Abstract: A projector is disclosed. The projector comprises: a body having an upper surfaces; a light output unit provided inside the body and outputting an image toward the upper surface; a cover covering the upper surface and pivotally connected to the body; and a control unit for reversing the image according to the angle formed by the cover and the upper surface.

Abstract: A retroreflective material having high retroreflective performance while being edible is provided with a reflector main body that has optical transparency. The reflector main body is formed from agar. One side of the reflector main body constitutes an incident surface where incident light enters into the reflector main body. The other side of the reflector main body is formed as a retroreflective surface that reflects incident light that has entered to an inner part of the reflector main body in a direction substantially parallel to an incident direction.

Abstract: This overhead projector comprises: a screen (4) equipped with a frame and a translucent panel tautened on this frame, the translucent panel having a front face (20) on which the images are displayed and a rear face (8) on which the images are projected, the screen (4) being capable of being shifted between a retracted position and a stretched position in which the surface area of the panel is increased by at least 10% relatively to the surface area of the panel in its retracted position an apparatus (5) for projecting images on the rear face of the translucent panel this apparatus (5) being capable of adapting the size of the projected images to the retracted position as well as to the stretched position of the screen.

Abstract: A display device (100) of the present invention has a first switch (3) and a second switch (4) on an upper surface of its casing, and includes a control circuit (18) for controlling the first switch (3) and the second switch (4) and a light source (19) inside the casing. The control circuit (18) performs control so that the light source (19) is turned on when the second switch (4) is pressed after a predetermined period of time has passed from when the first switch (3) was pressed. Thereby, the display device (100) of the present invention prevents entering of a person into a projection area before projection of video, and controls inadvertent start-up.

Abstract: An apparatus and method to display an image are provided. The apparatus includes a reflective surface including an image disposed upon at least a portion of the reflective surface, an agitable and semi-transparent medium positioned over at least a portion of the reflective surface, a light source positioned to project light on the reflective surface through the medium, and a second surface positioned to capture light reflected from the reflective surface through the medium for displaying the image. The method of displaying the image includes disposing at least a portion of a reflective surface including an image beneath an agitable and semi-transparent medium, wherein the image is disposed upon at least a portion of the reflective surface, and providing light to the reflective surface such that a second surface captures light reflected from the reflective surface through the medium for displaying the image.

Abstract: A projection optical system including a projection lens, a first mirror that reflects a light from the projection lens, and a second mirror that widens an angle of a light from the first mirror by reflecting the light projects a light modulated according to an image signal from an optical engine unit. A third mirror reflects a light from the projection optical system. A screen transmits a light from the third mirror. An optical axis of the projection lens substantially matches an optical axis of the second mirror, and the light from the optical engine unit is shifted to a specific side from the optical axis of the projection lens.

Abstract: A reflective or light redirecting device has a base with an overlaying pattern or light redirector. The pattern can be selected from a collection of masks, templates, or reflective appliques. The device is arranged to reflect or redirect light, for example sunlight, in a beam that projects a corresponding design. A motor rotates the device and reorients its directional axis to reflect light toward a surface to circulate the design on a path on the surface.

Abstract: This overhead projector comprises: a screen (4) equipped with a frame and a translucent panel tautened on this frame, the translucent panel having a front face (20) on which the images are displayed and a rear face (8) on which the images are projected, the screen (4) being capable of being shifted between a retracted position and a stretched position in which the surface area of the panel is increased by at least 10% relatively to the surface area of the panel in its retracted position an apparatus (5) for projecting images on the rear face of the translucent panel this apparatus (5) being capable of adapting the size of the projected images to the retracted position as well as to the stretched position of the screen.

Abstract: A rear projection display device is provided. In an embodiment, the display device includes a laminate screen including a microstructure lamina having a non-planar input surface, a substantially planar output surface and a first index of refraction. The laminate screen further may include a diffusion screen lamina having a substantially planar input surface, an output surface and a second index of refraction. The diffusion screen lamina may be in optical communication with the microstructure lamina. Moreover, the planar output surface of the microstructure lamina and the planar input surface of the diffusion screen lamina may be in facing relationship.

