JPS5828642B2 - Rokuon Bali - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording stylus used during cutting recording of a recording disc such as a record, and the record playback stylus damages the signal of the sound groove by intensively tracing a part of the sound groove.
This solves the drawback of conventional reproduction that degrades tracing ability.

By using a recording needle with an included angle of 90 degrees, for example, a recording needle with two slopes tilted in the 35-55 degree manner, 3.
By creating a 5-55 degree sound groove, it is possible to apply even stylus pressure to the left and right walls of the sound groove, which change from time to time, and at the same time, it is intended to significantly improve tracing ability. be.

The sound groove of conventionally used stereo records is 45mm on the left and right, with the perpendicular line perpendicular to the top of the record as a reference.
It was cut using the 13j-451i method.

When recording a stereo record, the signals of each channel are recorded on both slopes of a sound groove that is at 90 degrees to each other. The basic structure is that the playback needle is moved horizontally and vertically and the signal is detected by changing the angles at right angles without disturbing the angles.

The recording stylus used to cut this record is made of steel, sapphire, or diamond.
The width of the needle tip is shaped to suit the size of the desired sound groove, but the included angle of the needle tip has traditionally been 45 degrees to 45 degrees with respect to the perpendicular. , 8
The angle was within the range of 7 degrees to 90 degrees.

From the above, in a record playback system, the mass of the playback stylus and its supporting system, such as the cartridge, head shell, arm shaft, counterweight, etc., can be adjusted vertically by moving the counterweight, etc. You can freely select the stylus pressure applied to the groove.

By the way, during playback, the playback needle, its support system, cartridge, head shell, arm shaft, counterweight, etc. total approximately 300'? Irrespective of the above, the force necessary to move a support system with a mass of It depends on the system.

An inside force canceller device is installed for the purpose of canceling the force that causes the record player arm for high-fidelity playback to rotate toward the center of the record.

However, this device only cancels the force that causes the arm to move inward, and in response to the ever-changing shape of the sound groove, it always has a value set for the two sound groove walls, such as 2.
Effect 1 of continuing to apply needle pressure equal to ×-1 is not achieved.

Therefore, in a conventional record player, due to its structure, an elastic body called a damper that supports the playback stylus and cantilever during playback has a total mass of 3.
0 (l) will be extremely twisted because it has a small elastic force compared to the amount of force used to move it gradually inside the record.

For this reason, the tip of the playback stylus using the conventional method intensively traces parts of the left and right walls of the record sound groove.
It had two major drawbacks: it damaged the signal carved into the sound groove, and at the same time it degraded the tracing ability during playback.

For this reason, in 4-channel playback, especially CD-4
The reproduction method has the disadvantage that the above-mentioned problem is greatly noticeable due to the fine irregularities in the sound groove.

JIS standard 88502-1973 states: (1) The direction of one rotation is clockwise toward the surface being played.

2. It is assumed that the record is recorded in the direction in which the pickup advances from the outside to the inside of the record.

It is stipulated that The reason for this is: (a) Tracing strain and trunking strain become larger as they move toward the inner circumference, so use the outer circumference where it is more advantageous.

At the mouth and inner circumference, a sound groove may be formed whose radius of curvature is smaller than the spherical radius of the tip of the reproduction needle, resulting in distortion.

The linear velocity becomes smaller on the inner circumference.

Therefore, there is more strain on the inner circumference than on the outer circumference.

etc. can be considered.

However, this direction of rotation and recording direction generates two unnecessary forces on the playback stylus and its support system: A1, a force that prevents it from moving outward, and B1, a force that moves it toward the center of the record. .

In order to confirm the above two phenomena, the direction of the a1 rotation is set in the opposite clockwise direction.

b. Set the recording direction so that the pickup faces from the inside of the record to the outside.

It is a good idea to conduct an experiment that satisfies these two conditions.

The basic principle of the present invention will be explained below with reference to the drawings.

As shown in Figure 1, according to the observation results of the relationship between the stylus tip 1' and the record sound groove 2 during playback based on the JIS standard, the stylus tip 1' is pushed toward the inside of the record by the sound groove wall 2'. It was confirmed that the playback needle 1 was not perpendicular to the record surface 3, but was tilted 12 degrees to the outside of the record.

FIG. 2 shows the relationship between the stylus tip 1' and the sound groove 2 of the record during a reproduction experiment that satisfied the two conditions mentioned above.

The reproduction needle 1 is perpendicular to the record surface 3, and the relationship between the two is maintained in an almost ideal manner.

Therefore, in the regeneration based on the JIS standard, the elastic bodies 6 and 7 that attach the regeneration needle 4 and cantilever 5 shown in FIG. 3 to the cartridge are connected to the regeneration needle 4 shown in FIG. , head shell 9, arm axis 1
0, counterweight 11, etc., totaling about 3001 mass, is twisted in order to move it to the inside of the record.

It turns out that.

By the way, in the reproduction based on the JIS standard, in order to avoid applying the two unnecessary forces mentioned above to the sound groove, the linear tracking player shown in FIG. 5 is used.

In this linear tracking player, the force for moving the playback needle and its support system in the direction of the arrow, that is, in the lateral direction, is expressed as shown in FIG. 6a.

