Ngk Spark Plug Company, Limited

Junji Kawai

Tatsuo Ogawa

Takaya Yoshikawa

Noboru Ishida

Hisaharu Nishio

Masashi Ando

Hiroshi Isomura

Yasuhiko Nakagawa

Masataka Taguchi

Kenji Hayashi

Shinji Tanabe

A sensor of the present invention includes a sensor element; a metallic shell; an outer tube member fixed to a rear end portion of the metallic shell; and a protective outer tube member covering an outer surface of the outer tube member. The outer tube member has a seal portion being circumferentially in contact with the protective outer tube member directly or via another member, and a front-side separation portion located frontward of the seal portion and spaced apart from and facing the protective outer tube member. A metal coating layer (plating layer) is formed on the outer surface of at least the front-side separation portion of the outer tube member.

Sensor

A sensor comprising a sensor element, a metallic housing holding therewithin the sensor element, an inner tubular member fixed to an axially rearward end of the metallic housing, and an outer tubular member radially surrounding the inner tubular member and having a radially inward crimping section for contact with an outer surface of the inner tubular member, wherein an axially forward end of the crimping section is disposed axially apart from an axially forward end of the outer tubular member by a distance of 1.5 mm or less.

There is provided a ladder type electric filter having a pair of vertically arranged parallel resonators and a pair of series resonators arranged side by side above the parallel resonators and, at the same time, held free from degradation in the performance of the filter, wherein the abutting surfaces of the raised connecting sections of a connecting terminal member that are held in close contact with the respective lower surface-electrodes of the series resonators partly overlap with the abutting surface of the raised connecting section of an output terminal member that is held in close contact with the upper surface-electrode of the upper parallel resonator if viewed from above. A pair of position controlling projections are formed on an insulating shield plate for hermetically sealing the opening of a casing and the centers of the series resonators are respectively defined by the rear end walls of the space regions of the casing so that the centers of the series resonators, those of the parallel resonators and the raised connecting sections, are longitudinally aligned.

Ladder type filter with adjustable resonator positioning member

A method of adjusting a frequency response in a ladder-type electric filter having a pair of parallel resonators and a pair of strip-shaped series resonators arranged in a predetermined manner to form a fundamental filter circuit in which at least one of corner portions of each of the strip-shaped series resonators is beveled without changing its length L to regulate its resonance frequency so that the device can be stored within a case without displacing it from its proper position and held in contact with a contact at its node of vibration.

Growing community of inventors

Nagoya, Japan

Junji Kawai