Card including rotatory system optical recording medium

A card including a rotatory system optical recording medium, comprising a rotatory optical recording medium, a case body having a holding space which releasably holds said optical recording medium, and a protective cover which protects the surface of said optical recording medium when said optical recording medium is held on said case body, said case body including opening means for opening the protective cover from a first position in which it protects the surface of the optical recording medium to a retracted position in which an opening portion is formed, said optical recording medium being releasable from and returnable to the case body through the opening portion, wherein said opening means comprises a supporting rod fitted with a freely rotatable protective cover.

A card including a rotatory system optical recording medium, comprising a rotatory optical recording medium, a case body having a holding space which releasably holds said optical recording medium, and a protective cover which protects the surface of said optical recording medium when said optical recording medium is held on said case body, said case body including opening means for the protective cover from a first position in which it protects the surface of the optical recording medium to a retracted position in which an opening portion is formed, said optical recording medium being releasable from and returnable to the case body through the opening position, wherein at least one stepped difference and/or taper for prevention of drop-off from the case body is provided on a part of the rotatory system optical recording medium.

A card including a rotatory system optical recording medium, comprising a rotatory optical recording medium, a case body having a holding space which holds said optical recording medium freely detachably, and a protective cover which protects the surface of said optical recording medium held on said case body, said case body being provided with opening means for the protective cover so that said optical recording medium can be detached from said holding space;

• wherein in the rotatory system optical recording medium, said protective cover is held on said case body by having said opening means comprising a freely slidable guide groove provided on the case body, in which the protective cover can be slided freely, the optical recording medium being detachable in the vertical direction of said holding space, and at least one stepped difference being provided on said optical recording medium, the thickness of said step being smaller than the distance from the light incident surface of said optical recording medium to the recording layer.

A card including a rotatory system optical recording medium comprising a rotatory optical recording medium, a case body having a holding space which holds said optical recording medium freely detachably, and a protective cover which protects the surface of said optical recording medium held on said case body, said case body being provided with opening means for the prtective cover so that said optical recording medium can be detached from said holding space;

• wherein at least one stepped difference and/or taper for prevention of drop-off from the case body is provided on a part of the rotatory optical recording medium;
• wherein in the rotatory system optical recording medium, said protective cover is held on said case body by having said opening means comprising a freely slidable guide groove provided on the case body, in which the protective cover can be slided freely, the optical recording medium being detachable in the vertical direction of said holding space, and at least one stepped difference being provided on said optical recording medium, the thickness of said step being smaller than the distance from the light incident surface of said optical recording medium to the recording layer.

A card including a rotatory system optical recording medium, comprising a rotatory optical recording medium, a case body having a holding space which releasably holds said optical recording medium, and a protective cover which protects the surface of said optical recording medium when said optical recording medium is held on said case body, said case body including opening means for the protective cover from a first position in which it protects the surface of the optical recording medium to a retracted position in whicn an opening portion is formed, said optical recording medium being releasable from and returnable to the case body through the opening portion, wherein the card has a locking means for the protective cover which is released when being set on the recording and/or reproducing device and said opening means comprising a supporting rod fitted freely rotatably with said protective cover.