As shown in b, the feed cylinder 12 is constantly rotating.
However, the effect is insufficient.

Therefore, the position of the playback needle in each sound groove can be detected by using something without mass, such as a light beam, to detect the playback needle and its support without applying a horizontal mass load to the playback needle. It is necessary to improve it so that the lineage can be moved inside the record.

However, in reality, a linear tracking player device that satisfies the above conditions would be far too expensive and complicated to meet the demand, far exceeding the general price and usability requirements for home appliances. Can not.

Therefore, there is a need for a device that is inexpensive, readily available, and easy to manage.

In view of the above, the present invention focuses on the recording needle used when cutting records.

Embodiments according to the present invention will be described below with reference to the drawings.

Figure 7 shows the inclination A of the record surface 3 that can achieve the stylus pressure of 1' and the stylus pressure during conventional playback based on the JIS standard.
This shows the degree and sound groove 2.

However, in reality, records with a slope like the one shown in Figure 7 are not only difficult to produce, but also lead to a significant increase in price, and there are many factors that make them unsatisfactory as a product in terms of maintenance and management. It is.

FIG. 8 shows the sound groove of a record according to the present invention, which improves the above-mentioned drawbacks.

With reference to a perpendicular line 13 that intersects at right angles to the record surface 3, the left wall 14 forming the sound groove 2 maintains an inclination of, for example, 35 degrees toward the inside of the record, and the right wall 15 of the sound groove slopes in the opposite direction. For example, the sound groove 2 is formed by maintaining an inclination of 55 degrees and forming slopes that form an angle of 90 degrees.

For this reason, as shown in FIG.
As mentioned in the beginning, due to two unnecessary forces that occur during conventional playback, the right wall 2' of the 8- to 12-degree sound groove pushes the record inward, causing the sound to pass through the playback stylus. The stylus pressure applied to the groove is equally applied to the left wall 14 and right wall 15 of the record sound groove.

FIG. 9 shows a recording stylus according to the present invention which is capable of producing the above-mentioned records.

a represents a front view and b represents a side view.

In FIG. 9a, the included angle of the recording needle 16 is from 87 degrees to 9 degrees.
It becomes 0 degrees.

For example, one of the slopes 17 has an angle in the range of 33.5 degrees to 35 degrees toward the inside of the record with respect to the perpendicular 18, and the other slope 19 has an angle of 5 degrees toward the outside of the record.
For cutting records, etc., which has an angle inclination within the range of 3.5 degrees to 55 degrees, and has two slopes 17 and 19 forming an included angle of the needle tip that is approximately 87 degrees to 90 degrees to each other. This shows the recording needle.

FIG. 10 shows the result of playing back and listening to the noise produced by a record cut using the recording needle formed at an angle as described above.

The horizontal axis shows the number of times the record was played, and the vertical axis shows the amount of noise.

Furthermore, the curve shown by the dotted line represents the increase curve of the number of plays and the noise when using a conventional record, and the curve shown by the solid line represents the increase curve of the number of plays and the noise of the present invention. .

In the method according to the present invention, the figure shows that the noise value at 500 playbacks is almost equal to the noise amount at 15 playbacks in conventional playback, and has a large difference from the maximum noise level at both playbacks. I understand that.

As described above, the record using the recording stylus according to the present invention can be cut by tilting the sound groove of the record in advance by the angle at which the stylus tip is pushed inward of the record during playback in the conventional rotating direction. It has the effect of achieving Win's equivalent stylus pressure on the left and right sound groove walls during playback, and is particularly effective in all playback methods that have been used, especially in 4-channel playback, especially in the CD-4 playback method. In the method where the sound groove has fine irregularities, damage to the sound groove and noise are improved to 1710 or less than that of the conventional method.

In practical terms, damage to the sound groove, noise, and deterioration of sound quality due to playback can be almost completely prevented.

At the same time, in the present invention, since the playback needle operates while maintaining an ideal relationship with the sound groove during playback, tracing ability is dramatically improved and high-fidelity playback can be realized.

Furthermore, since no improvement is required in the reproduction system, it can be used with conventional equipment by simply replacing the record.

Above all, the present invention is inexpensive and has many features, such as being able to improve sound groove damage and provide high-fidelity reproduction at the same time.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the conventional reproduction needle and sound groove, Figure 2 is a cross-sectional side view of the ideal reproduction needle and sound groove, Figure 3 is a perspective view showing the configuration of the vibration system, and Figure 4. is a side view showing the configuration of the regenerating needle and support system, Figures 5 and 6 a and b are perspective views of the linear tracking player, a perspective view of the main parts, and a diagram of the principle, and Figure 7 is the realization of equivalent needle force. FIG. 8 is a cross-sectional side view of the sound groove according to the present invention; FIGS. 9a and b are front and side views of a recording needle according to an embodiment of the present invention; FIG. 10 is a reproduction・This is a comparison chart of trial listening results. 16... Recording needle, 17, 19... Slope.

Claims (1)

[Claims] 1. It has two slopes with an included angle of 87 degrees to 90 degrees at the tip, one slope being smaller than 45 degrees to the perpendicular, and the other slope being larger than 45 degrees to the perpendicular. A recording needle.