Precision lens control for highest image quality 

M3-F and M3-FS focus modules add high-resolution lens motion, with excellent dynamic stability, to the smallest OEM vision systems. Each module is a complete closed-loop motion solution and requires no more space than a typical fixed lens mount. Very low power is needed to move the lens and zero power is needed to hold the lens in any position, making the M3 Focus Module ideal for battery-powered devices. 

All M3 smart modules have embedded closed-loop control. They need only simple high-level motion commands from the camera processor, making system integration fast, simple and cost-effective. 

Precise lens position control (0.5 µm resolution) and best-in-class bi-directional repeatability enable you to capture the sharpest images in the shortest time. Designed for long life with high performance, M3 modules are not susceptible to temperature or power variations. 

Improved dynamic stability and precision 

The new M3-FS focus module is a drop-in replacement for the original M3-F focus module. The aluminum structure and innovative ball bearing guide mechanism deliver a 3x improvement in tilt and accuracy. The new M3-FS features superior dynamic stability, minimizing pixel shift with changing camera orientation. This makes it ideal for miniature handheld, portable and mobile systems. Maximum lens diameter is M16. 

The original M3-F focus module, with machined Delrin housing and a pin-bushing guide, remains an economical choice for lower-precision requirements or fixed camera positions. Maximum lens diameter is M12.

Simple integration 

Integration with camera processor 

Both the M3-FS and M3-F smart focus modules feature embedded closed-loop control. You provide simple, high-level motion commands from the camera processor over a standard I2C or SPI interface. 

Lens installation and alignment 

Install your lens using the threaded inside diameter of the M3 module. The M3-FS accepts a maximum M16 diameter lens, or an M12 lenses with a standard adapter. Smaller lenses may be feasible depending on the optical design. The M3-F accepts a maximum M12 lens directly. 

For typical camera integration, “active alignment” is required to align the optical centerline of the lens orthogonal to the image sensor by moving the M3 module and lens as a single assembly. 

After alignment, the base of the module is typically secured to the image sensor board using shims, adhesive and screws. The lens back focal distance is then set by rotating the lens in the threads and securing it with a small amount of adhesive in the threads.