Abstract: An image reading apparatus includes a housing unit including a support table on which an original document is supported, a reading member disposed inside the housing unit to read the original document, a power source unit disposed adjacent to the housing unit while being separated by at least one wall, the power source unit accommodating a power circuit, and a sending member that sends air inside the power source unit into the housing unit through an opening formed in the wall.

Abstract: An LED projection night light for night time or dark area use includes a plug-in wall outlet night light or direct current operated night light with projection features to project an image, message, data, logo, or time on a ceiling, walls, floor, or other desired surface. The LED night light incorporates optics means such as an optics-lens, slides, openings, or cut-outs, and/or a transparent material piece, translucent material piece, telescope assembly, housing-member, slide-film, slide-disc, elastic-member, tilt-means, rotating-means, adjust-means, roller-means, mechanical-means, extend-means, convex lens, and/or concave lens designed to make the desired image, message, data, logo, or time project to the ceiling, walls, floor, or other desired surface to be seen by a viewer. The LED light has an interchangeable power source arrangement, permitting the night light to be selectively powered by either an AC powered sealed-unit or a DC powered battery-pack.

Abstract: A scan assisting fixing device and a scanner using the same are provided. The fixing device is for fixing an object to be scanned, which includes a scanning portion and a holding portion. The fixing device includes an accommodation region, a scan window and a protrusion portion. When the holding portion is loaded in the accommodation region, the scanning portion correspondingly disposed in the scan window is retained and fixed by the protrusion portion, and the position of the holding portion in the fixing device is constant, so that the scanning portion is always within the range of the field depth of the scanner regardless of the specification of the positive film holder, and the clarity of the scanned image is assured.

Abstract: A projection assembly is arranged to be added onto or built into at least one LED-unit or other light-unit of an illuminated object that has more than one LED or other light source to cause the object to be illuminated and show the object's design or appearance while also offering illumination to people. The illuminated object may include all kinds of seasonal lighting, regular light fixtures, track lights, desktop lights, and battery operated lights having more than one light-unit or LED-unit.

Abstract: Embodiments of the present invention include systems and methods for reducing driver boredom for the driver of a vehicle particularly for vehicle environments such as straight roads and lack of traffic that are likely to induce boredom. An example system includes an electronic circuit such as a computer, a vehicle environment monitor, a driver interface, and a driver stimulation device such as a semitransparent display.

Abstract: A system and method for determining whether one or more slides are loaded properly within a cassette. Each slide includes one or more transparent regions and one or more non-transparent regions. The slides are between a light source and a sensor. The light source generates light that is directed towards the sensor through the slides. If the sensor is able to detect light from the light source, then the slides are properly loaded in the cassette. Slides are not properly loaded if the light is blocked by a non-transparent region before reaching the sensor. The sensor or a separate controller can generate a signal or data to provide an indication to a user or to processing equipment that the slides are or are not properly loaded. For example, a speaker or an indicator light can be used to provide an indication to the user. The signal or data can also be used for other functions, such as displaying a message on a screen indicating whether the slides are properly loaded.

Abstract: A visual presenter includes a base, an upright portion standing from the base and having a distal end, a support column including a horizontal portion formed by bending the distal end of the upright portion so that the horizontal portion protrudes forward away from the base, the horizontal portion having a distal end, an imaging camera head mounted on the distal end of the horizontal portion, and a pivot portion provided on the upright portion of the support column so that the horizontal portion is pivotable horizontally.

Abstract: The invention relates to an improved slide projector with multiple projection sections, which includes at least two lighting sources controlled by an IC therein. The projector has a head with multiple projection sections on its lens and a slot for receiving a slide, which is provided with multiple drawings relating to a lighting source. The slide projector can provide an action projection shows when the lighting sources are lightened in series that obtains a utilized effect.