Abstract: In general, in one aspect, the invention features a system that includes a catoptric projection objective having an optical axis and including a plurality of projection objective elements positioned between an object plane and an image plane, the object and image planes being orthogonal to the optical axis, the projection objective being configured so that during operation the projection objective directs radiation reflected at the object plane to the image plane to form an image at the image plane of an object positioned in a field at the object plane, the field having a first dimension of 8 mm or more and a second dimension of 8 mm or more, the first and second dimensions being along orthogonal directions.

Abstract: A reflective or light redirecting device has a base with an overlaying pattern or light redirector. The pattern can be selected from a collection of masks, templates, or reflective appliques. The device is arranged to reflect or redirect light, for example sunlight, in a beam that projects a corresponding design. A motor rotates the device and reorients its directional axis to reflect light toward a surface to circulate the design on a path on the surface.

Abstract: A Fresnel lens. The Fresnel lens includes an input side configured to receive the image and an output side, opposite the input side, configured to display the image. The input side includes a first facet angled to receive input light constituting at least a portion of the image. The input side also includes a second facet at least partially facing the first facet and a third facet linking the first facet to the second facet, wherein the third facet and the output side are substantially parallel.

Abstract: A Fresnel lens for a display device is provided. The Fresnel lens includes a first sloped surface angled to receive input light, a second sloped surface facing the first sloped surface, and a valley floor linking the first sloped surface to the second sloped surface. The valley floor may be configured to scatter stray light reflected from the first sloped surface.

Abstract: A rear projection display device is provided. In an embodiment, the display device includes a laminate screen including a Fresnel lens lamina having a non-planar input surface, a substantially planar output surface and a first index of refraction. The laminate screen further may include a diffusion screen lamina having a substantially planar input surface, an output surface and a second index of refraction. The diffusion screen lamina may be in optical communication with the Fresnel lens lamina. Moreover, the planar output surface of the Fresnel lens lamina and the planar input surface of the diffusion screen lamina may be in facing relationship.

Abstract: The ultra-thin rear projection display device described herein includes a wide angle lens system and one or more planar mirrors that are parallel to a screen on which an image is to be displayed. In one embodiment, the screen that has multiple groove angles to provide better illumination than screens with a single groove angle.

Abstract: The ultra-thin rear projection display device described herein includes a wide angle lens system and one or more planar mirrors that are parallel to a screen on which an image is to be displayed. In one embodiment, the screen that has multiple groove angles to provide better illumination than screens with a single groove angle.

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: Several different magnification lenses are adjustably mounted in a contour projector housing for movement selectively and one by one into operative registry with an entrance lens that faces a workpiece that is to be inspected. Spaced illuminators in the housing direct light beams onto opposite sides of the workpiece to produce combined profile and surface images thereof that are projected by the entrance lens and the registering magnification lens onto the reflective surface of a first mirror. This mirror projects the combined, magnified images in the housing onto a second mirror, which then projects the combined images onto a projection screen mounted in the housing for observation by the person using the projector.

Abstract: A projection type display apparatus incorporating a light receiver or a light transmitter, in which the light signal is received or transmitted through a screen or condensing lens disposed in its vicinity, and hence the luminous flux utility efficiency is high.A projection type display apparatus capable of preventing deterioration of picture quality due to difference in color in the projection units, and the best picture quality is realized even when the projection lenses for different colors are composed of nearly same components.

Abstract: A reflection prevention film coats a backside of a stage glass by a vacuum evaporation and coating, etc. A light from a metal halide lamp is not reflected on the back of the stage glass by the reflection preventing film, and is transmitted through the stage glass and is reflected on a surface of the stage glass and a transparent manuscript. The light reflected on the surface of the stage glass and the transparent manuscript enters a projection lens unit and appears as a spot light on a screen, but because the light is not reflected on the backside of the stage glass, so that the amount of the light, which causes the spot light, can be reduced. As a result, the spot light on the screen is inconspicuous.

Abstract: An apparatus positions a rotary drum having an axis of rotation in an image scanner having a frame to position an image source mounted on the rotary drum. A way is mounted to the frame. A headstock and a tailstock are disposed and arranged to receive and support the rotary drum and are independently mounted on the way for lineal movement along the axis of the drum. A drum drive device rotates the drum about the axis and a headstock drive device linearly moves the headstock along the axis in first and second opposite directions. A stop block is supported by the frame and impedes a linear movement of the tailstock in the second direction at a selected stop position.

