JPS5923012B2 - Manufacturing method of information signal regeneration needle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An information recording medium disk having a recording trace formed by arranging bits corresponding to an information signal in a spiral or concentric pattern enables high density recording of information signals. Recording and reproducing methods include those in which information signals are read from a disk optically, those in which mechanical displacement is detected, and changes in capacitance value. Typical examples include those that are performed by detecting .

Depending on the playback method, the information signal from the disk is read by a reading element that is not in contact with the disk, or by a playback stylus that makes sliding contact with the disk. It is also well known that various different aspects have been adopted, such as .

By the way, in the case where the information signal is read from the disk using a playback needle that comes into sliding contact with the disk, for example, the information signal is read from the disk as follows.
When the regeneration needle is equipped with a piezoelectric detection element, or when the regeneration needle is equipped with an electrode for detecting changes in capacitance, the disc and the regeneration needle are Because of the sliding contact between the playback stylus and the disk, dust and other dust caused by the wear of both the playback stylus and the disk adhere to the playback stylus, thereby degrading the quality of the playback signal.

Further, when the dust adhering to the reproducing needle is carbonized and hardened by the heat generated on the sliding surface, the surface of the disk is damaged by the product. and,
Scratches on the disc surface can be caused by chipping (
However, if a chip occurs at the end of the sliding surface of the playback stylus, the disc surface is damaged, and the damage to the disk surface further damages the playback stylus, which causes the disc to become damaged. The damage to the playback stylus and the disc increases and progresses cyclically, making the degree of damage to the surface even more significant, until both the playback stylus and the disc are damaged to the point where they are unusable. Sometimes things happen. FIG. 1 is a perspective view of an example of a conventional regenerated needle, and the regenerated needle shown in the first figure has an electrode structure in which an electrode portion D for detecting changes in capacitance value is formed on a regenerated needle main body S. This is an example of a structure formed by depositing a thin film of a conductive substance on the surface 5.

The regenerated needle shown in FIG. The bottom surface thereof constitutes a sliding surface A for contacting the disk.
In such a regenerated needle, the sliding contact surface A is of course finished with a mirror finish so that the sliding contact surface A does not damage the disk due to sliding contact between the sliding contact surface A and the disk. Each of the surfaces 1 to 5 adjacent to the contact surface A was also finished to have a mirror surface with a surface roughness of, for example, 0.1 μm or less, but with conventional recycled needles, as described above,
Generation of dust due to wear → adhesion of dust to the main body of the recycled needle and hardening → damage to the disk → chipping of the end of the sliding surface of the recycled needle → generation of dust → Unfavorable phenomenon Therefore, it has been difficult to stably obtain a good reproduced signal over a long period of time.

The present inventors believe that the occurrence of the above-mentioned undesirable phenomenon in the regenerated stylus originates from the dust generated when the disc and the regenerated stylus come into sliding contact, and that the edge of the sliding surface of the regenerated stylus Focusing on the fact that chipping of parts has become an important factor, we investigated conventional regenerated needles and found that sliding contact surface A and each surface adjacent to sliding contact surface A in conventional regenerated needles The line of intersection with 1 to 5, that is, the edge of the sliding surface is not a straight line, as shown in the enlarged perspective view shown in Fig. 2, but a complex curved line, and the protrusion at this edge is regenerated. The pitting and rolling motion of the regenerated needle during operation may pierce the surface of the disk, causing scratches on the disk surface and generating dust, and minute irregularities on the edges tend to attract dust. Conventional recycled needles have a lot of dust attached to them, and conventional recycled needles have a processing strain layer on the surface of the recycled needle due to the polishing process performed on each surface when manufacturing the recycled needle. It has become clear that because of this, chips tend to occur at the edges of the sliding surface. The present invention has been made for the purpose of providing an information signal reproducing needle which can be easily manufactured and which satisfactorily solves the problems of conventional reproducing needles. The contents will be explained in detail.

In the method for manufacturing the information signal reproducing needle of the present invention, at least one surface of a plurality of surfaces adjacent to the sliding contact surface of the regenerating needle body made of a high hardness material having wear resistance is made of the material of the regenerating needle body. It is characterized in that it is formed by sequentially applying a mechanical chemical polysink means and a chemical etching means, thereby making the edges of the sliding surface smooth, and It is therefore possible to easily obtain a regenerated needle in which no processed strain layer exists on the processed surface.

Next, a method of manufacturing the information signal reproducing needle of the present invention will be described by giving an example in which sapphire is used as the material for the reproducing needle body.

When the material of the recycled needle body is sapphire (Al2O3), when the required surface of the recycled needle body is processed and formed by mechanical chemical polysynch, the sapphire of the recycled needle body and the mechanical chemical polysynch Silicon dioxide powder (20% by weight) and water (8% by weight) used
The following chemical reaction occurs with a colloidal solution (0% by weight), but in mechanical chemical polysink, the polysink is performed by a chemical reaction while the products of the chemical reaction are mechanically removed. The machined surface is smoothly polysynced.

