JP2020087484A - Head shell and manufacturing method thereof - Google Patents

Abstract

To provide a head shell that has an excellent anti-vibration effect and can be easily attached and detached.SOLUTION: A gelatinous absorber 4 capable of being attached and detached is provided on top and bottom surfaces of a head shell body 1 formed of electroconductive plastic, and a pickup cartridge 5 is softly attached to the head shell body via the absorber, thereby achieving complete non-contact between the pickup cartridge and the head shell body.EFFECT: The above configuration allows a head shell capable of being attached and detached easily, which has an excellent anti-vibration effect against vibration, co-vibration, and the like generated in sound reproduction of a disk record and to/from which the absorber as a vibration absorber can be attached and detached and replaced easily.SELECTED DRAWING: Figure 1

Description

The present invention relates to a head shell and a method for manufacturing the head shell.

Conventionally, the basic structure of a record player has been composed of a turntable, a pickup cartridge, a tone arm, and a cabinet accommodating these. In the tone arm, the pickup cartridge is attached to the head shell at the tip. This pickup cartridge traces the sound groove of a record with a record needle (stylus) to convert the vibration waveform engraved in the sound groove into an electric signal. Then, the vibration waveform finally recorded on the record board is reproduced as sound.

Until now, head shells have emphasized rigidity and adopted hard metal or ceramic as the material of the main body, and fixed the pickup cartridge with screws or bolts of aluminum alloy or brass.
However, even with such a pickup cartridge, in reproducing an analog record using the pickup cartridge, the vibration generated when the turntable rotates, the vibration generated by the rattling of the tone arm fitting portion, etc. Functionally unavoidable vibrations and co-vibrations generated due to the material and shape of the tone arm are received through the tone arm, so that sound quality deterioration due to such vibration occurs. In addition, natural or artificial vibration that occurs in the environment where the record player is installed is also transmitted to the pickup cartridge. Furthermore, resonance or resonance may occur with respect to complicated vibration that occurs when the record needle traces the sound groove carved in the record. Due to the influence of such vibration on the record player, the waveform of the sound is distorted, and the sound is reproduced with a difference from the actual sound image.
Therefore, from the viewpoint of preventing resonance, a vibration absorber made of synthetic resin is fixedly integrated with the head shell, or the pickup cartridge is vibrated out of the main body of the head shell via a vibration absorbing material that is a separate member from the head shell. One that mounts the pickup cartridge so that it is in contact with one side of the absorber mounting surface, one that has notches, holes, and grooves filled with a vibration-proof material in the head shell body, and one that is made of a metal head shell base. There is one in which a vibration-absorptive molded plate is attached to either the upper surface or the lower surface. (For example, Patent Documents 1-5)

In addition, there are those that harden the material itself of the head shell or improve rigidity and weight reduction. (For example, Patent Document 6)

JP, 2018-63741, A JP-A-52-136604 Japanese Utility Model Publication No. 52-165601 Japanese Utility Model Publication No. 57-87307 Japanese Utility Model Publication No. 54-72505 JP-A-62-117102

In a conventional head shell, an elastic body which is a member different from the head shell or a structure in which a vibration absorbing material such as a vibration damping rubber is attached to the head shell is intended to improve the vibration damping effect. In this regard, in the head shells of Patent Documents 1 to 4, one of the head shells has a surface on which a vibration absorber formed so as to conform to the shape of a cube or a head shell is attached to the head shell body. It is fixed by being formed flush with the mounting surface of the head shell, or by fixing the vibration absorber integrally incorporated in the head shell body by flowing molten resin into the mold. ing.
Further, in the head shell of Patent Document 5, the notch, the hole, and the groove filled with the vibration damping material are merely provided on the outer peripheral portion of the head shell.
Further, as in the head shell of Patent Document 6, there is a head shell having a structure for obtaining a vibration absorbing effect by using light titanium or a hard plastic material as the material itself.

