Hitachi, Ltd.

Hitachi Koki Co., Ltd.

Ube Industries, Inc.

Hitachi Koki

Hitachi Kiki Co., Ltd.

Hitachi, Ltd. and Hitachi Koki Co., Ltd.

Hitachi Koko Ltd.

Junichi Matsuno

Shogo Matsumoto

Masaru Nakano

Masataka Kawauchi

Tsuyoshi Ogasawara

Keiji Kamio

Akira Mori

Yasuyuki Tsuji

Mitsuo Suzuki

Yasushi Kinoshita

Akira Sasaki

Hiroyuki Tadokoro

Chikara Hiraoka

Shigeru Obata

Masakatsu Fujie

Taisaku Seino

Tetsuro Akasaki

Mikio Tokuyama

Takeshi Kato

Masahiro Yamazaki

Masao Mitani

Taichiro Yamashita

Isao Nakajima

Hiromitsu Tokisue

Takashi Yoshida

Isamu Terashima

Takeshi Shibuya

Toshio Ogiso

Shuho Yokokawa

Yasuo Takuma

Kazutaka Sato

Yukio Kato

Makoto Kurosawa

Toshikazu Tsumura

Tsuneki Kobayashi

Mieko Ishii

Masato Miwa

Hidefumi Ohtsuka

Muneyoshi Akai

Hiromitsu Fukuda

Kazuo Uno

Shigetaka Furukawa

Hiroyoshi Tokoro

Michio Sumiyoshi

Shoji Ukei

Hiroshi Oda

Masaaki Koseki

Yoshio Ohuchi

Tomio Hayano

Yukio Yamamoto

Hideyuki Ouchi

Yoji Hirose

Kazutaka Satou

Youichi Takeuchi

Mitsuyoshi Satoo

Tetsuro Takahashi

Yozo Suzumura

Masao Furuya

Kazumi Takahashi

To invisibly embed additional information in a base pattern and to visualize the additional information, a dislocation is provided in a boundary between the base pattern compose of striped thin lines and the additional information pattern composed of striped thin lines. This dislocation makes the stripes of the patterns discontinuous. The additional information pattern is invisibly embedded in the base pattern such that a sequence of dislocations in the stripes forming the boundary is at an angle equal to or larger than a predetermined angle with respect to the stripe direction.

Printed matter including invisible information and printing system

An image forming device and method utilizing an electrostatic latent image recording medium, developing units reserving different colors for developing images on the recording medium, a dryer for drying the developed images, and an adhesion reinforcer for enhancing adhesion of toner particles including electrostatically pressing dried toner particles against a front surface of the electrostatic latent image recording medium.

Method and apparatus for forming color image

A liquid type development device for developing an electrostatic latent image formed on image-holding equipment by using liquid developer made of a highly insulating solvent and toner particles dispersed in the solvent has a liquid developer tank detachably situated in a cartridge; and at least one supplementary liquid tank containing supplementary liquid to be added to liquid developer contained in the liquid developer tank so as to keep the concentration of nonvolatile components in the liquid developer constant. Further, when the used development cartridge is recovered, and another new development cartridge is bought, a discount price privilege for the newly bought development cartridge is given to a user who has turned in the used cartridge.

Liquid developing device, method of it's maintenance and the method of recovery of supplemental fluid from the liquid developing device

When a negative pressure slider is used in the magnetic head support mechanism with a loading/unloading function, the gimbals is likely to be deformed or damaged. Apart from the first tab provided to the front end of the suspension, the second tab is provided to the front end of the gimbals. In addition to the Suspension supporting ramp, the ramp portion has the second ramp for supporting the gimbals. This arrangement allows the slider mounting gimbals, in addition to the suspension, to be loaded/unloaded. Unlike the conventional drive in which only the suspension is loaded/unloaded, this arrangement enables the gimbals to be loaded/unloaded while maintaining a predetermined space between the gimbals and the suspension, thus reducing the risk of gimbals deformation and damage.

