Abstract: An information processing apparatus comprises a processor configured to execute a program so as to: acquire viewpoint information, motion information and object information; process an object image wherein: the object image is an image representing a virtual substance and is updated based on the viewpoint information and the motion information; calculate a position when superimposing a background image and the object image, wherein: the background image is an image according to the field of view of the user; generate visual information superimposing the background image and the object image based on the position calculated, and output the generated visual information to a display device; and generate tactile information for an ultrasound generator irradiating the user with ultrasound corresponding to the object based on the position calculated, the motion information and the object information, and output the generated tactile information to the ultrasound generator.

Abstract: A crystal oscillator unit which serves as a flat packaged piezoelectric device includes a base member, a quartz piece, and a cap member sealed air-tight to the base member to enclose the quartz piece in cooperation with the base member. Each of the base and the cap members is made of a glass-ceramic composite material in which 30 to 70% by weight of forsterite is dispersed in glass and which has a thermal expansion coefficient between 100.times.10.sup.-7 /.degree.C. and 150.times.10.sup.-7 /.degree.C. The glass consists, in percent by weight, essentially of 50 to 70% of SiO.sub.2, 3 to 15% of Al.sub.2 O.sub.3, 0 to 10% of ZnO, 0 to 8% of B.sub.2 O.sub.3, 7 to 25% of at least one member of CaO, SrO, and BaO, and 13 to 27% of at least one member of Na.sub.2 O, K.sub.2 O, and Li.sub.2 O. The glass and the forsterite are pulverized to an average particle diameter of 1 to 3 microns, mixed together with addition of fine powder of an average particle diameter of 0.