JPS6334396Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a pick-up cartridge, and more particularly to a pick-up cartridge having a moving coil transducer.

FIG. 1 shows a typical conventional moving coil type pickup cartridge. That is, this cartridge includes a permanent magnet 2 having a pair of magnetic pole pieces 1, 1 forming a magnetic gap, a cantilever 3 having a needle tip at its tip, and a coil 4 attached to the rear end of the cantilever 3. It also includes a moving coil transducer 6 consisting of a needle structure 5 elastically supported on one side of one magnetic pole so that the coil 4 can vibrate within the magnetic gap. This moving coil converter 6 is attached to a support body 7 made of synthetic resin, and the coil 4 is connected to a terminal pin 1 which is passed through a terminal plate 9 at the rear part of this support body 7 via a lead wire 8.
0 and is electrically connected to 0. In this case, the terminal plate 9 is made as a separate component in advance and is bonded to the support body 7 with an adhesive or the like during the assembly process, which requires more man-hours and is an issue in increasing mass productivity. This has become a hindrance. Further, since both the support body 7 and the terminal plate 9 are made of synthetic resin, there is a high possibility that so-called sink marks may occur during cooling after molding, resulting in deformation. Furthermore, in terms of physical properties, synthetic resin has a slow sound speed, so it cannot effectively release (or eliminate) minute vibrations from a phono motor, etc. transmitted via a tone arm or head shell, which has a negative impact on the vibration system mentioned above. This includes the problem of having negative effects. On the other hand, since a relatively long lead wire 8 is routed between the coil 4 and the terminal pin 10, breakage is likely to occur during wiring, and there is also a risk of noise contamination due to the resonance phenomenon of the lead wire 8. There is.

It is therefore an object of this invention to provide a pick-up cartridge with an improved support capable of overcoming the various disadvantages mentioned above.

Hereinafter, this invention will be described in detail with reference to embodiments shown in the accompanying drawings. In this embodiment, the same parts as those in FIG. 1 are given the same reference numerals.

As shown in FIGS. 2-4, this pick-up cartridge includes a moving coil transducer 6 similar to that described in the description associated with FIG. 1, but in this case: The moving coil transducer 6 is adapted to be mounted on a support 11 made of ceramic material. This support 11 is the fifth
As illustrated in the figure and FIG. 6, it consists of a solid ceramic block formed into a prismatic shape,
This block has four through holes 12 through which four terminal pins 10 are preferably press fit.
is drilled. That is, in this invention, a terminal plate is integrally molded on the support body 11, unlike the conventional example. Further, on the surface of this support 11, print patterns 18 are formed by metallization from each part of the through hole 12 to a position close to the coil 4. In addition, the printed pattern 18 and the terminal pin 10
The electrical connection may be made by soldering or by crimping. In supporting the moving coil transducer 6, the support body 11 in this embodiment has a tapered support surface 13 formed so as to give a predetermined inclination to the moving coil transducer 6.
and a mounting hole 14 bored perpendicular to the tapered surface 13. A metal sleeve (not shown) having a female screw hole (not shown) is fitted into the mounting hole 14, and after the moving coil converter 6 is placed along the tapered support surface 13, the female screw hole of the metal sleeve is inserted from the front. It is firmly fixed to the support body 11 by a long male screw 15 screwed into the support body 11. Each of the coil lead wires 16 directly drawn out from the coil 4 is soldered to the end of the printed pattern 18 that is formed from the terminal pin 10 to a position near the coil 4 as described above. . It should be noted that a main body case (not shown) can be broken around the support body 11 to which the moving coil transducer 6 is attached as described above. Further, the reference numeral 17 attached to FIGS. 2 and 5 indicates the support 11.
This is a mounting hole for a head shell (not shown) drilled in the.

As is clear from the description of the embodiments described above, this invention is based on a support body 11 made of a highly insulating ceramic material and including a terminal portion through which a terminal pin 10 is passed.
It is characterized by being integrally molded. Therefore, compared to the conventional method in which the support body and the terminal board are made separately from synthetic resin and then joined together using adhesive, etc., it is easier to manufacture, and the structure can be made more compact. be able to. In this case, even if the support 11 is made thick (block-like) as shown in the figure, sink marks and the like will not occur unlike synthetic resin. Furthermore, the support body 11 has
Since a metallized printed pattern 18 is formed from the terminal pin 10 to a position near the coil 4, it is only necessary to solder the lead wire 16 from the coil 4 to the end of the printed pattern 18. As a result, wiring work becomes easier, and noise generation due to resonance of the lead wires can be prevented as much as possible. On the other hand, in terms of physical properties, ceramic materials have a higher Young's modulus than metals (e.g. aluminum 7.4×10 ¹¹ dyne/cm ² , magnesium 4.5×10 ¹¹ dyne/cm ² , ceramic 48.4×
10 ¹¹ dyne/cm ² ), and the speed of sound is high (e.g.
Aluminum 2.7×10 ¹¹ dyne.cm/g, Magnesium 2.6×10 ¹¹ dyne・cm/g, Ceramic 12.1×
10 ¹¹ dyne cm/g), it is suitable as an acoustic material, and can effectively miss (extinguish) minute vibrations from a phono motor, etc. transmitted via a tone arm or headshell without causing a phase delay. , the moving coil transducer 6 is
There is little risk of adversely affecting the vibration system.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventional example, FIG. 2 is a perspective view showing an embodiment of this invention, and FIG. 3 is a side view.
4 is a front view, FIG. 5 is a front view of the support used in FIG. 1, and FIG. 6 is a sectional view taken along the line A--A. In the figure, 1 is a magnetic pole piece, 2 is a permanent magnet, 3 is a cantilever, 4 is a moving coil, 5 is a needle structure, 6 is a moving coil converter, 10 is a terminal pin, 11 is a support body, 16 is a lead wire, 18 is the print pattern.

Claims (1)

[Claims for Utility Model Registration] A movable coil converter comprising a permanent magnet having a pair of magnetic pole pieces forming a magnetic gap, and a needle structure including a coil disposed so as to be able to vibrate within the magnetic gap. The pick-up cartridge has a support body formed by integrally molding a support part for supporting the moving coil converter and a terminal part to which a terminal pin is attached from a ceramic material, and
A metallized printed pattern is formed on the surface of the support from the terminal pin to a position near the coil, and the lead wire drawn out from the coil is electrically connected to the terminal pin through the printed pattern. A pick-up cart cartridge characterized by being connected to.