JPS606884Y2 - Recycled needles for stampers - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a playback needle for previewing a well-known metal mask or stamper used in the record manufacturing process, which was previously impossible to preview.

The metal mask or stamper used in the record manufacturing process is negative for the record, and when trying to listen to it, it was impossible to play it with a regular record playback needle.

In a record, stereo left and right signals are recorded on both walls of the V-shaped groove, which is the sound groove.
A regenerated needle is fitted into the groove in contact with both walls thereof.

On the other hand, in the metal mask or stamper that is the negative of the record, stereo left and right signals are recorded on both walls of the negative crest of the V-shaped groove, and therefore, conventionally It was not possible to test the metal mask or stamper with the playback needle.

Therefore, in the past, people would listen to lacquer master discs, metal mother discs, or manufactured records during the record manufacturing process.

This invention enables previews to be performed not only on the lacquer master and the metal mother in the record manufacturing process, but also on the metal mask in the pre-process of the metal mother, or the stamper before the record to be manufactured, to detect defects in the recording. In order to discover the problem as early as possible, the purpose is to provide a reproduction needle that can be used to test these metal masks or stampers.

As a prior art for this type of regenerated needle, Japanese Patent Application Laid-Open No. 53-133
Recycled needles as shown in Figure 1 A, B, and C are disclosed in the 40th Gazette.

Figure A is a perspective view of the recycled needle, Figure B is a front view of the needle tip in contact with the stamper, and Figure 0 is a plan view of the needle tip. An original shape consisting of a sapphire cylinder part 1a and a conical tip 1b is cut and polished in the axial direction of the cylinder part 1a and part of the tip 1b, and the other needle is similarly cut and polished. The cutting and polishing portion of the tip 1' is joined to the tip 1' and held by the cantilever 2.

Then, the inverted V-shaped portion 1c formed between the pointed ends 1b and lb' of the needle tips 1 and 1' is brought into contact with the grooves 3a of the stamper 3, which is the negative of the record groove, for example, by straddling the grooves 3a. I'm trying to listen to Stampa.

The disadvantage of recycled needles is that diamonds and sapphires are hard, so cutting and polishing them is difficult, and welding needles whose tip is made of titanium or other metal as the base material are difficult to cut due to the difference in hardness of the materials. It is extremely difficult to polish and cannot be used.

In addition, since this type of recycled needle traces metal crests such as metal masks and stampers, the tip of the needle is subject to severe wear, so it needs to be inexpensive so that it can be easily replaced. Recycled needles are not suitable for that.

This invention provides a regenerated needle for a stamper that eliminates the above-mentioned problems, and an embodiment shown in FIG. 2 and subsequent figures will be described in detail.

Fig. 2 is a perspective view of the regenerated needle of this invention with the needle tip in contact with the stamper, Fig. 3 is a front view of the same, and Fig. 4 is a side view of the regenerated needle of this invention. It is a cantilever, and its tip is formed into a chevron-shaped flat part 4a with a predetermined angle.

5.5' is a needle-point tip made of diamond or sapphire, which is the same as that used for record playback, and has cylindrical parts 5a, 5a', a conical or other pointed part 5b,
5b', therefore, these needle tips 5, 5' are exactly the same as those for record reproduction, and no other special cutting or polishing is performed.

The proximal ends of these needle tips 5, 5' are attached to the lower surfaces 4b, 4b' of both slopes of the chevron-shaped flat part 4a of the cantilever 4, with their pointed ends 5b, 5b' placed back and forth at a predetermined interval. Both slopes 6b, 6 of the ridges 6a of the stamper 6 are arranged so as to be offset and diagonally opposed when viewed from the front, and both the apex portions 5b, 5b' are the negatives of the record grooves.
It is provided so as to protrude so as to come into contact with b'.

Therefore, in this embodiment, as shown in FIG. The apex angle formed by the pointed ends 5b and 5b' of the needle tip 5°5' when viewed from the front can be 90° or less.