Magnetic head support mechanism and magnetic disk drive

Provided a color recording device for developing a color image with the use of liquid developer in which toner is dispersed, in which liquid developer having a high toner density is preferably used for printing a fine image, which however causes a problem of precipitation of toner or the like. Thus, at least four liquid type color developing units using liquid developer having a high toner density of 5 to 35% are arranged on a rotary base which is rotated so that the developing units are changed over so as to be respectively opposed to a recording medium, and each of the developing units is composed of a cartridge bottle in which the liquid developer is pooled, a supply passage for supplying the liquid developer pumped up from the cartridge bottle onto a pump-up roller for feeding the liquid developer pumped up onto a developing roller. The supply passage can supply a regulated quantity of the liquid developer in association with the rotation of the rotary base.

Recording apparatus with rotatable liquid developer units enabling agitation of liquid developer

Provided is a liquid development apparatus which can restrain carrier liquid in a liquid developer from being evaporated and diffused into the atmosphere, which has a simple and convenient arrangement, and in which a recording medium formed thereon with an electrostatic latent image in accordance with image data is transferred and the electrostatic latent image on the recording medium is developed by a developer in a liquid developer in which toner particles are dispersed. The liquid development apparatus includes a developer supply for feeding the developer containing non-volatile components having a density of 10 to 30 wt. %, a developer holding member having a surface roughness in a range from 8 to 25 .mu.m Rz, for holding the developer fed from the developer supply, and a conductive member facing the developer holding member, interposing the latent image bearing recording medium on which the electrostatic latent image is formed, between itself and the developer holding member, for applying an electric filed between itself and the developer holding member in a direction in which the toner particles are shifted from the developer holding member toward the latent image bearing recording medium.

Liquid development apparatus

An ion flow recording apparatus performs recording making density modulation every pixel. When developing on a fine grain toner is to be performed using a liquid developer for an electrostatic latent image, a developing unit (developing roller) is disposed to face a direction of gravity. Namely, a control valve is provided on a pipe for application of a developer to the developing roller or on a joint portion between the pipe and a developer tank, developing units of different two colors are joined to their developer tank portions, and a rotary shaft is provided on the joint portion to be positioned at a point of symmetry to provide alternate use of the two developing units upon turning them. Therefore, developing for a plurality of colors can be simply performed, and such turning of the developing units enables prevention of the toner from deposition in the liquid developer during developing, thereby making it possible to perform a clear recording.

Ion flow recording apparatus and liquid developing method

An electrostatic recording apparatus using an ion flow is constructed by: a recording paper inserting slot into which a recording paper as a recording medium is inserted; a humidistat for reducing a moisture content of the recording paper; a latent image forming unit for forming an electrostatic latent image onto the recording paper; a charge amount detecting unit for measuring a charge amount of the recording paper; developing units corresponding to respective colors; and a recording paper ejecting slot for ejecting the recording paper. Thus, an electrostatic latent image can be directly stably formed on a general paper.

Electrostatic recording apparatus and its recording method

In a color electrophotographic apparatus, a belt fixing device which includes a pressure roller and a plurality of belt transport rollers for rotating a belt are provided for fixing unfixed toner. In the belt fixing device, a heating roller and a driving roller, which constitute the belt transport rollers, are always kept in contact with the pressure roller so that a fixing belt is curved in contact with the pressure roller, and after fused toner has been cooled, the driving roller applies pressure to the toner to separate the toner from the belt. According to this arrangement, a small-sized fixing device is achieved in which no silicone oil is needed and in which the running stability of sheets and the fixing belt is superior so that a high-quality fixed image can be obtained. A color electrophotographic apparatus using such a fixing device is also achieved.

Electrophotographic apparatus and belt fixing device with non-uniform

An image forming apparatus includes a feed roller mechanism disposed downstream of a transfer corotron 412 constituting a transfer section and composed of driven rollers 506 located on both edges of a continuous recording medium 100 which are outside an image transfer area and a drive roller 508 extending over the whole width of the continuous recording medium 100, so that when transferring a toner image from an image recording member 402, on which the toner image is to be formed, to the continuous recording medium 100, friction by the rollers achieves reliable conveyance against an attraction between the image recording member 402 and the continuous recording medium 100 without disturbing an unfixed image on the continuous recording medium 100. The image forming apparatus further includes a line sensor 43 for detecting a position where a reference edge of the recording medium is present, a line sensor output device which judges a position of the recording medium reference edge in cooperation with the line sensor to send a recording medium reference edge position signal or mask 61 adjustable in position for shielding a portion of a detection window of the line sensor, a recording medium position correction device 11 which finds a recording medium position correction value from an output of the line sensor for carrying out feedback control, and a guide 38 for preventing rising of the recording medium.

