A locking claw of a first seat locking mechanism is connected to a locking claw of a second seat locking mechanism by a second wire through a relay member so that, when the first seat locking mechanism is locked by an external force such as pressing down a seat by hand, the second seat locking mechanism is locked in conjunction with the first seat locking mechanism. The hydrogen gas and metal chloride gases are thereafter alternately supplied for a predetermined time while the purge gas is continuously supplied into the chamber, thereby forming a second metal layer on the first metal layer, using a PECVD method. The package body has an end surface, a circumferential surface extending from the end surface, and a receptacle for accommodating a light-emitting chip. The suspended pixelated seating structure also uses aligned material to provide a flexible yet durable suspended seating structure.