JPS587456Y2 - headshell - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a head shell that is attached to the tip of a tone arm of a record player.

First, an example of the shape of a conventional herad shell will be explained with reference to FIGS. installed.

Further, the head shell 1 is attached to the tip of the tone arm 4 by a lock cylinder 5 at one end of the head shell 1 on the side of the vertical wall 1b.

Note that 6 in the figure is a finger.

However, in general, in a frequency range where the displacement applied to the stylus tip is close to direct current, the head shell 1 can be regarded as a rigid body, so the head shell 1 moves completely as one with the tone arm 4, but at high frequencies. Then, the head shell 1 is no longer a rigid body, but causes natural vibration as an elastic body, and in particular, as shown in the schematic diagram of FIG. 2, the head shell 1 bends vertically and vibrates at the horizontal wall 1a portion.

Note that this is due to the fact that the support path from the needle tip to the tone arm support portion 1 is elongated in a downward U-shape.

FIGS. 3 to 5 show the shapes of conventional herad shells designed to correct the bending vibrations of the horizontal wall 1a as described above.

In this case, the head shell 1 has a U-shaped cross section, and the horizontal wall 1a and the vertical wall 1b are integrally connected to each other by a pair of left and right side walls 1c.

According to the herad shell 1 having the above-mentioned shape, the bending vibration of the horizontal wall 1a portion as described above can be eliminated, but the bending vibration of the both side walls 1c portion as shown in FIG. As shown, some torsional vibration centered around the mounting portion of the cartridge 3 remains, which is insufficient.

When the head shell 1 vibrates as described above, it not only imparts a modulation component to the sound quality but also the mid-range and high-pitched sounds, resulting in a truly unclear sound quality, which is undesirable as it significantly reduces the commercial value.

The present invention was devised to correct the above-mentioned defects, and the present invention has been devised to correct the above-mentioned defects.
At least one pair of screws are attached to the side wall of the head shell so as to be substantially opposed to each other, and these pair of screws press both sides of the cartridge attached to the head shell.

With this configuration, the rigidity of the head shell is significantly strengthened, and very good sound quality can be obtained.

An embodiment of the present invention will be described below with reference to FIGS. 6 to 8. Similar to the second conventional example described above, this head shell 11 has a substantially U-shaped cross section, and has a horizontal wall 11a. ,
The vertical wall 11b is integrally connected to each other by a pair of left and right side walls 11c.

And the cartridge 13 with the needle 12 is mounted on the horizontal wall 11a
The head shell 11 is screwed to the lower surface of the head shell 1 by a pair of regular screws 14, and the head shell 11 is attached to the vertical wall 1ib side of the arm 1.
A lock cylinder 16 is attached to the tip of the lock cylinder 5.

Note that 17 in the figure is a finger.

Therefore, in the herad shell 11 of the present invention, a pair of screw holes (tap holes) 18 are formed at positions offset toward the lower end side of the pair of left and right side walls 11c so as to face each other.

A pair of screws 19 are screwed into both screw holes 18.
It is.

The pair of screws 19 facing each other are screwed into the left and right sides 1 of the cartridge 13.
3a from both sides to clamp and fix the cartridge 13.

At this time, it is preferable to interpose a member 20 such as felt between the tips of the screws 19 and the cartridge 13 to prevent damage to the cartridge 13 due to the tightening of the screws 19.

In addition, it is effective for both screws 19 to suppress and support the outer wall of the cartridge case near the damper support portion, which is the center of movement of the sensing lever of the cartridge 13.

If the cartridge 13 is compressed and supported from both the left and right sides by the pair of screws 19 as described above, the horizontal wall 11a, both side walls 11c, and the pair of screws 19 form a square, as shown in the schematic diagram of FIG. This means that a cross-sectional shape that forms the shape is obtained, and furthermore, the distance between the centers of this cross-section is shortened by the cartridge 13.

Because of this cross-sectional shape, the rigidity of the head shell 11 can be significantly strengthened, and the bending vibration of the side walls 11c can be reduced.
(car) It is possible to prevent the occurrence of torsional vibrations centered around the IJ joint mounting part.

By loosening both screws 19 a little, the set screw 14 can be removed and the cartridge 13 can be easily removed as in the conventional case, so the cartridge 13 can be replaced without any trouble.

As for the material of the head shell 11 of the present invention, for example, aluminum, plastic molded product, magnesium, etc. can be used, just as in the conventional case.

The sprouted screw 19 may be made of either metal or plastic.

As described above, the present invention uses at least one pair of screws to press and support both sides of the cartridge from both sides of the left and right -q side walls of the head shell, which has a rectangular cross section. The rigidity of the head shell can be significantly increased, and vibrations that have traditionally been problematic, such as bending vibrations on both side walls of the head shell and torsional vibrations around the cartridge mounting part, can be completely eliminated, making it possible to completely eliminate vibrations that have traditionally been problematic. You can obtain a vibrating Herad shell.

Therefore, it is possible to prevent deterioration of sound quality due to vibration, and to provide a head shell with very good sound quality and high commercial value.

[Brief explanation of drawings]

Fig. 1 is a side view showing one conventional example, Fig. 2 is a schematic diagram of the same as above, Fig. 3 is a side view showing another conventional example, and Figs. 4 and 5 show vibration generation as above. FIG. 3 is a front view for explanation. FIG. 6 is a side view showing an embodiment of the present invention, FIG. 7 is a cross-sectional view taken along the line ■--■ in FIG. 6, and FIG. 8 is a schematic diagram of the same. In addition, in the symbols used in the drawings, 11 is a helad shell, 11a is a horizontal wall of the head shell, 11b is a vertical wall of the helad shell, 11c is a side wall of the head shell, 13 is a cartridge, 13a is a side surface of the cartridge, and 19 is a screw. It is.

Claims (1)

[Scope of utility model registration request] At least a pair of screws are attached to a pair of left and right side walls of the head shell, which has a substantially U-shaped cross section, with the screws facing each other, and these pairs of screws press both sides of the cartridge attached to the head shell. Stale head shell.