However, the head shell having these structures has the following problems.
(1) Even if the vibration absorber, such as an elastic body, has a property of exhibiting a certain degree of vibration absorbing effect, the vibration absorbing body is formed so as to be flush with the mounting surface of the vibration absorbing body of the head shell body. Since they are aligned, the vibration sucked up from the pickup cartridge cannot be escaped and is received at the surface portion.
That is, even if it is horizontal or vertical, since the vibration absorber has a structure in which it is sandwiched between the pickup cartridge and the head shell in a fixed state, it propagates from the pickup cartridge, that is, vibration from below. Cannot be escaped on the mounting surface of the head shell and will be received, and a sufficient vibration damping effect cannot be achieved.
(2) Notches, holes, grooves of the head shell and the structure in which the outer periphery of the head shell is filled with a vibration damping material, and even when covered with a vibration damping material, the vibration absorbing material and the ground plane of the head shell are wide Cannot be escaped and a sufficient vibration isolation effect cannot be achieved.
(3) Certainly, there is a vibration absorber between the mounting surface of the pickup cartridge and the head shell, but the head shell body should be protected so that the shaft or head of the screw or bolt for mounting the pickup cartridge does not fall off the head shell. It is squeezed in a state where it contacts and sticks to a part. Therefore, the vibration of the turntable eventually propagates to the head shell through the pickup cartridge, and the vibration generated from the tone arm also propagates through the screws or bolts attached to the pickup cartridge, so that the record needle is engraved on the record. It affects the complicated vibration that occurs when tracing the sound groove, and cannot sufficiently suppress resonance or resonance.
(4) Even if titanium is used as the material for the head shell as a rigid and lightweight material, it occurs when the turntable rotates and when the record needle traces the sound groove engraved on the record. It is insufficient as a vibration-proof measure against resonance or resonance caused by complicated vibration.
(5) On the other hand, for the vibration absorber, a material having a higher vibration absorbing effect is required to have flexibility and higher liquidity, but such a material has a faster deterioration rate in use. In this respect, in the head shell in which the head shell and the vibration absorber are fixedly integrated, it is uneconomical to replace or replace only that portion when the vibration absorber is deteriorated.

By the way, as mentioned above, through the tone arm, vibration that is unavoidable functionally of the record player such as vibration caused by rattling of the tone arm fitting part and co-vibration that occurs due to the material and shape of the tone arm are used. As measures against the propagating vibration, none of the conventional techniques described in the above patent documents can exhibit a sufficient vibration damping effect, and it is difficult to reproduce a faithful sound quality from a recording signal recorded on a record board. is there.

The present invention has been made to solve the above problems, and provides a head shell that has an excellent vibration damping effect, can be easily attached/detached, and an absorber that is a vibration absorber can be easily attached/detached and replaced. To aim.

The head shell according to the present invention made to solve the above technical problems,
A head shell body having a mounting surface to which the pickup cartridge is mounted, and a non-mounting surface facing the mounting surface;
An upper absorber located on the upper surface side of the non-attaching surface of the head shell body,
A lower absorber located between the mounting surface of the head shell body and the pickup cartridge,
The pickup cartridge, a mounting surface and a non-mounting surface of the head shell body, a rod-shaped connecting member which is inserted into a pair of through holes respectively provided in the upper absorber and the lower absorber, and which connects these,
The head shell, wherein a diameter of a pair of through holes provided on the mounting surface and the non-mounting surface of the head shell body is larger than a diameter of the fixing member and is not in contact with the connecting member.

According to the present invention, there is provided a head shell which has excellent vibration damping effect, can be easily attached/detached, and an absorber as a vibration absorber can be easily attached/detached and replaced.

It is a perspective view showing a head shell concerning an embodiment of the present invention. It is a top view of the head shell shown in FIG. FIG. 2 is an exploded view of the head shell body shown in FIG. 1. It is a side view of the head shell shown in FIG. 3 is a bottom surface of the head shell body shown in FIG. 1. It is sectional drawing of the head shell main body shown in FIG. FIG. 7 is a comparative waveform diagram of a head shell with a pickup cartridge fixed and a head shell body with a pickup cartridge softened. It is an exploded view showing a modification of a head shell concerning an embodiment of the present invention.

Embodiments according to the present invention will be described below with reference to the drawings. In the drawings, components that are the same or functionally similar are given the same reference numerals unless otherwise specified, and description thereof may be omitted.

FIG. 1 is a perspective view showing a head shell according to an embodiment of the present invention. In the present embodiment, the pickup cartridge 5 and the connector plug 9 are mounted on the main body 1 of the head shell.

