Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
An encoder with a position detecting device including a rotating body (2) provide on a surface thereof with a magnetic material (24), and magnetoresistive elements (30, 31, 32, 33) disposed opposite to and in close proximity to said magnetic material (24), comprising: an encoding track (20) provided on said rotating body (2) and containing a magnetic signal recorded in a predetermined direction of magnetization; a position detecting track (21, 22, 23) provided on said rotating body (2) and containing a magnetic signal recorded in a direction of magnetization, said direction of magnetization intersecting with said predetermined direction of magnetization; and magnetoresistive elements (30, 31, 32, 33) formed on an insulating substrate (3) and facing said encoding track and said position detecting track, said magnetoresistive elements being arranged side by side in a track arranging direction, each of said magnetoresistive elements being placed so as to intersect the direction of magnetization in a track (20, 21, 22, 23) facing said magnetoresistive element.
Claim 2
Dependent Claim
161 words
An encoder with a position detecting device including a rotating body (2) provide on a surface thereof with a magnetic material (24), and magnetoresistive elements (30, 31, 32, 33) disposed opposite to and in close proximity to said magnetic material (24), comprising: an encoding track (20) provided on said rotating body (2) and containing a magnetic signal recorded in a predetermined direction of magnetization; a position detecting track (21, 22, 23) provided on said rotating body (2) and containing a magnetic signal recorded in a direction of magnetization, said direction of magnetization intersecting with said predetermined direction of magnetization; and magnetoresistive elements (30, 31, 32, 33) formed on an insulating substrate (3) and facing said encoding track and said position detecting track, said magnetoresistive elements being arranged side by side in a track arranging direction, each of said magnetoresistive elements being placed so as to intersect the direction of magnetization in a track (20, 21, 22, 23) facing said magnetoresistive element.
Claim 3
Dependent Claim
26 words
An encoder with a position detecting device according to Claim 1, wherein said direction of magnetization and said predetermined direction of magnetization intersect at right angles.
Claim 4
Dependent Claim
56 words
An encoder with a position detecting device according to Claim 1, wherein said rotating body (2) is attached to the rotating shaft (1) of a brushless motor, and the position detecting track is divided into a plurality of tracks (21, 22, 23), the number of which corresponds to the number of phases of the brushless motor.
Claim 5
Dependent Claim
59 words
An encoder with a position detecting device according to Claim 3, wherein, in each of said position detecting tracks, a magnetic signal is recorded at intervals corresponding to the electrical angle of 180 0 in P/2 recorded areas (211, 221, 231) and P/2 unrecorded areas (210, 220, 230), where P indicates the number of poles of the brushless motor.
Claim 6
Dependent Claim
92 words
An encoder with a position detecting device according to Claim 3, wherein a magnetic signal is recorded in said encoding track (20) along the circumference of said rotating body (2), and a magnetic signal is recorded in each of said position detecting tracks (21, 22, 23) in directions perpendicular to the circumference of said rotating body (2), and wherein the direction of a magnetoresistive element (30) facing said encoding track (20) is perpendicular to the direction of each of magnetoresistive elements (31, 32, 33) facing said position detecting tracks (21, 22, 23).
Claim 7
Dependent Claim
64 words
An encoder with a position detecting device according to Claim 3, wherein the polarity of magnetic signal in a portion of a first one (21) of said position detecting tracks (21, 22, 23) is equal to the polarity of magnetic signal in that portion of a second position detecting track (22) which is adjacent to said portion of said first position detecting track (21).