Abstract: Permanent magnetic recordings are made by orienting the magnetic particles f a polymerizable ink in a first direction, then selectively polymerizing the ink to fix some of the particles in the first direction. The remaining particles are then oriented in a second direction and the previously unpolymerized portions of the ink are polymerized, while the ink is kept in a magnetic field tending to orient the particles in the second direction to prevent the particles fixed in the first direction from blurring the magnetic pattern before the polymerization is effective to lock it in completely. Such recordings are particularly useful for ID cards.

Abstract: A kit for servicing the interior working parts of a cartridge type tape playback unit comprising a completely hollow cartridge case having parallel track guide means disposed in its two sides. The hollow cartridge case is designed to actuate the unit when it is inserted in the unit and provide the user of the kit with an unobstructed view of the playback head, the capstan and the sensing poles as well as other similarly disposed interior working parts over which the tape would normally travel. A tool holder having a plurality of interchangeable service heads is provided. Two of the heads, one of abrasive material and the other of felt or the like, are formed with a concave cleaning surface and are dimensioned so as to be received between the guides in the side walls of the cartridge case. Another cleaning head includes cutter blades and a magnet and is also sized so as to be received within the guides.

Abstract: An automatic switching device for a cassette tape recorder is provided which includes a detecting member disposed within the tape recorder for cooperation with at least one detection opening provided in a tape cassette so as to indicate the variety of a magnetic tape internally housed therein, thereby establishing an optimum bias and/or an optimum tape speed for the tape recorder.

Abstract: In a high resolution electroerosion printer, a print head comprises a print head body of plastic or glass in which are embedded closely spaced glass tubes. The glass tubes provide low friction passageways for fine wire electrodes which extend through the glass tubes protruding beyond the print head body to be in uninterrupted flexible contact with the metal layer of a record medium. A pair of feed rolls frictionally engage the individual wires such that when the feed rolls are operated they can adjust the position of the wires to compensate for wear of the ends thereof in contact with the metal layer.

Abstract: A power limiting circuit for controlling recording electrode energizing power in an electrographic recorder having a plurality of electrographic recording electrodes has a voltage and current monitor circuit for detecting the changes in voltage and current being supplied to electrographic recording electrodes. The monitor circuit is used to maintain the current and voltage levels at predetermined reference levels by inhibiting the firing of preselected ones of the recording electrodes in a first and a second inhibit mode of operation. In the first inhibit mode, the firing of the even numbered electrodes is inhibited to maintain the predetermined power levels being supplied to the recording electrodes. The inhibiting operation is extended in the second inhibit mode to inhibit the odd numbered electrodes as well as the even numbered electrodes in alternate recording lines for a further limiting of electrode energization power to the recording head.

Abstract: An arrangement for the electrical control of the keyboard of a video or audio tape recorder includes electromechanical levers acting on the usual rod system associated with the keyboard in substitution of the conventional keys. The levers are essentially bellcranks and are associated with tumblers and electromagnets.

Abstract: In the electric recording process comprising relatively moving a pair of a recording electrode and a counter electrode and an electrostatic recording material electrically connected between said two electrodes, applying an electric recording signal between said two electrodes to form an electrostatic image on the electrostatic recording material, developing the so formed electrostatic image with a developer and, if desired, fixing the developed image, when a high frequency signal formed by amplifying and modulating an image signal is applied as the electric recording signal and the electrostatic image formed on the electrostatic recording material is developed with an electroconductive powdery developer containing a fine powder of a magnetic material, high quality recorded images free of such troubles as blurring, tailing, fogging and Moire can be obtained even at high recording speeds.

Abstract: Generation of charged particles, e.g. ions, by extracting them from a high density source provided by an electrical gas breakdown in an electric field between two conducting electrodes separated by an insulator. When a high frequency electric field is applied, surprisingly high ion current densities can be obtained, providing numerous advantages over conventional ion forming techniques for use in electrostatic printing and office copying, as well as in electrostatic discharging, precipitation, separation, and coating.

Abstract: A writing head overlying a recording medium, in the form of a sheet with edges respectively extending in mutually orthogonal directions X and Y, carries a linear array of equispaced electrodes extending in the X direction over a fraction of the width of the sheet. The writing head is displaceable in the Y direction along a supporting bar which in turn may be moved in the X direction. A control unit commands the selective energization of these electrodes to record a dot pattern as the writing head moves in the Y direction to sweep a column of dot positions, the column being wide enough to accommodate several alphanumerical characters and/or graphic symbols read out on a line-by-line basis from a plurality of memory sections. With at least one additional linear electrode array on the writing head, generally transverse to the X direction, heavy lines or curves may be traced on the recording medium.

Abstract: The invention comprises a channel repeat attachment for a tape unit of the type comprising a housing having an opening therethrough for receipt of the channel-change electrodes of a playback device, and a multi-channel tape mounted in the housing for movement past the opening, the tape having a channel-change key portion thereon. The attachment comprises a shield adapted to be disposed in an operative position in alignment with the opening and overlying the tape to separate the tape from the channel-change electrodes, and a connection portion adjoined to the shield for removably securing the attachment to the housing with the shield in its operative position.