Abstract: A system and method for determining whether one or more slides are loaded properly within a cassette. Each slide includes one or more transparent regions and one or more non-transparent regions. The slides are between a light source and a sensor. The light source generates light that is directed towards the sensor through the slides. If the sensor is able to detect light from the light source, then the slides are properly loaded in the cassette. Slides are not properly loaded if the light is blocked by a non-transparent region before reaching the sensor. The sensor or a separate controller can generate a signal or data to provide an indication to a user or to processing equipment that the slides are or are not properly loaded. For example, a speaker or an indicator light can be used to provide an indication to the user. The signal or data can also be used for other functions, such as displaying a message on a screen indicating whether the slides are properly loaded.

Abstract: System and method for calibrating the orientation or arrangement of slides in a storage receptacle. A reflective marking is asymmetrically applied to a side or edge of a slide, forming reflective and non-reflective sections. Light is directed to the slide, and a sensor detects light that is reflected by the reflective sections and generates signal or data representing an orientation of the slide. A controller processes the signal or data to determine whether the slide is properly oriented on a tray in the storage receptacle, e.g., whether the slide is flat or at an angle, upside down, rotated. The marking can be reflective ink, paint or an adhesive. Reflective and non-reflective markings can also be formed by laser etching, polishing, or by frosting.

Abstract: A slide projector that is portable, easy to use and suitable for use by an individual, or individuals in the home. The slide projector comprises means in which to project an image perpendicularly from a slide onto a projection surface. In use, the projected image of the slide lies in a substantially planar surface. The slide is located in a rotating carousel which can be automatically, or manually, rotated, thus providing accurate simulation of the orientation of stars and other celestial bodies at a specific date and time.

Abstract: A slide feeder, a slide system and a slide feeding method are disclosed. Conventional slide feeders are incapable of feeding the same slide mounts repeatedly to an external appliance with no help by a human hand, accordingly are unsuited to a scanning work at a high speed and incapable of separating slides stably at a feeding time. To overcome these problems, the present invention comprises feeding slide mounts stocked in a first slide stock section to an external appliance and stocking slide mounts discharged from the external appliance into a second slide stock section in a first operation mode, and feeding and stocking the slide mounts reversely in a second operation mode. Furthermore, the slide mounts are carried in a feeding direction with a rotating force of a roller. Moreover, the slide mounts are separated with a separating pad at a feeding time.

Abstract: A projector capable of throwing image on a screen from objects, the project comprising a base including a plurality of mirrors, a rear slanted plate hinged to the base, a lens in the front board, an object receiving drawer, and a cover; an angle adjustment means on the outside of the rear slanted plate; a light source; a housing shaped; and a cooling means. Image of object is reflected on mirror and lens. A clear image is obtained by turning the focusing knob. Further bias the rear slanted plate for adjusting the angle of thereof so as to obtain a better angle of the lens for enhancing focus.

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 slide mount has a first portion and a second portion. The first portion includes an interior region, an edge, and a slot extending from the interior region to the edge. A cavity is formed between the first portion and the second portion, and extends to the first edge. A film segment is disposed in the cavity. The slide mount disengageably locks in the film segment. The film segment can be released from the slide mount using an extractor arm. The slide mount can have a locking aperture for receiving a locking piston to disengage a protruding element from the film segment so as to permit extraction of the film segment from the cavity of the slide mount.

Abstract: A transporting system for an image digitizer can handle both positive and negative transparent film material. The transport features accurate linear motion with high resolution in a single compact unit. For the processing of individually framed slides, an automatic eject mechanism is provided. Both manual and motor driven focus adjustments are provided. Individual images can be oriented by an angular adjustment option. A special carrier allows the system to process negatives in uncut strips. The transport can manage larger number of images using either a slide tray or roll feed attachment.

Abstract: A slide feeder, a slide system and a slide feeding method are disclosed. Conventional slide feeders are incapable of feeding the same slide mounts repeatedly to an external appliance with no help by a human hand, accordingly are unsuited to a scanning work at a high speed and incapable of separating slides stably at a feeding time. To overcome these problems, the present invention comprises feeding slide mounts stocked in a first slide stock section to an external appliance and stocking slide mounts discharged from the external appliance into a second slide stock section in a first operation mode, and feeding and stocking the slide mounts reversely in a second operation mode. Furthermore, the slide mounts are carried in a feeding direction with a rotating force of a roller. Moreover, the slide mounts are separated with a separating pad at a feeding time.

