High-speed non-contact smartphone inspection

Flying Spot Scanner & CHRocodile CLS

Today's smartphones are high-precision multi-material devices where numerous components have to be measured for inspection purposes. As smartphones are mass-produced, these measurements have to be carried out at high speed. As an optical, contact-free system, the Precitec Flying Spot Scanner offers the great advantage of not touching delicate components during measurement. Curved edge displays present a particular challenge in phone metrology. Here, the Flying Spot Scanner is the ideal solution for measuring height and thickness.

Measuring camera module step height

A camera module consists of several mechanical parts that must be of a specified height with respect to the back glass. The key challenges in measuring these step heights are repeatability within a few µm, measurement of different materials in a single pass, and full flexibility in the measurement. The Flying Spot Scanner measures the step height of all different parts inline in a minimal cycle time. As a sample passes by at 250 mm/s, the Flying Spot Scanner inspects all the step heights simultaneously and does so on various materials (e.g. specular or diffuse glass, and metal and AR coated glass) and at different inspection locations for a single sample.

Lens tilt measurement in a smartphone camera objective

A smartphone camera objective consists of various lenses. A precise positioning of each lens is crucial for sharp, distortion-less imaging. After positioning, the tilt of each lens has to be measured with great accuracy. All lenses have different diameters and each lens has to be checked at four points. The Flying Spot Scanner achieves a repeatability within the required range of a few µm. Drawing one profile horizontally and one vertically across the lens immediately after positioning, the Flying Spot Scanner measures inline in a very short cycle time, after which the next lens can be positioned. The Flying Spot Scanner offers a long working distance to facilitate integration into a machine. The telecentric optics ensures there is no shadowing as the measurement beam hits the sample from the top. Moreover, the various inspection locations are easily covered. An additional advantage is that the step heights inside the lens barrels can be checked in exactly the same way.

PU coating thickness measurement

A plastic insulator insulates the metal housing of smartphones from the antenna. To seal this metal-plastics compound, a polyurethane (PU) coating is applied to the inside of the smartphone housing. The height and lateral thickness of this thin coating (10-120 µm) have to be measured in a short cycle time and at various locations. The Flying Spot Scanner precisely measures layers as thin as 10 µm at different locations and heights. The required repeatability and short cycle times are also achieved.

Measuring gap width and offset height

The width of the gap between the front/back glass and the outer frame, and the offset height between glass and frame have to be checked. The CHRocodile CLS confocal line sensor is ideally suited to this task as it ensures a repeatability of a few µm, and by running at 6 kHz it is fast enough for inline inspection. In addition, the CHRocodile CLS can handle various kinds of materials, e.g. specular glass and diffuse metal, and works well on inclined surfaces. Last but not least, its small true lateral resolution (up to 1 µm) enables precise measurement not only of the offset height but also of the lateral dimensions.

In consumer electronics, we can do more...

...because there are numerous production steps. Our laser technology also supports fully automated production systems to be operated precisely and to meet the highest quality requirements. 

Take a look at how you can benefit from Precitec's comprehensive laser welding & quality control solutions!

3D Metrology — Applications at a Glance

3D Metrology — Industries at a Glance

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