Patent application number | Description | Published |
20090016732 | METHOD FOR DRIVING SURFACE EMITTING SEMICONDUCTOR LASER, OPTICAL TRANSMISSION MODULE, AND HANDHELD ELECTRONIC DEVICE - Provided is a method for driving a surface emitting semiconductor laser including an active region that generates light, a resonator structure disposed such that it sandwiches the active region, and a driving electrode that provides power to the active region. The surface emitting semiconductor laser has an internal resistance defined by voltage and current applied to the driving electrode. The method includes applying a modulation signal to the driving electrode, in which the modulation signal has a current amplitude defined by a first current value and a second current value that is greater than the first current value. The modulation signal is in a negative gradient region in which the internal resistance decreases in contrast to the increase of the current. | 01-15-2009 |
20110169905 | IMAGE HOLD BODY AND IMAGE FORMING APPARATUS - An image hold body includes a support body, a plurality of pixel electrodes, charge storage members, switch members, scanning lines, signal lines and shield members. A latent image voltage is applied to the plurality of pixel electrodes based on an image signal. The charge storage members store charge corresponding to the latent image voltage. The scanning lines select and scan pixel electrode groups through the switch members. The signal lines apply the latent image voltage through the switch members to the pixel electrodes of each of the pixel electrode groups selected by the scanning lines. The shield members are provided on the support body corresponding to the signal lines placed in the proximity of the pixel electrodes, and shield an effect of at least a part of an electric field from the signal line on an electric field based on the latent image voltage of the pixel electrodes. | 07-14-2011 |
20110236077 | DEVELOPING DEVICE AND IMAGE FORMING APPARATUS - A developing device include: a toner carrier that is arranged oppositely to an image carrier; a toner-flying electrode member spaced apart from the toner carrier; and an oscillating electric field generating power source that connects the toner-flying electrode member and the toner carrier, and generates an oscillating electric field which causes the toner to fly from the toner carrier. The toner-flying electrode member includes a conductive member that extends at least along a rotational axis direction of the toner carrier; an insulating coating layer that applies insulating coating continuously to a conductive member surface located on a toner carrier side; and an exposed portion where the conductive member surface adjacent to the insulating coating layer and located on an image carrier side is exposed. | 09-29-2011 |
20120062684 | IMAGE CARRIER AND IMAGE FORMING APPARATUS THEREWITH - An image carrier includes: a support that circulatively rotates, a plurality of pixel electrodes; a plurality of switches that are placed like a matrix on the support in a one-to-one correspondence with the pixel electrodes; a plurality of scan signal lines that are provided on the support so as to extend along the rotation axis direction of the support for transmitting a scan signal for selecting; a plurality of latent image forming signal lines; a plurality of signal leads that are provided on the support so as to extend in the rotation axis direction of the support; a scan signal supply device that are provided in an end part other than the pixel electrode placement area; and a latent image forming signal supply device that are provided in an end part other than the pixel electrode placement area. | 03-15-2012 |
20150099317 | SURFACE EMITTING SEMICONDUCTOR LASER, SURFACE EMITTING SEMICONDUCTOR LASER ARRAY, SURFACE EMITTING SEMICONDUCTOR LASER DEVICE, OPTICAL TRANSMISSION DEVICE, INFORMATION PROCESSING APPARATUS, AND METHOD OF PRODUCING SURFACE EMITTING SEMICONDUCTOR LASER - A surface emitting semiconductor laser includes a substrate, a first conductivity-type first semiconductor multilayer reflector, an active layer, a semiconductor layer, a second conductivity-type second semiconductor multilayer reflector that includes a current confinement layer, and a heat dissipating metal member. At least the first semiconductor multilayer reflector, the active layer, the semiconductor layer, and the second semiconductor multilayer reflector are stacked in this order on the substrate. A columnar structure having a top portion, a side surface, and a bottom portion is formed from the second semiconductor multilayer reflector to the semiconductor layer. The heat dissipating metal member is connected to the semiconductor layer exposed at the bottom portion of the columnar structure. | 04-09-2015 |
20160064899 | SURFACE-EMITTING SEMICONDUCTOR LASER, SURFACE-EMITTING SEMICONDUCTOR LASER DEVICE, OPTICAL TRANSMISSION DEVICE, AND INFORMATION PROCESSING DEVICE - Provided is a surface-emitting semiconductor laser including a substrate; a first semiconductor multilayer reflector of a first conductivity type formed on the substrate, the first semiconductor multilayer reflector including plural pairs of a low-refractive-index layer and a high-refractive-index layer; a cavity region formed on the first semiconductor multilayer reflector; a second semiconductor multilayer reflector of a second conductivity type formed on the cavity region, the second semiconductor multilayer reflector including plural pairs of a low-refractive-index layer and a high-refractive-index layer; a columnar structure extending from the second semiconductor multilayer reflector to the cavity region; and a current confinement layer formed inside the columnar structure by selective oxidation of a semiconductor layer containing Al. The cavity region includes an active region; and a cavity extension region interposed between the active region and the first semiconductor multilayer reflector. | 03-03-2016 |
20160064900 | SURFACE-EMITTING SEMICONDUCTOR LASER, METHOD FOR PRODUCING THE SAME, SURFACE-EMITTING SEMICONDUCTOR LASER DEVICE, OPTICAL TRANSMISSION DEVICE, AND INFORMATION PROCESSING DEVICE - A surface-emitting semiconductor laser includes a first semiconductor multilayer film reflector, an active region, a second semiconductor multilayer film reflector, and a current confinement layer including an oxidized region formed by selective oxidation. The current confinement layer includes a first semiconductor layer having a relatively high Al content, a second semiconductor layer that is adjacent to the first semiconductor layer on an active-region side of the first semiconductor layer and has a lower Al content than the first semiconductor layer, and a composition-gradient layer adjacent to the first semiconductor layer on a side of the first semiconductor layer which is opposite to the active-region side. A portion of the composition-gradient layer which faces the first semiconductor layer has a lower Al content than the first semiconductor layer. | 03-03-2016 |
20160099549 | SURFACE-EMITTING SEMICONDUCTOR LASER DEVICE AND METHOD FOR PRODUCING THE SAME - A surface-emitting semiconductor laser device includes a substrate and a semiconductor layer disposed on the substrate. The semiconductor layer includes a first semiconductor multilayer film of a first conductivity type, a first spacer layer, an active layer, a second spacer layer, and a second semiconductor multilayer film of a second conductivity type. The first semiconductor multilayer film and the second semiconductor multilayer film form a cavity. A peak of a pattern of a standing wave formed by the cavity and the center of the active layer are located at different positions. | 04-07-2016 |