Abstract: A transmission control system for a facsimile transceiver allows two facsimile transceivers having different buffer memory sizes and decoding rates different from encoding rates to intercommunicate within a short period of time. Start and stop of encoding and insertion of fill bits are controlled on the basis of an amount of data stored in a buffer memory of a transmitting transceiver, which temporarily stores encoded data, and various conditions associated with a receiving transceiver, so that the number of bits encoded data per line is averaged over a plurality of lines. This decreases the transmission time and, thereby, increases the transmission rate without resorting to an increase in the processing rate of a reader or that of a recorder or an increase in modem rate.

Abstract: A record material utilizing the color forming reaction between a substantially colorless chromogenic material and an electron accepting reactant material is disclosed. The colorless chromogenic material used comprises a mixture of the first component consisting of at least one specified phthalide compound having two vinyl linkages and the second component of another kind of chromogenic material which is different from said first component. The first component of the chromogenic material is used in an amount of 5 to 80%, preferably 7 to 50%, by weight with respect to the amount of the second component and in such an amount that the reflectance at any wavelength within the range of 580 nm to 880 nm, preferably within the range of 500 to 880 nm of color images developed by said color forming reaction is less by at least 55% than that of said record material before color developing.

Abstract: A facsimile communication machine capable of transmitting and receiving coded picture data is provided. The machine comprises a system control unit including a pair of CPUs, one of which is capable of controlling the reading operation while the machine is in transmission mode and the recording operation while the machine is in receiving mode and the other of which is capable of controlling the coding operation while the machine is in transmission mode and the decoding operation while the machine is in receiving mode. With the use of such a pair of CPUs, parallel processing of reading and coding operations and of decoding and recording operations can be carried out, thereby allowing to significantly increase operational speed.

Abstract: An image signal processing apparatus particularly suitable for use in a facsimile system for converting an analog image signal obtained by photoelectrically reading an original into a binary image signal for further processing is provided. The present image signal processing apparatus comprises a digital-to-analog converter and a digital data input unit, preferably a microcomputer, connected to the converter. Thus, the level of the reference voltage to be supplied to the comparator for converting the analog image signal into the binary image signal may be finely adjusted appropriately without complication in structure.

Abstract: A new fluoran derivative useful as a colorless chromogenic material has the following formula: ##STR1## wherein R, R.sub.1, R.sub.2, R.sub.3, X and Y have the same meaning as defined hereinbefore.

Abstract: A new fluoran derivative useful as a colorless chromogenic material has the general formula: ##STR1## wherein R.sub.1, R.sub.2, X, Y and Z have the same meaning as defined hereinbefore.

Abstract: An image signal processing system for converting an analog image signal into a digital or binary image signal, capable of representing half-tone or gray scale when the corresponding visual image is reproduced by a dot-matrix type printer, is provided. The present system includes storing means for storing at least an array of thresholds, at least one of the thresholds being different in level from the other to form an array pattern. Such a threshold array is used as a reference level in producing a binary image signal. Half-tone is represented by the degree of black dot density per unit area.

Abstract: A process is described for preparing triarylmethane derivatives of a high purity in an extremely high yield from 3-phenylphthalide derivatives and aniline derivatives or indole derivatives with Friedel-Crafts type catalyst or Friedel-Crafts type catalyst and an oxidizing agent.

Abstract: A process is described for preparing triarylmethane derivatives of a high purity in an extremely high yield from 3-phenylphthalide derivatives and aniline derivatives or indole derivatives with Friedel-Crafts type catalyst or Friedel-Crafts type catalyst and an oxidizing agent.

Abstract: A predetermined number of plural lines of compressed data are processed as one group before addition of fill bits while a minimum transmission time for each such predetermined number of lines, that is, plural lines having a predetermined length is determined in advance in consideration of a recording speed and other operating factors of a receiver. Necessary fill bits are added to each plural lines only when the actual transmission time of the plural lines of compressed data is shorter than the minimum transmission time. Fill bits may be added to compressed data bits not only for each plural lines but on a line by line basis in combination in accordance with a construction and function of a receiver.

