Abstract: A low cost tooling replication technique for producing glass pressing tools capable of producing precision complex optical surfaces is disclosed. A master glass pressing tool surface is first passivated and plated with nickel or other suitable material to a thickness sufficient to give the plated material some mechanical strength. The plated material is separated from the master glass pressing tool surface to reveal a negative of the master glass pressing tool surface. This negative surface is passivated and plated with nickel or other suitable material to a thickness sufficient to give the plated material some mechanical strength. The plated material is separated from the negative surface to reveal a replica of the master glass pressing tool surface. A plurality of platings may be made on the negative surface to produce a plurality of replicated master glass pressing surfaces. The replicated master glass pressing surfaces are provided with a backer.

Abstract: An imaging system for focusing and deflecting an electron beam comprises, as in prior systems, an evacuated envelope structure having a longitudinal axis and a solenoid for generating a substantially uniform magnetic field within the envelope and along the longitudinal axis thereof. As in prior systems of this type, the envelope includes an electrostatic yoke therein for generating a variable substantially uniform electric field within the envelope to deflect the electron beam along two coordinates of the system. The electric field is orthogonal to the magnetic field. An electron gun within the envelope generates and directs the electron beam through the magnetic and electric field to a target located opposite the electron gun and in a plane perpendicular to the axis of the tube. Unlike prior systems, the electrostatic yoke of the present system comprises a first conductive layer bonded to the interior surface of the envelope, and a second conductive layer overlying the first conductive layer.

Abstract: The present imaging system, like prior imaging systems, includes an electron tube and an external solenoid which is disposed around a portion of the tube. An electron gun within the tube has a plurality of support beads located substantially symmetrically around the gun. Each of the beads comprises a body of insulating material having a first major surface and an oppositely disposed second major surface. A recess is formed in the first major surface and extends into the body of the material. A plurality of connectors corresponding to the number of supports beads are also provided. Each of the connectors comprises a single piece of metal having a proximal end, a distal end and a central body interconnecting both ends. The proximal end of each connector includes an embossment which conforms to the curvature of the leads which extend through a stem assembly of the tube.

Abstract: An imaging device such as a silicon vidicon has a wafer of single crystal semiconductor material having an input sensing region and a charge storage region. A potential barrier is included within the input sensing region for controlling blooming. A passivation region is also included within the input sensing region to stabilize the atomic energy level along a first surface of the wafer. An anti-reflection layer of zinc sulfide and an anti-reflection layer of magnesium fluoride or Cryolite are sequentially deposited on the first surface of the wafer. The two anti-reflection layers form an anti-reflection region which enhances the quantum efficiency of the device in the wavelength range of 400 to 500 nanometers. Each of the layers has an optical thickness substantially equal to a quarter of the wavelength of light incident on the device. A method of forming the anti-reflection region is also disclosed.

Abstract: An intensified charge-coupled image sensor comprises an image intensifier section and a header assembly. The header assembly includes a charge coupled device and an insulative header for retaining the charge-coupled device. An imaging aperture having a sidewall is formed in the insulative header. The imaging aperture is disposed about an optical axis of the image sensor. A conductive layer for preventing electrostatic charge buildup resulting from the impingement of photoelectrons emitted from a photoemissive cathode is provided on a first major surface of the header and on the sidewall bordering the imaging aperture. The header includes an electrode surface having a plurality of discrete contact pads thereon. A header input member has a substantially rectangular portion attached to a first major surface of the insulative header and an annular portion attached to the image intensifier section of the image sensor.

Abstract: An image display including a viewing screen comprising spaced elemental image areas and a light-absorbing matrix of partially-graphitized carbon black adjacent these areas. The matrix may be made by overcoating a stencil and stencil support with an aqueous slurry of the carbon black, drying the overcoating, and then removing the stencil and overlying overcoating.

Abstract: A so-called "solar-blind" photomultiplier tube includes an envelope having a sidewall and an input faceplate formed from an ultraviolet transmitting filter. A photoemissive cathode is disposed within the envelope for providing photoelectrons in response to radiation incident thereon. The cathode has an intrinsic responsivity extending from the near-ultraviolet portion through the visible portion of the electromagnetic spectrum; however, the filter faceplate transmits only the ultraviolet portion of the spectrum to the photoemissive cathode. The combination of the filter faceplate and the photoemissive cathode therefore limits the tube to a responsivity within the wavelength range of about 300 to less than 400 nanometers.

Abstract: Improved signal modulating circuits for a light valve projector are disclosed which are capable of increasing the magenta efficiency of the projector. The projector has an input bar plate having slots, a deformable light modulating medium and an output bar plate having slots. The control circuits generate a first control signal for red and a second control signal for blue. The light modulating medium is modulated in accordance with the red and blue control signals. The control circuits enhance the magenta modulation of the light modulating medium by generating a third control signal for magenta.A first circuit provides a magenta control signal whenever there is a magenta component which is the result of simultaneous inputs from the red and blue signals. A separate signal level for magenta is derived from the red and blue signals and a separate magenta carrier frequency is used which will cause magenta light to pass through slots in the output bar plate.

Abstract: An imaging device such as a silicon intensifier tube (SIT) has an envelope closed at one end by an input faceplate and at the other end by a camera section which includes a silicon target. A novel appendage processing assembly is in communication with the envelope for forming a photoemissive cathode on an interior surface of the input faceplate. The novel appendage processing assembly includes a conductive tubular sidearm which is attached to the envelope. A chamber is attached at one end of the sidearm. The chamber is closed at the other end by a stem portion having a plurality of conductive stem leads extending therethrough. A contact spring and a connecting rod are provided within the chamber to electrically connect the sidearm to one of the stem leads. At least one alkali metal vapor source and preferably three alkali vapor sources are disposed within the chamber and connected between two of the stem leads to permit electrical resistance heating of the vapor sources.

