JPH03290814A - Data cassette - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a data cassette, and more specifically,
The present invention relates to a data cassette in which a magnetic tape with a magnetic head cleaning tape bonded to the end thereof is installed, and foreign matter adhering to the magnetic head during recording and reproduction is removed by the magnetic head cleaning tape at the end of the magnetic tape.

[Conventional technology]

In general, a data cassette has a pair of hubs rotatably arranged inside the main body case, a magnetic tape with a leader tape attached to each hub is wound around the hub, and a guide roll is placed in an appropriate position to guide the running direction of the magnetic tape. It is at the bottom of the tank.

[Problem to be solved by the invention]

However, the magnetic tape installed in conventional data cassettes uses a polyester film with a rough surface or only has one tape attached to the terminal, and this leader tape does not have the magnetic head cleaning effect. During repeated use of this type of data cassette in a fixed head drive, the magnetic layer of the magnetic tape is scraped by the magnetic head, and the back coat layer is scraped by the guide member, generating abrasion powder. If this abrasion powder adheres to the magnetic head, it cannot be removed from the magnetic head, and the error rate worsens due to the abrasion powder attached to the magnetic head, deteriorating the 11m conversion characteristics. , the surface of the magnetic layer may be damaged. In particular, 1.2 m
In data cassettes that are run at high speeds of 7 seconds or more, if abrasion powder or the like adheres to the magnetic head, the error rate deteriorates significantly, the electromagnetic conversion characteristics deteriorate, and the surface of the magnetic layer is easily damaged.

[Means to solve the problem]

This invention has been made as a result of various studies in view of the current situation, and a cleaning tape for a magnetic head, which has an abrasive layer containing abrasive particles on the base, is bonded to the end of a magnetic tape instead of a rubber tape. Alternatively, a leader tape is further bonded to the terminal of the magnetic head cleaning tape bonded to the magnetic tape terminal, and the magnetic tape with these magnetic head cleaning tapes bonded is placed inside the main case of the data cassette. By this,
The magnetic head is cleaned at the beginning and end of the recording/reproducing operation to prevent abrasion powder from the magnetic layer or bank coat layer from adhering to the magnetic head during recording/reproducing operation, thereby reducing the error rate. It has good electromagnetic conversion characteristics and prevents the surface of the magnetic layer from being damaged.

The present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway plan view of a computer data cassette, and as shown in FIG.
, lb are connected with screws 2 in a lid-like manner, and a transparent window 3 is provided in the center, and drive shaft insertion holes 4 are provided on the left and right sides.

A pair of left and right hubs 6.6 with magnetic tape 5 wrapped around each insertion hole 4.4 are rotatably mounted inside the main body case 1, and these hubs 6.6 are rotatably mounted on both sides of the front part of the main body case 1. A guide roll 7.7 is attached to guide the running of the magnetic tape 5 wound around the hub 6.6.

Here, the magnetic tape 5 wound around a pair of left and right hubs 6°6 within the main body case l is provided with a magnetic layer 52 on a base 51 such as a polyester film as shown in FIG. A back coat layer 53 is provided on the lower surface, and a magnetic head cleaning tape 8 is bonded to the end with a sublining tape 9. This magnetic head cleaning tape 8 has a polishing layer 82 containing abrasive particles on a base 81 such as a polyester film.
is formed.

Therefore, when a data cassette containing a magnetic tape 5 with such a magnetic head cleaning tape 8 bonded to its terminal end is used for recording and reproducing by running the magnetic tape 5, the magnetic head is exposed to the magnetic head at the beginning and end. The magnetic head is cleaned using the magnetic head cleaning tape 8, and even if abrasion powder from the magnetic layer and back coat layer of the magnetic tape adheres to the magnetic head, this magnetic head cleaning tape 8 removes it. Therefore, the jl! of the magnetic layer, back coat layer, etc. on the magnetic head. Highly durable data packets can be obtained without aggravating the error rate due to adhesion of wear particles, degrading the electromagnetic conversion characteristics, or damaging the surface of the magnetic layer.

In addition, as shown in FIG.
In this case, the magnetic tape 5 is run to perform recording and reproduction, as in the case where the magnetic head cleaning tape 8 is joined to the end of the magnetic tape 5. During this process, the magnetic head is cleaned with the magnetic head cleaning tape 8 at the beginning and end, removing abrasion powder from the magnetic layer, back coat layer, etc. that has adhered to the magnetic head, and reducing the error rate. This prevents deterioration of the magnetic properties and electromagnetic conversion characteristics, and prevents the surface of the magnetic layer from being damaged.

The magnetic head cleaning tape 8 is formed by mixing and dispersing abrasive particles with a binder resin, an organic solvent, and other necessary components to prepare an abrasive paint, and applying this onto a substrate 81 such as a polyester base film. Then, the polishing layer 82 is formed by coating and drying. The surface roughness of the abrasive layer 82 of the magnetic head cleaning tape 8 formed in this way is such that it is possible to effectively remove deposits such as abrasion powder from the magnetic layer and bank coat layer adhering to the magnetic head. , 0.01 to 0.10 μm
It is preferably within the range of 0.03 to 0.07 μm
It is more preferable to keep it within the range of .

As the abrasive particles used in the abrasive layer of such a magnetic head cleaning tape 8, for example, a-A1.
0. Powder, 5ift powder, Cr.

Any of those conventionally used as abrasive particles such as 03 powder and TiC powder are preferably used. The amount used is preferably within the range of 30 to 70% by weight based on the total solid components contained in the polishing layer.
It is more preferable to use it within the range of 40 to 60% by weight.

In addition, binder resins include vinyl chloride-vinyl acetate copolymers, textile resins, butyral resins, polyurethane resins, polyester resins, incyanate compounds, and other binders commonly used in cleaning tapes. Any resin is suitably used.

The polishing layer contains various commonly used additives,
For example, a lubricant, a dispersant, an antistatic agent, etc. may be added as appropriate.

〔Example〕

Next, embodiments of the invention will be described.

Example 1 Co-containing r-Fez03 powder 72 parts by weight VAGH
(Manufactured by U, C, C, USA, salt 10 vinylide-vinyl acetate-vinyl alcohol copolymer) Parabrane 25S (manufactured by Nippon Polyurethane 16 Rethan Co., Ltd.,
Thermoplastic urethane) Fatty acid ester 2 Coronate L
(Trifunctional low molecular weight isocyanate compound manufactured by Nippon Polyurethane Industry Co., Ltd.) Toluene 62 Cyclohexanone 62 These compositions were mixed and dispersed in a ball mill for 62 hours to prepare a magnetic paint. This magnetic paint was applied onto a polyester base film having a thickness of 17 μm to a dry thickness of 2.7 μm, and dried to form a magnetic layer, which was then mirror-finished.

Next, the following back coat layer paint was applied to the lower surface of the polyester base film on which the magnetic layer was formed until the dry thickness was 1.
．． It was coated to a thickness of 3 μm and dried to form a back coat layer. After that, the magnetic tape 5 is cut into a predetermined width.
I made it.

Back coat layer paint carbon black 45 parts by weight (average particle size 0.017 μm) α-Fe, O, powder 5 (average particle size 0.10 μm) Seltsuba BYH-1 (manufactured by Asahi Kaisha 25, cellulose-based) Resin) N-2309 (manufactured by Nippon Polyurethane Industry Co., Ltd.,
Polyurethane resin) Coronate L 7 Toluene 115 Cyclohexanone
115 On the other hand, 48 parts by weight of α-A1.03 powder (particle size 0
．． 20 μm) VAGH25〃 T-5250 (Dainippon Ink Kagaku 18〃Gakukogyo Co., Ltd., urethane elastomer) Coronate L 7〃Carbon black o, 5〃Stearic acid-n-
Butyl 0.5 myristic acid
l Cyclohexanone 501
Methyl ethyl ketone 20〃Toluene
5o〃 composition in a ball mill 6
A polishing paint was prepared by mixing and dispersing for 2 hours, and this was mixed and dispersed for 2 hours.
The polishing layer was coated on a thick polyester film to a dry thickness of 2.7 μm and dried to form a polishing layer. After that,
Cut the magnetic head cleaning tape 8 to the specified width.
I made it.

Next, as shown in FIG. 2, the magnetic head cleaning tape 8 obtained as described above was bonded to the end of the magnetic tape 5 obtained as described above using a subilizing tape 9.

Then, as shown in FIG. 1, it was wound around a hub 6.6 and placed inside the main body case 1 to create a computer data cassette.

Example 2 In Example 1, a leader tape 10 was further bonded to the end of the magnetic head cleaning tape 8 connected to the end of the magnetic tape 5 with a sublining tape 9, as shown in FIG.

Then, as shown in FIG. 1, it was wound around a hub 6.6 and placed inside the main body case 1 to create a computer data cassette.

Comparative Example 1 In Example 2, magnetic head cleaning tape 8
omitting the splicing of υ~databe1 directly to the end of the magnetic tape
A computer data cassette was produced in the same manner as in Example 2, except that 0 was joined.

The computer data cassettes obtained in each Example and Comparative Example were used repeatedly, and the number of running passes until dropout started to increase was measured under a temperature cycle environment of 2 to 48°C.

Table 1 below shows the results.

Table 1 [Effects of the Invention] As is clear from Table 1 above, the computer data cassettes (Examples 1 and 2) obtained by the present invention are as follows:
Compared to the conventional computer data cassette (Comparative Example 1), the number of bus trips is much greater, and therefore, the data cassette obtained by this invention can effectively remove deposits such as abrasion particles attached to the magnetic head. It can be seen that the error rate is small, the electromagnetic conversion characteristics are good, the surface of the magnetic layer is not damaged, and the durability is excellent.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing an example of a data cassette for a computer according to the present invention, FIG. FIG. 2 is an enlarged partially cutaway sectional view showing another example of the same magnetic tape. DESCRIPTION OF SYMBOLS 1... Main body case, 5... Magnetic tape, 8... Cleaning tape for magnetic head, 81... Base, 82
... Polishing layer, 10... Leader tape

Claims (1)

[Scope of Claims] 1. A data cassette 2 in which a magnetic tape having a magnetic head cleaning tape bonded to a terminal thereof and having an abrasive layer containing abrasive particles on the base is housed in the main body case of the data cassette; 2. The data cassette according to claim 1, wherein a leader tape is further bonded to a magnetic head cleaning tape bonded to an end of the magnetic tape.