Guidance of cooling air in special projectors which largely prevents the ingress of water and pollution due to dust

摘要

Special projectors are frequently used under difficult conditions such as, e.g. the influence of water and dust. In order largely to prevent ingress and pollution of the projector interior, and to achieve a virtually complete freedom from maintenance and an improvement in reliability, a special guidance of cooling air has been developed which sucks in the hot air of the lamp without it being possible for the cooling air to pollute the projector interior.