Abstract: A paper sensor apparatus of a laser beam printer includes a LED located on the center of a substrate, obliquely positioned two-facet mirror for reflecting the light from the LED to both sides of the LED, photodiodes for receiving the light, and a paper presence detecting shutter and a paper feeding shutter located between the photodiodes and the obliquely positioned two-facet mirror, respectively for blocking or transmitting the light. Low production cost and an enhancement of productivity can be achieved because the structure of the paper presence detecting sensor and paper feeding sensor can be made cheaply and automatic assembly is possible.

Abstract: A device for recovering information from overexposed regions of image recording emulsions in general, and radiographs in particular includes a light-tight housing the outer surface of which is covered with a layer of lead, a source arranged to project ionizing radiation within said housing, and a removeable cassette which, in use, carries the over-exposed radiograph in close contact with a further film for recording the information. The cassette has a light-tight cover which is displaceable to permit exposure of the further film to an image produced by irradiation of the over-exposed radiograph by the source. The method includes irradiating the over-exposed radiograph, placed in close contact with a further film, by means of a device as aforesaid.

Abstract: A microfiche duplicator exposure station where a copy sheet lies facewise over a master while an elongated lamp shines light through the master to expose the copy sheet. A shutter that controls exposure, includes two plates lying over the lamp and a solenoid that quickly pivots the plates to positions beside opposite ends of the lamp to allow light from the lamp to reach the microfiche. The plates have mirror surfaces extending at an incline of about 60.degree. from the vertical when the plates are at opposite ends of the lamp, to shine light onto opposite ends of the microfiche, to thereby compensate for low illumination thereat produced by an elongated lamp.

Abstract: A printer for exposing photographic material is shown with a printing table horizontally mounted within a cabinet to receive photosensitive material and copy. A transparent plate is pivotably attached to hold the photosensitive material and copy in contact above the table which may be of the vacuum type. The front of the vacuum table may or may not exceed beyond the front of the cabinet. A fixed panel may be provided to support an exposing light above the table, additionally the control panel and shutter mechanism may be part of this fixed panel. A movable plate at least partially opaque to actinic rays may be moved inwardly as the transparent plate is raised. A safelight, viewing or inspection light may be mounted within the cabinet. A lifting and latching handle may be mounted at the front edge of the transparent plate.

Abstract: An exposure system for a microfiche duplicating machine includes a mercury vapor light source and a light transparent platen disposed above the light source for supporting an original microfiche card and a duplicating film card for exposure by the light source. A shutter mechanism is interposed between the light source and the transparent platen to control the exposure of the duplicating film card, and a cover is disposed over the transparent platen to prevent the escape of light from the duplicating machine during the exposure. A mechanical linkage is provided for automatically opening a pair of shutters within the shutter mechanism upon the closing of the cover to initiate the exposure of the duplicating film card. Simultaneously, a timer is energized by the closing of the cover to initiate an exposure timing sequence.