Abstract:
Provided is an image scanning unit which makes it possible to improve scanning accuracy while also making the overall body thinner by appropriately positioning a plurality of reflection members within an effective space in a carriage frame without wasting space. An image scanning unit, wherein a frame is divided into at least two spaces facing an irradiation surface, a first accommodation unit for accommodating a light source unit is formed in one of the spaces, a second accommodation unit for accommodating at least one reflection member is formed in the other adjacent space, a first reflection member for initially receiving light reflected from the irradiation surface is positioned at the side opposite the irradiation surface with the first accommodation unit positioned therebetween, and a light-shielding member is provided between the first reflection member and the reflection member positioned in the other space and prevents light that has strayed from a scanning light path from the first reflection member from being incident on the reflection member in the other space.
Abstract:
To provide an illumination device in which there is no variation in light intensity distribution of the illumination device, and in which illumination spots, particularly light intensity spots, are not prone to occur in a read image in an image reading device, by maintaining a constant gap between a light source and an end face of a light guide. The illumination device includes: a light guide having an end face for taking in light, a diffuse reflecting surface for diffusely reflecting the light taken in from the end face, and a light exit surface for emitting the light that is diffusely reflected at the diffuse reflecting surface towards an irradiation surface. The illumination device further include a reflector having a diffuse reflecting surface that reflects light from the light source toward the one end face of the light guide. The light guide has, at the one end, a flange portion that abuts the reflector, the light source is mounted to a circuit board, and the reflector is held between the flange portion of the light guide and circuit board so as to maintain a predetermined gap between the light source and light guide.
Abstract:
PROBLEM TO BE SOLVED: To provide an illumination apparatus having a simple structure and manufactured inexpensively, which is capable of irradiating a read surface with linear light of a light quantity adapted to the characteristics of a reading optical system.SOLUTION: The illumination apparatus which scatters and reflects light from a light source and irradiates the read surface with linear light is provided with: a light guide which comprises a light scattering surface scattering the light from the light source in a line direction along the read surface and a light emitting surface emitting the light from the light scattering surface, toward the read surface; and the light source disposed at one end face of the light guide. The light source is disposed on one end face of the light guide with a predetermined interval therebetween. A reflector is adhered on the other end face of the light guide with an adhesive material of high light transmissivity therebetween.
Abstract:
PROBLEM TO BE SOLVED: To provide a lighting system in which variation of light quantity distribution of the lighting system does not exist and a lighting spot, especially, a light quantity spot is difficult to occur in an image which is read in an image reader by deciding a forming position of a projection locked in a frame body of a light guide body.SOLUTION: The lighting system includes a light source and the light guide body. The light source is arranged to confront with at least on one end face of the light guide body. The light guide body includes an end face, a diffusion reflection face and a light emission face. The light emission face is formed of a circumference face. The diffusion reflection face is formed in a position where an optical axis normal which passes through a center of a circle forming a circumference face and is emitted from the light emission face. The system includes the frame body storing the light guide body. The light guide body forms the projection locked to the frame body on a side face following the optical axis normal which the diffusion reflection face forms and along a lighting line direction. One end being the tip of a light source side of the projection is formed between a light source side end face of the diffusion reflection face and a light source side end face in a lighting line of a lighting region.
Abstract:
PROBLEM TO BE SOLVED: To provide an image reading device with a first platen for loading and setting an original sheet, and a second platen for moving the original sheet at predetermined speed, and to reduce both the influence that light intensity unevenness is generated when an image is read by the first platen, and the influence that a calorific value is generated, when the image is read by the second platen. SOLUTION: First platen glass for loading and setting the original to read an original image, and second platen glass for running the original at the predetermined speed are arranged in parallel, and a light source lamp for emitting a read light is loaded on a carriage whose position is moved between the first and second platen glass. At this time, level difference is formed onto a contact surface of the first platen glass so that the contact surface of the second platen glass approaches a light source, and an imaging optical means for imaging reflected light from the original image to an image reading sensor is provided with a focus adjustment means for adjusting a focus, so that the focus is adjusted, when the position of the carriage is moved between the first platen glass and the second platen glass. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an illumination device which hardly generates illumination spots and is suitable for an image reading device.SOLUTION: The illumination device includes a light-emitting body, and a light guide for guiding light of the light-emitting body along an illumination line direction and lighting an illumination line zone as a linear light. The light guide having a bar shape extended in a longitudinal direction includes an incident face, first and second side faces, a reflecting face, and an emitting face. The first and second side faces are formed of faces (curved faces) having a first face (curvature) connected with at least the emitting face, and a second face (curvature) connected with the reflecting face. The width in a direction orthogonal to the longitudinal direction of the reflecting face is varied by the second faces (curvature) for forming the first and second side faces, and a reflection pattern face with width spreading out sequentially stepwise with an incident face side as one end face toward the another end in the longitudinal direction is formed on the reflecting face.
Abstract:
PROBLEM TO BE SOLVED: To provide a lightning device which prevents illumination spots and is optimum for an image reading device.SOLUTION: A lightning device comprises an illuminant and a light guide which radiates light of the illuminant incident thereon as a linear light source. The light guide has a rod shape and forms an incidence face facing the illuminant for allowing light incident thereon, lateral faces opposite each other to reflect the incident light in a longer direction, a reflection face for reflecting the reflection light in a direction crossing the longer direction, and an emission face for emitting the reflection light. Also the light guide has a protrusion part which protrudes from the lateral face and extends along the longer direction. The protrusion part extends in the longer direction from a protrusion formation position which is placed at a predetermined distance in the longer direction from an end face forming the incidence face facing the illuminant. The inside of the protrusion part forms reflection surfaces with the lateral sides, and the lateral sides form a shape gradually widening from the protrusion formation position of the protrusion part toward the incidence face.
Abstract:
PROBLEM TO BE SOLVED: To provide an image reader for processing a read mode of a running original at high speed, little affected by heat of a light source, and small in consuming power. SOLUTION: The image reader includes: a first platen for placing and setting an original thereon; a second platen for guiding the original moving at a prescribed speed; a carriage disposed movably between the first and the second platens; a light source means for projecting light to the original on the first and second platens; and an image reading means for performing photoelectric conversion on a reflecting light from the original. The light source means comprises: a first light source which is mounted on the carriage and irradiates the first and second platens with light; a second light source for irradiating the second platen with light; and a light source control means for controlling the first and second light sources. The light source control means has: a control mode for only lighting the first light source in reading the original on the first platen; and a control mode for lighting the first and second light sources in reading the original on the second platen. COPYRIGHT: (C)2009,JPO&INPIT