New Objective Scanner with Piezo Stepping Drive for 3D Stacks with up to 1 mm Depth

2 mm Travel Range - 20 Milliseconds Settling Time:

New microscopy methods, such as two-photon microscopy, make it possible to record 3D stacks with up to 1 mm depth in biological samples. For this they require high-performance drives for positioning the objectives.

PI (Physik Instrumente) now developed the new N-725 PIFOC® objective scanner with piezo stepping drives especially for position-ing microscopy objectives. The N-725 provides travel ranges of up to 2 mm along the optical axis. At the same time the technology allows rapid positioning:

The new focusing system achieves settling times of around 20 milli-seconds for 3 µm steps. It has an extremely compact design and is no larger than conventional, piezo-based PIFOC® objective stages.

The focal plane can easily be changed with a single mechanical system thanks to the combination of high resolution and long travel ranges. Therefore, there is often no need for a combined Z-positioning of the objective, e.g. with stepper motor and additional piezo stages.

Piezo Stepping Drive – the Multi-Functional Piezo Linear Motor

The NEXACT® piezo stepping drive advantageously combines the best characteristics of piezomotor principles in a compact unit: High resolution, high force and high speed. The feed motion is achieved solely via the nanometer-accurate motion of clamped piezo actuators – wear-free, high resolution and with controllable speed.

In stepping mode, high positional resolution and high drive force can be achieved over the full travel range. Additionally, the high stiffness allows fast oscillations of 7 micrometer amplitude and resolutions to 30 pm (analog operation, open-loop).

At the target position, the drive is self-locking, requires no current and consequently generates no heat. The position is stable in the nanometer range so there is no jitter about the target position.

PI in Brief
Well-known for the high quality of its products, PI (Physik Instrumente) has been one of the leading players in the global market for precision positioning technology for many years. PI has been developing and manufacturing standard and OEM products with piezo or motor drives for 40 years now. With four German factories and ten subsidiaries and sales offices abroad, the PI Group is represented internationally.