This is done because if the angle between the pointed ends 5b and 5b' is 90 degrees or more, the pointed ends 5b and 5b' will be adjacent to the crest 6a of the stamper 6 that protrudes in the 90' direction to be reproduced. Similar to the above, the mountain streak ω' protrudes at 90°.

This is because there is a risk of it coming into contact with the top of the porcelain and damaging it.

In this embodiment, the proximal ends of the needle tips 5, 5' are attached to the cantilever 4 by penetrating it from the lower surface to the upper surface of both slopes of the flattened portion 4a. ．． However, it is also possible to attach the proximal ends of the needle tips 5, 5' to the lower surfaces of both slopes of the chevron-shaped flat part 4a of the cantilever 4 with an adhesive.

It is also possible to simply form the tip of the cantilever flat and attach the proximal end of the needle tip to that portion as described above, or to attach the proximal end of the needle tip to a cylindrical cantilever as described above. Needless to say, it is also possible to attach other parts.

Further, the needle tip tips 5 and 5' may be offset back and forth and brought into contact, or the portions offset back and forth and in contact, or the portions offset back and forth and opposed to each other may be bonded with adhesive. You can stay there.

To listen to the stamper using the playback needle of this invention made as described above, attach the base end of the cantilever 4 to the same pickup cartridge as used for record playback.
The stamper placed on the turntable is rotated in the opposite direction to that for records, and the pointed ends 5b of the needle tips 5, 5' are
5b' as shown in FIGS. 2 and 3, both slopes 6b, 6b' of the crest 6a of the stamper 6, which is the negative of the record groove.
All you have to do is touch it and trace it.

It should be noted that, in addition to the stamper, metal masks can also be sampled in the same way, and therefore, it goes without saying that the present invention is not limited to reproducing needles for stampers.

As described above, this invention consists of a pair of needle tips placed at the tip of a cantilever, with both pointed ends offset back and forth at a predetermined distance, and arranged so that they face diagonally when viewed from the front. In addition, we have provided a recycled stylus for a stamper, which is configured so that its both pointed ends abut against both slopes of the ridges of the stamper, which is the negative of the record groove. In this way, the needle tip made of hard and difficult-to-cut materials such as diamond or sapphire is not specially cut and polished, and the needle tip conventionally made for general record playback can be used as it is at the tip of the cantilever as described above. Since it only needs to be attached to the holder, manufacturing is easy and the cost is low.

In addition, the apex angle of the pair of needle tips is offset back and forth at a predetermined interval, and by arranging them so as to face each other diagonally when viewed from the front. Even when using a needle tip with a tip of 45° or more, the apex angle of both tips when viewed from the front should be 90°.
The following can be done, and by doing this,
It has the advantage that there is no risk of the two pointed ends hitting and damaging the tops of ridges other than the ridges of the stamper to be reproduced, that is, adjacent to the ridges.

[Brief explanation of drawings]

Figure 1 shows a prior art regenerated needle for a stamper;
Figure 2 is a perspective view of the regenerated needle for a stamper of this invention with the needle tip in contact with the stamper, Figure 3 is a front view of the same, and Figure 4 is a side view of the regenerated needle for a stamper of this invention. It is a diagram. 4... Cantilever, 4a... Chevron flat part, 4b, 4b'... Lower surface, 5, 5'...
...Needle tip, 5a, 5a'...Cylindrical portion, 5b, 5b'...Point end, 6...Stamper, 6a... Yamajo, 6b, 6b'...
...Slope.

Claims (1)

[Scope of utility model registration request] A pair of needle tips are placed at the tip of the cantilever so that both tip ends are offset back and forth at a predetermined interval and are diagonally opposed when viewed from the front. A regeneration needle for a stamper that protrudes so as to come into contact with both slopes of the stamper's ridges, which are the negatives of the record groove.