Nippon Seiki Co., Ltd.

Toshiyuki Ohtake

Koichi Sato

Yukio Ogasawara

Tetsuro Togawa

Hiroshi Todoroki

Shuichi Nomizu

Hideki Zaima

An instrumental device is provided which includes a variable display portion and a pointer moving around the variable display portion and achieves excellent response and resistance to vibration without complicating the shape of a member. The instrumental device has a display platehaving a variable display portion, a pointermoving around the variable display portion, and pointer drive meansprovided on the back-face side of the display platefor moving the pointer. The instrumental device includes a guide rail portionprovided in the display plateto surround the periphery of the variable display portion, the pointerbeing located on the guide rail portion, a holding portionholding the pointermovably along the guide rail portion, a first magnetprovided in the pointeror the holding portion, and a second magnetprovided in the pointer drive meanssuch that the second magnetis opposite to the first magnet

Instrumental device

A moving magnet type indicating instrument comprising a moving magnet type instrument, a counter mechanism, a drive unit, and a frame body produced of a synthetic resin. The magnet type indicating instrument includes a magnet mounted in bobbins produced of the synthetic resin, a needle shaft fixed to the magnet, and a coil wound at an angle on the bobbins. The bobbins are housed in a magnetic shield case and the coil is electrically connected to terminals provided on the bobbins. The counter mechanism, including a total counter and reset counter having a zero-resetting device, is mounted on the frame body. The drive unit comprises a case including a step motor for driving the counter mechanism and a groove of gears, and is fixed to the frame body. Terminals for the moving magnet type indicating instrument and the drive unit are inserted and connected to the connectors provided on a printed-circuit board. Therefore, it is possible to easily electrically connect and fix the moving magnet type indicating instrument and the drive unit to the connectors on the printed-circuit board through these terminals.

Moving magnet type indicating instrument combined with a counter

In the moving magnet type meter of the present invention, the coil mounting portions of a bobbin body are projected outwards in a generally arched shape on the central side to form circular arc-like or inclined surfaces, whereby the bobbin body can be made strong against the external pressure induced by the mounting of coils thereon and can be prevented from being deformed. Further, the upper portion of a movable magnet is centrally formed with an upwardly projecting shaft support portion for supporting a pointer shaft, and a thrust bearing portion is formed in the lower surface of an upper bobbin body portion in an opposed relation to the upper end face of the said shaft support portion through a predetermined slight gap, whereby the pointer shaft can be formed in the shape of a straight rod without forming a reduced-diameter portion serving as a thrust bearing, so the fabrication of the pointer shaft is easy and it is possible to maintain the strength of the pointer shaft itself.

Growing community of inventors

Niigata, Japan

Toshiyuki Ohtake