Patent ID: 8561907

Claim:
A flicker-free illumination apparatus ( 28 ) for a code reader ( 10 ), the apparatus comprising: an illumination control ( 26 ) which is configured for a pulsed operation with an illumination intensity varying between light pulses ( 30 ) and pulse pauses ( 32 ); wherein the ratio of illumination intensity of the light pulses ( 30 ) to illumination intensity during the pulse pauses ( 32 ) is at most 10/1; wherein a pulse frequency of the pulsed operation of alternating light pulses ( 30 ) and pulse pauses ( 32 ) is in the range from 1 Hz to 100 Hz; and wherein the illumination control ( 26 ) is further configured to maintain a non-zero illumination intensity during the pulse pauses ( 32 ), such that a basic intensity ( 34 ) remains.