Abstract: A light source apparatus includes: an excitation light source including a laser light source; a first wheel that is controlled to rotate, and includes, in a part of a surface thereof to be illuminated by excitation light emitted from the excitation light source, a phosphor layer to be excited by the excitation light; a dichroic mirror that guides fluorescence emitted from the phosphor layer of the first wheel and the excitation light to an illumination optical system; and a second wheel that is controlled to rotate, and includes a dichroic filter that transmits light having a desired wavelength component of each of the fluorescence and the excitation light output from the dichroic mirror.

Abstract: In an illumination optical system for a DMD type projector, the TIR prism is configured such that a projection line, which is a normal to the total reflection surface vertically projected on the DMD surface, forms an angle other than 90° with a micromirror turning axis, an exit light projection line, which is a principal ray of light beam exits from the total reflection surface vertically projected on the DMD surface, forms an angle of 90° with the micromirror turning axis, and an incident light projection line, which is a principal ray of light beam incident on the total reflection surface vertically projected on the DMD surface, is located on the same side as the exit light projection line with respect to a straight line passing through an end point of the incident light projection line and extending parallel to a long side of the DMD.

Abstract: The auxiliary light source has LED chips respectively emitting red lights arranged therein in an array shape, and has lens cells for parallelizing light arranged therein on the light exit side of the LED chips, for example. The LED chip is arranged in correspondence with each of lenses composing a pair of fly's eye lenses, and the pair of lenses introduces the light emitted from the LED chip into the whole surfaces of liquid crystal panels. A mixing mirror transmits white light emitted from a main light source and reflects light emitted from the auxiliary light source, and mixes the white light and the auxiliary light respectively emitted from both the light sources and introduces the mixed lights into the pair of fly's eye lenses.

Abstract: A fixed image projection system that can project an image for a short or long period of time without damage to the film. The system is comprised of a light source having a halogen lamp and a cold coated reflector detachably mounted on a housing having film guides or rails for receiving a film frame. The housing includes a plurality of whisper fans that draw cool air into the housing and expel it from the opposite sides of the housing to maintain a relatively cool temperature at the film frame. Preferably, the fans have a dual speed control to allow a higher speed as an option. A lens barrel is detachably supported on the opposite side of the housing from the light source and includes movable lenses to focus the image. Images may be fed into the system on a film frame one at a time, or by motorized film canisters that allow forward or backward advancement to a selected image on a roll containing multiple images.

Abstract: A fixed image projection system that can project an image for a short or long period of time without damage to the film. The system is comprised of a light source having a halogen lamp and a cold coated reflector detachably mounted on a housing having film guides or rails for receiving a film frame. The housing includes a plurality of whisper fans that draw cool air into the housing and expel it from the opposite sides of the housing to maintain a relatively cool temperature at the film frame. Preferably, the fans have a dual speed control to allow a higher speed as an option. A lens barrel is detachably supported on the opposite side of the housing from the light source and includes movable lenses to focus the image. Images may be fed into the system on a film frame one at a time, or by motorized film canisters that allow forward or backward advancement to a selected image on a roll containing multiple images.

Abstract: A fixed image projection system that can project an image for a short or long period of time without damage to the film. The system is comprised of a light source having a halogen lamp and a cold coated reflector detachably mounted on a housing having film guides or rails for receiving a film frame. The housing includes a plurality of whisper fans that draw cool air into the housing and expel it from the opposite sides of the housing to maintain a relatively cool temperature at the film frame. Preferably, the fans have a dual speed control to allow a higher speed as an option. A lens barrel is detachably supported on the opposite side of the housing from the light source and includes movable lenses to focus the image. Images may be fed into the system on a film frame one at a time, or by motorized film canisters that allow forward or backward advancement to a selected image on a roll containing multiple images.

