Patent application number | Description | Published |
20080278773 | IMAGE READING APPARATUS - An image reading apparatus includes an integral scanning optical unit in which a light source device for illuminating an original placed on an original table, a plurality of mirrors for reflecting a light beam from the original and an imaging optical system for imaging the light beam reflected by the mirrors, upon a reading device, are integrally accommodated, wherein at least one mirror is so configured that the light beam is incident thereon twice or more, wherein, in a sub-scan section, reflection surfaces of the mirrors are disposed in a space at an original-reading-position side of a light entrance surface of the imaging optical system, and wherein the reflection surface of a mirror disposed at a position optically closest to the light entrance surface of the imaging optical system is placed at a position furthermost from the original table with respect to a direction of a normal thereto, as compared with the reflection surfaces of the remaining mirrors. | 11-13-2008 |
20100128329 | IMAGE OPTICAL SYSTEM AND IMAGE READING APPARATUS EQUIPPED WITH SAME - An object is to provide an imaging optical system having a very simple structure that can read image while maintaining excellent image quality without suffering from significant asymmetrical aberrations. An imaging optical system for image reading is adapted to form an image of image information on a surface of an original onto a line sensor while changing a relative position of the original surface and the line sensor to allow the line sensor to read the image information. The imaging optical system includes two off-axial reflecting surfaces, and the two off-axial surfaces are a plus deflecting surface and a minus deflecting surface, or a minus deflecting surface and a plus deflecting surface disposed in the mentioned order from the original surface side, where an off-axial reflecting surface that deflects a reference axis beam clockwise is defined as a minus deflecting surfaces and an off axial reflecting surface that deflects the reference axis beam anticlockwise is defined as a plus deflecting surface. | 05-27-2010 |
20110042839 | METHOD FOR MAKING OPTICAL ELEMENT, AND IMAGE FORMING APPARATUS - A method for injection molding an imaging optical element to be used in an optical scanning apparatus for guiding a light ray in a main scanning direction and a sub-scanning direction. In the imaging optical element, the light ray passes through at least one optical functional surface and does not pass over the meridional line including the optical axis. The imaging optical element is injection-molded through an initial molding step and other various measurement and correction steps. | 02-24-2011 |
20110279881 | IMAGE READING LENS AND IMAGE READING APPARATUS USING IMAGE READING LENS - Provided is an image reading lens to be used for reading image information of an original. The image reading lens includes an anamorphic lens having at least one anamorphic surface with an aspherical shape which is rotationally asymmetric about an optical axis. The anamorphic lens has a non-arc shape in each of a main scanning section and a sub scanning section. The at least one anamorphic surface has a positive optical power in a main scanning direction on the optical axis, and a non-arc amount of the sub scanning section continuously changes with an increase in distance from the optical axis in the main scanning direction. | 11-17-2011 |
20120140111 | ADJUSTING METHOD FOR A LENS UNIT, LENS UNIT AND IMAGE READING APPARATUS - An adjusting method for a lens unit used in an image reading apparatus which images image information of an original onto an image reading unit by the lens unit and reads the image information, the lens unit including rotationally-symmetrical lenses, a lens barrel including the rotationally-symmetrical lenses and an adjusting lens, the adjusting method including: performing rotational adjustment of the lens barrel with respect to the adjusting lens; and imaging an adjusted chart onto one-dimensional photoelectric transducers via the lens unit, obtaining contrast depth characteristics of images corresponding to at least three angles of field of the lens unit among images of the adjusted chart, and, according to the obtained contrast depth characteristics, performing position adjustment of the adjusting lens in at least one of an array direction of the one-dimensional photoelectric transducers, a direction orthogonal to the array direction and an optical axis direction of the lens unit. | 06-07-2012 |
20130070312 | LIGHT GUIDE, ILLUMINATION DEVICE AND IMAGE READING APPARATUS - A light guide has first and second light guide parts (S, T) in front and rear of a constricted part ( | 03-21-2013 |
20130083369 | LIGHT GUIDE, ILLUMINATION DEVICE, AND IMAGE READING APPARATUS - Provided is a light guide, in which: at least one of a reflecting part or a light exit part has a light condensing action in a direction intersecting a predetermined direction; the at least one of the reflecting part or the light exit part includes diffusing parts arranged in the predetermined direction; the diffusing parts include: a first curved surface having a first degree of diffusion in the predetermined direction for a sparse region of light sources; and a second curved surface having a second degree of diffusion, which is lower than the first degree of diffusion, in the predetermined direction for a dense region of the light sources; and each of the first curved surface and the second curved surface has a shape corresponding to a part of a cylinder extending in a direction orthogonal to the predetermined direction in which the light sources are arrayed. | 04-04-2013 |
20130107333 | IMAGE READING OPTICAL SYSTEM AND IMAGE READING APPARATUS | 05-02-2013 |