Patent GB-1034178-A (GB)
Title: Aperture and exposure control mechanism for photographic camera
IPC: G03B7/12
Filed: 1963-06-17
Abstract: 1,034,178. Photographic cameras. EASTMAN KODAK CO. June 17,1963 [June 27,1962], No. 24004/63. Heading G2A. A photographic camera has a first "daylight" mode of operation in which the shutter and diaphragm are inter-related with an exposure meter so that the exposure time and aperture are automatically adjusted as functions of scene brightness and a second "flash" mode of operation in which there is a predetermined exposure time and the diaphragm is coupled to focus adjusting means so that the aperture is adjusted as a function of focus adjustment. For "daylight" operation, the operator depresses a finger piece 99 against the action of spring 54, such that lugs 53, 50 release arms 71, 77 and lug 32 respectively. Sensing members 13 and 14 are released for upward movement by springs 73 and 94 toward the output pointer 23 of a moving coil 22 energized according to light incident on a photo-cell 22. The upward movement of the members 13 and 14 is determined by cam surfaces 66 and 87 repsectively. The member 14 sets the aperture by means of a pin 89 engaging slots 91 in plates 92, 93. The member 13 is set in an appropriate position with respect to an extension 38 on a speed setting lever 33 as a function of the light incident on cell 20 to provide the correct time exposure. As finger piece 99 is further depressed, the edge 100, Fig. 4, causes release member 45 to move clockwise to release a lug 31 from a shoulder 49. A spring 27 rotates lever 25 counter clockwise to actuate shutter 16 by means of arm 30, the speed being determined by the relation of lug 32 and a nose 34 which depends on the position of cam 39, on sensing member 13, relative to extension 38. When the finger piece 99 is released after actuation of shutter 16 spring 54 returns the finger piece to normal position, the sensing members 13 and 14 being moved downward by the arms 71, 77 out of engagement with pointer 23. If an automatic film advance is provided, the movement of sensing members 13 and 14 takes place together with setting of shutter 16. In order to make a flash exposure a selector ring 101 is rotated clockwise to position flash indicator mark 102 opposite index 103, such that a slot 106 on ring 101 cams a pin 64 on sensing member 13 downwardly. The sensing member 13 is thus moved downwardly to position upper portion of cam surface 39 under extension 38. The lever 33 is now unobstructed, since arm 71 is removed from lug 53 and a predetermined speed for flash exposure is obtained. The aperture in diaphragm 15 is set by a pin 107 on sensing member 14 extending through a slot 108 into a position relative to cam (not shown) associated with selector ring 101 in the manner described in Specification 914, 516. A latching means 109 is provided which permits setting of film guide numbers 110 on focus ring 111 in accordance with such setting and further movement of index 112 and ring 111 for focusing. As finger piece 99 is depressed lever 33 rotates counter clockwise, while the sensing member moves upwards as for "daylight" operation and by means of pin 89 actuates diaphragm blades 92, 93. Sensing member is arrested when pin 107 engages the cam, (not shown), associated with selector ring 101.