JP2003196629A - Memory card base material with pattern - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a memory card base material with a pattern capable of enhancing adhesion of a print layer without lowering productivity. <P>SOLUTION: At least, one surface of the memory card base material 1 is provided with a print surface 2 of a surface roughness of 2-20 μm. The print layer 3 is directly formed on the print surface 2 and the pattern is formed of the print layer 3. The print layer 3 is directly printed and formed on the print surface 2, so that the adhesion between the print layer 3 and the print surface 2 can be enhanced by the increase in the contact area between the print layer 3 and the print surface 2 and an anchor effect. This constitution can dispense with a resin material coating, drying, and hardening processes for forming an undercoat layer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory card substrate for mounting an IC memory such as a flash memory to form a memory card, and a pattern-printed memory card substrate having a pattern printed on its surface. It concerns materials.

[0002]

2. Description of the Related Art Conventionally, as a storage medium for games, music, etc., for storing various electronic data such as image data such as moving images and still images and music data,
Compact memory cards such as Compact Flash (registered trademark) and smart media are used. Recently, patterns (letters, numbers, patterns, etc.) are printed on the surface of the memory card base material in order to identify the stored contents of the memory card, improve the design of the memory card, or display advertisements. (Including) is being done. For example, Japanese Patent Laid-Open No. 2001-312708 discloses a transparent plastic memory card base material on which an IC memory is mounted, at least one surface of which is printed so that a printed pattern can be visually recognized from the opposite side of the printed surface. Is disclosed. Then, in order to improve the adhesion of the printing layer (printing ink layer) on the printing surface of the memory card base material, a transparent undercoat layer is formed with an ultraviolet curable resin or a thermosetting resin, The above printing is applied to the surface of the undercoat layer to form a printing layer.

[0003]

However, in the above-mentioned memory card substrate, since the undercoat layer is provided to improve the adhesiveness of the printing layer, the application of the resin material for forming the undercoat layer is performed.・ Drying / curing process is required, resulting in low productivity.

The present invention has been made in view of the above points, and an object thereof is to provide a base material for a memory card with a pattern, which can enhance the adhesiveness of a printing layer without lowering the productivity. To do.

[0005]

A base material for a memory card with a pattern according to claim 1 of the present invention is a base material for a memory card 1.
Printing surface 2 having a surface roughness of 2 to 20 μm on at least one side of
Is provided, the printing layer 3 is directly formed on the printing surface 2, and a pattern is formed by the printing layer 3.

In addition to the claim 1, the pattern-added memory card base material according to claim 2 of the present invention has a pattern of the printing layer 3 formed on the one printing surface 2 of the memory card base material 1. It is characterized in that it is visible from the other side of the memory card substrate 1.

The base material for a memory card with a pattern according to a third aspect of the present invention is characterized in that, in addition to the first or second aspect, the printing layer 3 is formed by offset printing.

Further, the pattern-added memory card base material according to claim 4 of the present invention is characterized in that, in addition to any one of claims 1 to 3, the thickness of the printing layer 3 is 2 to 15 μm. It is a thing.

Further, in addition to any one of the first to fourth aspects, the base material for a memory card with a pattern according to a fifth aspect of the present invention has an underlayer 4 formed on the surface of the printing layer 3, and the underlayer 4 is formed. Another printing layer 5 is printed on the surface of the.

Further, in the base material for a memory card with a pattern according to a sixth aspect of the present invention, in addition to the fifth aspect, the underlayer 4 has a light transmittance of 20% or less. .

In addition to the pattern-added memory card base material according to claim 7 of the present invention, in addition to any one of claims 1 to 6, a transparent protective coating layer 6 having a pencil hardness of HB or more is used for printing layer 3 ( Alternatively, it is formed on the surface of 5).

The base material for a memory card with a pattern according to an eighth aspect of the present invention is the same as in any one of the first to seventh aspects, and only the surface of the printing layer 3 (or 5) or the printing layer 3 is present.
(Or 5) is formed, and a protective coat layer 6 is formed on the entire one surface of the substrate 1 for a memory card.

Further, in the base material for a memory card with a pattern according to claim 9 of the present invention, in addition to claim 7 or 8, the protective coat layer 6 has a thickness of 1 to 10 μm and a surface glossiness of 65%.
The above is a feature.