Abstract: An overhead projector that irradiates light onto an object or a sheet of paper, focuses the light reflected therefrom with a focusing lens, isolates ultraviolet or infrared rays having a specific wavelength among the focused light via a filter, forms an image by irradiating the isolated light onto an image former, and projects the image onto a projection screen by irradiating visible light onto the image former whereby the image is enlarged and projected via a projection lens to thereby obtain a more clear image.

Abstract: A reflecting illumination type projecting device includes a projecting lens having an optical axis intersecting an object to be tested, a light source portion for illuminating the object through the projecting lens, a screen onto which an image of the object is projected by light reflected on the object through the projecting lens, and an optical path separating element disposed in the vicinity of an exit pupil, the element being formed with a total reflecting mirror portion for reflecting either the illuminating light or the reflected light and with a transmitting portion for transmitting the remaining light, thereby to make the illuminating light incident to the projecting lens and to guide the reflected light toward the screen.

Abstract: A reflecting illumination type projecting device includes a projecting lens having an optical axis intersecting an object to be tested, a light source portion for illuminating the object through the projecting lens, a screen onto which an image of the object is projected by light reflected on the object through the projecting lens, and an optical path separating element disposed in the vicinity of an exit pupil, the element being formed with a total reflecting mirror portion for reflecting either the illuminating light or the reflected light and with a transmitting portion for transmitting the remaining light, thereby to make the illuminating light incident to the projecting lens and to guide the reflected light toward the screen.

Abstract: A reflective overhead projector is provided with two lamps for the purpose of allowing change from one to the other of the lamps in the event of expiration of the lamp in use. The lamps are arranged to face the center of a circle at which is positioned a rotatable planar mirror which may be turned to direct light from a desired one of the two lamps. An electrical switch senses the position of the mirror and directs electrical power to the appropriate lamp.

Abstract: An apparatus and method for projecting optical images from opaque or transparent objects onto a remote viewing screen includes a plane mirror combination and a reflective projection means. The plane mirror combination comprises an image inverting plane mirror and an image reversing plane mirror. The image inverting plane mirror is positioned angularly over the illuminated object and converts the upright and nonreversed object image into an inverted and reversed image. Disposed close by the image inverting plane mirror is the reflective projection means which comprises a parabolic concave mirror the parabolic concave mirror captures the inverted and reversed image and projects it onto the image reversing plane mirror near by as an enlarged, upright and reversed image. In return, the image reversing plane mirror reflects the enlarged, upright and reversed image onto the remote viewing screen as an enlarged, upright and nonreversed real image.

Abstract: An overhead projector comprises a hollow base comprising a writing plate and a reflective Fresnel lens below the writing plate and an air space below the Fresnel lens. A hollow support arm projecting up from one side of the base carries a projection head having an objective lens and deflection mirror. A lamp mounted in the transition between the support arm and the projection head directs light on the writing plate. The hollow support arm is in communication with the interior of the base to provide a cooling air flow path between openings in the base at the side opposite the support arm and openings in the support arm adjacent the projection head, behind which latter openings a blower is mounted. Ribs in the hollow base define air flow distributors for effectively cooling the Fresnel lens and electronic circuit components mounted in the hollow base.

Abstract: A reflective stage overhead projector has a light source, a projection lens and mirror assembly for focusing and reflecting an illuminated image onto a screen, and a stage area for supporting an image to be illuminated and projected. One reflective surface of the stage area is defined by a noncentral portion of a Fresnel lens.

Abstract: An opaque projector includes a light source, a stage through which the light radiating from the light source passes and on which an object is placed, a projection mirror for reflecting light reflected by the object, and a projector lens for gathering the light reflected by the projection mirror to form an image of the object on an image projecting surface located outside of the projector. A reflection mirror for reflecting the light from the light source to illuminate the object is provided on each of the two sides of the projection mirror. The light source is disposed in front of the projeciton mirror and on the inner sides of the reflection mirrors.

Abstract: A portable overhead projector having a folding arm. The arm and a torque member are pivotally attached to the projector head, forming a four bar linkage. When the arm is moved from an upright, operative position to a storage position, the projector head rotates so as to be flush with the base of the projector, making the projector more compact for storage. An adjustment mechanism is also provided to automatically open and close a mirror which is attached to the projector head, simplifying the set up procedure of the overhead projector.

