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JPS4930121

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DESCRIPTION JPS4930121
■ Pick-up for phonograph 47-7089 ■ Japanese Patent Application No. 43-38969 [Phase]
Application No. 43 (1968) June 6 Priority claim [Phase] June 7th 1967 @ @ United States
0644333 @ inventor Mikel Evans Mila, Indianapolis, Indiana, North Carolina, Illinois 4235 @ JM
Jr. Earl Seenie Corporation, New York, New York 10020 New York Rockefeller Plaza 30 [phase]
Attorney Attorney Attorney in Water
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a bottom perspective view of a pickup for a
gramophone according to the present invention. FIG. 2 is a partial cross-sectional side view of the
pickup for a gramophone shown in FIG.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pickup for a
phonograph, and in particular to an improvement in its construction. The current phonograph
pick-up includes, as one example, one or more mechanical devices such as a piezoelectric device
housed in a support case, or an electrical converter. This case is designed to be fixed to the pick
up arm. A rod-like piece is attached to this case, and at its free end, it matches the sound groove
of the record disc rotating on the turntable (the molded numbering is fixed. Means are provided
within the pickup for mechanically coupling the rod to the piezoelectric device. As a result, a
numbered movement that tracks the asperities of the sound groove is transmitted to the
piezoelectric device, and changes in its characteristics are sensed and converted into electrical
signals. [111111] In order to prevent wear of the material constituting the recording board, it is
necessary that the numbered effective moving mass be as small as possible, and the compliance
of the rod to which it is attached be as high as possible. Furthermore, in order to faithfully
reproduce the recorded voice of the finally generated electrical signal, a mechanical structure
consisting of numbering, a bar, and a piezoelectric device is machined within the range of voice
frequencies recorded on the record board. It is necessary not to cause the dynamic resonance. If
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the voltage device is directly coupled at or near the numbered attachment end of the rod, the
stiffness of the device is directly transferred to the numbering to increase its effective mass and
reduce its compliance to a lower level of the record disc. Cause wear. Conversely, if the piezoelectric device is coupled to a position close to the support end of the rod-like piece away from
the numbered attachment end, various mechanical resonances occur and the output signal from
the pickup is reduced. In practice, it is possible to connect the rod to the piezoelectric device at
an intermediate position apart from both the numbered mounting end of the rod and its support
end, specifically speaking, the length of the rod is .quadrature. It is desirable that the ratio of the
distance L2 between the attachment end and the bonding point of the piezoelectric crystal is 2 or
more. Although it is easy to keep the length precisely, it is difficult to keep the distance L2
accurate because the point at which the rod-like piece is bonded to the piezoelectric crystal
changes from pickup to pickup within the normal manufacturing error range. is there. As the
ratio L1 / L2 changes, the pickup's compliance and output change, thus causing non-uniformity
in its performance. According to the invention, a phonograph pick-up of the type having a pickup case for supporting a mechanical / electrical converter comprises an elongated numbered
support rod for supporting a numbering near one end thereof. A portion of a predetermined
length from the rear end of the support rod is inserted into an aperture drilled with the
predetermined length in an elastic member supported by a support structure (a holding member)
held on the case. ing.
A means for coupling the movement of the numbered support rod to the mechanical-electrical
converter at a position away from the support rod upper numbered attachment end is [111111]
EndPage: part of the means is the surface of the elastic member for holding the upper two
support rods. It is provided to be in pressure contact with the The invention will now be
described in detail with reference to the accompanying drawings. One embodiment of the present
invention shown in FIG. 1 is a phonograph pickup of a type which is suitably mounted on a
pickup arm of a record sound groove and used for three-dimensional sound reproduction. The
pickup has a substantially rectangular case 10. This case comprises two opposing resin castings
forming an internal void 12 extending in the longitudinal direction, and a pair of piezoelectric
transducers 14 and 16 are disposed in the void. At the bottom of the case 10, a rectangular hole
18 communicating with the air gap 12 is provided in the vicinity of the front end thereof, in
which a yoke member 20 is disposed (described later). A recess 22 extends from the rectangular
cavity 18 along the bottom of the case 10, and the recess 22 substantially intersects the recess
24 extending across the bottom of the case 10 at its midpoint. As shown in FIG. 1 (the portion of
the recessed groove 22 between the hole 18 and the lateral recessed groove 24 is the remaining
portion so as to accommodate the shoulder portion of the holding portion 26 of the numbered
structure as described later) Narrow and shallow. The numbering structure includes three axially
arranged members, ie, a numbered support rod 28 having a pair of numberings disposed
opposite to each other near one end, and a cylindrical damping member 30 made of an elastic
material such as rubber. It is believed that the holding member 26 may be a cast resin piece. The
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holding member 26 is arranged in the recessed groove 22 so as to be able to rotate 180 degrees
around an axis substantially parallel to the main axis of the numbered holding structure. The
holding member 26 is manually rotated by means of a forceps arm 32 projecting outwardly
therefrom in a plane perpendicular to the main axis of the case. In particular, as shown in FIG. 2
(the holding member 26 has a dowel shaped projection 34 at its front end, which is inserted into
a fitting hole 36 formed at the rear of the damping member 30) The rear end opposite to the
numbered mounting end 28 is inserted into another second fitting hole 38 formed in the front of
the damping member 30. The second fitting hole extends a predetermined distance into the
damping material such that the numbered support rod 28 fits a predetermined length from the
rear end. The non-perforated part of the central part of the damping material 30 also has a
constant dimension and provides the pivotal support of the numbered support bar. In other
words, the damping member 30 has a first portion to which a predetermined length of the
numbered support rod 28 is attached, a central second portion on which the numbered support
rod is pivotally supported during movement of the cartridge [111111], and the holding member