The head shell in which the pickup cartridge 5 is mounted will be described based on these drawings. As shown in the drawing, a pickup cartridge 5 having a reproducing needle that traces a sound groove of a record board is attached to a tip portion of the head shell body 1.

The shape of the main body 1 of the head shell is formed by an integrated structure including the plug connecting portion, but it may not be formed or cut out by the integrated structure.

The head shell body 1 is characterized in that it is made of a special plastic having conductivity, which is integrally formed of a high-rigidity polymer composite material under ultrahigh pressure. The conductive special plastic may include, for example, a conductive polycarbonate-based resin, and may be combined with a conductive carbon resin or the like.

By the way, with a plastic material in which an antistatic agent for preventing static electricity has been kneaded, static electricity generated on the surface of a record board cannot be released during record reproduction, which causes noise to occur. Therefore, the main body of the head shell is not formed by kneading an antistatic agent, but is formed by molding a conductive polymer or a conductive polymer composite material under high pressure.

FIG. 2 is a plan view showing the head shell according to the embodiment of the present invention. The body 1 of the head shell is provided with a soft wearing upper absorber 4 on the upper plane of the head shell body above the mounting position of the pickup cartridge 5. The upper absorber 4 is softly attached by the rod-shaped connecting member 6, and it can be seen that the connecting member 6 is not in contact with the main body 1 of the head shell when viewed from above the head shell.

By the way, the upper absorber may soften the connecting member 6 on the upper surface with the spacer 2 interposed. Even in this case, since the upper absorber 4 covers the upper surface of the portion of the head shell body 1 in contact with the connecting member, the head shell body 1 and the connecting member 6 are not in contact with each other. There is no change.

FIG. 3 is an assembly view showing the head shell according to the embodiment of the present invention. First, the structure of the head shell of the present invention will be described in detail with reference to FIG. The head shell of the present invention is a body 1 of the head shell and a vibration absorber that sandwiches the body 1 from above and below in a sandwich form. The lower absorber 3 softly attached to the body 1 of the head shell and the upper absorber 4 softly attached. It has and.

The upper absorber 3 and the lower absorber 4 are each formed with a hole 10 for penetrating the shaft portion of a pair of rod-shaped connecting members 6. The holes 10 are formed with projections each having a convex shape so as to fill a pair of through holes 14 formed for mounting the pickup cartridge 5 provided in the main body of the head shell. The absorber 3 and the upper absorber 4 are fitted in the through holes 14, respectively.

Then, only the absorber comes into contact with the hole wall of the through hole 14 formed in the head shell body, and the rod-shaped shaft portion of the connecting member does not come into direct contact with the hole wall of the through hole 14. That is, it has a structure that does not contact the main body of the head shell at all.

The pickup cartridge 5 is softened only to the upper and lower vibration absorbers through the pair of rod-shaped connecting members 6.
That is, in the pickup cartridge 5, the entire upper surface of the pickup cartridge, which is the mounting surface, is in contact with only the lower absorber 3, and the lower absorber 3 and the upper absorber 4 are connected by the rod-shaped connecting member 6 and the nut 8. It is only softly worn.

Further, the spacer 2 may be interposed above the upper absorber 4 in order to control the attitude of the pickup cartridge 5 to some extent. The spacer has a size smaller than the plane of the upper absorber 4, and does not press the entire upper plane of the upper absorber. Therefore, the lower absorber 3 and the upper absorber 4 do not hinder the vibration that occurs when the vibration propagating from the pickup cartridge 5 is absorbed, and the vibration propagating from the pickup cartridge 5 is released to the upper part, and the main body of the head shell is released. Minimize the effect on 1.

The rod-shaped connecting member 6 that connects the pickup cartridge 5 and the main body 1 of the head shell via the upper absorber 3 and the lower absorber 4 may be a mounting bolt, a screw, or a rod-shaped screw.

Further, when the connecting member 6 is such bolts or screws, it may be used as the connecting member 6 regardless of whether it is a full screw or a half screw.

Next, the structure of the connecting member 6 will be described. The rod-shaped shaft portion of the connecting member 6 is smaller than the diameter of the through hole 14 formed in the main body 1 of the head shell. Further, the head portion of the rod-shaped connecting member 6 forms a softly attached state of the pickup cartridge 5 to the extent that the head portion of the rod-shaped connecting member 6 is substantially the same as or smaller than the diameter of the through hole 14 formed in the body 1 of the head shell. However, it may be larger than the diameter of the through hole 14.

