Pioneer Electronic Corporation

Mitsubishi Denki Kabushiki Kaisha

Adv Antest Corporation

Yasuyuki Arai

Tsunehiro Tsukagoshi

Toshikazu Yoshino

Shinichi Yokozeki

Sumio Hagiwara

Masataka Uchidoi

Kengo Takahashi

Masaharu Miwa

Yoshiaki Kuwahara

Tetsuji Uchiyama

Shoji Kojima

Akihiro Matsushita

Akio Fukushima

Kunio Imai

Yasuo Sone

Akinori Toyoda

Shinichi Yokozseki

Etsuro Nemoto

Kazuyoshi Kobayashi

Hiroyuki Oohara

A first current source supplies a tail current It to a plurality of differential pairs. A pre-driver outputs gate signals to the gates of transistors of the corresponding differential pair. A pre-driver is configured to switch the state between the enable state and the disable state. In the enable state, the pre-driver outputs the gate signals that correspond to the differential signals. In the disable state, the pre-driver outputs the gate signals having levels which instruct the transistors of the corresponding differential pair to switch off.

Differential driver circuit

An air condition includes a suction grill for sucking the air in a room, a front panel including an inlet port for sucking the air from the suction grill inside and a blowout port for blowing the air out into the room, a heat exchanger for heat exchange of the air, and a blower for circulating the air, wherein a concave air passage for room temperature detection is formed on the front face of the front panel, and an air suction port for sucking air for room temperature detection is formed in suction grill at an opposite part to air passage.

Air conditioner

An air conditioner includes suction grill for sucking the air in a room, a front panel including an inlet port for sucking the air from the suction grill inside and a blowout port for blowing the air out into the room, a heat exchanger for working heat exchange of the air, and a blower for circulating the air, wherein a concave air passage for room temperature detection is formed on the front face of the front panel, and an air suction port for sucking air for room temperature detection is formed in suction grill at an opposite part to air passage.

In an air conditioner indoor unit having a ventilator and a heat exchanger, there are provided an upper casing of the ventilator made from a porous structure having air permeability, a lower casing of the ventilator having airtightness, and an air chamber formed at the back of the upper casing.

Indoor unit of a ventilation system, ventilation and air conditioner

A molding composition is obtained by blending flaky graphite with a resin component comprising a mixture of a thermoplastic resin having a glass transition temperature higher than room temperature and another thermoplastic resin having a glass transition temperature lower than room temperature. The composition is kneaded and rolled into a sheet to orient the graphite flakes parallel to the surface of the sheet. The rolled sheet is then molded into an article, for example, speaker diaphragm, arm pipe and head shell, which may be optionally be carbonized or graphitized. The resulting article exhibits improved physical properties, especially high specific modulus of elasticity comparable to aluminum and beryllium as well as good internal loss comparable to paper.

Molding compositions and diaphragms, arm pipes and head shells molded

Elements for a tone-arm system such as arm pipes, head shells, cartridge bodies, and arm bases are fabricated from a kneaded mixture comprising polypropylene and flaky graphite powder. The mixture may further include polymethyl methacrylate and/or rubber-like material. Graphite flakes are preferably oriented parallel to the surface of the element. The elements show improved temperature resistance.

Tone-arm elements

Vibratory elements for use in audio equipment are fabricated from a kneaded mixture comprising polypropylene and flaky graphite powder. The kneaded mixture is rolled into a sheet in which graphite flakes are oriented parallel to the surface, and the sheet is then formed into a desired shape, for example, a dome- or cone-shaped diaphragm and a cantilever, as by vacuum forming, air-pressure forming or press molding. The mixture may further include polymethyl methacrylate and/or rubber-like material. The elements are characterized by improved temperature resistance.

Vibratory elements for audio equipment

Vibratory elements for use in audio equipment are fabricated from a kneaded mixture comprising post-chlorinated polyvinyl chloride and flaky graphite powder. The kneaded mixture is rolled into a sheet in which graphite flakes are oriented parallel to the surface and the sheet is then formed into a desird shape, for example, a dome- or cone-shaped diaphragm and a cantilever, as by vacuum forming, air-pressure forming or press molding. The mixture may further include polymethyl methacrylate and/or rubber-like material. The elements are characterized by improved temperature resistance.

A molding composition comprising a thermoplastic resin in admixture with flaky graphite and carbon black is molded into an acoustic article which shows a high specific modulus of elasticity due to graphite and an increased internal loss due to carbon black. Preferred molding compositions contain 10-90 wt % of polyvinyl chloride or a vinyl chloride-vinyl acetate copolymer and 90-10 wt % of graphite flakes plus carbon black submicron particles. Carbon black is present in an amount of 0.1-2 parts per part of flaky graphite. Speaker diaphragms, arm pipes and head shells are fabricated from the molding composition. The composition is kneaded and rolled to orient the graphite flakes, and subsequently molded into an article, which is then optionally carbonized or graphitized.

A head shell for a record player tonearm comprises a composite material essentially consisting of a thermoplastic resin and graphite powder. The composite material is prepared by kneading the components, rolled to impart a degree of orientation to the graphite powder particles, which are in the form of flaky graphite and then molded into a shell, along the surface of which the graphite particles are oriented. Head shells wherein the composite material is oxidized at the surface and head shells wherein the composite material is carbonized or graphitized are also included. A light weight, rigid head shell having a high specific modulus of elasticity is obtained through a simple procedure at low cost.

Head shell for record player tonearms

An arm pipe for a record player tonearm comprises a composite material essentially consisting of a thermoplastic resin and graphite powder. The composite material is prepared by kneading the components, rolled to impart a degree of orientation to the graphite powder particles, which are in the form of flaky graphite and then molded into a pipe, along the surface of which the graphite particles are oriented. Arm pipes wherein the composite material is oxidized at the surface of the pipe and arm pipes wherein the composite material is carbonized or graphitized are also included. A light weight, rigid arm pipe having a high specific modulus of elasticity is obtained through a simple procedure at low cost.

Growing community of inventors

Tokyo, Japan

Yasuyuki Arai