26. And a third portion fitted to the more projecting dowel-like projection 34.
The resiliency of this damping material is primarily due to the substantial damping of the rear
end of the support bar and the damping of the mechanical resonances which occur in the system
during the operation of the pickup. At the end of the holding member 26 opposite to the
damping material 30, there is a single cylinder @@ 010114. The conversion elements 14 and 15
have rectangular cross sections and are mounted in the case by a known method, and the
respective main surfaces are in mutually perpendicular planes forming an angle of 45 ° with the
vertical plane including the long axis of the pickup case 10 respectively. It is arranged as it is.
The yoke member 20 is made of an elastic material, and has a pair of open legs each having an
opening 46 and 48 for inserting the exposed end of each conversion element 14 and 160, and a
numbered support rod as shown in detail in FIG. And a central recess 50 for inserting the The leg
is axially strong but flexible in the direction perpendicular to the axis. Thus, an axial force or
vibration imparted to one of the legs is transmitted to the associated transducer element to
create a bending moment in the transducer element. An appropriate electrical connection (not
shown) between the conversion element and an appropriate terminal located on the back of the
cartridge for connection to an external preamplifier input circuit. )されている。 The numbered
support rod assembly is positioned in the case 10 such that the bearing surface 44 of the holding
member 26 is aligned with the alignment surface of the recessed groove 22 so that the
numbered support rod assembly can rotate about an axis. The front portion of the holding
member 26 is in contact with a shoulder formed at a narrow point of the recessed groove 22,
and the arm 32 is fitted in any one of the transverse recessed grooves 24. As shown in the figure
(numbering support rods 28 support the numbering support so that the surface of the yoke
member contacts the front end face of the damping member 30, and one of the numberings is
engaged with the recording sound groove. At one point along the length of the rod 28, the
central recessed groove 5o of the yoke member 2o is fitted. In other words, the front end face of
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the damping material is in contact with the facing surface of the yoke member control unit. In
this way, the length L2 of the numbered support rod from the connecting position with the yoke
to the rear end becomes τ constant, which is of course equal to the length of the support rod
portion inserted into the front opening of the damping member 30. [111111] EndPage: 2 The
holding member 26 is crimped in the axially recessed groove 22 by a plate spring 54 fixed to the
bottom of the case 10 with a weir or screw 56. The hook or screw 56 also serves as a means for
fixing the upper and lower portions of the case 10 complementarily to fix the whole structure to
the mounting frame 58, and the free end of the spring 54 forms a clasp to expose the holding
member 26. It aligns with and crawls on one of the flat surfaces 40, 42 so that the holding
portion 26 can be pressed so as not to come off from the recessed groove 22, and at the same
time, it can be rotated between the clasps.
In this example, the spring 54 is made of metal with sufficient elasticity, and can be pressed and
bent by the holding member 26 when it rotates, but it is strongly held so that the holding
member 26 never comes off from the recessed groove 22 It maintains power. Since the length L2
of the support rod inserted into the front of the damping member 30 is always constant, it does
not change between the numbered assemblies. If the ratio of the length □ of the support rod 28
to the yoke member and the length L2 from the back to the end is selected for a specific pickup
design, this ratio can be easily maintained. And can be maintained substantially constant for each
pickup. The surface of the central recessed groove 50 of the yoke coupling member should
always be in close contact with the front end face of the damping member 30 to keep the ratio L
□ / L2 constant. When positioned in the pickup case at an angle such that the yoke member is
substantially perpendicular to the axis of the support bar, the yoke member may be slightly
pressed against the front of the damping material to ensure this. When it is necessary to change
the numbered structure in the pickup according to the present invention, if the ratio L1 / L2 is
made substantially unchanged by connecting to the yoke member at a position along the
numbered support rod of the replacement structure and its support rod, It is clear that
substantially the same performance as that of the above structure is guaranteed.
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