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 system operates to handle and print images from a film slide having a first slide mount and a film segment mounted therein. The system includes a film segment extractor, a scanner, a printer, and a film segment mounter. The extractor extracts the film segment from the first slide mount of the film slide. The scanner scans image data from the film segment. Digital scanning may be performed by a digitizer. The printer prints an image from the scanned image data either optically or digitally. The film segment mounter mounts the film segment into a second slide mount as a second film slide. The second slide mount may be a new slide mount, or may be the original slide mount which is being reused. Magnetically encoded information stored on magnetic material disposed on the first slide mount and/or the film slide is read by respective magnetic readers. The information is then written on magnetic material disposed on the film segment and/or the second slide mount after printing from the film segment.

Abstract: A transporting system for an image digitizer can handle both positive and negative transparent film material. The transport features accurate linear motion with high resolution in a single compact unit. For the processing of individually framed slides, an automatic eject mechanism is provided. Both manual and motor driven focus adjustments are provided. Individual images can be oriented by an angular adjustment option. A special carrier allows the system to process negatives in uncut strips. The transport can manage larger number of images using either a slide tray or roll feed attachment.

Abstract: An automated film slide orienting and mounting system includes at least one detector for detecting the orientation of film, a knife assembly for successively cutting the film to generate film segments, a rotatable table for orienting the film segments into a proper orientation, a set of driver assemblies for progressively moving each film segment for insertion into a slide mount, and a magnetic writing device for writing the orientation of the film segment magnetically onto the slide mount in a region of magnetic material disposed upon each slide mount.

Abstract: An image scanning device is provided with simplified operation. A document holder has reference marks and/or a positioning frame so a document, such as a film or film slide, can be repeatably placed in an accurate position on the document holder. The document can be pressed between two flat plates of transparent material on the document holder to keep the document flat. The image scanning device has a door that need not be manually opened or closed. The document holder is inserted into the image scanning device through the door and is accurately mounted to a movable stage. The stage contacts the document holder so the document holder is positioned on the stage in the same position every time the document holder is mounted to the stage. The stage can also be positioned such that the stage is fixed to a case containing the image scanning device. By fixing the stage to the case, damage to the stage and other support devices is avoided during shipping or transport.

Abstract: A housing is mountable on a carousel slide projector. The housing contains a movable light valve slide assembly that is coupled to a video signal source. The light valve slide assembly is movable between a position within the housing and a position outside the housing. When mounted on the slide projector, the light valve slide assembly can be moved into the projection chamber of the slide projector. The video signal source transmits a video signal to the light valve slide assembly, where the video signal is converted to a drive signal to actuate pixels on the light valve. The light valve thus generates a video image that is projected onto a viewing surface. Preferably the light valve is an active matrix liquid crystal display.

Abstract: A projector of a reflection type has a transparent stage plate on which a transparent original sheet is set. A lamp illuminates the original sheet through the stage plate. A Fresnel mirror is laid on an upside of the original sheet, and reflects light from the original sheet in a convergent manner. The light from the Fresnel mirror is reflected away from the stage plate. The light is again reflected, and incident upon a projecting lens, which projects an image of the original sheet to a screen. A housing contains the Fresnel mirror in movable fashion. An inserting slot is formed in the housing, into which the original sheet is inserted during supply of the original sheet. Photo sensors operate to detect a front edge of the original sheet inserted through the inserting slot. It is also detected that the original sheet is set on the stage plate. An ejector switch is operated for ejection of the original sheet.

Abstract: An image input system includes an image input device for reading image information from a source document and a feeder for automatically inserting the source documents into the image input device. The feeder includes a loading magazine storing source documents and an adjacent discharge magazine storing source documents discharged from the image input device. The source documents travel along a transport surface within the feeder. A dividing board controls the position of the source documents within the feeder. Detectors are provided to monitor the loading operation. A method of reading image information using the image input system is also disclosed.

