm with sub-nanometer resolution while extending the optical path by only 13 mm (infinity corrected microscope required; extension tubes are available to adjust path lengths of other objectives on the turret). Standard thread is W 0.8x1/36", alternate threads are ordered separately.

In open loop, the vertical position of the objective roughly corresponds to the drive voltage (see "Tutorial: Piezoelectrics in Positioning" section for behavior of open loop piezos). The open loop models P-720 / P-721.00 are ideal for tracking applications where the position is controlled by data provided by an external sensor (e.g. optical displacement sensor, a CCD camera, etc.). The closed loop versions allow for absolute position control, high linearity and repeatability based on an integrated position feedback sensor.

Application examples:
Scanning interferometry, surface structure analysis, disk drive testing, autofocus systems, confocal microscopy, bio- technology, semiconductor test equipment.

Working principle:
PIFOC positioners are equipped with low voltage piezoelectric drives (0 to 100 V) integrated into a sophisticated flexure guiding system. The force exerted by the piezo drive pushes a flexure parallelogram via an integrated motion amplifier. The wire EDM (Electric Discharge Machining) cut flexures are FEA (Finite Element Analysis) modeled for zero stiction/ friction, ultra-high resolution and exceptional guiding precision.

Optional threads for P-721.07 and P-721.17:
P-721.02 Thread M26 x 0.75 for P-721.07/17
P-721.03 Thread M27 x 0.75 for P-721.07/17
P-721.04 Thread M28 x 0.75 for P-721.07/17
P-721.05 Thread M32 x 0.75 for P-721.07/17
P-721.06 Thread M26 x 1/36 for P-721.07/17
P-721.08 Thread M19 x 0.75 for P-721.07/17
P-721.11 Thread M25 x 0.75 for P-721.07/17

Objective Extension Tubes:
P-721.90 Objective extension tube, 13 mm, thread W0.8x1/36
P-721.91 Objective extension tube, 13 mm, thread M25 x 0.75
P-721.92 Objective extension tube, 13 mm, thread M26 x 0.75
P-721.93 Objective extension tube, 13 mm, thread M27 x 0.75
P-721.94 Objective extension tube, 13 mm, thread M28 x 0.75
P-721.95 Objective extension tube, 13 mm, thread M32 x 0.75
P-721.96 Objective extension tube, 13 mm, thread M26 x 1/36
P-721.98 Objective extension tube, 13 mm, thread M19 x 0.75


Ordering Information:
P-720.00 PIFOC Objective Positioner & Scanner, 100 µm, W0.8 x1/36"
P-721.00 PIFOC Objective Positioner & Scanner, 100 µm, W0.8 x1/36"
P-721.07 PIFOC Objective Positioner & Scanner, 100 µm, Specify Thread (P-721.01 - .08)
P-721.10 PIFOC Objective Positioner & Scanner, 100 µm, LVDT Sensor, W0.8 x1/36",
P-721.17 PIFOC Objective Positioner & Scanner, 100 µm, LVDT Sensor, Specify Thread (P-721.01 - .08)
P-721.20 PIFOC Objective Positioner & Scanner, 100 µm, Capacitive Sensor, W0.8 x1/36"

TECHNICAL DATA:
Models P-720.00P-721.00P-721.10P-721.20UnitsNotes
Max. objective diameter25393939mm 
Open loop travel @ 0 to 100 V 100909090µm ± 20 %A2
Closed loop travel* --100100µmA5
Integrated feedback sensor--LVDTCapacitive B
Closed / open loop ** resolution £ - / 1- / 110 / 11 / 1nmC1
Closed loop linearity (typ.)--0.10.03% 
Full range repeatability (typ.)--±20±5nmC3
Stiffness 0.20.30.30.3N/µm ± 20 %D1
Push/pull force capacity (in operating direction)100 / 20100 / 20100 / 20100 / 20ND3
Tilt (Q X, Q Y) (typ.)30303030µrad E1
Lateral runout (Y) (typ.)100100100100nmE2
Electrical capacitance 3.63.63.63.6µF ± 20 %F1
* Dynamic operating current coefficient (DOCC)4.5555µA/(Hz x µm)F2
Unloaded resonant frequency 400620620620Hz ± 20 %G2
Resonant frequency @ 120 g load180280280280Hz ± 20 %G3
Resonant frequency @ 200 g load150220220220Hz ± 20 %G3
Operating temperature range- 20 to 80- 20 to 80- 20 to 80- 20 to 80° CH2
Voltage connection VL VL VLVL J1
Sensor connection --L 2 x C  J2
Weight (with cables)100215235240g ± 5 % 
Body materialAlAlAlAl L
Recommended driver/controllerG, C, (A)G, C, (A)H, EH, F, L M



* Dynamic Operating Current Coefficient in µA per Hertz and µm. Example: Sinusoidal scan of 30 µm at 10 Hz requires approximately 1.4 mA drive current.
** Noise equivalent motion with E-503 amplifier.

This is a legacy product that may have limited availability or may have been replaced. Ask a PI engineer for an equivalent new model.

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