New generations of thinner and higher performance digital still cameras are highly prone to image blur due to natural hand jitter. Optical image stabilization (OIS) is considered a key function in today’s digital camera market. Hand jitter results in rotational frequencies in the range of 1 to 20Hz and ±1.5º around the two planar axis of the camera body. The key enabling technology to correct for hand jitter is the ability to detect these minute vibrations using gyroscopes.
Typical OIS corrects for hand jitter by sensing and counteracting the measured jitter by moving an optical element such as a lens, prism, or image sensor. The hand motion is sensed using a dual-axis MEMS gyroscope and a closed-loop control system comprised of actuators and position sensors which controls an optical element within the camera. Gyroscopes are the only sensors that provide the low noise, high sensitivity and bandwidth required for this application.
Key requirements for dual-axis gyros in OIS applications are small size, high sensitivity, high cross-axis isolation, low phase delay and low noise. The InvenSense IDG-1123 meets these requirements with its 4x5x1.2mm small package size, 23mV/dps sensitivity, 140 Hz low pass filter and 0.014°/sec/ √Hz noise.
The IDG-1123 Dual Axis MEMS Gyroscope is ideally suited for OIS applications, offering the industry’s smallest dual-axis gyroscope with integrated signal conditioning.
