between partition plates 24 and 25 in film cartridge assembly housing section b and exposure window 36 is provided in each partition plate 24 and 25 during photography film cartridge assembly housing section b swings clockwise in relation to camera body a and advances or withdraws from camera forming space c refer to fig3 a thereby causing reflecting mirror 16 to enter camera forming space c as a result a photographic light path is provided between objective lens 11 and disk type film 4 referring to fig7 which shows the camera shutter charging mechanism which is actuated in response to the advancing operation of disk type film 4 by one frame through the one step rotation of rotor 34 of the stepping motor the shutter mechanism is illustrated in the condition of the mechanism prior to shutter charging when rotor 34 of the stepping motor rotates clockwise by one step or increment as shown in fig7 disk type film 4 is advanced by one frame concurrently however a charge interconnecting lever 40 is swung counter clockwise against the force of a biased spring by teeth or projections 37 which are integrally formed with and equally spaced along the periphery of film advancing rotor 34 so as to face the positions of film frames whereby the leading shutter plate 41 of shutter 32 is pushed leftwards projection 41a formed on leading shutter plate 41 pushes trailing shutter plate 42 leftwards at the same time to press a flange portion 42a on plate 42 against the magnetic pole of an electromagnet 39 to cock the shutter leading shutter plate.