A memory card base with a pattern according to a tenth aspect of the present invention is characterized in that, in addition to any of the fifth to ninth aspects, the underlayer 4 is formed by printing. Is.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

An example of the memory card substrate 1 is shown in FIGS. The memory card base material 1 is formed in a thin plate shape, and a recess 10 for mounting an IC memory is provided on one surface 11 of the memory card base material 1. The memory card substrate 1 can be molded by a molding method such as injection molding using a substantially transparent synthetic resin material such as polycarbonate, polyester, polyolefin or polystyrene. At this time, it is also possible to make it colored and transparent by, for example, mixing a pigment within a range that does not impair the transparency.

In the memory card substrate 1 as described above, the printing surface 2 for forming the printing layer 3 is the one surface 11 with the recess 10 open or the one surface 12 without the recess 10. It may be provided on either side or one side
The printing surface 2 may be provided on each of 1 and 12. Also,
The entire surface of the one surface 11, 12 may be formed as the printing surface 2, or a part of the one surface 11, 12 may be formed as the printing surface 2. In the structure shown in FIG. 2, the entire one surface 12 on which the recess 10 is not opened is formed as the printing surface 2. The surface roughness of the printing surface 2 is 2 to 20 μm. In forming the surface roughness of the printing surface 2 to 2 to 20 μm, a method of subjecting the molded memory card base material 1 to physical treatment such as sandblasting or chemical treatment such as etching, or a memory card base material Surface of the cavity and core (molding surface) in the mold when molding 1
To the above surface roughness, and by molding the memory card substrate 1 using this mold, the surface roughness of the cavity or core is transferred to the printing surface 2 of the memory card substrate 1, A method of forming the printing surface 2 of the memory card substrate 1 with the above-described surface roughness at the same time as molding can be adopted, but in order to suppress an increase in the number of steps, the memory card substrate 1 at the same time as molding. It is preferable to employ the method of forming the printing surface 2 of No. 1 to have the above surface roughness. The surface roughness of the printing surface 2 is defined in accordance with JIS B0601.
The surface roughness is measured by a stylus-type surface roughness measuring instrument according to 0651.

As the ink for forming the printing layer 3, an ultraviolet curable ink or a thermosetting ink which has been conventionally used for printing of this kind can be used.
It is possible to use an ink mixed in the range of 40% by mass, 30 to 60% by mass of photosensitive resin, 20 to 40% by mass of photosensitive monomer, and 5 to 10% by mass of photoinitiator.

When forming the memory card substrate 1 with a pattern of the present invention, the printing layer 3 is directly formed on the printing surface 2 of the memory card substrate 1 and the printing layer 3 is formed.
To form a pattern (including letters, numbers, patterns, etc.). As shown in FIG. 1, the printing layer 3 is formed by printing a plurality of inks 3a to 3d having different color types in a layered manner, and the ink 3a printed on the lowermost layer is the printing surface 2 It is printed in direct contact with.
When forming the printing layer 3 by printing, various printing methods such as offset printing, silk screen printing, and gravure roll printing can be adopted, but in order to form a clearer printing layer 3, offset printing is possible. Is preferably adopted.

In the present invention, the printing surface 2 can be made into a fine uneven surface by forming the surface roughness of the printing surface 2 to 2 to 20 μm, and the printing layer 3 is directly printed on the printing surface 2. By forming the printing layer 3 and the printing surface 2
The adhesiveness between the printing layer 3 and the printing surface 2 can be increased by increasing the contact area of the printing layer 3 and the anchor effect, and the printing layer 3 can be formed by forming the surface roughness of the printing surface 2 to 2 to 20 μm. Since the adhesion between the printed surface 2 and
The conventional coating / drying / curing process of the resin material for forming the undercoat layer is unnecessary, and the productivity can be prevented from decreasing. If the surface roughness of the printing surface 2 deviates from the above range, the adhesion between the printing layer 3 and the printing surface 2 may be reduced. Furthermore, in the present invention, by forming the memory card substrate 1 transparent,
The pattern of the printing layer 3 formed on the printing surface 2 of the one surface 12 is formed so as to be visible from the other one surface 11 side on the opposite side through the memory card base material 1. Even when the printing layer 3 is not formed only on the one surface 12 (or 11), the pattern can be visually recognized from the other one surface 11 (or 12), and a high display effect can be obtained with a small number of printing steps. . In the present invention, the printing surface 2 may be provided on each of the single surfaces 11 and 12, and the printing layer 3 may be directly formed on both printing surfaces 2.

The thickness of the printing layer 3 is preferably 2 to 15 μm. If the thickness of the printing layer 3 is less than 2 μm, the strength of the printing layer 3 may be low and chips or cracks may occur to damage the design. If the thickness of the printing layer 3 exceeds 15 μm, the printing layer 3 may be damaged. Since it is soft, it may be easily scratched.

