JP2002298544A - Recording medium cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cartridge which makes bright image printing possible with high accuracy by using a CO2 laser marker which is lower in cost and lower in output than a YAG laser printer. SOLUTION: The cartridge in which a recording medium 6 is housed is provided with an imprinting layer (image printing layer) 41 of the color different from the texture of a cartridge base material (blank) and this imprinting layer 41 is dissolved and annihilated by irradiation with a laser to put the ground color, etc., of the cartridge base material into relief, by which the diversified image printing of the high brightness and high accuracy is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk cartridge containing a recording medium such as a magnetic disk, an optical disk or a magneto-optical disk as a recording medium for various kinds of information and data such as image information and audio information, and more particularly to a disk cartridge.
Disc cartridge having a marking portion (printing portion) on which a product or individual management code, such as a product name, model, code number, code, or lot number, printed on a cartridge (case) is stamped by a laser printer. It is.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 11, a product management code 102 is attached to a disk cartridge 101 containing a recording disk such as an optical disk or a magneto-optical disk. The product management code 102 is a series of characters and numbers indicating a production number (lot number, etc.), a product name, and a model name. In the final production process, an information signal recorded on the back surface of the cartridge, for example, a recording medium by a customer. Sticking unit 10 for sticking a label indicating the contents of
3 is printed.

[0003] The product management code 102 is written by the producer for some kind of identification. It is not necessary for the user to recognize the product management code 102 or to improve the merchantability. Are displayed at the minimum discrimination level sufficient for discrimination.

[0004] As a method of printing the product management code 102, a method using a rubber plate, a method using an ink jet printer, and a method using a laser marker are known.

[0005] The printing (printing) method using the rubber plate is such that a rubber plate is attached to the surface of a rotatable printing roller, and the rubber plate is pressed against an ink pad soaked with immortal ink to adhere the immortal ink to the back of the cartridge. The product management code 102 is transcribed and printed by pressing the product management code 102 against a corner in the label attaching section 103.

The printing method using the ink jet printer is a method of performing printing by ejecting ink particles from a nozzle onto a printing surface of the cartridge 1. In this method, it is possible to print appropriate characters and the like by variously controlling the opening and closing of the nozzle, and to change the product management code 102 to be printed by controlling the opening and closing of the nozzle by a computer. Can respond quickly.

In the printing method using the laser marker, the product management code 102 is printed by irradiating a laser to the surface of the cartridge and dissolving a part of the surface of the material constituting the cartridge. By controlling the laser oscillation output in various ways, it is possible to print appropriate characters and the like, and the printed content can be controlled by a computer in the same manner as the above-mentioned ink jet printer.
Can be quickly responded to even when changing. Further, since the work can be performed without using an auxiliary material such as ink as in an ink jet printer, it is advantageous in terms of handling and maintenance. Further, by using a laser, finer and more versatile printing can be performed as compared with an ink jet printer.

[0008]

However, the above-mentioned method using a rubber plate, a method using an ink jet printer, and a method using a laser marker have the following problems, respectively.

In the printing method using the rubber plate, the rubber plate must be replaced every time the product management code 102 is changed, and the rubber plate is pressed against the printing surface of the cartridge by a constant pressing force to secure the printing accuracy. And the adjustment is troublesome. In the printing method using the rubber plate,
Since the location where the product management code 102 is printed must be a flat surface, printing must be performed on the flat surface of the cartridge, and the printing location is limited.

Furthermore, recently, the product management code 102
In addition to this, it has been considered that a unique number is printed on the cartridge and a display is provided so that the user can actively use the file for filing or recording. The serial number of each production lot is not the same number like the serial number of the product, but a unique number is displayed for each product, or a serial number is printed for each product. In such a case, a printing method using a rubber plate is inconvenient to cope with.

[0011] A printing method using an ink jet printer is used for a cartridge having a fine uneven surface formed by applying a graining treatment or a satin finish to the surface for the purpose of preventing scratches or improving the design appearance. When applied, the ink particles sprayed from the nozzle of the ink jet printer adhere in accordance with the shape of the fine uneven surface on the surface of the cartridge, and are infiltrated into the fine uneven surface as if they were fine. It becomes difficult to print characters and patterns. Also, when the product management code is printed with ink of the same color as the base material of the cartridge, due to the shape of the fine uneven surface of the cartridge,
The product management code 10 in which the reflected light from the ink layer and the reflected light from the cartridge substrate are printed in substantially the same direction.
2 becomes difficult to identify. In recent years, devices such as audio, video, and office computers using the cartridge have been fashioned, and accordingly, cartridges having various colors are demanded. In such a case, in order to change the color tone of the ink so as to facilitate the identification of the product management code 102 in accordance with the color tone of the cartridge and perform printing, a plurality of printers corresponding to the color tone of the cartridge are prepared. There is a need.

