Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
129 words
An information memory medium adapted to be driven by a drive mechanism (12) having a turntable (54) for rotating said medium and a magnetic attraction member (60) for magnetically attracting said medium to said turntable (54), said information memory medium comprising: a body (16) having a disk-like base plate (18), and a recording portion (20) for recording information; characterized by further comprising a centering member (24), provided on the center portion of said body and having projecting members (36), for centering said body (16) on the turntable (54); and a magnetic member (26) attached to said centering member (22) and adapted to be attracted to the magnetic attraction member (60), said magnetic member (26) having openings (38) into which the projections (36) of said centering member (24) are fitted.
Claim 2
Dependent Claim
129 words
An information memory medium adapted to be driven by a drive mechanism (12) having a turntable (54) for rotating said medium and a magnetic attraction member (60) for magnetically attracting said medium to said turntable (54), said information memory medium comprising: a body (16) having a disk-like base plate (18), and a recording portion (20) for recording information; characterized by further comprising a centering member (24), provided on the center portion of said body and having projecting members (36), for centering said body (16) on the turntable (54); and a magnetic member (26) attached to said centering member (22) and adapted to be attracted to the magnetic attraction member (60), said magnetic member (26) having openings (38) into which the projections (36) of said centering member (24) are fitted.
Claim 3
Dependent Claim
27 words
An information memory medium according to claim 1, characterized in that said centering member (24) has substantially the same thermal expansion coefficient as said base plate (18).
Claim 4
Dependent Claim
40 words
An information memory medium according to claim 2, characterized in that said projecting members (36) comprise a support (30b) connected at one end to said centering member, and a detent (36a) connected to the other end of said support (36b).
Claim 5
Dependent Claim
44 words
An information memory medium according to claim 3, characterized in that the diameter of the support (36b) is smaller than that of the opening, the diameter of the detent is larger than that of the opening, and the support is engaged with the opening.
Claim 6
Dependent Claim
36 words
An information memory medium according to claim 4, characterized in that said detent (36a) has an elastically deformable body, and is inserted in the engaging hole (38), thereby engaging the support (36b) with the engaging hole.
Claim 7
Dependent Claim
34 words
An information memory medium according to claim 4, characterized in that said detent (36a) is formed by inserting the projecting member (36) into the opening and then machining the end of the projecting member.
Claim 8
Dependent Claim
27 words
An information memory medium according to claim 1, characterized in that said magnetic member (26) has an annular body and provided coaxially with the center hole (24a).
Claim 9
Dependent Claim
87 words
An information memory medium according to claim 7, characterized in that said centering member (24) has, in the surface thereof, an annular recess (34) coaxial with the center hole (24a), said magnetic member has an annular projection (32) extending along the circumferential direction thereof, said projecting member (36) is formed on the bottom of the recess (34), said engaging hole is formed in the projection (32), and said magnetic member (26) is attached to the centering member (24), with the projection (32) engaged with the recess (34).
Claim 10
Dependent Claim
25 words
An information memory medium according to claim 8, characterized in that three projecting members (36) and three engaging openings (38) are formed at equal intervals.
Claim 11
Dependent Claim
36 words
An information memory medium according to claim 8, characterized in that the end of said projecting member (36) is receding from the outer surface of that portion of the magnetic member (26) other than the projection.
Claim 12
Dependent Claim
27 words
An information memory medium according to claim 1, characterized in that said centering member (24) has a projection (28) fitted in the through-hole of said base plate.
Claim 13
Dependent Claim
25 words
An information memory medium according to claim 11, characterized in that said projection (28) has a height less than the thickness of the base plate.
Claim 14
Dependent Claim
58 words
An information memory medium according to claim 1, characterized in that said body (16) further comprises another base plate (18), a recording portion (20) formed on this other base plate (18), and a spacer (21), and two base plates (18) are bonded, with the spacer (21) interposed therebetween, such that the information recording portions (20) face each other.
Claim 15
Dependent Claim
19 words
An information memory medium according to claim 1, characterized in that said centering member (24) has an annular body.