Abstract: A stereo slide mount system that can reproduce an accurate stereo effect to facilitate a mounting operation and accurate positioning. The stereo slide mount has curved lateral ends facilitation insertion in a slide mount holder. A set of plural types of stereo slide mounts 1 (#0 to #n) in which the width W of windows step wisely decreases with each mount having the same window pitch Pw and different window widths W. A base frame is provided with positioning pins for engaging perforations on the film, and a cover frame is provided with pin holes to be engaged with the positioning pins. The positioning pins and the pin holes are provided at positions such that the inner vertical edges of the windows are brought into agreement with the inner edges of the pictures of the film. The stereo slide mount having smaller width windows has an increased gap width (P0, P1, P2, . . .

Abstract: Viewing apparatus including a transparency viewing apparatus (18, 19) and an electronic data display (58) unit mounted, preferably side-by-side in a housing.

Abstract: A low-cost compact slide presentation toy offering combined slide projector and viewer function by integrating a slide projector section and a slide viewer section with a single housing. Both sections share a common slide recieving slot so that simulataneous viewing and projecting is made possible by means of a novel rotatable slide member which carries a plurality of image cells in a diametrically opposite manner. Also, images to be viewed or projected can be changed by simply rotating a slide member without the need of actually removing a slide from the device. This device is particular attractive for young children.

Abstract: A film viewer into which is loaded a cartridge which has a spool for taking up a film, a door provided at a film entrance/exit, and an engagement shaft for opening and closing the door, the film viewer being used to view a film which is wound on the spool and removed from the cartridge, the film viewer including: a cartridge accommodating portion which accommodates the cartridge; a rotating shaft provided in the cartridge accommodating portion and engaging the spool when the cartridge is accommodated into the cartridge accommodating portion; a film accommodating portion which accommodates the film removed from the cartridge; and a window portion provided between the cartridge accommodating portion and the film accommodating portion, the film being viewable through the window portion.

Abstract: A hand-held microfilm reader comprises an elongate body formed by two parts connected together at one end and separated at the other ends to form a slot. A microfilm sheet can be inserted in the slot with a translucent screen being provided to one side of the slot and a magnifying system to the other side of the slot. An electric light bulb is provided behind the translucent screen to illuminate the screen and the sheet and a clamping device is provided for releasably clamping a sheet against the translucent screen when a required portion of the sheet is in the field of view of the magnifying device.A translucent cover may be provided in the part carrying the screen to allow ambient light to the screen to illuminate a microfilm should the electric light system fail.

Abstract: A magnifying device for use with a hand-held video display apparatus or the like having a generally rectangular housing and a video display visually observable from externally of the housing. The magnifying device includes a frame adapted for releasable mounting on the video display housing, and has a magnifying lens adapted to overlie the video display and effect magnification of the video display during operation when the magnifying device is mounted on the video display apparatus.

Abstract: A display system having a single-frame transparency which contains four independent images, each of the images having spaced apart groups of pixels interlaced with the groups of pixels from each of the other images, each of the images being selectable for projection by a movable grid mask, is provided. A method for preparing and displaying four images from a single-frame transparency is also disclosed. The single-free transparency having interlaced groups of pixels from four individual images is formed from four individual transparencies having a copy pattern formed thereon, the copy pattern being divided into spaced apart square shaped groups of pixels defining a matrix of translucent optic segments.

Abstract: The viewer includes a main body defining a horizontal opening within which a photographic disc is rotatably supported. A light source below the horizontal opening projects the viewed image onto a magnifier lens located above the opening. A viewing port renders the image identifying number on the disc visible. A switch control automatically closes a switch upon grasping of the handgrip portion of the main body. The control is inherently biased to a switch opening position.

Abstract: An internally-illuminated medical data card in a credit card format containing a summary of the medical history of the bearer germane to his existing medical condition. The card, which is of laminated construction, includes a plastic core panel having light-transmitting properties, one face of the panel having formed thereon a metallized layer functioning as a double-faced mirror. Mounted on the layer and on the other face of the panel, respectively, are front and rear film transparencies containing medical data in a directly legible scale, the combined data affording the required summary. The long edges and one end of the panel are in a concave formation to define reflective convex terminations whereby light entering the remaining flat end is transmitted through the panel and is reflected by the convex terminations and by the inner face of the mirror to provide multiple internal reflection, causing the light to illuminate the front transparency to enhance its readability.

