METHOD FOR FOCUSING SPOTLIGHT WITH DISCHARGE LAMP Russian patent published in 2014 - IPC F21S8/00 

FIELD: electricity.

SUBSTANCE: according to the suggested method the spotlight beam is directed to the screen through a non-transparent mask with two holes symmetrical in regard to the spotlight optical axis, the mask the light spot at the screen is analysed, images of the discharge lamp anode and cathode are observed and the distance d₁ is measured between peaks of two anode images and distance d₂ is measured between peaks of two cathode images, then the discharge lamp is shifted along the optical axis of the spotlight until the focusing criterion is reached, at that the focusing criterion is the ratio between the distances d₁, d₂ and d₀, where d₀ is the distance between the hole centres in the mask.

EFFECT: reducing required dimensions of process room, expansion of functionality and reducing potential hazards of application.

2 dwg