JP2589016B2 - Flexible board with protective sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible substrate with a protective sheet used for an ink jet printer or the like.

[0002]

2. Description of the Related Art In general, in an ink jet printer, a large number of ink discharge ports 23 are formed on one side of a cartridge type ink container 20 mounted on a printer (not shown), for example, as shown in FIG. Glass substrate (T
AB) 21 is provided, and the signal receiving unit 2 of the glass substrate 21 is provided.
2, a convex electrical contact (convex portion) 3 formed at the end of the conductor circuit of the flexible substrate 2 is always in contact with the flexible substrate 2. A predetermined ink ejection port 23 is
, Ink is ejected from the printer, and characters and the like are drawn on the paper 24.
In FIG. 3, the signal receiving unit 22 of the glass substrate 21 and the electrical contact 3 of the flexible substrate 2 are drawn apart, but in use, the signal receiving unit 22 and the electrical contact 3 connected by a dashed line are used. The three always contact each other.

The flexible substrate 2 used in such a printer is manufactured, for example, as follows.
That is, as shown in FIG.
A copper foil 8 having a thickness of 18 to 140 μm is laminated on an insulating film 7 made of an m plastic film with an adhesive 9, and then the copper foil 8 is patterned to form a conductor circuit. Thereafter, the flexible substrate 2 is punched into a predetermined shape from the insulating film 7 side by using a mold having a convex portion, and at the same time, the convex portion 3 is formed at the end of the conductor circuit by the convex portion of the mold. I do. Then, the surface of the convex portion 3 is subjected to a plating process such as nickel-gold plating, and the convex portion 3 is used as an electrical contact. The height of the projection 3 is usually set to 0.02 to 1.0 mm, and the diameter thereof is usually 0.1 to 1.0 mm.
It is set to ~ 3.0 mm.

[0004]

Since the flexible substrate 2 is packed in multiple layers during transportation, the convex portion 3 of the flexible substrate 2 is placed on the insulating film 7 of the flexible substrate stacked thereabove. Rubs with
The plating surface applied to the surface of the convex portion 3 becomes dirty, and the oligomer (low-molecular substance) 15 deposited from the insulating film 7 adheres to the convex portion 3 (see FIG. 4). For this reason, there is a problem that a contact failure occurs between the electrical contact 3 and the signal receiving unit 22 of the glass substrate 21 so that ink is not discharged from a predetermined ink discharge port 23.

In order to prevent the oligomer 15 from adhering, for example, the convex portion 3 is covered with paper 11 as shown in FIG. 5, or the convex portion 3 is coated with a peel coat 13 as shown in FIG. Or it was covered with.

However, the method using the paper 11 requires an adhesive tape 12 for attaching the paper 11 to the flexible substrate 2.
Must be cut to a predetermined length, which is troublesome. In addition, there is a problem that fiber scraps are generated from the paper 11 itself, and the convex surface 3 and the paper 11 are rubbed against each other due to vibration during transportation, so that the surface of the paper 11 is damaged. In addition, the method of applying the peel coat 13 requires a pretreatment such as masking, which requires time and effort, and has a problem that the peel coat 13 is not peeled off when the peel coat 13 is peeled off later.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to provide a flexible substrate with a protective sheet that allows easy attachment of the protective sheet and that allows the protective sheet to be easily peeled off later. Aim.

[0008]

In order to achieve the above-mentioned object, a flexible substrate with a protective sheet according to the present invention comprises a flexible substrate and a protective sheet with an adhesive stuck to a projection forming region of the substrate. In this configuration, the adhesive force A of the adhesive to the protective sheet, the cohesive force B of the adhesive itself, and the adhesive force C of the adhesive to the flexible substrate are set to satisfy the following relational expression. .
A ≧ B> C ≧ 25 g / cm

[0009]

In other words, the flexible substrate with a protective sheet according to the present invention protects the projections with a protective sheet provided with an adhesive set to the specific adhesive force and cohesive force. Therefore, it is only necessary to attach the protective sheet, and the operation is easy. In addition, since no paper is used, fiber chips are not generated, and the protective sheet adheres to the convex portion via an adhesive, so that the convex portion and the protective sheet are rubbed by vibration during transportation. And the projections are not damaged. Further, the protective sheet is easily peeled from the flexible substrate, and the adhesive does not remain on the flexible substrate even after the peeling.

