Osamu Iwasaki
Osamu Iwasaki, Shizuoka JP
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20100020568 | PLANAR LIGHTING DEVICE - It is an object to provide a planar lighting device that is a thin and light in weight, that emits light without luminous unevenness and that is capable of achieving increased dimensions. | 01-28-2010 |
20100110727 | Planar lighting device - A planar lighting device provided with a film in front of the light guide plate, wherein the film can be disposed independently of the light guide plate so that the film does not affect the expansion and contraction of the light guide plate while the expansion and contraction of the film are prevented from affecting the light guide plate. The planar lighting device includes a light guide plate, a light source unit, a film supporter and at least one sheet of film. The light guide plate includes a rectangular light exit plane and a light entrance plane existing one side of the light exit plate, the planar lighting device being installed with that one side being located above the opposite side. The light source is disposed opposite the light entrance plane. The sheet of film is suspended from a film supporter and disposed in front of the light exit plane. | 05-06-2010 |
20100246015 | Light guide plate - A light guide plate comprises: a rectangular light exit plane and at least one light entrance plane in contact with the light exit plane, wherein the light guide plate comprises three or more structural layers disposed on each other in a direction normal to the light exit plane, each structural layer containing scattering particles dispersed therein, the structural layers having different particle densities of scattering particles. | 09-30-2010 |
20100246208 | Light guide plate - A light guide plate comprises: a rectangular light exit plane and at least one light entrance plane in contact with the light exit plane, wherein the light guide plate comprises three or more structural layers disposed on each other in a direction normal to the light exit plane, each structural layer containing scattering particles dispersed therein, the structural layers having different particle densities of scattering particles. | 09-30-2010 |
Osamu Iwasaki, Fujinomiya-Shi JP
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20090303744 | PLANAR ILLUMINATION DEVICE - It is an object to provide a planar illumination device that is thin and light weight, and can emit uniform illumination light with little brightness unevenness and can be enlarged in size. It is to provide a planar illumination device comprising: a first light source and a second light source which are arranged at predetermined intervals; and a light guide plate which is arranged between the first light source and the second light source and has: a light exit surface; a first light incident surface which is opposed to the first light source and includes a side of the light exit surface; a second light incident surface which is opposed to the second light source and includes an opposite side to the side; and a rear surface which is formed to be opposed to the light exit surface, wherein a cross section on a plane perpendicular to the side, of the rear surface of the light guide plate has a curved line in which a distance from the light exit surface increases with a shift from the first light incident surface and the second light incident surface to a center, an inclined angle relative to the light exit surface reduces with a shift from the first light incident surface or the second light incident surface to the center, and the inclined angle relative to the light exit surface is zero degrees at the center. | 12-10-2009 |
20100080019 | PLANAR LIGHTING DEVICE - A planar lighting device comprises: a light guide plate including a concave rectangular light exit plane, two light entrance planes containing two opposite sides of the light exit plane and disposed opposite each other, two symmetrical inclined planes opposing to the light exit plane such that their distance from the light exit plane increases with the increasing distance from the two light entrance planes toward the center of the light exit plane, a curved portion connecting the two inclined planes; two light sources respectively disposed opposite the two light entrance planes for emitting light to enter the light into the light guide plate through the light entrance planes; and sliding mechanisms allowing the light sources to slide in a direction parallel to the light entrance planes of the light guide plate to absorb the expansion and contraction of the light sources along the length thereof. | 04-01-2010 |
Osamu Iwasaki, Maebashi-Shi JP
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20100034610 | SPINDLE DEVICE AND MACHINING CENTER INCLUDING THE SAME - To provide a spindle device and a machining center, in which spindle replacement can be carried out in an extremely short time, downtime during maintenance is short, and productivity is high. In a spindle device | 02-11-2010 |
Osamu Iwasaki, Gunma JP
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20100028094 | SPINDLE DEVICE, MACHINING CENTER INCLUDING THE SPINDLE DEVICE, AND METHOD FOR ASSEMBLING THE SPINDLE DEVICE - A spindle device | 02-04-2010 |
Osamu Iwasaki, Minami-Ashigara-Shi JP
