OLYMPUS olympusCompurShutter free download

File name olympusCompurShutter.pdf

Compur Shutters Compur and Compur Rapid shutters represent the most advanced commercially available interlens shutters and, apart from a recent development marketed in the United States, have for a number of years formed the mainstay of many of the better-class miniature cameras which for one reason or another utilize an interlens shutter. One of the advantages which this type of shutter offered to the camera manufacturer was its ready availability in a complete unit form. In many cases the manufacturers would buy suitable shutters for the lenses they proposed to use and fit them to an otherwise simple form of focusing mount. In this way they did not have to design a focal plane shutter which, with the interlock mechanism, forces a completely new approach from the designer. Another strong argument for the adoption of the interlens shutter was its very moderate price. The manufacture of Compur and Compur Rapid shutters was a monopoly of the Deckel factory in Germany. The output was sufficiently high to warrant and pay for highly specialized machinery and since the manufacturer was assured of a steady and expanding market he could well afford to keep the price down, thus making it exceedingly unprofitable for anyone to venture into competition. Germany's virtual stranglehold on shutter production was helped by the possession of all relevant patents. The necessity of circumventing these was primarily responsible for the Kodak Supermatic design which made the United States in some small way independent of German production. Now, after the customary 15 years, the patents have become void and at the time of writing, some firms are tooling up for the manufacture of Compurtype shutters. In the Compur and Compur Rapid shutters, one movement is necessary to put the various springs in tension and another, a 118 MINIATURE C A M E R A CONSTRUCTION separate one, to release the mechanism whereby the actual opening action takes place. Apart from this dual action there are three distinct operations which are performed by a single shutter. First is the opening and closing of blades. Second is the action which controls the length of time the blades are in the open position, Opening and closing take the same t i m e but are separated by varying delay intervals to achieve the required exposure. Third is the ingenious mechanism to provide time and bulb shutter settings. The opening and delaying mechanisms are then set aside and a new system of lovers performs the action. Apart from the timing mechanism, shutters of this type carry the diaphragm mounting and set the lens glasses at the correct separation. It required very considerable ingenuity by the designer to house all these elements in the narrow annulus, The blades of both the Compur and the Compur Rapid shutter are made of very thin steel foil between 0.002 and 0.003 in thick, and are pivoted as near to the centre of mass as possible (particularly in the case of the Compur Rapid). The blades are moved by a ri