KR100512575B1 - Optical disc and disc cartridge - Google Patents

Abstract

An optical disc and a disc cartridge equipped with an optical disc. The disc cartridge mounts a disc that is asymmetric in cross section with respect to the thickness of the disc. The disc cartridge includes a cartridge body portion and an opening / closing device. The cartridge body portion has a hole for inserting or ejecting the disk. The cartridge body portion is configured to mount the disc only in a normal state of the disc capable of recording and / or playing back the disc. The open / close device opens or closes the hole.

Description

Optical disc and disc cartridge

The present invention relates to optical discs and disc cartridges. In particular, the present invention relates to a disc cartridge using an optical disc and two disc substrates.

In recent years, in keeping with the increasing recording density of the information signal, single-junction optical discs in which two disc substrates of optical discs such as compact discs (CDs) or magneto-optical discs are each formed of a single disc are bonded together for forming a single disc. This bonded disk is composed of two disk substrates of the same design specification with the signal recording surface facing outward. This signal recording surface is formed on the front and back of the bonded disk.

Among the bonded disks, the signal recording layer is formed on only one disk substrate, while the other disk substrates serve to secure the mechanical strength of the designated disk substrate first. The bonded optical disc is mounted in a disc cartridge for recording and / or reproducing an information signal by a recording and reproducing apparatus.

The disc cartridge comprises a main body portion consisting of halves of a pair of cartridges, that is, a thin plate-shaped upper cartridge half and a lower cartridge half joined to each other adjacently.

The inside of the cartridge body portion is formed with a disc housing portion thicker than the optical disc, larger than the outside size of the disc, and limited by an arcuate upright wall. This disc is fitted to rotate in the disc housing.

The upper and lower surfaces of the cartridge body portion extend from the center portion to the front surface at the center portion in the left and right directions of the cartridge body portion to form recording and / or reproducing holes. This recording and / or reproducing hole causes the recording area portion of the disc inserted in the cartridge body portion to be exposed to the outside.

On the cartridge body, a shutter having a generally U-shaped actual cross section is formed to be able to slide. The shutter is constituted by a pair of shutter portions sized to close the recording and / or reproducing holes, and a connecting portion connecting the shutter portions to each other. This shutter closes the recording and / or reproducing apparatus only when the disc cartridge is installed in the recording and / or reproducing apparatus, otherwise the recording and / or reproducing hole is left open. During use, the shutter prevents dirt or contaminants from entering the cartridge body and at the same time keeps the disc out of the recording area.

The bonded optical disc is inconvenient in that a deviation occurs between the relative positions of the disc substrates when the disc substrates are joined together in this state of production.

Due to the positional deviation caused by the joining, the inner size portions E1 and E2 of the center holes of the two disk substrates 420A and 420B represent the inner size E3 of the center hole of the bonded optical disk 420. As a result, in joining the disk substrates 420A and 420B to each other, a reference shaft of the center jig passes through the center hole of the disk substrates 420A and 420B for mounting.

3, when the bonded optical disc is inserted into the disc housing portion 422 of the disc cartridge 421, the necessary distance between the inner peripheral wall portion of the disc insertion portion 422 and the outer frame of the bonded optical disc 420 is shown. The problem arises that it is difficult to secure.

In a disc cartridge, a double-sided disc provided with recording areas on each side of the disc substrate may be inserted therein so that the disc capacity is increased so that both front and rear surfaces of the disc substrate serve as recording and / or reproducing surfaces. Disc cartridges for inserting discs configured to insert or take out discs from cartridges have been proposed.

The disc cartridge is configured such that once recording and / or reproducing of the information signal on one of its recording surfaces is finished, the disc cartridge is ejected from the apparatus once, and upside down and reinserted through the cartridge insertion hole of the recording and / or reproducing apparatus. .

 In a disc cartridge in which the recording and / or reproducing disc is inserted therein, if recording and / or reproducing is completed and the next disc is recorded and / or played, a new disc is recorded and / or reproducing. Must be exchanged with Since the disc is configured to have a size outside the shame, it is difficult to distinguish the recording and / or playback surface desired by the user, so that the disc is usually inserted in the disc cartridge in a wrong state.

For example, if a disc is installed in a disc cartridge with a recording and / or reproducing side different from the desired side set as the reproducing side, the disc cartridge is installed in the recording and / or reproducing apparatus for recording / reproducing in this state. As a result, necessary information signals are inadvertently erased.

It is therefore an object of the present invention to provide an optical disc which solves the above problem.

Another object of the present invention is to provide a disc cartridge which solves the above problem.

An optical disc according to the present invention includes first and second disc substrates. The first disc substrate has a recording layer and is composed of a first center hole. The second disc substrate has a recording layer and is composed of a second center hole. The second disc substrate is bonded to the first disc substrate so that each recording layer faces each other. The first center hole or the second center hole has a larger diameter than the remaining center holes.

An optical disk according to the present invention includes first and second disk substrates. The first disc substrate has a reflective layer and is composed of a first center hole. The second disc substrate has a reflective layer and is composed of a second center hole. The second disc substrate is bonded to the first disc substrate so that each reflective layer faces each other. The first center hole or the second center hole has a larger diameter than the remaining center holes.

The disc cartridge according to the present invention provides a disc made by joining two disc substrates together. This disc is asymmetrical in cross section with respect to the joint surface as a center. The disc cartridge is composed of a cartridge body portion and an opening and closing device. The cartridge body portion has a hole through which the disc is inserted or removed, and is configured to provide the disc only in a normal state of recording and / or playing back the disc. The switchgear opens or closes the hole.

The disc cartridge according to the present invention is asymmetric in cross section with respect to the center of the thickness of the disc. The disc cartridge includes a cartridge body portion and an opening and closing device. The apparatus main body has a hole through which the disc is inserted or removed, and is configured to provide the disc only in a normal state of recording and / or playing back the disc. The switchgear opens or closes the hole.

Disc cartridge according to the present invention is composed of a cartridge body portion, opening and closing device, release preventing device. The switchgear opens or closes the hole. The opening and closing operation of the opening and closing device is prevented when the prevention device indicates a state of preventing writing to the disc. The release preventing device indicates whether or not recording on the disc is possible and prevents the disc from being ejected from the cartridge body portion in the write-protection state. The release preventing device is installed in the apparatus body part.

An optical disc and a disc cartridge according to the present invention will be described with reference to the drawings.

First, the optical disc according to the present invention will be described.

The optical disc 1 according to the first embodiment of the present invention is composed of a first disc substrate 1A and a second disc substrate 1B bonded to the first disc substrate 1A as shown in Figs. .

The first disc substrate 1A is formed of a disc having a center hole made of a material such as a photoconductive synthetic resin. The first disc substrate 1A is a recording layer made of aluminum, for example, and has a ring-shaped signal recording area S covered with a protective layer of a synthetic resin such as a reflective layer and an ultraviolet curable resin. The protective layer is formed on one of the main surfaces to cover the entire upper surface of the reflective layer. If the optical disc 1 is a read-only optical disc, the reflective layer is formed of aluminum, for example. By the way, if the optical disc is a recording disc, it is formed of an optical disc recording material.

The second disc substrate 1B is made of a synthetic resin such as polycarbonate resin and is formed of a disc having a center hole 1E. By bonding to the first substrate, the second disc substrate 1B acts as a support plate for maintaining the mechanical strength of the first disc substrate 1A. Similarly to the first disk substrate 1A, the second disk substrate 1B is provided with a reflective layer and a protective layer. In this case, the second disk substrate 2B is bonded to the first disk substrate 1A so that each reflective or protective layer faces each other.

The second disc substrate 1B has an internal size D3 whose central hole is larger than the internal size of the center hole 1D of the first disc substrate 1A and the external size D2 of the first disc substrate 1A. It is formed to have a smaller outer size (D4). The optical disc 1 is formed on the outer circumferential surface together with the stage 1C, as shown in FIG.

The second disc substrate 1B has a larger internal size of the center hole 1E than the internal size of the central hole of the first disc substrate 1A or an external diameter of the second optical disc 1A. The smaller than the outer diameter is made to be greater than or equal to the positional deviation produced when joining.

In the optical disc 1, a state where the first disc substrate 1A and the second disc substrate 1B are bonded together will be described. First, a reference shaft of a jig in the center is inserted through the center holes 1D and 1E of the first disc substrate 1A and the second disc substrate 1B, respectively, to determine the position. After the relative position with respect to each other is determined, the first disc substrate 1A and the second disc substrate 1B are bonded with an ultraviolet curable adhesive. The ultraviolet curable resin is precoated on at least one of the main surfaces of the first or second disc substrate. After the relative position is determined as described above, ultraviolet rays are emitted from the second disc substrate side in order to harden the ultraviolet curing adhesive.

