JP2007012201A - Information recording medium cartridge, information recording medium loading method, and information recording medium recording / reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cartridge of a thin information recording medium of which the recording capacity is improved more than that of a conventional system, and a method for loading an information recording medium from the cartridge. <P>SOLUTION: The cartridge has such constitution that the information recording medium and a partition member are superposed alternately and almost closely, and identification of a housing position of each information recording medium and loading operation can be performed by a tab formed in the partition member end part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cartridge that accommodates a plurality of thin information recording media, and more particularly to a method for loading an information recording medium accommodated in the cartridge, and a recording / reproducing apparatus including such a loading mechanism.

  In recent years, the information society has advanced and the recording density of external storage devices for storing a large amount of information has been greatly improved. In order to meet the demand for higher density in the field of optical discs, multilayer recording is possible by reducing the light spot size by shortening the wavelength of the laser and increasing the numerical aperture of the objective lens, and by increasing the transmittance of the recording layer. There are many studies on how to make it. However, at present, the method for increasing the capacity by miniaturizing the light spot diameter and increasing the number of recording layers is close to the physical limit.

  Therefore, recently, in order to increase the storage capacity of the optical disk, researches on methods for increasing the volume recording density by multilayer recording or hologram recording have been actively conducted. However, in multilayer recording, light is absorbed to some extent in each layer, so a configuration of several layers is considered realistic. In holograms, it is difficult to improve the recording density by narrowing the spot. With these technologies, terabytes (TB) ) Realization of a large-capacity optical disk of the class is extremely difficult.

  On the other hand, studies have been conducted to increase the volume recording density by reducing the thickness of the information recording medium. Generally, research and development of a recording / reproducing technique using an information recording medium made of a thin substrate having a thickness of about 0.1 mm is widely performed (see paragraphs 0022 to 0023 of Patent Document 1). In addition, a technique for accommodating the thin information recording medium in a cartridge format, a technique for taking out a thin disk from the cartridge, and recording / reproducing the disk have been developed.

  When a thin information recording medium is accommodated in a cartridge format, the information recording medium has flexibility, and thus a tray for holding each information recording medium is required in the cartridge. FIG. 17 shows a cross-sectional view of a cartridge containing a thin information recording medium. In this figure, a tray on which an information recording medium is placed is arranged on each rail (may be a simple protrusion) provided on the inner wall of the cartridge. Alternatively, the tray may be integrally formed with the cartridge.

Japanese Patent Application Laid-Open No. 2004-145993. Japanese Patent Application Laid-Open No. 2004-145995.

  In a cartridge type recording apparatus that accommodates a plurality of thin information recording media, in order to further increase the recording capacity, it is necessary to improve the volume recording density by reducing the thickness of the case or tray that accommodates the information recording medium. . In the system using the tray as shown in FIG. 17, since the thickness of the tray itself hinders the high density, a device for thinning the partition member between the information recording media is devised. In the disk cartridge described in Patent Document 1, thin information recording media are separated from each other by the sheet 5, and the adjacent sheets are repelled by the magnetic force of the magnet 6 installed at the end of the sheet 5, thereby providing a constant gap between the sheets. (See Fig. 2, summary, etc.). Further, in the disc changer device described in Patent Document 2, the partition members are not provided between the information recording media, but the convex portions 25 are provided on the inner peripheral portion and the outer peripheral portion of the information recording medium, so A certain interval is secured (see FIG. 17 and the like).

  However, even in the disk cartridges of Patent Documents 1 and 2, etc., in order to enable loading of the information recording medium by the recording / reproducing apparatus, a certain interval is secured between the information recording media so that the information recording medium can be easily gripped. There is a limit to improving the volume recording density. At present, it is extremely difficult to achieve a TB class recording capacity even with a cartridge system that accommodates a thin information recording medium.

