Abstract: A roll film magazine frame for supporting a film spool which receives a roll film and for inserting through an insertion opening into a shaft of a micro roll film reading device, the roll film magazine frame comprises a polygonal body part having a plurality of sides and a plurality of corners each between two adjacent sides, the body part having a recess provided in one of the sides for introducing a film from a film coil into the reading device, an opening provided in another side for introducing a friction member of the reading device for contacting a roll film on the film spool, the side of the body part including a further side which is accessible from outside when the magazine frame is inserted in the shaft, the further side being formed as a cover which is turnable outwardly away of a remaining portion of the body part so as to allow withdrawal of the film spool from the body part and insertion of another film spool into the body part.

Abstract: An apparatus for sensing microfilms is provided in addition to visible light with a projection lamp for radiating infrared rays which pass through a cold-light mirror to a platform on which a microfilm is disposed. The apparatus is further provided with a projection lens positioned above the microfilm platform. The path of rays is directed from the microfilm platform through the projection lens and then is projected onto an image screen or other sensing surface, for example CCD-device. For adjusting the apparatus for various light spectrum combinations the apparatus is provided with at least one infrared component-reflecting mirror which is displaceable or pivotable to and from the path of illumination rays radiated from the projection lamp.

Abstract: In a microfilm reader, an objective lens tube removal or exchanging arrangement which includes a cylindrically shaped supporting casing for the objective lens tube. The objective lens tube is, for focusing purposes, slidably adjustably mounted along its optical axis in the cylindrically shaped supporting casing. The cylindrically shaped supporting casing has an opening which is sufficiently large to permit the removal or exchange of the objective lens tube therethrough in a direction substantially normal to the optical axis of the objective lens.

Abstract: A microfiche reader and/or enlarger has a housing provided with an opening. The microfiches are stored in hard-cover files having a pair of covers between which a series of pockets is located, with the individual pockets being connected to one another and the two end pockets each being connected to one of the covers. When the covers are moved from parallel to coplanar position the pockets assume a fan-shaped outline; when the file is attached to the opening in this position with the pockets projecting into the housing, inner open ends of the pockets are accessible to a gripper on a pivot arm which can be moved opposite any selected one of the open ends. The gripper can then extract the microfiche from the selected pocket and subsequently reinsert it thereinto.

Abstract: A microfilm reader for enlarged projections of any desired micropicture among a number of such pictures on a microfilm. The microfilm is interleaved between two movable plates. A slidable support for the image forming objective is pressed with a tensioned spring against the upper plate. The slidable support can be connected to a slide lever for effecting its placement in proper position. Two arms of a spring can be employed for mounting the slidable support and for tilting it around an axis essentially parallel to the cover plate.

Abstract: A microfilm reader is provided which comprises two casings. The first casing comprises selection means for selecting a micropicture as well as means providing a projection beam for imaging the positioned micropicture through at least one selected orifice in the first casing. The second casing comprises at least one orifice for receiving the projection beam carrying the micropicture information and projection means for displaying the received micropicture information. The two casings can be attached in dual position and by proper positioning of mirrors the projection beam passes through matched orifices of the two casings. The remaining orifices are covered with covers.

Abstract: Microfilm is inserted between two or more parallel, transparent, laterally invertible support plates placed in a light path emanating from a light source and travelling to a projection objective. The plates are placed in a tray which can be slided in two directions normal to the light path. The microfilm located more closely to the reader is in proper position for one or more projection objectives. For reading the microfilm located on the other side, the plates are inverted in order to bring this film in proper reading position.

Abstract: A collapsible microfilm reader having a lower body part with a micro-fiche projector and a cover hinged thereto and having a rectangular projection surface or screen on its inner surface which is operatively positioned when the cover is in its open position. The hinge or hinges which connect the body and cover are readily disconnectable and connectable so that the cover can selectively be mounted on the body with the long or short axis of the screen aligned with the central axis of the projector thereby permitting the optimum projection of micro-fiches of different formats by changing when necessary the orientation of the positioning of the cover on the body rather than requiring different positioning of micro-fiches of different formats with respect to the projector.

Abstract: Portable microfilm reader having a body with a microfilm holder, a projection lamp, a foldable reflecting mirror, a hinged cover, and a projection surface or screen on the inside of the cover. The invention provides means for automatically erecting the mirror when the cover is opened, and automatically folding the mirror when the cover is closed. Means is also provided for automatically turning the projection lamp off when the cover is closed.

Abstract: The rear-projection viewing screen receives light incident upon its back side from the objective of a rear-projection projector and forms a corresponding image visible to a human eye viewing the front side of the viewing screen. The viewing screen is comprised of a lens-aperture matrix and an optical system cooperating with the lens-aperture matrix. The optical system serves the function of a lens matrix comprised of lens-matrix elements which focus the light from the objective of the rear-projection projector through the apertures of the lens-aperture matrix. The optical system furthermore serves the function of a field lens operative for gathering the light emanating from the objective of the projector and deflecting such light in direction toward the optical axis of the objective so as to increase the amount of light from the marginal portions of the viewing screen reaching a viewer's eye located on such optical axis.

Abstract: A continuous microfilming camera wherein the film is trained over a large driven roller so that its emulsion-coated side faces a lens which is installed in a tubular mount. The roller is rotatable about a fixed axis and the mount is reciprocable in the housing of the camera substantially radially of the roller. Two positioning rolls at the front end of the mount contact the emulsion-coated side of that portion of the film which is trained around the roller and are biased against the emulsion-coated side by springs which react against the housing and bear against the mount. The rolls are disposed at the opposite sides of the optical axis of the lens, and the driven roller cooperates with two guide rollers which insure that the film is trained over the major part of the peripheral surface of the driven roller.