Piezoelectric motor for ultra-thin auto focus (UTAF) smartphone cameras
3.8 mm, 2.8 V | UTAF™ New Scale Technologies

New Scale's custom UTAF actuators combine a motor with a linear guide mechanism to create an ultra-thin autofocus lens module. It is based on our patented UTAF piezoelectric motor, in which an ultrasonically vibrating beam is oriented perpendicular to the optical axis and contacts the lens at two points to maximize stability and driving force. A unique vibration mode optimizes resolution and speed for the autofocus function. The actuator assembly is only 3.8 mm high - thinner than the lens assembly. Therefore the lens, not the motor, determines the module size.

The UTAF motor is produced under license by New Scale's technology partner, TDK-EPC (EPCOS), using multi-layer co-fired ceramic processing. It is manufactured as a single part that operates directly from the phone battery, less than 2.8 V.

A reference ultra-thin autofocus module design using an M-6.5 mm lens measures 8.5 x 8.5 x 3.8 mm, compatible with SMIA85 packages.

Compared to voice coil actuators, the UTAF module offers:
Continuous autofocus for > 5-megapixel cameras at the same or lower cost
Lower operating power - total power usage reduced more than 90%
Less lens jitter and tilt - 6x improvement for > 5 MP cameras
Lower height - more space for adding mechanical shutter
Wider temperature range
Greater shock resistance - no weak flexures for guidance