Abstract: Apparatus for converting an overhead projector to use photographic slides includes a fresnel disk that shortens the illumination convergence point to match the focal length of a typical slide projector. The apparatus includes a base that covers the platen of the overhead projector to prevent illumination spillover, and supports projection optics over an aperture that admits illumination for projecting magnified images of slides onto a vertical viewing surface.

Abstract: Apparatus is described for the detailed viewing of a strip of 35 mm slide film which is enclosed in a transparent jacket. The apparatus includes a projector with a film gate which is wide enough to pass the jacket, and which projects sufficient area to include the frame number which lies under each picture frame. The apparatus enables a person to view the details of a developed roll of slide film, in its jacket, and to select particular frames for making prints or mounted slides.

Abstract: A slide projector has a light table oriented at 60.degree. to a generally horizontal base and connected thereto by a detachable connector. The light table has a tray mounted thereon for movement into mutually orthogonal directions parallel to the plane of the light table and supported by a counterweight, the tray receiving a planar slide holder whose slides and windows are alignable with a window in the light table. A projection lamp is located at the front side of the window while the projection optics are located at the rear side of the window.

Abstract: A device for supporting a transparency on a top surface of an overhead projector is foldable from a compact unit into a structure having a planar base with an indentation for receiving a transparency and legs which are pivotally mounted on the base and rest on the top of an overhead projector to position the transparency at a specific spacing therefrom. Other pivotal elements position a lens at a given distance above the base so that light from the overhead projector will pass through the transparency and project it on a remote screen without white light showing around the sides of the transparency.

Abstract: An over head projector has a standard projection lens for projecting the whole view of an original image and a partial projection lens for projecting a part of the original image in enlarged scale. One of the projection lenses is selectively brought to a projection position for projecting the original image onto a projection screen. A stage for supporting the original image is vertically movable and is moved up and down when the projection lens is changed. The selection of the projection lens and the vertical movement of the stage are associated with each other so that the original image is always at a proper position with respect to the focal length of the selected projection lens.

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 slide projector located within a rear-screen projector has means therein for projecting images, contained on slides, onto a self-contained projection screen. Two lenses having different focal lengths are mounted within the projector housing and may alternatively be brought into the optical path for projecting slides, having different size formats, such that the projected image fills the projection screen.

Abstract: The inventive microfilm reader and reader-printer has a film gate which is anchored to the chassis of the reader or reader-printer and which is entirely separate from a light system, lens mount, and focusing system which float up and down with respect to the film gate and chassis. The floating system is mounted on an elevator mechanism which lifts or lowers it relative to the film gate to scan across the width of the film. A prism is included in the lens system to rotate and vertically align the projected image. A combination of the movements of the elevator mechanism and prism enables any vertical segment of the microfilm to be scanned, selected, and read in a vertical orientation.

Abstract: A slide projector for use with magazines of the flexible type in which slides are supported for movement around a closed-loop path and are swingable one by one into and out of a slide-projection station about an axis defined by a rotary drive shaft. The magazine has individual clip-type slide-holding elements that slide along an endless path and have frames in which slides are held. A condensing lens is mounted and guided for movement from a normal operating position close to the slide-projection station and in the path of the slides, to a retracted position out of the path, with a combined reciprocating and swinging motion, and is moved back and forth by a rotary crank mechanism that is driven by the slide-feeding mechanism, to shift the lens rapidly out of and back into the operating position during each slide change, with a dwell in the retracted position for the change.

Abstract: The disclosure relates to a microform reader apparatus of the type which projects a magnified image of an image film frame onto the rear side of a viewing screen to facilitate forward viewing of the magnified image. The microform reader of the present invention includes an adjustable mirror assembly positioned between a light source and condensing lens for optimizing the brightness of the displayed image. In a preferred form the mirror assembly is adjustable from the front of the microform reader to allow simultaneous monitoring of the brightness of the display while the adjustment is being made. The microform reader of the present invention also includes an adjustable lens assembly which allows the optical axis of the lens assembly to be adjusted for perpendicularity to the image frame surface.