Abstract: An adjustment method for an image-projection display device, in which an image-projection optical unit, a flat screen, and a mirror are provided, and with the method, a bundle of light rays emitted from the image-projection optical unit is bent by the mirror so that a principal light ray, of a bundle of light rays being incident on the center of the flat screen, is made incident on the flat screen at an oblique angle; and the adjustment method comprising steps of, moving one of the image-projection optical unit in the direction orthogonal to the flat screen and the mirror in at least a direction parallel to the flat screen or a direction orthogonal to the flat screen; and moving the other of the image-projection optical unit in the direction orthogonal to the flat screen and the mirror in at least a direction parallel to the flat screen or a direction orthogonal to the flat screen; whereby the position of an image on the flat screen is adjusted without varying a projection distance between the image-projectio

Abstract: An adjustment method for an image-projection display device, in which an image-projection optical unit, a flat screen, and a mirror are provided, and with the method a bundle of light rays emitted from the image-projection optical unit is bent by the mirror so that a principal light ray, of a bundle of light rays being incident on the center of the flat screen, is made incident on the flat screen at an oblique angle; and the adjustment method comprising steps of, moving one of the image-projection optical unit in the direction orthogonal to the flat screen and the mirror in at least a direction parallel to the flat screen or a direction orthogonal to the flat screen; and moving the other of the image-projection optical unit in the direction orthogonal to the flat screen and the mirror in at least a direction parallel to the flat screen or a direction orthogonal to the flat screen; whereby a projection distance between the image-projection optical unit and the flat screen is adjusted without varying the

Abstract: An image-projection display device includes an image-projection optical unit, a flat screen, a first mirror which is closest to the image-projection optical unit, a second mirror which is closet to the flat screen. An angle formed by the second mirror and a normal on the flat screen is defined as an angle ?. An angle formed by the first mirror and a normal on the flat screen is defined as an angle ?. A maximum rotational angle, for adjustment, of the first mirror about an axis which is parallel to the flat screen, and which lies in a plane where the reference principal light ray before and after reflection at the first mirror lies is defined as a maximum adjustable rotational angle C.

Abstract: There is provided a projection device provided with an upright screen, an image projection unit configured to emit light carrying an image to be projected. The image projection unit emits the light toward the upright screen. A first mirror, a second mirror and a third mirror are provided. The light emitted by the image projection unit is reflected by the first, second and third mirrors in this order, and is projected on the upright screen from its behind. An optical path, in a cross section taken on a plane which extends vertically, perpendicular to the upright screen and intersecting with the upright screen at the center thereof, between the second mirror and the third mirror, of a light ray that is incident on the lowermost position of the upright screen is substantially parallel to the upright screen.

Abstract: A projection device is provided with an upright screen on which an image is projected, an image projection unit configured to emit light carrying an image to be projected on the screen, the image projection unit being arranged behind a lower portion of the screen, and a mirror configured to deflect light emitted by the image projection unit toward the screen, the mirror being arranged behind an upper portion of the screen, the mirror having a front edge and a rear edge, the front edge being arranged closer to the screen than the rear edge. The mirror is arrange such that an angle ? meets a formula: 90 - 38.1 ? D H ? ? ? 90 - 27.3 ? D H , where, ? represents an angle formed between the screen and the mirror, D represents a distance between the screen and the rear edge of the mirror, and H represents a length of the upright screen in the direction of the screen.

Abstract: There is provided a projection device having an optical projection system, a curved mirror, a screen, and a light guiding unit. A cross sectional shape of the curved mirror in an X-Z plane has a negative power, and the curved mirror is fixed to the projection device through at least one predetermined fixing point. A cross sectional shape of the curved mirror in an X-Y plane including a deformation reference point defined based on the at least one fixing point has its maximum negative power in a vicinity of the deformation reference point.

Abstract: According to an aspect of the invention, there is provided a scanning device, which is provided with a light source unit that emits a light beam, a collection optical system that converges the light beam emitted by the light source unit principally in an auxiliary scanning direction, a deflector that deflects the light beam converged by the collection optical system, an image forming optical system that converges the light beam deflected by the deflector onto a scan target surface to form a beam spot scanning in a main scanning direction which is perpendicular to the auxiliary scanning direction.

Abstract: A projection device includes an image source unit, a first projecting optical system, an intermediate optical system, and a second projecting optical system. The image displaying area of the image source unit is tilted with respect to a first virtual plane, and an intermediate image is tilted with respect at least the first virtual plane. A following relationship is satisfied: - 1 > tan ? ? ?2 tan ? ? ?1 > f ? ? 1 H 2 ? sin ? ? ?1 where, f1 denotes a focal length of the first projecting optical system, ?1 denotes a tilt angle of the image display surface of the image source unit with respect to the first virtual plane, H represents a length of the image source unit which corresponds to the image projected on the screen in the vertical direction, and ?2 denotes a tilt angle of the intermediate image with respect to the first imaginary surface.

Abstract: According to an aspect of the invention, there is provided a scanning device, which is provided with a light source unit that emits a light beam, a collection optical system that converges the light beam emitted by the light source unit principally in an auxiliary scanning direction, a deflector that deflects the light beam converged by the collection optical system, an image forming optical system that converges the light beam deflected by the deflector onto a scan target surface to form a beam spot scanning in a main scanning direction which is perpendicular to the auxiliary scanning direction.

Abstract: A light scanning device includes a light source configured to emit a laser beam, a deflector configured to deflect and scan the laser beam emitted from the light source in a main scanning direction and an image forming optical system configured to converge the light beam deflected by the deflector as a spot scanning in the main scanning direction on a scanned object surface. The image forming optical system is configured such that at least part of ghost light caused inside the image forming optical system is converged within a predetermined range in the main scanning direction regardless of an incident angle with which the laser beam deflected by the deflector is incident on the image forming optical system, and that the at least part of ghost light is separated from drawing light for forming an image in an auxiliary scanning direction which is perpendicular to the main scanning direction.

