Abstract: An apparatus having a negative dot pattern used in machining a light guide plate. The apparatus includes a machining table unit disposed under the light guide plate, a drive unit disposed over the machining table unit, a plurality of adjustment units disposed over the light guide plate, a plurality of machining support units disposed over the light guide plate, and a plurality of machining units disposed over the light guide plate. When each machining unit has reached a machining position by being transported in transverse and vertical directions above the light guide plate by the drive device, each machining unit engraves dots while the light guide plate is being carried in the machining direction. After the light guide plate is machined, the drive device is transported to an upper position and to a position where next dots are intended to be engraved, and the next dots are sequentially engraved.

Abstract: An automatic parallel adjusting scraper includes a drive-force generating part, a transmitting part, a hinge part and a scraping part. The drive-force generating part generates a first step drive force. The transmitting part is movably coupled to the drive-force generating part and transmits the first step drive force to the hinge part. The hinge part is rotatably coupled to the transmitting part and transmits the first step drive force to the scraping part. The scraping part having teeth is coupled to the hinge part. The scraping part is brought into parallel contact with a curved surface of a light guide plate by the first step drive force. Therefore, the automatic parallel adjusting scraper can precisely trace a three-dimensional curved surface of the light guide plate in two steps so that the optical scattering pattern can be continuously and precisely formed on the surface of the light guide plate.

Abstract: An active scraper which can form a scattering pattern on a light guide plate to a uniform depth even when the light guide plate has a curved surface, and an apparatus for manufacturing a light guide plate using the active scraper. The active scraper includes a drive-force generating part which generates drive force, and a transmitting part which transmits the drive force to teeth of a body part. The active scraper further includes the body part which converts the drive force into surface-unit drive force corresponding to the width of the body part, and a scraping part which is provided on the end of the body part. The scraping part converts the surface-unit drive force into line-unit drive force. The teeth are provided on the scraping part and form grooves of a scattering pattern in a light guide plate at a predetermined pitch.