Abstract: The invention relates to an advertising system, comprising an advertising medium with a support, and at least one film, characterized in that the support has at least one holder for holding a flat film. The film can be introduced into the holder and can be replaced, and the holder has multiple holding elements which alone or together with the support form one or more grooves that are suited and designed to hold the film in the formed groove and guide same so as to form a cylindrical or semicylindrical structure.

Abstract: A projector includes an anamorphic prism optical system for converting an aspect ratio of an irradiation region on which the video light is irradiated. The anamorphic prism optical system includes a first prism set and a second prism set. The first prism set is obtained by combining a first prism and a second prism, and the second prism set is obtained by combining a third prism and a fourth prism. The first prism, the second prism, the third prism, and the fourth prism are respectively rotatable around rotation axes thereof, and a space between the first and second prism sets is adjustable in association with the rotation of the first prism, the second prism, the third prism, and the fourth prism.

Abstract: Devices and techniques are described for automatically calibrating a projector system. The projector system undergoing calibration is coupled to a computing device and an automated positioning platform coupled to a target structure. The computing device acquires images using a calibrated camera of one or more patterns projected by the projector onto the target structure when the target structure is in a plurality of repeatable poses. From these acquired images, intrinsic projector parameters may be determined. Once determined, the parameters may be used to correct images produced by the projector or acquired by the camera which include a projected pattern or portion thereof.

Abstract: There is provided a projector that uses a laser light source and is safe and realizes high brightness. The projector applies a laser beam emitted from a laser light source (101) to an image modulation device (105) and magnifies and projects an image formed in the image modulation device (105) by a zoom lens (106). The projector includes a control mechanism (108) for controlling the amount of energy of the light beam in response to a change in a focal distance of the zoom lens (106) in such a way that an energy density of the laser beam developed on a light emitting surface of the zoom lens (106) is kept at a specified value or smaller than the specified value. The specified value is the energy density of the laser beam in a case where the focal distance of the zoom lens (106) is set to the shortest value and is an accessible emission limit value (AEL value) that satisfies the laser safety class of the projector.

Abstract: An image processing device includes: a transformation ratio calculation unit which calculates transformation ratio of an image after transformation, the image after transformation being obtained by transforming an original image under predetermined rule; a filter coefficient calculation unit which calculates filter coefficients based on the transformation ratio; and a pixel value calculation unit which calculates the pixel value of each pixel in the image after transformation using the filter coefficients and outputs the pixel value of the image after transformation as image data after transformation.

Abstract: A auto-focusing method for projection of a computing device with imaging function is illustrated. The computing device exemplarily includes a projection unit, an image receiving unit, and a processing unit. The method firstly controls the projection unit to project images on plural positions along an optical axis. The method then controls the image receiving unit to receive the images, which are regarded as candidate images, projected on the positions by the projection unit. The candidate images correspond to the projective positions. The method further receives the candidate images captured by the image receiving unit, and compute their definitions. Therefore, the image with a greatest definition may be acquired and regarded as a focus image. The focus image's corresponding position is a focus position. After acquiring the focus position, an image may be projected thereon. The illustrated computing device is enabled to complete the image focusing automatically.

Abstract: An image formed on a reflecting optical modulator is magnified by a projection optical system and projected on a backside of a transmission-type screen. The projection optical system is constituted so that a product of an F-number and a projection magnification of the projection optical system is less than 400.

Abstract: An image display apparatus includes plural image forming devices and an observation optical system that includes at least a first optical system configured to fold in a first section a luminous flux from a first image forming device by using a plurality of reflective surfaces and to guide the luminous flux from the first image forming device to the exit pupil, and a second optical system configured to fold in a second section a luminous flux from a second image forming device by using a plurality of reflective surfaces and to guide the luminous flux from the second image forming device to the exit pupil, wherein the first section intersects the second section on an axis that directs from one point in the exit pupil to one point in the observation field.

Abstract: Laser projection device comprising an image generating unit, intermediate imaging optics configured to generate an intermediate image at an image focal plane (210), an image diffusing element (300) and a projection lens (400) with an object focal plane (410), wherein the image diffusing element (300) is arranged in the image focal plane (210) and in the object focal plane (410) and comprises a superimposed microstructure (310) formed of constituent parts (311), which are regularly distributed within a surface plane (320) of the image diffusing element (300).

Abstract: In order to provide a display apparatus with high image quality which can detect a change in light on an entire display frame without any influence on user's appreciation, a rear-projection type display apparatus which projects irradiating light from a light source unit onto a fresnel screen through a light valve includes a light measurement unit which is placed at a position where reflected light from the fresnel screen is condensed, and a control unit which controls the light valve on the basis of the measurement result obtained by the light measurement unit.

Abstract: Focus adjustment for a projector which includes a projection lens having an adjustable focus position. An asymmetrically focused pattern is projected through the projection lens onto a projection screen, wherein the asymmetrically focused pattern is imaged by the projection lens onto the projection screen with a focus at one portion on the screen that differs with focus at another portion thereof. An image of the asymmetrically focused pattern is captured from the projection screen. A focus adjustment direction is calculated by using asymmetrical aspects of the captured image of the asymmetrically focused pattern. The focus position of the projection lens is driven in the calculated focus adjustment direction so as to move from an out-of-focus state of the projection lens toward an in-focus state.

Abstract: A display apparatus, comprises a filter unit 33 attached on an air inlet opening 28a, having such a filter 36 that a suction negative load generating at the air inlet opening 28a formed in an upper cabinet 3 comes to be smaller than the suction load generating at gaps 29a and 30a defined in the upper cabinet 3, when driving a cooling unit 18, for sucking an air from the upper cabinet 3 and discharging the air used for cooling into the upper cabinet 3, when cooling down optical parts, such as, display devices 15R, etc., and a polarizing plate 16R, etc., of an optic unit 9.

Abstract: A projection system that includes a singe light modulation device and a plurality of light sources of different wavelengths. Each wavelength of light is incident on the light modulation device at a spatially distinct location and a temporally distinct time. The use of a scanning mirror allows the projection system to sequentially form, in full-color, each of the columns or rows of an image. The projection system is characterized by the reduction of color separation or the rainbow effect due to the rendering of each column or row in full color.

Abstract: An image projecting apparatus has an integrator for generating plural secondary-light-source images for generating illumination light with a uniform intensity; and a variable stop mechanism arranged at or near a position conjugate with the secondary-light-source images. The variable stop mechanism has a base plate having a fixed aperture; and a stop blade which moves across the aperture for changing a quantity of light. The change in the quantity of light passing through said variable stop caused by the movement of said stop blade is greater than a change in a size of an effective region of a stop aperture.

Abstract: A media transfer device includes an inlet opening, an outlet opening, a screen, and a two-way mirror, such that, when an image is projected through the inlet opening and is reflected off of the two-way mirror onto the screen, a recorder located at the outlet opening may record the screen image as seen through the two-way mirror.

Abstract: A projection system includes a cabinet having a surface with an aperture therein, a projector disposed within the cabinet, adapted to project light through the aperture in the surface of the cabinet, and a lens disposed in the aperture to project the light onto a screen disposed generally non-parallel to the cabinet surface having the aperture.

Abstract: A compact rear projection image display apparatus in which the projection distance in a projection optical system is substantially reduced and no reflection mirror is used, thereby eliminating a major cause of image trapezoidal distortion. The rear projection image display apparatus has a projection lens system which includes a first lens group with positive refractive power and a second lens group which further enlarges an image enlarged by the first lens group. The projection lens system enlarges and projects an image displayed on an image display device, on a transmission screen. No reflection mirror is provided between the second lens group and the transmission screen and the image enlarged by the second lens group is directly projected on the transmission screen.

Abstract: An inexpensive projection lens unit in a rear projection type image display system, having a short focal distance (wide angle of viewing field), high focus and high contrast, and as well, including a power lens made of a glass material having a high refractive index in a range from 1.63 to 1.70 and an Abbe's number of not less than 50 with an optimized incident and emergent configuration in order to satisfactorily correct aberration with a enhanced focusing performance even with a shortened focal distance. Further, the power lens having a high refractive index can exhibit a high power, and accordingly, can carry out satisfactory aberration correction by optimizing the aspheric degree of a plastic lens even though the length of back focus is increased for enhancing the contrast.

Abstract: A projection optical unit for enlarged projection of an image displayed by an image display element includes a first projection optical unit having positive refractive power, and a second projection optical unit having positive refractive power for further enlarging the first enlarged image obtained by the first projection optical unit. The first projection optical unit is in an almost telecentric relationship with respect to the image display element side and the first enlarged image side, and the first enlarged image is formed at the image display element side, rather than at the second projection optical unit.

Abstract: Provided is a light guide display with a protective layer. The light guide display includes a plurality of aligned magnifying layers providing a viewing surface. Each magnifying layer includes a plurality of light guides, each light guide having an input end, a midsection, and an output end. The plurality of input ends are aligned. The plurality of output ends are aligned. A protective layer is coupled to the aligned output ends. An appropriate method of making a light guide screen with a protective layer is also provided.

Abstract: The present invention relates to a rear projection type image display device comprising projection lenses (2, 3) for projecting an image displayed on an image display element onto a transmission type screen (6) on a larger scale, an optical path turn-back mirror (7) for turning back halfway a light beam projected from the projection lenses, and a drive circuit for displaying an image on the image display element, that are fixedly housed within a housing (5). When a diagonal size of the transmission type screen (6), the depth of the housing (5), and the length from a lower end of the screen (6) to a lower end of the housing (5), are assumed to be SS (inch), D (inch), and L (inch), respectively, the following conditions are satisfied: SS >40, D?SS/3.0, L?SS/10.9.

Abstract: An inexpensive projection lens unit in a rear projection type image display system, having a short focal distance (wide angle of viewing field), high focus and high contrast, and as well, including a power lens made of a glass material having a high refractive index in a range from 1.63 to 1.70 and an Abbe's number of not less than 50 with an optimized incident and emergent configuration in order to satisfactorily correct aberration with a enhanced focusing performance even with a shortened focal distance. Further, the power lens having a high refractive index can exhibit a high power, and accordingly, can carry out satisfactory aberration correction by optimizing the aspheric degree of a plastic lens even though the length of back focus is increased for enhancing the contrast.

Abstract: A projection optical unit has two lens groups. A first projection optical unit disposed closest to an image display element, temporarily forms a first enlarged image (magnification: M1) at the image display element side, rather than at a second projection optical unit. The first enlarged image is subsequently projected in an enlarged form (magnification: M2, wherein M2>M1) onto a screen via the second projection optical unit. A field lens group having positive refractive power is disposed between the first projection optical unit and the second projection optical unit. Consequently, the relationship between F2, which is the F-value of the second projection optical unit, and F1, which is the F-value of the first projection optical unit, becomes F2=F1/M1, whereby it is possible to realize very-wide-angle imaging at a field angle exceeding 90 degrees.

Abstract: Light radiated from a light source passes through a liquid crystal display device and a projection lens and is reflected by a mirror, thus reaching a screen. The projection lens has a zoom function to scale up an image displayed on the display device by an arbitrary scaling factor. A microcomputer determines, based on an image signal, the scaling factor of the image to be displayed on the screen and controls a projection lens drive motor so that the image displayed on the display device may be projected onto the screen, scaled up by this scaling factor.

Abstract: A method and apparatus for producing an apparent increase in display brightness in an RPTV engine without an actual increase in total light output. Light is generated with an illumination source and optically processed to produce a light beam of rectangular format. The light beam is formed intentionally to have an intensity that is non-uniform, varying from a peak intensity at a center of the beam to a minimum intensity at a periphery of the beam. The optical processing step can include varying the intensity to selectively produce an illumination profile that decreases by at least about 30% to 70% from the peak intensity to the minimum intensity. The optical processing step can further include projecting the light beam through an integrator that is configured to produce an illumination profile that is at least partially controlled by a length of the integrator. The integrator can be configured so that a decrease in length will result in reduced uniformity.

Abstract: In order to achieve a great improvement in light utilizing efficiency, a projection type display apparatus for obliquely projecting an original image onto a screen includes a first projection optical system for projecting light from an original picture and forming an intermediate image having trapezoid distortion caused therein, a second projection optical system for obliquely projecting the light from the intermediate image onto a surface for projection so as to cause converse trapezoid distortion, and re-imaging it, and a light deflecting element for deflecting the optical axis of the first projection optical system so that the optical axis of the first projection optical system deflected by the light deflecting element is made to substantially coincide with the optical axis of the second projection optical system.

Abstract: An image projector includes a film assembly, motor, light source and lens. The film assembly includes a periscope having a first aperture, the film assembly being configured so as to mount a film to scroll in front of the first aperture of the periscope. The motor scrolls the film in front of the first aperture. The light source projects light through the periscope and portions of the film positioned in front of the first aperture of the periscope. The lens focuses the light projected through the film and the periscope.

Abstract: In a rear projector for projecting an image from behind a screen, its screen size is variable. In order to permit flexible adaptation to the variation in the screen size, the projector is constructed to permit easy adjustment of a detection device for detecting an image display position or a position indicated on the screen.

Abstract: A system detects reflected light from a projection screen associated with a projection display. Reflected light may be analyzed to determine whether the projector is in focus. This information may be used to create input signals that automatically focus the projection display.

Abstract: An image projection system includes an image generator, a screen and a focus and aim component. The focus and aim component receives modulated light from the image generator and focuses and deflects the light as a function of a position on the screen. The component consists of an array of lenslets with wedge. The wedge or prism refracts the light and the lens focuses the light. As a result, the optics are selectively tailored to provide a clear image over the entire field of view, even in systems compact in depth that would otherwise rely on a short focal length lens. Acute incidence angles at the periphery of the screen are handled by TIR Fresnel lens elements or by diffractive elements. The focus and aim capability is alternatively provided by holographic elements in a holographic array.

Abstract: A method for mass-producing eccentric Fresnel lens sheets comprising the steps of: preparing a number of concentric Fresnel lens sheets; dividing the concentric Fresnel lens sheets into a first set and a second set each including a plurality of Fresnel lens sheets; cutting out a plurality of first sheets each corresponding to one portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the first set; cutting out a plurality of second sheets each corresponding to the other portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the second set; and bonding each of the first sheets and each of the second sheets in such a manner that patterns on the first sheet and the second sheet are continuous to prepare a plurality of eccentric Fresnel lens sheet. The second set can include a third set and a fourth set and a plurality of third sheets are cut out from the third set and a plurality of fourth sheets are cut out from the fourth set.

Abstract: A cam cylinder is extended from a base member of a holder and is inserted into a guide cylinder secured to a main body. A lens mount including an optical system and a CCD is inserted into the cam cylinder. A guide pin is screwed on the lens mount through a guide groove of the guide cylinder and a cam groove of the cam cylinder. When the holder is rotated around the optical axis, the lens mount can move along the optical axis, so that a distance between the CCD and a film held by the holder is changed. As a result, by only rotating the holder, the magnification for displaying the image can be changed.

Abstract: A projection inspector which projects the image of an object being measured onto a screen for a visual inspection. It may be used with a microscope for observation in detail. Unlike the conventional projection inspector, the inspector fully exhibits high degree of measuring function even at the time of inspecting an object having a surface color and shape that can be difficultly imaged, and projects the object's image onto the screen to inspect it, and further enables the object's image to be more correctly observed or inspected using a microscope.

Abstract: A magnifier apparatus for use with a hand-held video display apparatus which magnifier apparatus has a frame with a magnifier lens, the frame secured to a support, the support releasably adapted to be secured in a snap-in relationship to the sides of the housing of the video display apparatus in an upright, correct position, the frame with the magnifier lens adapted to move between an open, use position over the screen of the video display apparatus and a closed, non-use position nested within the support.

Abstract: A projecting apparatus comprises support device for supporting an original, a projection optical system for forming the image of the original, an optical element disposed on the image side of the projection optical system to cause a principal light ray having entered from the original through the projection optical system to travel in parallelism to the optic axis of the projection optical system, and control device for varying the imaging magnification of the original by the projection optical system with the spacing between the exit pupil of the projection optical system and the optical element being kept constant.

Abstract: A microfilm image reader apparatus for detecting an image on a microfilm strip and projecting the detected image onto a target plane, wherein a beam of light bearing an image detected from the microfilm strip is produced by illuminating the microfilm strip and is projected through a projection lens onto the target plane, and wherein an automatic mode of focus control is established through detection of a condition in which the image-bearing beam is focussed with respect to the target plane and, when it is detected that the automatic mode of focus control is inoperable, the projection lens is automatically moved to a position having its focal plane located on a predetermined plane with respect to the target plane and, after the projection lens is moved to such a position, the focal plane of the projection lens may be manually adjusted by the operator of the apparatus.

Abstract: A microfilm image processing apparatus in which a plurality of zoom lenses having different ranges of magnification are provided for selective use and in which each of the zoom lenses has an associated zoom control gear coaxially disposed aroung the lens to be capable of driving the associated zoom lens for axial movement to vary the effective magnificatio ratio to be achieved by the lens, wherein an angular position detector of, for example, the stroboscopic pickup type is provided in conjunction with the zoom control gear on at least one of the zoom lenses to detect the angular position of each of the zoom lenses and thereby determine the magnification ratios achievable by the individual zoom lenses, and an integral magnification ratio detector is provided in association with the zoom control gear on each of the zoom lenses to detect a particular angular position of the associated zoom control gear, the particular angular position of each zoom lens being such that the zoom lens associated with the gear prov

Abstract: A clothing image mirror projection system for producing a composite image of an article of clothing superimposed upon the reflected image of a viewer's face includes a two-way mirror, a rear projection screen, and apparatus for projecting an image of an article of clothing onto said rear projection screen. The present system includes an anamorphic lens assembly to adjust the dimensions of the clothing image along a horizontal axis. Further, the present system includes means by which the height and weight of the subject are measured by sensors, and used to automatically adjust the height and width of the clothing image so as to fit the height and general size of the subject viewer.

Abstract: The photographic projector is adapted that a lens seating plate to which a projecting lens is fixed is provided so that it maybe moved in the optical direction with respect to the lens holder. When the base of the lens holder reaches even to the end of its stroke, distance of the original picture or that of the picture image from the base of the lens holder is still deficient in reaching to the value which corresponds to desired magnification, the lens seating plate is moved a desired amount along the optical axis so that the lens may be set up a position corresponding to any desired magnification.

Abstract: A folding slide viewer has a rear projection screen which swings into a ft position for storage. In a second, operating position, the projection screen it is provided with a lightproof bellows. The optical axis of the lens system is inclined at an angle with respect to the horizontal base of the housing. A reflector is along the optical axis of the lens system, when the screen is in its operating position, to reflect an image onto the screen. An image trap is swingable between a first position perpendicular to a longitudinal axis of the slide magazine and a second position perpendicular to the optical axis of the lens system.

Abstract: The installation permits the adjustment in succession on a screen E of the size of a series of typical images which are to be made to merge with the image of a person P so as to enable this person to view through a mirror M composite images thus obtained. The projector and its mirror M 2 are slidably mounted on a funicular railway whose rails 16 and 17 have a slope equal to the slope of the lowest ray of the projected beam.

Abstract: The microfiche reader has two lenses carried by a segment mounted on an eccentric pivot which can be adjusted to move the pivot and, therefore, the lenses are in an eliptical orbit which permits the lens in the operative position to be centered on the optical path. When the segment is shifted to move the other lens into position that lens will be centered. Each lens is focused by moving the associated focusing slide in and out to move the parallel cams under the bosses carried by the lens barrel flange to raise and lower the lens to focus the image. The image is centered on the screen by adjusting the first mirror which is mounted on a bracket which pivots on a housing partition and has a wedge between the bracket and the partition. The bracket has teeth which engage serrations on the wedge so when the retaining screw is tightened the wedge is locked in place.

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: A magnification of the displayed image of an opaque reader can be changed between first and second values by a single manual movement. A diopter lens disposed in front of the projection lens provides a first magnification. The single movement functions to remove the diopter lens and simultaneously shift axially the position of the projection lens thereby providing the desired second magnification, the simultaneous movement of the diopter and projection lens from first to second positions assuring that the magnified images under both magnifications are in focus.

Abstract: A rear projection viewer apparatus of the type wherein a projected image is projected towards a primary viewing screen which when in its operative viewing position forms the front of the viewer, the front viewing screen being attached to other portions of the viewer housing so that it may be moved to an inoperative position. A second rear projection screen substantially smaller than the first screen is mounted within the viewer housing in a manner where it may be moved from an inoperative position where it does not interfere with projecting to the primary viewing screen to an operative position wherein the images may be projected upon the rear thereof. Means are provided for automatically moving the small auxiliary screen from its inoperative position to its operative position in response to manual displacement of the primary viewing screen from its operative position to its inoperative position.

Abstract: A rear projection viewer apparatus of the type wherein a projected image is projected towards a primary viewing screen forming the front of the viewer, the front viewing screen being removably located with respect to other portions of the viewer housing so that it may be removed from the path of the projected images. A second rear projection screen substantially smaller than the first screen is provided. The small screen and selected portions of the viewer housing are provided with complementary structure for selectively locating the second screen at an operative position substantially normal to the projection axis and at a location therealong substantially closer to the image projecting means than the first rear projection screen when it is in its operative position.

Abstract: A microfiche viewer structured for examining new microfiche film. The film is typically still in roll form as it comes from the microfiche camera. Plural magnifications of the microfiche image are selectively available; one, to reproduce a whole fiche upon the viewing screen for general observation of photographic quality, the other, to reproduce perhaps four frames of a whole microfiche for detailed observation of quality. The apparatus is structured for convenience in viewing. The different magnifications are obtained by selectively interposing objective lenses of different focal length in the light path adjacent to the microfiche film on the side opposite to that occupied by a light source. Motor driven film transport means are provided atop the apparatus proper.

Abstract: An apparatus for displaying a magnified image having a console with a rear lighted projection screen, the console including a light source, a specimen holder, and a lens system for displaying a magnified image of the specimen on the rear surface of the screen, the console being arranged such that the screen is mounted for easy view by the user, the improvement including a magnifying glass supported by the console in front of the screen and variable in spacing with the screen for focusing by the user, the magnifying glass being movable over at least a significant portion of the screen so that the user can obtain a magnified view of selectable portions of the screen through the magnifying glass.

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.

Abstract: A film projection viewing system employs a projector to receive cartridges loaded into the projector in a manner completing a light path through the projector to a viewing screen. A film projector and cartridge having a substantially self-contained film transport therein cooperates to provide a system having a lens system with a focal length setable to a predetermined position in response to insertion of a cartridge into the projector.