Abstract:
An image pickup device having a charge storage target is operated in a first mode whereby scene light discharges photodiodes included in the target structure and an electrical signal corresponding to the scene light impinging on the diodes is derived as a scanning electron beam recharges the diodes. Apparatus is provided for operating the device in a second mode whereby an optical scene image is stored in the insulator portions of the target between the photodiodes and which stored image may be read out subsequently in a nondestructive manner.
Abstract:
A vector generator for use with a cathode-ray tube (CRT) display for forming line segments of a desired length and at a desired angle with respect to a reference. Digital signals from a computer or other source, representative of an incremental change in the coordinates in the line segment to be formed and of the slope of the segment are converted to analog signals and applied to summing amplifiers along with analog signals representative of an initial X and Y coordinate location of a point on the line segment to be formed. The output of the summing amplifiers are analog signals which are coupled to the CRT deflection electrodes such that when the beam is unblanked, the beam will trace a path from the point (X1, Y1) to the point (X1+s Delta Y2), (Y1+ Delta Y2(.
Abstract:
A system is shown for monitoring a direct viewing bistable image storage cathode-ray tube with a cathode-ray monitor tube in which the monitor tube visually displays stored writing when the storage tube is operated in its storage mode and nonstored writing when the tube is operated in a nonstore mode. The nonstored writing is displayed on the screen of the monitor tube with improved intensity and in a manner which insures that the complete image visible on the phosphor of the storage tube is reproduced on the screen of the monitor tube. This is accomplished by providing a circuit which maintains both a readout raster on the storage dielectric of the storage tube target and electron flood guns in operation while at the same time maintaining a potential on the target backplate below that necessary for the storing operation but at a value which causes the nonstored writing to have a controlled persistence lasting for at least the time duration of one frame of the readout raster.
Abstract:
A cathode-ray storage tube is employed for bistably storing a charge image corresponding to input signal information and for providing an electrical readout corresponding to such information. For purposes of electrical readout, the tube''s electron beam is caused to scan, raster fashion, over the stored image. An electrical signal corresponding to the stored image is produced on the storage tube''s target electrode. The input signal applied to the apparatus is sampled at times during the retrace interval of horizontal raster lines, substantially concurrently with the occurrence of the input signal.
Abstract:
A STORGAE TARGET FOR A CATHODE RAY TUBE INCLUDES A GLASS SUPPORT PLATE HAVING A MULTIPLICITY OF DEPRESSION INTO WHICH PHOSPHOR STORAGE DIELECTRIC IS DIFFERENTIALLY DEPOSITED. THE TARGET IS MADE BY IMMERSING THE PLATE IN A VOLATILE LIQUID MEDIUM AND FINE PHOSPHOR PARTICLES ARE DISPERSED IN SUCH MEDIUM IN A MANNER TO PROVIDE TURBULENT MOVEMENT OF THE PHOSPHOR PARTICLES IN THE MEDIUM. THE LIQUID MEDIUM HAS THE PROPERTY, IN COMBINATION WITH THE PHOSPHOR PARTICLES, OF CAUSING THE PHOSPHOR PARTICLES TO ASSUME A CHARGE RELATIVE TO THE MEDIUM SUCH THAT THE PHOSPHOR PARTICLES MOVE TOWARD AND SETTLE IN THE AFOREMENTIONED DEPRESSIONS, WHILE SUBSTANTIALLY AVOIDING A TARGET MESH ELECTRODE OR THE LIKE BETWEEN DEPRESSIONS.
Abstract:
An electron beam head for reproducing magnetically recorded video signals wherein magnetic fields from the record medium are channeled to the interior of the envelope to deflect the primary electrons transversely to the scanning direction of the beam. In one embodiment, the sensing electrodes are at opposite sides of the magnetic field region at an end wall of the envelope, while in another embodiment the primary electron beam passes through the openings in a grid of magnetic wires so as to interact with the magnetic fields therebetween, electrostatic deflecting means serving to deflect the electron beam through a substantial angle as it leaves the grid so as to impinge on sensing electrodes remote from the grid. In a third embodiment, secondary electrons are conducted into a branch tube extending from the main envelope and a single electrode senses the degree of deflection of the secondary electrons by the magnetic fields permeating the secondary emission region.
Abstract:
1,250,023. Electroluminescence. XEROX CORP. 19 Dec., 1968 [20 Dec., 1967], No. 60364/68. Heading C4S. A solid state storage device comprises a plurality of insulated electrodes 30 on a substrate 24 with overlying layers of electroluminescent and field effect semi-conductor material 32, 34 and means for extinguishing luminescence including a transparent dielectric layer 36 and a conductor 38 connected to a potential source. A flat storage panel comprises a plurality of wires coated with an insulating resin (not shown) part of which is removed. The wires are etched to form recesses within the resin coating which are filled with e.l. material. The wires are attached to the substrate by adhesive 26, 28 and adjacent ones connected to opposite sides of a power supply. Layer 36 and a transparent conductor 38 are bonded to layer 34 using acrylic-epoxy or rubber adhesive. Applying a potential to conductor 38 raises the resistance of the f.e.s.c. layer and extinguishes the entire panel. The substrate may be in the form of a drum and layer 38 is replaced by a conductive roller. Information is placed on the drum by optical, electrographic or impact printing means at one station, read out at a station 180 degrees around the drum and erased by the roller a further 90 degrees around the drum. The substrate is of Al, glass or plastics material; the wires of Cu, Ag, Pt, brass or steel; the e.l. material of ZnS or CuCl 2 and ZnS:Mg in an epoxy binder; the f.e.s.c. material of ZnO, ZnO:Zn mixture, CdS, CdO, CdSe, Si, Ge, ZnS or PbO; the dielectric of acetate or polyvinyl fluoride. Conductor 38 may be Au coated on both sides with Al or Cr with on one side further coatings of a polyester and antirefleotive MgF. Alternatively it may be conductive polyvinylbenzyl trimethyl NH 4 Cl plasticized with ethylene glycol.