In the optical disc 1 according to the first embodiment, since the internal size D1 of the center hole of the first disc substrate 1A is smaller than the internal size of the center hole of the second disc substrate 1B, the first size is smaller than the first size. When the external size D2 of the disk substrate 1A is larger than the external size of the second disk substrate 1B, the positional deviation occurring at the time of joining can be prevented. The center hole 1F of the optical disc 1 is formed as described above to become the center hole 1D of the first disc substrate 1A.

With this optical disc 1, it is possible to reliably prevent the internal size D1 of the central hole 1D from becoming smaller than the internal size D1 or D3 of the central hole 1E of the second disc substrate 1B. At the same time, it is possible to reliably prevent the external size D2 of the center hole 1D from becoming larger than the external sizes D2 and D4 of the second disc substrate 1B.

With this optical disc 1, it is possible to provide a necessary space between the outer frame of the disc and the inner wall portion of the disc housing portion of the disc cartridge, which will be described later.

The optical disc 2 according to the second embodiment of the present invention has a second disc substrate bonded to the first disc substrate 2A and the first disc substrate 2A, as shown in Figs. (2B).

The first disc substrate 2A is formed of a disc having a central hole of a photoconductive synthetic resin such as polycarbonate resin. The first disc substrate 2A is a recording layer made of aluminum, for example, and has a ring-shaped signal recording area S covered with a protective layer made of synthetic resin such as a reflective layer and an ultraviolet curable resin. The protective layer is entirely formed on one of the main surfaces of the first disc substrate 2A to cover the upper main surface of the reflective layer. If the optical disc 2 is a recording optical disc, a recording layer made of an optical recording material is provided in place of the aluminum reflective layer.

The second disc substrate 2B is formed of a disc having a central hole of a synthetic resin such as polycarbonate resin. By bonding to the first disc substrate 2A, the second disc substrate 2B acts as a support for maintaining the mechanical strength of the first disc substrate 2A. As in the first embodiment, the second disc substrate 1B is provided with a reflective layer and a protective layer. In this case, the second disc substrate 2B is bonded to the first disc substrate 2A so that each reflective layer or protective layer faces each other.

The second disc substrate 2B has an internal size D7 whose center hole is larger than the internal size D5 of the center hole 2D of the first disc substrate 2A, and the external diameter of the disc substrate 2A ( It is formed to have a larger outer diameter (D8) than D6). As shown in Fig. 9, the optical disc 2 is formed on the outer circumferential surface together with the stage 2C.

In the optical disc 2, a state in which the first disc substrate 2A and the second disc substrate 2B are bonded to each other will be described. First, the reference shaft of the jig in the center (not shown) is used as a reference to determine the position of the external size of the second disk substrate 2B as the center hole 2D of the first disk substrate 2A as a reference. It is inserted through the center hole 2D of 2A). After the relative position is determined, the first disc substrate 2A and the second disc substrate 2B are bonded together using an ultraviolet curing adhesive.

In the optical disc 2 according to the second embodiment, the internal size D7 of the center hole 2E of the second disc substrate 2B is larger than the internal size of the center hole 2D of the first disc substrate 2A. Therefore, when the external size D8 of the first disc substrate 2A is larger than the external size D6 of the first disc substrate 2A, the difference in external size relative to the internal size of the second disc substrate 2B is determined. The inner size of the center hole 2F of the one disc substrate 2A can be maintained to be greater than or equal to the difference in the relative outer size. As a result, the center hole 2F of the optical disc 2 becomes the center hole 2D of the first disc substrate 2A.

Therefore, in the first disc substrate 2A, it is not necessary to keep the internal size and the external size of the center hole very accurately, and the difference between the internal size and the external size of the center hole is also maintained in the second disc substrate 2B. no need. As a result, in the optical disc 2, the first disc substrate 2A and the de disc substrate 2B can be manufactured relatively easily, and thus the production cost is also reduced.

In the present optical disc 2, it is possible to provide a necessary space between the outer frame of the disc and the inner wall portion of the disc housing portion of the disc cartridge, which will be described later, so that the disc cartridge can be produced at low cost.

Further, in the optical disk 2, the difference can be accurately maintained between the center hole 2D of the first disk substrate 2A having the signal recording area S and the external frame of the optical disk 2, which will be described later. The required space can be set between the inner wall portion of the disc housing of the disc cartridge to be used and the outer frame of the disc 2. Therefore, in the present optical disc 2, it is not necessary to maintain high accuracy on the recording / reproducing apparatus side in order to reduce the production cost of the recording and / or reproducing apparatus.

Next, the disc cartridge according to the present invention in which the optical disc according to the first embodiment is inserted will be described.

9 and 10, the disc cartridge 10 is composed of an upper cartridge half 12 and a lower cartridge half 13 each formed in a thin plate shape. The optical disc 1 is installed in the cartridge body 14 so as to rotate. The shutter 16 is provided in front of the apparatus main body 14 so as to be able to slide. On the rear side of the cartridge body portion 14, a disc insertion / ejection hole 17 through which the disc 1 can be inserted or taken out is formed. The optical disc 1 therein is an optical disc capable of recording information signals.

The upper cartridge half 12 or the lower cartridge half 13 is actually a thin plate, as shown in Figs. 9 and 10, respectively, and is formed of a synthetic resin material having good castability and sufficient mechanical strength, such as ABS resin. The upper and lower cartridge halves 12, 13 are formed of upstanding peripheral wall portions 21a, 21b, respectively. This wall is formed in the periphery of the cartridge halves except the rear side. When the upper and lower cartridge halves 12 and 13 are joined, the upstanding outer wall portions 21a and 21b are adjacent to each other and stabilized with a plurality of sets of screws which form wall portions around the outer side of the cartridge body 14.

Each opposite inner surface of the upper and lower cartridge halves 12 and 13 is formed with a plurality of intersecting arcuate wall portions engraved on the peripheral wall portions 21a and 21b and placed on the same circumference of the circle. These arcuate wall portions together form a disc housing wall portion 19. The disc housing wall portion 19 of the upper cartridge half is slightly larger than the outer diameter of the disc substrate 1B and slightly thicker than the thickness of the disc substrate 1B. The disc housing wall portion 19 of the lower cartridge half 13 is slightly larger than the outer diameter of the disc substrate 1A and slightly thicker than the thickness of the disc substrate 1A. When the upper and lower cartridge halves 12, 13 are joined, the disc housing wall portion 19 forms the disc housing portion 20 along the inner surface of the cartridge halves 12, 13. This disc housing portion 20 is limited to a space slightly larger than the outer shape of the optical disc 1 and is actually convex in cross section. The disc housing portion 20 restricts the movement of the optical disc 1 inserted into the cartridge body portion 14.

The cartridge halves 12, 13 are formed with holes 22, 23, respectively, so as to extend from the center portion to the side of the cartridge halves 12, 13, respectively. When the disc cartridge 10 is mounted thereon, the disc table of the recording and / or reproducing apparatus is pushed into the central portions 22a and 23a of the holes 22 and 23. The disk table is fitted in the disk housing 20 so as to rotate the optical disk 1.

The central portions 22a and 23a of the holes 22 and 23 extend to extend to the portions 22b and 23b toward one side of the cartridge halves 12 and 13. In these portions 22b and 23b, at least a portion of the recording area 14 of the optical disc 1 is exposed to the outside across the inside and outside of the disc. These portions 22b and 23b are used as the recording and / or reproducing holes 23. In other words, when the disc cartridge 1 is installed in the recording and / or reproducing apparatus, a recording / reproducing unit such as an optical head faces the optical disc 1 via these portions 22b and 23b of the holes 22 and 23. do.

A recess 26 is formed on the outer surface of the cartridge body portion 14. This recess 26 is provided between the position where the holes 22 and 23 are closed and the positions where the holes 22 and 23 are opened by the shutter opening and closing device installed in the recording and / or reproducing apparatus when the disc cartridge 10 is mounted thereon. Is formed to fit the moving range of the shutter 16 moving in.

When the disc cartridge 10 is not in use, i.e. when the disc cartridge 10 is not installed in the recording and / or reproducing apparatus, the shutter 16 is provided with a disc housing part through which the dust and contaminants enter through the holes 22 and 23. (20) to prevent accumulation on the optical disc (1) sandwiched in the disc housing portion (20). With the holes 22 and 23 closed, the shutter 16 prevents hands or fingers from touching the recording area S of the disc 1. The shutter 16 is operated by pressing a thin metal plate and a pair of main surface portions 28a and 28b which are sized to close the holes 22 and 23 of the upper and lower cartridge halves 12 and 13 and this side surface. It consists of the connection part 29 which connects the parts 28a and 28b with each other. The shutter 16 is formed to have a U-shaped cross section.