A protective coat layer 6 is preferably provided on the surface of the printing layer 3 in order to protect the surface of the printing layer 3 from friction and the like. The protective coat layer 6 may be provided only on the surface of the printing layer 3, or may be provided on the entire one surface 12 of the memory card substrate 1 on which the printing layer 3 is formed. When the protective coating layer 6 is provided on the entire surface of the substrate, not only the printing layer 3 but also the one surface 1 of the memory card substrate 1
2 can also be protected. In addition, the protective coat layer 6 is preferably substantially transparent so that the shape and color of the printed layer 3 can be seen through, and the protective coat layer 6 has a pencil hardness of HB or more so as to reduce abrasion. Is preferred. The higher the pencil hardness of the protective coat layer 6 is, the more preferable it is. Therefore, the upper limit is not particularly set, but it is preferable that the pencil hardness is 7H or less in view of availability and formation.

The protective coat layer 6 has a thickness of 1 to 10 μm.
It is preferably m. The thickness of the protective coat layer 6 is 1μ
If the thickness is less than m, the strength of the protective coat layer 6 may be low to cause chipping or cracking, resulting in breakage. If the thickness of the protective coat layer 6 exceeds 10 μm, the glossiness may be reduced or the transparency may be impaired. There is a possibility that the problem will occur. Also,
The protective coating layer 6 preferably has a surface gloss of 65% or more. If the glossiness of the surface of the protective coat layer 6 is less than 65%, there is a possibility that the visibility of the pattern formed by the print layer 3 may be deteriorated. The higher the glossiness of the surface of the protective coat layer 6, the more preferable.
Although the upper limit is not set, it is preferable that the glossiness of the surface of the protective coat layer 6 is 95% or less in view of easy availability and formation.

Such a protective coat layer 6 can be formed by using a known ultraviolet curable resin. The protective coat layer 6 can be formed by spin coating, silk screen printing, offset printing, or the like.

FIG. 3 shows another embodiment. The base material for a memory card with a pattern uses the same printing layer 3 as the first printing layer as described above, and the second printing layer 5 is formed on the surface of the first printing layer 3 via the underlayer 4. The same protective coat layer 6 as described above is formed on the surface of the second printed layer 5. Other configurations are similar to those of the above-described embodiment. And
This memory card base with a pattern is such that another pattern is formed on the surface of the pattern of the first print layer 3 by the second print layer 5.

The underlayer 4 secures the adhesiveness between the first printing layer 3 and the second printing layer 5 and is such that the color of the first printing layer 3 does not show through the second printing layer 5. It has a concealing property and can be formed by using a known ultraviolet curable resin. In addition, the underlayer 4 preferably has a light transmittance of 20% or less. When the light transmittance of the base layer 4 is larger than 20%, the color of the first printing layer 3 is changed to the second printing layer 5.
There is a possibility that it may be seen through the screen, and the appearance of the memory card base with a pattern may deteriorate. Since the light transmittance of the underlayer 4 is preferably low, the lower limit is 0% (light is not transmitted). Further, the base layer 4 is the first print layer 3
Similarly to the above, it can be formed by printing such as offset printing. Further, the second printing layer 5 is formed by stacking a plurality of inks 5a to 5d having different color types in a layered manner and printing the same as the first printing layer 3, and the second printing layer 5 is printed in the lowest layer. The ink 5a to be applied is the surface (upper surface) of the underlayer 4.
It is printed in direct contact with. Further, the second printing layer 5 can be formed by various printing methods such as offset printing similar to the first printing layer 3.

In addition, in this embodiment, since the pattern is formed not only by the first printing layer 3 but also by the second printing layer 5, a variety of patterns can be obtained as compared with the case where the pattern is formed only by the first printing layer 3. It can be formed and the designability can be improved.

[0028]

EXAMPLES The present invention will be specifically described below with reference to examples.

(Example 1) Transparent memory card substrate 1
A polycarbonate skeleton base material for smart media was used as. This memory card substrate 1 is a recess 1
The entire surface of the one side 12 where 0 is not opened is formed as the printing surface 2, and the surface roughness of this one side 12 is 2 μm.
Is formed in.

The printing surface 2 of the base material 1 for the memory card
UV curable 4-color ink (Dainippon Ink's "Die Cure Process Ink RT-V Series",
A printing layer 3 having a thickness of 5 μm was formed by offset printing using the colors of the inks 3a to 3d of yellow, red, indigo, and black), and a pattern was formed by the printing layer 3. The pattern of the print layer 3 was visible from the other surface (one surface other than the print surface 2) 11 of the memory card substrate 1. After that, a protective coating layer 6 having a thickness of 2 μm was formed on the surface of the printing layer 3 by offset printing using an ultraviolet curable resin (“New Dicure GPOP Varnish RC” manufactured by Dainippon Ink).