A printing method using a laser marker is as follows.
A part of the surface of the material (material) constituting the cartridge is melted, and the difference between the surface states of the melted part and the non-melted part, that is, identification is performed by engraving. There is a problem that the printed character lacks visibility because there is no color difference between the characters. Further, when the difference between the surface state of the melted portion and the non-melted portion, that is, the depth of the mark is increased to improve the visibility, a high-output laser, for example, a YAG laser is used, or It is conceivable to lengthen the laser irradiation time. However, high power laser markers, such as YAG laser markers, are expensive. In addition, if the laser irradiation time is lengthened, the characters tend to be unclear and it becomes difficult to print fine characters.

An object of the present invention is to provide a cartridge which enables clear and high-precision printing even when using a carbon dioxide laser printer which is inexpensive and has a low output as compared with a YAG laser printer.

[0014]

According to the present invention, in order to achieve the above-mentioned object, a part of a cartridge accommodating a recording medium is provided with an engraved layer of a synthetic resin ink of a color different from the base material of the cartridge. (Printing layer), a part of the engraved layer is dissolved and annihilated by laser irradiation, and the color and the like of the cartridge substrate (material) emerge from the dissolved and annihilated part, so that sharpness is high, and High precision and various printing are enabled.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A disk cartridge according to the present invention will be described below with reference to the drawings. First, the disk cartridge 1 of the present invention
The overall structure will be described.

As shown in the perspective view on the front side in FIG. 1, the perspective view on the back side in FIG. 2, and the exploded perspective view in FIG. 3, the disk cartridge 1 has a substantially rectangular shape by injection molding synthetic resin or the like. An upper half 2 and a lower half 3 formed on the cartridge body 5 are abutted with each other and connected using a plurality of fixing screws 4... 4. A magneto-optical disk 6 serving as a recording medium for information signals is provided in the cartridge body 5. It is stored.

The upper and lower halves 2 and 3 constituting the cartridge body 5 are formed by injection molding a thermoplastic synthetic resin such as a polycarbonate resin, an ABS resin, and a polystyrene resin colored in blue (light blue).

The magneto-optical disk 6 housed in the cartridge body 5 is formed by providing a recording layer made of a magnetic layer or the like on a disk substrate made of a synthetic resin material such as glass or polycarbonate resin having optical transparency. .

As shown in FIG. 3, a center hole 6a is formed in the center of the magneto-optical disk 6, and a center hub 7 is attached so as to cover the center hole 6a. The center hub 7 is formed of a magnetic material such as a metal, and is provided on the disk rotation drive mechanism when the magneto-optical disk 6 is mounted on the disk rotation drive mechanism disposed on the disk recording and / or reproduction apparatus side. Magnetically attracted by the magnet.

In the center of the lower half 3, there is formed a circular center opening 8 which faces a center hub 7 attached to the center of the magneto-optical disk 6 housed in the cartridge body 5 outward. I have.

At the positions where the upper and lower halves 2 and 3 are opposed to each other, there are first and second radially outwardly facing at least a part of the signal recording area of the magneto-optical disk 6 housed in the cartridge main body 5. Second recording and / or reproducing openings 9 and 10 are formed. These recording and / or reproducing openings 9, 10 are located substantially at the center in the left-right direction of the cartridge body 5, and from the position near the center opening 8 to the position near the front walls 11, 12 of the cartridge body 5. It is formed in a substantially short shape throughout.

The recording and / or recording provided on the lower half 3 side
Alternatively, the reproduction opening 8 is formed continuously with the central opening 10. A shutter member 13 for opening and closing the central opening 8 and the recording and / or reproducing openings 9 and 10 is movably attached to the cartridge body 5.

The shutter member 13 is formed by punching and bending a thin metal plate into a predetermined shape. As shown in FIG. A first shutter unit 14 for opening and closing a first recording and / or reproducing opening 9 formed in
A second shutter that is longer than the first shutter unit 14 that opens and closes the second recording and / or reproducing opening 10 and the central opening 8 formed on the lower surface side of the cartridge main body 5, that is, the lower half 3. A connecting plate 16 for connecting the base 15 and the base end sides of the first and second shutter sections 14 and 15 so that the first and second shutter sections 14 and 15 are substantially parallel to each other. And is formed in a substantially U-shape.