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20080198300 | LIQUID CRYSTAL DISPLAY DEVICE - The liquid crystal display device with a simple configuration is capable of emitting light with a desired color temperature, achieving high light use efficiency, and displaying high quality images. The liquid crystal display device includes a planar lighting device and a liquid crystal display panel. The planar lighting device includes a light source having LED chips for emitting blue light, a transparent light guide plate having a light entrance plane admitting light emitted by the light source and a light exit plane emitting planar light, and a fluorescent member disposed between the light emission plane and the light entrance plane and having one or more fluorescent substance coated areas for emitting white light by converting blue light from the light source into white light and one or more blue light passing areas passing blue light as blue light. The liquid crystal display panel essentially includes red, green and blue filters. | 08-21-2008 |
Osamu Iwasaki, Ashigara-Kami-Gun JP
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20120281166 | LIGHT GUIDE PLATE, SURFACE ILLUMINATING DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE - To provide a light guide plate yielding a high light use efficiency and capable of emitting light with minimized unevenness in luminance and yielding a distribution such that the central area of the screen is brighter than the periphery, a light guide plate includes a rectangular light exit plane, and a light entrance plane for admitting light traveling substantially parallel to the light exit plane, a rear plane provided opposite from the light exit plane, and scattering particles dispersed inside, the light guide plate further including two or more layers lying on one another in a direction substantially perpendicular to the light exit plane and having different particle densities of scattering particles, the two or more layers including a first layer having a particle density of Npo and a second layer having a particle density of Npr and located closer to the rear plane than the first layer, Npo and Npr having a relation Npo11-08-2012 | |
20140063852 | LIGHT GUIDE PLATE, PLANAR LIGHTING DEVICE AND METHOD OF MANUFACTURING LIGHT GUIDE PLATE - A light guide plate is provided which is high in light use efficiency, and is capable of emitting light with reduced luminance unevenness and obtaining a convex distribution. The light guide plate includes two or more layers which change in thickness in a direction substantially perpendicular to a light exit surface. A combined particle concentration changes so as to have a first local maximum value on a side closer to each of one or more light incidence surfaces and a second local maximum value which is larger than the first local maximum value. Each of the one or more light incidence surfaces is a roughened surface obtained by forming a cut and polished surface having a given periodic structure in a direction parallel to a longitudinal direction of each of the one or more light incidence surfaces. | 03-06-2014 |
20140198531 | LIGHT GUIDE PLATE - The light guide plate includes two layers having different particle concentrations, in which the thicknesses of the two layers are varied to change the combined particle concentration of the light guide plate, and conditional expressions of 0.3 mm≦T | 07-17-2014 |
20150070935 | LIGHT GUIDE PLATE - A large-sized thin light guide plate has a first layer on a light exit surface side and a second layer on a rear surface side containing scattering particles at a higher particle concentration than the first layer. Thicknesses of the layers in a direction substantially perpendicular to the light exit surface change to change a combined particle concentration. The scattering particles, obtained by mixing a particle group with an average particle size Ds of less than 7 μm having one or more local maximum values and a particle group with an average particle size Db of more than 7 μm having one or more local maximum values, satisfy 1 μm≦Ds<7 μm, 7 μm03-12-2015 | |
Osamu Iwasaki, Ashigarakami-Gun JP
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20130258707 | LIGHT GUIDE PLATE, PLANAR LIGHTING DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE - The light guide plate has at least two layers which are superposed on each other in the direction almost perpendicular to the light exit surface and contain the scattering particles at different particle concentrations, the scattering particles are polydisperse particles including a mixture of particles with different particle sizes, and the combined particle concentrations in each portion of the light guide plate is different by changing the thicknesses of the first layer and the second layer in the direction almost perpendicular to the exit surface. | 10-03-2013 |
Osamu Iwasaki, Yokohama-Shi JP
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20140321891 | IMAGE FORMING APPARATUS - The present invention relates to an image forming apparatus that forms an image by consecutively superposing toner images that have been formed on a plurality of photosensitive drums, on an intermediate transfer member or a transfer medium. The image forming apparatus is made compact and operates at a low cost. Since a current supply member supplies a current in a rotational direction of an intermediate transfer belt, multiple first transfer portions do not need corresponding voltage sources. Even in the case where a charging member supplies a current, the potential of the intermediate transfer belt is maintained at a predetermined potential by a constant-voltage element connected to support rollers. | 10-30-2014 |