Abstract: An optical recording medium includes: a substrate; an information recording layer formed on the substrate for recording and reproducing an information signal by irradiation with light; and a light transmission layer formed on the information recording layer and transmitting the light, the storage elastic modulus of the light transmission layer at ?5° C. being within a range of 1500 MPa or less.

Abstract: An optical recording medium includes: a substrate; an information recording layer formed on the substrate for recording and reproducing an information signal by irradiation with light; and a light transmission layer formed on the information recording layer and transmitting the light, the storage elastic modulus of the light transmission layer at ?5° C. being within a range of 1500 MPa or less.

Abstract: A disc cartridge including a cartridge body and a disc housed therein. The cartridge body has an aperture exposing part of the disc and a shutter to open and close the aperture. The shutter has a connecting arm extending from one side. An elastic moving piece extends along the connecting arm with the base end fixed to the free end of the connecting arm. The base end of the shutter has a movement guide piece with a window through which a pressing piece projects. A shutter movement limiting member pivots on the shutter to limit the shutter from opening when the aperture is closed by engaging an engagement portion on a movement limiter provided on the cartridge body. The shutter movement limiting member further pivots with the elastic moving piece to disengage the engagement portion from the movement limiter when a force is applied to the pressing piece.

Abstract: A disk cartridge is provided which includes an optical disk (2), a cartridge body (5) having formed therein a head opening (13) through which a part of the optical disk (2) is exposed to outside in a range between the inner and outer radii thereof, a shutter member (15) supported movably on the cartridge body (5) to uncover and cover the head opening (13), and a two-way forcing mechanism (38) to force the shutter member (15) toward any selected one of positions to cover and uncover the head opening (13). The two-way forcing mechanism (38) forces the shutter member (15) toward any selected one of the positions to cover and uncover the head opening (13) correspondingly to a position of the shutter member (15) relative to the head opening (13).

Abstract: A disk cartridge is provided which houses an optical disk rotatably. It includes a cartridge body having formed therein a head opening through which a part of the optical disk is exposed to outside, and a shutter member supported movably on the cartridge body to uncover and cover the head opening. A first concavity is formed on a side of the cartridge body over which the shutter member slides and in a region opposite to a region where the shutter member is moved, across the head opening, a bent portion is formed along one lateral side of the shutter member to close a gap resulted between the shutter member and first concavity when the shutter member has been moved to a position to cover the head opening, and a second concavity deeper than the first concavity is formed at a part of the first concavity, adjacent to the head opening.

Abstract: A disk cartridge is provided that has an optical disk (2) encased therein. It includes a cartridge body (5) having formed therein a head opening (13) through which a part of the disk, ranging from the inner to outer radius, is exposed to outside, a shutter member (21) including a shutter (22) that covers and uncovers the head opening and installed to the cartridge body to be movable between a position to cover the head opening and a position to uncover the head opening, and shutter movement limiter (41) provided on an elastic moving piece (36) coupled to a coupling arm (35) extending from one side of the shutter member and that is engaged on a movement limiter (45) provided on the cartridge body, when the shutter member is in a position to cover the head opening, to limit the shutter member from moving in a direction of uncovering the head opening.

Abstract: The present invention provides a disc cartridge, in which a shutter member can easily be installed to a cartridge body. The disc cartridge includes a body housing a rotatable disc, a driving aperture, a write and/or read aperture, and the shutter member. The shutter member includes a shutter plate portion, a movement guide piece, support pieces, a sliding guide portion, and engagement pieces. The shutter plate portion opens and closes the write/read aperture. The support pieces are spaced in a sliding direction of the shutter plate portion, are bent from the movement guide piece and supported on the sliding guide portion. The engagement pieces project towards the support pieces to the shutter plate portion holding the sliding guide portion between the engagement pieces and the support pieces. The sliding guide portion includes a guide recess and a guide rail portion. A tapered cut is formed in the guide recess.

Abstract: A disc cartridge reduced in size and thickness and yet exhibiting sufficient strength. The disc cartridge includes a main body unit of the cartridge including upper and lower halves in which is housed an optical disc. A tubular section is formed in one of two areas delimited by an upstanding peripheral wall section and a housing forming wall section formed on a lateral side of the lower half with the tubular section being in continuation to the upstanding peripheral wall section and the housing forming wall section. The upper half includes a tubular abutment support abutted against the tubular section with the tubular abutment support connecting to the upstanding peripheral wall section and the housing forming wall section of the upper half. The upper and lower halves are unified together to form the main body unit of the cartridge.

Abstract: A cartridge main body formed by aligning and bonding a pair of an upper half and a lower half rotatably contains an optical disc. The cartridge main body is provided on one of the opposite surfaces thereof with a central aperture, which is a drive aperture for receiving a drive means for driving the optical disc to turn, and a head receiving aperture, which is a recording and/or reproduction aperture for receiving a recording and/or reproduction means. A shutter member is fitted to the cartridge main body. The shutter member has a shutter section for exposing and closing the heard receiving aperture and is adapted to move to expose and close the head receiving aperture while it is supported at the base thereof within a range of one of the lateral sides thereof that is perpendicular to the above mentioned surface of the cartridge main body.

