| 摘要 |
1,213,298. Optical apparatus. ELLIOTT BROS. (LONDON) Ltd. July 25, 1968 [Aug. 9, 1967], No.36574/67. Heading G2J. A mounting arrangement for a replaceable semireflective member 16 of a head up display device comprises semi-reflector support means 18 mounted to be movable between at least two positions, location means 25 co-operating with the support means to locate said positions, and eccentric adjustment means 27 to vary the positions of the location means. There may be two opposite frameworks positioned at opposite edges of the semi-reflective member 16, together with associate pairs of bell crank levers 24 attached to lens housing 11 and mounted on a common axis. To move the semi-reflective member 16 from its uppermost to its lowermost position, an arm 24b of a bell crank lever 24 is moved clockwise so that rollers 25, carried on one arm 26a of a further bell crank 26, move out of slots 24d<SP>1</SP> and roll on an arcuate surface 24c of the bell crank lever 24, the arms 26a of bell crank lever 26 moving in a clockwise direction against the bias of spring 27<SP>1</SP>. When the semi-reflective member reaches its position as indicated at 16<SP>1</SP> the rollers 25 are engaged in slots 24d of bell crank levers 24. The whole arrangement can be reset by releasing bolts 26c, which lock the bearing arrangements of the further bell crank levers 26 to eccentric tubular member 27, and then rotating tubular member 27. The semi-reflective member 16 may be replaced by a new assembly by unscrewing the edge member 18 from location on frameworks 20. |
