Abstract: To provide a transparent electrode having high infrared light transmittance that is used in an optical communication device using infrared light, particularly infrared light near 1.55 ?m, the transparent electrode of the present invention includes a transparent conductive film, and the extinction coefficient of the transparent conductive film at a wavelength of 1.55 ?m is equal to or less than 0.5.

Abstract: Ultrasonic waves are used to detect the size and the depth of an internal defect S in the face portion 2 of a panel 1. Preferably, the ultrasonic wave is transmitted from the outer surface 2a side of the face portion 2 toward the inner surface 2b to receive a reflected wave reflected on the inner surface 2b side, thereby detecting the size of the internal defect S and the distance of the internal defect S from the inner surface 2a. Upon transmission and reception of the ultrasonic wave, the ultrasonic wave is allowed to propagate through a non-compressive fluid as a medium outside the face portion 2.

Abstract: A funnel-and-neck sealing body comprises a funnel having a substantially rectangular large opening to which a panel for projection tube is sealed, and a circular small opening; and a neck tube of substantially a cylindrical shape sealed to the small opening of the funnel. The neck tube has an electron gun installing region for installing an electron gun therein, and a yoke mounting region for mounting a deflection yoke externally thereon, wherein an outer diameter of the yoke mounting region is smaller than an outer diameter of the electron gun installing region.

Abstract: A funnel-and-neck sealing body comprises a funnel having a substantially rectangular large opening to which a panel for projection tube is sealed, and a circular small opening; and a neck tube of substantially a cylindrical shape sealed to the small opening of the funnel. The neck tube has an electron gun installing region for installing an electron gun therein, and a yoke mounting region for mounting a deflection yoke externally thereon, wherein an outer diameter of the yoke mounting region is smaller than an outer diameter of the electron gun installing region.