The folding mirror stereo kop

摘要

1283114 Photo-grammetry WILD HEERBRUGG A G 31 March 1970 [14 Oct 1969] 15279/70 Heading G1F [Also in Division G2] A collapsible reflecting stereoscope comprises a lens holder 1, Fig.l carrying two magnifying lenses L1, L2 and having two lengthwise surfaces each provided with grooves 13, 14, Fig. 5 a pair of outer deflecting mirrors 6, 7 having shafts 111, 112, 121, 122 mounted displaceably and pivotally in the grooves and a pair of inner mirrors 2, 3 having frames pivotable about shafts 4, 5, the lensholder 1 having a recess 10 with two inclined sides for receiving upper end extensions of the frames of mirrors 2 and 3. To render the stereoscope operational, shafts 111-122 are displaced into grooves 14, shafts 112, 121 being displaced into notches 15 and shafts 111, 122 being retained by springs 16, the force of gravity then causes mirrors 2, 3 to fall into place. The stereoscope is folded by removing shafts 112, 121 from their notches 15 and slipping them into and along grooves 13, whereupon noses 21, 31 of mirrors 2, 3 are pressed into the recess 10 so that finally all mirror and lens surfaces are protected from damage. The non-optical parts are made of plastic, and in the operative position the mirrors are all inclined at 45 degrees to the horizontal.