In the base material for a memory card with a pattern thus formed, the maximum surface roughness Rmax of the protective coat layer 6 was 1.5 μm, the surface glossiness was 70%, and the pencil hardness was 3H. The print layer 3 is JIS Z 0237.
Passed the peel test.

(Example 2) A memory card base material with a pattern was prepared in the same manner as in Example 1 except that the printed surface 2 having a surface roughness of 20 μm was used as the memory card base material 1. Formed. In this patterned memory card substrate, the protective coat layer 6 had a maximum surface roughness Rmax of 1.9 μm, a surface gloss of 68%, and a pencil hardness of 2H. The printed layer 3 passed the JIS peel test similar to the above (Example 3). The first printed layer 3 was formed on the printed surface 2 of the memory card substrate 1 in the same manner as in Example 1. After printing layer 3
A base layer 4 having a thickness of 5 μm was formed on the surface of. The base layer 4 was formed by printing an ultraviolet curable resin (product number “Best Cure STP White W-3” manufactured by “T & K TOKA”) by offset printing. The light transmittance of the underlayer 4 was 16%.

After that, the second printing layer 5 is formed on the surface of the underlayer 4.
Was formed, and a pattern was formed on both the first printed layer 3 and the second printed layer 5. This pattern was visible from the other surface (one surface other than the printing surface 2) 11 of the memory card substrate 1. The inks 5a to 5d of the second printing layer 5 are the same as the inks 3a to 3d of the first printing layer 3, and
The printing layer 5 of No. 1 was formed by offset printing similarly to the first printing layer 3.

After forming the second printed layer 5, a protective coat layer 6 was formed on the surface of the second printed layer 5. The protective coat layer 6 was formed in the same manner as in Example 1.

In the thus formed base material for memory card with pattern, the maximum surface roughness Rmax of the protective coat layer 6 was 1.5 μm, the surface glossiness was 70%, and the pencil hardness was 4H. The first printed layer 3 and the second printed layer 5 passed the JIS peel test similar to the above.

Comparative Example A skeleton smart media substrate made of polycarbonate was used as the transparent memory card substrate 1. This memory card substrate 1 has a recess 10
The entire surface of one side 12 on which one side is not opened is formed as the printing surface 2, and the surface roughness of this one side 12 is 0.1 μm.
It is formed in m.

An undercoat layer having a thickness of 4 μm was formed on the printing surface 2 of the memory card substrate 1. The undercoat layer is an ultraviolet curable resin (“T & K TOKA”)
It was formed by applying a product number “Best Cure SA Medium”) and then drying and curing it. Then, the printed layer 3 and the protective coat layer 6 were formed on the surface of the undercoat layer in the same manner as in Example 1.

In the memory card substrate with a pattern thus formed, the protective coat layer 6 had a maximum surface roughness Rmax of 1.7 μm, a surface gloss of 73% and a pencil hardness of 2H. In addition, the printing layer 3 is the same JIS as above.
Passed the peel test. However, the step of forming the undercoat layer was required, and the productivity was lower than in Examples 1 to 3.

[0039]

As described above, according to the invention of claim 1 of the present invention, a printing surface having a surface roughness of 2 to 20 μm is provided on at least one surface of a memory card substrate, and a printing layer is directly formed on the printing surface. Since the pattern is formed by the printing layer, the printing layer is printed directly on the printing surface to increase the contact area between the printing layer and the printing surface, and the adhesion effect increases the adhesion between the printing layer and the printing surface. Therefore, it is possible to prevent the productivity from being lowered because the resin material coating / drying / curing step for forming the undercoat layer is unnecessary.

According to the second aspect of the present invention, since the design of the printing layer formed on the one printing surface of the memory card substrate is visible from the other one side of the memory card substrate, Even when the layer is not formed, the pattern can be visually recognized from the other side, and a high display effect can be obtained with a small number of printing steps.

Further, in the invention of claim 3 of the present invention, since the printing layer is formed by offset printing, it is possible to form a clearer printing layer as compared with other printing methods and improve the appearance. Is something that can be done.

Further, in the invention of claim 4 of the present invention, since the thickness of the printing layer is set to 2 to 15 μm, the visibility of the pattern formed by the printing layer is good and cracks and chips are less likely to occur. .