The shutter member 1 formed as described above
3 is a first shutter unit 1 as shown in FIGS.
4 to the first recording and / or reproducing opening 9,
The second shutter portion 15 extends from the second recording and / or reproducing opening 10 onto the central opening 8 and is superposed on the outer surface of the cartridge body 5 from the front wall 12. Shutter member 13 superimposed on the outer surface of cartridge body 5
The connecting plate 16 is fixed with screws 18, 18 to a slider 17 movably mounted along the front walls 11, 12 of the cartridge body 5.
And is attached to the cartridge body 5 so as to be movable integrally with the slider 17.

The shutter member 13 attached to the cartridge body 5 via the slider 17
The first and second recording and / or reproducing openings 9 and 10 are opened and closed in accordance with the movement of the moving member 7 in the directions of arrows a and b in FIGS. 1 and 2.

As shown in FIGS. 1 and 2, first and second recording and / or reproducing openings 9 and 1 are formed on the upper and lower surfaces of the cartridge body 5 to which the shutter member 13 is attached.
The shutter moving recesses 20 and 21 are formed in a concave shape from the peripheral edge of the central opening 8 to the one side wall 33 of the cartridge main body 5. A moving recess 22 corresponding to the thickness of the connecting plate 16 is also formed on the front wall 12 side of the cartridge body 5 over the moving range of the shutter member 13. The shutter member 13 is arranged such that the first and second shutter portions 14 and 15 are located in the shutter moving recesses 20 and 21, and the connecting plate 16 is located in the moving recess 22 so that the peripheral surface of the cartridge body 5 is formed. It can be attached almost flush without protruding from it.

The long second shutter portion 15 of the shutter member 13 tilts when the shutter member 13 is moved,
Alternatively, there is a possibility that the cartridge may rise from the cartridge body 5.

Therefore, the tip 1 of the second shutter 15
5 a is inserted between the shutter guide plate 23 attached to the lower half 3 and the lower half 3 along the one side of the shutter moving recess 21, and the cartridge body is 5 is prevented from rising.

The shutter member 13 movably attached to the cartridge body 5 is
1 and 2 in which the central opening 8 and the first and second recording and / or reproducing openings 9 and 10 are closed by a torsion coil spring 24 which is an urging member disposed therein. It is urged in the direction b. The above-mentioned torsion coil spring 24
Is disposed at one corner 5a of the cartridge body 5 which is located when the shutter member 13 releases the central opening 8 and the first and second recording and / or reproducing openings 9, 10.

The torsion coil spring 24 has one end engaged with the cartridge body 5 and the other end measured with the shutter member 13.
The shutter member 13 closes the central opening 8 and the first and second recording and / or reproducing openings 9 and 10 by being locked to a spring engaging upper portion provided on a slider 17 to which the slider 17 is attached. It is urged in the direction of arrow b in FIGS.

As shown in FIG. 3, the lower half 3 is provided with an opening 26 facing the erroneous recording prevention member 25.
A disk storage portion 27 for rotatably storing the magneto-optical disk 6 is provided on the inner surfaces of the upper half 2 and the lower half 3 opposite to each other.

The cartridge body 5 of the cartridge 1
A label sticking unit 2 for sticking a label 28 for writing and displaying the content of information recorded on the stored magneto-optical disk 6 on the main surface and the rear surface of the upper half 2 and the lower half 3 constituting
9, 30, 31 are provided. The label sticking section 2
9, 30 and 31 are formed in rectangular recesses slightly deeper than the thickness of the label 28, and when the label 28 is attached, the label 28 does not protrude from the surface of the cartridge body 5 and is substantially flush. It is becoming.

As shown in FIG. 4 and FIG. 5, a part of the back wall 32 of the cartridge body 5 having a blue background is used for engraving (hereinafter, referred to as "printing") with a laser marker. An imprint layer (hereinafter, referred to as a print layer) 41 of a synthetic resin ink is provided as a print area.

The printing layer 41 is substantially a commercially available vinyl / urethane-based heat-drying type ink (VIC ink manufactured by Seiko Advance Co., Ltd.) which is colored green (350 green) different from the cartridge body 5 by the silk printing method. It is formed in a horizontally long rectangular shape by printing to a thickness of 12 μm.