Abstract: A projecting optical apparatus has a light source which is located above a document supporting plate to illuminate a document located on the document supporting plate. A projecting lens system is located above the document supporting plate to project an image of the document on a projection screen. A reflection mirror reflects the light transmitted through the projecting lens system toward the projection screen to make an image on the projection screen. The projecting lens system and the reflection mirror are incorporated in a projecting reflection unit, so that the projecting reflection unit is movable in directions substantially parallel with the plane of the document supporting plate.

Abstract: A portable foldable overhead projector includes a housing having a front opening communicating with an interior cavity, and a bottom aperture communicating with the cavity and closable by a pair of pivoting doors which, when open, support the housing on support legs and accommodate movement of a mirror inside the housing between stowed and use positions. In the use position the mirror reflects light from a source through a transmitting stage in the top wall of the housing which forms a pivoting door to provide further access to the cavity. A mast pivots along the outside of the housing and carries a foldable projection head assembly on a rack and pinion mechanism. When the mast is lowered the rack and pinion can be operated to move the folded projection head assembly through the front opening into the cavity for storage.

Abstract: A liquid crystal display assembly for use with a reflective type overhead projector includes a liquid crystal display and an attached Fresnel reflector portion which is off-axis in that the center of the reflector is not included in the Fresnel reflector portion so that a spurious bright spot coinciding in the projected image with the center of the Fresnel reflector is eliminated.

Abstract: An optical apparatus having a base table on which an original is placed and an image forming unit with an optical system which projects an image of the original onto a remote screen for showing the same to a number of viewers. A foldable structure is provided, having a support structure mounted on a base table for movement between a lowered position covering the base table and a raised position wherein the image forming unit is located above the base table so as to form and project the image of the original onto the remote screen. A linkage interconnects the image forming unit and the support structure for causing a movement of the image forming unit relative to the support structure upon movement of the support structure between the folded and unfolded positions, thereby placing the image forming unit above the base table when the supporting means is in the raised position and flush with the support means so as to cover the base table when the support means is in the lowered position.

Abstract: An opaque adapter for an overhead projector uses a hood with clamshell doors to provide generous access to the projector stage during transparency projection and efficient light shielding during opaque projection. The clamshell doors are oriented upon hinges slanted to the vertical so as to rise away from the stage when opened. Spring devices offset the gravitational forces on the doors, allowing rapid motor actuation with very little power. Dual dichroic optics maintain a cool stage despite high light intensity, and internal baffles further increase brightness.

Abstract: A variable power reflectory type overhead projector for forming a projected luminous beam by lighting a reflecting mirror from the projecting lens side. A transparent film-to-be-projected support is provided between a regular position of the film to be projected and the projecting lens, and an auxiliary lens is included for focusing the projecting lens on the support.

Abstract: An image projector is provided with increased light magnification through lenses positioned between the light source and the platen section of the projector. In addition to increased light magnification, increased image magnification is provided between the platen section and the mirror. Cooling air is directed separately over the light source and exhausted separately to dissipate additional heat generated with the increased magnification of light upstream and downstream from the platen section. The increased magnification and cooling air allows the clear projection of delicate items, such as photographs, which are otherwise not projectable by prior projectors.

Abstract: A reflection-type overhead projector for projecting large transparencies onto a remote screen. The overhead projector has a base with a Fresnel mirror that serves as a stage on which a transparency to be projected is placed, and a lamp housing for a projection lens with an associated mirror which is supported on a pivotable arm above the base. The lamp housing is formed with an opening for allowing the passage of light to illuminate the transparency on the stage. This opening is fitted with a protective screen for guarding the fingers from the heated illumination lamp.

Abstract: An overhead projector having a stationary main body including a Fresnel plate, a projection unit, and a swingable member for supporting the projection unit and swingably secured to the main body. The overhead projector comprises one way clutch means through which the swingable member is secured to the main body and which is adapted to limit the swinging motion of the swingable member towards the main body.

Abstract: An improved portable opaque projector with superior performance and portability is characterized by a transportable mode and an operable mode. When in its operable mode the top is removed and a removable mirror is mounted to the projection lens, and the projector sides are extended. Improved means for mounting a mirror proximate the extendable projection lens and in fixed vertical relationship thereto as the lens is rotatably extended for focusing, is provided. An improved mirror structure for preventing non-planar distortion of the mirror surface is also provided.

