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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a vibration device of a
conventional general MM type cartridge, FIG. 2 is an equivalent circuit diagram of the same
device, FIG. 3 is a side view of a cantilever of the improved technique, FIG. 4 is a side sectional
view of the vibration device of the present invention, FIG. 5 is its equivalent circuit diagram, FIG.
6, FIG. 1 and FIG. 8 are graphs of frequency characteristics, and FIG. 9 is another embodiment of
the present invention. Side sectional view of FIG. 20 ииииии Vibrator, 21 иииииии Support и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и ? .... Material
with stiffness viscosity resistance. Number of protections (Hz)-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of
the peristaltic system of a moving magnet (MM) type cartridge. As is well known, the vibration
attachment of MM type 1-te '-2' o) tributaries of the general figure 1 support the rod-like magnet
0: I via the damper f 13 to the support ??, The cantilever I is fixed to the magnet Q3 to form a
nine structure. The image pickup device 0 [and the like circuit (I4 can be expressed as shown in
FIG. 2). In the same IJ, Sr is the stiffness determined by the needle tip and the record, III? is the
equivalent mass of the vibration system seen from the needle tip, the viscosity 4 # of the r?
damper, the resistance, and So the stiffness of the damper. And, with this configuration, a
resonance phenomenon occurs under the well promotion wave number which is the smell of
high sound. Here (# vibration frequency, it is fh, formula F formula 1 formula% formula (2) The
frequency patent is not flat like the curve @ il + in the figure 6 and the mechanical impedance
characteristic is also off As shown in curve (1), a peak of resonance occurs, and the needle
pressure has to be increased to prevent the needle skipping in the high range, and the trace on
the light needle shell was in need. The following techniques have been proposed to solve this.
That technology! d, Figure 3 ((divided with two divided cantilevers (x 4. ) (142) In the middle of
pure compliance or viscosity material (insert + 61, frequency characteristics are shown in Figure
10 song # 1? A method is proposed to flatten as in +, and to open the vicinity of the well swing
point of the 4-pole impedance inertia as in the curve и ?) 1 of the tree 7 in FIG. Shi, first skill hit,
split the cantilever 04 into 2) 3) and run b! s Construction is complicated, high assembly
technology is required, and costs are high. Even if these defects are improved, it is limited to the
condition of selection of the optimum formulation such as material specific for insertion,
viscosity resistance, equivalent mass division ratio, etc., even in terms of commercialization. s!
There is a need for J. In addition, cantilevers (141) (142) 1-t, which are light in weight and high
in mechanical strength, are desirable, but the technique of the upper ear is a material as a
different member in the middle of cantilevers (14, 142) (It is not preferable from the viewpoint of
demeritization and mechanical one degree, since IO is added. The purpose of this plan is to
provide a supporting device of a vibration system that can be traced by acupuncture pressure,
squeezing in a wide band and suppressing mechanical impedance at the same time as leaving the
above-mentioned defects f #. Below +41, this invention is demonstrated concretely.
FIG. 4 shows an embodiment of the present invention. Referring to the figure, the vibration
device {circle over (2)} fixes a damper (company) to the support Q1, and via this material (2) a
magnet (2), a material container having an equivalent stiffness S2 and an equivalent viscosity
resistance r2. The fixed end of the cantilever (24) is fixed to the flange (24, K) and the support
1211 K is inserted. It is. The evaluation circuit of the vibration device (2) is as shown in FIG.
?????? In S11, Sr is the stiffness determined by the needle tip and the record, the
equivalent mass of the portion of the WLl cantilever (stock), the town is the equivalent mass of
the magnet, 8? equivalent of the damper, 7 (5) , F, Fi is the equivalent viscous resistance of the
gunper. The general mechanical impedance characteristic of the vibration am of the present
invention can be expressed as a curve (4) of the off view. In the figure, the needle pressure
relaxation (A) (B) (C) is an example of a line for determining the needle pressure necessary to
prevent needle skipping from the frequency characteristic of the cartridge impedance impedance.
Also, the # line portion indicates the area of the needle jump as shown in the lower column of the
figure 7. A flat plate magnet is used here (in the case of the conventional structure, it has a large
number of ? 2 / э 0.3). Therefore, the mechanical impedance characteristics when this ratio is
applied to the present invention to change other circuit constants are shown as an example as an
example. Here, 1 ? (11 (421 i 31 is assumed to be a number ? in the following table) in the
figure. (и) 1, ifj (dy?g и sa, e / B) to f 2 (Y иииииииииииииииии ?9-2 (dyna / ? 1 ?). :::------------9 (-------------------1--knee 1---6 However, other circuit constants are as follows . 8, 2 = 2QXIQ '(dyn4 / x) 8g = 1.2
XIO' ('F-?-] jp 811-From the line of the present invention L% Especially suitable for the
conventional flat magnet type, magnet ( Interposing the material of the circuit ? in order to
obtain the desired mechanical impedance between the edge (24) and the flange (24) of the
cantilever (K), thereby suppressing the peak of the mechanical impedance over a wide band
width. Especially in one. The value of the circuit constant 71 number of the O material-for
example, the value of the stiffness S2 is a function of the thickness t if the Young's modulus and
the shape of the material and the length of the cantilever (2) are determined. Therefore, the value
of the circuit constant is arbitrarily selected in a fairly wide range.
Here, the material (2) is made of, for example, a material of rubber or plastic. In the present
invention, since the light resistance can be made over a wide band, the tracing ability of the
cartridge can be enhanced, the wear of the needle point and the ret groove can be reduced, and
the high fidelity eyelid reproduction over a long time becomes possible. Because it is close to the
vibration support, it has the advantages of rounding near the point of vibration, a small increase
in the amount of value from the needle point, and the simple structure, so that it can be easily
manufactured at low cost.
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