Abstract: A method and apparatus for exposing a layer of photoresist on a sheet includes positioning the sheet in a vacuum printing frame comprising a glass photographic printing plate carrying an opaque master pattern of metal or metal oxide on a central area of the printing plate. A light transmissive rubbery material is patterned in such a fashion as to overlie the opaque portions of the master pattern and provide a continuous path between the islands overlying the opaque master pattern. The rubbery material also extends in the peripheral area of the photographic printing plate and a plurality of mesas separated by channels are formed in this peripheral area. The channels have a width substantially greater than the path width formed between adjacent islands of rubbery material overlying the opaque portions of the pattern. The peripheral channels facilitate the evacuation of the plate and reduce evacuation time.

Abstract: In a method of manufacturing, the steps of: providing a workpiece comprising a main body and a machine-readable marking on a portion of the body, depositing on the marking and the surrounding surface an overcoating of a liquid polymeric composition that is curable by exposure to ultraviolet radiation, and then irradiating the liquid overcoating with ultraviolet radiation so that the overcoating cures to a solid nontacky, light-transmitting protective coating. The workpiece, with the cured protective coating thereon, may be subjected to processing steps wherein extraneous matter may adhere to the coating, and then be cleaned leaving the cured coating intact.

Abstract: A pickup tube includes a generally cylindrical envelope having an input window at one end of the envelope and a radiation sensitive target adjacent to the input window. An electron gun is mounted in the other end of the envelope for generating an electron beam which is incident on the target. A mesh assembly is spaced from the target and in proximity therewith. The mesh assembly comprises a mesh electrode disposed between a mesh support ring and a novel mesh retaining ring. The novel mesh retaining ring has a mesh contact portion and a peripheral skirt portion which is disposed substantially orthogonally to the mesh contact portion. The skirt portion is directed toward the target for modifying the electrostatic field between the mesh electrode and the target so as to reduce beam landing error on the target and to prevent electrons, which are reflected from the target, from landing on the mesh retaining ring.

Abstract: A method for exposing a layer of photoresist on a sheet includes positioning the sheet in a vacuum printing frame comprising a glass plate carrying an opaque master pattern of metal or metal oxide. With the pattern opposite the coating, the frame is evacuated and the layer is exposed. The pattern has a substantially-uniform thickness in the range of about 0.5.+-.0.2 micrometer. To reduce the times for evacuating and devacuating the frame, the pattern side of the glass plate carries an array of light-transparent islands up to about 3.0-micrometer thick. An overcoating of wax on the islands is a further aid.

Abstract: A magnetron includes an evacuated envelope having an output dome insulator affixed to a conductive annular output support ring. The output support ring has a substantially flat support surface adjacent to the output dome insulator and a step-like peripheral sidewall which includes a first portion and an outwardly extending second portion. A weld flange circumscribes the output support ring and is attached to the second portion of the peripheral sidewall. A conductive annular radio frequency gasket is disposed on the flat support surface of the output support ring. The structure is improved by the inclusion of a plurality of gasket retainers disposed around the periphery of the r.f. gasket. Each of the gasket retainers comprises a continuous elongated strip of substantially flat resilient material bent to form a substantially V-shaped envelope engaging portion.

Abstract: An improved color picture tube according to the invention includes a faceplate panel having a cathodoluminescent screen thereon. A low expansion color-selection electrode is mounted in the faceplate panel by a support structure including a bimetal element. The support structure is responsive to changes in temperature of the faceplate panel and moves the color selection electrode relative to the screen.

Abstract: Method comprises positioning a transparent safety panel in close spaced-apart relationship with the viewing window of a CRT and producing a mechanically-strong, hydraulically-tight closure between the panel and window around the margins thereof. The cell formed thereby is filled with curable liquid resin with the window and panel in an essentially vertical orientation. After bubbles have cleared and inspection completed, the liquid resin filling the cell is cured to an optically-clear solid.

Abstract: A method for exposing a layer of photoresist on a sheet includes positioning the sheet in a vacuum printing frame comprising a glass plate carrying an opaque master pattern of metal or metal oxide. With the pattern opposite the coating, the frame is evacuated and the layer is exposed. The pattern has a substantially-uniform thickness in the range of about 0.5.+-.0.2 micrometer. To reduce the times for evacuating and devacuating the frame, the pattern side of the glass plate carries an array of light-transparent islands up to about 3.0-micrometer thick. An overcoating of wax on the islands is a further aid.

Abstract: An electron discharge device, such as a photomultiplier tube, has an evacuated envelope with an alkali-antimonide photoemissive cathode therein. A thermionic emission-reduction coating is disposed within the envelope. The coating alloys with the constituents of the photoemissive cathode to reduce thermionic emission. The thermionic emission reduction coating is formed preferably of indium; however, indium oxide may also be used.

Abstract: The novel CRT includes a color-selection structure which comprises a first electrode having a plurality of column and row elements forming a plurality of apertures, and a second electrode including an array of conductors electrically insulated from the first electrode. The plurality of apertures in the first electrode comprise alternate columns of first and second apertures. The first apertures have a width less than the width of the second apertures which are intersected by the conductors of the second electrodes to form first and second windows. The CRT also includes a viewing screen comprising an array of substantially parallel phosphor stripes of three different emission colors arranged in cyclic order in adjacent triads. Each of the triads of phosphor stripes is associated with a column of first and second windows and a column of first apertures.

Abstract: The novel method comprises (a) producing on one surface of a metal plate an array of substantially-parallel ridges, at least the tops of the ridges being electrically insulating, (b) producing an array of generally rectangular-shaped apertures through the plate in columns between the ridges and (c) producing electrically-conducting strips on the tops of the ridges.