JPH034962Y2 - - Google Patents

Description

[Detailed description of the invention] A recording and reproducing method in which information signals are read from a recording medium by a reproducing element that includes a reproducing needle that contacts the surface of the recording medium is used, for example, to read out information signals from a disc record. This method is widely used in signal reproducing devices and various information signal reproducing devices that read out information signals by detecting changes in capacitance values.

Incidentally, in a signal reproducing apparatus that implements the above-mentioned recording and reproducing method, the reproducing needle that contacts the recording medium is required to have a long life. Therefore, the playback needle has a structure that uses a high-hardness material such as diamond or sapphire in the part that contacts the recording medium to ensure stable and good playback conditions over a long period of time. have been used for a long time.

FIG. 1 is a perspective view showing an example configuration of a reproducing needle used in a recording/reproducing method in which reading of an information signal from a recording medium is performed by detecting a change in capacitance value. In FIG. 1, 1 is a base portion of a regenerated needle made of, for example, a titanium rod, and 2 is a base portion of a recycled needle.
is a solder material (for example, a metal solder containing silver as a main component) used to fix the high hardness material part 3 to the tip of the base part 1. For example, natural or artificial diamond, sapphire, or the like is used as the structure of the high-hardness material portion 3 fixed to the tip of the base portion 1, and the high-hardness material portion 3 is polished. For example, by
The regenerated needle has an outer shape as shown in the figure.
In Fig. 1, 4 is the electrode forming surface, 5 and 6 are the back surface,
7 and 8 are introduction surfaces, 9 is a sliding surface, and the above 4 to 4 are
Each surface of 9 is formed as desired by the above-mentioned polishing process, and an electrode is formed on the electrode forming surface 4 by adhering a thin film of titanium or hafnium, for example.

In the conventional reproducing needle, the base part 1 is regenerated so that the high hardness material part 3 that contacts the surface of the recording medium has the outer shape required depending on the use of the reproducing needle. A needle mother body is formed, and a high hardness material portion 3 is fixed to the end portion thereof with a solder material 2.
A regenerated needle having a desired outer shape was produced by performing necessary polishing on the tip.

FIG. 2 is an explanatory diagram of the case where a recycled needle is made from a conventional recycled needle base, and in FIG. 2, 1 is a recycled needle base A made of, for example, a titanium rod 1; A recess is provided at the tip of the regenerated needle base A by, for example, a punch, and a high hardness material portion 3 made of diamond, sapphire, or the like is fixed to the recess with a suitable metal solder 2.

The regenerated needle base A has a diameter of, for example, 1 mm, and its base is inserted into a hole 12 bored in the end of an iron support (spindle) 11 with a diameter of, for example, 2 mm, and is glued, for example, with an adhesive. Thus, the base portion 1 and the spindle 11 are fixed to be integral. The end of the spindle 11 is inserted into the hole 14 formed in the arm 13 of the polishing angle adjusting device of the polishing machine, so that the spindle 11 and the arm of the polishing angle adjusting device of the polishing machine are connected to each other. 13 are connected and fixed.

In the polishing process for the recycled needle base A and the high-hardness material portion 3, the recycled needle base A is
This is done by sequentially adjusting the angle with a polishing angle device so that the high hardness material part 3 at the tip of the needle is pressed at a predetermined angle. Regarding fixation with
The high hardness material to be fixed to the recycled needle stock A is usually fixed to the recycled needle stock A without consideration given to the orientation of its crystal plane. 11 to the arm portion 13 of the angle adjustment device of the polishing machine, each surface of the high hardness material portion 3, that is, the axis 10 of the base portion 1 (the first
For a virtual surface that passes through the center of surface 4 and
It is difficult to polish a high-hardness material so that surfaces 5 and 6, or surfaces 7 and 8, which should be symmetrical, become crystallographically identical crystal planes. It was hot.

