Abstract: A lead frame for mounting thereon an optical semiconductor device includes a stage, a plurality of leads arranged in a peripheral region of the stage and a support member extended from said stage. An optical semiconductor device includes such a lead frame, a substrate mounted on the stage of the lead frame, an optical semiconductor chip mounted on the substrate and having electrodes which are electrically connected to the electrodes. An optical fiber has a leading end which is mounted on the substrate and an intermediate portion which is fixedly secured to the support member so that the leading end portion is located at a predetermined position with respect to the chip. An insulating sealing material hermetically seals the optical semiconductor chip, the leading end portion of the optical fiber and at least a part of the support member.

Abstract: A lighting arrester of a simple structure facilitates connection of same to a coaxial cable or the like, affording reduced connection costs while providing, optionally, fail-safe and vent-safe functions. A central electrode of the light arrester has a discharging section and a pair of lead terminals extending from opposite ends of the discharging section, each for connection to a signal line. A tubular outer electrode, for connection to an earth line, has an interior space accommodating the central electrode therein. A pair of insulating holders are received at opposite ends of the tubular electrode and the lead terminals extend through and are held thereby for positioning the central electrode within the interior space of the outer electrode, isolating the discharging section from the inner circumference of the outer electrode by a predetermined gap therebetween, the terminals extending outwardly from the outer surfaces of the respective insulating holders.

Abstract: A gas-tube arrester includes an arrester body in which an inert gas is contained, and first and second electrodes face each other separated by an insulator. An insulating, heat-resistant film is in contact with the first electrode and has a plurality of small holes. A low-melting point metal plate layered on the insulating film has a melting point lower than a decomposition or softening temperature of the insulating film. A conductive leaf spring electrically connected to the second electrode presses the low-melting point metal plate toward the insulating film, so that, when a high voltage is applied between the first and second electrodes, an electrical discharge occurs between the first and second electrodes through the small holes of the insulating films.

Abstract: A gas-tube arrester includes an arrester body containing an inert gas and having first and second electrodes positioned in spaced, facing relationship to each other and separated by an insulator. An insulating, heat-resistant film is in contact with the first electrode and has an opening and a plurality of small holes. A metal plate layered on the insulating film has an opening communicating with the opening of the insulating film. A low-melting point metal plate layered on the metal plate to cover the openings has a melting point lower than a softening temperature of the insulating film.