US 5,467,769 A · Magnetic field generating apparatus

Abstract

A magnetic field generating apparatus has a permanent magnet arrangement for generating a magnetic field in a magnetic field generating space and a yoke arrangement for forming magnetic circuits for generation of the magnetic field together with the permanent magnet arrangement. The yoke arrangement includes a first pair of yokes arranged facing each other, a second pair of yokes arranged facing each other through which the first pair of yokes are magnetically connected to each other, a third pair of yokes arranged between one end of one of the first pair of yokes and one end of one of the second pair of yokes and between the other end of the one of the first pair of yokes and one end of the other of the second pair of yokes, respectively, and yoke moving units for independently moving the one of the first pair of yokes and each of the second pair of yokes with respect to the third pair of yokes, respectively.

Claims15

Dependent claims

A magnetic field generating apparatus having a magnetic field generating space, comprising a permanent magnet arrangement for generating a magnetic field in the magnetic field generating space and a yoke arrangement forming magnetic circuits for generation of the magnetic field together with the permanent magnet arrangement, the yoke arrangement including:

(1) a first pair of yokes arranged so as to face each other;
(2) a second pair of yokes arranged so as to face each other and through which said first pair of yokes are magnetically coupled to each other;
(3) a third pair of yokes arranged between one end of one yoke of said first pair of yokes and one end of one yoke of said second pair of yokes and between the other end of said one yoke of said first pair of yokes and one end of the other yoke of said second pair of yokes, respectively;
and
(4) yoke moving means for independently moving said one yoke of said first pair of yokes and each yoke of said second pair of yokes with respect to said third pair of yokes, respectively.

2 more elements

A magnetic field generating apparatus having a magnetic field generating space, comprising a permanent magnetic arrangement for generating a magnetic field having a predetermined direction in the magnetic field generating space and a yoke arrangement forming magnetic circuits for generation of the magnetic field together with the permanent magnet arrangement, the permanent magnet arrangement including a pair of permanent magnets arranged facing each other in the predetermined direction, and the yoke arrangement including:

(1) a first pair of yokes arranged so as to face each other, the first pair of yokes supporting said pair of permanent magnets, respectively;
(2) a second pair of yokes arranged so as to face each other and through which said first pair of yokes are magnetically coupled to each other;
(3) a third pair of yokes arranged between one end of one yoke of said first pair of yokes and one end of one yoke of said second pair of yokes and between the other end of said one yoke of said first pair of yokes and one end of the other yoke of said second pair of yokes, respectively;
and
(4) yoke moving means for independently moving said one yoke of said first pair of yokes in said predetermined direction and each of said second pair of yokes in a direction transverse to said predetermined direction with respect to said third pair of yokes, respectively.

2 more elements

Dependencies are inferred from the claim text.

Magnetic field generating apparatus

Life of this patent

Magnetic field generating apparatus

Life of this patent

Abstract

Claims15