Further, in the invention of claim 5 of the present invention, since the base layer is formed on the surface of the print layer and another print layer is printed on the surface of the base layer, the pattern is formed by only one print layer. More diverse patterns can be formed, and the design can be improved.

Further, in the invention of claim 6 of the present invention, since the light transmittance of the underlayer is 20% or less, the color of the print layer is less likely to be seen through the other print layers and the appearance is reduced. It is something that can be prevented from falling.

Further, in the invention of claim 7 of the present invention, since a transparent protective coat layer having a pencil hardness of HB or more is formed on the surface of the printing layer, abrasion of the protective coat layer can be reduced and the printing layer can be formed. It can be sufficiently protected.

Further, in the invention of claim 8 of the present invention, since the protective coating layer is formed only on the surface of the printing layer or on one entire surface of the memory card substrate on which the printing layer is formed, the printing layer and the printing layer are formed. The entire surface of one side of the base material for a memory card can be protected by the protective coat layer, and damage of the printing layer and the like can be prevented by the protective coat layer to prevent deterioration of appearance.

Further, in the invention of claim 9 of the present invention, since the protective coat layer has a thickness of 1 to 10 μm and the surface glossiness is 65% or more, the visibility of the pattern formed by the printing layer is enhanced. Is something that can be done.

Further, in the invention of claim 10 of the present invention, since the base layer is formed by printing, the base layer can be formed in the same step as that of printing the print layer as a design, and the production efficiency is improved. It can be improved.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an example of an embodiment of the present invention.

2A and 2B show the same memory card substrate as above, wherein FIG. 2A is a rear view, FIG. 2B is a sectional view, and FIG.

FIG. 3 is a partial cross-sectional view showing an example of another embodiment of the above.

[Explanation of symbols]

1 Base materials for memory cards 2 Printing side 3 printing layers 4 Underlayer 5 printing layers 6 Protective coating layer

   ─────────────────────────────────────────────────── ─── Continued front page    (71) Applicant 593001808             NP Tsukuba Co., Ltd.             6136-4 Nakamaru, Osaigo-cho, Mizukaido City, Ibaraki Prefecture (72) Inventor Takefumi Mizushima             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Masamichi Nakayama             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Yoshinori Toyota             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Hiroshi Iwasaki             1-1-1 Shibaura, Minato-ku, Tokyo Co., Ltd.             Inside Toshiba (72) Inventor Fumio Kurokawa             2-7-9 Mita, Minato-ku, Tokyo Co., Ltd.             In bit stream (72) Inventor Tatsuo Sugawara             6136-4 Nakamaru, Osaigo-cho, Mizukaido City, Ibaraki Prefecture             N.P. Tsukuba Co., Ltd. F-term (reference) 2C005 MA12 MB03 PA15 PA21 RA10                       RA11                 4F100 AK45 AR00C AR00E AT00A                       BA02 BA04 BA05 BA07 BA10D                       BA10E GB71 HB31B HB31D                       JK12E JK14A JL11 JN01E                       JN02C JN21E YY00A YY00B                       YY00E                 5B035 AA00 BA05 BB09 BC00 CA01

Claims (10)

[Claims] 1. A printing surface having a surface roughness of 2 to 20 μm is provided on at least one surface of a memory card substrate, a printing layer is directly formed on the printing surface, and a pattern is formed by the printing layer. A base material for memory cards with patterns. 2. The pattern according to claim 1, wherein the pattern of the print layer formed on the printing surface on one side of the memory card base is visible from the other side of the memory card base. Base material for memory cards. 3. The base material for a memory card with a pattern according to claim 1, wherein the print layer is formed by offset printing. 4. The base material for a memory card with a pattern according to claim 1, wherein the printed layer has a thickness of 2 to 15 μm. 5. The memory card with a pattern according to claim 1, wherein a base layer is formed on the surface of the print layer, and another print layer is formed on the surface of the base layer. Substrate. 6. The base material for a memory card with a pattern according to claim 5, wherein the underlayer has a light transmittance of 20% or less. 7. The base material for a memory card with a pattern according to claim 1, wherein a transparent protective coat layer having a pencil hardness of HB or more is formed on the surface of the printing layer. 8. The pattern according to claim 1, wherein a protective coat layer is formed only on the surface of the print layer or on one side of the memory card substrate on which the print layer is formed. Base material for memory card with. 9. The base material for a memory card with a pattern according to claim 7, wherein the protective coat layer has a thickness of 1 to 10 μm and a surface glossiness of 65% or more. 10. The base material for a memory card with a pattern according to claim 5, wherein the underlayer is formed by printing.