Patent application number | Description | Published |
20130058683 | IMAGE BEARING MEMBER DRIVE UNIT THAT DRIVES IMAGE BEARING MEMBER, METHOD OF CONTROLLING IMAGE BEARING MEMBER DRIVE UNIT, STORAGE MEDIUM, AND IMAGE FORMING APPARATUS - An image bearing member drive unit which is capable of performing excellent follow-up of random disturbances without increasing the costs and further with reduced energy loss. The image bearing member drive unit is formed by a brushless DC motor, a rotational position detector, a rotary encoder, a drive circuit, a motor driver IC, and a controller. The rotary encoder detects a drive speed of the image bearing member driven by the brushless DC motor. Drive current for the brushless DC motor is controlled according to the detected drive speed and a target speed. When a short brake signal for braking the brushless DC motor is on, current in a direction opposite to the drive current is generated to thereby brake the brushless DC motor. | 03-07-2013 |
20140169831 | IMAGE FORMING APPARATUS THAT PREVENTS SURFACE SPEED DIFFERENCE FROM BEING GENERATED BETWEEN PHOTOSENSITIVE DRUM AND INTERMEDIATE TRANSFER BELT - An image forming apparatus capable of preventing image defects, such as color shift, from being caused, by preventing increased transfer pressure from being applied by a primary transfer section to thereby prevent a surface speed difference from being generated between the photosensitive drum and the intermediate transfer belt. The image forming apparatus includes a photosensitive drum and an intermediate transfer belt that rotates in contact with the photosensitive drum, respective brushless DC motors for driving the photosensitive drum for rotation and the intermediate transfer belt for rotation, and a controller for controlling the brushless DC motors. The controller performs control such that the brushless DC motor applies assist torque to the photosensitive drum, for offsetting load torque acting thereon, thereby enabling the photosensitive drum to be friction-driven by the intermediate transfer belt. | 06-19-2014 |
20140267526 | IMAGE FORMING APPARATUS THAT PREVENTS IMAGE DEFECT CAUSED BY OFF-CENTERING OF ROTATING SHAFT OF PHOTOSENSITIVE DRUM - An image forming apparatus that is capable of forming an electrostatic latent image on the surface of a photosensitive member with high position accuracy even when the shaft of the photosensitive member is off-centered. In the apparatus, exposure devices form electrostatic latent images on respective photosensitive drums, and developing devices develop the electrostatic latent images. An intermediate transfer belt rotates in contact with the photosensitive drums. A rotary encoder detects a rotational speed of a drum shaft of each photosensitive drum. An amount of off-centering of the drum shaft is detected, and a correction coefficient for correcting positional displacement of electrostatic latent images is calculated. A control unit corrects timing of exposure using the calculated correction coefficient, and controls the exposure device to form the image on the photosensitive drum based on the corrected timing of exposure. | 09-18-2014 |
20140270852 | IMAGE FORMING APPARATUS HAVING PHOTOSENSITIVE MEMBER AND INTERMEDIATE TRANSFER MEMBER SUBJECTED TO DRIVING ROTATION CONTROL INDEPENDENTLY - An image forming apparatus stabilized in transferability of an image from the photosensitive member to the intermediate transfer belt. The image forming apparatus includes photosensitive drums and an intermediate transfer belt (ITB) that rotates in contact with each drum, brushless DC motors for driving the drum and the ITB for rotation. Rotary encoders associated with the drum and the ITB detect respective rotational speeds thereof. A controller sets a target value for the drum-associated rotary encoder for making the surface speeds of the drum and the belt equal to each other during normal printing operation, from a detection value from the drum-associated rotary encoder in a state of the drum being friction-driven by the belt at the primary transfer section, and controls the drum-associated motor such that the target value becomes a detection value. | 09-18-2014 |
Patent application number | Description | Published |
20090309457 | PIEZO DRIVE SYSTEM - A piezo drive system includes an elastic fixing frame, a drive element, a rod, and a rotor. A vamplate portion is formed on the outer surface of the rod. One end of the rod is secured to around the center of a face of the drive element. The rotor consists of a cylindrical portion and a disk portion, and can rotate relative to the rod. Protrusions are formed on the inside of a top surface portion of the fixing frame to push against the disk portion. Using the drive element, the rod rotates while tilting and makes a surface contact with the vamplate portion, producing friction. Consequently, the rotor is rotated. | 12-17-2009 |
