Importance

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Abstract

In the case of a device for the control of the shutter of a CCD camera supplied with preferably monochromatic light such as laser light from a light source, and more particularly for the control of the shutter of a CCD camera of a light ray marksmanship system, the CCD camera photographs dots of light produced by a firearm emitting a light ray directed on a reflecting screen or a television screen so that such dots may be evaluated by a computer and displayed. In order ensure that the CCD camera is essentially unaffected by interfering light sources and light from the surroundings, which has the effect of so-called 'noise', and is able to respond to the main light ray, on the basis of a start signal the light source produces one or more light pulses and then a main pulse. An optoelectronic receiver is provided, which receives reflected (stray) light signals and passes on corresponding signals to a computer, which from the light pulse or from the decoded sequence of light pulses produces a camera shutter opening signal, which opens the camera shutter for approximately the duration of the main pulse.

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First Claim