摘要:
A cathode ray tube (CRT) socket provides for improved performance by increasing the creeping distance between high and low voltages associated with a correspondingly connected CRT. The CRT socket includes a socket body with a cylindrical central hole extending through its front and rear faces, signal connecting means arranged on a concentric circle about the cylindrical central hole, the signal connecting means engaging with signal terminals from the CRT, and an insulating cover portion arranged on the same concentric circle as the signal connecting means, the insulating cover portion having a high voltage connecting means for engaging with a focusing terminal of the CRT. The signal connecting means is constructed by forming a recessed signal contact portion in the front face of the socket. A plurality of signal contact holes are formed in the recessed signal contact portion of the front face. Each of the plurality of signal contact holes are spaced apart at a predetermined interval. The high voltage connecting means includes a recessed high voltage contact portion which is formed by recessing a front face portion of the socket and a high voltage contact hole formed on the recessed face. The holes formed in the recessed portions of the high voltage connecting means and the signal connecting means engage the terminals on the neck of the CRT. The recessed signal contact portion and the recessed high voltage contact portion are separated from each other by a groove portion which extends to the front and rear faces of the socket body. Creeping distance is increased by separating the high and low voltage (signal) portions of the socket by the groove portion.
摘要:
A head for discharging yellow ink, magenta ink, cyan ink and first black ink having a relatively fast penetration velocity to a recording medium and a head for discharging second black ink having a relatively low penetration velocity are used to print an image. When a black image is adjacent to a color image, the black image is formed by using the first black ink, and when the black image is not adjacent to the color image, the black image is formed by using the second black ink. A black ink and a plurality of color inks having a different penetration velocity to a recording medium than that of the black ink are also used to print an image. Whether a color image area is present in the vicinity of a black image area of record data or not is determined, and whether the black image area is to be formed by the black ink or by the color inks is decided in accordance with the determination result, and when the black image is to be formed by the color inks, the color inks are used based on a mask pattern pseudo-randomly prepared to make the change in tonality less recognizable.
摘要:
An ink jet recording apparatus comprises a recording head having discharge ports to discharge ink; an ink tank containing ink to be supplied to the recording head; and means for performing predischarges to stabilize ink discharges from the recording head. In this apparatus, the recording head is provided with a discharge unit to discharge plural kinds of ink, and the means for performing predischarges operates predischarges from all the discharge ports, only from the discharges ports in the vicinity of each end of the discharging units, and from all the discharge ports in that order at least for predischarges from discharging unit having relatively thin ink. With such head and means for performing predischarges, it is possible to remove mixed ink after suction recovery with a lesser amount of ink consumption, and execute a high quality recording stably at all times.
摘要:
Random masks each having a given size and defining a random array of non-record pixel locations and record pixel locations are placed in association with record areas in mask registers. Using the placed masks, record data is thinned-out and supplied to a recording head. An image is then recorded. Thus, since thinning-out masks do not have periodicity, any inherent density nonuniformity loses periodicity. Consequently, high-definition images can be produced.
摘要:
A fixing apparatus for fixing an image on a record sheet .�.comprises.!. .Iadd.includes .Iaddend.a fixing roller in which a heater is disposed, a pressing roller urged against the fixing roller, heat pipes extending in either one of the fixing and pressing rollers in a longitudinal direction thereof, and a temperature detection/control device for detecting .�.to control.!. .Iadd.and controlling .Iaddend.a temperature of the fixing roller. In a typical embodiment, the heat pipes are disposed in the fixing roller to extend both through .�.an imaging portion.!. .Iadd.a sheet passage area.Iaddend., through which a record sheet passes, and through a .�.non-imaging portion.!. .Iadd.sheet non-passage area.Iaddend., through which no record sheet passes and the temperature detection/control device has a temperature detection device for detecting a temperature of the fixing roller in contact with the .�.non-imaging portion.!. .Iadd.sheet non-passage area.Iaddend.. The temperature detection/control device is provided with a temperature regulating device for interrupting electricity to the heater when the fixing roller exceeds a predetermined temperature. In another embodiment, at least one of .Iadd.the .Iaddend.heat pipes is provided in the fixing roller in parallel with an axis of the fixing roller, and a core of the fixing roller is produced by extrusion.
摘要:
Random masks each having a given size and defining a random array of non-record pixel locations and record pixel locations are placed in association with record areas in mask registers. Using the placed masks, record data is thinned-out and supplied to a recording head. An image is then recorded. Thus, since thinning-out masks do not have periodicity, any inherent density nonuniformity loses periodicity. Consequently, high-definition images can be produced.
摘要:
In image recording by discharging plural inks of different characteristics onto a recording medium, recording pixels to be recorded by at least one of the inks of either yellow, magenta or cyan color subjected to pixel expansion are expanded in four direction, then a logic product is calculated between the expanded pixels and the pixels to be recorded with an ink which is black not subjected to pixel expansion, and the recording pixels to be recorded by the ink which is black not subjected to pixel expansion are replaced by the pixels formed by the inks (Y, M, C) subjected to pixel expansion. Thus high-quality image recording is made possible even in case the inks of different properties are brought into mutual contact.
摘要:
A recording head having an ejection portion group for ejecting a black ink, and ejection portion groups for ejecting color inks is used. When a black image to be printed by the black ink is present adjacent to a color image to be printed by the color ink, a black image portion adjacent to the color image and a black image portion which is not adjacent to the color image are formed in different scans, thereby obtaining a high-quality image from which ink blurring at a boundary portion between the black and color images is eliminated.
摘要:
An ink is ejected at the same timing from ejection orifices in a number corresponding to an ink quantity 7% or less of an ink quantity ejected from all the ejection enabled ejection orifices of a plurality of ejection orifices of a recording head, and the ink ejection period from all the ejection enabled ejection orifices is set to be 70% or more of the driving period. Since the quantity of an ink ejected per unit time is minimized, and the negative pressure level generated in a common ink chamber can be set to be closest to normal pressure, the amplitude of a refill oscillation is minimized to stabilize ejection, and the driving frequency can be further increased.
摘要:
A fixing apparatus installed in an image forming apparatus and having a pair of rollers engaged with each other for fusing and fixing toner images to a paper. Pivotable sheet separator pawls are resiliently engageable at their free ends with the periphery of one of the said rollers for separating from the periphery of the roller a leading end portion of the paper coming out of a nipping section of the rollers with the fixed toner images. The sheet separator pawls moves in parallel with the direction of axes of said rollers while said rollers stop.