  The present invention has been made in view of such circumstances, and in a cartridge containing a plurality of thin information recording media, in addition to the technology for increasing the recording capacity by increasing the volume recording density, The present invention intends to provide a technique for loading an information recording medium.

  As a result of diligent research in view of the above problems, the present inventor has found that the partition between the information recording medium and the information recording medium is not fixed without fixing the position of the partition member between the information recording media or securing a fixed interval between the partition members. The present invention has invented a cartridge configuration in which the members are alternately in close contact with each other and overlapped, and at the same time, invented a method suitable for loading a specific information recording medium from the cartridge.

  FIG. 1 is a sectional view of an information recording medium cartridge according to the present invention. As described above, by stacking the information recording medium and the partition member in close contact with each other, more information recording media can be accommodated in the cartridge as compared with the methods of FIG. 17 and Patent Documents 1 and 2. In addition, as shown in FIG. 2, a very short protrusion (a little larger than the thinness of the information recording medium) is provided at the end of the partition member so that the information recording medium and the partition member thereon are not in close contact with each other. A very slight space may be secured between the partition members.

  The present invention is a cartridge that is non-fixedly accommodated in a state where a plurality of thin information recording media and one or more partition plates are stacked, and at the end of each partition plate, There is provided a cartridge for an information recording medium characterized in that a corresponding unique tab is formed, and the partition plate at each receiving position can be accessed by accessing the tab. .

  In the information recording medium cartridge of the present invention, each partition plate is housed in the cartridge, and a part of the tab is exposed downward, and by accessing the exposed part from below, Any partition plate can be accessed. By accessing the tab exposed at a specific position from below, the partition plate at a specific storage position can be accessed.

  In the information recording medium cartridge of the present invention, the partition plate is formed with the tabs at two opposing linear ends, and the partition plates are stacked in a state where the information recording medium and the partition plate are laminated. The portions exposed downward are arranged in a matrix along a direction parallel to the two straight ends and a direction orthogonal to the two ends.

  In the information recording medium cartridge according to the present invention, the partition plate is formed with the tabs at two opposing arc-shaped ends, and the partition plate is formed by stacking the information recording medium and the partition plate. The portions exposed downward are arranged in a matrix along the circumferential direction and the radial direction of the two arcuate ends.

  In the information recording medium cartridge of the present invention, the tabs formed at the two ends of the partition plate have a symmetrical shape with respect to the center of gravity of the partition plate. Thereby, when the said partition plate is lifted by the said 2 end, it can lift with sufficient balance.

  The cartridge for information recording medium of the present invention is characterized in that the information recording medium and the partition plate are accommodated in a non-fixed state in an alternately stacked state. Thereby, the information recording medium can be loaded one by one.

  The present invention is also a method for loading an information recording medium from the above-described cartridge for information recording medium, wherein the tab of the partition plate accommodated immediately above the information recording medium to be loaded is accessed, and the tab is The present invention provides a method characterized in that the partition plate is lifted to lift and an information recording medium to be loaded is taken out.

  In the information recording medium loading method of the present invention, after accessing the tab of the partition plate accommodated immediately above the information recording medium to be loaded, the tab and the portion inside the tab of the partition plate are lifted. The partition plate is lifted.

  The present invention also provides an information recording medium recording / reproducing apparatus including the information recording medium cartridge described above and having a function of loading the information recording medium from the information recording medium cartridge by the loading method described above.

  As described above, according to the present invention, a cartridge having a higher volume recording density that accommodates a larger number of information recording media than the prior art is provided. In addition, a method for loading an information recording medium from the cartridge and a recording / reproducing apparatus using the cartridge are provided.

  Hereinafter, the best mode for carrying out the information recording medium cartridge, the information recording medium loading method, and the information recording medium recording / reproducing apparatus of the present invention will be described in detail with reference to the accompanying drawings. FIGS. 1-16 is a figure which illustrates embodiment of this invention, In these figures, the part which attached | subjected the same code | symbol represents the same thing, and the fundamental structure and operation | movement are the same. To do.

