What is claimed is:
1. A disc device comprising:
a rotatable table including a disc-receiving portion for receiving a surface of a disc, a protrusion for insertion into a center aperture of the disc, and a disc-holding means for elastically applying pressure to an inner peripheral edge surrounding the center aperture of the disc;
a pressing member opposing the disc-receiving portion of the rotatable table; and
a pressing driving means for driving at least one of the rotatable table and the pressing member in a direction in which the rotatable table and the pressing member move towards each other in a manner that causes the disc-holding means to engage the inner peripheral edge of the disc.
2. A disc device according to claim 1, wherein:
the pressing driving means is configured to drive the rotatable table toward the pressing member in a manner that causes the disc-holding means to engage the inner peripheral edge of the disc.
3. A disc device according to claim 1, wherein:
the pressing driving means is configured to drive the pressing member toward the rotatable table in a manner that causes the disc-holding means to engage the inner peripheral edge of the disc.
4. A disc device comprising:
a rotatable table including a disc-receiving portion for receiving a surface of a disc, a protrusion for insertion into a center aperture of the disc, and a disc-holding means for elastically applying pressure to an inner peripheral edge surrounding the center aperture of the disc;
a plate member opposing the disc-receiving portion of the rotatable table;
a driving chassis for supporting the rotatable table, the driving chassis being movable relative to the plate member; and
a pressing driving means for driving the rotatable table toward the plate member in a manner that causes the disc-holding means to engage the inner peripheral edge of the disc;
wherein a disc-passage space is formed between the plate member and the rotatable table when the plate member and the rotatable table are separated from each other; and
wherein the plate member functions as a guide plate for the disc that passes into the passage space.
5. A disc device according to claim 4, wherein:
the plate member includes an inner peripheral edge defining an aperture in the plate member; and
wherein the inner peripheral edge of the plate member is arranged to receive the protrusion of the rotatable table into the aperture, such that the disc is sandwiched by the disc-receiving portion of the rotatable table and the plate member.
6. A disc device according to claim 5, further comprising:
a housing;
a head for reproducing information from the disc andor recording information onto the disc;
a guiding portion for moving the driving chassis to a driving position in which the disc held by the rotatable table is completely accommodated inside the housing.
7. A disc device according to claim 4, wherein:
the driving chassis is movable between a clamping location in which the rotatable table opposes the plate member, and a driving location in which the disc held by the rotatable table is completely accommodated inside the housing.
8. A disc device as in claim 4, further comprising:
a pair of large-diameter-disc positioning members operable to position a large-diameter-disc relative to the rotatable table.
9. A disc device as in claim 9, further comprising:
a small-diameter-disc positioning means for positioning a small-diameter disc relative to the rotatable table, the small-diameter-disc positioning means being movable to a position in which the small-diameter-disc positioning means does not interfere with the movement of a large-diameter disc.
10. A disc device as in claim 4, further comprising:
an unclamping member operable to apply upward pressure to a bottom surface of the disc and to disengage the disc-holding means from the inner peripheral edge of the disc.
11. A disc device as in claim 10, further comprising:
an unclamping member support shaft rotatably supporting the unclamping member;
wherein the unclamping member further includes:
a pair of unclamping arms surrounding the periphery of the rotatable table; and
at least one unclamping protrusion mounted on a top surface of at least one of the unclamping arms, the unclamping protrusion configured to apply upward pressure on the bottom surface of the disc when the unclamping member is rotated about the unclamping member support shaft.
12. A disc device comprising:
a rotatable table including a disc-receiving portion for receiving a surface of a disc, a protrusion for insertion into a center aperture of the disc, and a disc-holding means for elastically applying pressure to an inner peripheral edge surrounding the center aperture of the disc;
a pressing member opposing the disc-receiving portion of the rotatable table;
a pressing member support shaft rotatably supporting the pressing member; and
a pressing driving means for driving the pressing member toward the rotatable table in a manner that causes the disc-holding means to engage the inner peripheral edge of the disc.
13. A disc device according to claim 12, wherein:
the pressing driving means further comprises a change-over means for forming a gap between the disc and the pressing member by moving the pressing member in a direction away from the rotatable table.
14. A disc device according to claim 13, wherein:
the gap between the disc and the pressing member is set such that the pressing member substantially prevents the disc from being removed from the holding means.
15. A disc device according to claim 14, further comprising:
a housing having an insertiondischarge opening formed therein;
a head for reproducing information from the disc andor recording information onto the disc;
a transporting means for supplying the disc between the rotatable table and the pressing member;
wherein the rotatable table, the pressing member, the head, and the transporting means are provided inside the housing.