Abstract: In the electrostatic recording process comprising relatively scanning a recording electrode on an electrostatic recording material which is electrically connected between said recording electrode and a counter electrode, applying a high frequency alternating current or asymmetric alternating recording signal formed by amplifying and modulating an image signal by a high frequency carrier wave between said two electrodes to form an electrostatic image on the electrostatic recording material, developing the so formed electrostatic image with a developer and, if desired, fixing the developed image, when a specific dielectric layer is selected to the kind of the recording signal and the electrostatic image formed on the dielectric layer is developed with an electroconductive powdery developer containing a fine powder of a magnetic material, high quality recorded images free of such problems as blurring, tailing, fogging and Moire can be obtained a high recording efficiency.

Abstract: A cassette tape holder for use in a tape recorder is rotated between an inoperative position on the outside of a cabinet at which a cassette tape is loaded and unloaded and an operative position on the inside of the cabinet through an opening thereof. A lid for closing the opening is slidably mounted on the holder and when the holder is rotated to the inoperative position the lid is moved to a position not to interfere with the loading and unloading of the cassette tape.

Abstract: In the electrostatic recording process comprising relatively scanning a recording electrode on an electrostatic recording material electrically connected between said recording electrode and a counter electrode, applying a high frequency alternating current or asymmetric alternating current recording signal formed by amplifying and modulating an image signal by a high frequency carrier wave between said two electrodes to form an electrostatic image on the electrostatic recording material, developing the so formed electrostatic image with a developer and, if desired, fixing the developed image, when an electrostatic recording material including an electroconductive substrate having a specific multi-layer distribution structure is used and if a dielectric layer is disposed on this electroconductive substrate in a specific arrangement selected according to the kind of the recording signal to be applied, such problems as blurring, tailing and fogging can be effectively eliminated and recorded images excellent in

Abstract: Electrographic paper is fed over a segmented platen where its dielectric surface receives image defining electrostatic charges deposited by styli bearing directly and successively upon it. The styli are integral to an endless belt moving laterally to the surface. Voltage pulses corresponding to the input information are applied to the segmented platen to produce the electrostatic charges. The latent image charged surface is progressively fed to an image toning and fixing cycle to produce a hard copy.

Abstract: A two-color electrostatic printing apparatus capable of producing two-color images printed on a sheet of paper with two colored toners. The apparatus comprises a paper feed mechanism for driving the paper at a predetermined speed, a charging part for selectively forming positive and negative electrostatic latent images on the paper, a developing part for attracting positive-charged and negative-charged two colored toners simultaneously onto the latent images so as to render the latent images visible, and a fixing part for thermally fusing the toners attracted onto the electrostatic latent images.

Abstract: Tracking control apparatus for a signal reproducing system of the type wherein at least one transducer scans successive parallel tracks on a record medium in which information signals, such as video signals, are recorded. The transducer preferably is of the rotary type so that, during its orbit, it is brought into and then out of reproducing relation with respect to the record medium. Any deviation between the scanning trace of the transducer across the medium and a given track which is being scanned is detected, and a control signal is produced as a function of this detected deviation. The transducer is supported by an adjustable support which is responsive to the control signal so as to displace the transducer transversely of the given track by an amount determined by the control signal. A predetermined sample of the control signal is produced while the transducer scans the given track, and this predetermined sample is stored.

Abstract: Apparatus for printing images on paper or other print medium, including a recording head which records magnetic images on a record tape, means for applying magnetically-attracted toner to the images, transports which hold the record tape and paper a small distance apart to leave an air gap of about 4 thousandths inch between them, a pair of electrodes located so that the toner on the record tape and the paper are sandwiched between the electrodes, and a high voltage source which applies a brief pulse of high voltage of a duration on the order of one millisecond between the electrodes, to form an electric field that propels the toner particles across the air gap from the record tape to the paper.

Abstract: The cassette receiving chamber in a cassette tape recorder is constructed on a movable support that can elevate and lower the cassette into and out of the operating position while maintaining the cassette in a stable constant orientation. It is constructed of two substantially identical U-shaped elements that cross legs in shifting the chamber in the fashion of scissors.

Abstract: In a xerographic printer wherein an acousto-optic modulator is used to derive a deflected first order beam of electromagnetic power which raster scans a charged photoconductor to leave a selectively discharged latent image area bordered by a discharged border area; power contents of said first order beam is maintained constant by adjusting the efficiency of the acousto-optic modulator with a closed loop electrical control system. The efficiency of the acousto-optic modulator is adjusted only when the beam is scanning the border area of the photoconductor.

Abstract: A fabric substrate is passed through an electric field in order to set up a charge on the surface of the substrate and to thereby cause a particulate adhesive material stored in a container over which the substrate passes to be attracted to the surface of the substrate by electrostatic attraction. The coated substrate is subsequently heated to melt the adhesive material so that it agglomerates and adheres permanently to the substrate, thus forming a fusible interlining.