Abstract:
A pair of electrodes (I, Io) perform both input and keep-alive functions in a plasma charge transfer device (30). The input-keep alive electrodes (I, Io) are formed on opposite walls (16) of the device adjacent an array of transfer electrodes (14) and are capacitively coupled to the ionization gas. Repetitive and selective voltage pulses are multiplexed to the input-keep alive electrodes (I, Io) and synchronized with transfer electrodes pulsing, to provide, respectively, a keep-alive function and the selective input of data to the charge transfer device (30). A pair of erase electrodes (E, Eo) may also be capacitively coupled to the gas. A pulsing technique is described for restoring charge neutrality to the input-keep alive electrodes (I, Io) and erase electrodes (E, Eo) after each input or erase function.
Abstract:
A read-only memory includes an array of field effect transistors (111, 112, ..., mk). Each field effect transistor has a channel width selected from 2 s possible widths (n > 1) to provide one of 2 s possible output voltages upon sensing. The output voltage is applied to a set of 2 s - 1 sense amplifiers, each of which is selectively activated at a separate one of 2 s - 1 voltage levels intermediate two adjacent values of the 2 s output voltages. The sense amplifier outputs drive a logic circuit (104) providing n binary outputs, one of which may be selected by a decoder (105).
Abstract:
Holographic scanning system for scanning a bar code in which the scan pattern includes at least two non-parallel scan lines. In a first embodiment, the light beam (72) of a laser (70) is split into two segments (75, 76), each directed through a plurality of holograms (88) mounted on a single rotating disk (86) for generating a scanning pattern (90) comprising a plurality of intersecting lines on a target area through which passes a label (32) or object bearing a bar code. The light reflected from the bar code is picked up by an optical detector (98) for use in reading the bar code. A second embodiment includes a rotating disk (110) having mounted thereon two semicircular holograms (110, 112) arranged to generate a pattern including two semicircular arcs (116, 118) used in generating a star or multiple X scan pattern on the target area.
Abstract:
An optical data sensing system includes an optical wand (14) adapted to optically sense a record member containing data encoded in a bar code, and a reading circuit (20) for decoding the sense data for transmission to a computer (26). A power source (30) is coupled via a switch (36) to the wand (14) and the reading circuit (20). A control circuit is effective to operate the switch (36) periodically to determine whether the wand (14) is sensing the record medium. When the wand (14) is sensing the coded data, control signals are provided to operate the switch (36) for at least a predetermined time such that the reading circuit (20) can process the sensed data. An economy in power supply is achieved.
Abstract:
A light pen detection system used in a data display system utilizes a cathode ray tube (CRT) in which characters displayed on the screen of the cathode ray tube (20) are detected by the light pen (32), the detection or the character by the light pen (32) resulting in the background inversion or the character sensed thereby providing a visual indication to the operator of the sensed character. A locking circuit (72) is provided which, upon the sensing of a displayed character by the light pen (32), prevents the visual indication of a further character as long as the light pen (32) continues to receive light from the originally sensed character.
Abstract:
In a process for fabricating CMOS devices having polysilicon gate electrodes on a semiconductor substrate (10), a gate oxide layer (16) is provided on the substrate, and doped polysilicon gate electrodes (22) are defined on the gate oxide layer (16) which is then removed from the source and drain regions. A protective layer (32) of silicon dioxide is then applied over the source and drain regions and over the sidewalls (28) of the gate electrodes (22). A first silicon nitride mask (34) is formed leaving exposed a first region (18) which is then subjected to a boron implant to form the sources and drains of the p-channel devices. A second silicon nitride mask (42) is formed over the substrate (10), and a second region (20) of the substrate is then subject of an arsenic implant to form the sources and drains of the n-channel devices. The remaining silicon nitride is removed using a phosphoric acid etchant, the substrate surface being protected during the etching by the silicon oxide protective layer (32).
Abstract:
In a process for forming a CMOS integrated circuit (10) having polysilicon gate electrodes (28, 38) the polysilicon gate electrodes (28, 38) are simultaneously doped with impurities of a single conductivity type, independently of the semiconductor substrate (18). The invention enables the avoidance of the penetration problem which arises when boron is utilized to dope polysilicon. After forming the gate electrodes (28, 38) from a polysilicon layer (128), they are covered by a mask including a silicon oxide layer (130) and a silicon nitride layer (132). Then sources (22, 34) and drains (24, 32) of the n-channel and p-channel transistors (12, 14) are formed and an implantation or diffusion barrier (148) is grown over the sources (22, 34) and drains (24, 32). The mask (130, 132) is removed over the gate electrodes (28, 38) which are then doped with an n-type impurity. Polysilicon resistors (50) may be formed by initially doping the polysilicon layer (128) to a low level of conductivity and protecting the resistor areas (50) by a further mask (138), which may be of polysilicon or silicon nitride, during subsequent doping to a high level of conductivity.
Abstract:
In a holographic scanning system suitable for scanning bar code indicia, a light beam (54) provided by a laser source (20) is directed to a first set of holograms (42, 44, 46) located on a rotating disc (26), each hologram generating an individual scan beam having a slightly different focal length and direction angle from that of the other holograms. The scan beams are projected such that the depth of focus portions (D u) of the projected beams overlap so as to provide an enhanced depth of focus for the scanning operation, thereby alleviating the problem of precisely positioning the object to be scanned, and enabling a more effective scanning operation. The light reflected from the bar code is collected by a second set of holograms (48, 50, 52) on the scanning disc arranged to focus the received light at a collection point (62) on an optical detector.
Abstract:
Appareil de mise en forme d'images pour un affichage visuel (21) pour produire des images multiples, par exemple de cheques bancaires ou, de maniere a soulager la fatigue de l'oeil et a concentrer l'attention du responsable sur des parties critiques de l'affichage, une mise a blanc selective autour des images multiples est effectuee. Un compteur d'adresses (7) envoie des adresses a une memoire qui stocke des donnees d'image pour l'affichage visuel. Des registres reglables (8) sont couples au compteur d'adresses de maniere a inhiber selectivement les adresses de memoire de telle sorte que seules des portions de la memoire contenant des images a afficher sont adressees Un selecteur (1, 20) effectue l'accouplement soit des donnees d'image soit des signaux de blanc a l'affichage sous la commande de registres qui sont regles pour contenir des informations definissant les regions de l'affichage a mettre a blanc.
Abstract:
The deposition and drying out of ink on the front surface of a print head nozzle plate adversely affects the ejection of the ink droplets. The nozzle plate (12) of ink wettable material carries a coating (30) on its front surface on non-wetting material. Such arrangement provides a stable meniscus of the ink column in each nozzle (24) and prevents ink from depositing at the front surface around the nozzle orifice. The principal use is in an ink jet printer.