Abstract: An optical scanning device that scans a scanning surface with a light beam includes a light source that emits the light beam and a pre-deflector optical system that includes at least one diffractive optical element including a diffraction surface having no power at room temperature. The diffraction surface has a multi-step shape having a plurality of zone surfaces substantially perpendicular to an optical axis and a plurality of step surfaces each adjacent to each of the zone surfaces. On a cross sectional plane of the diffraction surface including the optical axis, each of the zone surfaces and each of the step surfaces makes an obtuse angle.

Abstract: A first optical system couples a light beam from a light source, including a first lens made of glass with a positive power and a second lens made of plastic with a negative power. A second optical system focuses the light beam from the first optical system onto a scanning surface and moves a light spot on the scanning surface in a main-scanning direction. One of an incidence plane and an output plane of the first lens is spherical while the other is spherical or flat. A cross-sectional plane of the second lens along one of the main-scanning direction and a sub-scanning direction has a non-arc shape on at least one of the incidence plane and the output plane.

Abstract: A light source part has a light source unit in which the plurality of light sources respectively emitting the light beams at angles different in a sub-scanning direction with respect to an optical standard plane, parallel to a main scanning direction and passing through a standard axis of a surface shape of a lens of the imaging part, which lens is closest to the deflecting part, and applied to the deflecting part at angles different in the sub-scanning direction, are integrally provided; and the plurality of light sources are inclined so that the plurality of light sources thus respectively emit the light beams at the angles different in the sub-scanning direction with respect to the optical standard plane.

Abstract: A photosensitive resin composition which is excellent in storage stability required for one-part type compositions and in processability required for dry-film formation and gives a cured product suitable for FPC substrates or suspension substrates for hard-disc which each retains essential properties required for solder resists, such as heat resistance, water resistance, and electrical-insulation reliability, and has flexibility and low polluting property. The composition comprises: a compound which has a carbon-carbon double bond and carboxy group and is obtained by allowing a bisphenol type epoxy compound and an unsaturated monocarboxylic acid to react and then allowing a polybasic acid anhydride to undergo addition reaction with part or all of the secondary hydroxy groups of the reaction product; a urethane (meth)acrylate compound having a structure derived from a polycarbonate polyol structure; another polymerizable compound having a carbon-carbon double bond; and a photopolymerization initiator.

Abstract: In an optical scanning device, a lateral magnification in a direction corresponding to a sub scanning direction of an optical system is adjusted to be small by a coupling optical system that includes a first lens and a second lens. As a result, scanning by a plurality of light beams can be performed with high precision while avoiding high costs.

Abstract: An optical scanning device includes a light source configured to emit light beams, a deflector to deflect the light beams emitted from the light source, a first optical assembly which is positioned upon a light path of the light beams traveling from the light source to the deflector and which forms an image with the light beams emitted from the light source in a sub scanning direction in a vicinity of the deflector, and a second optical assembly to form the image upon a surface to be scanned with the light beams deflected by the deflector. A principal ray of two of the light beams incident to the first optical assembly, which are located at each respective terminus in the sub scanning direction, are set so as to advance so as either to remain mutually parallel to or converge with one another after passing through the first optical assembly.

Abstract: An optical scanning device which scans a scanned surface by a plurality of light beams in a main-scanning direction includes a light source having a plurality of light-emitting portions which emit the light beams, the light-emitting portions being two-dimensionally arranged in a plane parallel to the main-scanning direction and a sub-scanning direction orthogonal to the main-scanning direction via arrangement intervals in the main-scanning direction and the sub-scanning direction, a deflector which scans the light beams in the main-scanning direction; and a scanning optical system which images the scanned light beams onto the scanned surface.

Abstract: An optical scanning system includes a light source, a polygon mirror, a first optical system, a second optical system, and a monitoring device. The light source includes a plurality of light-emitting units. The first optical system is arranged on an optical path of light beams, and guides the light beams from the light source to the polygon mirror. The second optical system guides the light beams deflected by the polygon mirror to a photosensitive drum. The monitoring device monitors light amount of light beams emitted from the light-emitting units. An optical axis of a coupling lens and a cylindrical lens is inclined from a normal of a deflection-reflection surface of the polygon mirror with respect to a sub-scanning direction.

Abstract: Light beams emitted from a plurality of light source devices are deflected by a shared light deflector. The light beams are respectively concentrated on different scanning subjects using a first scanning lens and second scanning lenses and are used to perform a scan. All light beams make an angle in a sub-scanning direction to a normal line of a reflecting surface of the light deflector. An incidence surface of the first scanning lens is a surface of which a curvature in the sub-scanning direction changes depending on a main scanning direction. The incidence surface of the first scanning lens is also an optical surface of which a negative refracting power becomes stronger toward a periphery of the surface in the main scanning direction.

Abstract: An optical scanning device includes a light-source unit that emits a plurality of light beams, a deflector that deflects the light beams, and an image-forming optical system that receives the light beam deflected by the deflector and forms a spot image on photoconductors. The image-forming optical system includes a first scanning lens that allows only a corresponding light beam to pass and is arranged to form, upon receiving a virtual light beam, the spot image on the photoconductor with a not-curved line. The virtual line lies between a pair of light beams that travels in one of areas separated by a reference plane that is parallel to a sub-scanning direction and on which a normal line to a deflection plane of the deflector falls.