Figure cartridge accommodating the information recording medium 3 is a diagram showing a receiving state of the information recording medium in the cartridge for an information recording medium of the present embodiment. As shown in the drawing, in the cartridge, thin partition plates and information recording media are accommodated in an alternately overlapping state. As described above, the adjacent partition plate and the information recording medium may be in close contact with each other, or a projection may be provided on the partition plate to ensure a very small interval between the adjacent partition plates. .

  FIG. 4 is a diagram schematically showing the configuration of the partition plate shown in FIG. As shown in the drawing, tabs for identifying each partition plate at the time of medium loading are formed at two opposing ends of the partition plate. In the present embodiment, tabs having different shapes are formed on the partition plates of the same cartridge (described later).

  FIG. 5 is a diagram schematically showing a side shape formed by a tab of the partition plate in a state where a plurality of partition plates and an information recording medium are accommodated in a cartridge. In this figure, the end of the overlapped partition plate is shown as a perspective view seen from below, and the information recording medium is not shown. As shown in the drawing, each partition plate has tabs having different widths and depths.

  FIG. 6 is a view showing the shape of the tab formed on each partition plate in the cartridge. In FIG. 6, a tab having a small width and a short depth is formed at the right end of the lowermost partition plate, and a tab having the same width and a little longer depth is formed on the second partition plate from the bottom. Furthermore, tabs that are the same width as the tabs of the lowermost partition plate and a little longer than the partition plate that is one step lower are formed on the third, fourth, and fifth partition plates. The sixth-stage partition plate is formed with tabs that are wider than the bottom-stage partition plate tabs but have the same depth, and the seventh- to tenth-stage partition plates have the same tabs as above. Each of them is the same width as the 6th tab and the depth is slightly longer than that of the partition plate 1 level below. Thereafter, it is assumed that the shape of the tab changes in the same manner for every five partition plates, ie, the 11th to 15th stages, the 16th to 20th stages, and so on. The uppermost partition plate is formed with tabs that are substantially the same width as the partition plate and have the longest depth (the same depth as the tabs of the fifth and tenth partition plates).

  As shown in FIG. 5, when the partition plates on which tabs of different shapes are formed are overlapped as seen from below, a certain region on the lower surface of the tabs of all the partition plates can be seen. . That is, different areas on the lower surface of the tabs of the overlapping partition plates are exposed downward, and in order to access a specific partition plate in a state where a plurality of partition plates overlap, access the exposed portion of the partition plate. You can do it.

  In this example, the tabs of the partition plate may have different depths in 5 stages and widths in 20 stages, so that 100 different tab shapes can exist. That is, 100 partition plates can be used in one cartridge. Moreover, the same tab shall be formed also in the other end of each partition plate.

  In addition, in this embodiment, although the edge in which the tab of a partition plate is formed is a straight line, even if it is a circumferential edge, a tab can be formed similarly.

Method for Loading Information Recording Medium from Cartridge Next, a method for loading the information recording medium from the cartridge for information recording medium of the above-described embodiment will be described.

  As shown in FIG. 7, the cartridge for information recording medium of this embodiment is composed of a cartridge body and a cartridge lid, and a protrusion formed at the lower part of the cartridge lid is used as a fixing member formed on the cartridge body. Both are fixed by engaging. When loading the information recording medium, the cartridge lid is slightly slid in the horizontal direction (the depth direction in FIG. 7) to release the engagement between the protrusion and the fixing member, and then the cartridge lid is moved upward. The information recording medium accommodated in the cartridge main body can be accessed by moving it to the position and removing it.

  8 and 9 are a side sectional view and a top view showing an internal configuration of an apparatus (for example, configured as a part of a recording / reproducing apparatus) for loading an information recording medium from an information recording medium cartridge according to the present embodiment. It is sectional drawing. In this apparatus, when a cartridge is inserted or an information recording medium is instructed to be loaded, as shown in FIG. 8, the lid of the cartridge is removed upward by a lid detaching device in the upper part of the apparatus. Loading of the information recording medium is performed by the conveying devices 1 to 3 provided in the apparatus.

