Abstract: In a duplicator, a reflected light from a document or an original copy is converted into an electrical video signal by an image pickup element, and the electrical video signal is supplied to a magnetic recording head to form a magnetic latent image on a magnetic recording drum, in the latent image forming mode. In the copy mode, the magnetic latent image is developed by a magnetic toner, and the toner picture is transferred onto a recording paper which runs through a paper transport path. The transferred toner picture is fixed on the recording paper, and the remaining toner on the surface of the magnetic recording drum is scraped after the transfer operation. A set value of a copy register is compared with a counting value of a copy counter by a comparator. When the counting value reaches the set value, a copy end signal is generated. With the pushing of a copy switch, a control portion of the duplicator operates, first for the latent image forming mode and then for the copy mode.

Abstract: A storage target includes a dielectric storage medium in the form of a relatively rigid sheet of insulating material having high density, such as a single crystal sheet of sapphire. A film electrode is formed, as by vapor deposition of nickel or like conductive material, on one of the surfaces of the storage medium. An array of openings are defined by and extend through the storage medium and film electrode. In some embodiments the collector electrode of a direct-view storage tube is formed on the other surface of the storage medium, also as by vapor deposition of nickel and subsequent etching.

Abstract: Disclosed is an improved electrophotographic copying machine in which a black frame eliminating mechanism and a random cutting assembly adapted to cut a roll of photosensitive paper to a required length are incorporated. The black frame eliminating mechanism comprises an original supporting window, the length of which is longer than that of an original, an original depressing plate having a white surface facing and covering over the supporting window, means for depositing a charge over the length of a portion of a photosensitive paper, which length corresponds to that of the original, and means for exposing the paper placed at a predetermined position to the light from the entire area of the supporting window.

Abstract: Disclosed is a magnetographic apparatus wherein a large number of copies of the same picture is produced by repeatedly using a recording drum on which a latent image of the picture is recorded, which apparatus is different from a conventional magnetographic apparatus wherein a sequence of processes consisting of a latent image recording process, a process of developing the image and a process of transferring the image is effected for production of each copy. Further disclosed herein are structural elements of a magnetographic apparatus which are suitable for producing a large number of copies of the same picture by repeatedly using a recording drum as described above.

Abstract: A storage target having a collector electrode formed in a striped or latticed pattern on a storage substrate which is fabricated from a single crystal of electrically insulating material. Preferably, the storage substrate is of a single rhombohedral crystal of aluminum oxide or of a single isometric crystal of magnesium oxide, spinel, or calcium fluoride.

Abstract: Disclosed is an electrode for a carbon transmitter which comprises a body of an electrically conductive material, such as metal or a conductive resin, with at least a part of the surface of the body comprising electrically conductive carbon. Such an electrode may be prepared by applying a carbon coating onto the metallic substrate or by molding a molding resin material having particulate conductive carbon dispersed therein. The electrode has stable electrical properties comparable to those of the known gold-plated electrode.

Abstract: An intercom calling apparatus in a key telephone system including a page switch for switching the transmitter from a talking circuit network to an intercom calling path while a contemporaneous call on a central office line is held by the series combination of a resister and a varistor forming a parallel circuit with the transmitter in the talking circuit network.

Abstract: Disclosed is a method and apparatus for carrying out Magnetography utilizing the relationship between half-tones of a picture and the spatial recording density on a magnetic recording material. The picture signal is converted into an electrical signal, whose frequency corresponds to the half-tones of the picture and results in the variation of the spatial recording density so that the naturalness of the half-tones of the picture is successfully preserved.

Abstract: Disclosed is a method wherein, in order to prevent background stains in the conventional NRZ system latent image recording method for Magnetography, the latent image recording is effected in such a manner that, in response to a black color representation signal, the direction of the magnetizing field along a generated magnetizing track is periodically reversed, while in response to a white color representation signal, a saturation magnetizing field of a uniform predetermined polarity is applied to adjacent tracks lying in a white region of the signal.

