Abstract: A display device includes a light guide plate. A light incident on the light guide plate from a linear light source is reflected by a reflecting surface of each of prisms and emitted from a lower surface of the light guide plate. The emitted light is irradiated onto a liquid crystal panel, reflected by a reflecting layer provided within the liquid crystal panel and advances toward a front direction of a screen. Herein, the light guide plate has on its lower surface as an emission surface a number of minute protrusions each having a shape of triangle in vertical cross-section in a manner that the protrusions cover with no space therebetween a whole effective area of the lower surface, and thereby to obtain an antireflection effect.

Abstract: A display device includes a light guide plate. A light incident on the light guide plate from a linear light source is reflected by a reflecting surface of each of prisms and emitted from a lower surface of the light guide plate. The emitted light is irradiated onto a liquid crystal panel, reflected by a reflecting layer provided within the liquid crystal panel and advances toward a front direction of a screen. Herein, the light guide plate has on its lower surface as an emission surface a number of minute protrusions each having a shape of triangle in vertical cross-section in a manner that the protrusions cover with no space therebetween a whole effective area of the lower surface, and thereby to obtain an antireflection effect.

Abstract: A display device includes a light guide plate. A light incident on the light guide plate from a linear light source is reflected by a wall surface forming each of grooves and irradiated onto a liquid crystal panel unit. Furthermore, a light striking the wall surface at an incident angle equal to or less than a critical angle is transmitted through the wall surface; however, a part of a transmitted light comes again into the light guide plate through another wall surface, and another part of the transmitted light travels straight outwardly without striking the wall surface.

Abstract: A surface light source device includes a light guide plate. A light beam generated from a point light source is irradiated from a corner portion formed at a side surface of the light guide plate. The irradiated light beam is emitted from an upper surface on which prisms are formed. The prisms extend in a circular arc form so as to connect two side surfaces forming the corner portion.

Abstract: This invention was made to reduce cost and the number of assembly processes and improve productivity by making viewing angle characteristics of light emitted from a light emitting surface even irrespective of a point in a bar-shaped light guide. A bar-shaped light guide of this invention comprises a light incident surface for receiving light emitted from a point light source, a light emitting surface, which is orthogonal to the light incident surface, for emitting light received on the light incident surface in a form of beam light, and a pattern surface made up of a side of the light incident surface and a side of the light emitting surface and having a plurality of grooves formed thereon. The plurality of grooves are regularly arranged on the pattern surface. An angle formed by the groove 106 and the side of the light emitting surface on a side of the point light source is 35-55°.

Abstract: This invention was made to reduce cost and the number of assembly processes and improve productivity by making viewing angle characteristics of light emitted from a light emitting surface even irrespective of a point in a bar-shaped light guide. A bar-shaped light guide of this invention comprises a light incident surface for receiving light emitted from a point light source, a light emitting surface, which is orthogonal to the light incident surface, for emitting light received on the light incident surface in a form of beam light, and a pattern surface made up of a side of the light incident surface and a side of the light emitting surface and having a plurality of grooves formed thereon. The plurality of grooves are regularly arranged on the pattern surface. An angle formed by the groove 106 and the side of the light emitting surface on a side of the point light source is 35-55°.

Abstract: An outer light collecting portion 10 which sticks out of a light emission surface 14 to the light emission direction at the same time when a light guide plate is formed by resin forming with a mold. An area of a surface for collecting outer light is larger than that of a conventional light guide plate so as to collect outer light effectively. Light from a light source which is incidence through a light incident surface 12 reflects from a light reflection surface 13 and two side surface 11 of a light guide plate 1, and is emitted as synthesized light having the even directivity from a light emission surface 14.

Abstract: An image forming apparatus includes a photoreceptor, and a developing unit arranged in the vicinity of the photoreceptor. At an upstream side from the developing unit, a precharger is provided in a manner that the same is brought into contact with a surface of the photoreceptor. A developing bias voltage is applied to a developing sleeve, and a charging voltage is applied to the precharger. After the photoreceptor is charged by the precharger, the surface of the photoreceptor is brought into contact with a magnetic brush formed by a developing agent in which an insulative toner and a semiconductive magnetic carrier is mixed, whereby the photoreceptor is charged again by the developing bias voltage through the semiconductive magnetic carrier.

Abstract: An image forming apparatus includes a photoreceptor including a glass substrate and a photoconductive layer laminated thereon. A toner box is provided in the vicinity of the photoreceptor, in which a mixed toner including an insulative non-magnetic toner and a conductive magnetic toner is contained. At an opening of the toner box, a magnetic roller and a developing sleeve which is rotatably put on the magnetic roller are arranged, and a magnetic brush of the mixed toner is formed according to a rotation of the developing sleeve so that the mixed toner is brought into contact with the photoconductive layer. A developing bias having the same polarity as a charged polarity of the insulative non-magnetic toner is applied between the developing sleeve and the photoconductive layer and, at the same time, an exposure light is projected from an LED array on the photoconductive layer through the glass substrate.