Meter
AssigneeYazaki Corporation
InventorShigeki Totsuka
Life of this patent
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Abstract
A hollow box-shaped mover or a needle is moved, without using a power transmission mechanism midway, to a portion according to a measured value of a graduation portion, by housing the mover between a dial and a surrounding facing and in a guide groove portion formed along a graduation portion, in a manner to move along the guide groove portion, by attaching a needle to the mover, and by moving the mover along the guide groove portion by a linear motor unit, which is constituted to have a multipolar magnet of the guide groove portion and two coils housed in the mover.
Claims7
A centerless meter for indicating a position of a graduation portion arranged on a dial associated with a measured value, with a needle extending from an outer side to an inner side of said graduation portion, comprising:
- a guide groove portion formed in the outer side of said dial and extending along said graduation portion;
- a mover housed in said guide groove portion so as to be movable along said guide groove portion;
- said needle attached to said mover;
- and
- a moving device for moving said mover relative to said guide groove portion and along said guide groove portion,
- wherein said moving device includes:
- a multipolar magnet attached to a first member that is one of said guide groove portion and said mover and having at least one set of N-poles and S-poles arranged adjacent to each other;
- a coil attached to a second member that is the other of said guide groove portion and said mover for generating magnetic poles at the poles arranged to confront said multipolar magnet;
- and
- a power source for switchably energizing said coil such that magnetic poles are generated alternately over successive ones of the poles;
- and
- said multipolar magnet or said coil attached to said guide groove portion are arranged in said guide groove portion over a whole moving range in which said mover moves in the guide groove portion.
Dependencies are inferred from the claim text.