Abstract: An electro-fax type of apparatus for making a plate for offset printing, wherein a system for processing a master paper to be made into the plate is disposed on a horizontal plane so that the master paper is forwarded in the horizontal direction and an optical system is disposed on a plane traversing the forwarding direction of the master paper. The apparatus can be disassembled into several sections which are transportable as individual units, and also can be easily reassembled without deterioration of the accurately adjusted functions of the apparatus.

Abstract: A liquid developer for use in preparing a printing plate for an offset duplicator is provided. The liquid developer comprises a dispersion of image-forming materials comprising finely divided colorant particles and an acrylic or methacrylic acid estergrafted cyclized rubber in a liquid carrier of a high electrical resistivity and a low dielectric constant.

Abstract: A multi-frequency signal receiver comprising an automatic gain control circuit for adjusting the level of the multi-frequency signal, a plurality of bandpass filters for separating the output from the automatic gain control circuit into respective frequency signals, the bandpass filters being grouped into two groups, two detectors respectively detecting the outputs from the two groups of the bandpass filters for producing output voltages respectively proportional to the outputs from the two groups, a recognition circuit for producing an output when the level of the sum of the outputs from the two detectors exceeds a predetermined level, and a plurality of gate circuits respectively responsive to the output from the recognition circuit for passing the outputs from the plurality of bandpass filters.

Abstract: This invention discloses an etching processing apparatus wherein a member in the form of a sponge is soaked in an etching processing liquid vessel, for rubbing a surface of a lithographic master, which is conveyed by an endless belt, which rotates in a predetermined direction, through the etching processing liquid, so that the non-imaged part of the lithographic master may be made hydrophilic by keeping an adequate pressure between the sponge-form member and the endless belt.

Abstract: In electrophotographic apparatus of the type wherein a light image is projected upon a sensitized photosensitive sheet carried by a rotary drum to form an electrostatic latent image, the latent image is developed into a visible toner image and the toner image is transfer printed onto a recording paper, means is provided for permitting projection of the light image only when other devices of the apparatus tending to produce shock or vibration are not operated and for feeding the recording paper in exact synchronism with the rotation of the drum.

Abstract: A line circuit for a key telephone system is provided with a first relay normally energized and a second relay for speech supervision. The operation of the first relay establishes a circuit for holding the second relay and the first relay is released by the voltage drop of a control line normally connected to a line holding control circuit and a visual indication circuit, respectively, at the manual operation of a non-lock type hold key to establish an intermittent signal for line holding indication. A switching transistor is provided in a circuit including the first relay so that the first relay is not energized by the signal intermitently sent to the visual indication circuit, so as to control the line hold control circuit and the visual indication circuit by one control line.

Abstract: A first and a second power source have a predetermined potential difference at their outputs and supply direct currents to a station call line and a direct station selection call line respectively. A non-linear element is inserted between a point at which the station call line and the direct station selection call line are connected to each other and the first power source. When the direct station selection call is established, the non-linear element is turned off due to the potential difference between the first and the second power sources so that the direct station selection call is given priority over the station call.

Abstract: In an automatic telephone answering and recording device associated with a telephone set connected to a remote calling party through a telephone line wherein the message transmitted from the calling party is recorded, there is provided a sound recording tape provided with a plurality of sound tracks, sound recording and reproducing heads cooperating with the tape, a receiving circuit for receiving a message transmitted from the calling party, head switching means for selecting a head associated with the first sound track, control means responsive to the message received by the receiving circuit for recording the message in the first sound track by the selected head, remote control means responsive to a reproduction request signal transmitted from the calling party for causing the control means to reproduce the message in the first sound track by the selected head, and a line control circuit for transmitting the message reproduced from the first sound track to the remote calling party.

Abstract: In display apparatus wherein a picture image corresponding to an information train given by an electronic computer is written in a storage tube by a random scanning system and then the picture image is repeatedly read out of the storage tube by a raster scanning system for displaying it on the screen of a cathode ray tube, means is provided to assure precise correspondence between the information train given by the computer and the position on the screen of the cathode ray tube designated by a light pen thus producing an interruption signal to the computer.