Nippondenso Co., Ltd.

Toru Nakashima

Haruhiko Inoue

Yoshifumi Ina

Hirofumi Iwata

Sigeki Furuta

Masashi Miyamoto

Koji Umemura

A fuel pump of regenerative type mounted in a fuel tank. The fuel pump has a pump housing defining a pump chamber, an impeller rotatably mounted in the pump housing and provided with a multiplicity of blades formed thereon, and a driving device for driving the impeller. The fuel pump further has a vapor relief port for relieving, from the pump chamber into the space in the fuel tank, vapor of fuel generated as a result of rotation of the impellar, and a vapor relief extension passage connected to the vapor relief port and opening at least one end in the space in the fuel tank.

Fuel pump with passage for attenuating noise generated by impeller

A 1-bit microcomputer driven by a clock signal has first and second output ports. The signals from these output ports control first and second transistors whose output signals are supplied to step-up transformers. The output signals from these transformers drive the sounding devices constructed of piezoelectric elements to produce a chord sound. The memory of the microcomputer stores a program by which first and second square-wave pulse-train signals formed of a combination of a plurality of square wave pulses and in which each unit pulse train has a mutually different basic frequency are output from the first and second output ports.

Warning chord sound producing apparatus including an integrated circuit

A sound generating apparatus using piezoelectric elements includes first and second sounding plates arrayed in parallel with each other. The first and second sounding plates respectively include first and second diaphragms, and first and second thin plate-like piezoelectric elements laminated onto the first and second diaphragms. The first and second sounding plates are coupled together at the outer peripheral portions by a ring, thereby forming a hermetically sealed internal air chamber. The first and second sounding plates coupled together by the ring, and containing the internal air chamber cooperate to form a sounding member. The sounding member is supported by means of four resilient supporting members made of, for example, rubber, in a housing. In the housing, a front air layer and a rear air layer are formed on both sides of the sounding member, respectively. The front and rear air layers communicate with each other through a ringlike sound path. A plurality of sound passing holes are distributed closer to the outer periphery portion, while confronting the front air layer. A drive circuit applies a drive voltage signal in parallel to the first and second sounding plates.

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Kariya, Japan

Toru Nakashima