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Aug. 23. 1938. 2,127,925 L, LEAH-‘Z ' COMBINED RANGE FINDER AND VIEW FINDER Filed Jan. 22, 1936 ' Fig.1 _ NVENTOR' BY _- > , , - ATTORNEY ‘ 2,121,925 Patented Aug. 273, 1938 UNITED’ STATES PATENT for-rice " f - 2,121,925 COLIBINED RANGE FINDER FINDER VIEW ' - Ludwig Leits, Wetzlar, Germany, assignor to. Ernst Leitz, G. m. b. 11., (Wetslar, Germany Application January 22, 1986, ‘Serial No. 60,160 , In Germany January 81, 1935 ‘ > I 2 Claims. (cl. 95-44)‘ The object of this invention vis to provide a ' observation through theviewy?nder and which combined direct view ?nder and a basis range - glass body contains or bears the above mentioned . finder in} a unitary construction in which the partly silvered plane. surface. The invention and its objects will be more fully , optical axis of the view ?nder coincides with the 7 _5 direct observation axis of the range ?nder. An understood from the following speci?cation read ‘= other object of the invention is to embody the‘ in connection with the accompanying drawing principles thereof in a construction especially in which Y well adapted for use in miniature or small‘cam eras. Such a combination presents a di?lcult 10 problem because in the ‘view ?nder with direct view it is desirable that there be but little mini fying of the object, whereas in the range ?nder it is desirable that there be but little magni? cation of the object, because naturally one de -15 sires that the two overlapping images shall -be bf the same size. In solving the problem it has been found most practical to select a proportion ' Fig. 1 is a rear view of the view?nder mount‘ ed on a camera. ’ r ‘ Fig.- 2 is a sectional view showinglthe arrange- ' 10 'ment of the parts in a camera. , Fig. 3 illustrates-the partly silvered glass body. Fig. 4 shows certain elements of the view ?nder. , , Referring to thedrawing the numeral I de- 15 notes a photographic camera having an objective l3 and provided‘ with a unitary ?nderhousing between the two incoming images which is usu- ' adapted to be attached to the camera by‘ means ally expressed as 1:1, 1. e. thevimag‘es should of a foot I I. The ?nder housing contains a com; ' .20 be equal in size and this which may be carried 7' bined view ?nder and a range ?nder in accord- 20 ' out with cameras having bodies of relatively ance with this invention. i The view ?nder in cludes a rear transparent member 2 forming an considerabie depth. .In such cameras the con struction has been embodied in a combination of a terrestial telescope and a view ?nder with a 25 mask to de?ne the ?eld'of view. Such a con struction-is however not practical for small carn . eras, i. e. cameras having but little depth of body eye opening it surrounded by a rectangular mark or frame 4 which may simply be painted upon the member 2, and which is indicated by 25 heavy lines in Fig. 2. Suitably spaced in front of the member 2 there is a transparent con- _ because the terrestial telescope is too long and‘ cave glass body 3 provided with a concave partly the distance for the mask ?nder is too short to silvered rectangular frame portion 5 which 30' aiford a simultaneous sharp observation of the frames the ?eld'oi' view seen through the glass 30 ‘mask and the object. body 3. The centres of ‘the two rectangular _ View ?nders, which in accordance with the. frames 2 and 3 are coincidental with the axis “ collimator principle include marks or mask to limit the ?eld of view. such marks or masks be I _ 35 ing imagedv so as to appear at an in?nite dis of the view ?nder and the proportions are such _ that the frame or mark 4 is imaged in in?nity in thepartly silvered portion 5. The frame 4 35 is’located in the focal plane of the frame por tion 5. The construction, function and arrange tance, may be constructed to take up very little space and'may thereiore'be combined with a range ?nder and the combined device used to > ment of the view ?nder so far described is simi advantage with small cameras having but little lar to the photographic view ?nder disclosed in 40 space behind, the objective. The view ?nder the U. S. Patent 2,093,299 of September 14, 1937. 40 ' consists in avknown manner of a frame which ‘In front of the concave glass body I there is carries one or more masks which are re?ected mounted a glass body 8 which consists of two ‘ in in?nity in a curved surface which is partly cemented parts 8a and 6b, which ‘have a com mon inclined surface ‘I provided with a partly silvered and functions in the manner oia con 45 cave mirror. In accordance with this" invention silvered portion la, see Figure 3. To one side 46 . there is mounted a partly silvered plane surface of the glass body 8 there is‘ secured the range in the optical axis‘ of the‘ view ?nder in such *?nder comprising the movable reflecting prism l a, manner that the re?ected image fr m the ~ 8 operated from a part II by means of an arm range ?nder appears as a small insert in he ?eld" I. The part » I0 is actuated by the objective I! 50 ‘of vview seen through the view ?nder. In order in a. known manner. The mark or frame 4,re- 50 to prevent disturbing image contours from ap _ ceives light through the windows I! in Figure 2 pearing in the directly observed image, which so that it may be clearly and sharply observed contours may’ result from the. re?ections from in the partly silvered portion.