Abstract:
A light guide includes a plurality of boss portions. A round hole portion is provided near the center of a base member for fixing the light guide, and slit portions are provided on both ends thereof. The round hole portion supports one boss portion in both the longitudinal direction and the lateral direction of the light guide. The slit portions support boss portions in the lateral direction of the light guide, but are free in the longitudinal direction of the light guide. That is, the center of the light guide is fixed from both directions, and thus both ends of the light guides can expand away in the longitudinal direction. This cuts the influence of expansion by half.
Abstract:
A scanner module and an image scanning apparatus employ an illuminator that includes at least one light emitting diode, a light guide to change the direction of the light from the light emitting diode, and a light source holder to which the light emitting diode is mounted, the light source holder being positioned in relation to the light guide such that the light source holder covers an incidence face of the light guide, on which the light from the light source is incident, the surface of light source holder facing the incidence face reflecting light incident thereupon. The reflection of light by the light source holder reduces the possibility of leakage of light, and can enhance luminous intensity of light of the illuminator.
Abstract:
Deformation of a second optical carriage (B) due to heat is large on a (C) side where an inverter (31) is attached and small on a (D) side. A mirror supporting portion inside the second optical carriage (B) supports the mirror at one point on the (C) side and at two points on the (D) side. An angle of the reflecting mirror (8) depends on two protrusions on the (D) side where thermal deformation is small, and the mirror is supported at one point on the (C) side where thermal deformation is large. Thus, even if an angle of the mirror supporting portion (C) changes, the angle of the reflecting mirror (8) is not affected. Therefore, a change in the angle of the reflecting mirror (8) can be controlled to be small when temperature of the second optical carriage (B) rises during a reading operation, and decrease in reading accuracy due to thermal deformation of the second optical carriage (B) can be suppressed.
Abstract:
An image reading apparatus is provided for reading out images printed on a document. The apparatus includes a casing elongated in the primary scanning direction and a transparent cover supported by the casing. In image-reading operation, the cover is held in sliding contact with a document at an image reading line. The apparatus further includes an insulating substrate attached to the casing, light sources for illuminating the image reading line, light sensors for receiving reflected light coming from the image reading line and a luminosity adjuster supported by the casing for equalizing luminosity along the image reading line.
Abstract:
An optical scanner includes a light source for projecting a light beam, a deflector for deflecting the light beam, a reflective member for reflecting the light beam toward a target, a contact member, and a pressing member. The reflective member includes a reflective plane and a rear plane opposite the reflective plane. The contact member contacts one of the rear plane of the reflective member and a first lateral plane perpendicular to the reflective plane to position the reflective member in place. The pressing member presses the reflective member against the contact member and includes a first pressing portion to press the reflective plane of the reflective member and a second pressing portion to press a ridge of the reflective member at which the reflective plane and a second lateral plane opposite the first lateral plane and perpendicular to the reflective plane of the reflective member meet.
Abstract:
An image reading apparatus includes a body; a circuit board fixed to the body; a light emitter disposed on a first surface of the circuit board, the light emitter emitting light with which a document is irradiated; a light guide disposed opposite the circuit board with the light emitter therebetween, the light emitted from the light emitter passing through the light guide; an urging unit; a supporting unit fixed to the body; and a pressing unit. The pressing unit includes a first portion and a second portion. The first portion is pressed in a direction from the light emitter toward the light guide as a result of receiving a force from the urging unit. The second portion presses the light guide against the light emitter as a result of receiving a reaction force from the supporting unit when the first portion is pressed.
Abstract:
An image reading apparatus includes a body; a circuit board fixed to the body; a light emitter disposed on a first surface of the circuit board, the light emitter emitting light with which a document is irradiated; a light guide disposed opposite the circuit board with the light emitter therebetween, the light emitted from the light emitter passing through the light guide; an urging unit; a supporting unit fixed to the body; and a pressing unit. The pressing unit includes a first portion and a second portion. The first portion is pressed in a direction from the light emitter toward the light guide as a result of receiving a force from the urging unit. The second portion presses the light guide against the light emitter as a result of receiving a reaction force from the supporting unit when the first portion is pressed.
Abstract:
An optical unit including a lens unit including a lens and an optical element configured to receive a light beam focused by the lens, and a support member configured to support the lens unit. Cutouts are provided on joint surfaces of the lens unit and the support member, respectively, such that the cutouts on the joint surface of the lens unit match the cutouts on the joint surface of the support member. The cutouts are configured to accommodate a jig inserted thereinto and rotated to move the lens unit relative to the support member and adjust a position of the lens unit in a direction parallel to an optical axis of the lens.
Abstract:
An optical alignment method is for an optical module including a housing unit, a light-sensing unit, and a lens unit. The method includes: (a) through image-capturing techniques, finding a light-sensing component of the light-sensing unit and a predetermined reference point, and determining an actual total optical path length between the light-sensing component and an object position; (b) subtracting a correction distance from the actual total optical path length to obtain a corrected total optical path length; (c) finding a first center line that divides the corrected total optical path length in half; (d) through image-capturing techniques, finding opposite first and second edges of the lens unit, and determining a lens length between the first and second edges; (e) finding a second center line that divides the lens length in half; and (f) assembling the lens unit to the housing unit such that the first and second center lines overlap.
Abstract:
An image scanning apparatus that forms an optical image of a document with an image-forming lens onto an image sensor. In order to prevent deterioration in image-forming performance, the image scanning apparatus includes a restricting member for restricting displacement of the image-forming lens in the direction of the optical axis. The restricting member is provided on a supporting member for supporting the image-forming lens and the image sensor.