Patent application number | Description | Published |
20090296050 | PROJECTION TYPE DISPLAY - A projection type display includes an optical system that includes a focus lens and is configured to project an image, a driver configured to move the focus lens along an optical axis, a phase difference sensor configured to receive light of the image that has been projected, and a controller configured to calculate a phase difference based on an output of the phase difference sensor, to calculate an in-focus position based on the phase difference that has been calculated, and to move the focus lens via the driver to the in-focus position for a focus control of the optical system, wherein the controller provides the focus control while a current position of the focus lens is located within an allowable range that is previously set in a movable range over which the focus lens can move along the optical axis. | 12-03-2009 |
20110019166 | IMAGE PROJECTION APPARATUS - The image projection apparatus includes an image-forming element forming an original image, a projection optical system projecting light from the image-forming element onto a projection surface to form a projected image, an optical shifting part shifting the projection optical system in a first shift range, an image shifting part shifting an image-forming area on the image-forming element in a second shift range, and a controller. In a shift direction in which the projected image is shifted according to an operation of an operating part, the controller causes the optical shifting part to shift the projection optical system in a state where the image-forming area is located closer to a center of the second shift range than an end thereof, and then causes the image shifting part to shift the image-forming area in a state where the projection optical system has been shifted to an end of the first shift range. | 01-27-2011 |
20110273674 | LENS-SHIFTABLE IMAGE PROJECTION APPARATUS - The image projection apparatus projects an image onto a projection surface through a projection optical system including a focus element ( | 11-10-2011 |
Patent application number | Description | Published |
20080232836 | IMAGE FORMING APPARATUS - An image forming apparatus including an exposure device, a development device, an image density detection device, a supply device for supplying a toner to the development device, a cleaning device for cleaning the surface of an image bearing member, a driving torque detection device for detecting a driving torque of the image bearing member, and a controller which drives the image bearing member while providing a predetermined electric potential difference between a region charged in the image bearing member and a developer support in case of non-image formation conducts a driving torque detecting operation with respect to the image bearing member by means of the driving torque detection device, and changes a reference value in response to the value of the driving torque detected. | 09-25-2008 |
20080285993 | IMAGE FORMING APPARATUS - An apparatus is configured to charge an image bearing member in a charging section, develop an electrostatic image formed on the image bearing member, and transfer a toner image formed on the image bearing member to a transfer medium in a transfer section. The apparatus includes a charging auxiliary apparatus for changing a charge amount of toner on the image bearing member. The charging auxiliary apparatus includes a charging auxiliary member contacting with the image bearing member downstream of the transfer section and upstream of the charging section and a voltage applying device to apply a voltage to the charging auxiliary member. The apparatus includes a first detector to detect a current flowing in the charging auxiliary member during a period of non-image formation when the voltage is applied to the charging auxiliary member, a second detector to detect information regarding a toner density in the developing apparatus, and a control device to control toner supply to the developing apparatus based on detection results of both the detectors. | 11-20-2008 |
20100189454 | IMAGE FORMING APPARATUS - An image forming apparatus includes first and second image forming portions. The first and second image forming portions forms a toner image. The second image forming portion forms a toner image so that the toner image is superimposed on the toner image formed by the first image forming portion. The second image forming portion includes an image bearing member, a cleaning member that removes transfer residual toner existing on the image bearing member at an abutting position, and a supply unit that supplies abrasive particles or toner to the abutting position. The image forming apparatus includes a controller that controls the amount of toners or abrasive particles, which are supplied by the supply unit, in accordance with the amount of toner used in the first and second image forming portions. | 07-29-2010 |
20110013937 | IMAGE FORMING APPARATUS - An image forming apparatus is constituted by a rotatable image bearing member; a charging member for electrically charging the image bearing member in contact with the image bearing member; developing member, containing polishing particles, for collecting toner from the image bearing member and effecting development on the basis of an electrostatic latent image formed on the image bearing member; a transfer member for transferring a toner image formed on the image bearing member onto a transfer material; an auxiliary charging member, located downstream from a transfer portion and upstream from the charging member with respect to a movement direction of the image bearing member, for electrically charging toner remaining on the image bearing member after the transfer by contact with the image bearing member; and control means for performing a discharging mode, for discharging polishing particles from the auxiliary charging member onto the image bearing member on the basis of an image ratio of an image to be formed, during non-image formation by applying a voltage to the auxiliary charging member under a condition different from a condition for applying a voltage to the auxiliary charging member during image formation. | 01-20-2011 |
20120076519 | IMAGE FORMING APPARATUS - In an image forming apparatus including a plurality of image forming portions which respectively has a photosensitive drum, a charging roller, an exposure device, a development device, and a primary transfer roller which transfers a toner image developed to the drum to an intermediate transfer belt, for example, surface potential (On-image Vback) of a part overlapping a toner image to be formed at the image forming portion at the downstream of the belt movement direction from the image forming portion is set to be smaller than surface potential (i.e., Center Vback) of another part among surface potential (i.e., fog removal potential) of a non-image part of the photosensitive drum disposed to the image forming portion. | 03-29-2012 |
20120155892 | IMAGE FORMING APPARATUS - An image forming apparatus includes a drum; a developing device, including a developer carrying member for carrying a developer including a non magnetic toner and a magnetic carrier and for conveying the developer to a developing position in which the developer carrying member opposes the drum; a detecting portion for detecting information correlating to a toner charge amount of the developer in the developing device; and a controller capable of executing an operation in a mode, wherein drive of the developer carrying member in a first period in which a non image formation area of the drum corresponding to an internal between a recording material and a subsequent recording material passes through the developing position is stopped or lowered in speed less than that in a second period in which an image area corresponding to the recording material passes through the developing position. | 06-21-2012 |
20130058664 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image forming portion that forms an image on a first image bearing member; a transfer member that transfers the image on the first image bearing member to a second image bearing member; a power supply; a detecting portion that detects a voltage value and a current value; a velocity changing portion; an environment detecting portion; and a controller that determines a transfer voltage value in transferring an image based on a result detected at the detecting portion. An image can be formed at the plurality of velocities. The controller determines a transfer voltage value at a velocity other than the plurality of velocities based on a result detected at the detecting portion and a result detected at the environment detecting portion when the first image bearing member is operated at a predetermined velocity. | 03-07-2013 |
20130058665 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image bearing member; a development device that includes a developer bearing member in a development position opposite to the image bearing member to develop an electrostatic latent image formed on the image bearing member, the developer bearing member bearing and conveying a developer; a bias applying portion that applies a development bias to the developer bearing member; a recording-material sensing portion that senses a type of a recording material to which a toner image developed by the development device is transferred; and a controller that controls the bias applying portion to apply the development bias that degrades a development characteristic when the recording material has low smoothness, compared to high smoothness, from a sensing result of the recording-material sensing portion. | 03-07-2013 |
20130243495 | DEVELOPING APPARATUS - In the case where V-groove portions in a surface of a developing sleeve are located in the closest position between the developing sleeve and a regulating blade, an angle θ formed by a slope surface of the regulating blade with a downstream surface of a V-groove in a rotation direction of the developing sleeve is set to less than 90°. | 09-19-2013 |
20150030354 | DEVELOPMENT DEVICE, AND IMAGE FORMING APPARATUS - A development device includes a developer container | 01-29-2015 |