As shown in FIG. 6, the cartridge body 5 provided with the print layer 41 is
01 is sent to the position of the laser marker 202, and the print layer 41 is sent by the laser marker 202.
Are printed with letters and numbers 51 and the like.

The laser printer 202 includes a commercially available relatively inexpensive carbon dioxide laser marker (manufactured by Keyence Corporation / high-grade carbon dioxide laser marker ML-910).
0, 12 W, Class 4, wavelength 10.6 μm) at a printing speed of 800 mm / sec and an output of 80%.
As shown in FIGS. 7 and 8, when the English letters and numbers m were written, the printing layer 41 where the English letters and numbers were written dissolved and disappeared, and the English letters and numbers 51 were punched out. State.

Accordingly, the base of the cartridge 5 appears blue in the portion where the letters and numerals are written where the print layer 41 has dissolved and disappeared, and the green of the print layer 41 and the cartridge 5
The color difference from the blue color makes it easier and more reliable to identify the above-mentioned English characters and numerals 51.

Table 1 shows that the printing layer 41 has a printing speed of 30 using the carbon dioxide laser printer 202.
Three conditions of 0,500,800 mm / sec, output 80,6
2.5m character height at 5 levels of 0, 50, 40, 30%
The results of the identification test are shown in which five letters and numbers printed with m are visually recognized for 5 seconds from a position 30 cm away from 10 randomly selected observers. ○ indicates a result when 80% or more of the observers could be identified, Δ indicates a result when 50 to less than 80% of the examiners could be identified, and X indicates a result when less than 50% of the examiners could be identified. .

[0039]

[Table 1]

Table 2 shows the rear wall 32 of the cartridge body 5.
Directly above the carbon dioxide laser marker 2 on the blue ground
02 is the result of an identification test on a sheet printed under the same conditions and at the same level as described above.

[0041]

[Table 2]

As is clear from Tables 1 and 2, the print layer 41 printed with the carbon dioxide laser marker 202 has a print speed of 300, 500, 800.
mm / sec, output 80, 60, 50, 40, 30
In all of the five levels of%, 80% or more of the observers could be identified, whereas those directly printed on the background of the rear wall 32 of the cartridge 5 had a laser output at a printing speed of 300 mm / sec. 50 to 8 in the case of 30%
0% identification rate, 50-80% at laser output 50% or less at printing speed 500mm / sec.
And the printing rate is 800 mm / sec.
In the case of a laser output of 50 to 60%, 50 to 8
When the discrimination rate was 0% and the laser output was 30 to 40%, the result was that 50% of the observers could not discriminate.

The ink used for the printing layer 41 is not limited to the heat-drying type inks exemplified above, and its main material is not only vinyl / urethane, but also acrylic, urethane, and epoxy. Among these commercially available inks, those suitable for the material of the cartridge can be appropriately selected in view of characteristics such as adhesion after printing. Also,
The drying and curing type of the ink is not limited to the heat drying type, but may be an ultraviolet curing type, a room temperature curing type, or the like. The color of the ink used for the printing layer 41 is not limited to green and can be freely selected. However, when the same color as that of the cartridge base is selected, the printing layer 41 appears as characters and numerals. Since there is no color difference from the base material of the cartridge, it may be difficult to identify the cartridge base. The printing method of the printing layer 41 is not limited to silk printing, but may be pad printing or another transfer printing method.

In the above embodiment, the printing layer 41 is set to approximately 12 μm
The thickness of the print layer 41 is preferably in the range of 5 to 25 μm. When the print thickness is 5 μm or less, the concealment of the base material of the cartridge may be incomplete, and when the print thickness is 25 μm or more,
A bulge occurs around the letters and numbers, which causes the sharpness of small letters to decrease.

The area of the printing layer 41 is not limited to a part of the rear wall 32 of the cartridge main body 5, but may be the main surfaces of the upper half 2 and the lower half 3 or the left and right sides of the cartridge 5. The surfaces 33 and 34, the main surface and the connecting portion of the shutter member 13, and the upper surface of the shutter guide plate 21 may be used, and can be appropriately selected depending on the design of the cartridge, the printing purpose, and the like. The printing on the printing layer 41 may be not only characters or numbers, but also a product identification code such as a bar code, a pattern, a logo mark, or the like.

Second Embodiment FIG. 9 is a perspective view showing a main part of a second embodiment, and FIG. 10 is a sectional view taken along the line CC of FIG.