Abstract: A portable transparency viewer including a body having a fixed imaging screen with a light source disposed therebehind within the viewer body. Also held within the viewer body is a selectively energizable power source for illuminating the imaging screen. An adjustable magnifier is pivotally attached to the viewer body overlying screen in movable and parallel spaced relation thereto. For viewing slides and filmstrips, an auxiliary removable magnifier is provided which is adapted to be releasably engaged and retained on the viewer body over the viewing screen. The auxiliary magnifier includes a slide carrier for selectively introducing slides between the lens of the auxiliary magnifier and the imaging screen of the viewer body. The auxiliary magnifier further includes an inlet and an outlet positioned on opposite sides of the housing so as to permit the passage of a filmstrip therethrough.

Abstract: A compact, handheld viewer adapted for use with photographic transparencies which are located within a film cassette in roll form, in a strip containing a plurality of individual scenes, or individually mounted transparencies. The viewer includes a manually operable drive system for selectively driving either a film take-up reel, for withdrawing film from a film cassette and advancing it through a projection station, or a film spool for rewinding the film into the film cassette.

Abstract: A portable, easy to use photographic viewer for use particularly by medical and dental professionals when required. The viewer is light weight and includes a light source, a photographic imaging screen, clip to retain the photographic slides or negatives in position and a support for maintaining the viewer in any desirable position.

Abstract: A slide viewer or projector is provided with a device for preventing two or more slides from attempting to enter into the viewing or projecting area simultaneously. The device comprises a barrier with a wiper pivotally mounted thereon. The barrier and wiper are spaced apart from the path taken by a slide so that the slide pivots the wiper against the action of biasing means and then the barrier is raised into engagement with the upper surface of the slide and this allows the wiper to wipe over the upper surface of the slide to "kick off" any other slide resting on the surface.

Abstract: Apparatus for viewing a transparency includes a rechargeable battery and a telescoping lens housing which moves inwardly and outwardly with respect to a housing in which is disposed the rechargeable battery, a light source, and a solid diffuser/reflector block for diffusing and reflecting light from the light source over substantially the entire area of the transparency.

Abstract: A portable microfiche viewer is provided for viewing a selected image frame of a microfiche arranged in a cylindrical configuration. The viewer comprises a cylindrical translucent outer wall, a cylindrical transparent inner wall positioned within the outer wall and a transparent cylinder adapted to be manually rotated and axially movable within the inner wall. A microfiche to be viewed is positioned on the periphery of the cylinder and is rotatable therewith for positioning a selected column of the microfiche into a viewing path or aperture extending perpendicularly to an optical path of a lens means mounted on the outer wall. The lens means is movable in a path parallel to the viewing path to a selected row of the microfiche for viewing the selected image frame of the microfiche directly through the lens means.

Abstract: A hand held microfilm reader wherein the film is maintained within the reader housing and the controls for positioning the film are easily manipulated by one hand. An optical system provides an intense automatically focused image projected onto a screen for viewing by the user. The light source is a conventional lens end bulb that has been rendered uniformly directional by its having been mounted in pre-aligned relationship with respect to a clip which is configured to be precisely registered with remaining portions of the optical system.

Abstract: A portable microfilm viewer for viewing a microfilm contained in a cassette. The viewer includes a housing with a lens system mounted therein. The cassette is removably received on a film transport mechanism which both supports and drives the film. A source of rotary motion is fixedly mounted on the housing and a bidirectional engaging device couples the rotary output to the film transport means for selectively transporting the film of the cassette in either of two directions across the lens system. The source of rotary motion can be a manual wheel or a motor device. A counter can be included for determining the film frame being viewed and for setting a desired film frame to be viewed, whereby the device will automatically stop when the desired film frame is in view. In an embodiment of the invention the microfilm viewer can also accommodate microfiche cards which can be viewed through the same lens system.

Abstract: An astronomical optical simulator made of a tubular body with an eyepiece at one end and a light source at the other with a slot in the tubular member to receive an opaque disk having openings distributed to simulate an array of astronomical bodies. The openings modify and pass light from the source giving the impression of an array of astronomical objects to an observer looking into the eyepiece.

Abstract: A film viewer wherein a housing is provided with a viewing window, a film holder is removably positionable in the housing spaced from the window, and illuminating means provided in the housing for passing light through the film holder to the window.