  In order to load a specific information recording medium, first, the other information recording medium and the partition plate above the information recording medium must be lifted to expose the information recording medium to be loaded. In order to lift the other information recording medium and the partition plate, the arms of the transport apparatuses 1 and 2 are moved to predetermined positions, and the tab of the partition plate immediately above the information recording medium to be loaded is lifted from both sides. At this time, the two arms are preferably lifted in a state where the partition plate and the uppermost partition plate or the information recording medium are sandwiched and fixed.

  As shown in FIGS. 5 and 6, since all the partition plates in the cartridge have different tab areas exposed downward, the information recording medium to be loaded by the arms of the transport apparatuses 1 and 2 respectively. If the exposed portion of the partition plate immediately above is lifted, the other information recording medium and partition plate above the information recording medium to be loaded can be lifted. In addition, as described above, the partition plate has tabs of the same shape at both ends, so the position where the two arms lift the partition plate is a symmetric position with respect to the center of gravity of the partition plate. Can be lifted in a balanced manner.

  Thus, when the upper surface of the information recording medium to be loaded is exposed and a certain space is secured on the upper surface, the arm of the transport device 3 enters the space, holds the information recording medium to be loaded and holds it horizontally. Transport in the direction. The arm of the transport device 3 is provided with a member that can vacuum-suck the upper surface of the information recording medium. The information recording medium gripped by the arm of the transport device 3 is transported to the recording / reproducing unit and loaded.

  In the information recording medium cartridge of the present embodiment, as much information recording medium as possible is accommodated in order to improve the recording capacity. For this purpose, it is necessary to make the partition plate and its tab as thin as possible. Moreover, the area of the exposed part of the tab of each partition plate will become small with the increase in the number of sheets accommodated. Then, in the loading method described above, the arms of the transport apparatuses 1 and 2 are thin and the information recording medium and the partition plate are lifted only by the exposed portions of the tabs having a small area. The tab may vibrate and fall due to external disturbances.

  Therefore, as a further improved aspect of the method of loading the information recording medium of the present embodiment, after accessing the exposed portion of the lower surface of the tab of the partition plate to be lifted by the respective arms of the transport apparatuses 1 and 2, only the exposed portion is used. Instead of lifting, the lower surface of the inner partition plate may also be lifted. Specifically, with the arm tip in contact with the exposed portion of the lower surface of the tab of the partition plate to be lifted, the arm tip is moved inward of the partition plate, and between the partition plate and the partition plate immediately below it. It is only necessary to lift it after sliding it in. Thus, the volume recording density of the information recording medium cartridge can be improved while ensuring the safety of the loading operation.

  Moreover, you may provide the hand for pinching | interposing a partition plate in the arm tip of each of the conveying apparatuses 1 and 2 as another aspect.

  The embodiments of the information recording medium cartridge, the information recording medium loading method, and the information recording medium recording / reproducing apparatus according to the present invention have been described above. In implementing the present invention, configurations other than the above-described examples are described. Or take a way. For example, in an information recording medium cartridge, a partition plate and an information recording medium are not alternately accommodated one by one, but a plurality of information recording media are arranged between the partition plates, and the superimposed information is loaded at the time of loading. The recording media may be taken out one by one from the top.

Other Embodiments of Partition Plate and Loading Method Further, other embodiments of the configuration of the partition plate and the loading method will be described. 10 and 11 are diagrams showing a modification of the partition plate shown in FIGS. 3 to 6 and a method for loading the same. In FIG. 10, the partition plate has a pair of unique tabs at each end. Each of the pair of unique tabs has substantially the same size and shape, and is formed so that both have a certain positional relationship. As shown in FIG. 11, in a state in which the partition plate and the information recording medium are stacked, an arm member for lifting each of the pair of tabs formed at both ends of each partition plate is applied from below, so that the arm A particular partition plate with tabs corresponding to the horizontal position of the member can be lifted. It should be noted that any number of tabs can be repeatedly formed at each end of the partition plate.

