The present invention provides a recording pulse generating apparatus capable of forming a recording pit having a proper shape even at the time of ultra-high-speed recording of, for example, 8\xd7 recording or higher. The invention thus relates to the plants, seeds and tissue cultures of the variety CV960705, and to methods for producing a corn plant produced by crossing a corn plant of variety CV960705 with itself or with another corn plant, such as a plant of another variety. The sealing ring features a central section that connects it with the end plate. A method of laying out an interconnecting motherboard is disclosed which reduces the complexity of the trace routing. Each of the guide grooves is arranged on opposing left and right sides on the outer peripheral edge and has a shallow groove and either a deep groove or a through hole.