Abstract: A monochromatic imaging apparatus comprising a pair of similar diffraction gratings, a pair of focusing lenses, a pair of collimating lenses, an entrance slit, an exit slit and an intermediate slit, and means for concurrently moving the two gratings; wherein a polychromatic source image is placed at the entrance slit, and a collimating lens collimates the light rays from the source image and projects the collimated rays onto the first diffraction grating thereby to disperse the rays. The dispersed rays are then focused by the first focusing lens onto the intermediate slit, and then collimated by the second collimating lens onto the second diffraction grating which thereupon recombines the dispersed light. The recombined rays are then focused by the second focusing lens onto the exit slit.

Abstract: An electrical device for use in delaying the time of arrival of an electrical signal with fixed increments of delay in the picosecond range and having a minimum delay time in picoseconds is disclosed. In one embodiment of the invention, the device comprises a plurality of small T shaped RF coaxial connectors fixedly coupled together in series with the connectors themselves serving as delay elements. One of the unconnected (open) ports of the connector at one end of the series is used as the entrance port for the device and the other unconnected ports of the connectors in the series are used as exit ports for the device.

Abstract: A computer network is disclosed in which a plurality of computer work stations are interconnected for interstation communications by a single electrically continuous bi-directional bus. Each computer work station includes a data processing device and a transceiver. The transceiver includes a receiver section for receiving signals transmitted over the bus and a transmitter section for transmitting signals onto the bus. The receiver section is coupled to the input of the data processing device by a first optical isolator and the transmitter section is coupled to the output of the data processing device by a second optical isolator. The data processing device and the first optical isolator are powered by a first power supply which is connected and grounded to the AC mains while the transceiver and second optical isolator are powered by a second power supply which is connected to the neutral conductor on the bus and is floating.

Abstract: Apparatus is disclosed for use in calibrating the time axis and intensity linearity of a streak camera or any optoelectronic device over any one of a number of different time scales. The apparatus includes a plurality of bundles of optical fibers mounted on a rotation wheel and a pulsed light source. Each bundle of optical fibers is made up of a plurality of optical fibers, each cut to a different length with the differences in length between the fibers in any one bundle being uniform and the differences in length of the fibers in one bundle being different from the differences in length of the fibers in each one of the other bundles. The fibers in each bundle are arranged so that one set of ends terminates in a common input plane and the other set of ends terminates in a common output plane.

Abstract: A reinforcement for a corner mounting hole in a sheet of paper is disclosed. The reinforcement comprises a corner shaped pocket member made of paper or other similar material. The pocket includes a front wall and a back wall, each of which is coated on its inside surface with a layer of a moisture activated adhesive. Each wall further includes a hole which is located so as to be in registration with the corner mounting hole in the sheet of paper when the corner shaped pocket member is mounted onto the corner of the sheet. In using the reinforcement, the inside surfaces of the front and back walls are first moistened. The pocket is then slidably mounted onto the corner of the sheet of paper and then fixed in place with the holes in registration with the mounting hole to be reinforced. The reinforcement is especially useful in repairing or reinforcing the corner mounting holes in sheets of computer printout paper.

Abstract: A portable device is disclosed for monitoring the tanning of an individual in a controlled manner over a series of tanning sessions. The device time integrates the exposure to optical radiation and indicates when predetermined dosages of the radiation have been received for the purpose of obtaining a desired tan. The device which makes use of a personalized program in order to achieve a desired tan includes a series of filters, a light detector, an integrator, a programmable computer and an alarm. Light either from the sun or an artificial light source passed by the filter and impinging on the light detector is converted into electrical signals which are time integrated by the integrator and fed into the computer. In the computer the signals are processed with data signals corresponding to the precalculated radiation dosage limit for each one of a plurality of preselected tanning sessions and the calculated total radiation needed to achieve the desired tan.

