Abstract: A visual and audio system for theaters includes a spherical screen having a desired radius of curvature while having a surface reflectivity of 5-50%, and a projector located at a focal point of the spherical screen. The curvature radius of the spherical screen corresponds to the projection distance of the projector. The image projected from the projector at the focal point of the spherical screen is reflected from the spherical screen in a horizontal direction. Accordingly, viewers can view images projected on the screen corresponding to 5-50 time the brightness of images viewed on conventional theaters screens. Central speakers are arranged at the focal point of the spherical screen, so that viewers perceive the sound effect as coming directly from the spherical screen. This visual and audio system can be effectively used in theaters for stereoscopic moves, theaters for high resolution images, and theaters for viewing of images at a higher brightness such as sports arenas, and restaurant theaters, etc.

Abstract: Disclosed is a method for optimizing a driving input signal in an ink jet head using shape memory alloy.

Abstract: Disclosed is a visual and audio system for theaters including a spherical screen having a desired radius of curvature while having a surface reflectivity of 5-50%, and a projector located at a focal point of the spherical screen. The curvature radius of the spherical screen corresponds to the projection distance of the projector. The image projected from the projector at the focal point of the spherical screen is reflected from the spherical screen in a horizontal direction. Accordingly, viewers can view images projected on the screen corresponding to 5-50 times the brightness of conventional cases. Central speakers are arranged at the focal point of the spherical screen, so that viewers perceive the sound effect as coming directly from the spherical screen. This visual and audio system can be effectively used in theaters for stereoscopic movies, theaters for high resolution images, and theaters for viewing of images at a higher brightness such as theaters for sports broadcasts, and restaurant theaters, etc.

Abstract: A clamshell device for printers is disclosed. This clamshell device has a main body including a paper roll seat opening used for installing a paper roll therein, with an inclined guide surface formed at the upper edge of each sideall defining the paper roll seat opening. A roller frame is hinged to the main body, and is used for selectively closing the paper roll seat opening. This roller frame has a rubber roller coming into compression contact with a holding roller of the main body so as to compress paper passing through the nip of the two rollers. A locking post is movably set within two longitudinal slits of the roller frame at opposite ends thereof, and is movable along the guide surfaces of the main body while being changed in its position within the longitudinal slits during a rotation of the roller frame relative to the main body.

Abstract: The present invention relates to an actuator for an ink jet printer head using a shape memory alloy which includes a lower space part; a silicon substrate where said lower space part is formed; an insulating film formed on said silicon substrate surface and made of a silicon oxide film which acts to push the shape memory alloy film to nozzle side direction and a silicon nitride film which acts to pull the shape memory alloy film in a direction opposite to nozzle side; and a shape memory alloy layer formed upon said insulation film so as to cover said lower space part. The invention can make effect to prevent print state deterioration by repetitive use as it can minimize actuator fatigue phenomenon by repetitive use by way of initial transformation direction and magniture control according to insulation film formation of adequate composition and thickness.

Abstract: A clamshell device for printers is disclosed. This clamshell device has a main body including a paper roll seat opening used for installing a paper roll therein, with an inclined guide surface formed at the upper edge of each sidewall defining the paper roll seat opening. A roller frame is hinged to the main body, and is used for selectively closing the paper roll seat opening. This roller frame has a rubber roller coming into compression contact with a holding roller of the main body so as to compress paper passing through the nip of the two rollers. A locking post is movably set within two longitudinal slits of the roller frame at opposite ends thereof, and is movable along the guide surfaces of the main body while being changed in its position within the longitudinal slits during a rotation of the roller frame relative to the main body. A spring is held on the roller frame at a first end thereof and on the main body at a second end thereof, and normally applies elastic force to the roller frame.

Abstract: Disclosed are a printer head using shape memory alloy and a method for manufacturing the same.