20120161588 | PIEZOELECTRIC CERAMIC, METHOD FOR PRODUCING SAME, AND PIEZOELECTRIC DEVICE - Disclosed is a piezoelectric ceramic which is characterized by containing [K | 06-28-2012 |
20120229953 | LEAD-FREE PIEZOELECTRIC PORCELAIN COMPOSITION, PIEZOELECTRIC CERAMIC COMPONENT FORMED USING THE COMPOSITION, AND PROCESS FOR PRODUCING PIEZOELECTRIC CERAMIC COMPONENT - Provided is an alkali-niobate-based piezoelectric porcelain composition which has a crystal-structure transition point in the range of operation guarantee temperatures and which, despite this, is inhibited from abruptly changing in capacitance. The piezoelectric porcelain composition comprises Li, Na, K, Nb, Ta, Sb, and O as major constituent elements and has an alkali-niobate-based perovskite structure. When the composition has an ABO | 09-13-2012 |
20130207512 | PIEZOELECTRIC DRIVE ELEMENT AND PIEZOELECTRIC DRIVE UNIT - A piezoelectrically actuated element includes a composite ceramic to which an alternating electric field is applied through external electrodes that are orthogonal to the polarization direction, wherein the composite ceramic is formed from a first piezoelectric ceramic having soft spring characteristics such that the elastic constant decreases with increasing vibration velocity, and a second piezoelectric ceramic having hard spring characteristics such that the elastic constant increases with increasing vibration velocity. Even when the applied electric field is intensified to increase the vibration velocity of the piezoelectrically actuated element, the overall change in the elastic constant is minimized, and fluctuations in the resonance frequency is suppressed. | 08-15-2013 |
20130221807 | PIEZOELECTRIC ELEMENT AND STACKED PIEZOELECTRIC STRUCTURE - A stacked piezoelectric actuator has a laminate structure including piezoelectric layers and cover parts such that when an external electrode is applied with drive voltage, the piezoelectric layers become distorted and the entire stacked piezoelectric actuator deforms, and at that time, the cover parts become displaced, wherein the distortion difference occurring between the piezoelectric layers and the cover parts reduces, thereby inhibiting the development of cracks. Moreover, the surface area of the active region of the piezoelectric layers is the same as the surface area of the active region of the cover parts, and therefore the loss of the displacement transfer, which is produced by the piezoelectric layers, at the cover parts is reliably reduced. | 08-29-2013 |
20130313467 | PIEZOELECTRIC PORCELAIN COMPOSITION - Provided is a Sr | 11-28-2013 |
20130320815 | PIEZOELECTRIC CERAMIC, PIEZOELECTRIC CERAMIC COMPONENT, AND PIEZOELECTRIC DEVICE USING SUCH PIEZOELECTRIC CERAMIC COMPONENT - In a piezoelectric ceramic which has an alkali-containing niobate-based perovskite structure in which constituent elements are Li, Na, K, Nb, and O, a Li | 12-05-2013 |
20140028156 | PIEZOELECTRIC ELEMENT AND METHOD OF MANUFACTURING THE SAME - A piezoelectric element includes first internal electrodes and second electrodes, as well as piezoelectric ceramic layers that are made of ceramics and arranged between the first internal electrodes and second internal electrodes. Manganese is present relatively more abundantly in the areas of the piezoelectric ceramic layers adjacent to the first internal electrodes and second internal electrodes, compared to at the centers of the piezoelectric ceramic layers. Insulation performance of the piezoelectric element is kept from dropping over the course of use. | 01-30-2014 |
20140055009 | PIEZOELECTRIC CERAMIC AND PIEZOELECTRIC ELEMENT - A piezoelectric ceramic is constituted by a polycrystal whose main phase is an alkali-containing niobate perovskite structure, where both elemental nickel and elemental manganese are present at the grain boundary of the polycrystal. The piezoelectric ceramic is such that drop in piezoelectric characteristics due to application of high electric field is suppressed. | 02-27-2014 |
20140368090 | PIEZOELECTRIC DEVICE AND PIEZOELECTRIC CERAMIC COMPOSITION - A piezoelectric device is provided with: a piezoelectric ceramic layer that is obtained by firing a piezoelectric ceramic composition which contains a perovskite composition and an Ag component; and a conductor layer that sandwiches the piezoelectric ceramic layer, wherein Ag is segregated in voids in a sintered body of the perovskite composition in the piezoelectric ceramic layer. The piezoelectric ceramic composition preferably contains a perovskite composition which is represented by (Pba.Rex){Zr | 12-18-2014 |