Abstract: Apparatus for automatically inserting 35 mm photographic slides into a slide scanning gate in the scanning station of a film scanner, scanning the slide, and ejecting the slides on completion of scanning. A vertical mount in the film scanner housing receives a rotatable slide tray having customer orders in selected tray slots to present each selected slide into alignment laterally in a horizontal plane with the film scanning gate. A load arm is actuated to load the slide from the tray slot into the scanning gate. The scanning gate accepts slides in mounts of varying size and thickness and centers the slide film image frame in alignment with a film scanning plane in the scanning station. The scanning gate is translated in the scanning station out of the load position for low and high resolution scans and returned to the load position.

Abstract: An original feeding device for feeding OHP originals to the display stage of an overhead projector is capable of transportation control suitable for OHP projection. The originals are transported by a conveying film onto the display stage. In order to stop the original at the center of the display stage, after the original is detected by the registration sensor, the conveying film is advanced by an amount equal to the sum of the distance from the registration sensor to the display stage, a half of the length of the display stage and a half of the length of the original.

Abstract: A slide projector having a chute (37) for feeding slides (21, 24) to be projected to a projection gate and also having a stack loader (9) with a first and a second storage chamber (17 and 19), each to take a stack of slides which are in contact with one another. The stack loader (9) has a movable receiving member (31) with two slide compartments (35 and 36), wherein the receiving member serves as a movable intermediate tray whose slide compartments can be selectively aligned with the opening of the chute (37) and can be selectively loaded and unloaded again with an end slide (21, 24) of the stack of slides in one of the storage chambers (17 or 19) by a series of friction wheels (47, 49, 61, 63).

Abstract: A manually-operated tray assembly for facilitating the handling of transparencies on an overhead projector. The tray assembly comprises a dispensing tray for holding a stack of transparencies prior to projection, and a receiving tray for accepting the transparencies following projection. The transparencies are slid one-at-a-time from the dispensing tray to the platen of the projector, and following projection, from the platen to the receiving tray by a stroke of the user's hand. The `used` transparencies accumulate in the receiving tray in a neat orderly stack. The dispensing tray is preferably arranged at a sloping angle relative to the platen of the projector so that only one transparency at a time is transferred to the platen. The receiving tray is also preferably arranged at a sloping angle relative to the platen to facilitate the transfer of transparencies from the platen to the receiving tray.

Abstract: Apparatus for automatically digitizing slides, the apparatus including a slide feed assembly (2), at least one digitizing and input station (D), and a reception assembly (2') for receiving slides that have been digitized in this way. Each slide feed and reception assembly (2, 2') includes at least one drawer (6) containing a removable magazine (11) which may be rotationally driven about a vertical axis and including at least one removable slide storage element (12). Transfer systems (14, 21) serve firstly to feed slides from a storage element (12) of the removable magazine (11) to a central turntable (15) which places the slides successively before various workstations including the digitizing and input station (D), and secondly transfer slides after digitizing from the central turntable (15) to a storage element (12) of a removable magazine (11) placed in said reception assembly (2'). The slide feed assembly (2) and the slide reception assembly (2') may be the same assembly.

Abstract: An improved overhead projector which allows for automated feeding of transparencies from input and output trays positioned within a body of the projector. The feed mechanism is reversible to allow previously viewed transparencies to be repositioned over a light source on a table of the projector and seen on a display screen. The transparency trays include retractable mechanisms allowing them to be switched from receiving or delivering transparencies into a feed path. An optical projection head includes an adjustable mechanism to automatically reorient a projected image for transparencies in landscape or portrait views. The adjustable mechanism includes a first mirror which is adjustable to reflect light transmitted from the light source directly from the transparency toward the display screen, or to present a thin vertical profile allowing a light image to reflect off second and third mirrors before reflecting again off the first mirror and toward the display screen.

Abstract: The system comprises a hopper attached below a table for holding two stacks of the slide mounts. A pick-off station removes the slide mounts from the slide mount stack. The slide mount is moved to a slide mounting station and then sealed underneath a ultrasonic welding head. The hopper includes a carousel that rotates either stack into a predetermined position underneath the pick-off station. The motorized hopper used in conjunction with the pick-off mechanism and hold-down apparatus eliminate the previous problems associated with slide mount jamming. The ultrasonic welding head vibrates the top half of the slide mount creating a friction between the internal faces of the top and bottom halves of the slide mount. This friction heats adhesive inside the slide mount sealing the top and bottom halves of the slide mount together.