Abstract: A diagnostic display terminal system for remotely troubleshooting hardware, software and operational malfunctions in a computer over telephone lines includes a user-site diagnostic display terminal assembly and a support-site diagnostic display terminal assembly. Each diagnostic display terminal assembly includes a microprocessor controlled display terminal, a telephone instrument and a split baud rate modem, the modem serving to interface the display terminal and the telephone instrument to a telephone line. The system provides alternate voice and data communication between the user-site and the support-site and permits almost instantaneous change-over between voice and data. The telephone link effectively merges the two display terminals together in that each display terminal can monitor the actions of the other and that each display terminal can run all programs executable at the user-site display terminal.

Abstract: A method and apparatus are disclosed for making a coded chart of a color subject for use in creating a likeness of the subject by needleworking. An image of the subject is formed on a screen. The image is scanned, point by point, with a fiber optic probe and the light received by the probe is measured for color content using a set of phototubes and color filters. The analog output signals from the phototubes are converted into digital signals and fed into a computer where they are processed to determine the proper color needlecraft material to use for each picture element in the subject. Using this information, an image of the subject is produced on the display screen of a computer terminal, with each picture element in the image appearing as a symbol identifying its particular color. In addition, a color reproduction of the subject based on the color signals is generated on a color monitor.

Abstract: A method is disclosed for adjusting a polarizing or interference type video microscope system so as to achieve significant improvement in resolution, contrast, speed of recording, image fidelity and visibility of fine detail, the video microscope system including (1) a polarizing or interference type microscope having an iris diaphragm and a compensator and (2) a video camera having an adjustable gain control circuit and an adjustable DC restoration circuit. The method involves lowering the gain and the clamp level of the DC restoration circuit in the video camera to a minimum, then adjusting the microscope for optimum optical imaging conditions, these conditions including partly closing the iris diaphragm and setting the compensator for .+-. approximately the same bias retardation as the specimin (i.e. .lambda./100-.lambda./50), then opening the diaphragm to the maximal working aperture of the microscope objective and setting the compensator at a bias retardation of around .lambda./9 to .lambda.

Abstract: An apparatus and method are disclosed for testing the faces of a polygon mirror for angular inclination and flatness while the polygon mirror is rotating at its intended operating speed. The apparatus includes an autocollimator for making the test readings, a strobe light for supplying light in the form of pulses to the autocollimator and a control mechanism including a laser, a light detector, a counter and a momentary contact switch for controlling the timing of the light pulses emitted by the strobe light so that the faces of the polygon mirror can be tested, one face at a time. The apparatus further includes a fiber optic probe which illuminates a unique number imprinted on the face illuminated through the autocollimator with light pulses directly from the strobe light so that the face that is being illuminated can be identified.

Abstract: A phase-locked loop circuit is disclosed for use, for example, in the data recovery system of a rotating magnetic disk drive unit employing a phase encoded signal format. The phase-locked loop circuit has a dual mode of operation wherein captive range is assured by providing a first frequency locking mode of operation wherein a voltage controlled oscillator (VCO) is first locked in frequency to a reference signal and a second phase locking mode of operation wherein the VCO is subsequently locked in phase to an MFM signal independently of the frequency assumed by the latter signal. In addition to the VCO, the phase-locked loop circuit includes a frequency detector, a phase detector, a filter, an amplifier, a pair of frequency dividers, a pulse shaping network and a plurality of switches. A potentiometer is coupled to the input of the amplifier and is used to supply a voltage signal to the amplifier which is sized to offset system phase errors caused by the various components in the phase-locked loop circuit.

Abstract: A phosphorescent escape route indicator having at least one protruding indicia formed within or attached to a sheet of material. The protruding indicia has incorporated therewith a phosphorescent substance capable of emitting a glow in the absence of light. An adhesive formed as part of the sheet is utilized to apply the indicator to the surface of walls or stairways thereby aiding in delineating escape routes or access routes to emergency equipment during time of emergency.

Abstract: A video system having a television camera, a digital video signal processor coupled to the output of the television camera and a television monitor coupled to the output of the digital video signal processor is disclosed.

