Device in optical representation systems of a motion picture or movie camera

Device according to at least one of the preceding claims characterised in that the movable disc (4;

• 4a, 4b, 4c) is moved at least at times by the drive device (7, 71-75).

Device according to at least one of the preceding claims characterised in that the movable disc (4;

• 4a, 4b, 4c) is deflected so that it is operated in the normal speed range of the film camera in the resonance vibration mode.

Device according to at least one of the preceding claims characterised in that the drive device (7;

• 71-75) is connected through a gear mechanism to the film transport mechanism (52) of the film camera.

Device according to at least one of the preceding claims characterised in that the drive device (7, 71-75) consists of at least one eccentric motor (71, 72) which is connected directly or indirectly to the movable disc (4, 4a, 4b, 4c).

Device according to at least one of the preceding claims characterised in that the drive device (7, 71-75) consists of at least one piezo element (73) connected to a side edge of the movable disc (4, 4a, 4b, 4c).

Device according to at least one of the preceding claims characterised in that the drive device (7, 71-75) acts through an inductive or capacitive field contactlessly on the movable disc (4, 4a, 4b, 4c).

Device according to at least one of the preceding claims characterised in that the spacing between the movable disc (4, 4a, 4b, 4c) and the stationary disc (5, 5a, 5b) is minimal.

Device according to at least one of the preceding claims characterised in that the movable disc (4, 4a, 4b, 4c) is positioned so that the movable disc (4, 4a, b, 4c) is movable solely in the plane of the disc.

Device according to at least one of the preceding claims, characterised in that the movable disc (4, 4a, 4b, 4c) executes an eccentric circular movement.

Device according to at least one of the preceding claims characterised in that the movable disc (4, 4a, 4b, 4c) executes an irregular movement.

Device according to at least one of the preceding claims characterised in that the movable disc (4, 4a, 4b, 4c) executes a motion which is similar to the movement of an arm of a four-armed gearing.

Device according to at least one of the preceding claims characterised in that at least a part of the side edges of the movable disc (4;

• 4a, 4b, 4c) is supported elastically (91-96) so that the movable disc (4;
• 4a, 4b, 4c) is resiliently mounted in the plane of the disc.

Device according to at least one of the preceding claims characterised in that the movable disc (4a, 4b, 4c) consists of two parallel translucent plates (4a, 4b) whereby an inner side has a light-scattering surface, and of a cement material (4c) which bonds the two plates (4a, 4b) together.

Device according to at least one of the preceding claims characterised in that a light source (19) inside the camera lights up the stationary disc (5;

• 5a, 5b).

Device according to at least one of the preceding claims characterised by an arrangement of the movable disc (4, 4a, b, 4c) which faces the camera lens (10) with its non-matted side, and of the stationary disc (5, 5a, 5b) which faces the matted side of the movable disc (4, 4a, 4b, 4c) with its format marks (8, 81, 82).