The shutter 16 is firmly attached to a shutter guide portion, not shown, by a plurality of sets of screws. On both sides of the connecting portion 29 of the shutter 16, although not shown in the recording and / or reproducing apparatus, there are formed deleting portions 31a and 31b into which the shutter opening pins of the shutter opening and closing apparatus are inserted.

The shutter 16 is installed in the recess 26 of the cartridge body 14 for camping the device body. The far end of the main surface portion 28 is pressed by the shutter support portion 34, while the shutter guide portion (not shown) is fitted into the guide grooves mated to the cartridge body portion 4. As shown in FIG. The disc cartridge 10 is supported by the end of the spring (not shown), that is, the other end supported by the cartridge body portion 4. Shutter 16 is permanently biased by this spring in the direction indicated by arrow A in FIG. When the shutter 16 is installed in the recording and / or reproducing apparatus, the shutter opening pin of the shutter opening apparatus is combined with one of the deleting sections 31a or 31b. This causes the shutter to slide in the direction indicated by the arrow B in FIG. 9 from the position of closing the holes 22 and 23 to the position of opening the holes 22 and 23.

Although only the case where the shutter unit 16 moves in one direction has been described above, the shutter unit 16 may of course be configured to move in the left and right directions. In this case, the recess 16 of the cartridge body portion 14 needs to be formed as a whole area in front of each of the upper cartridge half 12 and the lower cartridge half 13.

Insertion control recesses 36a and 36b are formed at both side edges of the cartridge body portion 14 toward the front. These insertion control recesses 36a and 36b are coupled to the automounting device by the insertion control pin when the disc cartridge 10 is automatically installed by the automounting device in the recording and / or reproducing device. The insertion control recesses 36a and 36b are coupled to the automatic installation apparatus by the insertion control pins when the disc cartridge 10 is moved by the automatic installation apparatus by a predetermined position in the recording and / or reproducing apparatus.

The insertion control recesses 36a and 36b are formed to extend from the upper cartridge side 12 to the lower cartridge side 13. The insertion control recesses 36a and 36b are formed over the entire thickness of the disc cartridge, so that when the disc cartridge 10 is inserted into the disc cartridge insertion apparatus in a state where the disc cartridges 10 are overlapped, the disc cartridge 10 is in the correct direction. It is possible to determine whether it is inserted. If the disc cartridge 10 is not inserted in the correct direction, the insertion control recesses 36a and 36b are not aligned with each other and thus it is determined which of the disc cartridges is inserted in the wrong direction.

Ejection control erasing portions 37a and 37b are formed toward the rear of both side edges of the cartridge body portion 14. When the disc cartridge 10 is automatically ejected from the recording and / or reproducing apparatus, these ejection control erasing portions 37a and 37b are engaged by ejecting pins (not shown) provided in the automatic installation apparatus. When the disc cartridge 10 is moved from a preset position in the recording and / or reproducing apparatus by the automatic installation apparatus, the release control deleting portions 37a and 37b are engaged by the release pins provided in the automatic installation apparatus.

The discharge control erasing portions 37a, 37b are not in the middle of the upright peripheral wall portion 21 of the upper cartridge side 12 from the lower cartridge side 13 but rather from the upper cartridge side 12 to the lower cartridge side 13. The height is formed. Therefore, when the disc cartridge 10 is ejected from the disc recording and / or reproducing apparatus manually, i.e. without using the automatic installation apparatus, the ejection control erasing portions 37a and 37b are used to control the disc recording and / or reproducing apparatus. Since it is not held by the peripheral wall of the disc cartridge insertion opening, the disc cartridge can be inserted or ejected smoothly.

In the apparatus main body 14, disc insertion / ejection holes 17 are formed on the opposite side to the shutter 16, as shown in FIG. When the disc cartridge is not in use, that is, when the disc cartridge is not installed in the disc recording and / or reproducing apparatus, the disc insertion / ejection hole 17 is used to open and close the cartridge body 14 for opening and closing the device body 14. It is closed by the lid 40 installed in the hinge at the back of the).

Ribs are formed on both side surfaces of the disc insertion / ejection holes 17 of the upper cartridge half 12. By this support 41, the disk insertion / emission hole 17 is formed larger than the cross-sectional area of the optical disk 1 as a whole, and is opened in a stepped form at right angles to each upper edge. The disc insertion / ejection hole 17 is limited by the support 41 fitted to the end 1C of the optical disc 1, and the longer side is slightly larger than the diameter of the disc substrate 1B having a smaller diameter. The first and second holes 17a having a larger and shorter side of the disc substrate 1B are slightly larger than the thickness of the disk substrate 1B, and the ones of the larger and shorter side are slightly larger than the diameter of the disk substrate 1A having a larger diameter. The second hole 17b is slightly larger than the thickness of the substrate 1A.

The disc insertion / ejection hole 17 communicates with the inside and the outside of the cartridge body portion 14 as described above, and also communicates with the disc housing portion 20 of the cartridge body portion 14. This prevents the optical disc 1 from being erroneously inserted into the disc housing 20 through the disc insertion / ejection hole 17. When the optical disc 1 is inserted into the disc housing portion 20, the above insertion of the optical disc 1 is performed by the substrate 1B of the optical disc 1 in which the optical disc 1 is parallel to the first hole 17a. Only when it is inserted through the disc insertion / ejection hole 17 together with the substrate 1A of the optical disc 1 parallel to the two holes 17b. On the contrary, the disc insertion / ejection hole of the optical disc 1 together with the substrate 1A of the optical disc 1 parallel to the first hole 17a and the substrate 1B of the optical disc 1 parallel to the second hole 17b. If inserted into (17), the end 1C of the optical disc 1 is leaned on the support 41 which prevents the insertion of the optical disc 1 into the inside of the disc housing 20 as described above.

A lid 40 used to close the disc insertion / ejection hole 17 includes a main part 45 for closing the disc insertion / ejection hole 17 and a hinge part 46 formed in the main part 45. And a support piece 47 formed at the opposite end of the main portion 45.

The main part 45 has a closing surface 48 facing the disc insertion / release hole 17. The closing surface 48 is actually the same thickness as the disc insertion / ejection hole 17 of the cartridge body portion 14 and at least substantially the same length as the length of the disc insertion / ejection hole 17 and the disc insertion / ejection hole 17 ) Is sized to have a size enough to seal. Therefore, when the disc insertion / ejection hole 17 is in the closed state, the main part 45 forms the same plane as the main surface and side surface of the cartridge body part 14.

The hinge portion 46 has a cartridge body with an unshown joint in the main portion 45 that fits into an unshown support pin formed at one end of the disc insertion / ejection hole 17 of the cartridge body portion 14. The main part 45 which opens / closes the part 14 is supported. The support piece 47 is formed integrally with the main part 45 on the opposite side to the main part 45. The far end of the support piece 47 is formed as a support 49.

When the disc insertion / ejection hole 17 is in a closed state, the lid 40 is engaged with an unshown protrusion formed at the opposite end of the disc insertion / ejection hole 17 of the cartridge body portion 14, whereby the disc cartridge ( 10) It does not open even if it is vibrated while moving. When opening the disc insertion / ejection hole 17, the lid 40 is released from an unillustrated projection of the support piece 47 to open in the direction indicated by the arrow C in FIG.

The cartridge body portion 14 is provided with a recording mistake prevention device 50 which prevents inadvertently erasing the information signal recorded on the optical disc 1. This recording mistake prevention device 50 is a cartridge body part which exposes the prevention member 51 and the recording mistake prevention device 50 installed in the empty space at the corner of the device body part toward the disc insertion / ejection hole 17. It consists of a control hole 52 formed in 14.

The recording mistake prevention member 51 is composed of an operation part 53 exposed to the outside of the control hole 52 and a support part 54 for supporting the optical disc 1, and is formed of a synthetic resin material having a U-shaped cross section in its entirety. . The control hole 52 is formed as a vacant space at the corner of the upper and lower cartridge halves 12 and 13 toward the disc insertion / ejection hole 17.

The support portion 54 of the recording mistake prevention member 51 supports the side edge of the disk 1 when the recording mistake leaving device 50 is in the first position, that is, at the position indicated by X in FIG. Then, the detection unit of the recording error detection means in the recording and / or reproducing apparatus is pushed in to prevent the writing of a new information signal. When in the first position, that is, at the position X shown in Fig. 13, the recording error preventing member 51 prevents ejection of the disc from the disc insertion / ejection hole 17 and at the same time a new information signal to the disc 1; Prevents the entry.

When the recording mistake prevention member 51 is pushed to the second position, i.e., the position indicated by Y in FIG. 13, the recording mistake prevention apparatus 50 is provided with the support portion 54 supporting the side edges of the disc 1; It is released from the state. This allows the optical disc 1 to be ejected from the disc insertion / ejection hole 17 and not to push the recording mistake detection means provided in the recording and / or reproducing apparatus so that a new information signal is recorded. When in the second position, i.e., in the position indicated by Y in FIG. 13, the recording mistake prevention member 51 allows the optical disc 1 to be ejected out of the disc insertion / ejection hole 17, while new information Causes the signal to be recorded.