Continuous recording medium friction-conveying mechanism in image

An intermediate transcription drum is supported so as to be driven in contacting relationship with a photosensitive belt. The rotating speed of the photosensitive belt driving motor is controlled by a control unit such that one rotation cycle of the intermediate transcription drum becomes a given cycle. An adjustment of the speed control data for the photosensitive belt driving motor is performed in the interval between electrostatic latent image forming. Thereby, a speed difference between the photosensitive belt and the intermediate transcription drum does not occur, and a plurality of the toner images can be transferred and accurately superposed onto the outer surface of the intermediate transcription drum.

Color printer with transfer and superposition of different color toner

A belt-type transfer device which includes an endless belt rotating in contact with a photosensitive drum, with the belt being electrically charged by a corona discharger in a region of contact between the belt and the drum. A plate is provided for shielding the belt from the corona discharging in a vicinity of an outlet of the contact area to reduce electrostatic traction forces between the drum and the sheet in a vicinity of the outlet. The corona discharger may be located near an inlet of the region of contact with respect to a center thereof or a dielectric or electrically conductive film may be provided on an inner surface of the corona discharger on the contact area outlet side to increase the electrical charge of the belt at the inlet and the central portion of the region of contact. A control system detects an electric resistance value of the sheet and changes the corona discharging intensity in accordance with a detected value to stabilize an electrical charge of the belt or, a control system may be provided for slightly lowering a moving speed of the sheet as compared with a rotational speed of the drum at an outlet of the region of contact. Surface roughness of the belt is 5 .mu.m or less and the sheet delivery guides are provided having a volume resistivity of 10.sup.11 .OMEGA.cm or less, which reduces electrical charge caused on the sheet due to frictional contact.

Belt type transfer device for electrophotographic apparatus

A heat fixing device includes a heating head formed by attaching a radiant plate to the radiant surface of a PTC heating element using an adhesive having an excellent thermal conductivity, and embedding a heating unit, of which surfaces except the radiant surface are shielded with an adiabatic material, in a recess formed in a holder for supporting the heating unit.

Heat fixing device and electrophotographic apparatus incorporating the

The present invention relates to a desk-top type color electro-photographic apparatus which is easy in use, small in size and light in weight, wherein maintenance such as changing its photosensitive member can be performed by a user and color adjustment is performed with high accuracy of less than 100 .mu.m. Developing units for four colors are placed in a rank, a single endless-belt-shaped photosensitive member being placed below them to form an approximately oval shape, the photosensitive member being touched with a transfer member on its major axis side to transfer each color of images. In addition to this, the photosensitive member is employed a cartridge type for easiness of user's maintenance and constructed such that highly accurate positioning between the body of apparatus and the cartridge can be performed. Effect of the eccentricity of pulleys is decreased by means of making the pulleys wrapped with the photosensitive member have the identical diameter and making the diameter of the transfer member integer times as large as that of the pulley.

Color electro-photographic apparatus with endless-belt-shaped

An electrophotographic apparatus has a heat-resistant endless belt having a portion which runs from a transfer position to a heat-fixing position, a driving drum for driving the endless belt, a transfer roller for transferring, at the transfer position, a toner image of information to be recorded from a photosensitive drum to the endless belt, a recording medium feed roller for feeding a sheet-type recording medium to the heat-fixing position, and a heater and a pressure roller which are disposed in the heat-fixing position and cooperative to transfer the toner image from the endless belt to the recording medium. The heater is disposed on the inner side of a loop of the endless belt, while the pressure roller is disposed outside the loop. The photosensitive drum, endless belt, transfer roller and heater are mounted on a common frame which is demountable from the frame of the apparatus. The pressure roller is mounted on the apparatus frame so as to be movable towards and away from the endless belt, thereby facilitating mounting and demounting of the common frame.

Electrophotographic copying apparatus having ribbon-shaped toner image

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Toride, Japan

Junichi Matsuno