Patent GB-388644-A (GB)
Title: Improvements in reflex cameras provided with movable mirrors
IPC: G03B19/12
Filed: 1932-06-27
Abstract: 388,644. Photographic cameras. WEISSE, E., 1, Ludwig-Hupfeld-Strasse, Leipsic, Germany. June 27, 1932, No. 18160. Convention date, June 27, 1931. [Class 98 (i).] A reflex camera comprises a mirror which is inclined to the optic axis of the objective and is capable of a turning movement so as to throw the image alternatively on to the focusing screen or on to a sensitized plate, film, &c. Fig. 1 shows one form in which the mirror 2 is carried on a spindle 3 disposed in the optical axis of the objective 8 and adapted to be turned in one direction to throw the image on to a focusing screen and in an opposite direction to throw the image on to a film carried by spools 35, 35<1>. A shutter comprising a pair of segmental cylinders 4, 5 carried by sleeves 4<1>, 51 is disposed around the mirror. The spindle and sleeves are furnished with segmental gears 13, 14, 15 meshing with gears 22, 20, 18 integral with locking-plates 25, 21, 19. The parts 25-20 are rigidly connected and form a housing for a spring 26 connected at one end to the housing and at the other to a sleeve 27 integral with a winding knob 28. Relative adjustment of the members 4, 5 is effected by a knob 16, shaft 17, and clutch pins 31. In operation, the knob 28 is turned to wind the spring 26 and is held by a ratchet 29 and pawl 30 ; upon actuation of a releasing device, the spindle 3 is turned through half a revolution to direct the image towards the film, the shutter is then actuated and finally the spindle 3 is turned through a further half revolution. A mirror 12 is arranged outside the objective to give a correct picture ; the mirror is carried by a ring 10 whereby it may be turned in any direction and may be folded down about a hinge 11 to cover the lens. Fig. 6 shows a modification in which the shutter comprises an endless band 68 surrounding the film 73 and formed with an exposure aperture, the band being driven through worm gears 66, 64 from a gear 62, Fig. 9, driven in one direction through a clutch 63 by a member 53. The mirror is carried by a spindle 52 fitted with a segmental gear meshing with a gear portion 53<1> on the member 53. The member 53 is turned, by hand, in the direction I until a spring detent 61 engages a notch 59. During this movement the mirror 38, Fig. 6, is turned towards the focusing screen 78 and is locked by a member 52<1>, Fig. 9. Upon release of the detent 61, a spring turns the member 53 in the direction II causing first the mirror to be turned through half a revolution and then the actuation of the shutter. To enable the picture to be viewed correctly, a pair of mirrors 80, Fig. 6, connected by a member 81 are disposed adjacent the screen 78. A yellow filter screen 75, pivotally supported at 76, may be moved behind the lens by a lever 77. The reversing-mirror outside the objective may be formed of two parts 441, 4411, Fig. 7, which are adjustably inclined by wedges 51, 51<1> actuated by a screw 50, to enable stereoscopic half pictures to be taken. Fig. 10 shows a further modification in which the camera comprises three telescopic portions 82, 82<1>, 82<11>, the central portion 821 carrying the lens 84 and mirror 83, the upper portion 82 the focusing screen 85, and the lower portion 82<11> the film &c. 87. The parts 82, 82<11> are adjustable symmetrically with respect to the part 821 by cam-and-slot mechanism, for focusing, the lens being fixed and countersunk so as to be covered by the parts 82, 82<11> when closed. The lens is furnished with a shutter comprising blades pivoted to an outer ring and furnished with pins engaging slots in an inner ring, the rings being driven from a control member 98 through interrupted gears. The mirror 83 is actuated from the member 98 through a member 99.