GB605483A - Improvements in or relating to range finders - Google Patents

Abstract

605,483. Range-finders. KODAK, Ltd. Dec. 20, 1945, No. 34562. Convention date, Jan. 19, 1943. [Class 97 (i)] In a stereoscopic range-finder in which left and right eye images are formed in image planes each containing a stereoscopic reticle mark, each plane also contains one of a pair of range indicating elements, e.g. index and scale and reflectors are placed before each entrance window so that light from one of the elements is reflected through its adjacent optical system into the other window to form an image adjacent the other indicating element. Alternatively light from both elements is projected respectively through half the optical system. The deviating means for producing stereoscopic coincidence of images and reticles also adjusts the projected element beam. As shown in Fig. 3 images are formed in the planes of reticles 13 by optical squares 31 and objectives 12 and are viewed in eyepieces 16, a deviator 33 effecting stereoscopic coincidence between the images of the object and of the reticle marks. A tilting plate 40 effects halving adjustment. An index mark 22 on one reticle 13 is illuminated by a lamp 20 light from which is projected by objective 12 and optical square 31 to a small prism 24 whence it is directed via a similar prism 26 to form an image adjacent a scale 39 on the other reticle thus indicating the range. The scale and image may be viewed by an eyepiece 46 or directly in one of the eyepieces 16. Alternatively the index image may be formed by prism 61, Fig. 7, on a rotatable disc 60 having a spiral ranging scale which is rotated manually to coincide with the index 22<1>, Fig. 7a, when the range may be read. The index 22 may have another index adjacent thereto also projected through both optical systems to form an image 71 indicating the accuracy of halving adjustment. In Fig. 6 both index 22 and scale 52 are projected through their respective optical systems and are imaged adjacent one another on a screen 55 by reflectors 53 and lens 54, range observation being effect at 56. Specifications 605,481, 605,482, 605,484, 605,485 and 605,486 are referred. to.