Sharp Kabushiki Kaisha Corporation

Yoshihisa Yamada

Kenji Nakanishi

Shohichi Fukutome

Yasuhiro Suto

Hisashi Yamanaka

Mitsuharu Yoshimoto

Masahiro Imoto

Tomohiko Okada

Hiroshi Nakatani

Keiji Sakai

Nobuhiro Shirai

Eiji Kurimoto

An illuminating device according to an embodiment included in an image reading apparatus and an image forming apparatus includes light source portions, light-guiding members for illuminating an illumination target from an elongated light emitting face that extends in a longitudinal direction, by guiding light from the light source portions, and holding members for holding the light-guiding members. The holding members include holding portions for removably holding the light-guiding members, and tilted portions that reflect light emitted from the light emitting face, the tilted portions extending from a front end on the light emitting face side of the holding portions, obliquely widening with increasing distance from the light-guiding members.

Illuminating device, image reading apparatus and image forming apparatus

An illuminating device () according to an embodiment of the invention included in an image reading apparatus () and an image forming apparatus (D) includes light source portions (), (), () and (), light-guiding members () and () for illuminating an illumination target (G) from an elongated light emitting face (M) that extends in a longitudinal direction (Y), by guiding light from the light source portions, and holding members () and () for holding the light-guiding members. The holding members include holding portions () and () for removably holding the light-guiding members, and tilted portions () and () that reflect light emitted from the light emitting face (M), the tilted portions extending from a front end on the light emitting face (M) side of the holding portions, obliquely widening with increasing distance from the light-guiding members.

A transparent sheet is attached onto an inclined surface of an original guide plate of an image reading apparatus, and similarly, a transparent sheet is attached onto an inclined surface at an edge portion of a reading guide plate, thereby preventing an original from being chipped by the ground glass-like inclined surfaces and illumination light from being diffused by the ground glass-like inclined surfaces.

Image reading apparatus and image forming apparatus including the same

The present invention provides an illuminating device including a plurality of light-emitting elements arranged in a line, the illuminating device illuminates an irradiation target by irradiating the irradiation target with light that is emitted from the light-emitting elements via a first and a second optical paths. In the illuminating device, a light diffusing portion for diffusing light is provided in one of the first optical path and the second optical path, and an irradiation light amount of said one of the first optical path and the second optical path in which the light diffusing portion is provided is larger than an irradiation light amount of the other optical path.

Illuminating device, image-reading apparatus provided with the illuminating device, and image-forming apparatus provided with the image-reading apparatus

In a light source unit () serving as an embodiment of an illuminating apparatus, when P is a light-emitting element pitch [mm], and H is an optical axis distance [mm] between light-emitting elements () and an original (G), and when, in an illuminance cycle (T) representing repetition of bright and dark areas in a main scanning direction (X) on a light-irradiated face (Gs) of the original (G) caused by the light-emitting elements (), the light-emitting element pitch (P) and the optical axis distance (H) are set such that unevenness [%] (M) (=(LL)/L%]) obtained by dividing a value obtained by subtracting a minimum illuminance value (L) from a maximum illuminance value (L) by an average illuminance value (L) and an inter-unevenness distance [mm] (N) which is a half cycle of the illuminance cycle (T) satisfy the relation M&#x2266;N/2&#x2212;5.5, and more preferably, M&#x2266;N/2&#x2212;7.5.

Illuminating apparatus, image reading apparatus, and image forming apparatus

An embodiment of the present invention provides an illuminating device that is disposed in an image-reading apparatus and image-forming equipment, including a light-source portion on one side; a light-source portion on the other side; and a long translucent light-guiding member having a light-discharging face long in a longitudinal direction thereof, and guiding light derived from the one light-source portion from one end face in the longitudinal direction, and light derived from the other light-source portion from the other end face in the longitudinal direction so that the guided light is irradiated to an object through the long light-discharging face; wherein the one and the other light-source portions are arranged such that positions of optical axes thereof differ from each other in a direction that is parallel to a light-irradiated face of the object and in a direction that is perpendicular to the longitudinal direction of the light-guiding member.

Illuminating device, image-reading apparatus, and image-forming equipment

In regard to a secured original method, an image reading apparatus provided in an image forming apparatus reads a first original guide using an original reading portion and, based on a reading result thereof, changes a reading position of an adjustment sheet in a main scanning direction to enable detection of a difference between a brightness of the first original guide and a brightness of the adjustment sheet. In regard to a moving original method, the image reading apparatus reads a reading member using the original reading portion and, based on a reading result thereof, changes a reading position of an adjustment sheet in a main scanning direction to enable detection of a difference between a brightness of the reading member and a brightness of the adjustment sheet.

Image reading apparatus and image forming apparatus

Emission windows are prevented from being contaminated and are cleaned easily. The emission windows for emitting light beams are disposed on a housing of a laser exposure device having optical elements arranged inside for exposing a photoreceptor, and the upper surface of the housing is provided with a slidable shutter with openings. An image forming apparatus includes guide rails independent of the laser exposure device to movably guide predetermined cleaning brushes in the longitudinal direction of the emission windows. When the cleaning brushes are mounted on the guide rails and moved toward the inner side of the apparatus, the cleaning brushes touch a slant portion of a rib and the shutter is moved to the right to align the openings with the emission windows. While the cleaning brushes touch a longitudinally extending portion, the emission windows are exposed to enable the cleaning of the exposed window using the cleaning tool.

Growing community of inventors

Osaka, Japan

Yoshihisa Yamada