RICOH PRINTING SYSTEMS, LTD. Patent applications |
Patent application number | Title | Published |
20110061216 | LIQUID DISCHARGING HEAD, METHOD OF MANUFACTURING LIQUID DISCHARGING HEAD, AND IMAGE FORMING APPARATUS - A method for manufacturing a liquid discharging head, the method including forming a plurality of nozzles that discharge liquid droplets, forming a plurality of piezoelectric elements that generate pressure for discharging liquid droplets from the respective nozzles; and performing a repolarization process on the piezoelectric elements to set non-uniformity of the droplet discharging characteristics of the nozzles to be in a predetermined range by combining adjustment of a polarization sensitivity and adjustment of a polarization voltage for each of the piezoelectric elements. | 03-17-2011 |
20090190970 | Development Device and Image Forming Apparatus Using the Same - A development device in which abrasion of a developing roller can be reduced to expand the life of the device, and high-speed and high-quality images can be obtained stably over a long time. The developing roller is composed of an elastic body. An intermediate roller made of metal is disposed closely to the developing roller so as to face the developing roller. A magnetic roller is disposed closely to the intermediate roller so as to face the intermediate roller. A developer layer composed of a magnetic carrier and a toner is formed on the surface of the magnetic roller. The developer layer is carried to the intermediate roller side, and only the toner in the developer layer is transferred to the intermediate roller. A toner layer formed thus is transferred from the intermediate roller to the developing roller, and brought into contact with the surface of an image carrying member. | 07-30-2009 |
20090110448 | Fixing Unit and Image Forming Apparatus Having the Same - A fixing unit where an operating force for releasing a nip can be reduced with a small-sized configuration. The fixing unit has a heating roller including a heating element, a pressure belt, pressure arms, pressure springs, and nip load releasing units. The pressure belt is supported in an intermediate position between the pressure arms | 04-30-2009 |
20090087233 | Belt unit and image forming apparatus using the same - According to an aspect of the present invention, there is provided a belt unit including: a belt that is formed in an endless shape; a first roller that supports the belt from an inner side of the belt; a second roller that supports the belt from the inner side of the belt; regulation walls that are disposed on both sides of the second roller and that each includes a boss protruding outwardly, the boss having a tapered portion; and plate frames that are disposed on both sides of the belt and that each includes: a first groove portion that supports the first roller; and a second groove portion that supports the second roller, the second groove portion having a rounded edge formed to be run on by the boss through the tapered portion. | 04-02-2009 |
20090087142 | Semiconductor Laser Module and Light Scanning Device and Image Forming Apparatus Using the Same - An angle β between a principal ray of incident light incident on an optical fiber via a lens system and a marginal ray of reflected light nearest to the principal ray of the incident light when the reflected light is the incident light reflected on an entrance end surface of the optical fiber is larger than an angle θ between the principal ray and a marginal ray of the incident light. A receiving surface is provided separately from an inner surface of a light-passing hole so that the reflected light is received by the receiving surface. Therefore, the reflected light from the entrance end surface of the optical fiber is prevented from returning to a semiconductor laser light source to thereby attain improvement in stability and high reliability of laser light output of the semiconductor laser light source. | 04-02-2009 |
20090074474 | Rotary member, developing device, and image forming apparatus - According to an aspect of the present invention, there is provided a rotary member including: a rotating main body; and support members that are formed to be supported by bearings, wherein each of the support members includes: a spindle core formed of a first metal; and a cylindrical sheath that sheathes a portion of the spindle core where slidably contacting respective one of the bearings and that is formed of a second metal different from the first metal. | 03-19-2009 |
20090060578 | Rotor Driving Force Transmission Device and Image Forming Apparatus having the Device - A driving force transmission device superior in reliability with suppressed rotation fluctuation. The driving force transmission device has gearing reception portions, three arm portions and a press member. The gearing reception portions are formed in the inner circumference of a rotor. The arm portions extend from a shaft radially. The arm portions can be elastically deformed. The arm portions have engagement tooth portions for transmitting a driving force of the shaft to the rotor. The press member presses the rotor to bend the arm portions in the direction where the rotor is pressed. In that state, the gearing reception portions gear with the engagement tooth portions. | 03-05-2009 |
20090058980 | Multi-Beam Image Forming Apparatus - A multi-beam image forming apparatus includes a beam generating unit | 03-05-2009 |
20090042327 | Method for assembling array-type semiconductor laser device - According to an aspect of the present invention, there is provided a method for assembling a semiconductor laser device, including: preparing a laser chip including: a substrate; stripe waveguides that are formed on the substrate and that each includes a gain producing area and a window area; electrodes formed on the stripe waveguides; an insulating layer formed on the electrodes; a metal layer formed on the insulating layer; projections arranged at an interval in the window areas; and joining structures connected to the electrodes and formed in the window areas; preparing a submount including: a first solder; second solders arranged at the interval; and submount electrodes connected to the second solders; contacting the laser chip to the submount by fitting the projections with respect to the second solders; and heating the submount and the laser chip. | 02-12-2009 |
