Intelligent light source with synchronization with a digital camera

US7948519B2 · kind B2 · utility

Assignee

• Digital Imaging Systems GmbH · DE

Inventors

• Horst Knoedgen · Munich, DE
• Dirk Huettmann · Baltmannsweiler, DE

Key dates

• Filing date: Mar 26, 2010
• Grant date: May 24, 2011
• Expiry date: Mar 26, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N17/00
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An intelligent light source for use with the test of a digital camera module provides a plurality of shapes of light. A fast light pulse is created with turn-on and turn-off transitions less than or equal to one microsecond. Other waveform shapes comprise a ramp and a sinusoid, and all shapes can be made to occur once or repetitively. The magnitude of the light has a range from 0.01 LUX to 1000 LUX, and the ramp has a ramp time that has a range from microseconds to 100 ms. The light comprises of a plurality of colors created by serial connected strings of LED devices, where the LED devices in a string emit the same color. The light emanating from the light source is calibrated using a photo diode and the control of a tester by adjusting offset voltages of a DAC controlling a current through the LED strings.