In this embodiment, next to the label sticking portion 31 provided on the rear wall 32 of the cartridge 5,
The color of the cartridge body 5 (blue) by silk printing
A commercially available vinyl / urethane-based heat-drying type ink that is colored green and is different from that in a horizontal rectangular printing thickness of about 10
A first printing layer (hereinafter, referred to as a first printing layer) 41 having a thickness of μm is formed, and a second printing layer 42 having substantially the same thickness as that of the first printing layer 41 is formed on the first printing layer 41. Printing was carried out with a color vinyl / urethane ink to obtain a printing area.

Using the carbon dioxide gas laser marker 202, a printing speed of 800 m
When an English character and a numeral having a character height of 2.5 mm are written at m / sec and an output of 40%, the second print layer 42 where the English character and the numeral are written is dissolved and disappears.

Accordingly, on the surface of the second printing layer 42, green English characters and numerals 51 appear due to the first printing layer 41 thereunder.

The first printing layer 41 and the second printing layer 42
, And the characters and numerals 51 can be easily and reliably identified. The case where the first printing layer 41 is green and the second printing layer 42 is blue, which is the same color as the cartridge main body 5, has an unnatural feeling as a whole cartridge due to the provision of the printing layer. This is not to limit the color to the same color as the cartridge body 5.

The first printing layer 41 and the second printing layer 42
If there is a color difference between the first print layer 41 and the second print layer 42 according to the overall design and other purposes, the identification of characters and numbers becomes easy and reliable. Is appropriately selected. In addition, the material of the ink is not limited to the first printing layer 41 and the second printing layer 42 which are the same as those of the same printing ink. Selected as appropriate.

The type of ink in the second embodiment,
The printing thickness, the printing method on the cartridge body, the printing content, and the like are the same as those in the first embodiment, and thus the duplicate description will be omitted.

As described above, when the second print layer 42 is made to be the same color blue as the cartridge main body 5, the laser output of the carbon dioxide laser marker 202 is too high, and the first print layer 41 If dissolved and extinguished, the blue background of the cartridge body 5 will appear, and it may be difficult to identify letters and numbers.
It is necessary to adjust the laser output low so that only the second print layer 42 dissolves and disappears. In the above embodiment, the case where the printing layer has the first and second two-layer structure is shown. However, the uppermost printing layer is dissolved and disappeared by changing the color of each layer to three or more layers. By doing so, the color of the underlying print layer may appear, and the uppermost print layer and the underlying print layer may be dissolved and annihilated to further reveal the color of the underlying print layer. .

Third Embodiment The purpose of this embodiment is to protect the resin base of the cartridge body 5 from laser. In this embodiment, in order to protect the resin base of the cartridge body 5, 20% by weight of fine powder of brass is added to the ink for forming the first print layer 41 and kneaded, and the thickness is approximately 10%.
The second print layer 42 was formed thereon by coating with a thickness of μm.

Then, the carbon dioxide laser marker 2
02, laser output 30, 40, 50, 60, 7
When printing was performed at six levels of 0,80%, at a laser output of 60% or less, only the second printing layer 42 was dissolved and disappeared, and the first printing layer 41 was not affected. At an output of 70% or more, the first print layer 41 was dissolved and annihilated, and the resin base of the cartridge body 5 was exposed.

On the other hand, in the case where the fine powder of brass was not added, the second
Dissolves and disappears only the first print layer 41 and has no effect on the first print layer 41. However, at a laser output of 50% or more, the first print layer 41 also dissolves and disappears, and the resin base of the cartridge body 5 is removed. Was exposed.

In the third embodiment, the addition and kneading of the ink for forming the first print layer 41 is for the purpose of obtaining a film for protecting the resin base of the cartridge body 5. It is not limited to the fine powders of brass illustrated, but inorganic fine particles (filler), fine powders of metals such as aluminum and stainless steel, titanium oxide,
Ceramic materials such as strontium aluminate oxide, or calcium carbonate, barium sulfate, zinc oxide, mica, kaolin, talc (magnesium silicate)
The shape of the fine powder may be spherical, scaly, needle-like, or the like, from the viewpoint of easy kneading with the ink. Further, the amount of addition is not limited to 20% by weight of the ink, and can be appropriately selected depending on the type of the ink, the type and the shape of the fine powder to be added.
In the following, the protective effect of the resin substrate becomes insufficient, the allowable range of the laser output becomes narrow, and the manufacturing conditions are limited. At 60% by weight or more, there is a concern that the adhesive strength of the cartridge to the substrate is reduced, so that 5% by weight to 60% by weight is within the allowable range of the filling amount of the ink, and preferably 10% by weight to 50% by weight. Weight percent.