In addition, the rod-shaped shaft portion of the connecting member 6 has a central portion of a convex portion for fitting either or both of the lower absorber 3 and the upper absorber 4 so as to close the hole of the through hole 14. The formed hole 10 is inserted. In this way, the rod-shaped shaft portion of the connecting member 6 is inserted so as not to come into contact with the main body of the head shell, so that the head shell main body, the pickup cartridge 5, and the rod-shaped connecting member 6 are kept in a completely non-contact state. Be drunk This is the same when the spacer 2 is interposed, and the spacer 2 does not come into contact with the main body of the head shell.

Next, the lower absorber 3 and the upper absorber 4 will be described.

The lower absorber 3 and the upper absorber 4 function as a vibration absorber. Both of these absorbers are characterized in that they are molded from a flowable plastic.

By the way, the lower absorber 3 and the upper absorber 4 are molded as a soft and jelly-like fluid synthetic resin so as to absorb the co-vibration at a high level, and are softly attached to the head shell body.

The flowable synthetic resin, which is the flowable plastic, can be molded from, for example, a heat-curable silicone resin, a strongly adhesive polyurethane resin, or the like, but other resin materials such as a conductive resin may be used. It can also be molded from a synthetic resin including an epoxy resin processed into the above. Regarding the degree of softness, a jelly-like or gel-like degree is excellent in resonance, but since the appropriate needle pressure for the record needle differs depending on the type of tone arm and pickup cartridge, it may be as soft as human skin.

The pickup cartridge 5 is only connected to the pair of rod-shaped connecting members 6, and the rod-shaped connecting member 6 contacts only the soft and jelly-shaped lower absorber 3 and the upper absorber 4 as described above. , Softly held to move reasonably.

Further, the pickup cartridge 5 is not adhered or fixed to the lower absorber. For this reason, the pickup cartridge 5 has excellent movability and reduces the direct propagation of vibration to the head shell.

Next, the soft attachment of the head shell body 1, the lower absorber 3 and the upper absorber 4 will be described in detail with reference to FIGS. 3 to 6.

FIG. 4 is a side view of the head shell according to the embodiment of the present invention, and is a side view in a state where a step portion for storing upper and lower absorbers is provided in the head shell body. FIG. 5 is a bottom view of the head shell.

Further, FIG. 6 is a cross-sectional view of the head shell body shown in FIG. 1 as seen from the front, and shows a state in which a step portion for storing upper and lower absorbers is provided in the head shell body. There is.

As shown in FIG. 3, a mounting surface 11 of the pickup cartridge for softly attaching the lower absorber 3 is provided on the front portion of the bottom surface of the head shell body 1. The softening space of the lower absorber 3 formed on the mounting surface 11 of the pickup cartridge has a uniform size with the lower absorber 3.

The soft-adhesion space of the lower absorber 3 formed on the mounting surface 11 of the pickup cartridge may be larger than the lower absorber 3.

In this regard, the main body 1 of the head shell softly attaches a lower absorber larger than the upper softening surface of the pickup cartridge main body in order to completely absorb the vibration of the pickup cartridge 5.

That is, in order to softly attach the lower absorber, the lower absorber 3 is first softly attached to the mounting surface 11 of the pickup cartridge included in the main body 1 of the head shell, and the pickup cartridge 5 is inserted through the absorber. The head shell body 1 is attached (softened) so as not to touch it directly.

FIG. 6 shows a case where the main body 1 of the head shell is provided with upper and lower step portions 12 for accommodating the lower absorber 3 and the upper absorber 4, respectively.
6 is a cross-sectional view showing a state in which the lower absorber 3 and the upper absorber 4 are stored in the upper and lower step portions 12 of the main body 1 of the head shell, and the filled portions are The lower absorber 3 and the upper absorber 4 are shown.

That is, the mounting surface 11 of the pickup cartridge included in the main body 1 of the head shell may be provided with a step portion 12 for storing the lower absorber. Also in this case, the stepped portion is provided with the pair of through holes 14 in the stepped portion, completely covers the upper surface soft-adhesion surface of the pickup cartridge body and the lower absorber, and is not completely separated from the pickup cartridge body. The shape is a contact.

