Abstract: A coupling structure for coupling first and second halves includes two hooks and a two-way securing hook. The first hook includes a first resilient section extending from the first half towards the second half and a first clamping section extending laterally from the first resilient section along a first direction. The second hook includes a second resilient section extending from the first half towards the second half and a second clamping section extending laterally from the second resilient section along a second direction opposite to the first direction. The first and second hooks and the first half cooperatively define a clamping space thereamong. The securing hook includes a securing section projecting from the second half towards the first half, a first interfering section extending laterally from the securing section along the second direction and a second interfering section extending laterally from the securing section along the first direction.

Abstract: The present invention relates to a epicyclic scanning device including a document tray to hold the documents, a rotation shaft for rotating motion, a transmission mechanism joining together with the rotation shaft for circular motion, and an image scanning unit which is to scan the documents on the document tray when the transmission mechanism drive the document stand in the planetary motion, wherein the image scanning unit includes: a scanning light source, a lens group consisting of mirrors and lenses and a image sensing unit.