Switchable day-and-night vision appts. - has optical compensating system with front lens elements offsetting image and with rear elements for chromatic correction

摘要

A day or night time vision appts. for use in target range finding, etc. in weapon systems can be switched over between the two modes of operation. The viewing lens system (1-20) has a variable aperture (BL) that regulates the input to the image intensifier tube (BR) with a rotatable housing (HE). The glass thickness of the elements in front of the tube is determined by a given optical equation. ADVANTAGE - Avoids colour errors between day and night time change-over. @(7pp Dw'.Ng ---- - ------- --. The outer, horizontal regions are used for the 4/3 format together with the central region of n x p motifs, while the vertical regions are used similarly for the 16/9 format. The diagonals of the surfaces of matrices used for both formats are almost equally long. USE/ADVANTAGE - For HDTV cameras, with automatic correction and convergence geometry, and improved function.