Abstract: Light beams emitted from a plurality of light source devices are deflected by a shared light deflector. The light beams are respectively concentrated on different scanning subjects using a first scanning lens and second scanning lenses and are used to perform a scan. All light beams make an angle in a sub-scanning direction to a normal line of a reflecting surface of the light deflector. An incidence surface of the first scanning lens is a surface of which a curvature in the sub-scanning direction changes depending on a main scanning direction. The incidence surface of the first scanning lens is also an optical surface of which a negative refracting power becomes stronger toward a periphery of the surface in the main scanning direction.

Abstract: A liquid crystal display element includes: a first substrate having a first surface and including a pixel electrode; a second substrate having a second surface opposing to the first surface, and including a light-shielding film, a thickness adjusting film and a counter electrode arranged in sequence in a direction to the second surface; a sealing material having a frame-shape to bond the first substrate and the second substrate; a liquid crystal layer provided in a region surrounded by the sealing material and between the first substrate and the second substrate, wherein the thickness adjusting film is provided to cover the light-shielding film to define the thickness of the liquid crystal layer, and has a contact hole, wherein the counter electrode is provided to oppose to the pixel electrode, and electrically connected to the light shielding film via the contact hole.

Abstract: A light source part has a light source unit in which the plurality of light sources respectively emitting the light beams at angles different in a sub-scanning direction with respect to an optical standard plane, parallel to a main scanning direction and passing through a standard axis of a surface shape of a lens of the imaging part, which lens is closest to the deflecting part, and applied to the deflecting part at angles different in the sub-scanning direction, are integrally provided; and the plurality of light sources are inclined so that the plurality of light sources thus respectively emit the light beams at the angles different in the sub-scanning direction with respect to the optical standard plane.

Abstract: An optical scanning device includes a light deflector that deflects light beams from a light source device and an optical scanning optical system that focuses the light beams deflected by the light deflector on a surface to be scanned, wherein the light beams are made incident on a deflective reflection surface of the light deflector at an angle in a sub-scanning direction with respect to a normal of the deflective reflection surface. The optical scanning optical system has at least one scanning focus lens, and at least one lens surface of the scanning focus lens is a surface, curvature in the sub-scanning direction of which changes according to an image height, and is a surface, curvature in the sub-scanning direction of which on a reference axis of the lens is zero or substantially zero, in order to effectively correct a scanning line curve and deterioration in a wavefront aberration.

Abstract: A lens (1), a lens (2) and a lens (3) constitute a first group of lenses, a lens (4), a lens (5), a lens (6) and a lens (7) constitute a second group of lenses, and a lens (8) constitutes a third group of lenses in a zoom lens of the present invention. The second group of lenses is constituted by a first positive lens (4), a negative lens (5) which is in a meniscus shape which faces its convex shape toward a side of an object (70), a second positive lens (6) in a meniscus shape which faces its convex shape toward the object (70) side, and the third positive lens (7), which are in order from the object (70) side.

Abstract: A lens (1), a lens (2) and a lens (3) constitute a first group of lenses, a lens (4), a lens (5), a lens (6) and a lens (7) constitute a second group of lenses, and a lens (8) constitutes a third group of lenses in a zoom lens of the present invention. The second group of lenses is constituted by a first positive lens (4), a negative lens (5) which is in a meniscus shape which faces its convex shape toward a side of an object (70), a second positive lens (6) in a meniscus shape which faces its convex shape toward the object (70) side, and the third positive lens (7), which are in order from the object (70) side.

Abstract: A zoom lens comprising a first group of lenses (1) having negative focal length, a second group of lenses (2) having positive focal length, and a third group of lenses (3 having the positive focal length in order from an object side, in which the second group of lenses (2) moves monotonically from an image side to the object side and the first group of lenses 1 moves so as to correct shift in a position of an image surface, which is attended with a change in magnification, when the magnification is changed from an end of short focus to the end of long focus. The zoom lens is characterized in that the first group of lenses 1 has at least two lenses (L1) and (L2) and an air lens formed between the two lenses, both sides of the air lens are the aspheric surface, and the first group of lenses satisfies the following conditional expressions of no>1.50 and ni>1.

Abstract: A lens (1), a lens (2) and a lens (3) constitute a first group of lenses, a lens (4), a lens (5), a lens (6) and a lens (7) constitute a second group of lenses, and a lens (8) constitutes a third group of lenses in a zoom lens of the present invention. The second group of lenses is constituted by a first positive lens (4), a negative lens (5) which is in a meniscus shape which faces its convex shape toward a side of an object (70), a second positive lens (6) in a meniscus shape which faces its convex shape toward the object (70) side, and the third positive lens (7), which are in order from the object (70) side.

Abstract: A lens (1), a lens (2) and a lens (3) constitute a first group of lenses, a lens (4), a lens (5), a lens (6) and a lens (7) constitute a second group of lenses, and a lens (8) constitutes a third group of lenses in a zoom lens of the present invention. The second group of lenses is constituted by a first positive lens (4), a negative lens (5) which is in a meniscus shape which faces its convex shape toward a side of an object (70), a second positive lens (6) in a meniscus shape which faces its convex shape toward the object (70) side, and the third positive lens (7), which are in order from the object (70) side.

Abstract: A zoom lens comprising a first group of lenses (1) having negative focal length, a second group of lenses (2) having positive focal length, and a third group of lenses (3 having the positive focal length in order from an object side, in which the second group of lenses (2) moves monotonically from an image side to the object side and the first group of lenses 1 moves so as to correct shift in a position of an image surface, which is attended with a change in magnification, when the magnification is changed from an end of short focus to the end of long focus. The zoom lens is characterized in that the first group of lenses 1 has at least two lenses (L1) and (L2) and an air lens formed between the two lenses, both sides of the air lens are the aspheric surface, and the first group of lenses satisfies the following conditional expressions of no>1.50 and ni>1.