R5911443 /02 UDM 19• In the event of any unsafe condition, immediately terminates (or designate the termination) of LIPprojection light.Install one or more readily accessible controls to immediately terminate LIP projection light. The power input atthe projector side is considered as a reliable disconnect device. When required to switch off the projector,disconnect the power cord at the projector side. In case the power input at the projector side is not accessible(e. g. truss mount), the socket outlet supplying the projector shall be installed nearby the projector and beeasily accessible, or a readily accessible general disconnect device shall be incorporated in the fixed wiring.1.5 HD for fully enclosed projection systemsHDHazard Distance (HD) is the distance measured from the projection lens at which the intensity or theenergy per surface unit becomes lower than the applicable exposure limit on the cornea or on theskin. The light beam is considered (to be) unsafe for exposure if the distance from a person to thelight source is less than the HD.Restriction Zone (RZ) based on the HDThe projector is also suitable for rear projection applications; projecting a beam onto a defuse coatedprojection screen. As displayed in Image 1-4 two areas should be considered: the restricted enclosedprojection area (RA) and the observation area (TH).RA THswPDHD DIFFUSEswRZsw swPRHDREFLECTIONRESTRICTEDAREARESTRICTEDAREAImage 1-4RA Restricted Access location (enclosed projectionarea).PR Projector.TH Theater (observation area).RZ Restriction Zone.PD Projection Distance.SW Separation Width. Must be minimum 1 meter.For this type of setup 3 different HD shall be considered:• HD as discussed in “High Brightness precautions: Hazard Distance”, page 16, relevant for intrabeamexposure.• HDreflection : the distance that has to be kept restrictive related to the reflected light from the rear projectionscreen.• HDdiffuse : the relevant distance to be considered while observing the diffuse surface of the rear projectionscreen.As described in “High Brightness precautions: Hazard Distance”, page 16, it is mandatory to create arestricted zone within the beam areas closer than any HD. In the enclosed projection area the combination oftwo restricted zones are relevant: The restricted zone of the projected beam toward the screen; taking intoaccount 1 meter Separation Width (SW) from the beam onward. Combined with the restricted zone related tothe rear reflection from the screen (HDreflection); also taking into account a 1 meter lateral separation.Safety information