As described above, the first print layer 41
When an inorganic skeleton (filler) is added to the ink for forming the ink, the surface of the thermoplastic resin constituting the cartridge body 5 is protected, and the second printing layer 42 is selectively dissolved and eliminated by a laser marker. Can increase the allowable range of the laser output.

In the embodiment, the magneto-optical disk 6
In the above description, the laser cartridge is used to print on the disk cartridge 1 containing a magnetic tape. However, in addition to the disk cartridge containing a magneto-optical disk, a magnetic tape cartridge containing a magnetic dave for recording voices, musical sounds or images, signals, etc. Needless to say, the present invention is applied to a video tape cartridge, a disk cartridge containing an optical disk or a floppy (registered trademark) disk, and a package mounting a semiconductor recording element.

[0060]

The recording medium cartridge of the present invention has the following effects.

(1) In the recording medium cartridge according to the first aspect, the base material of the cartridge appears by selectively dissolving and extinguishing the engraved layer, and characters and numerals of the background color of the base material of the cartridge are displayed.

(2) In the recording medium cartridge according to the second aspect, a part of the engraved layer can be dissolved and annihilated by a carbon dioxide gas laser (wavelength: about 10 μm) to make the cartridge base appear. Wavelength: about 1μ
m) A clear printing effect can be obtained without using a YOG laser or the like.

(3) In the recording medium cartridge according to the third aspect, characters, numerals, and the like can be clearly displayed by the color difference between the engraved layer and the base material of the cartridge.

(4) The recording medium cartridge according to the fourth aspect is capable of displaying characters, numerals, and the like in colors different from the color of the cartridge base.

(5) In the recording medium cartridge according to the fifth aspect, since the color of the uppermost engraved layer is the same as the color of the base material of the cartridge, the presence of the engraved layer does not give a sense of incongruity to the cartridge.

(6) In the recording medium cartridge of the sixth aspect, the base material of the cartridge can be protected by the engraved layer in which the inorganic aggregate (filler) is mixed. Therefore, it is possible to ensure a large laser output adjustment allowable width, and it is possible to obtain a stable printing effect.

(7) In the recording medium cartridge according to the sixth aspect, since the engraved layer is provided on the edge of the cartridge, the operation when the customer selects the desired recording medium cartridge becomes easy.

[Brief description of the drawings]

FIG. 1 is an exemplary perspective view of a disk cartridge according to a first embodiment as viewed from a front surface side;

FIG. 2 is a perspective view of the disk cartridge according to the first embodiment as viewed from the back side.

FIG. 3 is an exploded perspective view of the disk cartridge according to the first embodiment.

FIG. 4 is an enlarged perspective view of a rear portion of the disk cartridge.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is an explanatory diagram showing a state where printing is performed using a carbon dioxide laser marker.

FIG. 7 is a perspective view showing a state where printing is performed on a printing layer.

FIG. 8 is a sectional view taken along line BB of FIG. 7;

FIG. 9 is a perspective view of a main part of the second embodiment.

FIG. 10 is a sectional view taken along the line CC in FIG. 9;

FIG. 11 is a perspective view of a conventional disk cartridge viewed from the front side.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recording medium cartridge, 2 ... Upper half, 3 ... Lower half, 5 ... Cartridge, 6 ... Magneto-optical disk, 41 ...
Engraved layer (first engraved layer), 42... First engraved layer, 51.
Letters and numbers.

Claims (7)

[Claims] 1. A recording medium cartridge, wherein a marking layer of synthetic resin ink for marking with a laser marker is provided on a part of the cartridge containing the recording medium. 2. The recording medium cartridge according to claim 1, wherein the engraved layer is engraved with a carbon dioxide laser marker and has a thickness penetrating toward the cartridge base. 3. The recording medium cartridge according to claim 1, wherein the engraved layer is colored in a color different from that of the cartridge base. 4. The recording medium cartridge according to claim 1, wherein the marking layer is formed by laminating a plurality of layers colored in different colors. 5. The recording medium cartridge according to claim 4, wherein an uppermost marking layer of the plurality of marking layers is colored in the same color as the base material of the cartridge. 6. The stamp according to claim 4, wherein one of the plurality of stamping layers, excluding the uppermost stamping layer, contains an inorganic bone agent. Recording medium cartridge. 7. The recording medium cartridge according to claim 1, wherein the marking layer is provided on an edge surface of the cartridge.