JPS61240401A - Stylus structure for pickup cartridge - Google Patents

Abstract

PURPOSE:To attain the orientation of an armature in a proper state to an action gap by forming at least a flat standard surface for attachment to an attachment rod provided at the cantilever side and an attachment hole drilled at the knob member side respectively in order to prevent the relative variance of revolution between said rod and hole. CONSTITUTION:Both armatures 29 and 29 have 45 deg. cross angles to the virtual vertical surface including an axial line of a cantilever 25 and are orientated orthogonally to the axial line of the cantilever 25. A support wire 30 and an attachment rod 31 are formed in a body and concentrically with the axial line of the cantilever 25 at the rear end of a supporter 28. A metallic stopper pipe 32 is unified with the rod 31, and both the rod 31 and an attachment hole 33 have a right triangular form respectively. Thus the relative variance of revolution is avoided by each face of said right triangle. In such a way, the cantilever 25 can be attached quite easily to a knob member 21 without having a special angle control job.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a stereo pickup cartridge that simultaneously reproduces multi-channel signals from two modulation walls of a sound groove engraved on a record.

More particularly, the present invention relates to a needle assembly for a pick-up cartridge having two mutually independent armatures corresponding to each armature.

[Technical background of the invention] Figure 7 shows patent No. 1054256 filed by the present applicant.
A needle assembly for a pickup cartridge, which was patented as Japanese Patent Publication No. 52-3282, is shown. That is, this needle structure includes a knob member 1 which is detachably attached to the bottom of a cartridge body (not shown), and a support body 3 having a needle point 2 at one end and made of synthetic resin at the other end. A cantilever 5 comprising a body 3 and a pair of armatures 4, 4 installed in a substantially V-shape at an angle corresponding to each modulation wall of the sound groove of a record; and the support 3.
and a damper 6 made of an elastic material interposed between the knob member 1 and the support body 3, and a mounting rod 8 is attached to the rear end of the support body 3 via a support line 7.
The knob member 1 has a mounting hole 9 into which the mounting rod 8 is inserted, and by inserting and fixing the mounting rod 8 into the mounting hole 9, the cantilever 5 is attached to the knob member 1. On the other hand, it is supported so as to be able to vibrate with the damper 6 sandwiched therebetween. On the other hand, on the cartridge main body side, as shown in FIG.

An electromagnetic generator is provided which includes two pairs of pole pieces 10, 11 and 12.13 forming independent working gaps on the left and right sides and a coil 14.15 and 16.17 associated with each of these pole pieces. .

By attaching the knob member 1 to the cartridge body, the pair of armatures 4, 4 is guided to a proper position within each working gap formed by the two pairs of pole pieces.

However, since the conventional mounting rod 8 has a perfect cylindrical shape and the mounting hole 9 is a perfectly circular hole with a slightly larger diameter than the conventional mounting rod 8, a relative rotational misalignment is likely to occur between the two. Therefore, the mounting rod 8 is inserted into the mounting hole 9 and the screw 18
Therefore, before fixing the mounting rod 8 in the mounting hole 9, it is necessary to perform the troublesome adjustment work of adjusting the orientation angle of the pair of armatures 4, 4, and an improvement in this respect has been desired. . Incidentally, if the mounting rod 8 is fixed in the mounting hole 9 with rotational deviation, the armatures 4, 4 will not correspond angularly to each modulation wall of the sound groove of the record, resulting in problems such as crosstalk. It causes the occurrence.

[Object of the Invention] This invention was made in view of the above-mentioned drawbacks of the conventional example, and its purpose is to maintain the cantilever relative to the knob member while maintaining each armature at an appropriate angle without requiring any special adjustment work. An object of the present invention is to provide a needle structure for a pickup cartridge which can be attached to a pickup cartridge.

[Examples] Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

As shown in FIG. 1, this needle structure includes a knob member 21 made of synthetic resin that is detachably attached to the bottom of a cartridge body (not shown). The knob member 21 includes a bottom wall portion 22 and a pair of left and right side wall portions 2 formed to engage with the side surfaces of the cartridge body at both ends of the bottom wall portion 22 while creating appropriate friction.
3.23, and approximately in the center of the bottom wall portion 22 is a plug member 24 that defines the mounting position of this knob member 21 in cooperation with a socket (not shown) provided on the cartridge body side, and a cantilever 25. 26 supporting capitals that support
is provided protrudingly. A needle tip 27 is attached to one end of the cantilever 25 in a known manner, and a support 28 formed of poured resin is integrally provided at the other end. In this case, as illustrated in FIG. 2, the other end of the cantilever 25 is closed flat by a press or the like, thereby preventing the molded resin from flowing into the cantilever 25, and 28 and the cantilever 25 are prevented from rotating relative to each other.

A pair of columnar armatures 29, 29, which are oriented in a substantially V-shape at an angle corresponding to each modulation wall of a sound groove of a record (not shown), are implanted in the support body 28, as in the prior art. That is, taking a 45-45 system record as an example, each armature 29, 29 has an intersection angle of 45 degrees with respect to a virtual vertical plane that includes the axis of the cantilever 25, and They will be orthogonally oriented. Further, according to this embodiment, a support line 3 is provided at the rear end of the support body 28.
0 and the mounting rod 31 are integrally molded coaxially with respect to the axis of the cantilever 25, and the mounting rod 3
A metal stopper pipe 32 is integrally attached to 1. By inserting this stopper pipe 32 into the molding die in advance, it can be integrally fixed to the mounting rod 31 as shown in Figure 5.