  12 and 13 are diagrams illustrating an example in the case where a circular partition plate is used. In FIG. 12, a pair of arc-shaped tabs that are substantially symmetrical with respect to the center thereof are formed on the peripheral edge of the circular partition plate. The tab can be formed as a tab unique to each partition plate having different dimensions in the circumferential direction of the circular partition plate. As shown in FIG. 13, in a state where the partition plate and the information recording medium are stacked, an arm member for lifting each of the pair of tabs formed on the peripheral edge portion of each partition plate is applied from below, so that the arm A specific partition having a tab corresponding to the rotational position of the member can be lifted. Note that any number of tabs can be repeatedly formed on the peripheral edge of the partition plate. Further, if the portion of the arm member that holds the tab can be expanded and contracted, it is possible to select and lift the partition plate formed with tabs having different dimensions not only in the circumferential direction but also in the radial direction.

Example 1
A dye is applied as a recording film on a polycarbonate substrate with an inner diameter of 15 mm, an outer diameter of 120 mm, and a thickness of 0.1 mm. After a silver reflective film is formed by magnetron sputtering, a UV resin is applied as a protective film by spin coating. A recording medium was produced.

  A square having a length and width of 150 mm and a thickness of 0.1 mm was cut into the shape shown in FIG. 4 to form the same shape (a shape unique to each partition plate) at the two ends. Tabs were formed at 10 mm from each end. Following the example shown in FIGS. 5 and 6, 100 partition plates were produced. When these are overlapped, the part of the tab of each partition plate exposed downward becomes a rectangular area of 7.5 mm × 2.0 mm.

  The cartridge was made of plastic and produced as a cartridge body and a cartridge lid, similar to the example shown in FIG. As shown in FIG. 14, two arc-shaped protrusions having a diameter slightly larger than the outer circumference of the information recording medium are formed on the inner surface of the cartridge body so that the information recording medium near the lowermost layer can be fixed. At the same time, four protrusions are formed so that the arc-shaped cut portion of the partition plate can be fitted. When 100 information recording media and 100 partition plates were alternately stacked, the total thickness was 20 mm, so the cartridge body height was 2.2 cm.

  As for the loading mechanism of the information recording medium, a loading device was manufactured according to the example shown in FIGS. A hand for sandwiching the partition plate was provided at the tip of the arm for lifting the partition plate. When a cartridge containing 100 information recording media and 100 partition plates is inserted into this loading device, the cartridge lid is removed upward by the lid detaching device so that the arms of the transport device can access both sides of the overlapping partition plate. Become. When a loading command for a specific information recording medium is input, the arm of the transport device accesses the exposed portion of the tab of the partition plate immediately above the information recording medium, sandwiches the exposed portion with a hand, and lifts it upward. Subsequently, another conveying device accesses the information recording medium with the upper surface exposed, and vacuum-sucks it to move it to a predetermined position outside the cartridge. Thereafter, the information recording medium is returned to the cartridge, and the information recording medium being lifted and the partition plate are again placed on the returned information recording medium, whereby the cartridge returns to the initial state.

  As described above, an information recording medium cartridge having a high volume recording density and a loading method of the information recording medium have been realized.