16. A disc device according to claim 14, wherein the pressing member is elastically supported while the gap is set.
17. A disc device according to claim 13, wherein the inner peripheral edge of the disc is engaged by the disc-holding means as a result of the pressing member moving towards the rotatable table; and wherein the gap is formed as a result of the pressing member moving away from the rotatable table.
18. A disc device as in claim 12, further comprising:
an unclamping member operable to apply upward pressure to a bottom surface of the disc and to disengage the disc-holding means from the inner peripheral edge of the disc.
19. A disc device as in claim 18, further comprising:
an unclamping member support shaft rotatably supporting the unclamping member;
wherein the unclamping member further includes:
a pair of unclamping arms surrounding the periphery of the rotatable table; and
at least one unclamping protrusion mounted on a top surface of at least one of the unclamping arms, the unclamping protrusion configured to apply upward pressure on the bottom surface of the disc when the unclamping member is rotated about the unclamping member support shaft.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A flame-retardant resin composition comprising a resin component and a flame retardant;
wherein the resin component comprises a polyalkylene arylate-series resin and a styrenic resin, and
the flame retardant comprises a phosphazene compound and a phenolic resin, in which the phosphazene compound comprises at least one member selected from the group consisting of (1) a cyclic phenoxyphosphazene compound, (2) a linear phenoxyphosphazene compound, and (3) a crosslinked phenoxyphosphazene compound, as described below respectively:
(1) the cyclic phenoxyphosphazene compound
wherein m denotes an integer of 3 to 25, and Ph represents a phenyl group;
(2) the linear phenoxyphosphazene compound
wherein X1 represents the group \u2014N\u2550P(OPh)3 or the group \u2014N\u2550P(O)OPh, Y1 represents the group \u2014P(OPh)4 or the group \u2014P(O)(OPh)2, n denotes an integer of 3 to 10000, and Ph has the same meaning as defined in the formula (1);
(3) the crosslinked phenoxyphosphazene compound which is a compound formed by crosslinking at least one phenoxyphosphazene compound selected from the group consisting of the cyclic phenoxyphosphazene compound (1) and the linear phenoxyphosphazene compound (2) with at least one crosslinking group selected from the group consisting of o-phenylene group, m-phenylene group, p-phenylene group, and a bisphenylene group represented by the formula (3):
wherein A represents \u2014C(CH3)2\u2014, \u2014SO2\u2014, \u2014S\u2014 or \u2014O\u2014, and a denotes 0 or 1, and
wherein the crosslinking group is bonded to two oxygen atoms with elimination of phenyl groups of the phosphazene compound(s), and the content of the phenyl group of the crosslinked compound is, based on the total phenyl groups in at least one phosphazene compound selected from the group consisting of the phosphazene compounds (1) and (2), 50 to 99.9 mol%, and the crosslinked phenoxyphosphazene compound is free from a free hydroxyl group; and wherein
the phenolic resin comprises at least one member selected from the group consisting of an aminotriazine-modified phenol-novolak resin, a phenolic resin in which part or all of phenolic hydroxyl groups is changed into a glycidyl ether group, a high-ortho phenol-novolak resin, a monomerless novolak resin, and a dimerless novolak resin, and wherein
the amount of the styrenic resin is 1 to 50 parts by weight relative to 100 parts by weight of the polyalkylene arylate-series resin, and the amount of the phosphazene compound is 50 to 750 parts by weight relative to 100 parts by weight of the styrenic resin, and the amount of the phenolic resin is 20 to 1000 parts by weight relative to 100 parts by weight of the styrenic resin, and wherein
the resin composition further comprises at least one member selected from the group consisting of a nitrogen-containing compound, a phosphorus-series compound, a sulfur-containing compound, a silicon-containing compound, and an inorganic metal compound.
2. A composition according to claim 1, wherein the phosphazene compound comprises at least (3) the crosslinked phenoxyphosphazene compound.
3. A composition according to claim 1, wherein the polyalkylene arylate-series resin comprises at least one member selected from the group consisting of a polyethylene terephthalate-series resin and a polybutylene terephthalate-series resin.
4. A composition according to claim 1, wherein the amount of the flame retardant is 1 to 100 parts by weight relative to 100 parts by weight of the resin component.
5. A composition according to claim 1, wherein the ratio (weight ratio) of the phosphazene compound relative to the phenolic resin (phosphazene compoundphenolic resin) is 595 to 955.