Further, as shown in FIG. 6, a step portion 12 for accommodating the upper absorber may be provided on a portion of the main body of the head shell which is an upper flat surface and where the upper absorber is softly attached. Also in this case, the step portion has the pair of through holes 14 in the step portion so as to completely cover the upper absorber and not to contact the connecting member 6 at all.

In this case, the lower absorber 3 is stored in the head shell so that the softening surface of the lower absorber 3 on the head shell side contacts with the step portion 12. Further, the upper absorber 4 is stored in the head shell in such a manner that the softening surface of the upper absorber 4 on the head shell side is in contact with the head absorber.

Then, as shown in FIG. 4, when the lower absorber 3 and the upper absorber 4 are softly attached in the stepped portion 12 respectively, even if both absorbers are softly attached, the thickness of the main body of the head shell deviates. In addition, the total weight of the absorber and head shell body is light, and it is thin and can exhibit sufficient vibration absorption capacity.

The head shell according to the present invention has a structure in which the two absorbers of the lower absorber 3 and the upper absorber 4 sandwich the head shell body 1 in a sandwich shape. Since the two absorbers are provided above and below in this manner, each absorber may have a thin shape as compared with a vibration absorber of another head shell having only a single vibration absorber.

As shown in FIG. 5, the lower absorber 3 is formed in a size sufficient to cover the pickup cartridge 5, and is softly attached while at least the soft attachment surface of the pickup cartridge 5 is in contact with the lower absorber. It does not stick out in the state.

That is, the lower absorber 3 has a shape and size that covers the entire upper surface soft-adhesion surface of the pickup cartridge 5, and its area is larger than the upper surface soft-adhesion surface of the pickup cartridge 5. Even if the upper surface of the pickup cartridge 5 has the same shape and size as the upper surface, the upper surface of the pickup cartridge 5 is in contact with only the lower absorber 3, and the head shell body 1 is It may be in a completely non-contact state.

As shown in FIGS. 5 and 6, the nuts 8 used in the pair of the connecting members 6 are inserted into the mounting grooves 13 formed on both side surfaces of the pickup cartridge 5 through which mounting bolts are inserted. The tip of the mounting shaft portion and the bottom surface of the pickup cartridge 5 are supported in a supported state. In this mounting method, the pickup cartridge 5 is not firmly fixed, and a slight play is generated so that a softly attached state is achieved, and the pickup cartridge is not affected by vibration generated when the turntable rotates. 5 itself acts as a cushion to reduce vibration.

The groove 13 may be a hole type instead of the groove type.

By the way, as shown in FIGS. 4 and 5, a plug connector 9 connected to the tone arm and paired is provided at the rear end of the head shell body 1. The plug connector 9 is attached by fitting it into a through hole provided in the rear end wall of the head shell body 1.

Next, as shown in FIG. 6, the projections formed so that the upper absorber 3 and the lower absorber 4 are loaded in the shaft insertion holes 14 of the pair of rod-shaped connecting members 6, respectively. 10 are loaded in the through holes 14 formed in the head shell body so as to face each other in the vertical direction. At this time, the plane of the tip of the protrusion of the lower absorber 3 and the plane of the tip of the protrusion of the upper absorber 4 are in contact with each other inside the through hole 14, but may be slightly non-contact.

That is, as shown in FIG. 6, since the shaft portion of the rod-shaped connecting member 6 is inserted into the center of the protrusion 10 provided in the upper and lower absorbers, the absorber wall is formed in the through hole 14 formed in the head shell body. As a result, the pickup cartridge 5 and the rod-shaped connecting member 6 are completely out of contact with the head shell body 1.

By the way, the projection 10 formed in the convex shape formed for loading the upper absorber 3 and the lower absorber 4 into the through-holes 14 for inserting the shaft portions of the pair of rod-shaped connecting members 6 is the upper absorber 3 Alternatively, only one of the lower absorbers 4 may be provided. However, since one of the protrusions contacts all or most of the hole wall of the through hole 14, the shaft portions of the pair of rod-shaped connecting members 6 do not directly contact the hole wall of the through hole 14. Must be achieved.

Further, as shown in FIG. 6, even when the spacer 2 is used, the size of the spacer is smaller than that of the upper absorber 4, and the spacer is in contact with only the upper absorber 4, so the pickup cartridge 5 The non-contact property of the rod-shaped connecting member with respect to the head shell body 1 is ensured.