If the disc cartridge 10 in which the optical disc 1 is inserted is installed in the recording and / or reproducing apparatus, the disc cartridge 10 is positioned by a positioning apparatus (not shown) while the shutter ( 16 slides in the direction indicated by arrow B in FIG. 9 to expose the holes 22, 23 to the outside. The optical disc 1 inserted in the disc cartridge 10 is fixed and rotatable by the disc table and the chuck member in the recording and / or reproducing apparatus.

In the disc cartridge 10 described above, when the disc 1 is ejected from the disc cartridge, the recording mistake prevention member 51 of the recording mistake prevention device 50 simultaneously moves to the second position, that is, the Y position shown in FIG. do. Thus, the user finds out that recording is possible on the exposed optical disc 1. If the optical disc 1 is installed in the recording and / or reproducing apparatus without being installed inside the disc cartridge 10, a new information signal can be written to the optical disc 1.

Further, in the disc cartridge 10, if the optical disc 1 is provided in the disc cartridge 10, and the recording mistake prevention member 51 of the recording mistake prevention apparatus 50 is in the first position, that is, FIG. At the X position shown in 13, the user finds out that he cannot write to the optical disc 1.

If the disc cartridge 10 is installed in the recording and / or reproducing apparatus with the optical disc 1 installed therein, the disc cartridge 10 is positioned and at the same time the shutter 16 has an arrow B in FIG. The hole (22, 23) is exposed outward as it is moved in the direction indicated by.

The disc table in the recording and / or reproducing apparatus is pushed into the recording and / or reproducing apparatus through one of the central portions 22a and 23a of the holes 22 and 23. The optical disc 1 provided in the disc cartridge 10 is fixed and rotated by a chuck member and a disc table provided in the recording and / or reproducing apparatus.

The optical disc 1 inserted in the cartridge 10 can be replaced with a new one if it is not in a useful state. In this case, with the disc cartridge 10 open and the disc insertion / ejection hole 17 facing the outside, the disc cartridge is inclined with the hole 17 facing downward. The optical disc 1 is pushed out. In order to mount the optical disc 1 to the apparatus body portion 14, the side of the optical disc 1 facing the disc substrate 1B in the state where the lid 40 is closed is determined in the direction of the first hole 17a, The side of the optical disk 1 that faces the substrate 1A is determined in the direction of the second hole 17b. The optical disc 1 is inserted through the disc insertion / ejection hole 17 in this state. Since the disc insertion / ejection hole 17 is formed to be larger than the cross-sectional area of the optical disc 1 as a whole, and is open in a stepped form at right angles to each upper edge in accordance with the end 1C of the optical disc 1, the optical disc 1 ) There is no risk of being inserted backwards.

Therefore, in this disc cartridge 10, there is no risk of a user incorrectly inserting the optical disc 1 into the cartridge body portion 14, and both the recording and / or reproducing side is set to record or reproduce at the recording and / or reproducing position. When desired, there is no risk that the desired information signal recorded on the optical disc 1 is inadvertently erased.

In the disc cartridge 10, it is assumed that the disc housing portion 20 formed in the cartridge body portion 14 is in the form of a stepped bin at a right angle to each upper edge similar to the shape of the disc insertion / release hole 17. By the way, it should be noted that the disk housing wall portions of the upper and lower cartridge halves 12 and 13 are slightly larger than the outer diameter of the disk substrate 1A so as to restrict the disk insertion portion at right angles.

The optical disc and the disc cartridge according to the third embodiment will be described. Disc cartridge 60 will first be described with reference to FIGS. 14 and 15. The disc cartridge 60 has a toroidal rib 61a in the inner periphery of the optical disc 61 in which no information signal is recorded. The cartridge body portion 63 actually has a disc insertion / ejection hole 83 that is shaped like a cross section of the optical disc 61. Parts similar to those used in common with the parts of the disc cartridge 10 shown in FIGS. 9 to 11 are denoted by the same reference numerals and description thereof will be omitted.

Similar to the disc cartridge 10 shown in Figs. 9 to 11, the disc cartridge 60 has a cartridge body portion 64 formed by combining the upper cartridge half 62 and the lower cartridge half 63, which are actually thin plates. Have An optical disc 61, such as a recordable optical disc or a magneto-optical disc, is rotatably provided in the cartridge body portion 64. As shown in FIG. The shutter 16 is provided to slide on the front surface of the cartridge body 64. The rear surface of the cartridge body portion 64 is formed with a disc insertion / ejection hole 83 into which an optical disc 61 is inserted or discharged. The upper and lower cartridge halves 62, 63 are constructed similarly to the cartridge halves 12, 13 of the disc cartridge 10 shown in Figs.

Installed in the disc cartridge 60, the optical disc 61 is constituted by a single disc substrate 61b on one main surface on which an information signal region is formed. The disk substrate 61b has an inner edge portion 61c formed at the center where no information signal is recorded, a recording region 61d on which an information signal having an outer radius of the inner edge portion 61c is recorded, and this recording region ( An outer frame side non-recording area 61e in which an information signal having an outer radius of 61d) is not recorded. The optical disc 61 is formed with an upright toroidal rib 61a extending along the outer edge of the inner edge portion 61c on the signal recording main surface, that is, the recording and / or reproducing surface. Thus, the disk has a cross section at right angles to the center portion of the square.

The inner surface of the cartridge body 64 is formed of an outer rim side disk housing wall portion 78 and an inner rim side disk housing wall portion 79. The outer rim side disk housing wall portion 78 is composed of a plurality of arcuate wall portions placed on the same circumference of a circle. On the other hand, the inner rim side disk housing wall portion 79 is the upper cartridge half 62 coincides with the outer rim of the toroidal rib 61a, which is erected when the optical disc 61 is installed in the cartridge body portion 64. It is formed on the inner surface of the. The outer rim side disk housing wall portion 78 is slightly larger than the outer diameter of the optical disk 61 and slightly thicker than the thickness of the optical disk 61. The inner rim side disk housing wall 79 is slightly higher than the height of the rib 61a. When the upper and lower cartridge halves 62 and 63 are joined together, the disc housing wall portions 78 and 79 are adjacent to each other so as to limit the disc housing wall portion 80 having a right angled cross section to a center portion that is erected. The disk housing 80 limits the amount of movement of the cartridge body 64 of the optical disk 61 inserted therein.

The surface of the cartridge body portion 64 on the opposite side of the front face with the shutter 16 is formed by the disc insertion / ejection holes 83. When the disc cartridge is not in use, i.e. when the disc cartridge 60 is not installed in the recording and / or reproducing apparatus, the disc insertion / ejection holes 83 are opened / closed to the rear surface of the cartridge body 64. It is closed by the attached lead 40.

A support portion 41 is formed in the disc insertion / ejection hole 83 that faces the inner cartridge support portion 61c and the upper cartridge half 62 that coincides with the recording area 61d. By providing the support portion 41, the disc insertion / ejection hole 83 is formed to be larger than the cross-sectional area of the optical disc 1 as a whole and has a rectangular shape standing in the center portion. The disc insertion / ejection hole 83 is constrained by the support portion 41 in accord with the internal edge support portion 61C of the optical disc 1, and the size of the longer side is slightly larger than the diameter of the internal edge support portion 61C. The size of the first hole 83a slightly larger than the height of the rib 61a and the size of the long side are slightly larger than the diameter of the disk substrate 61b and the size of the short side is slightly larger than the thickness of the disk substrate 61b. It consists of a hole 83b.

The disc insertion / ejection hole 83 configured as described above passes through the inside of the disc housing 80 of the cartridge body 64. This prevents the optical disc 61 from being erroneously inserted into the disc insertion portion 80 through the disc insertion / ejection hole 83. When the optical disc 61 is inserted into the disc housing 80 of the disc cartridge 60, the insertion of the optical disc 61 as described above causes the internal disc portion of the optical disc 61 in which the optical disc is parallel with the first hole 83a. Only when inserted through the disc insertion / ejection hole 83 together with the substrate 61b parallel to the 61C and the second hole 83b. On the contrary, at the position where the optical disk 61 is reversed from the normal insertion position, that is, in the rearward position, that is, the inner substrate supporting portion 61c parallel to the disk substrate 61b and the second hole 83b parallel to the first hole 83a. ) And the disc insertion / ejection hole, the optical disc 61 is not inserted.

