Патент USA US2123465код для вставки
July 12, 1938. F. w. GEHRKE RANGE FINDER Filed April 17, 1934 r-ß-A. By 2,123,465 Patented July 1.2, 1938 2321465 UNITED STATES PATENT- OFFICE 2,123,465 RANGE mmm. Friedrich Wilhelm Gehrke, Munich, Germany, assigner to Agfa Ansco Corporation, Bingham ton, N. Y., a corporation o! New York' Application April 1i, 1934,ser1a1No.721.o54 " f 1n Germany April zo, 1933 2 claims. (ci. 95-_40 My present invention relates to arange finder. One o1' its objects is a process oi measuring distances. Another object isarange ñnder. Still another object is a range finder which can be 5 combined with a camera in a simple and eili cientl structure. Further objects will be seen from the detailed speciñcation following here after'. » The method hitherto practiced for measuring ¿o parallactic angles was to turn one of two mirror planes inclined at an angle oi' 45° to the optical Fig. 2 shows diagrammatically a front view oi’ the arrangement shown in Fig. 1, the dotted position of' the prism in~ Fig. l being omitted; Fig. 3 shows diagrammatically a front view of a modiiication oi the arrangement according 5 to F18. 2; Fig. 4 shows diagrammatically a range finder mounted on a camera, the range iinder being shown in horizontal section on line 4-4 of Fig. 5; 10 Fig. 5 shows a front view oi' the arrangement axis of the camera until the obJect whenviewed ' shown in Fig. 4, and directly was in register with the image oi’ the object reflected by the two mirrors. Another 15 >way was to compensate for the parallaxes by a _ controllable optical-element (lens sections, cyl inder lenses or Wedges). 'I_'he invention relates to'this latter kind of distance measuring. According to the present invention the paral 20 lactic angles are measured by displacing a nega Fig. 6 shows a perspective view of the arrange ment shown in Fig. 4, the same numerals desig nating the same parts. 15 l is the_negative lens system and 2 is the positive lens system of the Galilean ñnder. The negative‘lens 3 and the base-forming prism I, are-mounted so as to be movable with relation to the stationary positive lens 2. The prism as 20 tive lens or lens section mounted before the shown in'dotted lines in Fig. 1, may be placed base of the range ilnder with- relation to a. ,in' thev path of the rays projected through the positive lens placed behind the base of the range finder. Furthermore according to the invention the range finder isy connected with a Galilean view finder. To this eiiect the prism which pref erably forms the base of the whole instrument is mounted so as to be movable in direction of the » base together with the negative lens not forming 30 a part of the finder in such a manner that the Galilean view ilnder can be »used alone or in connection with the range ñnder. The paral lactic angles are measured by'means of half the negative lens which isl movable perpendicularly 35 to the direction oi vision vand constitutes either the lower or the upper portion oi.' the field of vision of the ilnder. The stationary positive lens may simultaneously’be a part ci the Galilean view ilnder and of the range finder.v 40 -The principal advantages ofthe new range finder according to the invention consist in the' great and -clear picture'which is obtained by `the Galilean view finder. The base oi the range finder is marked B. From Figs. 2 and 3 it is ap parent that the upper part of the image viewed g5 through the finder is directly seen,A i. e._ straight through the'tlnder, whereas the'lower part is seen through the prism and the negative lens 3. The negative lens 3 must be displaced until the two images are in register. Fig. 3 shows a modi- '30 flcation, wherein l' is the upper part of nega tive lens I. The lower part of lens l has been removed. - Figs. 4, 5 and 6 show the range ñnder accord ing to this invention mounted on a camera. I g5 is the negative lens system and 2 is the positive lens system of the Galilean ilnder. The prism ' 4 of the range finder is embraced by a mount I which also embraces the negative lens 3 oi' the _finder but admits all' the light rays necessary 40 for distance measuring. -The'refore the mount C »embraces the .prism in the embodiment shown arrangement of' the -lens elements. Due to its Figs. 4 to 6 only on its lower part. The mount compact construction the range ñnder .is par . in 45 ticularly suited for use in photographic cameras. 6 is pressed against an abutment 9 by means oi'. the spring 8. The abutment 9 may be moved ß‘ In addition, combining the range finder with a the distances smaller than infinity by any v Galilean view ñnder provides -the possibility of for. utilizing’the- finder alone 'or‘ together with aV suitable means coupled with the objective mount, for instance, as shown in Fig. 4 by one of the range n_n'der. ' . y struts connecting the objective panel with the ¿o The invention will now be described with ref camera casing. ' 1 5° erence to the accompanying drawing in which In order that with the desired long base ot' the A Fig. 1 shows diagrammatically a section'view range ilnder the negative lens oi’ the Galilean of the i‘lnder and the range iìnder on the -line iinder be arranged at a suiilciently long distance i-'I of Fig. 2, the latterbeing removed 'from `-from the eye-lena, without necessity of giving u the path ofthe rays of the finder; " the camera,’in direction- oi the optical axis, the' u . 2,123,465 ' extension of the Galilean ñnder, it is advisable to place the negative objective lens of the finder in a mount which may be extended in the way of a-telescope as shown in Fig. 4. ' What I claim is: - 1. A range finder which comprises in com tive lens laterally in and out Aof the ñeld ñnder. - ' OI" busti i .2. In combination with a camera, a finder which comprises in combination; a positive lens system, a negative lens system arranged at a‘vv substantial distance infront ,of said positive lens bination, a positive lens system, a negative lens ' system so that both lens systems form a Galilean system arranged at a substantial distance in - view ñnder, means for moving said negative lens iront of said positive lens system and limiting ‘ system in direction of its optical axis, a prism 10 half of the picture ñeld, said positive lens sys-- teml and negative lens system forming a Galilean ñnder, a prism constituting a parallelopiped ar ranged laterally to said ñnder and limited by oonstituting'a parallelopipedV arranged laterally 10 to said ñnder limited by planes inclined tothe optical axis of said finder, a negative lens ar ranged before the inclined plane of said prism two planes inclined to the optical axis of said I iremote from said ñnder, and meansconnected. with the objective mount of said camera for 15 finder, a negative lens arranged before the in 15 clined plane of said prism remote from said Ádisplacing said prism and said negative lens lat erally towards and away from said finder. finder, said prism and said negative lens limit ing the other half of the Vpicture ñeld, and FRIEDRICH WILHELM GEHRKE. means for displacing said prism and said nega.