Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Minoru Tachibana

Toshiaki Nakamura

Toshio Ishizaki

Akira Enokihara

Toru Yamada

Yasunao Okazaki

Takehiko Yamakawa

Michio Okajima

Kunihiko Minami

Hiroyuki Nakamatsu

Makoto Sakakura

Toshimitsu Matsuyoshi

Jun Murata

Tomoki Uwano

Ryo Haseyama

Hideki Nanba

Junichi Yoshizumi

An infrared lens unit includes a lens barrel and an infrared lens supported on the lens barrel. The lens barrel includes a tubular part extending along a central axis extending in upward and downward directions and having an inner circumferential surface surrounding the central axis and a through-hole therein demarcated by the inner circumferential surface, and a protruding part disposed on the inner circumferential surface of the tubular part. The infrared lens is supported by the tubular part via the protruding part. The infrared lens is made of chalcogenide glass. The protruding part includes, in a cross section of the protruding part on a plane on which the central axis extends a linear portion extending in an upward direction from its lower end to its upper end and a sloping portion including an upper end and a lower end located at the upper end of the linear portion. The first sloping portion is inclined with respect to the linear portion such that the first sloping portion is away from the central axis as extending from the lower end to the upper end of the first sloping portion. The infrared lens contacts the linear portion and the sloping portion of the protruding part.

Infrared lens unit and infrared detection device

A filter device having a frame made of plated steel sheet generates a smaller insertion loss and is excellent in productivity. Resonant elements are shaped into a cylindrical form by bending the steel sheet, whose both sides are plated, before they are placed in a filter housing. A gap formed on a lateral face of each resonant element is brazed with solder, and an outer plated face of each resonant element is brazed with solder to an inner plated face of the frame.

Filter device and method for manufacturing the same

A small in-band-flat-group-delay type dielectric filter having low-loss characteristics with a small amplitude deviation and uniform-group-delay frequency characteristics is obtained, which enables broad-band characteristics to be obtained easily. The in-band-flat-group-delay type dielectric filter includes a plurality of dielectric coaxial resonators, a coupling circuit comprising a combination of reactive elements, with which the dielectric coaxial resonators are coupled to one another, and input/output terminals connected to ends of the coupling circuit. The dielectric coaxial resonators coupled to the input/output terminals are allowed to have a different characteristic impedance from that of the inter-stage dielectric coaxial resonators.

In-band-flat-group-delay type dielectric filter and linearized amplifier using the same

A dielectric resonator filter comprises dielectric resonators, an enclosure having a main body, a lid, and partition walls, interstage-coupling tuning windows, interstage-coupling tuning bolts, input/output terminals, and input/output coupling probes. Resonance-frequency tuning members each composed of a conductor plate and a bolt coupled integrally thereto are attached to the enclosure lid. Undesired-mode suppressing means such as rings attached to the bolts of the resonance-frequency tuning members or bolts attached to the conductor plates or to the enclosure lid are disposed in an undesired-mode excitation space, whereby the occurrence of a disturbed characteristic in the pass band (or stop band) is suppressed.

Dielectric resonator filter

In order to prevent filter characteristics from being deteriorated due to generation of a spurious pulse is unnecessary resonance at a high level in a passing band at the frequency in a microwave region used in a portable telephone system or the like, at least two types of dielectric resonators having different frequency characteristics in unnecessary harmonic modes except for a main mode near the passing band of a filter are arranged in spaces partitioned by partition walls in a shielding unit constituted by a metal case and a lid, so that a dielectric filter which can obtain preferable spurious suppressing characteristics.

Dielectric filter

A filter with a low-noise amplifier includes: two amplification circuits, a first 3-dB hybrid circuit which is connected to an input side of the amplification circuits, a second 3-dB hybrid circuit which is connected to an output side of the amplification circuits, and a filter which is connected to one input terminal of the first 3-dB hybrid circuit. The other input terminal of the first 3-dB hybrid circuit is subjected to matched termination. A signal is inputted to an input terminal of the filter and is outputted from one output terminal of the second 3-dB hybrid circuit and the other output terminal of the second 3-dB hybrid circuit is subjected to matched termination.

Filter with low-noise amplifier

Growing community of inventors

Osaka, Japan

Minoru Tachibana