Abstract: To solve unstableness of sealing capability and friction characteristic caused by intrusion of external pressure into a portion between an oil seal (1) and a dust seal (2), a sealing device for a reciprocating shaft is provided with an oil seal (1) where a main lip (12) tightly contacted with an outer peripheral surface of the reciprocating shaft (113) in the state of facing inside in the axial direction is integrally provided in an inner peripheral portion of an inner installation ring (11), and a dust seal (2) where a dust lip (22) tightly contacted with an outer peripheral surface of the shaft (113) in the state of facing outside in the axial direction is integrally provided in an inner peripheral portion of an outer installation ring (21), and the oil seal (1) is provided with an external pressure seal (16) tightly contacted with the outer installation ring (21).

Abstract: Disclosed is a double converter tuner having an input circuit for performing first band control with respect to an input signal, amplifying a band-controlled input signal after automatic gain control is performed, and further performing second band control of a gain-controlled signal, a first IF (intermediate frequency) converter for converting an output generated from the input circuit to a first IF signal having a higher bandwidth than the reception bandwidth of the input signal, a first IF circuit for amplifying an output from the first IF converter, performing third band control and performing a further amplification, a second IF converter for converting an output generated from the first IF circuit to a second IF signal, and a second IF circuit for amplifying an output from the second IF converter, performing fourth band control, and performing another amplification. The first and second IF converters are arranged on different circuit boards to prevent frequency interference therebetween.

Abstract: A compact or miniaturized well-shielded double superheterodyne tuner is provided, wherein an input circuit portion, a first mixing portion, a first intermediate frequency bandpass filter, a second mixing portion and an output circuit portion are mounted in separated casings. The first mixing portion and the second mixing portion are provided on printed boards and each mounted on a bottom plate of the casing. The casings containing the first and second mixing portion are arranged in a manner such that grounded surfaces of the printed boards contained in the casings are arranged face to face. The casing containing the bandpass filter is contacted adjacently to a common face of the face to face casings. Each of the casings containing the input and output circuit portions is located adjacently to each of faces common to the face to face casings and the filter containing casing. Some structual improvements are also provided for simplifying the manufacture and adjustment of the tuner.