‘ 5 in which the the range ?nder, the invention includes the use mark 4 is imaged in in?nity,‘ the mark being in focal plane of the portion I. 55 of a glass body which does not obstruct the direct 2,127,925 In operation, when one looks into the view ?nder, one sees in the ?eld of view the image of the rectangular mark 4 as the same is re ?ected in the rectangular partly silvered frame portion I. That is, one sees a rectangular frame the ?eld of view, a wholly transparent glass body in front of the said view ?nder provided with a centrally disposed partly silvered semi-trans parent surface for re?ecting the central portion of the image from the range ?nder into ‘the op formed by the re?ected image of the mark 5 and this frame encloses the view which will be photographed. As the objective is being focused, thefrange ?nder is actuated in a well known tical axis of the view ?nder to appear centrally manner and now one sees inside the re?ected operating the range ?nder. image of the mark 4 two images, one of which is the image of the entire ?eld ‘of view appear~ ing through the view ?nder and the other im 2. In a photographic camera having an objec tive, a combined coincidence range ?nder and a photographic view ?nder comprising a unitary within the framed ?eld of view superimposed thereupon when the said range ?nder is oper ated ‘and means actuated by the objective for 10 , age which is re?ected from the range ?nder is housing having light admitting openings for said ?nders and a single eye opening common to smaller and is only acentral portion of said im age. The small image is now superimposed upon both of said ?nders, said view ?nder including the large image as the objective is being focused. when the objective is in focus the small image coincides completely with the corresponding cen— 20 tral portion of the large image so that one sees in fact only a single image which is that of the ' a transparent ocular member forming an eye opening, a rectangular mark on the objective side of said member de?ning and surrounding said eye opening, ‘a concave transparent member 20 spaced a distance in front of said ocular mem ?eld of view which will be photographed. rI'he ber, a concave partly silvered rectangular frame incoming small image is easily seen as it‘ comes into view and appears within the frame against portion on said concave member facing the said mark for re?ecting the same in in?nity to frame the wholly unobstructed view through the view finder. A diminution of light occurs thus only in the central portion where the two images are ‘the ?eld of view, light admitting side openings in said housing for illuminating the said rectangu lar mark, a wholly transparent glass body in superimposed. front of the said view finder provided with an I claim: 1. In a photographic camera having an objec tive, a ‘combined coincidence range finder and a inclined centrally disposed partly silvered semi transparent surface for re?ecting the central photographic view ?nder, the latter comprising 25 portion of the image from the range ?nder into the optical axis of the view ?nder to appear cen trally within the framed ?eld of view superim a transparent ocular member,‘ forming an eye opening, a rectangular mark on the objective side ' posed thereupon when the said range ?nder is of said member de?ning and surrounding said operated, means actuated by the objective for 35 eye opening, a concave transparent ;member spaced a distance’in front of said ocular member, a concave partly silvered rectangular frame por tion on said concave member‘ facing the said operating the range ?nder and cooperating means on the camera and the said housing for detach ably securing the housing to the camera. LUDWIG LEI‘I'Z. - mark for re?ecting the same in in?nity to frame » FCER'I'IFIICATE or commoner. Patent No.- 2,127,925. ' LUDWIG LEITZ. ' 40 _ August 25, 1958-, It is hereby certified that; 'error appears in the printed specification of the above numbered patent requiring correction as follows: Page _1, first column, line 20, strike out the word "which"; and that the said Letters vPatent should‘oe read with this correction‘ therein that the same may con form to the record of‘ the ease in the Patent Office. Signed and sealed this 11th day of October, A. D. 1958. Henry Van Aradale _( Seal) Acting Commissioner of Patents.