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JPS5251903

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DESCRIPTION JPS5251903
October 23, 1975 Secretary General of the Patent Office Hideo Saito Shiidoushi 1; u, a [l] child of
the name of the invention [1] child (2) 1 drawing (3) application form 1 copy [phase] Japan
Patent Office 0 Japanese Sho 52-519030 published Japanese Sho 52. (1977) 4.26 Internal
reference number 乙 7172 J ゝ specification 1, name of the invention 1, vibrator of the name of
the invention pickup
(1) 1 statement
3. Detailed Description of the Invention The present invention relates to the improvement of the
transducer of a pickup for reproducing a record. The purpose is to improve the high frequency
characteristics. FIGS. 1 to 8 illustrate conventional vibrators, and (11 to (8) show the respective
cantilevers. (9) to .sigma.0 are vibrating elements fixed to the rear ends of the cantilevers (1) to
(8), and are driven by the vibrations of the cantilevers (1) to (8). The micromotion elements (9) to
αQ are various members such as magnets, coils (including reels), high permeability materials
(mu materials, mu pipes), electrodes as capacitors, light shutters, etc. according to the type of
pickup. Although all medical devices are used, connection portions with the cantilevers (1) to (8)
are bonded with an adhesive such as an epoxy resin (the two are adhered. What is shown in FIG.
1 is one in which the cantilever (1) and the vibrating element (9) are bonded at the bonding
surface CD, but this bonding portion e]) does not surround the entire circumference, Since the
step portion 63) becomes weak, the cylinder frequency characteristic is not good. Although FIG.
2 (two shown) inserted and fixed the pipe-shaped cantilever (the vibrator 00 at the rear end of
the pipe 21), the length of the joint portion 0 was not sufficient. The one shown in FIG. 8 is one
in which the cantilever (3) and the vibrating element συ are connected by the joint pipe α
force, but two bonded parts 3 and e 4) are formed. FIG. 4 (The one shown here uses a mu-vibe as
the vibrating element @, but again, good results can not be obtained if the length of the bonding
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portion e1 is not sufficient. Fig. 5 (The one shown here uses a magnet as the vibrating element
(i3), and its center Q, EndPage: 1 ") installed" '° hole 9 ° "yf L // <-(5) (7) Attach the back end of
the adhesive 5. However, if the size of the hole is increased, the volume of the magnet decreases
and the output decreases. Only small holes can be drilled, and the amount of insertion of the
cantilever (5) is also limited by the thickness of the magnet. The area of the bonding part eQ can
not be increased, and the strength of the part is insufficient. Fig. 6 (The one shown in this figure
is the one between the magnet as the vibrating element (14) and the cantilever (6) (this vibration
α is interposed between the magnet and the cantilever (6 In addition to the disadvantages of (g,
adhesion gc'7) c 2 occur in two places (this occurs. Fig. 7 (This figure shows a vibrating element
(a face Q of le, adhesive scoop (19) of a flange member adhered 00), but the bonded part
between the metal fitting (19) and the cantilever (7) The same problem as described above
occurs at θ9).
What is shown in FIG. 8 is to fix the cantilever (8) through the vibrating element (i 61 G, the pipe
eO bonded and inserted and bonded), but this also has two bonding portions e]) e'zt It does not
differ much from what is shown in FIG. By the way, in the conventional 2-channel stereo
reproduction Q2, 29 Ki (it was enough to reproduce the frequency of z or less, but even if Fig. 14
(this is shown, the frequency characteristic of this Q may cause distortion). This is, for example, a
CD-4 record (if it is required to reproduce the eyebrow near the H2Q 5QK, H2 and so on, the
waves in Fig. 15 and Fig. 16 tend to occur. As shown in Fig. 17G, as shown in Fig. 17G, it is
possible to use one with the same specifications, such as one with the higher frequency of
multiple peaks and one with the higher frequency. Even if the characteristics (this variation
occurs. Although the variation in the above characteristics causes inconvenience in reproduction
of the CD-4 record, it has been conventionally considered that the cause is the lack of strength of
the cantilever. Therefore, in order to improve it, G, Only the strength improvement of the
cantilever has been taken into consideration, such as tapering the cantilever, or using a hard and
light material such as beryllium or carbon fiber. However, as a result of the research of the
present inventor, the cause of the variation in the above-mentioned characteristics has been
found to be another. As long as the strength of the cantilever is manufactured to the same
specification, it can not be considered that the double Q also changes. したがつ′−き1、お7.
よう、、、ワ1.1 14 。 It is not thought that a 3 □ 5 ° 9 or 8 will be produced.
However, the conventional vibrators shown in FIGS. 1 to 8 (in this case, each has an adhesive
portion, and the fitting accuracy of the adhesive portion has a variation of about 5 to 50 μ.