Abstract: A light scanning device includes a polygon mirror configured to be rotatable around a rotation axis to reflect and deflect a light beam with a plurality of reflecting surfaces, a light source that makes a light beam incident onto the polygon mirror from an outside of a scanning range of the light beam being scanned in a main scanning direction by the polygon mirror, and an image forming optical system that converges the deflected light beam as a spot scanned in the main scanning direction on a scanned surface. In a state where the light beam is directed to a center of the scanning range on the scanned surface, a chief ray of the light beam intersects with a reflecting surface at a point shifted by a predetermined amount in a direction toward a side opposite the light source front a center of the reflecting surface in the main scanning direction.

Abstract: A projection device is provided with an image source unit, the image source, a first projecting optical system, an intermediate optical system and a second projecting optical system. Optical axes of the first and second projecting optical systems as developed are on a same plane. The image source is tilted, and then the center of the image source is translated in a direction spaced from the first projecting optical system within a plane including the image displaying area of the image source ;unit. In the above configuration, a relationship below may be satisfied: 0<S1?(H/2)×?tan?, where, ? denotes an absolute value of tilt angle, S1 denotes a shift amount of the image source, H denotes a width of the image source within the same plane.

Abstract: A projecting device includes a first projective optical system forming an intermediate image having trapezoidal distortion from light emitted by a display unit displaying a rectangular image, a second projective optical system projecting the light from the intermediate image obliquely onto a screen so that an enlarged image in which the trapezoidal distortion has been corrected will be projected on the screen, and an intermediate optical system leading the light to combine the two projective optical systems. The second projective optical system includes at least one lens having a surface on which first and second ray bundles emitted from both ends of the image displayed by the display unit in regard to a short side direction of the image are totally separate from each other. A prescribed lens included in the at least one lens is configured so that gradients and curvatures at particular positions will satisfy prescribed conditions.

Abstract: A projection device is provided with an image source configured to emit light carrying an image having a rectangular shape, a first projecting optical system configured to form an intermediate image carried by the light emitted by the image source, the intermediate image having a trapezoidal shape due to trapezoidal distortion, an intermediate optical system configured to deflect light forming the intermediate image, a second projecting optical system configured to obliquely project light deflected by the intermediate optical system to a screen of the projection device, the image projected on the screen having a shape similar to the image provided by the image source. Each of the first projecting optical system and the second projecting optical system may be configured to be substantially telecentric toward the intermediate image.

Abstract: A projection device includes an image source unit, a first projecting optical system, an intermediate optical system, and a second projecting optical system. The image displaying area of the image source unit is tilted with respect to a first virtual plane, and an intermediate image is tilted with respect at least the first virtual plane. A following relationship is satisfied: - 1 > tan ? ? ? ?2 tan ? ? ? ?1 > f ? ? ? 1 H 2 ? sin ? ? ? ?1 where, f1 denotes a focal length of the first projecting optical system, ?1 denotes a tilt angle of the image display surface of the image source unit with respect to the first virtual plane, H represents a length of the image source unit which corresponds to the image projected on the screen in the vertical direction, and ?2 denotes a tilt angle of the intermediate image with respect to the first imaginary surface.

Abstract: A projection display device is provided with a semi-transparent screen provided on a front surface of the projection display device, an image formation unit that emits light carrying an image to be projected on the screen, and a first reflector and a second reflector provided on an optical path between the image formation unit and the screen, the light emitted by the image formation unit being reflected by the second reflector and then by the first reflector before incident on the screen. The first reflector is arranged such that an angle formed between the first reflector and the screen is equal to or greater than 45 degrees and less than 90 degrees, and the second reflector is arranged such that an angle formed between the second reflector and the screen is an obtuse angle.

Abstract: There is provided a scanning optical system which includes an imaging optical system having a first plastic lens and a second plastic lens. With regard to an auxiliary scanning direction, the first plastic lens is configured such that origin points of surfaces thereof are located on opposite sides of a principal axis, an amount of shifting of each of the origin points of the surfaces with respect to the principal axis is less than half of a diameter of mirror-finished area of corresponding one of the surfaces thereof, and both of centers of curvature of the surfaces thereof on the respective origin points are positioned on the light source side of the first plastic lens.

Abstract: In a reflective scanning optical system employing an imaging optical system having a curved mirror with a rotationally symmetrical reflecting surface configuration, the change in magnification of the imaging optical system in the auxiliary scanning direction is reduced and thereby the beam spot diameter on the scan target surface is equalized, as well as equalizing the scan line interval on the scan target surface when the system is applied to a multibeam scanning optical system. The imaging optical system of the reflective scanning optical system includes a curved mirror with a rotationally symmetrical reflecting surface and a lens having an anamorphic lens surface configuration on its one side. In the anamorphic lens surface configuration, slope and curvature of the line of intersection of the lens surface and a plane parallel to the auxiliary scanning cross section change independently of each other as the position in the main scanning direction changes.

Abstract: There is provided a scanning optical system which includes an imaging optical system having a first plastic lens and a second plastic lens. With regard to an auxiliary scanning direction, the first plastic lens is configured such that origin points of surfaces thereof are located on opposite sides of a principal axis, an amount of shifting of each of the origin points of the surfaces with respect to the principal axis is less than half of a diameter of mirror-finished area of corresponding one of the surfaces thereof, and both of centers of curvature of the surfaces thereof on the respective origin points are positioned on the light source side of the first plastic lens.