20080317082 | Laser diode array, optical scannning device and printing apparatus - According to an aspect of the present invention, there is provided a laser diode array including: a laser array chip including: a substrate; and at least three of laser diodes that are formed on the substrate; first electrodes that are formed on each of the laser diodes so as to be isolated from one another; a sub-mount; and second electrodes that are formed on the sub-mount so as to correspond to the first electrodes and so as to be isolated from one another, wherein the laser array chip is mounted on the sub-mount through the first electrodes and the second electrodes, and wherein, among contacting surfaces between each of the first electrodes and a corresponding one of the second electrodes, a contacting area of a central one of the contacting surfaces is larger than that of an end one of the contacting surfaces. | 12-25-2008 |
20080316280 | Liquid discharging head, method of manufacturing liquid discharging head, and image forming apparatus - A liquid discharging head includes: a plurality of nozzles that discharge liquid droplets; and a plurality of piezoelectric elements that generate pressure for discharging liquid droplets from the respective nozzles, wherein the piezoelectric elements are performed with repolarization process to set non-uniformity of the droplet discharging characteristics of the nozzles to be in a predetermined range by combining adjustment of a polarization sensitivity and adjustment of a polarization voltage for each of the piezoelectric elements. | 12-25-2008 |
20080308999 | Sheet feeding device - According to an aspect of the present invention, there is provided a sheet feeding device including: a tray holding sheets; a chamber having an opening and generating a negative pressure thereinside; a suction belt that suctions and conveys a first sheet from the sheets and that is configured to be rotatable along with the chamber and deformable into a concave shape along with the opening; a regulating member disposed inside the opening to regulate a concaving amount of the suction belt; a sheet gate disposed in a sheet feeding passage to be opposed to the suction belt and configured to retreat when contacted by the suction belt; and a nozzle that blows air toward the sheet and toward the suction belt. | 12-18-2008 |
20080292374 | Fixing device and electro photographic apparatus using the same - According to an aspect of the present invention, there is provided a fixing device including: a heating roller that generates a heat and is formed to have a mold releasing property; a pressure belt that is brought into contact with the heating roller and is driven according to a rotation of the heating roller; an arm that presses the pressure belt toward the heating roller; and a belt regulating member that contacts an end face of the pressure belt to regulate a shift thereof and is configured to be swingable with respect to the arm. | 11-27-2008 |
20080279585 | Image forming apparatus - A holding unit turns, while holding a latent image writing unit, centered on a turning axis that is arranged on a main body of an image forming apparatus between an opening position and a closing position with respect to the main body. A positioning unit arranged on the main body positions the latent image writing unit with respect to the image carrier, when the holding unit is at the closing position. A biasing unit biases the latent image writing unit to make a contact with the positioning unit. A shock absorbing unit absorbs a shock received by the holding unit and the latent image writing unit when the holding unit is moved from the closing position to the opening position. | 11-13-2008 |
20080279246 | Semiconductor laser apparatus and method for mounting semiconductor laser apparatus - According to an aspect of the present invention, there is provided a semiconductor laser apparatus including: a laser device including: a semiconductor substrate, first and second resonators formed on the semiconductor substrate, and first and second electrodes that are respectively connected with the first and the second resonators and extend away from each other; and a submount including: third and fourth electrodes respectively adhered with the first and the second electrodes; wherein each of the first and the second electrodes includes: an energizing portion covering the corresponding resonator, an adhering portion being disposed separately from the energizing portion and having a height larger than that of the energizing portion, and a stress-absorbing portion formed in the adhering portion. | 11-13-2008 |
20080274570 | Inkjet head, method for producing inkjet head, inkjet recorder and inkjet coater - A method for producing an inkjet head for jetting an ink from a nozzle that is formed on a nozzle main body formed of a metal material, the method includes smoothening a surface of the nozzle main body, applying a silica sol solution to the nozzle main body so as to form a silica sol film, wherein the silica sol solution has a concentration that is controlled to avoid a nozzle clogging in the nozzle main body, heating the silica sol film formed on the nozzle main body to thereby convert the silica sol film into an SiO | 11-06-2008 |
20080226358 | Image forming apparatus - A reciprocating-motion converting mechanism includes a cam that rotates around a rotation center; a reciprocating member that is reciprocated due to rotation of the cam; and a pressing unit that presses the reciprocating member to the cam. A first load torque is generated by a load applied at a point of contact of the cam and the reciprocating motion member. A load applying unit applies a load to the cam to generate a second load torque having a phase substantially opposite to a phase of the first load torque. | 09-18-2008 |
20080224385 | Feeding device and image forming apparatus - A sheet discharge roller has a contact portion in contact with a feed roller and a noncontact portion not in contact with the feed roller. The sheet discharge roller includes a kick-out unit having a projected portion and a recess portion on one end of the noncontact portion in the circumferential direction. A reverse roller also has a contact portion in contact with the feed roller and a noncontact portion not in contact with the feed roller. The reverse roller includes a large-diameter portion on its one end in a direction opposite to a direction of the kick-out unit. The large-diameter portion has a diameter larger than a diameter of the contact portion. | 09-18-2008 |