Patent GB-1138610-A (GB)
Title: Photographic camera
IPC: G03B19/12
Filed: 1966-07-14
Abstract: 1,138,610. Single lens reflex cameras. COMPUR-WERKG.m.b.H. July 14, 1966 [Aug. 30, 1965], No. 31653/66. Heading G2A. In a photographic camera having a pivotable reflex mirror 26 and an objective shutter settable to different exposure periods and openable for an interim inspection of a photographic image, there is provided an electrical system which produces the sequence of operation of the mirror and shutter necessary for inspecting an image and then effecting an exposure. The camera is shown Fig. 1 with the members in the positions they take up immediately after an exposure has been performed, shutter blades (82) Fig. 4 (not shown) and diaphragm blades (138) Fig. 2 (not shown) being open to allow of inspection of the mirror 26 for focusing the image by turning a focusing ring 66. The shutter is then cocked and the film fed by rotating a knob 24 clockwise in Fig. 1, the mirror 26 and a light baffle 32 remaining in the positions shown. Shutter cocking. Rotating the knob 24 rotates, via gearing 24g, 74, 74a, 72, a cocking ring 72a Fig. 3 to the dotted line position. Toothed pinions 98, 114 are driven by the ring 72a and rotate driving plates 92, 94 to a cocked position in which they are locked. The plates move two shutter blade rings (84), (86) (Fig. 4) counterclockwise thus rotating the shutter blades (82) in their opened condition. The knob 24 is released and returns to its original position, as does the ring 72a. The shutter speed and diaphragm aperture are set by means of rings 68, 70. Exposure making. The trip 78 is depressed, freeing the plate 92 to run down in a clockwise direction, thereby turning the blade ring (84) to close the shutter blades and terminate the interim inspection. As the trip is depressed, a switch A-B is changed over and an electromagnet 48 Fig. 1 is energized, thereby freeing parts 40a 40, 4& to rotate and raise a lever 34 which in turn raises the mirror 26 and the baffle 32 out of the exposing ray path. Movement of the mirror is followed by an arm 140c of the diaphragm control ring (140) (Fig. 2) so as to allow the diaphragm to take up its pre-selected position. Movement of the lever 34 changes over a switch C-D resulting in an electromagnet 130 Fig. 3 being energized. This frees the driving plate 94 to rotate clockwise (as seen), thereby rotating the blade ring (86) clockwise to open the shutter blades for exposure, rotation of the ring (86) changing over a switch E-F to energize an electromagnet 124 to lock the plate 94 when the blades are open. The electromagnet 124 is de-energized when a condenser (172) Fig. 12 (not shown) is fully charged, the time taken depending on the exposure time set, variation in which alters the value of a resistance connected in series with the condenser. The plate 94 is thus free to continue clockwise movement, while the ring (86) rotates anti-clockwise to close the blades. This movement changes over the switch E-F again and the electromagnet 124 changes over a switch G-H to energize an electromagnet (50) (Fig. 12). This allows the members 40a, 40, 40b to pivot the control lever and hence the mirror 26 and baffle 32 back to the position shown, resulting in the diaphragm blades being fully opened and switch I-K changed over to release the plate 92 to rotate from its cocked position as to turn the blade ring (84) anti-clockwise, thus opening the shutter blades ready for the next interim inspection.