Abstract: In an apparatus and method for injecting a recording solution of a print head, a second thin film capable of regulating deforming quantity and buckling force of a vibration plate is coupled to a thin film shape memory alloy by using a semiconductor thin film fabricating process to increase the buckling force when the thin film shape memory alloy is cooled down to be buckled to its initial bending-deformed state. Thus, the time taken for buckling to the bending-deformed state of the vibration plate after injecting the recording solution is reduced and the operating frequency is increased to heighten printing speed, and rigidity of the vibration plate is heightened to reduce a concern about a damage by an external shock.

Abstract: In an apparatus for injecting a recording solution of a print head, a buckling force of a thin film shape memory alloy is increased by a pressure lower than an atmospheric pressure when the thin film shape memory alloy is cooled down to be buckled to its initial state. Thus, time taken for refilling a liquid chamber after the recording solution is injected, i.e., an operating frequency, is increased to enhance printing performance.

Abstract: An apparatus for automatically recognizing recording time of a time-lapse recorder (TLV) in a closed circuit television (CCTV) system is provided. The automatic TLV-recording time recognizing apparatus includes: a buffer for restoring attenuation of a trigger pulse signal output from the TLV and removing noise of the trigger pulse signal to improve signal driving capability; a mono-stable multivibrator for detecting the trigger pulse signal from a signal output from the buffer and performing a retrigger function; a pulse cycle comparator for comparing the cycle of the trigger pulse signal output from the buffer with a predetermined reference value; and a recording mode determiner for determining the recording mode of the connection switching device corresponding to the recording time of the TLV based on the output data of the mono-stable multivibrator and the pulse cycle comparator.

Abstract: In a recording apparatus, one marking fluid container is cantilevered from one end at one side of a chamber. The one marking fluid container has an ejection hole and an internal passage from the ejection hole to the chamber for supplying marking fluid from the chamber to the ejection hole, whereby the marking fluid is ejected from the ejection hole by inertia upon release of flexural bending of the one marking fluid container for recording on a recording medium. Another marking fluid container extends in a second direction from one end cantilevered at an opposite side of the chamber. The one marking fluid container has a rectangular cross section transverse to the first direction for accommodating still another marking fluid container in a row. The one and other marking fluid containers cantilevered from the opposite sides of the chamber are parallel and staggered relative to each other.

Abstract: An iris driving circuit, adapted to a color video camera, detects excessive intensity of radiation above a predetermined level from a white-colored subject so that an iris is controlled to optimize the function of auto white balance.

Abstract: A chrominance subcarrier generating circuit for adjusting output levels of a plurality of chrominance subcarriers having different phases to the optimum level is disclosed. A filter removes harmonic components from the square signals to extract only the sinusolidal subcarriers, a first terminal provides first chrominance subcarriers after blocking DC components, a phase-shifter shifts the phases of the chrominance subcarriers, another terminal provides second chrominance subcarriers after blocking the DC components, and a power source filter and an auxiliary power source filter for preventing the first and second chrominance subcarriers from influencing other power sources and for blocking the noise coming from other power sources. Levels of the first and second chrominance subcarriers can be set properly regardless of the characteristics of the transistors.

Abstract: An automatic optical filter displacing circuit for optimizing the white balance of video cameras is disclosed which comprises a buffer means; a sample and holder means for producing average values of the buffered luminance signals and for carrying out a sampling out of the average values; a first reference signal supply means; a first comparing means; a second reference signal supply means; a second comparing means; an optical filter control means; a trigger means for generating a white balance setting signal automatically; and a power supply means. The optical filters are automatically displaced so as to achieve the optimum state of the white balance by making judgements on the color temperature condition and the light amount condition of the illumination, and the electrical corrections are decided optimally depending on the illuminating conditions, thereby producing a good image quality.

Abstract: A noise reduction circuit for video contour emphasis signal including an amplification circuit for the contour signal, mean value detection circuit for the contour signal, a noise reduction level control circuit, positive and negative noise reduction circuit and output level control circuit, thereby eliminating the noise signal included in the contour signal and improving the signal to noise ratio.