摘要:
A magnetically actuated ink jet printing device for use in an ink jet printer ejects ink droplets by deforming a diaphragm with the force generated on an electrode in a magnetic field when an electric current pulse is applied thereto. In one embodiment, the diaphragm of the device is provided by anisotropically etching a silicon substrate with an etch stop which provides a thin membrane of silicon material for use as the diaphragm. An electrode having an input and output terminal is patterned over the diaphragm and a sacrificial layer is deposited over the silicon substrate surface containing the diaphragm. The sacrificial layer is patterned to subsequently provide the ink ejection chamber over the diaphragm. A patternable layer is deposited over the silicon substrate surface including the sacrificial layer and patterned to provide the nozzles and expose the electrode terminals. The sacrificial layer is removed and an ink supply is connected to the space previously occupied by the sacrificial layer. Magnetic field generating means having a predetermined magnetic field strength are placed adjacent the device, and electric current applied to the electrode terminals in a predetermined direction relative to the magnetic field produces a force necessary to deform the diaphragm and eject an ink droplet from the nozzles of the printing device.
摘要:
An electrostatic recording medium includes a charge retentive layer located on a conductive substrate. An image recording surface on the charge retentive layer includes an array of discrete, conductive segments present in the image recording surface. A multiple electrode assembly having an array of recording electrode tips may be aligned for engagement with the image recording surface. Relative movement between the recording head and the electrostatic recording medium may be provided in such a manner that certain members of the recording electrode tips momentarily achieve Ohmic contact with respective elements of the discrete conductive segments present in the image recording surface. A latent image may be created in the electrostatic recording medium as the charge retentive layer receives an imagewise pattern of localized, discrete charges according to a variable voltage potential present at the tips of the recording electrode during the respective moments of Ohmic contact. The electrostatic latent image may then be made visible by operation of a developer station.
摘要:
A raster output scanner in which both the start-of-scan and the beam intensity of a laser beam are determined using a single photodetector. The raster output scanner has a laser source for generating a laser beam; a rotating polygon for sweeping the laser beam along a scan line plane, an optical fiber with a light receiving end positioned at a known position in the scan line plane and which intercepts at least a portion of the sweeping laser beam, and a photodetector for converting the intercepted laser beam into a beam current. The raster output scanner further includes both a scan detection circuit for producing a star-of-scan signal from the beam current and a beam intensity circuit for producing an electrical output which depends upon the magnitude of the beam current.
摘要:
An imaging system having a raster output scanner that produces high quality scan lines comprised of evenly spaced pixels. The raster output laser device is modulated in accordance with a variable frequency pixel clock that is derived from a high frequency oscillator using a dual modulus programmable divider that is controlled by a state machine. In turn, that state machine is controlled by information stored in a memory. The variable frequency pixel clock compensates for scan line nonlinearity, polygon facet errors, and/or scan line magnification.
摘要:
A scanner adapted to selectively discharge a charged photosensitive surface emits a plurality of light beams, with the plurality of light beams impinging on the charged photosensitive surface forming a composite light spot to discharge the charge thereon. The intensity of at least one of the plurality of light beams may be varied to adjust the position of the composite spot centroid on the charged photosensitive surface.
摘要:
A belt steering roller mechanism for active steering correction of an endless belt, including a shaft having a longitudinal axis and a deformable roller having a fore end and an aft end and a predetermined diameter. The roller is rotatable about the shaft and has a body including a plurality of longitudinally extending rigid members located near the outer diameter of the roll separated by a plurality of longitudinally extending deformable sections. The body may be elastomeric or may be rigid with flexible hinges to provide differential lateral velocity of an outer circumferential surface of the roller. At least one flange plate is located against one of the fore end and aft end and is flexibly held on the shaft by a flexible coupling. Upon a corrective force being applied to the flange plate by an articulating mechanism, the longitudinally extending rigid members are laterally displaced in a cyclic fashion by the flange plate. The outer surface of the steering roller may be textured or coated with a thin sleeve of high friction coefficient material to aid in controlling the belt.
摘要:
A distributed resistance corona generating device includes an insulating substrate, a resistive material layer deposited on the substrate to a uniform thickness, and a plasma gap separating the resistive material layer into at least two resistive material regions. A voltage is applied to the resistive material regions through electrodes arranged on the resistive material regions so that a uniform resistance is provided between the power supply and the points on the resistive material regions immediately adjacent to the plasma gap. The distributed resistance corona generating device is inherently self regulating to provide a uniform charging potential along the plasma gap.
摘要:
A vacuum fluorescent printing device is disclosed having cathode filaments, at least one multiplexed control grid and a skewed matrix of addressable phosphor elements configured on an anode in such a fashion as to enable convenient electrical connection plus imagewise recombination of emitted light from said phosphor elements into a high resolution linear array for the purpose of directing this collection of addressable points of light onto a single line of a photoreceptor drum or belt thereby enabling a xerographic image to be generated. A fly's-eye lens is employed as a light coupling means with the printing device.
摘要:
A vacuum fluorescent printing device is disclosed having cathode filaments, a plurality of multiplexed control grids and a skewed matrix of addressable phosphor elements configured on an anode in such a fashion as to enable convenient electrical connection plus imagewise recombination of emitted light from said phosphor elements into a high resolution array for the purpose of directing this collection of addressable points of light onto a single line of a photoreceptor drum or belt thereby enabling a xerographic image to be generated. An equipotential screen grid is located between one of said plurality of grids and the anode in order to reduce voltage swings needed for cutoff of either grid for phosphor addressing purposes.
摘要:
A development system is which includes a developer roll with a magnetic sleeve. The sleeve has a static magnetic field pattern for transporting developer material to a development zone; and a magnetic system for generating a superimposed alternating magnetic field to agitate developer material in the development zone in order to produce a charged toner cloud intended for the non-interactive development of latent electrostatic images.