The optical disc inserted in the disc cartridge 60 can be exchanged for a new one if the disc cartridge is not in use as in the case of the disc cartridge 60 shown in Figs. In this case, the disc cartridge 61 is inclined with the hole 83 facing downward into the disc insertion / release hole 83 facing the lid 40 of the opened disc cartridge 60 and the outside. Then, the optical disc 61 may slide and be released to the outside. In order to install the optical disk 61 in the cartridge body 64, the inner frame 61C of the optical disk 61 is placed to face the first hole 83a, while the disk substrate is closed with the lid 40 closed. 61b is placed to face the second hole 83b. The optical disc 1 is inserted into the cartridge body 64 through the disc insertion / ejection holes 83 in this state. Since the disc insertion / ejection hole 83 is formed to be larger than the cross-sectional area of the optical disc 1 as a whole, and is open in a stepped form at right angles to each upper edge so as to engage with the inner edge portion 61C of the optical disc 1, the optical disc There is no danger of (1) being inserted backwards.

Thus, in the disc cartridge 60, the user inadvertently moves the optical disc 61 to the cartridge body 64 in a state where the recording and / or reproducing side is not desired to be recorded or reproduced in the recording and / or reproducing apparatus. There is no risk of inserting a symbol, but there is also no risk of inadvertently erasing a desired information signal recorded on the optical disc 1.

In the disc cartridge 60, it is assumed that the disc housing portion 80 formed in the cartridge body portion 64 has a stepped shape at right angles to each upper edge, similar to the shape of the disc insertion / ejection hole 83. However, the disk housing wall portions 78, 79 of the upper and lower cartridge halves 62, 63 are also slightly larger than the outer diameter of the disk substrate 61b, and the height of the disk housing wall portions 78, 79 is equal to the thickness of the disk substrate 61b. It is the sum of the ribs 61b, and the disc housing portion is composed of a rectangular cross section.

An optical disc and a disc cartridge according to a fourth embodiment of the present invention will be described. First, the disc cartridge 90 according to the fourth embodiment will be described with reference to FIGS. 16 and 17. In order to insert or eject an optical disk 91 having an inclined outer frame, the disk cartridge 90 has a cartridge body portion 94 having a disk insertion / ejection hole 93 having the same shape as a cross section of the optical disk 91. Has Parts and components commonly used with the disc cartridge 10 shown in FIGS. 9 and 10 are denoted by the same reference numerals, and corresponding descriptions are omitted for simplicity.

The disc cartridge 90 is composed of an upper cartridge half 92 and a lower cartridge half 93 which are actually thin plates similar to the upper and lower cartridge halves 12 and 13 of the disc cartridge 10 shown in FIGS. 9 to 11. It has a cartridge body portion (94). An optical disc 91, such as a recordable optical disc or a magneto-optical disc, is rotatably provided in the cartridge body portion 94. As shown in FIG. The shutter 16 is provided to slide in the cartridge body portion 94. The rear surface of the cartridge body portion 94 is formed by a disc insertion / ejection hole 95 through which the optical disc 91 is inserted or discharged.

The optical disc 91 provided in the disc cartridge 90 is composed of one disc substrate 101 on one main surface on which an information recording area is formed. The disc substrate 101 includes an inner frame portion 102 to be arranged at the center where no information signal is recorded, a recording area 103 in which an information signal having an outer radius of the inner frame portion 102 is recorded, and recording. It has an external frame side non-recording area 104 in which an information signal of an outer radius of the area 103 is not recorded. The optical disc 103 configured as described above has a recording and / or reproducing surface on the information signal recording main surface, i.e., the outer diameter on which the information signal is not recorded, is smaller than the opposite main surface, and the optical disk 91 is actually a conical section and at the same time an optical disk. The outer frame of 91 is an inclined surface.

The upper cartridge half side 92 or the lower cartridge half side 93 is formed of a disc housing wall portion 110 composed of a plurality of arcuate wall portions lying on the same circumference of a circle. The disk housing wall portion 11 is formed as an inclined wall portion which meshes with the outer shape of the optical disk 91 and is slightly larger than the outer diameter of the optical disk 91. When the upper and lower cartridge halves 92 and 93 are joined, the disc housing wall portion 110 restricts the disc housing portion 111 therein. Thus, the disc housing portion 111 limits the amount of movement of the optical disc 91 inserted into the cartridge body portion 94.

The surface of the cartridge body portion 94 on the opposite side to the front face with the shutter 16 is formed by the disc insertion / ejection hole 95. When the disc cartridge 90 is not in use, i.e. when the disc cartridge 90 is not installed in the disc recording and / or reproducing apparatus, the disc insertion / ejection hole 95 is formed on the rear surface of the cartridge body portion 94. It is closed by a lid 40 installed for opening / closing.

The disc insertion / ejection hole 95 has support portions 113 at both side ends of the upper cartridge half 92 so as to actually have a conical shape corresponding to the cross section of the optical disc 91. The support portion 113 is formed with ribs at both end portions of the upper cartridge half 92. The disc insertion / ejection hole 95 is slightly larger than the diameter of the main surface of the disc 91 corresponding to the recording and / or reproducing surface of the long side on the upper half cartridge 92 side, and the lower half cartridge 93 The long side on the) side is slightly larger than the size of the opposite main surface of the optical disk 91 and at the same time the height of the hole is slightly larger than the thickness of the optical disk 91.

The disc insertion / ejection hole 95 configured as described above passes through the inside of the disc housing 80 of the cartridge body 111. This prevents the optical disc 91 from being incorrectly inserted into the disc insertion section 111 via the disc insertion / ejection hole 95. When the optical disc 91 is inserted into the disc housing 111, the insertion of the optical disc 91 is performed by the optical disc in which the recording and / or reproducing main surface side of the optical disc 91 has an upper cartridge ( 92, and only when it is inserted through the disc insertion / ejection hole 95 with the opposite peripheral surface side of the optical disc 91 facing the lower cartridge side 93. As shown in FIG. On the contrary, the optical disc 91 is reversed from the normal state, and the front side is turned to the rear side, that is, the recording and / or reproducing main surface side of the optical disc 91 faces the lower cartridge 92 of the disc insertion / ejection hole 95. The optical disc 91 cannot be inserted into the disc insertion portion 111 if the opposite main surface side of the optical disc 91 is inserted into the disc insertion / ejection hole in a state of being placed facing the upper cartridge side 93.

The optical disc inserted in the disc cartridge 90 can be exchanged for a new one when the disc is not in use, that is, when the disc cartridge is not installed in the recording and / or reproducing apparatus. In this case, the disc cartridge is inclined with the hole 95 downward while the lid 40 is open and the disc insertion / release hole 95 faces outward. The optical disc 61 can then slide out and be ejected out. When the optical disc 91 is mounted in the cartridge body portion 94, the recording and / or reproducing main surface of the optical disc 61 is directed toward the upper cartridge half side of the disc insertion / ejection hole 95 with the lid 40 closed. The opposite circumferential surface of the disk is directed toward the lower cartridge half side of the second hole 83b. The optical disc 1 is inserted into the cartridge body 94 via the disc insertion / ejection hole 95 in this state. Since the disc insertion / ejection hole 95 is formed so that the overall cross section of the optical disc 91 is too high, there is no danger of the optical disc 10 being inserted upside down. Thus, in the present disc cartridge 90, the user can record and / or While there is no danger of inadvertently inserting the optical disc 91 into the cartridge body portion 94 while the reproduction side is set to a recording and / or reproducing position where it is not desired to be recorded or reproduced, the desired disc recorded on the optical disc 10 There is no risk of inadvertently erasing the information signal.

In the above disc cartridge 90, it is assumed that the disc insertion portion 111 formed in the cartridge body portion 94 has a conical shape similar to the shape of the disc insertion / ejection hole 83. By the way, the disk housing 111 is also the size of the disk housing wall portion 110 of the upper cartridge side 92 and the lower cartridge side 93 is slightly larger than the external size of the optical disk 91 and the height of the insertion wall 110 is an optical disk. Note that it is slightly larger than the thickness of 91 and is a rectangular cross section.

An optical disc and a disc cartridge according to a fifth embodiment of the present invention will be described. First, the disc cartridge 120 according to the fifth embodiment will be described with reference to FIGS. 18 to 20. In the following description, it is assumed that the optical disc 2 of the second embodiment is installed in the disc cartridge 120.

The disc cartridge 120 has a box shape having a thin thickness as a whole, and is composed of a cartridge body 121 in which one of the main surfaces is opened, and a lid 122 for closing the opened main surface of the cartridge body 121. . The optical disc 2 can be inserted into and ejected from the disc cartridge 120 by opening / closing the lid 122. In this case, the optical disc 2 is a recordable optical disc capable of recording an information signal.

The cartridge body 121 is actually formed in a thin box shape, as shown in Figure 18, is formed of a synthetic resin material having a high castability and sufficient mechanical strength, such as ABS resin. At the center of the main surface 140 of the cartridge body 121, a circular recess acting as the disk housing 141 for installing the optical disk 2 is formed.