Here, the effect of each of the above-described embodiments according to the present invention will be described with reference to experimental results.
Referring to FIG. 7, the head shell to which the pickup cartridge is fixed and the head shell body to which the pickup cartridge is softly attached are mounted on the tone arm of the record player, and after the electrical connection is made, the record needle is actually recorded. It is a comparison waveform diagram at the time of tracing a carved sound groove.

The tone arm used in this experiment is a standard one, which is equipped with an adjustable balance weight on the rear part and adopts a rotation holding system using a bearing and a pivot.

Humans can perceptually hear sounds of about 20 to 20,000 hertz, and it is said that high-frequency sounds of 8,000 hertz or more activate the brain and have a high healing effect. Classical music, which is generally said to have a healing effect, especially piano concertos contains a lot of high-frequency sounds above 8000 Hz. Such high-frequency sounds are said to be in the musical range that gives a sense of transparency by cleaning the sounds.
Further, it is generally said that sound reproduction by a record has a higher overtone effect than sound reproduction by a CD.

On the other hand, when the vibration generated from the turntable of the record player, the vibration derived from the rattling of the tone arm fitting part of the record player, and their resonance affect the record player, the sound waveform is distorted. It is said that the real sound cannot be faithfully reproduced, especially for high-frequency sound because of the difference from the sound image of the real sound.

The waveform diagram shown in FIG. 7 compares the performance of the head shell from the viewpoint of faithful reproducibility of the actual sound, especially for high-frequency sound, in which the waveform of such sound is distorted.

In the experiment, the same record player and the same audio unit are used.

In this experiment, one of the objects to be compared is one in which a conventional head shell is attached to a tone arm and a record is traced. The conventional head shell is formed by integrally fixing a vibration absorber to the head shell, and the pickup cartridge is also completely fixed.
Further, the pickup cartridge is fixed by a mounting bolt method, but the head of the bolt is in contact with the through hole of the head shell body and a part of the upper plane of the head shell body.
For one of the head shells, a prototype according to the embodiment of the present invention was used.

The music used in the experiment was a record 20AC 1551... Schumann/piano concerto. At the beginning of the song, chords played by the entire orchestra of wind instruments and string instruments are ensembled with vivid high-pitched chords of the piano.
In the experiment, the beginning part of the same song was extracted, record reproduction was performed by a record player and an audio unit in which both head shells were alternately mounted, and the waveform data was collected by a waveform measuring device.

The waveform diagram shown in FIG. 7 is a waveform obtained by sampling the beginning portion of the same music when the record is reproduced using the conventional product.
On the other hand, the waveform diagram displayed in the lower part of the figure is a waveform obtained by sampling the beginning part of the same music when a record is reproduced using a prototype according to the implementation mode of the present invention.

First, the waveform diagram shows the progression of the sound of the music from left to right.
A comparison of both waveforms reveals a certain difference in the first introduction of the song. First, the waveform corresponding to the first chord when the song starts will be described.

In the lower part of the figure, within the frame of the part indicated by the dotted line on the left side, the width of the waveform is narrow at the left tip part of the waveform corresponding to the first chord, and there is no blur. On the other hand, in the waveform in the upper part of the figure, the width of the waveform of the chord corresponding to this is wide, and it can be seen that this is a mixture of surplus and unnecessary sounds with the chord of the actual sound. This is the vibration generated from the so-called record player turntable, etc., the vibration derived from the rattling of the tone arm mating part of the record player, and their resonance, creating unnecessary noise (noise) through the head shell. It is presumed that the electric signal that is transmitted has propagated to the tone arm.

On the other hand, the sound (lower waveform) when the prototype of the present invention is used is clearly different from the conventional product, and almost no waveform showing extra noise is found in the chord at the introduction portion.

Further, the inside of the dotted line frame surrounding the right portion of the lower waveform in the same figure is compared with the waveform of the corresponding portion in the upper waveform in the same figure.

The phoneme in this portion is a high-tone phoneme portion played by the piano in the music, but the waveform at the top of the figure shows a flat waveform.
On the other hand, the waveform shown in the frame of the right dotted line part of the lower waveform in the figure is a waveform that literally undulates. This is presumed to be due to faithful reproduction of sounds with so-called overtone effects, when examined based on acoustics and music theory. In other words, music theory is an empirical rule systematized to create good music. In this theory, a chord that combines high frequency sounds or high frequency phonemes contains a lot of harmonic components, and the sound is clean and transparent. It is said to be a musical range that gives a feeling, and achieves a hypersonic effect.

