US 8,151,725 B2Granted

Indicator apparatus

AssigneeNippon Seiki Co., Ltd.

InventorsHideki Masuda, Tatsuki Kawamura

Life of this patent

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Abstract

To provide an indicator apparatus in which a pointer is secured to a pointer drive means by attraction force of magnets and it is possible to prevent an overshoot and pulsation of the pointer with sufficient attraction force. The indicator apparatus has a display plate 21, a pointer 22 provided on a front-face side of the display plate 21, and a pointer drive means provided on a back-face side of the display plate 21 for rotating the pointer 22. The indicator apparatus includes first magnet 22c in a ring shape provided for the pointer 22 and a second magnet 23a provided for the pointer drive means to be opposite to the first magnet 22c, and the pointer 22 is rotated in association with rotation drive of the pointer drive means by attraction force of the first and second magnets 22c, 23a. A yoke 22d in a ring shape is located closer to a surface of the first magnet 22c that is not opposite to the second magnet 23a.

Claims11

Dependent claims

An indicator apparatus comprising:

a display plate,
a pointer provided on a front-face side of the display plate,
a pointer drive means provided on a back-face side of the display plate for rotating the pointer,
a first magnet in a ring shape provided for the pointer,
a second magnet provided for the pointer drive means opposite to the first magnet,
a yoke in a ring shape located closer to a surface of the first magnet that is not opposite to the second magnet,
a light-guide portion, which guides illumination light emitted from behind the pointer,
wherein:
the pointer is rotated in association with rotation drive of the pointer drive means by attraction force of the first and second magnets,
each of the first and second magnets includes two magnetized poles on its surface opposite to each other,
the yoke comprises a clearance portion,
the light-guide portion is located in the clearance portion, and
the clearance portion intersects magnetic field boundaries of the first magnet in a substantially perpendicular direction.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/531,931Filed 18 Mar 2008
Priority: JP 2007-07378021 Mar 2007
Published: US 2010/0064961 A118 Mar 2010
Granted: 10 Apr 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G01D 11/28
Component parts of measuring arrangements not specially adapted for a specific variable: structurally-combined illuminating devices
G01D 13/22
Component parts of indicators for measuring arrangements not specially adapted for a specific variable: pointers, e.g. settable pointer
B60K 2360/698
Features of instruments: pointers of combined instruments
G01D 2213/10
Indexing scheme relating to constructional details of indicators: drivers for gauges