The disc housing 141 is formed to be slightly larger than the external size of the optical disc 2. The frame of the disk housing 141 is formed of a support 142 in the form of a toroidal rib. The support portion 142 is in the form of a stage so that the first upstanding wall portion 144 from the bottom surface 143 of the disk housing portion 141 is slightly larger than the thickness of the disk substrate 24. A fixing surface 145 extending from the first upstanding wall portion 144 and parallel to the bottom surface 143 is formed. The second upstanding wall portion 146 extends from the fixed surface 145. The support portion 142 is formed to fit the end 2C of the optical disk 2. The disc housing portion 141 limits the amount of movement of the optical disc 2 inserted into the cartridge body 121.

The bottom surface 143 of the disc housing portion 141 has a window 148 extending from the center toward the outside of the cartridge body portion 121 to be fitted with the lid 122. This window 148 shows a disc table insertion hole 148a and a disc table insertion hole corresponding to the shape of the disc table installed in the recording and / or reproducing apparatus when the disc cartridge 120 is installed in the recording and / or reproducing apparatus. Recording of a rectangular cross section which exposes at least the recording surface S portion of the optical disc 2 across its inner and outer frames toward the outside of the cartridge body 121 fitted to the lid 122 from 148a; And / or the regeneration hole 148b.

When the disc cartridge 120 is not in use, ribs are formed that act as fixed surfaces 151 to which the optical disc 2 is fixed. In other words, when the disc cartridge 120 is not in use, the inner edge portion of the disc substrate 2A is leaned against the fixed surface 151.

Consistent with this window 148, the disc cartridge 120 is opened when the disc cartridge 120 is mounted in the recording and / or reproducing apparatus, and when the disc cartridge 120 is not in use, dirt and contaminants enter the disc housing 141. A shutter is provided, which is configured to close the stack and prevent the hand or finger from touching the recording area S of the optical disc 2.

The lid 122 is pivotally installed to open / close the rear wall portion 154 constituting the outer peripheral wall portion of the cartridge body 121. For example, the lid 122 is made of a transparent synthetic resin material and fitted into a recess 155 formed on the main surface of the cartridge body 121. The inner surface of the lid 122 facing the recess 155 is provided with a disk fixing body 156 facing the disk table insertion hole 148a.

The disc fixing body 156 includes an outer peripheral rib 157 for supporting the inner frame of the optical disc 2, an inner peripheral rib 158 fitted into the center hole 2F of the optical disc 2, and an outer peripheral rib ( 157 and chuck plate 159 loosely fitted to inner circumferential rib 158. The chuck plate 159 fixes the inner edge portion of the optical disc 2 along the disc table pushed in via the disc table insertion hole 148a. The chuck plate 159 is formed of a disk of synthetic resin material sealed with a magnetic metal plate therein so as to be magnetically fixed by a magnet installed in the disk table.

On the inner surface of the lid 122, ribs 160, which coincide with the non-recording area around the outer side of the optical disc 2, are formed to protrude. The rib 160 limits the vertical vibration of the optical disc 2 in the state in which the lid 122 is closed.

When the disc cartridge 120 having the optical disc sealed therein is installed in the recording and / or reproducing apparatus, the disc table on the recording and / or reproducing apparatus side has a disc in the lid 122 so that the optical disc 2 is rotatable. It is pushed along the fixing body 156 into the disk table insertion hole 148a which fixes the optical disk 2.

The optical disc inserted in the disc cartridge 120 can be exchanged for a new one when the disc cartridge is not in use, that is, when the disc cartridge is not installed in the recording and / or reproducing apparatus. In this case, the optical disc 2 can be exchanged with the lid 122 open.

In mounting the optical disc 2 to the cartridge body portion 121, the optical disc has the lid 122 closed, as shown in Fig. 19, with the disc substrate 2A of the optical disc 2 facing downward, i.e., the cartridge. The disk housing 141 is installed in a state of facing the bottom surface 143 of the disk housing 141 of the main body 121. At this time, the disk housing portion 141 is coupled to the support portion 142 in accordance with the end of the optical disk (2). In this case, the lid 122 is closed by reliably engaging the recess 155.

Conversely, with the optical disc 2 shown in FIG. 20, the disc substrate 2B of the optical disc 2 faces downward, i.e., the disc with the bottom face of the disc housing 141 of the cartridge body 121. When inserted into the housing portion 141, the disc substrate 2B is fixed to the fixing surface 145 without engaging the end 2C of the optical disc 2 with the support portion 142. Therefore, the disc substrate 2A is pushed out through the recess 155 of the cartridge body 121 without closing the lid 122. As shown in FIG.

In the disc cartridge 120 described above, there is no danger of the optical disc 2 being incorrectly inserted in an inverted state. Therefore, in the disc cartridge 120, the user inadvertently moves the optical disc 120 to the apparatus main body 121 while the recording and / or reproducing side is set to be recorded or reproduced at an undesired recording and / or reproducing position. While there is no risk of insertion, there is also no risk of inadvertently erasing the desired information signal recorded on the optical disc 2.

A sixth embodiment of the disc cartridge will now be described. The disc cartridge 260 of the sixth embodiment includes a recording mistake prevention device 263 provided in the lid 262 that closes the disc insertion / ejection hole 261. Parts and components commonly used with the disc cartridge 10 are denoted by the same reference numerals and corresponding descriptions are omitted for simplicity.

Referring to FIG. 21, the rear side of the apparatus main body 14 has a disc insertion / ejection hole 261 into which the optical disc 1 described with reference to FIGS. 4 and 5 is inserted. The disc insertion / ejection hole 261 has a first hole portion whose length is slightly larger than the diameter of the smaller diameter disc substrate 1B and the size of the short side is slightly larger than the thickness of the disc substrate 1B. 261a), the length of the long side is slightly larger than the diameter of the larger diameter disc substrate 1A, and the size of the short side is slightly larger than the thickness of the disc substrate 1A. The third hole portion 261c has a configuration similar to that of the portion 261a. The optical disc 1 having a rectangular cross section having a standing rectangular center portion can be installed through the disc insertion / ejection hole 261 with the disc substrate 1B facing upward or the disc substrate 1A facing upward. Can be.

The lid 262 which closes the disc insertion / ejection hole 261 is the main part 275 which closes the disc insertion / ejection hole 261, the hinge formed at the end of the main part 275, and the opposite side of the main part 275. It has a support 276 formed at the end.

The main portion 275 has a sealing surface 277 on the side facing the disc insertion / release hole 261. The sealing surface 277 is formed on an arcuate surface such as a side edge of the optical disc 1. When the lid 262 closes the disc insertion / release hole 261, the lid restricts the disc housing portion 20 along the inner surface of the cartridge halves 12, 13. On the main surface 278 of the main portion 275, a recording mistake prevention device 263 is provided. When the lid 262 closes the disc insertion / ejection hole 261, the main portion 275 becomes flush with the main surface and side surfaces of the cartridge body portion 14. At the opposite end of the main portion 275, the support 276 is integrally formed with the main portion 275. The support 279 is formed at the far end of the support 276.

The lid 262 is engaged with an unshown protrusion formed at the opposite end of the disc insertion / ejection hole 261 of the cartridge body portion 14 when the disc insertion / ejection hole 261 is closed. Vibration that occurs while transporting the disc cartridge 260 does not inadvertently open. When the lid 262 opens the disc insertion / ejection hole 261, the support 276 is released from the protrusion of the cartridge body portion as a result of the opening operation.

The recording mistake prevention device 263 has a hole 282 formed in the main surface 278 of the lead 262 for exposing the recording mistake prevention device member 281 and the recording mistake prevention device 281 provided to the lead 262 to the outside. And a control hole 283 formed in the upper cartridge half 12.

The recording mistake prevention device member 281 has the actuating portion 284 and the supporting portion 285 formed on both sides of the actuating portion 284. The support portion 285 has a cut-out 286 extending from the actuating portion 284 in the thickness direction of the engaging region.

The hole 282 and the control hole 283 are formed as extending holes extending along the side of the cartridge body portion 14 formed in the disc insertion / ejection hole 261. These holes 282 and 283 allow the actuating portion 284 of the recording mistake prevention member 281 to be exposed to the outside while the recording mistake prevention member 281 slides therein.

In the above recording mistake prevention device 263, if the lid 262 closes the disc insertion / ejection hole 261, the actuation portion 284 is exposed to the outside through the control hole 283. Thus, the lid 262 is locked by the recording mistake prevention member 281 against the operation in the opening direction. When the disc cartridge is installed in the recording and / or reproducing apparatus, the recording mistake prevention member 281 prevents the detection portion of the recording error detecting means provided in the recording and / or reproducing apparatus from being pushed in, and thus, the optical disc 1 is replaced with a new one. Writing of the information signal is prevented.

