Abstract: In the matrix, a positive type liquid crystal of the twisted nematic type is driven by a thin film transistor arranged on a transparent substrate. The polarity of the video signal, originally generated for a cathode ray tube, is inverted within a driving circuit and the inverted negative video signal is used to drive the positive type liquid crystal display. In the range of voltages of the video signal which correspond to the white level, the active matrix panel is driven by stretching the voltage of the video signal such that comparable voltage-contrast characteristics are achieved with the liquid crystal display as with the cathode ray tube. Leakage current of the thin film transistor during off-periods is reduced by setting a gate voltage during the off-period which is within the range of voltage level of the power source.

Abstract: The optical printing apparatus comprises a fluorescent lamp light source, a shield plate for blocking substantially all of the light emitted from the light source, a liquid crystal panel subject to irradiation with the light emitted from the light source and passing through a slit in the shield plate. The liquid crystal panel includes a plurality of light valves. A driver is disposed on the outside of the shield plate for selectively opening and closing the light valves. Fibers disposed below the liquid crystal panel and functionally equivalent to a self-focusing lens direct incident light, which has passed through the light valves, onto a photosensitive drum and printing is completed in the conventional manner. The light source, slit, liquid crystal panel and fibers are arranged in a line. The temperature and brightness of the light source are precisely controlled with feedback circuits and the liquid crystal panel is temperature controlled.

Abstract: An improved folding game book is provided. Each sheet of the game book has a fold line and each sheet is folded along its fold line to define four panels. A completed game, puzzle, maze or other self contained packaged information is printed on the four panels of each individual sheet. A plurality of sheets are then positioned so that the fold line of each sheet is in engaged alignment with the fold line of the sheets directly adjacent to it, thus forming a package. This package is then secured by joining all sheets together at the fold line with a staple or other suitable fastener. This construction provides a folding game book in which each sheet may be removed from the others and stand alone as at least one game.

Abstract: An ink-on-demand type ink jet printer includes an ink jet head assembly having a printer head and an ink container integrally joined to the printer head. The printer head includes a pressure chamber and ink supply and ejection flow passages communicating respectively therewith. The ink container includes therein a narrow air-bubble blocking tube opening directly into a lower portion of the interior of the ink container and which connects the ink supply flow passage to the ink container. A vent hole is defined in an upper portion of the ink container. The ink container includes a wall surface with the wall surface not trapping air bubbles, with a surface of the vent hole being coated with a defoaming agent.

Abstract: A tag pin fastener assembly includes a first tag pin assembly member having a first connecting rod and a plurality of tag pins coupled to the first connecting rod in a predetermined spacing, and a second tag pin assembly member having a second connecting rod and a plurality of tag pins coupled to the second connecting rod in the same predetermined spacing. The two connecting rods are coupled together so that the tag pins on the first rod are alternately arranged with the tag pins on the second rod.

Abstract: A watch dial is provided comprising a plastic or metal base plate. The base plate has thereon an uneven portion embodying a surface design, letter, window, symbol or mark. The uneven portion is formed by exposing photosensitive resin to ultraviolet light. The surface of the photosensitive resin portion of the base plate is metal-plated.

Abstract: An active matrix assembly for a liquid crystal display device utilizing an MIS (metal-insulator-semiconductor) transistor array is provided. The active matrix assembly includes a transparent substrate, a first thin layer of silicon disposed thereon, an insulating film on the first silicon layer and a second thin layer of silicon disposed on the insulating film. The layers are selectively etched for forming a gate and the silicon layers are doped for forming a MOS transistor for a display element of the device. The two silicon layers and insulating material intersect to form capacitors with the upper electrode of the storage capacitor being the driving electrode for the liquid crystal. An active matrix assembly constructed and arranged in accordance with the invention permits 90 percent or more of incident light coming from above to pass therethrough.

