An optical system for vehicles, in which the object image position in the case of movements of the vehicle with respect to a grid which is rigidly connected to the vehicle remains remain unchanged

摘要

1,240,552. Stabilized optical systems. BARR & STROUD Ltd. Jan.10, 1969 [March 12, 1968], No. 11932/68. Heading G2J. A periscope has a line of sight stabilized with respect to a sighting graticule 25 against pitching and rolling of a vehicle and comprises a viewing prism 10 rotatable about an elevation axis 11 transverse of the vehicle to deliver light into a Galilean telescope 12, 13 of X2 magnification which provides a collimated light beam that is reflected by a prism 14 and a mirror 15 gyrostabilized against pitch through a lens 16 on to a mirror 18 gyrostabilized against roll which reflects the light into a beam splitting prism 19 where it is combined with light from the illuminated graticale 25 and lens 26, the combination passing through two lenses Fig. 1 (not shown) to an observer eyepiece system Fig. 1 (not shown) having a dove prism which is contrarotatable about a vertical axis at a rate half that of components 10-31. The mirror 18 is mounted on a carriage 17 which is vertically moveable as a function of the rotation of prism 10 by means of a rack 20 and pinion 22 driven by a servo-motor 22 coupled to the scan means (not shown) of prism 10.