Collimator Films

The LC film (Light-Control film) or collimator film is mainly used to more precisely detect the outlines of test parts in transmitted light, thus ensuring both constant product quality and reducing the rejection of defective parts.

The LC film (Light-Control-Film) or collimator film is mainly used to more accurately detect the outlines of test parts in transmitted light, thus ensuring constant product quality and reducing the rejection of defective parts.

The basic structure of the LC film consists of many highly precise lamellae similar to blinds, which are distributed over the entire surface. The goal of these prisms is to directly reflect or absorb light with unwanted angles of incidence (>30°). This means that the actual light intensity arriving at the test piece is reduced, but only light from a defined emission angle arrives. The transmission in the visible range is about 68%.

The LC film is particularly suitable for background lighting of the FLDL-TP and FLFL series. The space-saving installation of the film offers a cost-effective option compared to telecentric lighting for users who do not require a 100% parallel beam path.

The light control film used by FALCON reduces the angle of incidence of light to 30° from the vertical axis. This value has proven to be the optimal compromise between light output and angle of incidence. Telecentric lighting is currently being developed for more precise measurements.

The following image shows how stray light from unwanted emission angles illuminates the angled edges of the test piece, making measurement difficult: