Fresnel lens for optical device has a oblong light source enclosed by fresnel lens covered light exit opening, whereby radius of curvature of fresnel lens is greater than half or half of width of rectangle, which encloses fresnel structure
DE102005044848A1
Electronic device e.g. television, operating method, involves automatically shifting device from operating state into stand-by state after expiration of preset standby time, when no operation command is released within standby time
DE102005035321A1
Electronic flash unit with a zoom reflector
DE102005034781A1
Electronic flash
DE102005034790A1
Electronic flash
DE102004037728A1
Television receiver has facility to select time and date information through power supply interruption
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Recording device for audiovisual signals with hard disc store, has mutually independent signal input paths for reading signals onto hard disc
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Method for operating a switched-mode power supply and a switched-mode power supply operating according to it
DE10112471A1
Optical system with several optical elements for a lighting arrangement with variable light intensity distribution
DE19955943C1
Optical system for variable light distribution lighting device e.g. flash lamp device or automobile headlamp, has microstructured reflective surface of rear reflector or surface of optical element
DE19822846A1
Optical system with several optical elements for a lighting arrangement with variable light intensity distribution
DE19819090A1
Remote controller with alphanumeric input e.g. for television equipment