On the other hand, in the present invention, the support portion 26 of the knob member 21 is provided with a mounting hole 33 having a shape that matches the mounting rod 31.

The pair of armatures 29 and 29 are attached to the mounting rod 31 and the mounting hole 33 in cooperation with each other when the mounting rod 31 and the mounting hole 33 are fitted together.
at least one flat mounting reference for mounting the cantilever 25 without causing rotational displacement relative to the knob member 21 such that the cantilever 25 intersects at an equal angle with an imaginary vertical plane containing the axis of the cantilever 25; Each surface is formed. In other words, according to this embodiment, as shown in FIG. 3, the mounting rod 31 and the mounting hole 33 are formed in an equilateral triangular shape to prevent relative rotational displacement on each surface thereof. In addition, the cantilever 25 can be attached to the knob member 21 very easily without requiring any special angle adjustment work.

Incidentally, as illustrated in FIGS. 4 and 5, the mounting rod 31 and the mounting hole 33 may be trapezoidal or semicylindrical. In short, as described above, at least one
All you need is one flat mounting reference surface.

The cantilever 25 is attached to the knob member 21 by inserting the mounting rod 31 into the mounting hole 33 with a damper 34 formed in an annular shape made of butyl rubber, for example, interposed between the cantilever 25 and the support portion 26. However, in this embodiment, the mounting rod 3I can be fixed in the mounting hole 33 without using fixing devices such as screws or fine pins. That is, referring also to FIG. 6, an elastically deformable locking claw 35 is provided in the mounting hole 33 and is inclined toward the center of the hole at a predetermined angle along the insertion direction of the mounting rod 31. ing. On the other hand, the mounting rod 31 is formed with a notch 36 that engages with the locking pawl 35 at a predetermined insertion position, so that the mounting rod 31 is forced into the mounting hole 33. When the locking pawl 35 is once pushed down by the head of the mounting rod 31 and passes over the head, it engages with the notch 36, so that the mounting rod 31 is inserted into the mounting hole 33. It will be firmly fixed. In this case, a predetermined tensile force is applied to the support wire 30 at the fixed position, and the damper 34
It is necessary to select the position of the notch 36 so that an appropriate compressive stress is applied to the notch 36.

Note that reference numeral 37 is a hole for a mold pin that forms the locking hole 35.

[Effects] As is clear from the description of the embodiments described above, according to the present invention, the mounting rod connected to the cantilever side and the mounting hole drilled in the knob member side are arranged relative to each other. At least one flat mounting reference surface is formed on each of the cantilevers to prevent rotational misalignment, so the pair of armatures provided on the cantilever can be moved by simply inserting the mounting rod into the mounting hole. It can be oriented in an appropriate state with respect to the operating gap on the side of the cartridge body, improving productivity and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing one embodiment of the needle assembly for a pickup cartridge according to the present invention, FIG. 2 is an exploded cross-sectional view of the main part of the same needle assembly, and FIG. 4 and 5 are cross-sectional views similar to FIG. 3 showing other modifications,
Figure 6 is a plan view taken from line A-A in Figure 2;
The figure is an exploded perspective view showing a conventional needle structure, and FIG. 8 is a schematic perspective view showing a combined state of an electromagnetic generator provided on the cartridge side and an armature provided on the cantilever side. In the figure, 21 is a knob member, 25 is a cantilever, 26
28 is a support, 29 is an armature, 30 is a support wire, 31 is a mounting rod, 33 is a mounting hole, 34 is a damper, 35 is a locking pawl, and 36 is a notch. Patent applicant Audio Technica Co., Ltd. Agent Patent attorney Takuya Ohara Figure 1 Figure 2 Figure 3 Figure 7 Figure 1

Claims (1)

[Scope of Claims] A knob member detachably attached to the bottom of a cartridge body having an electromagnetic generator, and a support body having a needle tip at one end and made of synthetic resin at the other end, the support body a cantilever comprising a pair of columnar armatures planted in a substantially V-shape at an angle corresponding to each modulation wall of the sound groove of a record; and an elastic member interposed between the support body and the knob member. a damper made of material, a mounting rod is connected to the rear end of the support via a support wire, and a mounting hole into which the rod is inserted is bored in the knob member. By inserting and fixing the mounting rod into the mounting hole, the cantilever is supported so as to be able to vibrate with respect to the knob member, and when the knob member is mounted on the cartridge body, the pair of In a needle assembly for a pick-up cartridge in which a cylindrical armature is guided to a proper position within an operating gap formed at the bottom of the cartridge body, the mounting rod and the mounting hole cooperate with each other when fitting together. flat mounting reference surfaces for mounting the cantilever to the knob member are formed such that the pair of columnar armatures intersect at equal angles to an imaginary vertical plane containing the axis of the cantilever; A needle structure for a pickup cartridge characterized by: