Abstract: With the purpose of controlling a light source to appropriately reduce the brightness of reflected light at the time of starting projection according to the conditions under which a projector is being used, the projector includes a solid-state light source unit that emits light, a power supply unit that supplies driving electric power to the solid-state light source unit, an image display device that modulates the light emitted from the solid-state light source unit according to an image signal and that projects the modulated light onto a projection surface, and a detection unit that detects the intensity of the ambient light of the projection surface. Upon receiving a lighting signal that indicates that the solid-state light source unit is to be lit, a control unit controls the power supply unit according to the intensity of the light detected by the detection unit to incrementally raise the driving electric power supplied from the power supply unit to the solid state light source unit.

Abstract: Telecommunication devices each having projection apparatuses capable of projecting ambiently displayed images at locations proximate to the telecommunication devices on surfaces that are substantially parallel to planes formed by the telecommunication devices are described herein. The telecommunication devices also have logic configured to provide predistorted images to the projection apparatuses, the predistorted images appearing without distortion when projected by the projection apparatuses on the surfaces in the ambiently displayed images.

Abstract: The present disclosure is directed towards a multimedia system comprising a multimedia reader. The multimedia reader may be configured to read multimedia content and to extract light surround content. The light surround content may represent a light surround control signal. The light surround content may be extracted from the multimedia content. The multimedia reader may also be configured to output the light surround control signal. Further, the multimedia system may also include one or more light emitting devices. Each light emitting device may be in communication with the multimedia reader. Each light emitting device may be configured to receive the light surround control signal and to control a light characteristic based upon, at least in part the light surround control signal. Numerous other embodiments are also within the scope of the present disclosure.

Abstract: A safety interlock system for a projector system is provided. The projector system has a lamp, a controller and ballast for powering the lamp upon receipt of a lamp enable signal from the controller. The projector system further has a safety inter-lock system for deactivating the lamp in the event the lamp is not properly installed.

Abstract: An illumination system adapted for a projection apparatus is provided. The illumination system comprises a cooling air guiding apparatus, a lamp, and a cooling fan. The cooling air guiding apparatus comprises an air intake device and an adjustment device, while the adjustment device comprises an air-flow adjustment element and an air-flow guiding element. The cooling fan generates a cooling air, which flows from the exterior through the air intake device into the air-flow adjustment element. The air-flow guiding element guides the cooling air in the air-flow adjustment element out of an air-flow adjustment hole towards a specific direction. Since the adjustment device may move relatively to the air intake device, the air-flow adjustment hole is adapted to move from the first position substantially aligned with the opening to the second position constituting a substantial displacement with respect to the opening. The cooling air can cool the lamp no matter what angle the projection apparatus is disposed.

Abstract: There is provided a light source unit which includes a luminescent light source which receives excitation light so as to emit light of a predetermined wavelength band, excitation light sources which shine excitation light on to the luminescent light source, a reflection space having the luminescent light source in an interior thereof and an emission space which emits luminescent light source light emitted from the reflection space from an emission port whose area is made smaller than the area of the luminescent light source and a projector which employs the light source unit.

Abstract: A projection display apparatus 101 in which the light quantity adjusting means has a simple and readily interchangeable structure, and which can improve image quality by adjusting the quantity of light received by a light valve continuously, without causing illuminance irregularities, and without having unwanted light radiated onto the screen, the light quantity adjusting means 9 having light blocking members 91L, 91R for blocking light in transit to a second lens array 22, and rotational axes 91LA, 91RA for turnably supporting each of the light blocking members on an xy plane, the light blocking members 91L, 91R and rotational axes 91LA, 91RA being positioned so that the rotational axes 91LA, 91RA are disposed in positions symmetric with respect to the optical axis AX on the xy plane, and the turning range from the light blocking initiation position at which the light blocking members 91L, 91R, by being turned, start to block light in transit toward the second lens array 22 to the maximum light blocking posi

Abstract: A liquid crystal rear projector device of the present invention includes a lamp unit providing a light source, a cooling fan for cooling the lamp unit, and an optical system for generating color image light with the lamp unit providing a light source, the lamp unit including a light emitting tube providing a light source, and a reflector for reflecting light emitted from the light emitting tube toward the optical system. The reflector has an air introduction hole for introducing air discharged from the cooling fan into the reflector, which is provided near the spherical portion of the light emitting tube, and faces to a vertical top of the spherical portion to blow the air to the top.

Abstract: A laser projector including a green diode pumped microchip laser module projecting a green laser beam, an optical sensor receiving the laser beam, a power control circuit for the green diode pumped microchip laser module receiving a signal from the optical sensor relative to the power output of the laser beam, and control electronics receiving the signal from the optical sensor connected to the power control circuit modulating the power output of the green diode pumped microchip laser module to maintain a substantially constant power output from the green diode pumped microchip laser module.

Abstract: A lighting device is provided for projecting a pixelated lighting pattern to be viewed onto a surface facing said device is provided. The device comprises a plurality of independently controllable lighting units (1), each lighting unit comprising at least one light-emitting diode (3, 4, 5, 6), and a controller (7) for controlling the emission of light from said lighting units. A device according to the present invention allows ambient illumination of a surface and projection of images and patterns.

Abstract: A method for driving a high-pressure gas discharge lamp of a projector system, which is suitable to produce and to supply to a light valve device during a projection interval (4) a light beam of a basic color which is selected from several basic colors (G, R, B). The lamp is driven by a lamp current. During said projection interval light valves of the light valve device are controlled in a pulse width modulation manner to have each valve provide a respective wanted light integral over said projection interval. During at least one of a number of successive projection intervals associated with one basic color a magnitude of the lamp current is temporarily reduced for at least a time that all light valves can be controlled for said one basic color.

Abstract: A video projector generates a black screen. Further, the video projector reduces the brightness of the light source which reduces the power level of the video projection system. Since the light source's power is reduced, less heat is generated by the video projector and the video projector's cooling fan may be slowed down. As a result, the video projector produces less noise.

Abstract: When a video signal is inputted to a projector (10) through a video input terminal, a luminance peak value of an image of the video signal is detected by an image-analyzing circuit (61) to be outputted to a CPU (71). A gain-adjusting circuit (63) adjusts a luminance signal in the video signal based on a command from the CPU (71). The CPU (71) determines a gain adjustment amount based on the luminance peak value of the image obtained by the image-analyzing circuit (61) and outputs the result to the gain-adjusting circuit (63). For instance, when the luminance peak value (Ip) of the image is 50% of the upper limit (Imax) thereof, a gain-adjusting amount AG is doubled. In this case, an illuminating light volume of a light valve (44a) has to be reduced to 50%, which is achieved by light-attenuation by a light-source lamp (21) and an open/close light shield (23).

Abstract: A stage lighting apparatus includes a lamp and a first light valve, which cooperate to project a first image and a second image wherein the second image is created by applying a function to a plurality of pixels of the first image. The plurality of pixels of the first image may be arranged in a straight line. Applying the function to the plurality of pixels of the first image may cause first, second, third, and fourth sets of the plurality of pixels to deviate from the straight line in first, second, third, and fourth directions, respectively.

Abstract: A method of operating a projection system with at least one high intensity discharge lamp (HID lamp), a rotatable color disc with at least three segments of different colors, and an array (DMD) comprising a plurality of individually movable mirrors, wherein the current strength of the electrical operating current supplied to the HID lamp is varied in time such that the light arc of the lamp is stabilized, is to be constructed such that the power and operational life of the HID lamp used are optimized. The current strength of the operating current for the HID lamp is for this purpose varied such that the current strength reaches a maximum when a given segment of the color disc, and preferably exclusively this segment, is present in the radiation path of the light rays used for the projection.

Abstract: A high-reliability display system is disclosed. The display system includes a plurality of projection channels. Each projection channel projects a substantially mutually exclusive portion of an image onto a display area. A controller determines the content and size of each portion that each projection channel projects onto the display area so that the image substantially fills the display area during normal conditions. When one of the projection channels is inoperative, the controller adjusts the portions of the image that are projected by the operative projection channels to optimize the image on the display area.