A specific explanation regarding this point is as follows. High hardness materials such as diamond or sapphire used as the constituent material of the high hardness material portion 3 have crystallographically determined crystal planes, and in relation to the crystal planes, there are surfaces and directions that are easy to polish, and surfaces and directions that are difficult to polish. There are different planes and directions.

Therefore, when polishing the high-hardness material in the recycled needle base A to produce a recycled needle with a desired external shape, polishing is performed on the easy-to-polish surface of the high-hard material and along the easy-to-polish direction. If you do not perform polishing, the machining efficiency will decrease.
When polishing high-hardness materials, adjust the polishing angle with the polishing angle setting device in the polishing machine based on the crystallographically determined orientation of the crystal plane of the high-hardness material being processed. However, in the conventional regenerated needle base A explained with reference to FIG. The orientation is not adjusted to a specific part of the regenerated needle base A, and when the regenerated needle base A and the spindle 11 are fixed, and the spindle 11 and the arm portion 13 of the polishing angle adjustment device are When fixing, it was not possible to always maintain the reference positional relationship between the two joining members to be joined, so the orientation of the crystal plane in the high hardness material was adjusted using the polishing angle adjustment device. Therefore, when making a regenerated needle with an external shape as shown in the first drawing, for example, by adjusting the angle in the polishing angle device, the surface 5 and surface 6, or surface 7 and surface 7 are 8 by polishing, it is difficult to polish surfaces 5 and 6 or surfaces 7 and 8 so that they become crystallographically the same crystal planes, and therefore, for example, During polishing, there are problems such as significant differences in the polishing time required for each surface, which impairs workability, and the resulting recycled needles have different wear resistance on each surface. be.

The present invention has been made with the purpose of providing a regenerated needle base that eliminates the drawbacks of the conventional recycled needle base as described above, and the specific details of the regenerated needle base of the present invention are attached below. A detailed description will be given with reference to the drawings.

FIG. 3a is a front view of the regenerated needle base of the present invention, and FIG. 3b is a side view of the same, partially shown in cross section.
Further, FIG. 4 is a partial side sectional view showing a state in which the regenerated needle base of the present invention is attached to an arm of a polishing angle adjusting device in a polishing machine.

In FIGS. 3a and 3b, reference numeral 15 is a regenerated needle base of the present invention, and this regenerated needle base 15 is made of a metal such as titanium and has a diameter D _a that is to be made into a part of the regenerated needle. 1 rod-shaped portion 15a and diameter D _b
and the second rod-shaped portion 15b are made to be integrally continuous. In the illustrated example, the regenerated needle base body 15 is shown as having a portion 15d whose diameter gradually changes interposed between a first rod-like portion 15a and a second rod-like portion 15b.

The diameter D _a of the first rod-shaped portion 15a and the diameter D _b of the second rod-shaped portion 15b have a relationship of D _a <D _b , and in the vicinity of the end surface 15b ₁ of the second rod-shaped portion 15b, Regenerated needle base body 15 consisting of first and second rod-shaped parts
A regulating surface _15b2 is provided which is inclined with respect to the axis of the.

The aforementioned regulating surface 15b ₂ may be formed as a flat surface or a curved surface, but the illustrated example shows a case where the regulating surface 15b ₂ is formed as a flat surface. There is.

In addition, an indentation 16 formed by an indenter having a shape similar to the outer shape of the high-hardness material part 3 in order to fit the high-hardness material part 3 into the end surface 15a ₁ of the first rod-shaped part 15a, etc. An inset hole like this is drilled. Natural diamonds, artificial diamonds, sapphire, etc. can be used as high-hardness materials, but since the use of artificial diamonds is a preferred embodiment, Figures 5a and 5b show representative crystal forms of artificial diamonds. Two examples are shown below. Artificial diamonds with crystalline forms as shown in Figures 5a and 5b are recognized to exist with a high probability in commercially available synthetic diamonds (for example, MPSD type synthetic diamonds manufactured by GE in the United States). The artificial diamond in the crystal form shown in Figure 5a has a hexagonal {111} shape.
The outer shape is formed by the octagonal {100} plane and the triangular {100} plane. The outer shape is formed by {111} planes.