Abstract: An original conveying apparatus includes an original stacker, a separator for separating the stacked originals from an upper side and for supplying the separated originals, a conveyor for conveying the separated originals to pass them through a reading portion and holding the originals in page sequence, a driver for rotating the conveyor normally or reversely, a discharger for returning the original to the original stacker and a controller for controlling the driver, the discharger and the separator so that an original is selected and set on the reading portion.

Abstract: A projection original film feeding apparatus is provided with a feeder for feeding original film to a projecting position, a sizer for outputting size information of the original film, and a controller for varying the amount of feed the original film by the feeder to conform with the size information from the sizer and setting the original film at a regular projecting position for each size irrespective of the size.

Abstract: A system for the display of transparencies including a first transparency receiving tray, a second transparency receiving tray, and a staging system connected at one end to the first transparency receiving tray and at the other end to the second transparency receiving tray. This staging system includes a transfer belt extending across a staging area so as to move a transparency across the staging area, a motor drivingly connected to the transfer belt so as to selectively rotate the transfer belt in various directions, and an actuating guide positioned adjacent to the first transparency receiving tray so as to direct the transparency from the first tray to the transfer belt. A controller is connected to the motor so as to actuate the motor for moving a transparency across the staging area in a desired direction. A lift plate is mounted in the receiving trays so as to support a plurality of transparencies thereon.

Abstract: A remote-controlled slide projector is proposed in which for interrupting a slide presentation the projection lamp and the blower can be de-energized by a standby command of the remote control device. To continue the slide presentation, blower and projection lamp can be re-energized by another command via the remote control device. In the standby mode, the electronic control circuit of the projector is continued to be supplied with power.

Abstract: A display panel is formed using a single crystal thin-film transistors that are transferred to substrates for display fabrication. Pixel arrays form light valves or switches that can be fabricated with color filter elements over the pixel elements. The resulting circuit panel is then incorporated into a color projection display system with a light emitting or liquid crystal material to provide the desired light valve.

Abstract: A device for loading photographic transparencies into a magazine having transparency slots, said device comprising a chamber adapted to contain at least some of the transparencies, a feeder means for transferring one of the transparencies from the chamber to one of the slots in the magazine via a feeder gap and a slot positioning means for positioning the slot in alignment with the feeder gap.

Abstract: A housing is mountable on a carousel slide projector. The housing contains a movable light valve slide assembly that is coupled to a video signal source. The light valve slide assembly is movable between a position within the housing and a position outside the housing. When mounted on the slide projector, the light valve slide assembly can be moved into the projection chamber of the slide projector. The video signal source transmits a video signal to the light valve slide assembly, where the video signal is converted to a drive signal to actuate pixels on the light valve. The light valve thus generates a video image that is projected onto a viewing surface. Preferably the light valve is an active matrix liquid crystal display.

Abstract: A notch is formed in a lateral edge of a contact printing plate. An arresting lever is pivotally mounted in a plate guide path for guiding the contract printing plate into a printing position. The arresting lever is urged to protrude into the plate guide path, such that when the contact printing plate is inserted in a normal state into the plate guide member, the arresting lever is not engaged in the notch of the contact printing plate, but if the contact printing plate is inserted in the reversed state, the arresting lever engages in the notch and thus prevents the contact printing plate from moving further into the plate guide member. The contact printing plate has a pushing surface for pushing the arresting lever aside from the plate guide path.

Abstract: An overhead projector for projecting images contained on media. The projector includes a housing having first and second image media storage cassettes and a platen which moves between those cassettes. A lifter is mounted between the cassettes for lifting the media from the first or second cassette onto the platen for projection. The lifter includes a lifting drive and a media gripping device. An image projector is movably mounted to the housing and positionable over the first or second cassette to project an image from media positioned on the platen to a view area. The projector includes a movable arm containing an illumination source, mirror and lens. Image media contained in a cassette can be sequenced from that cassette to the other by lifting onto the platen, from the cassette, projected and deposited in the other cassette either manually, remotely, automatically, or semiautomatically.

