JPH04268273A - Tape guide block of magnetic tape 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]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape guide block for a magnetic tape cassette used for analog recording and digital recording.

0002

[Prior Art] Conventionally, as described in Japanese Unexamined Patent Publication No. 59-124072, an attempt has been made to improve the perpendicularity, frictional characteristics, rigidity, etc. of the guide portion by forming a tape guide block from a ceramic material. was known. Alternatively, as described in Japanese Patent Application Laid-Open No. 59-124073, an attempt was made to improve the perpendicularity and abrasion resistance of the tape guide section by forming the tape guide block from a composite material of ceramic material and synthetic resin. was known.

0003

[Problems to be Solved by the Invention] However, each of these conventional techniques has major problems as described below, which pose problems in practical or industrial production. First, the method described in JP-A-59-124072 forms the guide block using fine ceramics, which requires complex processes such as sintering, which makes the processing itself time-consuming and ultimately very expensive. It has the problem that it sticks.

[0004] Next, the method described in Japanese Patent Application Laid-Open No. 124073/1980 involves mixing ceramic powder with resin and forming a guide block by, for example, injection molding the mixture. However, in this case, for example, Si
Ceramic powders such as C and Al2O3 tend to fall off from resin molded products, which causes wear and tear when used for long periods of time, resulting in deterioration of sound quality in the case of analog recording such as music, and worsening of the data error rate in the case of digital recording such as computer data. It has the problem of inviting people.

[0005] Therefore, the present invention sometimes improves wear resistance, perpendicularity,
An object of the present invention is to provide a highly reliable and long-life magnetic tape cassette at a low cost by providing a method for industrially manufacturing a highly heat-resistant tape guide block at a very low cost.

[0006]

[Means for Solving the Problems] The tape guide block of the magnetic tape cassette of the present invention is characterized in that the entire surface or a portion thereof is plated with ceramic composite.

[0007]

[Examples] Examples of the present invention will be described in detail below. FIG. 1 is a partially sectional perspective view showing an embodiment of the present invention, in which a guide block main body 1 is provided with tape guide portions 2a to 2d. In an actual magnetic tape cassette, the back side (non-recording side) of the magnetic tape 3 is connected to the tape guide portions 2a to 2.
The recording/playback or winding is performed while being fed while in contact with d. In recent years, with improvements in tape performance such as recording density and durability, hard resin coatings are increasingly being applied to the back side (non-recording side) of magnetic tape materials such as polyester, and as a result, the amount of wear on the tape guide section has been significantly reduced. There is a tendency for it to get worse. Therefore, the surface of the resin molded product 5 that forms the shape of the guide block body 1 is made of Si.
Composite plating 4 such as C and BN is applied. The resin used for the resin molded product 5 is ABS, PC
, PPE, POM, PA, PBT, or liquid crystal polymer, which are easy to plate and can be molded with high precision in shape and size are desirable. Although ABS, liquid crystal polymer, and PC were used here, other resins can also be used. Composite plating 4 was formed by composite chemical plating in which powder of fine ceramics such as SiC was mixed with an electroless nickel-phosphorus plating solution. The process for forming the composite plating 4 is as follows. First, the surface of the resin molded article 5 is etched with acid or alkali, washed with water, neutralized, and then immersed in a palladium colloidal solution for catalyst treatment. Next, an accelerator treatment is performed using dilute hydrochloric acid or the like to reduce the aforementioned colloid to metallic palladium. When the resin molded article 5 that has undergone the above treatment is placed in a composite electroless plating bath, the metal palladium mentioned above acts as a catalyst and a plating film is easily formed. In addition, before composite plating, normal electroless nickel/phosphorus plating or electroless copper plating is applied.
．． It is possible to improve the yield of composite plating processing by depositing 1 to 0.5 μm. The aforementioned nickel-phosphorus plating is basically non-magnetic, but the residual magnetism changes depending on the phosphorus content. In this case 6~
A phosphorus content of 15% was good. Ordinary nickel plating, nickel/boron plating, or nickel/cobalt/phosphorus plating can also be used, although the residual magnetism will be high. Note that the composite plating 4 can be formed in a similar manner not only by electroless plating but also by ordinary electroplating.

FIG. 2 is a partially enlarged cross-sectional view of the composite plating 4. As shown in FIG. Fine ceramic powder 41 is co-fractionated in the nickel-phosphorus metal part 40, and the surface hardness is that of SiC.
The composite shows a very high value of Hv700 to 800, and the BN composite shows a very high value of about Hv500. Therefore, even if the magnetic tape runs in contact with the tape, the amount of wear is very small.
It was possible to obtain wear resistance equivalent to or higher than that of the method described in JP-A-59-124072.

FIG. 3 is a graph showing the specific wear amount depending on the type of tape guide block. A is when a resin molded article is used, B is when a composite material of ceramic and resin as described in JP-A-59-124073 is used, and C is when JP-A-59-124072 is used. When using a ceramic material as described in the above publication, D indicates the specific wear amount at parts 2a to 2d in FIG. 1 when using the embodiment of the present invention. It is something. The tape guide block according to the present invention has a wear amount of 1
Since the thickness of the composite plating itself is as small as a few microns, the plating time can be completed in a short time of several minutes to several tens of minutes. The method described in the above-mentioned Japanese Patent Application Laid-Open No. 59-124072 requires a very long process of extrusion → primary sintering → cutting → reaction sintering, whereas the method according to the present invention requires a very long process of extrusion → primary sintering → cutting → reaction sintering. It has been found that the manufacturing cost is extremely low because a large amount can be processed in a short time through a simple process of processing and then plating.

0010

[Effects of the Invention] As explained above, the present invention improves the abrasion resistance, perpendicularity, heat resistance, etc. of the tape guide portion by applying ceramic composite plating to the entire surface or a part of the tape guide block surface of the magnetic tape cassette. This has the great effect of making it possible to provide a tape guide block at an extremely low cost without deteriorating the quality. Therefore, it greatly contributes to reducing the cost of highly reliable and long-life magnetic tape cassettes.

[Brief explanation of the drawing]

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

FIG. 2 is a partially enlarged cross-sectional view of one embodiment of the present invention.

FIG. 3 is a graph showing the specific wear amount depending on the type of tape guide block.

[Explanation of symbols]

1 Guide block body 2a-2d Tape guide part 3 Magnetic tape 4 Composite plating 5 Resin molded products 40 Composite plated metal part 41 Fine ceramic powder

Claims (1)

[Claims] 1. A tape guide block for a magnetic tape cassette, characterized in that the entire surface or a portion thereof is plated with ceramic composite.