使用实例

Fast Autofocus Solution Transforms Vision Inspection

What is it all about?

Autofocus (AF) is a common feature in consumer cameras, but in professional imaging applications, it is often a non-standard feature with additional setup procedures.

In machine vision applications, end-users often mount industrial cameras at fixed positions. For the most part, fixed focal lenses can meet image acquisition requirements assuming the target is within a certain depth of field (DoF).

However, when the working distance to target objects constantly changes beyond the DoF, conventional fixed focal machine vision reaches its limit. An autofocus vision solution is required. Examples of such applications include: code scanning and packet sorting in logistics, inspection microscopes for quality control, and ophthalmologic examinations.

What was the problem?

There are different autofocus technologies available, including motor-driven lens autofocus and liquid lens autofocus. A traditional motor-driven autofocus lens requires around 5 seconds each time it must move and adjust, delaying production time to refocus on each passing item. It is completely inadequate for many high-speed or precise applications that require rapid refocusing.

For example, leading retailers require fully automated packet sorting systems to ensure rapid operational flow. Electronic component suppliers need highly efficient microscope inspection systems to examine multiple component arrays—and neither has 5 seconds to spare each time the system needs to refocus.

Manufacturers and system integrators alike need to integrate a rapid and effective autofocus vision solution that provides peace of mind.

The solution

Basler has designed an autofocus vision system that is fast, reliable, and easy to integrate. By combining a liquid lens with a fixed focus lens, the autofocus vision solution is not restricted by depth of field. This allows it to accurately image target objects at various working distances.