Comparative Example As a comparative example, an information recording medium cartridge using a conventional tray system as shown in FIG. 17 will be examined. In this tray system, since each tray is held by the protrusion on the inner wall of the cartridge, it is necessary to have rigidity that can withstand its own weight. Even if the tray is made of 0.1 mm paper to make the tray thinner, it is bent by its own weight and cannot be held in the cartridge. Therefore, in order to make the tray as thin and rigid as possible, a tray with a thickness of 0.3 mm by stainless processing as shown in FIG. 15 was produced. A recess with a depth of 0.1 mm is formed in the center to accommodate an information recording medium with a thickness of 0.1 mm. Further, a cartridge having a tray holding protrusion as shown in FIG. 17 on the inner wall surface was prepared, and the tray was inserted. The distance between the trays was 0.2 mm. Therefore, in this tray type information recording medium cartridge, a space of 0.2 mm + 0.3 mm = 0.5 mm is required in the thickness direction to accommodate one information recording medium. If a cartridge having a height of 2.2 cm as in the first embodiment is used, only 44 information recording media can be accommodated. That is, it can be seen that the information recording medium cartridge of Example 1 has a capacity of the information recording medium more than twice that of the conventional tray system.

Example 2
After cutting a paraffin paper having a length and width of 150 mm and a thickness of 0.02 mm into the shape shown in FIG. 4, the remaining portion where the information recording medium is placed as shown in FIG. The same 0.1 mm-thick paper as used in Example 1 was pasted on (indicated by hatching). A tab can be formed at each end of the pasted paper according to the number of information recording media accommodated. A cartridge containing an information recording medium was produced using the partition plate thus produced and the same information recording medium and cartridge produced in Example 1. At this time, since the portion of the partition plate that is in contact with the information recording medium is thin, the interval between the partition plates is narrowed, and the portions of the adjacent partition plates to which the paper is pasted are almost in contact with each other.

  In this embodiment, a space of 0.1 mm + 0.02 mm = 0.12 mm is required in the thickness direction to accommodate one information recording medium in the cartridge. Since the cartridge has a height of 2.2 cm, 180 information recording media can be stored in one cartridge. The information recording medium can be loaded by the same method as in the first embodiment. Thus, if the portion of the partition plate on which the information recording medium is placed is made thinner, the capacity of the information recording medium can be increased by more than three times compared to the conventional tray method shown in the comparative example. it can.

Example 3
A square having a length and width of 140 mm and a thickness of 0.1 mm was cut into the shape shown in FIG. 4, and tabs were formed at portions from each end to 5 mm. Similar to the first embodiment, tabs having unique shapes are formed on 100 partition plates, and therefore, a portion of each partition plate that is exposed downward is a rectangular region of 7.0 mm × 1.0 mm. Using the partition plate thus produced, the same information recording medium as produced in Example 1, and a cartridge smaller than that in Example 1, a cartridge containing 100 information recording media was produced. did.

  In the same loading apparatus as used in Example 1, when loading of the information recording medium was attempted by the same method, the number of the partition plates and the information recording medium lifted in the cartridge by the rotational vibration of the spindle of the recording / reproducing unit. The phenomenon that the sheet fell into the cartridge occurred. This is considered to be because the area of the portion gripped by the arm of the partition plate is made too small.

  Therefore, after the tip of the arm of the transport device accesses the exposed portion of the tab of the partition plate immediately above the information recording medium to be loaded, the exposed portion of the tab is lifted by about 1 mm. Since the partition plate of the present embodiment is made of paper with low rigidity, the partition plate bends and only the vicinity of the exposed portion of the tab is lifted. That is, only a part of the weight of the information recording medium to be lifted and the total weight of the partition plate is applied to the end of the arm of the transport device. In this state, the arm was moved about 5 nmm toward the inside of the partition plate, and then the information recording medium and the partition plate were lifted. By doing so, the lifted information recording medium and the partition plate are not dropped even by the rotational vibration of the spindle of the recording / reproducing unit.

  The information recording medium cartridge, the information recording medium loading method, and the information recording medium recording / reproducing apparatus according to the present invention have been described with reference to the specific embodiments. However, the present invention is not limited thereto. is not. A person skilled in the art can make various changes and improvements to the configurations and functions of the invention according to the above-described embodiments or other embodiments without departing from the gist of the present invention. In particular, the size, shape, material, processing, and operation method of the loading device of the information recording medium, partition plate, and cartridge housing, and the operation method of the loading device may be appropriately changed so that the effects of the present invention are exhibited.

