Abstract: A method of improving the ability of plastic layers of a multi-layered optical disc to bond to adhesive materials includes exposing the plastic layers to a plurality of ions. In one embodiment, one side of a plastic layer of a multi-layered optical disc is exposed to a plurality of non-reactive ions, an adhesive material is applied to the side of the plastic layer that was exposed to the plurality of ions, and a second layer of the optical disc is secured to the adhesive material. In another embodiment, a plurality of ions is formed by directing gas molecules through an electric field, and at least 25% of the width of the plastic layer of the multi-layered optical disc is exposed to the plurality of ions at about the same time. The plastic layer is positioned so that the ions contact the plastic layer while the ions still have a charge, and the disc is moved so that at least 25% of the surface of the plastic layer is exposed to the plurality of ions.

Abstract: The invention pertains to an optical disc having increased storage capacity that provides sufficient signals for readability in a majority of players. Pursuant to a first aspect of the invention, acceptable cross-talk levels and increased storage capacity are achieved by decreasing track pitch and pit width. Pit width is decreased based in part on the amount the track pitch has been decreased, and in part on cross-talk levels that are produced by the optical disc when scanned in a majority of players. Pursuant to a second aspect of the invention, acceptable data signals, acceptable tracking signals, and increased storage capacity are achieved by decreasing the pit lengths and by selecting a pit depth. The pit depth is selected based in part on the pit lengths, and based in part on the data signals and the tracking signals produced by the optical disc when scanned in a majority of players.

Abstract: A method of improving the ability of plastic layers of a multi-layered optical disc to bond to adhesive materials includes exposing the plastic layers to a plurality of ions. In one embodiment, one side of a plastic layer of a multi-layered optical disc is exposed to a plurality of non-reactive ions, an adhesive material is applied to the side of the plastic layer that was exposed to the plurality of ions, and a second layer of the optical disc is secured to the adhesive material. In another embodiment, a plurality of ions is formed by directing gas molecules through an electric field, and at least 25% of the width of the plastic layer of the multi-layered optical disc is exposed to the plurality of ions at about the same time. The plastic layer is positioned so that the ions contact the plastic layer while the ions still have a charge, and the disc is moved so that at least 25% of the surface of the plastic layer is exposed to the plurality of ions.