Abstract: A frame sequential color display projection system (110) of this invention includes an arc lamp (112) having a predetermined power rating for providing a source of polychromatic light that propagates through a color wheel (120) that sequentially provides R, G, B, and optionally, W light colors during respective sequential time periods. A display controller (131) is synchronized with the color wheel to generate color image data during the respective time periods. A light valve, such as a DMD (130), receives the color image data for generating the frame sequential color display. A lamp ballast (156) is also synchronized with the color wheel to provide nominal and boosted power levels (212) to the arc lamp during selected ones of the time periods such that the projector provides a brighter, color-adjusted display without requiring the arc lamp to operate at an average power level exceeding its predetermined power rating.

Abstract: Disclosed is a projection display apparatus in which the optical axis of a lamp and that of an optical unit can be easily made coincide with each other irrespective of dimensional variations of component parts. A lamp holder (32) is movably attached to a ride side plate (37) of a lamp case by extension springs (63). The center of a lamp (1) is positioned on the optical axis (20x) of an optical unit (20) by a circular arc wall face (32f) of the lamp holder (32) and a V-shaped member (45) fixed to the optical unit (20). The optical axis (1x) of the lamp (1) and the optical axis (20x) of the optical unit (20) are set to be parallel to each other by a slide reference face (20a) of the optical unit (20) and three projections of the lamp holder (32). Since the lamp holder (32) is not fixed to a lamp house, an influence of accumulation of dimensional variations of components such as the lamp house exerted on the adjustment of the optical axes of the lamp (1) and the optical unit (20) can be minimized.

Abstract: A slide projector having two projection optics systems (12,14) for display of slides on a screen. Each projection optics system includes a fixed position slide gate (24, 36) into and from which slides move relative to a circular slide tray (16), which rotates about a fixed vertical axis to access each compartment therein relative to both slide gates.

Abstract: An apparatus for controlling the light intensity output from an arc lamp for use with an arc lamp-illuminated projector includes a light valve to control the projector output light intensity by the selective positioning of the light valve in all or a portion of the light path between the arc lamp and the projector output. The light valve is operatively coupled to the output of a magnetically coupled clutch, the input of the clutch being continuously driven by a motor. A programmer applies a voltage proportional to the desired light intensity to the clutch for controlling the degree of magnetic coupling, and therefore the position of the light valve. The variable torque applied through the clutch to the light valve may be countered by a variable counter-torque produced as by a spring to establish the desired continuous range of equilibrium positions of the light valve.

Abstract: A series of slides are placed in a vertical loader and are movable alternatively into respective ones of two projection positions. Each slide is moved laterally of the loader by a carriage, then pushed to the projection position by a push rod. During projection the following slide in the loader is similarly moved to the other projection position. After its projection, the first slide is brought back by a further push rod to its carriage and then is moved by the carriage to be deposited in a receptacle and be replaced by a new slide which will be moved into the same projection position.

Abstract: A photographic film projection system includes a plurality of projectors, one of which is an arc lamp projector, and a dissolver instrument whose controlled output power to the arc lamp projector is a phase controlled average a.c. power. The arc lamp projector has a light valve comprising a motor means linearly responsive to average power, for example, a moving iron galvanometer, and a movable means, such as a louvre, positioned between the arc lamp and the film gate.

Abstract: The projector includes two projection optics systems and two slide gates which move slides acquired from a slide receptacle into and out of a viewing position in all of the projection optics systems. The slide gates are movable between a first position, which is common to both slide gates and in which slides are moved between the slide receptacle and the side gate means, and the second position in one of the projection optics systems. The slides move by gravity from the slide receptacle into the slide gates and by means of a slide lifter from the slide gates back into the slide receptacle. A combination of a scalloped gear matching the depending lugs on the slide receptacle and a stepping motor to control the movement of the gear provides efficient and economical control over the movement of the slide receptacle. The slide gates, the slide lifter, and the slide receptacle gearing are independent of each other in operation, so that they may be activated in any sequence.