If the lid 262 is operated in the opening direction, the support portion 285 of the recording mistake prevention member 281 is first removed. Since the support portion 285 is formed with the actuation portion 284 via the cutout 286, the support portion can be easily removed by pushing the actuation portion 284 from the above. Since the support portion 285 is removed from the holes 282 and 283, the recording mistake prevention member 281 can unlock the lid 262 so that the lid 262 can be opened.

If the disc cartridge 260 is installed in the recording and / or reproducing apparatus with the recording mistake preventing member 281 destroyed in the above manner, the detection unit of the recording mistake detecting means installed in the apparatus is replaced with the optical disc 1. It is pushed into the holes 282 and 283 for writing the information.

Thus, even if the optical disc 1 is never ejected from the disc cartridge 260, the user can know that writing of a new information signal is prevented. If the user once takes the optical disc 1 out of the disc cartridge 260, the user can know that writing of the new information signal has become useless.

A seventh embodiment of a disc cartridge will now be described. In the disc cartridge 290 of the seventh embodiment, an auxiliary member of the recording mistake prevention device 291 is provided in the lid 292 used to close the disc insertion / release hole 17, as shown in FIG. Otherwise, this embodiment is the same as the disc cartridge 10 shown in Figs.

The lid 292 closing the disc insertion / ejection hole 17 includes a disc insertion / ejection hole 17, a hinge (not shown) formed at the end of the main portion 293, and a support 294 formed at the opposite end of the main portion 293. Has

The main portion 293 side facing the disc insertion / ejection hole 17 is formed as a sealing surface 295. The sealing surface 295 is formed to have an arch surface like the side edge of the optical disk 1. When the lid 292 closes the disc insertion / ejection hole 17, the lid forms the disc insertion portion 20. On the main surface 296 of the main portion 293, a write preventing device 291 is formed. When the lid 292 closes the disc insertion / ejection hole 17, the main portion 293 forms one plane with the main surface and side surfaces of the cartridge body portion 14. The support 294 formed at the opposite end of the main portion 293 is formed integrally with the main portion 293, and at its far end there is a support 297.

When the lid 292 closes the disc insertion / ejection hole 17, the support portion 297 is engaged with an unshown protrusion formed on the opposite side of the disc insertion / ejection yoke 17 of the cartridge body portion 14, It also does not open to vibrations that occur while carrying the disc cartridge 290. When opening the disc insertion / ejection hole 17, the support 294 is unlocked to open the lid 292.

The recording mistake prevention device 291 includes a recording mistake prevention member 301 provided in the lead 292, a hole 302 formed in the main surface 296 of the lead 292 exposing the recording mistake prevention member 301 to the outside, A connecting body 303 connecting the recording mistake prevention member 301 to the hole 302, and a control hole (not shown) formed in the upper cartridge half 12. As shown in FIG. The connecting body 303 is formed into a thin plate so as to be broken when being pushed by the recording mistake prevention member 301.

In the above recording mistake prevention device 291, if the lid 292 closes the disc insertion / ejection hole 17, the recording mistake prevention member 301 passes through a hole not shown in the upper cartridge side 12. Is exposed to the outside. Thus, the lid 292 is locked by the recording mistake prevention member 301 against the operation in the opening direction. In the recording mistake prevention member 301, the detection unit of the recording mistake detection means of the recording and / or reproducing apparatus is not pushed in if the disc cartridge 290 is provided in the recording and / or reproducing apparatus, thereby causing a new information signal. Is not written to the optical disc 1.

When the lid 292 is operated in the opening direction, the connecting body 303 of the recording mistake prevention member 301 is first broken. The connecting body 303 is broken by the preventing member 301 to be pushed in from above. Since the connecting body 303 is broken, the recording mistake prevention member 301 is removed from the hole 302. As a result, the lid 292 is unlocked so that the lid 292 can be opened.

If the disc cartridge 290 from which the recording mistake prevention member 301 has been cut is installed in the recording and / or reproducing apparatus, the detection unit of the recording mistake detecting means of the recording and / or reproducing apparatus has a hole 302 and an upper cartridge half ( The new information signal can be written to the optical disc 1 by being pushed into the control hole (not shown) of 12). Thus, if the optical disc 1 is not ejected from the disc cartridge 290, the user can know that writing of a new information signal is prevented. Once the user removes the optical disc 1 from the disc cartridge 290, the user can know that writing of the new information signal has become useless.

In the lid 292, the auxiliary member 305 of the recording mistake prevention member 301 is integrally provided with the main surface 296 of the lid. This auxiliary member 305 is provided in the hole 302 once the recording mistake prevention member 301 is removed. The auxiliary member 305 is composed of the operating member 306 and the elastic piece 307 protruding from the side edge of the operating member and is connected to the main portion 293 by the connecting piece 308. The auxiliary member 305 is identical in appearance to the recording mistake prevention member 301. The elastic piece 307 protrudes from the frame of the recording mistake prevention member 301 so as to be slightly larger than the hole 302.

When installed in the hole 302, the auxiliary member 305 is first cut out of the connecting piece 308. At this time, the auxiliary member 305 is cut by bending up and down. The auxiliary member 305 cut as described above is installed by being pushed into the hole 302 by the flexibility of the elastic piece 307. Since the elastic piece 307 is slightly larger than the hole 302, the elastic piece 307 is elastically replaced to push the auxiliary member 305 into the hole 302. Since the elastic piece 307 is slightly larger than the hole 302 and engages with the peripheral wall of the hole 302, there is a risk that the elastic piece 307 is inadvertently removed from the hole 302 while carrying the disc cartridge 290. none. By using the auxiliary member 305 in this way, the disc cartridge 290 can be reused.

An eighth embodiment of a disc cartridge will now be described. The disc cartridge 320 of the eighth embodiment includes a recording mistake prevention device 322 in the empty space of the disc insertion / ejection hole 321 of the cartridge body 14 as shown in FIG. Parts or components commonly used in the disc cartridge 10 are denoted by the same reference numerals and corresponding descriptions are omitted for simplicity.

The optical disc 1 is inserted into the disc insertion / ejection hole 321 formed in the rear side of the cartridge body portion 14 as shown in Figs. The disc insertion / ejection holes 321 are rectangular in shape and the long side thereof is slightly larger than the diameter of the larger diameter disc substrate 1A and the shorter side thereof is slightly larger than the sum of the thicknesses of the disc substrates 1A and 1B. It is sized to be larger. The disc insertion / ejection hole 321 has a disc housing with an optical disc 1 having a rectangular cross section at both side edges regardless of whether the disc substrate 1B faces upward or the disc substrate 1A faces downward. Is inserted into the negative.

The disc insertion / ejection hole 321 is opened or closed by the lid 40 of the disc cartridge 1 shown in FIGS. 9 to 11.

The recording mistake prevention device 322 includes a support piece 325 for limiting the position of the optical disc 1, a recording mistake prevention member 326 integrally installed with the support piece 325, and upper and lower cartridge halves 12, 13; It is composed of a control hole 327 formed in the).

The support piece 325 is actually elliptical and has one end with the pivot 330 formed on the upper and lower cartridge halves 12, 13 so that the support piece is turned in the direction indicated by arrows C and D in FIG. 23. do.

The support piece 325 has a hole 328 in which the recording mistake prevention member 326 integrated with the support 325 is provided by a plurality of connecting pieces 329 at opposite ends thereof. The recessed coupling portion 331 is formed on the upper surface of the recording mistake prevention member 326. The recording mistake prevention member 326 is exposed to the outside through control holes 327 formed at edges of the upper and lower cartridge halves 12 and 13 at both ends of the disc insertion / ejection hole 321. The recording mistake prevention member 326 can be removed by rotating by inserting a flat head screwdriver into the coupling portion 331. Once the recording mistake prevention member 326 is removed, no information can be recorded on the optical disc included in the disc cartridge even if the optical disc is replaced.

The control hole 327 is formed arcuate with the long side of the arc extending in parallel with the side of the cartridge body portion 14 in which the disc insertion / ejection hole 321 is formed. The recording mistake prevention member 326 moves in a bow shape along the control hole 327 in the direction indicated by arrows C and D in FIG. 23 to rotate the support piece 325.

In the above-described recording mistake prevention device 322 in the first position indicated by V in FIG. 23, the support piece 325 locks the side edge of the disc 1, and the recording mistake prevention member 326 writes a new recording signal. To prevent. The above-described recording mistake prevention device 322 at the second position indicated by W in FIG. 23 is a result of pushing the recording mistake prevention member 326 to move, so that the side edge of the disc 1 by the support piece 325 is moved. Indicates that the disc 1 is released so that the disc 1 can be ejected from the disc insertion / ejection hole 321, and at the same time, the recording mistake prevention member 326 makes it possible to record a new information signal. If the recording mistake prevention member 326 has been removed as described above, the recording mistake detection means in the recording and / or reproducing apparatus judges that recording is not possible. Therefore, even when the disc is replaced, the information signal is not inadvertently recorded on the exchanged disc.