(Experimental value of activation energy...14.6
(Kca1/MOl) That is, during the mechanical/chemical polysinking described above, no mechanical crushing phenomenon occurs on the surface of the sapphire, and therefore no scratches occur. In addition, since a colloidal solution of silicon dioxide powder and water is used in mechanical chemical polysinking, the temperature rise on the surface of sapphire during processing is between 60°C and 80°C. It is considered that no polishing was performed.
The mechanical-chemical polysink described above removes the sapphire surface at a rate of approximately 15 μm per hour. And like this, Al2O3/SlO2/
When a surface adjacent to the sliding contact surface of the regenerated needle body S is formed by mechanical/chemical polysync in the H2O system, the formed surface becomes a mirror surface.

The surface of the regenerated needle main body S to be formed by the above-mentioned mechanical chemical polysink may be all or part of the surfaces 1 to 5 of the regenerated needle main body S in FIG. It goes without saying that the best results can be obtained when 1 to 5 inches are formed by mechanical/chemical polysink.

Next, chemical treatment is applied to the surface obtained as described above.
The residual machining strain layer is removed by etching.

In other words, it is well known that processing strain always remains on the surface of processed single crystal sapphire, which deteriorates the single crystal condition of sapphire. The strained layer is extremely susceptible to chipping due to the impact given to the reproducing needle by scratches and dust on the surface of the disk. Therefore, in the method of manufacturing the information signal reproducing needle of the present invention, the processed strain layer is removed by chemical etching, thereby making the completed reproducing needle less likely to chip during the reproducing operation.

Saphire's regenerated needle body uses silicon dioxide powder (2
0% by weight) and water (80% by weight) and heated to 120°C with stirring in a pressure cooker at 5 atm.
After 1 hour of heating, the surface of the sapphire is removed by chemical etching to a thickness of about 3 μm, so that the surface formed by the application of the mechanical chemical polysink method as described above is It is clear that the work-distorted layer in a regenerated needle body comprising a needle body can be successfully removed by applying chemical etching means.
In addition, the mechanical/chemical polysync mentioned above,
In chemical etching, two of the same composition are used.
Despite using a colloidal solution of silicon oxide powder (20% by weight) and water (80% by weight), the difference in surface removal performance between the two methods is that
This is because when applying the mechanical chemical polysink means, the products of the chemical reaction are mechanically removed so that a fresh colloidal solution is exposed to the sapphire surface.

In the method for manufacturing the information signal reproducing needle of the present invention, at least one of the plurality of surfaces adjacent to the sliding surface of the reproducing needle main body
By sequentially applying mechanical/chemical polysink means and chemical etching means to the material of the recycled needle body, the surfaces formed as described above can be formed. The surface becomes smooth, and the line of intersection between the surface and the sliding surface does not have a continuous broken line. Therefore, in the recycled needle made according to the manufacturing method of the present invention, the sliding surface It is possible to significantly reduce the phenomenon of scratches on the surface of the disk due to contact, it is also possible to greatly reduce the phenomenon of dust adhering to the recycled stylus, and the process-distorted layer can be effectively removed. Therefore, the phenomenon of the playback needle becoming chipped during the playback operation is greatly reduced.

When applying the method of the present invention, all surfaces adjacent to the sliding contact surface are treated with mechanical/chemical polysink means,
It goes without saying that the best results are obtained when processing and forming is performed sequentially with chemical etching, but it is important to form the edges on the conductor surface side to which dust tends to adhere. Even when processing and forming only the surface or the surface to which the electrode is attached is performed by sequentially applying mechanical/chemical polysink means and chemical etching means, it is possible to prevent dust from adhering to the material and prevent chipping of recycled needles. Good effects such as prevention can be obtained.

As described above, according to the method for manufacturing an information signal reproducing needle of the present invention, it is possible to easily provide an information signal reproducing needle that satisfactorily solves the problems mentioned above that have arisen in conventional reproducing needles. can do.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an example of a regenerated needle, and FIG. 2 is an enlarged perspective view of a part of the regenerated needle for explaining the state of the edge of the sliding surface in a conventional regenerated needle.

Claims (1)

[Scope of Claims] 1. At least one of a plurality of surfaces adjacent to the aforementioned sliding contact surface in a regenerating needle main body made of a high hardness material having wear resistance and having a sliding contact surface that comes into sliding contact with the information recording medium disc. A method of manufacturing an information signal reproducing needle in which one surface is formed by sequentially applying mechanical/chemical polishing means and chemical etching means to the material of the reproducing needle body. 2 Sapphire is used as the material for the recycled needle body, and a colloidal solution of silicon dioxide powder and water is used when processing the recycled needle body by mechanical chemical polishing means and chemical etching means, respectively. A method for manufacturing an information signal reproducing needle according to claim 1.