Abstract: A computer network is disclosed in which a plurality of computer stations are interconnected by a single bus and wherein access to the bus is controlled by the computer stations themselves through an adapter unit at each station. Each adapter unit is assigned a unique number. When the network is running normally, control of the bus is continually passed from one live adapter unit to another in numerical sequence and the bus is active with messages, control signals or status signals from the particular adapter unit that happens to be in control at the time. If, for any reason, there should be no activity on the bus for a preselected time interval, all adapter units detecting this condition enter an election mode to elect from amongst themselves one adapter unit to assume control and resume activity. In the election mode, each participating adapter unit sends a pulse out over the bus and then monitors the bus for activity for a time period directly proportional to its assigned number.

Abstract: A method and apparatus for monitoring the resonant frequency and absorption level at resonance of an absorption type resonant cavity which involves providing a voltage controlled oscillator, applying to the control input of the voltage controlled oscillator a control signal having a main component V.sub.m and a dither component V.sub.d, splitting the output signal from the voltage controlled oscillator into a portion directed along a test path and a portion directed along a reference path, the reference path including an attenuator controlled by a voltage signal V.sub.k, directing the signal in the test path through the resonant cavity, splitting the signal emerging from the resonant cavity into a portion directed along a frequency detection path and a portion directed along a level detecting path, using the signal directed along the frequency detection path for generating a signal for changing the amplitude of V.sub.

Abstract: A method and apparatus for detecting and measuring the number and sizes of impurities on the surface of a material, such as a semiconductor wafer, wherein high intensity collimated light is directed onto the surface, in the absence of any extraneous light, through a collimating mirror, and employing a point source, whereat the particles will scatter the light, and wherein the surface is viewed by a highly light sensitive TV camera which picks up the scattered light and displays same on a viewing screen. The intensity of scattered light will indicate the size of the particles when compared with a calibrated model. Advantageously, a broad range of light waves is employed and thus enables a range of sizes of particles to be detected by the light scattered thereby. Also, advantageously, with the use of ordinarily available equipment, the system can inspect wafer surfaces for particles having sizes as small as 0.3 microns.

Abstract: Apparatus for monitoring and/or controlling the operations of a computer at a user site from a support center over a telephone line, the computer at the user site including a central processing unit (CPU) and a display terminal. The apparatus includes a telephone instrument at each location connected to the telephone line, a display terminal connected to an acoustic coupler at the support center and a control and switching device at the user site connected to the CPU, to the display terminal at the user site and to an acoustic coupler. When a link is established between the acoustic coupler at the support center and the acoustic coupler at the user site over the telephone line, the display terminal at the support center is operable with the display terminal at the user site in either an on-line mode or a conversational mode. In the on-line mode, either display terminal can input to the CPU and the output from the CPU is displayed at both display terminals.

Abstract: A controller for interfacing a central processor unit (CPU) to a peripheral storage device which can be tested for proper operation independent of the peripheral storage device includes a sequencer, a buffer, a microprocessor and various error detection logic. A gate is coupled between the sequencer and the input of the peripheral storage device for enabling or disabling the transfer of data from the sequencer to the peripheral storage device and a multiplexer is coupled between the microprocessor, the output of the peripheral storage device and the sequencer for selecting inputs to the sequencer from either the microprocessor or the peripheral storage device. During a normal write operation, write signals are sent from the CPU to the sequencer through the buffer and then from the sequencer to the peripheral storage device through the gate.

Abstract: A laser recording system is disclosed in which a beam of light from a laser is split into first and second beams. The first beam is modulated with digital signals from a computer and deflected by a rotating mirror onto the surface of a photoconductive drum. The second beam is deflected by the rotating mirror onto a curved timing plate. The surface of the timing plate is provided with a series of unevenly spaced reflective markings representative of evenly spaced spot positions on the surface of the drum. Light reflected by the timing plate as the second beam scans its surface and strikes the reflective markings impinges on a photodetector located at the center of curvature of the timing plate and is converted by the photodetector into a corresponding series of electrical signals.