JPS6040096B2 - Recycled needle polisher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called capacitance type reproducing device that detects signals recorded as concentric or spiral recording tracks on a disc-shaped recording medium as changes in capacitance. This relates to the recycled needle polishing machine used, which enables more effective recycling when replacing recycled needles or after being used for a long time.

Currently, as disclosed in Tokubatsu No. 54-140516, for example, a disc-shaped recording medium (disk) on which information signals are sequentially recorded in a concave-convex shape (bit) so as to form a spiral recording trajectory on its surface is rotated and released. A capacitance reproducing method in which the recording locus is scanned by a reproducing needle having an electrode attached to one side of a pentagonal columnar needle base made of diamond or the like, and the uneven shape is detected as a change in capacitance by the electrode. is considered.

In such a capacitance playback method, if the recorded signal is to be efficiently detected as a change in capacitance, the gap between the electrode attached to the playback needle base and the recorded disk surface must be at least 500A. It is hoped that

However, at present, it is considered to be extremely difficult to maintain the gap within 500A in any case due to the accuracy of mounting the regenerated needle on the device, wear of the electrode portion, etc.

That is, as shown in FIG. 1, the regeneration needle 1 is brought into pressure contact with the disk 3 via the cantilever 2. At this time, the regeneration stylus 1 and the disk 3 are ideally aligned as shown in FIG.
Good playback can be expected if the surfaces of the disks come into contact with each other, or if the electrode 4 of the playback needle 1 and the disk 3 come into contact, which is not ideal as shown in Figure 2A, but as shown in Figure 3A, good playback can be expected. , with the regeneration needle tilted perpendicular to the running direction,
Alternatively, as shown in Figure 3, if the electrode 4 is installed in a direction away from the disk surface and inclined in the running direction of the reproducing needle, gaps 5 and 6 are created between the disk surface and the electrode 4. Good playback cannot be expected.

Such a situation occurs when the regenerated needle is replaced together with the cantilever, but it is difficult for a general user to adjust this attachment state.

In addition, when the regenerated needle is used for a relatively long time, the electrode 4, which is made of diamond or the like and has inferior wear resistance than the regenerated needle base 1', is worn out, resulting in a gap 7, as shown in Fig. 4, which increases the regeneration efficiency. worsens. The present invention provides a polishing machine that allows even a general user to easily correct the condition shown in FIG. 3 or FIG. 4 when the regenerated needle is replaced or after long-term use. The polishing disk of the present invention can be placed on the turntable of a general playback device in place of a recording disk, or can be replaced with the turntable.
When this polishing disc 7 is installed in a playback device, the thickness of the polishing disc 7 is set in advance so that it is at a height above the surface of the disc 3 installed, as shown in FIG. .

When the regeneration needle 1 is brought into contact with the polishing plate 7 located at a position higher than the disk surface in this way, the deformation of the cantilever 2 increases, and the supporting relationship between the regeneration needle 1 and the polishing plate 7 is as shown in FIG. become.

When the polishing plate 7 is rotated in this state and the regenerating needle 1 is polished, the regenerating needles having the contact relationship with the disk as shown in FIG. 3A and FIG. , mouth, and c are polished as shown in .

After polishing, when the polishing plate 7 is removed and the disk 3 is installed, the polished regeneration needles shown in FIG. Therefore, good regeneration can be expected. As described above, according to the present invention, even a general user can make corrections so that a good reproducing operation can be expected by simply installing a polishing machine in the reproducing apparatus.

[Brief explanation of drawings]

Fig. 1 is a side view showing an overview of the main parts of the capacitive type reproducing device, Figs. 2, 3, and 4 are enlarged views showing the support state of the reproducing needle and the recording medium, respectively, and Fig. 5 is a side view showing the operating principle of the present invention, FIG. 6 is an enlarged view of the same part, FIG. 7 is an enlarged view showing the polished length according to the present invention, and FIG. 8 is a side view showing the polishing machine according to the present invention. FIG. 6 is an enlarged view showing the regenerated state of the regenerated needle. 1... Regeneration needle, 2... Cantilever, 3...
...7 isks, 4...electrodes, 7...
...Grinding machine. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. A reproducing needle with an electrode provided on the side surface of the needle base is provided at the end of the cantilever, and the reproducing needle is brought into contact with the surface of a disc-shaped recording medium, and changes in the capacitance between the electrode and the recording medium are sequentially detected. A capacitive type reproducing device is removably attached to the disk-shaped recording medium in place of the disk-shaped recording medium, and is positioned higher than the surface of the disk-shaped recording medium toward the playback needle side when the disk-shaped recording medium is installed in the device. Recycled needle polishing machine constructed.