Abstract: A Fresnel lens is mounted on a base in the form of a thin rectangular plate to be placed on a flat table. A document to be projected is put on the Fresnel lens. A main projector body housing a power supply is pivotally mounted on one end of the base. A head having a light source and a mirror is angularly movably coupled to a post arm which is angularly movably or telescopically coupled to the main projector body. When not in use, the base, the main projector body, the head, and the post arm are collapsed and combined into a single block body for easy transportation and storage.

Abstract: A thermal management system particularly adapted for a portable lightweight opaque projector dissipates the heat generated within the projector by the projector light source in a controlled fashion, while maintaining the exterior of the projector in a moderate temperature range. Opposed sidewalls of the enclosed interior illumination chamber of the projector are provided with alongated planar heat sink surfaces which are coated with a flat black finish which is highly absorptive of infrared as well as visible radiation. The heat sink surfaces are mounted spaced from the adjacent interior sidewall of the projector, such that an air channel or plenum is formed between the heat sinks and the adjacent sidewall. Exhaust fans draw air out from the interior of the projector and through these air channels to thereby remove heat absorbed by the heat sinks. The exterior sidewalls of the projector opposite the heat sinks are provided with a passive heat dissipation mechanism.

Abstract: A reflection type overhead projector employs a Fresnel concave mirror adapted for allowing a transparency to be put on the mirror surface thereof. The beam of light emitted from a light source lamp is reflected by the Fresnel concave mirror, enters a projecting lens and then is projected on a screen. A reflecting mirror is interposed in an optical path between the Fresnel concave mirror and the projecting lens to thereby bend the optical path. The Fresnel concave mirror, the light source lamp and the projecting lens are all mounted to a single case.

Abstract: A portable overhead projector wherein characters, a picture and the like drawn on a transparent sheet rested on a horizontally supported stage can be projected onto a screen or the like, and having a safety device in which a projection unit can avoid impinging upon a mirror-Fresnel plate, thereby preventing damage to it. This safety device features a lock mechanism for preventing projection unit supports from rotating unless the projection unit is folded toward the supports. Furthermore, the overhead projector has a rotatable support for one side of the mirror-Fresnel plate whereby the mirror-Fresnel plate is held horizontally during projection, and is inclined during housing, whereby the projection unit is housed in a space formed by the inclining of the mirror-Fresnel plate.

Abstract: An overhead projector comprises a base, a hollow post extending up from the base and a projection head on an upper portion of the post. The projection head comprises a light source, an objective lens and a deflection mirror. A power supply unit housed in the post supplies power to the light source and to a ventilating fan inside the post between the power supply unit and the projection head. Openings in the post provide for circulation of cooling air by the fan over both the light source and the power supply unit. The power supply unit includes interchangeable input stages which can be plugged into a socket in the post to adapt the power supply unit to different voltages and currents. A slide or microfilm projector mounted adjacent the projection head projects on the base an image which is then re-projected onto a wall or screen by the projection head. For use at conferences, a conference table top is provided with a plurality of sockets into which the posts of overhead projectors can be plugged.

Abstract: A portable opaque projector is characterized by a transportable mode and an operable mode. When in its transportable mode, the projector has the configuration of a compact hexahedron; when in its operable mode the top and sides of the projector are opened up, and a mirror is mounted to the top.

Abstract: In a reflecting type overhead projector having a light source lamp and a projection lens above a reflecting table formed of a Fresnel lens and a mirror upon which an original to be projected is laid, there is provided a control circuit which switches over supply of electric power to the light source lamp between full and part power supply according to whether the intensity of the light beams from the light source lamp received by a photosensitive element provided in the vicinity of the reflecting table is higher or lower than a predetermined value.

Abstract: An episcopic projector in which a field flattening lens located beneath the copy plane is used to direct light incident the copy and reflected from the copy through a Fresnel lens of relatively long focal length. An intermediate mirror is used for left right correction and the Fresnel lens is mounted so that it may be focused by simply moving it along the optical axis of the system.

Abstract: An apparatus and method for constructing a completed image from an incomplete selected sample and for the projection of the image onto a surface upon which an article has been affixed so as to permit the viewing of the article as if the same were positioned in conjunction with the completed image. More specifically, the completed image may be formed from an incomplete framing sample.

Abstract: A portable opaque projector is characterized by a transportable mode and an operable mode. When in its transportable mode, the projector has the configuration of a compact hexahedron; when in its operable mode the top and sides of the projector are opened up, and a mirror is mounted to the top.