It is sectional drawing of the cartridge for information recording media of this invention. It is sectional drawing of the cartridge for information recording media of this invention. It is a figure which shows the accommodation state of the information recording medium in one Embodiment of the cartridge for information recording media of this invention. It is a figure which shows schematically the structure of the partition plate shown in FIG. It is a figure which shows roughly the side surface shape which the tab of a partition plate forms in the state in which the some partition plate and the information recording medium were accommodated in the cartridge in piles. It is a figure which shows the shape of the tab formed in each partition plate in a cartridge. It is a figure which shows the structure of the housing | casing of the cartridge for information recording media of this invention. It is side surface sectional drawing which shows the internal structure of the apparatus for loading an information recording medium from the cartridge for information recording media of this invention. It is a top sectional view showing an internal configuration of an apparatus for loading an information recording medium from an information recording medium cartridge of the present invention. It is a figure which shows the other aspect of the cartridge for information recording media of this invention. It is a figure which shows the other aspect of the cartridge for information recording media of this invention. It is a figure which shows the other aspect of the cartridge for information recording media of this invention. It is a figure which shows the other aspect of the cartridge for information recording media of this invention. FIG. 4 is a view showing an inner bottom surface of a cartridge body in which an information recording medium and a partition plate fixing protrusion are formed as an embodiment of the present invention. It is a figure which shows the shape of the tray by stainless steel produced as a comparative example with respect to the Example of this invention. It is a figure which shows the production method of the partition plate used for the cartridge for information recording media as an Example of this invention. It is a figure which shows the cross section of the cartridge which accommodated the conventional thin information recording medium.

Claims (9)

A cartridge in which a plurality of thin information recording media and one or more partition plates are stacked in a non-fixed state,
A unique tab corresponding to the accommodation position is formed at an end of each partition plate, and it is possible to access the partition plate at each accommodation position by accessing the tab. An information recording medium cartridge.   Each partition plate is in a state where a part of the tab is exposed downward while being accommodated in the cartridge, and any partition plate can be accessed by accessing the exposed portion from below. The information recording medium cartridge according to claim 1, wherein the cartridge is an information recording medium cartridge. The partition plate is formed with the tabs at two opposing linear ends,
In the state where the information recording medium and the partition plate are laminated, the portions exposed downward of the partition plates are arranged in a matrix along a direction parallel to the two straight ends and a direction perpendicular to the linear ends. The information recording medium cartridge according to claim 2. The partition plate is formed with the tabs at two opposing arc-shaped ends,
In the state where the information recording medium and the partition plate are laminated, the portions exposed downward of the partition plates are arranged in a matrix along the circumferential direction and the radial direction of the two arcuate ends. The information recording medium cartridge according to claim 2.   5. The information recording medium cartridge according to claim 3, wherein tabs formed at two ends of the partition plate have a symmetrical shape with respect to a center of gravity of the partition plate.   6. The information recording medium cartridge according to claim 1, wherein the information recording medium and the partition plate are stored in a non-fixed state in an alternately stacked state. A method for loading an information recording medium from the information recording medium cartridge according to any one of claims 1 to 6,
A method of accessing a tab of a partition plate housed immediately above an information recording medium to be loaded, lifting the tab to lift the partition plate, and taking out the information recording medium to be loaded. The loading method according to claim 7,
After accessing the tab of the partition plate stored immediately above the information recording medium to be loaded,
A method of lifting the partition plate by lifting a portion inside the tab and the tab of the partition plate. An information recording medium cartridge according to any one of claims 1 to 6,
9. An information recording medium recording / reproducing apparatus having a function of loading an information recording medium from the information recording medium cartridge by the loading method according to claim 7.

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