Abstract: A light source (100) includes a plurality of light emitting devices (101), each of which output light that is collimated by a first focusing structure (103). The collimated light is input to second focusing structure (104), which focuses light from the light emitting devices as a single beam that is substantially homogeneous. The light source may be used in an LCD display, a projection system, a television system, or a computer monitor, to name a few applications.

Abstract: In an optical scanning device for scanning an optical record carrier (20) and comprising a radiation source (2), a beam splitter (8) arranged to pass a first portion (b3) of the source beam (b1) to the record carrier and a second portion (b5) to an intensity sensor (10), and a signal detector (24) in the path of the beam reflected by the record carrier, false radiation (b6) reflected by the signal detector can be prevented from reaching the intensity sensor by tilting the signal detector. A polarization filter (40) may be arranged in front of the intensity sensor to prevent false radiation reflected by the radiation source and by the signal detector from reaching the intensity sensor.