Abstract: A projection device provided with at least two different enlarging projection systems for the projection on a screen of a set of at least two slides provided on one carrier, said slides covering the same area of a plan or map, one slide being more detailed than the other. The device projects the first less detailed slide entirely and the second or next, more detailed slide only in part but on a larger scale.The device comprises further a transparent runner indicating on the first slide the part of the next slide that is projected.

Abstract: A multimedia motion picture and photographic slide projection control apparatus which permits a plurality of projector devices to be controlled from an operator's console. Manually operable switch means, operating through digital control means, develops a Program Command Code Word for each change in switch conditions, the control word being decoded to provide an ON/OFF response by selected projectors, as well as lamp dissolve rate response. Simultaneously, the Program Command Code Words are recorded on a magnetic tape such that when a given presentation has been developed to the satisfaction of the operator, the stored command words can be used to control the projection devices to provide repetitive performances of the same audio-visual presentation.

Abstract: A control system synchronizes the operation of a plurality of controlled mechanisms such as slide projectors by means of unique frequency tone-binary code signals recorded on a magnetic tape. In a particular embodiment, six slide projectors and one movie projector are controlled in any desired combination or sequence and with two different fade-in, fade-out speeds and in synchronism with an audio program on another track of the tape.In this specific embodiment, four different frequency tones are used in conjunction with binary codes to provide unique slide advance and lamp control of the projectors.An encoder enables the user to make up his own programmed tapes.

Abstract: A control system for the control of special functions in multiple projector systems is disclosed. The system can effect fading, blending and mixing at different speeds in forward and reverse projector directions. The system includes a freely programmable memory, such as a cross-bar distributor for storing program instructions. The program memory may be modified by changing the location of plug-in diodes at cross-over points between rows and columns of the cross-bar distributor. A selector is provided for extracting a portion of the programmed memory. The selector may include an automatic portion such as a stepping switch for changing the portion of the program selected. The selector provides binary coded signals representative of program instructions to a decoder. The decoder decodes the digital signals and provides control signals for effecting control of the light sources in each projector. The decoder includes a different charge-discharge circuit for each projector.

Abstract: A picture slide projector having provision for automatic focusing (i.e., provision for automatically keeping the projection lens and the picture slide at a constant distance from each other notwithstanding a buckling displacement of the slide under the influence of heat) is provided with means for moving the projection lens axially relative to the picture slide, to an out-of-focus position to produce a fading or dissolving effect on the viewing screen, while the slide is being withdrawn from the slide holder or gate and replaced by another slide. At the same time, the automatic focusing mechanism is rendered inoperative. Preferably also at the same time, the projection lamp is dimmed. When the slide changing operation is completed, the automatic focusing mechanism is rendered operative, and it serves to bring the projection lens back axially to the sharp focus position, the projection lamp being simultaneously brightened.

Abstract: The invention uses frequency control of lamps and magazines in projectors and is especially adapted for programmed control by recording the frequency signals produced by previous rehearsal of the programme under manual control. The circuit uses an integrated voltage from the frequency signal to control threshold devices operating triggered switches controlling supply to the lamps, and to actuate a magazine control; a saw tooth signal being used as the basic timing signal in operating the lamps.

Abstract: A frame sequential color display projection system (110) of this invention includes an arc lamp (112) having a predetermined power rating for providing a source of polychromatic light that propagates through a color wheel (120) that sequentially provides R, G, B, and optionally, W light colors during respective sequential time periods. A display controller (131) is synchronized with the color wheel to generate color image data during the respective time periods. A light valve, such as a DMD (130), receives the color image data for generating the frame sequential color display. A lamp ballast (156) is also synchronized with the color wheel to provide nominal and boosted power levels (212) to the arc lamp during selected ones of the time periods such that the projector provides a brighter, color-adjusted display without requiring the arc lamp to operate at an average power level exceeding its predetermined power rating.