초록 ▼

A liquid level indicator for detecting a liquid level by utilizing the variation inductance of a coil having a core made of an electrical insulating magnetic material and provided inside a winding of the coil. The core may be made by piling a plurality of thin, plate-shaped conductive materials one

A liquid level indicator for detecting a liquid level by utilizing the variation inductance of a coil having a core made of an electrical insulating magnetic material and provided inside a winding of the coil. The core may be made by piling a plurality of thin, plate-shaped conductive materials one on another in the cross-sectional direction of the coil so that they are insulated from each other or by winding a conductive magnetic material at least one turn in the form of a roll so that a closed loop current is not formed in the cross-sectional direction of the coil. An eddy current loss of the core so arranged is so small that it can be disregarded. Furthermore, the winding component of the core itself is substantially released in the equivalent circuit of the coil.

대표청구항 ▼

A liquid level indicator for detecting a liquid level, comprising: a coil having a core extending in a longitudinal direction in said coil, said core being formed of conductive magnetic material disposed in said coil such that a plurality of magnetic material layers are formed in a direction perpend

A liquid level indicator for detecting a liquid level, comprising: a coil having a core extending in a longitudinal direction in said coil, said core being formed of conductive magnetic material disposed in said coil such that a plurality of magnetic material layers are formed in a direction perpendicular to the longitudinal direction of said coil, said magnetic material layers being electrically insulated from one another in the direction perpendicular to the longitudinal direction, and said coil further having a single winding wound around said core; an electrically conductive ring member fitted on said coil so as to be movable along the longitudinal direction thereof in response to a liquid level, the inductance of said coil being varied in response to the movement of said conductive ring member with respect to said coil; and means for detecting the variation in the inductance of said coil in response to said movement of said conductive ring member.