Abstract: A disk cartridge is provided that has an optical disk (2) encased therein. It includes a cartridge body (5) having formed therein a head opening (13) through which a part of the disk, ranging from the inner to outer radius, is exposed to outside, a shutter member (21) including a shutter (22) that covers and uncovers the head opening and installed to the cartridge body to be movable between a position to cover the head opening and a position to uncover the head opening, and shutter movement limiter (41) provided on an elastic moving piece (36) coupled to a coupling arm (35) extending from one side of the shutter member and that is engaged on a movement limiter (45) provided on the cartridge body, when the shutter member is in a position to cover the head opening, to limit the shutter member from moving in a direction of uncovering the head opening.

Abstract: A disk cartridge is provided which houses an optical disk (2) rotatably. It includes a cartridge body (5) having formed therein a head opening (13) through which a part of the optical disk (2) is exposed to outside, and a shutter member (15) supported movably on the cartridge body (5) to uncover and cover the head opening (13).

Abstract: The present invention provides a disc cartridge, in which a shutter member can easily be installed to a cartridge body.

Abstract: A shutter member can positively be unlocked.

Abstract: A disk cartridge is provided which includes an optical disk (2), a cartridge body (5) having formed therein a head opening (13) through which a part of the optical disk (2) is exposed to outside in a range between the inner and outer radii thereof, a shutter member (15) supported movably on the cartridge body (5) to uncover and cover the head opening (13), and a two-way forcing mechanism (38) to force the shutter member (15) toward any selected one of positions to cover and uncover the head opening (13). The two-way forcing mechanism (38) forces the shutter member (15) toward any selected one of the positions to cover and uncover the head opening (13) correspondingly to a position of the shutter member (15) relative to the head opening (13).

Abstract: A disc cartridge is formed by reliably bonding the upper and lower halves if the disc cartridge is downsized in order to adapt itself to a downsized disc. The disc cartridge comprises paired upper and lower halves for forming cartridge main body that contains an optical disc. Outer peripheral wall forming walls are arranged along the outer peripheries of the upper and lower halves and containing section forming walls are arranged on the inner surfaces of the upper and lower halves that are located vis-à-vis and matched with each other to produce a disc containing section. The lower half is provided with a disc driving aperture for receiving a rotary drive means and a recording and/or reproduction aperture.

Abstract: A disc cartridge reduced in size and thickness and yet exhibiting sufficient strength is disclosed. The disc cartridge includes a main body unit of the cartridge 5 made up by upper and lower halves 3, 4 in which is housed an optical disc 2. The lower half 4, forming one of the surfaces of the main body unit of the cartridge 5, includes a driving opening 12 and a recording and/or reproducing aperture 13. A first tubular section 27, including a first positioning hole 25, is formed in one of two areas delimited by an upstanding peripheral wall section 17 and a housing forming wall section 22 formed on a lateral side of the lower half 4, and a second tubular section 28, including a second positioning hole 26, is formed in the other area, with the second tubular section 28 being in continuation to the upstanding peripheral wall section 17 and/or the housing forming wall section 22.

Abstract: A cartridge main body formed by aligning and bonding a pair of an upper half and a lower half rotatably contains an optical disc. The cartridge main body is provided on one of the opposite surfaces thereof with a central aperture, which is a drive aperture for receiving a drive means for driving the optical disc to turn, and a head receiving aperture, which is a recording and/or reproduction aperture for receiving a recording and/or reproduction means. A shutter member is fitted to the cartridge main body. The shutter member has a shutter section for exposing and closing the heard receiving aperture and is adapted to move to expose and close the head receiving aperture while it is supported at the base thereof within a range of one of the lateral sides thereof that is perpendicular to the above mentioned surface of the cartridge main body.

Abstract: A recording/reproducing cassette equipped with an identification substrate is formed by joining together substantially rectangular upper and lower shells, with the identification substrate being placed therebetween at an appropriate position, wherein there is provided a temporary engagement device for maintaining the upper and lower shells in the joined state. The temporary engagement device consists of ribs or grooves or a combination of ribs and grooves provided on the upper and lower shells and/or the identification substrate.

Abstract: A tape cassette includes tape reels and a cassette main body formed of an upper shell and a lower shell. In such a tape cassette, a tape reel position restricting portion serving as a reinforcing member for the lower shell is provided on the lower shell at a position outside an outer periphery of the lower flange. The tape reel position restricting portion includes a high rib; an intermediate rib being lower than the high rib within a range not to obstruct passing of a tape end detecting light beam, and being positioned in a tape end detecting light path; and a low rib being lower than the intermediate rib, and being positioned in a tape path region. The intermediate rib and the low rib are preferably disposed outside the high rib.

Abstract: A tape cassette having a recording medium for use with a recording/reproducing device having a detection mechanism including a detection pin located in one of a plurality of positions and being adaptable for insertion into the tape cassette being currently used therewith so as to determine whether a recording operation may be performed involving the recording medium of the currently used tape cassette. The tape cassette includes a housing and a prevention plug. The housing includes first and second detection holes which are adapted to accommodate the detection pin and which are located so as to respectively correspond to the first and second positions.