Therefore, the thickness of the adhesive which intervenes there has a variation of 10 times. The
Young's modulus of the epoxy resin considered to be the most appropriate adhesive is 3.2 ×
10′ζ (2 to the adhesive layer, because the Young's modulus of aluminum which is a material of
cantilever) is 7 × 105 yen. The strength of is not more than 1/20 G of the cantilever. Since two
Q soft layers intervene and their thickness deviation is as much as 10 times, it is natural that the
above-mentioned variations in characteristics occur. The present inventor considered the
following three as a method of effectively increasing the strength of the bonded portion based on
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L occurrence and Kf. (1) Use of a hard adhesive.
(2) Increase in bonding area. (3) Decrease in stress on the bonded part. However, at the present
time, since there is no epoxy resin or more and a hard material suitable as an adhesive, the above
(1) can not be satisfied. The present invention solves the above two problems (2) and (3) at once,
and FIG. 18 shows its principle. The vibrator A is obtained by inserting and bonding the vibration
element 60 to the rear end of the pipe-shaped cantilever 641 and has the same size (twice as
large as the 2 ° of the vibrator 2 configured as above). The amount of insertion of the vibrating
element 6 button d into the cantilever θ ◇ a is the same (in this case, both 171 and ■ 2).
Therefore, the area of the bonding portion of the transducer A is twice that of the transducer B.
Further, when force F is applied under the same conditions of the tips Q of the cantilevers 0164
of both of the movers A and B, the moment generated by the bonded portion Q by this Q is the
same, and the bonded portion of the vibrator A is the center point e0 The shear force acting on
the bonded portion of the vibrator A is 1/2 of that of the vibrator B, since the distance from the
point is twice that of the vibrator B. As a result, the contact EndPage: 2 attachment portion of the
transducer A has an effective strength 4 times that of the attachment portion of the transducer B.
From the above results, it can be understood that the larger the diameter of the bonding part, the
better it is. However, in practice, this is limited by the moment of inertia of the whole vibration
system. Therefore, it is necessary for the cantilever to be in the form of a pipe and to thin the tip.
Cone like this (conventional cantilevers have been used, but conventional ones have been
considered in order to uniformly distribute the strength of the cantilever from the tip to the base)
Therefore, for example, it has a taper of the order of minimum diameter O4 ++ to maximum
diameter 06 (not too small. However, in the present invention (in this case, a sufficient effect can
not be obtained unless the ratio of the minimum diameter to the maximum diameter is doubled
or more. In addition, since the diameter of the vibrating element must be increased as a result of
rubbing the diameter of the base of the cantilever, the length of the vibrating element must be
shortened in order to suppress its mass increase. When the fM dynamic rope is regarded as a
cylinder, the length is shorter than the diameter, and the result of the chewing is obtained. Each
example of this invention which considered in the above is shown. Fig. 9 [This figure shows a
vibrating element @ a step section, and this G-cone-shaped cantilever six back-end large-diameter
sections are fitted and bonded, and the diameter of the large-diameter section Is about 25 times
the diameter of the small diameter portion, and the diameter of the vibrating element @ is about
15 times the thickness (sixths).
Fig. 1O (This figure shows the large diameter portion Q of the cantilever 60 and the vibration
element Q1 inserted and adhered, and Fig. 9 (The figure shows two vibration elements Q having
the same diameter as the one shown in this figure and having a large diameter An adhesive part
is obtained. Fig. 11 (This figure shows that the cantilever is formed in a step shape with four
parts of 6969 @ 9) 606υ, and the step of the vibration element [email protected] 嵌合 is fitted and bonded.
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Since a large number of bonded parts are produced, the result is not so good. In FIG. 12, the rear
end of the cone-shaped cantilever @ 0) is a vibrating element @ with a vibrating element @ made
of a vibrating element, and is inserted and adhered. The end part is spread like a trumpet-like
scale and the vibrating element @OG is joined. Is characterized in that the vibration element
whose length is greater than the length is bonded and fixed (it can be supported even if there is a
bonding portion inside) at least at the outer periphery of the base of the cantilever. The strength
of the bonding portion between the element and the cantilever can be sufficiently increased (2),
and the moment of inertia of the vibrator can be suppressed. Therefore, improvement and
variation of high frequency characteristics can be reduced.
4. Brief Description of the Drawings FIGS. 1 to 8 are side views of the conventional vibrator, and
FIGS. 9 to 13 are side views of the respective embodiments of the present invention. 4 FIGS. 14
to 17 are graphs showing frequency characteristics of the conventional pink-up, and FIG. 18 is an
explanatory view of the principle of the present invention. e ˜ @ υ ... to the cantilever)) ˜ @ ・ ・
・ ... a vibrating element. Figure 1 Figure 2 Figure 3 Figure 4 Figure 7 8 ° EndPage: 3 Figure 16
Figure 17 Figure 18 EndPage: 4
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