JPS58194154A - Manufacture of electrostatic capacity type reproducing stylus - Google Patents

Abstract

PURPOSE:To make a polishing process easy, to decrease the number of stages and to improve the mass productivity, by polishing two surfaces of the stylus main body of an electrostatic capacity type reproducing stylus after polishing it into a cone shape, coating a conductive thin film and forming a contact surface. CONSTITUTION:The tip of the stylus main body 3 is polished into a cone shape. The two surfaces of the cone section 3a are polished to form surfaces 3b, 3c. A conductive electrode is adhered on a surface 3d by means of thin film technology such as sputtering to form an electrode 4 for signal detection. The thin film adhered on the surfaces 3b, 3c is removed by polishing it. Further, the stylus tip is polished to form the contact surface 3e.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an electrostatic method that detects and reproduces information as a change in capacitance by contacting a disc-shaped recording medium made of a conductive material on which information signals are recorded as pits (small depressions). The present invention relates to a capacitive regenerated needle, and particularly to a method of manufacturing a regenerated needle made by polishing a regenerated needle body.

In general, this type of regenerated needle is polished into a polyhedron so that the contact surface 1a at the tip of the needle body 1 is polygonal (here, a pentagon), as shown in FIG. A signal detection electrode 2 made of a thin film is attached to the regenerated needle. For example, a high hardness material with excellent wear resistance, such as diamond, is used for such a regenerated needle, and its tip is polished into a polyhedron of a predetermined shape. This was technically extremely difficult and difficult to mass-produce.

The present invention has been made in view of these points, and it is an object of the present invention to provide a method for manufacturing a regenerated needle that can be processed relatively easily and has excellent mass productivity.

The manufacturing process of one embodiment of the present invention will now be described with reference to the drawings shown in FIG.

Here, a high hardness material having r# abrasion resistance is used for the needle body, and the tip of the needle body 3 is first polished into a conical shape as shown in FIG. 2(a). Next, this conical part 3a is shown in FIG. 2(b).
After two-sided polishing as shown in the figure, these two surfaces 3b and 8c
A conductive thin film is applied to the conical portion 3d sandwiched between the two by using a thin film technique such as sputtering as shown by diagonal lines. And then the second surface 8b.

3c is lightly polished again to remove the conductive thin pattern attached to these two surfaces, and a signal detection electrode 4 of a predetermined width is formed on the conical surface 3a. Thereafter, as shown in an enlarged view in FIG. 2(c), the tip of the needle body is polished to form a contact surface 3e.

If the regenerated needle is processed and shaped using the method described above, that is, if the tip of the needle body is polished into a conical shape and then polished on two sides, it is possible to polish the tip into a polyhedron as in the conventional method. Compared to the conventional method, polishing is easier, the number of polishing steps is reduced, and the mass productivity of recycled needles is significantly improved.

As described above, if the manufacturing method of the present invention is used, it is suitable for mass production of recycled needles, and it becomes possible to significantly reduce the cost of recycled needles.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional general capacitance type regenerated needle, and FIG. 2 is a perspective view of the regenerated needle at each step according to the manufacturing method of the present invention. 3... Needle body, 3a... Conical part, 3 b +
8 c... Polished surface, 3e... Contact surface, 4...
・Signal detection electrode・

Claims (1)

[Claims] L The process of polishing the tip of the needle body made of high-hardness material into a conical shape, the process of applying a conductive thin film to a part of this polished conical part, and the part other than the part forming the signal detection electrode A method for manufacturing a capacitive regenerated needle, comprising the steps of: polishing away the conductive thin film of the needle; and polishing the tip of the needle body to form a contact surface.