Abstract: In a device for moving a slide from a slide tray via a slide chute (3) into a slide gate, an integral component (1) is provided which includes the slide chute (3), a support means for a motor-driven cam (15) and support means for a slide lifter (22), slide pressure means (24, 26) and a tray release lever (16) adapted to arrest a slide tray as well as supporting guide means (6, 6a) for the tray release lever (16) and guides (8d, 8e) adapted to receive the lens mount.

Abstract: A slide projector which is adapted for the use of circular trays (10, 12) having different numbers of slide compartments and which includes a pulse-controlled electronic switch unit for controlling a transport motor selectively moving one of the trays (10, 12) forwardly or backwardly comprises a slider (30) for fixing the trays (10, 12) in position, which slider can be actuated by the electronic switch unit following each indexing of the tray and which can be brought into engagement with both transport pins (15) associated with the compartments of the first circular tray (10) and serving as transport and fixing means and with a toothing (17) associated with the compartments of the second circular tray (12) and serving as transport and fixing means, following each indexing of the tray such engagement being achieved by fixing means (34, 35) associated with the transport and fixing means (15, 17) of the trays and adapted to the shape and size thereof.

Abstract: A film slide feeder serially translates each slide from a feed hopper through a slide tray extending through imaging equipment to a receive hopper for duplicating, digitizing or superimposing the image presented by each slide to the imaging equipment.

Abstract: A projector slide has eight possible orientations, only one of which is the correct one to project a properly oriented image. For an automatic orientator to work there must be a simple way to recognize any one of the eight orientations and decide how to place the slide in the correct orientation. A method and device is described here which accomplishes this task.

Abstract: A system for facilitating the handling of overhead projector transparencies on an overhead projector of the type including an upwardly facing projector platen. The system includes a frame assembly to provide a support surface adjacent the projector platen. A transparency storage cassette is supported on the support surface in alignment with the projector platen and generally includes a housing defining a closed chamber. An upwardly biased follower plate is mounted within the chamber to support a stack of transparencies. A door allows loading of the transparencies into the chamber. Between the door and the follower plate is a cam arrangement to move the follower plate downwardly against the bias when the door is moved to an open position to thereby facilitate the loading of the transparencies into the chamber.

Abstract: A transparency changer attachment for an overhead projector includes hinged horizontal and vertical portions that are located over the projector cover glass and down the projector side, respectively. Transparencies are automatically sequentially fed by pick and retard rollers from a single cassette-loaded transparency stack in the vertical portion to belts and rollers located marginally of a viewing area defined in the horizontal portion, to bring them into registration with the cover glass for projection, and then return them to the single stack. A microprocessor circuit controls the stack side from which the next transparency is picked and to which it is returned, according to selection made by the user. The cassette is keyed to assure correct transparency orientation at loading. A sensor reads individual transparency identifying information to initiate rapid cycling to a particular next desired transparency.

Abstract: A module interposed between a slide tray and a projector provides a user selected random presentation of sequentially ordered slides. The module bottom simulates the tray bottom to align gates of the module and projector. The module top simulates the tray bottom to align gates of the tray and module. A microcontroller controls a lifter foot to keep unwanted slides from dropping into the module gate until the tray had been rotated by a hub assembly to the next desired slide position. The lifter foot then acts to lower a slide through the module to the lifter foot and projector, and return it after projection.

Abstract: A device of the invention is associated with a projector including a horizontal platform on which document sheets are placed one after the other in order to project images thereof on a screen. The device includes two removable cassettes each fitted with levers carried by respective shafts actuated by respective electromagnets. Above the leading edge of each cassette there are two transverse shafts carrying return pulleys over which belts pass for driving the top document from a stack of documents in the cassette. The device includes a horizontal plate which is positioned in alignment with the platform of the projector. An application lies in projecting images during a lecture.

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.