Next, the present invention will be described in detail based on embodiments.

[0011]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a sectional view of a main part thereof. In these figures, reference numeral 4 denotes a protective sheet with an adhesive, for example, SPV-224 manufactured by Nitto Denko Corporation. It is stuck on the contact 3 forming part. This sticking operation is very easy.

The protective sheet with adhesive 4 has an adhesive force (A) between the protective sheet 5 and the adhesive 6 of 100 to 3.
000 g / cm, preferably 500 to 2 g / cm.
000 g / cm. Further, the cohesive force (B) of the adhesive 6 itself is such that the amount of the adhesive protruding after a load of 0.5 kg / cm ² is left for 60 minutes in a temperature atmosphere of 85 ° C. for a range of 1.0 to 0 mm. The cohesive force is set to be within, and preferably, the cohesive force is set such that the amount of protrusion is 0.2 mm or less. Further, the adhesive force (C) between the flexible substrate 2 and the adhesive 6 is set to 10 g / cm or more, preferably 30 to 100 g / cm. The relationship (A) ≧ (B)> (C) ≧ 25 g / cm is established between the above (A), (B) and (C). If this relationship is not satisfied, the adhesive 6 peels off the protective sheet 5 at the time of peeling, and only the protective sheet 5 peels off, and the adhesive 6 remains on the flexible substrate 2 or the adhesive 6 protrudes from the protective sheet 5. This is because a problem occurs that the protective sheet 5 is displaced and the adhesive 6 is exposed.

Accordingly, the flexible substrate 2 in which the protruding portions 3 are protected by the protective sheet 4 with the adhesive, has a protective sheet 5 in close contact with the protruding portions 3 via the adhesive 6, so that the vibration during transportation is suppressed. According to this, the projection 3 and the protective sheet 4 do not rub against each other, and the plating surface provided on the projection 3 is not damaged. Further, the protection sheet 4 is easily peeled off from the flexible substrate 2, and the adhesive 6 does not remain on the surface of the flexible substrate 2 or the protrusions 3 even after the peeling.

In the above embodiment, the adhesive 6 is adhered to the entire surface of the protective sheet 5. However, the present invention is not limited to this, and the adhesive 6 may be partially adhered to the protective sheet 5. In this case, the protective sheet 4 is easily peeled off at any time.

[0015]

As described above, according to the flexible substrate with a protective sheet of the present invention, the convex portions can be formed simply by sticking the protective sheet provided with the adhesive set to the specific adhesive force and cohesive force. Can be protected, and the sticking operation is easy. In addition, since no paper is used, fiber chips are not generated, and the protective sheet adheres to the convex portion via an adhesive, so that the convex portion and the protective sheet are rubbed by vibration during transportation. And the projections are not damaged. Moreover, the protective sheet is easily peeled off from the flexible substrate, and no adhesive remains on the flexible substrate even after peeling.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part thereof.

FIG. 3 is an explanatory diagram of an ink jet printer.

FIG. 4 is a cross-sectional view showing a state where an oligomer is attached to a flexible substrate.

FIG. 5 is a perspective view showing a conventional example.

FIG. 6 is a perspective view showing another example of the conventional example.

[Explanation of symbols]

 2 Flexible substrate 3 Convex part 4 Protective sheet with adhesive 5 Protective sheet 6 Adhesive

Claims (1)

(57) [Claims] 1. A flexible substrate comprising: a flexible substrate; and a protective sheet with an adhesive attached to a convex portion forming region of the substrate, wherein an adhesive force A of the adhesive to the protective sheet, a cohesive force B of the adhesive itself, A flexible substrate with a protective sheet, wherein an adhesive force C of the adhesive to the flexible substrate is set to satisfy the following relational expression. A ≧ B> C ≧ 25 g / cm