6. A composition according to claim 1, wherein the flame retardant further comprises at least one component selected from the group consisting of a carbonizable resin and a nitrogen-containing compound.
7. A composition according to claim 1, which further comprises at least one member selected from the group consisting of an antioxidant, a heat stabilizer, a dripping inhibitor, a releasing agent, and a filler.
8. A flame-retardant resin composition comprising a resin component and a flame retardant,
wherein the resin component comprises a polyalkylene terephthalate-series resin and a styrenic resin,
the flame retardant comprises a phosphazene compound and a phenolic resin, and
the phenolic resin comprises at least one member selected from the group consisting of an aminotriazine-modified phenol-novolak resin, a phenolic resin in which part or all of phenolic hydroxyl groups is changed into a glycidyl ether group, a high-ortho phenol-novolak resin, a monomerless novolak resin, and a dimerless novolak
the amount of the flame retardant is 5 to 80 parts by weight relative to 100 parts by weight of the resin component,
the amount of the styrenic resin is 1 to 50 parts by weight relative to 100 parts by weight of the polyalkylene terephthalate-series resin, the amount of the phosphazene compound is 50 to 750 parts by weight relative to 100 parts by weight of the styrenic resin, and the amount of the phenolic resin is 20 to 1000 parts by weight relative to 100 parts by weight of the styrenic resin,
the weight ratio of the phosphazene compound relative to the phenolic resin is 2080 to 8020, wherein
the resin composition further comprises at least one member selected from the group consisting of a nitrogen-containing compound, a phosphorus-series compound, a sulfur-containing compound, a silicon-containing compound, and an inorganic metal compound, and wherein
the phosphazene compound comprises at least one member selected from the group consisting of (1) a cyclic phenoxyphosphazene compound, (2) a linear phenoxyphosphazene compound, and (3) a crosslinked phenoxyphosphazene compound, as described below respectively:
(1) the cyclic phenoxyphosphazene compound
wherein m denotes an integer of 3 to 25, and Ph represents a phenyl group;
(2) the linear phenoxyphosphazene compound
wherein X1 represents the group \u2014N\u2550P(OPh)3 or the group \u2014N\u2550P(O)OPh, Y1 represents the group \u2014P(OPh)4 or the group \u2014P(O)(OPh)2, n denotes an integer of 3 to 10000, and Ph has the same meaning as defined in the formula (1);
(3) the crosslinked phenoxyphosphazene compound which is a compound formed by crosslinking at least one phenoxyphosphazene compound selected from the group consisting of the cyclic phenoxyphosphazene compound (1) and the linear phenoxyphosphazene compound (2) with at least one crosslinking group selected from the group consisting of o-phenylene group, m-phenylene group, p-phenylene group, and a bisphenylene group represented by the formula (3):
wherein A represents \u2014C(CH3)2\u2014, \u2014SO2\u2014, \u2014S\u2014 or \u2014O\u2014, and a denotes 0 or 1, and
wherein the crosslinking group is bonded to two oxygen atoms with elimination of phenyl groups of the phosphazene compound(s), and the content of the phenyl group of the crosslinked compound is, based on the total phenyl groups in at least one phosphazene compound selected from the group consisting of the phosphazene compounds (1) and (2), 50 to 99.9 mol%, and the crosslinked phenoxyphosphazene compound is free from a free hydroxyl group.
9. A process for producing a flame-retardant resin composition, which comprises mixing a polyalkylene arylate-series resin, a styrenic resin and a flame retardant recited in claim 1.
10. A shaped article formed with a composition recited in claim 1.
11. A method for suppressing bleeding out of a flame retardant from a shaped article, wherein the shaped article is formed with a composition as recited in claim 1.
12. A flame-retardant resin composition according to claim 1, wherein the nitrogen-containing compound comprises at least one member selected from the group consisting of:
a salt of a nitrogen-containing cyclic compound having an amino group with a cyanuric acid or a derivative thereof, and
a salt of a nitrogen-containing cyclic compound having an amino group with an oxygen acid.
13. A flame-retardant resin composition according to claim 1, wherein the nitrogen-containing compound comprises at least one member selected from the group consisting of:
a salt of an amino group-containing triazine with a cyanuric acid, and
a salt of an amino group-containing triazine with a polyphosphoric acid.
14. A flame-retardant resin composition according to claim 1, wherein the phosphorus-series compound comprises at least a metal salt of an organic phosphinic acid.