Abstract: A hydrophobic organic solvent containing a compound of the formula ##STR1## is dispersed and emulsified in an aqueous medium containing a sulfinic acid of the formulaR.sub.5 --SO.sub.2 H (I)and serving as an aqueous medium for preparing microcapsules to react the compounds of the formulae (I) and (II) and synthesize a diarylmethane derivative of the formula ##STR2## while encapsulating oily droplets of the resulting hydrophobic organic solvent solution of the diarylmethane derivative. Colorless chromogenic materials can be synthesized and encapsulated at the same time by this process.

Abstract: A process is described for preparing benzophenone derivatives of a high purity in an extremely high yield from 3-phenylphthalide derivatives with the use of at least one oxidizing agent.

Abstract: A manual switch (11) is movable between a first position in which a cutter (26) is energized to cut a roll of paper (24) in response to an end of transmission of a single facsimile image or in response to an end of transmission of a plurality of facsimile images such as a multi-page document. The switch (11) is further movable to another position at which the cutter (26) is de-energized under all condition.

Abstract: A sheet of copy paper (24) is moved perpendicular to a linear array (22) of printing electrodes (221, 222, 223, 224 . . . ). The electrodes (221, 222, 223, 224 . . . ) are selectively energized to form an electrostatic charge pattern on the copy sheet (24) corresponding to one horizontal scan line of an original document. The electrostatic charge pattern is developed by a toner and the resulting toner image fixed to the copy sheet (24). The electrodes (221, 222, 223, 224 . . . ) are divided into a first set (221, 223, 225 . . . ) and a second set (222, 224, 226 . . . ), the electrodes in the second set (222, 224, 226 . . . ) being alternatingly spaced from the electrodes in the first set (221, 223, 225 . . . ) along the length of the array (22). The first set (221, 223, 225 . . . ) of electrodes are selectively energized during a first time period (t1) and the second set (222, 224, 226 . . . ) of electrodes are selectively energized during a subsequent second time period (t2).

Abstract: The method of making impermeable microcapsules comprises the steps of preparing an aqueous dispersion of microcapsules having a capsule wall of a water-insoluble polyamine-epoxy resin and adding to the aqueous dispersion an electrolyte to dehydrate the microcapsules.

Abstract: The black color developing heat-sensitive recording material comprises a base sheet and a color developing layer formed on at least one surface of the base sheet, the color developing layer including colorless or light-colored chromogenic material and acceptor which is reactive with said chromogenic material to develop a black color. At least 60% by weight of the chromogenic material comprises at least two kinds of black color developing fluoran compounds having the eneral formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, X.sub.l and Ym are described hereinafter and the amount of each of said black color developing fluoran compounds is not larger than 90% by weight of the total amount of said black color developing fluoran compounds.

Abstract: Chromogenic compounds for use in pressure sensitive recording sheets represented by the formula: ##SPC1##Are disclosed, wherein R.sub.1 and R.sub.2 are independently, hydrogen substituted or unsubstituted lower alkyl, aliphatic acyl, phenyl substituted aliphatic acyl, benzoyl, aralky, phenyl (the benzene nuclei of those substituents may be further substituted by chlorine, bromine, lower alkyl, lower alkoxy or nitro), allyl, allyl substituted by lower alkyl or phenyl, propargyl, or propargyl substituted by lower alkyl or a phenyl; R.sub.3 and R.sub.4 are independently lower alkyl, benzyl and phenyl (the benzene nuclei or those substiutents may be further substituted by chlorine, bromine, lower alkyl or lower alkoxy), either R.sub.1 or R.sub.2 being other than hydrogen when R.sub.3 and R.sub.4 are both ethyl groups.

Abstract: Novel benz[c]fluoran compounds such as 2-phenylamino-8-diethylamino-benz[c]fluoran, 2-(2',4',6'-trimethylphenylamino)-8-diethylamino-benz[c]fluoran and N-[8-diethylaminobenz[c]fluoran-2-yl]-N-[6-diethylaminofluoran-2-yl]amine, which are useful as a coloring material for record material systems such as pressure-sensitive copying paper or heat-sensitive copying paper, wherein colored images formed by an electron-donoracceptor color-forming reaction between coloring material and acidic material.

Abstract: The transmitting and receiving sections are both energized, and the output of the transmitting section is connected to the input of the receiving section. The intensity of the transmitting section light source is varied, as by opening and closing a switch, and if the output of the receiving section is accurate in response to the light source variation, the transmitting and receiving sections are judged to be operating normally.