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JPS5036503

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5036503
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a measured waveform of an oscilloscope of a
pulse signal reproduction waveform by a conventional head shell, and FIG. 2 is a front view
showing a state in which a cartridge is attached to an embodiment of the resonanceless head of
this invention. 3 and 4 are side views of FIG. 2, and FIG. 4 is a diagram for explaining the
transmission state of the vibration of the non-resonant Hessian shell, and FIG. 5 is an oscilloscope
of the pulse signal reproduction waveform by the same non-resonant head shell. It is a
measurement waveform figure. 2..... Fig. 1-5-50-36 503 (2) Fig. 3 64----jC "'" "one" 1 <5 Fig. 4 Fig.
5-6-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a common head
shell adapted to absorb abnormal vibration, the head shell having the function of holding the
pickup cartridge in the tone arm mechanism, but the holding of this cartridge In addition to the
functions, the following matters are also required. (-F) The strength of the head shell itself is
appropriate because it must be durable and durable because it always touches the user's hand,
and (b) there is an opportunity to plug in various tone arms. It is desirable that it is within the
range (especially when it is too heavy, needle pressure adjustment may not be possible) (11 (C))
Because it is always in a position to receive the line of sight of a person, (2) the design of the
cartridge is important, and the head shell must have a shape or rigidity that does not generate
resonance (so-called shell noise) in the playing state of the cartridge. And because it is customary
that the conventional hard shell is made of aluminum alloy or hard synthetic resin etc. as the
material of the head shell due to the relationship between strength and weight in the above items
(i) and (ii)). As measures against shell noise mentioned in the section, to increase the rigidity by
bending the aluminum plate material, to cut or cast the cast material of λ aluminum, to increase
the rigidity in the synthetic resin It is narrowed down to eight points of molding the shape. By the
way, the phenomenon referred to as shell noise mentioned above is the case where resonance is
caused by the four natural vibrations of the head shell itself due to the vibration transmitted from
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the mechanical vibration picked up at the needle tip to the head shell through the cartridge. Even
when vibrations of frequencies other than the natural vibration frequency of the shell reach the
head shell (2), the vibrations of the cartridge bounce back to the cartridge again, causing the
cartridge's power generation system to generate an abnormal sound in response thereto. There is
a case. The measures in the previous section apply to the former case), in which the shape is
extremely low in rigidity, using a plate of aluminum, or in which a large number of holes are
provided for weight reduction, or a head of synthetic resin with low rigidity It is noticeable in the
shell etc. Also, in the latter case, it has been confirmed that it occurs in most conventional shell
shells regardless of the former shell squeezing measures-especially the head shell of the head
shell using a thin plate, Even clear reflections can be heard. As the measurement method in this
latter case, a method using waveforms of transient characteristics and attenuation characteristics
at the time of tracing the reproduced sound or pulse signal in the silent groove trace is suitable.
FIG. 1 is a diagram of attenuation characteristics of a pulse signal reproduction waveform by a
conventional hard shell, which is a dotted line l in FIG. It is shown that the white noise of the
preamp and the surface noise of the record board are superimposed on the reflected sound from
the head shell (8) in the waveform of the portion surrounded by. When playing back a record
using a head shell with such a shell reflection sound, the noise is particularly annoying, and it
becomes an all-or-nothing "roughness" sound, so it is easy to feel the abnormality. Therefore, a
good reproduction sound can not be obtained. This device is regarded as the above-mentioned
betting point, and the shell shell is formed into a cylindrical shape so as to form a mechanical
closed circuit, and the vibration from the cartridge is transmitted to the mechanical closed circuit
to generate the generation of shell noise. It is an object of the present invention to provide a nonresonance head shell capable of preventing and dissipating reflection vibration to obtain a
pleasing reproduced sound. Hereinafter, one embodiment of the present invention will be
described based on the drawings. FIG. 2 is a front view showing the cartridge attached to the
resonanceless ladder shell of the present invention, and FIG. 8 is a side view thereof. In both FIG.
2 and FIG. 8, reference numeral (4) 2 is a head shell. This head shell 2 is made of aluminum in
the illustrated embodiment, but it is essential The material is not limited to aluminum, and hard
synthetic resin can also be used. The head shell 2 is formed in a rectangular tube shape so as to
form a mechanically closed circuit 3 with a peripheral wall, and the upper end surface of the
cartridge 4 is in contact with the lower end surface 2 B of the head shell 2. The cartridge 4 is
fixed to the lower end surface 2BK of the head shell 2 by the screws 5 and the plate-like nut 6. As
apparent from this, the cartridge 4 is attached to the lower end surface 2BK of the head shell 2,
but is not fixed to the upper end surface 2 and has a space between the upper end surface 2 and
the lower end surface 2B. It has become. Note that a 7Fi reproduction needle is shown, and 8 is a
cantilever. By the way, as described above, when the cartridge 4 is attached to the head shell 2
and the record playing is performed in a state of care, the reproducing needle 7 slides on the
sound groove 9a of the record (5) 9 as shown in FIG. In the contact state s, the vibration
(longitudinal wave vibration) causing the shell squealing is the reproduction needle 7-cannareva
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8-damper (shown) -car /? Transmit to the mA trig 4 in the direction of arrow 10. Then, this
vibration is transmitted from the cartridge 4 to the mechanical closed circuit 8 of the head shell
2. At this time, in FIG. 4, the vibration transmitted through the left side of the mechanical closed
circuit 3 is transmitted through the right side It branches into vibration (2) and transmits in the
direction of the arrow in the figure.
The two vibrations cross at the center line of the upper end face of the two shells, but the
shortest distance between the vibrations arriving at any point on this center line is equal and the
common distance V in the cartridge 4 Since the vibrations {circle over (1)} and {circle over (2)}
branched due to the vibration are in the same phase, the vibration V is canceled on the center
line of the two upper end faces. Therefore, the vibration {circle over (4)} is not reflected again to
the cartridge 4 to cause shell noise 9 and there is no deterioration of the reproduced sound. FIG.
5 is an actual measurement diagram of the attenuation characteristics during pulse signal
reproduction when using the non-resonant Hedon-Ell of this invention with a reproduction wave
(6) type oscilloscope, where the dotted line 11 in the figure is the white noise of the preamplifier.
And the surface noise of the record board 9, and as is apparent from comparison between this
FIG. 5 and the waveform reproduced by the conventional head shell (FIG. 1), shell noise is
eliminated in FIG. It turns out that In both FIGS. 1 and 6, the vertical sensitivity is '15 mv / Cm,
and the sweep rate is 1/3 QQ see / em. As described above, according to the present invention,
the K-rad shell is formed in a square tube shape so as to form a mechanical closed circuit, and
the force = tritches are attached to the lower end face thereof. It is possible to prevent generation
of abnormal vibration and hence shell squeezing, without causing repulsion toward the cartridge
rather than the vibrating plate, since it is made to divide into mutually closed circuits and cancel
each other. Good reproduced sound can be obtained.
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