Abstract: An optical scanning device is disclosed. The optical scanning device comprises an overfilled optical system in which an incoming light beam, formed wider than a width in a rotation direction of a rotating multifaceted mirror's reflective surface, is caused to be incident on the reflective surface and a scanning object's scanning surface is scanned by an outgoing beam reflected by the reflective surface. The incoming beam is incident on the rotating multifaceted mirror's reflective surface, having an angle with respect to a virtual vertical surface that is vertical to the scanning surface and the outgoing beam's scanning direction. A light amount distribution for positions on the scanning surface in the scanning direction is corrected based on a slope of a straight line that expresses a ratio of light amount changes for positions on the scanning surface in the scanning direction when scanning the scanning surface using the outgoing beam.

Abstract: A light scanning device of the invention includes a scan deflection range of each of the light fluxes deflected by the deflecting part in a scan period of the scan object with the respective light fluxes is divided into a first deflection range where a reflection angle of each of the light fluxes with respect to the deflecting part is small and a second deflection range where the reflection angle is large. A polarization direction of each of the light fluxes is set such that a reflectivity of the reflective mirror when each of the light fluxes deflected in the second deflection range is reflected becomes larger than a reflectivity of the reflective mirror when each of the light fluxes deflected in the first deflection range is reflected.

Abstract: The invention provides a light-emitting device which is capable of applying light to a display panel with uniformity in brightness and can be made lower in profile. A light-emitting device (11) includes an LED chip (111a), a base support (111b) which supports the LED chip (111a), and a lens (112) disposed in contact with the LED chip (111a) so as to cover the LED chip (111a) and the base support (111b). The lens (112) has first curved sections (1122) which reflect light that has reached a top surface (112a) so that the reflected light is emitted from a side surface (112b), and second curved sections (1123) which refract light that has reached the top surface (112a) to outside so that the refracted light is emitted from the top surface (112a).

Abstract: There are provided a light-emitting device for use in a backlight unit of a display apparatus equipped with a display panel, which can be made lower in profile and is capable of applying light to the display panel with uniformity in the brightness of the display panel in the planar direction of the display panel, as well as a display apparatus equipped with the light-emitting device. A backlight unit includes a printed substrate, a plurality of light-emitting sections each having a base support, an LED chip and a lens, and a reflective member surrounding the light-emitting section. A specular reflection portion is formed in a first reflective region of the reflective member.

Abstract: There are provided a light-emitting device, an illuminating apparatus, and a display apparatus in which, in order to apply light to an object to be illuminated with uniformity in light intensity, the quantity of light which is applied to a part of an edge of a to-be-illuminated region of the to-be-illuminated object located near a light-emitting section can be lessened. A backlight unit includes a printed substrate, a plurality of light-emitting sections each of which has a base support, an LED chip and a lens, and reflective members each of which is placed around the light-emitting section and has a first wall portion and a second wall portion.

Abstract: There are provided a light-emitting device for use in a backlight unit of a display apparatus equipped with a display panel, which can be made lower in profile and is capable of applying light to the display panel with uniformity in the brightness of the display panel in a planar direction of the display panel, as well as a display apparatus equipped with the light-emitting device. A backlight unit includes a plurality of light-emitting devices each having a printed substrate, a base support, an LED chip and a lens, and a reflective member surrounding the light-emitting device. A high-reflection portion is formed in a first reflective region of the reflective member.

Abstract: The invention provides a light-emitting device a light-emitting device for use in a backlight unit of a display apparatus including a display panel, which is capable of applying light to an illumination object with uniformity in brightness in a planar direction of the illumination object and can be made lower in profile. A backlight unit (1) is provided with: a printed circuit board (12); a plurality of light-emitting portions (111) disposed on the printed circuit board (12) and having a base support (111b), an LED chip (111a) and a lens (112); and a first reflective member (118) disposed on a periphery of each light-emitting portion (111) and having a first reflecting portion (1181) and a second reflecting portion (1182).

Abstract: An optical scanning device includes an enclosure having a plurality of windows covered with transparent members. The enclosure houses a plurality of light sources, a scanning portion, optical elements and a light amount attenuation portion. The scanning portion deflects each of a plurality of light beams emitted from a plurality of light sources at a constant angular speed in a main scanning direction. The optical elements constitute respective light paths from the scanning portion to the windows for the plurality of light beams, respectively. The light amount attenuation portion attenuates light amount in a light path of a first light source among the plurality of light sources in a downstream side of the position where a light beam emitted from a second light source enters as stray light. The drive portion drives the first light source so as to compensate for light amount attenuated by the light amount attenuation portion.

Abstract: An optical box for an optical scanner includes an optical housing and a lid. The optical housing has an opening and a side wall surrounding the opening. The side wall includes inward recessed parts, each of which has a protrusion formed on its outer side. The protrusion can engage with the lid. The lid can so engage with the optical housing as to cover the opening of the housing. The lid has a pair of dust guard walls, between which the whole side wall of the optical housing is sandwiched when the lid is in engagement with the housing.

Abstract: A backlight unit has a printed circuit board, a plurality of light-emitting portions each including a base, an LED chip, and a lens, and a reflective member surrounding the light-emitting portion. An area ? of a figure defining the contour of the reflective member as planarly viewed in an optical-axis direction parallel to an optical axis of the LED chip is determined on the basis of ?×?/? in which a quantity of light which exits through the transmitting region of the lens is represented by ?, a quantity of light which exits through the entire surface of the lens is represented by ?, and an area of the lens as planarly viewed in the optical-axis direction is represented by ?.

