Patent application number | Description | Published |
20090080038 | LIGHT GUIDE OPTICAL SYSTEM, DOCUMENT ILLUMINATING DEVICE USING SAME, AND IMAGE READING APPARATUS USING SAME - A light guide optical system guides a plurality of light beams emitted from a plurality of point light sources arranged linearly to a predetermined surface. The light guide optical system has a plurality of optical surfaces arranged periodically in the arrangement direction of the plurality of point light sources. Each of the plurality of optical surfaces has power in the arrangement direction of the plurality of point light sources. | 03-26-2009 |
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 |
20110090547 | INSPECTION METHOD AND INSPECTION APPARATUS FOR AN IMAGE READING APPARATUS - An inspection method for an image reading apparatus where image information of an original is imaged on light receiving element lines arranged in a main scanning direction to read the information on different colors. The method includes: acquiring a first color misregistration from image information based on a first striped pattern located at a position optically equivalent to a surface of the original with respect to the light receiving element lines, the first pattern having white and black lines aligned, and having longitudinal directions of the white and black lines aligned in a sub-scanning direction; acquiring a second color misregistration from image information based on a second striped pattern having white and black lines aligned, and having longitudinal directions of the white and black lines aligned at an angle from the main scanning direction; and calculating a color misregistration in the sub-scanning direction based on the measured color misregistrations. | 04-21-2011 |
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 |
20130107333 | IMAGE READING OPTICAL SYSTEM AND IMAGE READING APPARATUS | 05-02-2013 |
20130163054 | METHOD OF DETECTING FLOATING AMOUNT OF ORIGINAL FOR IMAGE READING APPARATUS, METHOD OF IMAGE PROCESSING USING THE SAME, AND IMAGE READING APPARATUS - A method detects the floating amount of an original from an original table based on image information read by an image reading apparatus having the original table on which the original is placed, a line sensor, and a lens array arranged in a direction of arrangement of pixels of the line sensor. The method includes obtaining image information of the original as line image information by performing scanning in the direction of arrangement of pixels of the line sensor, extracting a distinguishing portion from the line image information, detecting a characteristic frequency by frequency analysis of image information of the distinguishing portion, and determining the floating amount of the original from the characteristic frequency. | 06-27-2013 |
20140071499 | IMAGE READING APPARATUS - The image reading apparatus includes a light transmissive member, a first light source causing a first light to enter the light transmissive member from a first side face of side faces thereof, a second light source illuminating a document laid on an upper face of the light transmissive member with a second light, an image sensor photoelectrically converting an optical image, and an imaging optical system forming on image sensor the object image with light exiting from the light transmissive member. The first light source is disposed such that the first light emitted therefrom and entering the light transmissive member from the first side face satisfies a total reflection condition at the upper and lower faces of the light transmissive member. | 03-13-2014 |
20140253982 | ILLUMINATION DEVICE AND IMAGE READING APPARATUS - An illumination device and an image reading apparatus having improved heat resistance and spectral characteristics are provided. An illumination device used in an image reading apparatus that moves relative to a read area of a document includes: a light source; a light guide including an incident surface on which light from the light source is incident and an exit surface from which light from the light source exits; and a spectroscopic unit that is provided between the light source and the light guide and includes, on a surface of a glass substrate facing the light source, a multi-layer film for reflecting infrared light toward the light source. | 09-11-2014 |
20140362423 | IMAGE READING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - An image reading device includes a platen on which an original is to be placed, an illuminating unit configured to illuminate the original, a linear sensor configured to receive light from the original, an optical unit configured to guide the light from the original to the linear sensor, and an aligning portion configured to determine a position of the original in a long-side direction of the linear sensor. The illuminating unit includes a light-guiding member extending in the long-side direction of the linear sensor, and a light source provided only at one long-side end of the light-guiding member. The aligning portion is provided on a side opposite the light source in the long-side direction of the light-guiding member. | 12-11-2014 |