In this respect, the waveform shown in the frame of the right dotted line part of the lower waveform in the figure indicates that a very delicate overtone effect is achieved. This is achieved not only by the vibration generated from the turntable of the record player of the record, but also by suppressing the resonance caused by the arm being shaken by the minute irregularities of the sound groove on the surface of the record with high absorption power. This is a possible waveform.
On the other hand, as shown by the waveform in the upper part of the figure, in the conventional product in which the vibration absorber is fixed to the head shell and integrally molded, and the pickup cartridge is also completely fixed, the reproduction of these high frequency sounds is obstructed. It should be presumed that the sound was not affected by vibration and resonance, and the reproduced sound was not in a clean state. Therefore, the overtone effect was hindered and the hypersonic effect could not be achieved.

As described above, in a classical music played on a piano, a high frequency band exceeding about 10,000 hertz is generally diversified, but a vibration absorber is fixed to the head shell to be integrally molded, and the pickup cartridge is also fixed completely. It can be seen that the conventional product does not achieve a sufficient phoneme reproduction level and the hypersonic effect is not achieved, while the present invention clearly reproduces the phoneme/pitch more faithfully.

That is, in the head shell according to the present invention, the head shell is sandwiched between the upper and lower absorbers, and the pair of bolts for softly attaching the pickup cartridge is attached not only to the shaft portion but also to the head portion. Since it does not reach the diameter of the pair of through holes provided in the head shell, it does not directly contact the head shell body. Further, since the lower absorber is not fixedly integrated with the head shell, it is hardly pressed even between the pickup cartridge and the head shell mounting surface.

By the way, the fact that the bolt does not contact the head shell body affects the lightness of movement of the pickup cartridge. That is, since the shaft portion and the head portion of the bolt are free from the body of the hard head shell, the pickup cartridge is released from the restraint of the head shell and the tone arm and is held so as to be able to move appropriately.
Therefore, the absorber can absorb the vibration generated when the turntable rotates very highly, while vibrating due to the rattling of the tone arm fitting portion and the material of the tone arm. It is possible to prevent co-vibration and the like caused by the shape and shape from being propagated to the pickup cartridge through the head shell.

In this way, not only the vibration between the pickup cartridge and the head shell but also the vibration transmission from the tone arm is suppressed, and a high-quality phoneme can be reproduced from the recording signal recorded on the record board.

The absorber attached to the head shell is a flexible resin material, for example, a fluid plastic material. This absorber is a separate component from the head shell and can be easily attached and detached. Moreover, the function is not impaired when a general detergent is used like urethane, and it is not deteriorated rapidly when washed, but it can be washed and reused in a normal household. Further, when the performance deteriorates, it is economical because only the absorber needs to be replaced.

Further, this absorber efficiently absorbs and eliminates the vibration from the tone arm, so that the vibration is prevented from being transmitted to the pickup cartridge.

The main body of the head shell employs a special plastic having conductivity, which is formed by integrally molding a high-rigidity polymer composite material under high pressure. As a result, it is possible to prevent the static electricity generated by the vibration generated when the turntable rotates and the static electricity generated by friction when tracing the groove of the record from being absorbed by the absorber. .. That is, in cooperation with the softening absorber, it is possible to dramatically reduce vibration and eliminate the harmful effects of static electricity. Further, it is possible to prevent static electricity generated from vibration caused by rattling of the tone arm fitting portion from accumulating on the surface of the head shell body.

In this way, not only the vibration between the pickup cartridge and the head shell but also the transmission of the vibration from the tone arm is suppressed, the pickup cartridge is flexibly traced against the movement of the groove of the record, and the repulsive force is exerted even in the part with large dynamics. Can be absorbed and traced smoothly. As a result, a high-quality phoneme can be reproduced from the recording signal recorded on the record board.

<Summary>
According to the head shell of this embodiment, for example, the following effects are achieved.