Abstract: A substrate fastening structure is provided with a substrate on which an optical detection sensor is mounted, and a casing to which the substrate is secured internally. The casing is provided with a reference portion having a reference groove formed in a perpendicular direction with respect to a first surface configured on an inner side of the casing, and an opposing portion having an opposing groove that opposes the reference groove. The opposing portion is provided with a pass-through hole that is located on an extension of a straight line on which the reference groove and the opposing groove oppose each other, and that passes through the opposing portion. The substrate is inserted extending across the reference groove and the opposing groove, and has an opposing end face that opposes the opposing portion, and has a cut-out portion formed in the opposing end face, and a fastening member that is inserted into the pass-through hole presses the cut-out portion.

Abstract: In one embodiment of an optical scanning apparatus, a light blocking member is provided that is disposed facing a reflective face of a polygon mirror near the reflective face, and blocks stray light without blocking light in an effective scanning range of a laser beam. The light blocking member includes a light blocking plate having an opposing face that faces the reflective face of the polygon mirror, a support plate that supports the light blocking plate, and a fixing plate that fixes the lower edge portion of the support plate to a support member. The opposing face of the light blocking plate is inclined relative to the reflective face of the polygon mirror, and a space below the light blocking plate is open.

Abstract: In an optical scanning device, a beam outputted from a light source is deflected by an optical deflector, and an object to be scanned (for example, a photosensitive drum) is scanned by the deflected beam. The optical scanning device is provided with a light source that outputs a beam, an aperture provided with an opening that shapes the beam outputted from the light source, a reducing optical portion that reduces the beam shaped by the aperture, and a collimator, which is arranged within an interval from the light source to the reducing optical portion, and makes the beam parallel. The reducing optical portion outputs the incoming beam as a parallel beam. The aperture and the reducing optical portion are arranged within an interval from the light source to the optical deflector.

Abstract: An optical scanning device cover, covering an upper portion of an optical scanning device, includes an exposure window, a close stopper, an open stopper, and a rotation cam plate. A projection to be held in a link portion of a rotation cam is fixedly provided on a shutter. When the rotation cam is rotated in a direction of an arrow R(1) from a state in which the shutter is closed, A-side of the shutter turns until the shutter comes into contact with the open stopper to open that side of shutter, and thereafter, the B-side of the shutter turns to open that side of the shutter.

Abstract: An optical scanning device includes an enclosure having a plurality of windows covered with transparent members. The enclosure houses a plurality of light sources, a scanning portion, optical elements and a light amount attenuation portion. The scanning portion deflects each of a plurality of light beams emitted from a plurality of light sources at a constant angular speed in a main scanning direction. The optical elements constitute respective light paths from the scanning portion to the windows for the plurality of light beams, respectively. The light amount attenuation portion attenuates light amount in a light path of a first light source among the plurality of light sources in a downstream side of the position where a light beam emitted from a second light source enters as stray light. The drive portion drives the first light source so as to compensate for light amount attenuated by the light amount attenuation portion.

Abstract: 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.

Abstract: One embodiment of an optical scanning device according to the present invention is directed to an optical scanning device comprising an overfilled optical system in which an incoming beam of a light beam from a light source formed wider than a width in a rotation direction of a reflective surface of a rotating multifaceted mirror is caused to be incident on the reflective surface, and a scanning surface of a scanning object is scanned by an outgoing beam reflected by the reflective surface, wherein the incoming beam is caused to be incident on the reflective surface of the rotating multifaceted mirror in a state having an angle with respect to a virtual vertical surface that is vertical to the scanning surface and vertical to a scanning direction of the outgoing beam, and a light amount distribution for positions on the scanning surface in the scanning direction is corrected based on a slope of a straight line that expresses a ratio of change of light amounts for positions on the scanning surface in the scann

Abstract: An optical scanning device cover, covering an upper portion of an optical scanning device, includes an exposure window, a close stopper, an open stopper, and a rotation cam plate. A projection to be held in a link portion of a rotation cam is fixedly provided on a shutter. When the rotation cam is rotated in a direction of an arrow R(1) from a state in which the shutter is closed, A-side of the shutter turns until the shutter comes into contact with the open stopper to open that side of shutter, and thereafter, the B-side of the shutter turns to open that side of the shutter.

Abstract: In one embodiment of an optical scanning apparatus, a light blocking member is provided that is disposed facing a reflective face of a polygon mirror near the reflective face, and blocks stray light without blocking light in an effective scanning range of a laser beam. The light blocking member includes a light blocking plate having an opposing face that faces the reflective face of the polygon mirror, a support plate that supports the light blocking plate, and a fixing plate that fixes the lower edge portion of the support plate to a support member. The opposing face of the light blocking plate is inclined relative to the reflective face of the polygon mirror, and a space below the light blocking plate is open.

Abstract: An optical box for an optical scanner includes an optical housing and a lid. The optical housing has an opening and a side wall surrounding the opening. The side wall includes inward recessed parts, each of which has a protrusion formed on its outer side. The protrusion can engage with the lid. The lid can so engage with the optical housing as to cover the opening of the housing. The lid has a pair of dust guard walls, between which the whole side wall of the optical housing is sandwiched when the lid is in engagement with the housing.