In the disc cartridge 320, if the disc 1 is ejected from the disc cartridge 320, the recording mistake prevention member 326 of the recording mistake prevention device 322 simultaneously moves to the second position indicated by W in FIG. And the user can recognize that writing to the disc 1 is possible.

On the other hand, if the disk 1 is inserted into the disc cartridge 320, the recording mistake prevention member 326 of the recording mistake prevention apparatus 322 is in the first position indicated by V in FIG. Thus, the user can recognize that the disc 1 cannot be written to.

The present invention can be variously modified without departing from the object of the present invention.

As described above, according to the disk-shaped optical recording medium according to the present invention, the first disc substrate and the second disc substrate are provided with a signal recording area on at least one of the disc substrates, and a center hole is provided on the other disc substrate. As it becomes larger than the center hole of the disc substrate, eccentricity occurring in the center hole of the disc substrate and the outer diameter of the disc-shaped optical recording medium, which has a signal recording area, can be prevented.

1 is a perspective view showing the structure of a bonded optical disk.

FIG. 2 is a cross-sectional view of the optical disc shown in FIG. 1.

3 is a cross-sectional view showing a state where the optical disc shown in FIG. 1 is inserted into a cartridge.

4 is a perspective view showing the structure of an optical disc according to a first embodiment of the present invention.

FIG. 5 is a cross-sectional view of the optical disc shown in FIG. 4.

6 is a perspective view showing the structure of an optical disc according to a second embodiment of the present invention.

FIG. 7 is a perspective view of the optical disc shown in FIG. 6.

8 shows a state in which two disk substrates of the optical disk of the second embodiment are bonded together.

Fig. 9 is a sectional view showing the structure of a disc cartridge in which the optical disc of the first embodiment is inserted.

FIG. 10 is a cross-sectional view showing the optical disk shown in FIG. 9 as viewed from the opposite side.

FIG. 11 is a perspective view illustrating a state where an optical disc is inserted into the disc cartridge shown in FIG. 9.

12 is a cross-sectional view showing a state where the optical disc shown in FIG. 9 is inserted into a cartridge.

FIG. 13 is a schematic perspective view showing an apparatus for preventing a mistake of recording of a disc cartridge shown in FIG.

14 is a perspective view showing an optical disc and a disc cartridge according to a third embodiment of the present invention.

Fig. 15 is a sectional view showing a state where an optical disc is inserted into a disc cartridge according to a third embodiment of the present invention.

16 is a perspective view showing an optical disc and a disc cartridge according to a fourth embodiment of the present invention.

Fig. 17 is a sectional view showing a state where the optical disc is inserted in the disc cartridge according to the fourth embodiment of the present invention.

18 is a perspective view showing a disc cartridge according to a fifth embodiment of the present invention.

Fig. 19 is a sectional view showing a state where an optical disc is inserted into a disc cartridge according to a fifth embodiment of the present invention.

20 is a cross-sectional view showing a state where an optical disc is incorrectly inserted in the disc cartridge according to the fifth embodiment of the present invention.

21 is a schematic perspective view showing an apparatus for preventing a mistake in recording of an optical disc according to a sixth embodiment of the present invention.

Fig. 22 is a schematic perspective view showing an apparatus for preventing a mistake in recording a disc cartridge according to a seventh embodiment of the present invention.

Fig. 23 is a schematic perspective view showing an apparatus for preventing a mistake of recording a disc cartridge according to an eighth embodiment of the present invention.

* Explanation of symbols on the main parts of the drawings

1,2,61,91. Optical disc

10,60,90,120,260,360. Disc cartridge

1A, 1B, 2A, 2B. Disc board 1D, 1E, 2D, 2E. Center hole

12,62,92. Upper cartridge 13,63,93. Lower cartridge

14,64,94,121. Cartridge body

17,83,93,261,321. Disc insertion / ejection hole

20,80,111,141. Disc housing 19,78,79,110. Disk housing wall part

16. Shutters 40,122,262,292. Lid

41. Support 45. Main part

46. Hinge 47. Support piece

50,263,291,322. Record mistake prevention device

51,281,301,326. Record mistake prevention member

52. Control hole 305. Auxiliary member

148. Windows

Claims (12)

A disk comprising two disk substrates bonded to each other, the disk is asymmetric in the cross-section centered on the junction center line in the disc cartridge, The hole forms a disc housing, has a hole for inserting and ejecting the disc into the disc housing, and further includes two rib-shaped retainers extending from the hole to the disc housing, so that the hole has an asymmetrical cross section of the disc. A cartridge body formed so as to have substantially the same shape, wherein the hole is configured to receive the disc only in one orientation corresponding to a state that allows recording and / or playing of the disc; A take-out prohibition mechanism for opening / closing the hole and specifying whether recording on the disc is possible, wherein the take out prohibition mechanism prohibits taking out the disc from the cartridge body. Specifying a state of prohibiting recording on the disc when moved to a first position exposed to the outside through a control hole formed in the cartridge body, and moving to a second position exposed to the outside through the control hole. An opening / closing device including a discriminating member for designating a state that recording on the disc is possible, And the prohibiting mechanism is in contact with the disk to receive the disk when moved to the first position. The method of claim 1, And the hole has a shape corresponding to the cross-sectional shape of the disk to allow insertion and ejection of the disk only in a state that permits recording and / or playback of the disk. The method of claim 1, And the aperture includes a support portion used to lock the disc when the disc is inserted without permitting recording and / or playback of the disc. The method of claim 1, And the opening is formed in the side of the cartridge body, and the opening / closing device includes an opening / closing member rotatably mounted to the cartridge body to open / close the opening. A disk comprising two disk substrates bonded to each other, the disk is asymmetric in the cross-section centered on the junction center line in the disc cartridge, A disk housing having a hole for inserting and ejecting the disk into the disk housing, and further comprising two rib-shaped retainers extending from the hole to the disk housing, the holes having an asymmetrical cross-section of the disk; Since the holes are formed to have substantially the same shape, the hole is provided with a cartridge body configured to receive the disc only at one orientation corresponding to a state that allows recording and / or playing of the disc; And a take out prohibition mechanism for opening / closing the hole and specifying whether recording is possible on the disc, wherein the take out prohibition mechanism removes the disc from the cartridge body in a state of prohibiting recording on the disc. It consists of an open / closed device that prohibits takeout, The opening / closing movement of the opening / closing device is prohibited when the prohibiting mechanism designates a state which prohibits recording on the disc,  The takeout prohibiting mechanism includes a discriminating member for designating whether recording on the disc is possible; The discriminating member is mounted for movement between a first position specifying a state that prohibits recording on the disc and a second position specifying a state that enables recording on the disc, And the cartridge body includes a discriminating hole into which the discriminating member is inserted. In the disc cartridge for receiving the disc that is asymmetric in cross-sectional form with respect to the center line of the disc in the thickness direction, A disk housing having a hole for inserting and ejecting the disk into the disk housing, and further having two rib-shaped retainers extending from the hole to the disk housing, the holes having an asymmetrical cross-section of the disk; Since the holes are formed to have substantially the same shape, the hole is provided with a cartridge body configured to receive the disc only at one orientation corresponding to a state that allows recording and / or playing of the disc; An opening / closing device including a take-out inhibiting mechanism for opening / closing the hole and designating whether or not recording is possible on the disc, The take out prohibition mechanism, In a state of prohibiting take-out of the disk from the cartridge body, it is mounted so as to be movable on the opening / closing device to designate whether recording on the disk is possible, and furthermore, through a control hole when designating a recording prohibited state. A discriminating member mounted to move to the exposed first position and to move to the second position exposed through the control hole when designating the recordable state; And the discriminating member is in contact with the disk to receive the disk when moved to the first position. The method of claim 6, And the hole has a shape corresponding to the cross-sectional shape of the disc to allow insertion and ejection of the disc only in a state that permits recording and / or reproduction of the disc. The method of claim 6, And the aperture includes a support portion used to lock the disc when the disc is inserted without permitting recording and / or playback of the disc. The method of claim 6, And the opening is formed on the side of the cartridge body, and the opening / closing device includes an opening / closing member rotatably mounted to the cartridge body to open / close the opening. The method of claim 6, And the opening / closing movement of the opening / closing mechanism is prohibited when the takeout prohibiting mechanism designates a state which prohibits recording on the disk. The method of claim 10, And the discriminating member is mounted to move between a first position specifying a state of prohibiting recording on the disc and a second position specifying a recordable state on the disc. The method of claim 11, The cartridge body is a disc cartridge comprising a discrimination hole into which the discriminating member is inserted.