According to the embodiment of the present invention, (1) the vibration transmitted from the tone arm is cut, (2) the resonance of the pickup cartridge is absorbed, (3) the trackability of the sound groove of the record is improved, and (4) To absorb the vibration from the turntable and the repulsive force against the vertical and horizontal movements of the record needle, (4) suppress so-called scratch noise at the bottom of the record groove, and (5) eliminate the adverse effects of static electricity acting on the head shell. As a result, it is possible to flexibly respond to a sound source with intense dynamics and reproduce a high-quality phoneme from the recording signal recorded on the record board. As a result, the sound quality is improved and the separation feeling of the musical instrument is improved.

<Modification>
Next, a modified example according to the present embodiment will be described.

As shown in FIG. 8, in the head shell according to the present invention, the head shell includes an intermediate plate 15 between the upper soft mounting surface of the pickup cartridge 5 softly mounted on the lower absorber 3 and the lower absorber. May be interposed.

In this case, the upper surface soft-adhesion surface of the pickup cartridge may exceed an appropriate degree of soft-adhesion with respect to the sizes of the head shell and the lower absorber. For example, when the upper plane of the pickup cartridge used in combination with the head shell has an area smaller than the average size of commercially available pickup cartridges, it is unnecessarily necessary to softly attach the lower absorber 3 to the lower absorber 3. It may sway.
The intermediate plate 15 stabilizes the soft attachment when the stability is lacking when the needle is placed in the groove of the record for reproduction.

In addition, since the intermediate plate 15 has different design styles in the functional parts of the pickup cartridge depending on the product, the appropriate stylus pressure is different depending on the product (generally, the stylus pressure is 1.5 g to 2 g in the moving magnet type). On the other hand, in the moving coil type, it is desirable that the pickup cartridge is softly attached within the range of the stylus pressure of 3 g to 3.5 g). In such a case, by interposing the intermediate plate 15 between the pickup cartridge and the lower absorber, the stability of the pickup cartridge is increased, and the softness of the lower absorber and the needle pressure of various pickup cartridges are adjusted. The role to play can be expected.

That is, the intermediate plate is a plate-shaped member made of a hard plastic resin. Further, the shape and size thereof are substantially the same as the shape and size of the upper plane of an average commercially available pickup cartridge, and the contact surface is completely covered by the lower absorber.

However, the intermediate plate 15 is in contact only with the upper contact surfaces of the connecting member 6 and the pickup cartridge 5 and the lower absorber 3.
Therefore, even if the intermediate plate 15 is interposed, the main body 1 of the head shell directly contacts only the lower absorber 3 and the upper absorber 4, and the main body 1 of the head shell and the main absorber 1 are in contact with each other. There is no change in that the non-contact property of the pickup cartridge 5 is secured.

Although the present invention has been described with reference to specific examples according to the preferred embodiments of the present invention, these specific examples are possible without departing from the broad scope and scope of the present invention defined in the claims. Obviously, various modifications and changes can be made to the example.
That is, the present invention should not be construed as being limited by the details of the specific examples and the accompanying drawings.

1 Main body of head shell 2 Spacer 3 Lower absorber 4 Upper absorber 5 Pickup cartridge 6 Connecting member 8 Nut 9 Connector plug 10 hole
11 Mounting Surface 12 Step 13 Groove 14 Through Hole 15 Intermediate Plate

Claims (4)

A head shell body having a mounting surface to which the pickup cartridge is mounted, and a non-mounting surface facing the mounting surface;
An upper absorber located on the upper surface side of the non-attaching surface of the head shell body,
A lower absorber located between the mounting surface of the head shell body and the pickup cartridge,
The pickup cartridge, a mounting surface and a non-mounting surface of the head shell body, a rod-shaped connecting member that is inserted into a pair of through holes respectively provided in the upper absorber and the lower absorber, and connects these
The head shell, wherein a diameter of a pair of through holes provided on the mounting surface and the non-mounting surface of the head shell body is larger than a diameter of the fixing member and is not in contact with the connecting member. The head shell according to claim 1, wherein a diameter of a pair of through holes provided in the lower absorber is substantially equal to a diameter of the fixing member. The head shell according to claim 1, wherein the absorber is a jelly-like or gel-like fluid plastic. The head shell according to any one of claims 1 to 3, wherein a main body of the head shell is a special plastic having conductivity, which is integrally formed by molding a high-rigidity polymer composite material under an ultrahigh pressure.

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