The plurality of {111} planes in the diamond crystal shown in Figure 5a are the same as those in the diamond crystal shown in Figure 5a.
If the diamond crystal is an octahedron, which is indicated by dotted lines in the figure, each of the eight faces is a part of each face. This corresponds to the truncated cross section of the eight apex corners of an octahedron as shown in .

When an artificial diamond having an external shape as shown in FIG. 5A or _FIG. The indentation 16 to be made is formed by an indenter made by polishing a crystalline diamond having a predetermined face angle. In an artificial diamond, the face angles between the crystal planes that make up its external shape are all determined crystallographically, and each crystal plane has good flatness. Since the ridge line is a straight line, the indentation 1 formed by the indenter
Even if diamonds of different sizes are inserted into the indentation 6 as a high hardness material, the orientation of the crystal plane of the diamond inserted into the indentation 16 can be regulated by the indentation 16.

Therefore, the first rod-shaped portion 1 of the regenerated needle matrix 15
The indenter is indented in such a manner that the specific surface of the indentation 16 to be formed on the end surface _15a1 of the regenerated needle base 15 always shows a predetermined relationship with respect to the reference surface set on the regenerated needle base body 15. If the indentation 16 is formed by
By inserting the diamond used as the high hardness material part 3 into the indentation 16 formed on the end surface 15a ₁ of the first rod-shaped part 15a of No. 5 in such a manner that it shows good seating, The inlaid diamond has its crystal plane orientation regulated by the indentations 16, and the diamond is regenerated in a state in which the diamond exhibits the correct orientation with respect to the reference plane set on the regenerating needle base 15. It becomes possible to fix it to the needle base body 15.

The reference plane set on the recycled needle base 15 described above is the second reference plane in the recycled needle base 15.
The aforementioned regulating surface 15b ₂ formed near the rear end of the rod-shaped portion 15b may be used.

FIG. 4 is a partially vertical side view showing the state in which the recycled needle base of the present invention shown in FIG. In the figure, 14 is a hole in the arm part 13 of the polishing angle adjusting device, and 17 is a receiving plate.
7 is in contact with a regulating surface 15b ₂ formed near the rear end of the second rod-shaped portion 15b of the regenerated needle base 15, and the regenerated needle base 15 is brought into contact with the arm portion 1 of the polishing angle adjusting device.
The posture of the regenerated needle base body 15 when inserted into the hole 14 of No. 3 is restricted.

That is, the hole 1 of the arm part 13 of the polishing angle adjusting device
The receiving plate 17 protrudes into the hole 14, and when the regenerated needle base 15 is inserted into the hole 14, the regulating surface 15b formed near the rear end of the second rod-shaped portion 15b in the regenerated needle base 15 ₂ (Reference surface 15 of recycled needle base
b ₂ )) and the surface that comes into contact with it (reference surface of the polishing angle device)
When the recycled needle base 15 is inserted into the hole 14 and the regulating surface 15b ₂ of the recycled needle base 15 is brought into contact with the surface of the receiving plate 17, the reference surface of the recycled needle base 15 and the polished Perform an operation to match the reference plane of the angle adjustment device.

Therefore, the regenerated needle base 15 is inserted into the hole 14 of the arm part 13 of the polishing angle setting device in the polishing machine, and the regenerated needle base is inserted into the hole 14 of the arm part 13 of the polishing angle setting device in the polishing machine, and with the regulating surface 15b ₂ of the regenerated needle base in contact with the surface of the receiving plate 17. 15 and the arm part 13 of the polishing angle adjusting device, the polishing angle in the polishing angle adjusting device can be adjusted by adjusting the direction of the reference plane of the recycled needle base 15 and, in turn, the direction of the high hardness material fixed to the recycled needle base 15. This can be done accurately regarding the orientation of crystal planes.