Abstract: A separable fastener of the press-on/pull-off types comprises similar first and second fastener members, each member including a base having a plurality of tapered projections extending from one face surface and a plurality of tapered receptacles recessed into the face surface. Projections and receptacles are positioned in identical patterns and spacings, each projection and receptacle being totally surrounded and isolated by a portion of the base material. The projections on each fastener member are contoured to engage in the receptacles of the other fastener member with a releasable friction fit.

Abstract: A continuously variable multi-focal soft contact lens wherein a continuous optical gradient in a region smaller than the maximum pupil opening is provided. The concave surface is aspheric with a desired optical power for distant viewing at the center which increases to the desired near vision power. The increase is usually about 3 to 5 diopters within 6 mm of the anterior optical zone (AOZ) which is approximately 9.7 mm in diameter when wet. Outside this 6 mm zone the concave surface is essentially spherical. The concave surface is an aspheric curve having a steeper curve in the middle than a base curve r.sub.2. The curve at the center is the steepest and is designated as r.sub.2 '. Once r.sub.2 and r.sub.2 ' curves are determined, the thickness of the lens (t) and the radius of curavation for AOZ designated r.sub.1 is calculated using the desired optical power at the apex of the lens (P.sub.

Abstract: A three wheeled vehicle with an elongated body and independent front and rear steering is provided. The vehicle is preferably a pedal driven three wheeled vehicle. The rear wheels are mounted on a rear wheel assembly which is pivotably mounted on the body and displaced by a control lever mounted on one side of the body.

Abstract: Ophthalmic lenses wherein the curvature of the refractive surface changes along the principal meridian between the optical center of a far vision viewing zone and the optical center of a near vision viewing zone in accordance with a predetermined law is provided. The refractive surfaces of the lenses are divided into a far vision viewing zone, an intermediate vision viewing zone and a near vision viewing zone by a curve which intersects the principal meridian curve at the optical center of the far vision viewing zone and a second curve which intersects the principal meridian curve at the optical center of the near vision viewing zone. An angle made by a line normal to the refractive surface from each point of an intersection of an arbitrary plane which is parallel to a plane including the principal meridian curve and the refractive surface of the lens and a plane including the principal meridian curve is constant in the far vision viewing zone and in the near vision viewing zone.

Abstract: A wire dot printer having a plurality of ink applicators for separately applying inks of different colors to the ends of printing wires disposed in separate groups in the ink applicators. The ink applicators are supplied respectively with inks of different colors for effecting multicolor printing on a recording paper. The wire groups are separately housed in a plurality of compartments extending longitudinally of the wires and are separated by partitions. The ends of the wires in each group are arranged in an array. The printer may include a cleaning mechanism for removing deposited paper dust and ink from the distal end of the print head while preventing mixing of ink colors.

Abstract: Liquid crystal display devices including liquid crystal compositions of cyclohexanecarboxylic esters and esters having an acyloxyl group have excellent time-sharing characteristics, low duty ratio and driving voltage.

Abstract: A wraparound support for linearly guiding a slide along a guide bar. The guide bar has upper, lower and side guide surfaces. The support includes bearing members slidably coupled to the upper and lower guide surfaces. The slide is coupled to the bearing unit slidably coupled to the upper guide surface. A carrier member comprises a bottom carrier member, a side carrier member coupled to the bottom carrier member and a biasing member for biasing the carrier member and the slide together. The side carrier member maintains the bottom carrier member and the slide in spaced relation. The bottom carrier member is slidably coupled to the lower guide surface by the bearing units.

Abstract: An ink jet recording apparatus for projecting ink onto a recording medium. The apparatus includes an ink jet head adapted to receive ink having an ejection nozzle for ejecting ink towards said recording medium. An ink tank means stores ink and supplies the stored ink to the ink jet head. A switching mechanism selectively switches between a first condition where the ink tank is in fluid communication with the ink jet head and a second condition where the ink jet head is vented to atmosphere. A nozzle cap selectively covers the ejection nozzle. A suction mechanism creates a suction in the cap. The cap draws ink and air out of the ink jet head through the ejection nozzle to prevent clogging and remove air bubbles from the ink.