JPH0411202Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tone arm used in a record player.

As is well known, on a record disc (hereinafter simply referred to as a record), sound is recorded as a vibration waveform of the grooves, and when playing this, the vibration waveforms of the grooves are picked up with a stylus and sequentially processed. A pickup or cartridge is used to convert the signal into an electrical signal. This cartridge is configured to react very sensitively to the vibration of the needle and perform the vibration-to-electrical signal conversion described above so that it can faithfully reproduce even signals with a dynamic range or a wide frequency range. ing.

The tone arm of a record player is arranged to support such a cartridge, and its performance is such that the stylus vibrates only in response to the vibration waveform of the record groove.
In addition, the above-mentioned cartridge must also be non-resonant with respect to vibrations so that only the vibrations corresponding to the vibrations of the needle can be effectively extracted.

Capable of absorbing vibrations from the cartridge itself.

is basically required.

If we look at conventional tone arms, although the overall balance and mechanism of the arm has been considerably improved, perhaps because the material is metal, it inevitably resonates with the vibrations of the needle and cartridge. However, the basic performance mentioned above could not be fully fulfilled. Note that if this resonance is extreme, extra vibrations will be applied to the needle, making it impossible for the cartridge to faithfully reproduce a signal corresponding to the original sound.

This idea was made in view of the above circumstances,
It is an object of the present invention to provide a tone arm that can fulfill the above-mentioned basic performance as a tone arm and maximize the performance of a cartridge.

In order to achieve this purpose, this idea focused on the fact that stone has better vibration absorption ability than metal, and is also a material that is less likely to generate resonance as described above. was made of stone. For example, natural marble
It is a material that has 5 to 10 times better ability to absorb vibrations than iron, and if the tone arm is made of this kind of stone, the above-mentioned performance can be achieved satisfactorily. .

As described above, the tone arm according to this invention can maintain a nearly non-resonant state with respect to vibrations, and can also satisfactorily absorb the vibrations of the cartridge itself, thereby improving the performance of the cartridge. You will be able to get the most out of it.

Examples are shown below.

A plan view of an embodiment of the tone arm according to this invention is shown in FIG. 1, and a side view is shown in FIG. 2.

In this embodiment, the arm 10 is made of natural marble and processed into the shape shown in FIGS. 1 and 2, and a group of lead wires (not shown) is housed particularly from the approximate center to the tip. A penetrating hole 11 for holding the arm 10 is provided to form a pipe shape (see FIG. 2), thereby improving the vibration propagation characteristics of the arm 10. Each of the lead wire groups has one end attached to the cartridge 2 which is attached to the tip of the arm 10 through this hole 11.
0 electrical signal output pin (not shown), and each other end is connected to the inside of the record player body (not shown) and electrically connected to the input terminal of an audio circuit consisting of an amplifier etc. . As a result, during actual operation (when playing a record), the vibration waveform of the record groove taken in through the stylus 21 is sequentially converted into a corresponding electric signal by the cartridge 20 and input to the audio circuit, and the vibration waveform It is pronounced as a musical tone corresponding to The cartridge 20 and the arm handle 13 are fixed to the tip of the arm 10 with a screw 12.

Further, in this embodiment, the screw 30 serves as a fulcrum for attaching the arm 10 to the record player body, and the arm 10 is a pole (not shown) having a base that fits into a recess 31 at the tip of the screw 30. It is mounted on the record player body via. The arrow in the figure indicates the center of attachment. The above-mentioned pole also has a concave base that engages with the hemisphere 32 and functions as a so-called pole bearing, thereby allowing smooth movement of the arm 10 using the concave portion 31 as a fulcrum. I try to guarantee it. The screw 30 functions as an oil base adjustment screw in this bearing mechanism.

Further, when the arm 10 is attached to the record player main body in this way, a weight 40 is used to balance the front and back of the arm 10, and this weight 40 is fixed to the arm 10 with a screw 41. Further, the screw 42 arranged behind the weight 40 is a stylus force adjustment screw, and the engagement position of this screw 42 with the weight 40 is the recess 31 that serves as the fulcrum for attaching the arm 10 to the record player body. 42 and this screw 42, the pressure of the needle 21 against the record surface is adjusted to be appropriate. Normally, this stylus pressure is kept around 2g.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the tone arm according to this invention, and FIG. 2 is a side view of the tone arm of the same embodiment. 10...Tone arm, 11...Hole, 12...
Cartridge installation screw, 13...Arm handle, 2
0... Cartridge, 21... Needle, 30... Oil base adjustment screw, 32... Hemisphere, 40...
Weight, 41... Weight installation screw, 42... Needle pressure adjustment screw.

Claims (1)

[Claims for Utility Model Registration] A tone arm for a record player that supports a cartridge, characterized in that the tone arm is made of natural marble.