Note that the surface of the receiving plate 17 is made to match the regulating surface _15b2 formed on the recycled needle base body 15, but the receiving plate 17 is not limited to a plate-shaped one, for example, a recycled needle may be used. It may be a pin-shaped member that can engage with the regulating surface _15b2 of the base body 15. In any case, the receiving plate 17 can be used to connect the recycled needle base body 15 and the arm portion 13 of the polishing angle setting device. In connection, the function of the stopper when the regenerated needle base 15 is inserted into the hole 14 of the arm 13, and the regenerated needle base 1
Any configuration may be used as long as it has a function of preventing rotation within the hole 14 of No. 5 and a function of matching the reference plane of the regenerated needle base body 15 with the reference plane of the polishing angle adjusting device. It is okay to do so.

The regenerated needle base 15 of the present invention has a high hardness material portion 3 such as diamond firmly inserted into a hole such as an indentation 16 made in the end surface _15a1 of the first rod-shaped portion 15a. By fixing the high hardness material part 3 to the recycled needle base body 15 in the state of
Needle base 1 for regenerating the orientation of crystal planes in high-hardness materials
5, and the regulating surface 1 formed near the rear end of the second rod-shaped portion 15b of the regenerated needle base body 15.
5b ₂ is brought into contact with the surface of the receiving plate 17 provided on the arm portion 13 of the polishing angle adjustment device, the angle adjustment in the polishing angle adjustment device can be performed by adjusting the orientation of the crystal plane in the high hardness material fixed to the recycled needle base. Therefore, if the recycled needle base of the present invention is adopted, each polishing surface of the recycled needle can be polished well, and the present invention eliminates all the drawbacks of the conventional method. It is clear that this problem can be resolved.

In addition, in the regenerated needle base of the present invention, after the required polishing process is completed on the high hardness material part 3 fixed thereto, the first rod-shaped part 15a is polished as necessary, and then First rod-shaped part 1
5a and the second rod-like portion 15b are separated, and the first rod-like portion 15a is polished so that it becomes the base portion of the regenerated needle with a predetermined diameter, thereby producing a regenerated needle. . In addition, the first
from the tip of the rod-shaped portion 15a to the second rod-shaped portion 15b.
The regenerated needle base body may include the first rod-shaped portion 15a whose diameter gradually increases until the first rod-shaped portion 15a gradually increases in diameter.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a regenerated needle;
The figure is a partial side sectional view for explaining a conventional regenerated needle base.
Figures 3a and 3b are a front view of the regenerated needle base of the present invention and a side view showing a part of the same in cross section, and Figure 4 is a view of the regenerated needle base of the present invention attached to the arm of the polishing angle adjustment device. The partially sectional side view of the state, FIGS. 5a and 5b, is a perspective view of the artificial diamond crystal. 15...Recycled needle matrix, 3...High hardness material part, 1
3... Arm part of polishing angle setting device, 14... Hole, 1
5a...First rod-shaped part, 15b...Second bar-shaped part, 15b ₂ ...Restriction surface, 16...Indentation, 17...
catch plate.

Claims (1)

[Scope of utility model registration request] The tip that comes into contact with the recording medium is made of a high hardness material part formed in a predetermined shape,
A reproducing needle base body used to constitute a reproducing needle in which information signals are read from a recording medium while the above-described high-hardness material portion is in contact with the surface of the recording medium. a second rod-like portion that is integrally continuous with the first rod-like portion and has a larger diameter than the first rod-like portion; A fitting hole having a shape approximating the outer shape of a crystal of a high hardness material to constitute the high hardness material part is formed in the end face of the first rod part, and a fitting hole is formed in the end face of the second rod part. The regenerated needle base body is provided with a regulating surface that is inclined with respect to the axes of the first and second rod-shaped portions in the vicinity of the regenerated needle base body.